記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

DOI： https://doi.org/10.2118/217325-MS

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1021/acsomega.3c04615

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1016/j.est.2023.107679

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

A method for reducing power peak is to store hydrogen (H2) underground in depleted gas reservoirs (hereafter UHS). In contrast to alternative solutions, like salt caverns or aquifers, the availability of depleted gas reservoirs gives a greater storage capacity. But choosing the right gas field for the UHS and carrying it out are tricky. As a result, the goal of this work is to characterize the UHS in the chosen field and rank Japanese gas fields for it.
To begin with, we ranked and screened potential H2 storage locations in Japan using the Analytical Hierarchy Process (AHP). The best locations for UHS, according to our calculations using the AHP approach, are Sekihara, Kumoide, Katakai, Nakajo, Kubiki, Shiunji, Iwafune-oki (gas), and Minami-Nagaoka. These fields’ high flow capacity, depth, current reservoir pressure, and dip angle are the causes of their elevated position. Then, based on a volumetric reservoir, we studied the H2 injection, storage, and withdrawal capacity at the chosen site in the Niigata Prefecture using the CMG reservoir simulator.
For the first time in Japan, this work offers a framework for evaluating and ranking potential depleted gas reservoirs as a UHS option. It also includes a reservoir simulation study to comprehend the impact of various parameters such as hysteresis trapping, number of injection and withdrawal cycles, and type of cushion gas on the efficiency of H2 storage and withdrawal in a volumetric gas reservoir.

DOI： https://doi.org/10.2118/216987-MS

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1016/j.ijhydene.2022.12.108

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

DOI： https://doi.org/10.2118/210694-MS

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

DOI： https://doi.org/10.2118/210696-MS

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1007/s13202-022-01569-z

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

DOI： https://doi.org/10.3997/2214-4609.202210546

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1016/j.petrol.2022.110187

リポジトリ公開URL： http://hdl.handle.net/2324/4785198

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.3390/en15072344

リポジトリ公開URL： http://hdl.handle.net/2324/4785194

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.3390/gases2010001

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.3390/methane1010003

リポジトリ公開URL： http://hdl.handle.net/2324/4785191

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1080/01932691.2021.1974873

リポジトリ公開URL： http://hdl.handle.net/2324/4785197

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1038/s41598-021-96503-4

リポジトリ公開URL： http://hdl.handle.net/2324/4705310

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1038/s41598-020-73931-2

記述言語：英語   掲載種別：研究論文（学術雑誌）  

CO2 microbubbles have recently been used in enhanced oil recovery for blocking the high permeability zone in heterogeneous reservoirs. Microbubbles are colloidal gas aphrons stabilized by thick shells of polymer and surfactant. The stability of CO2 microbubbles plays an important role in improving the performance of enhanced oil recovery. In this study, a new class of design of experiment (DOE)—definitive screening design (DSD) was employed to investigate the effect of five quantitative parameters: xanthan gum polymer concentration, sodium dodecyl sulfate surfactant concentration, salinity, stirring time, and stirring rate. This is a three-level design that required only 11 experimental runs. The results suggest that DSD successfully evaluated how various parameters contribute to CO2 microbubble stability. The definitive screening design revealed a polynomial regression model has ability to estimate the main effect factor, two-factor interactions and pure-quadratic effect of factors with high determination coefficients for its smaller number of experiments compared to traditional design of experiment approach. The experimental results showed that the stability depend primarily on xanthan gum polymer concentration. It was also found that the stability of CO2 microbubbles increases at a higher sodium dodecyl sulfate surfactant concentration and stirring rate, but decreases with increasing salinity. In addition, several interactions are presented to be significant including the polymer–salinity interaction, surfactant–salinity interaction and stirring rate–salinity interaction.

DOI： https://doi.org/10.3390/colloids4020026

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.3390/su12114603

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.3390/en13102430

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.jngse.2020.103208

リポジトリ公開URL： http://hdl.handle.net/2324/4354920

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s13202-020-00852-1

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Carbon dioxide (CO₂) capture, utilization, and storage (CCUS) have been proposed as a possible technique to mitigate climate change. In this vein, CO₂ storage through enhanced oil recovery (EOR) in depleted hydrocarbon reservoirs is touted as a most effective approach because it synergistically increases oil production and enables permanent sequestration into the reservoirs. However, the construction of a reasonable 3D geological model for this storage reservoir is a major challenge. Thus, this study presents an efficient workflow for constructing an accurate geological model for the evaluation of CO₂ storage capacity in a fractured basement reservoir in the Cuu Long Basin, Vietnam. Artificial neural network (ANN) has been used to predict porosity and permeability values through seismic attributes and well log data. The predicted values were selected using high correlation factors with well log data. Subsequently, the Sequential Gaussian Simulation and co-kriging methods were applied to generate a 3D static geological model by using azimuth and dip parameters. Finally, drill stem test matching was performed to validate the accuracy of the porosity and permeability models through dynamic simulation. A validation 3D reservoir model, which integrates geophysical, geological, and engineering data from fractured basement formation in Cuu Long Basin, was further constructed to calculate theoretical CO₂ storage capacity. As a result, the calculated storage capacity for the fractured basement reservoir ranged from 7.02 to 99.5 million metric tons. These estimated results demonstrate that fractured basement reservoir has a combined potential for CO₂ storage and EOR in the Cuu Long Basin.

DOI： 10.1016/j.ijggc.2019.102826

リポジトリ公開URL： http://hdl.handle.net/2324/4354919

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1007/s13202-019-0680-3

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.3390/min9050274

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1080/15567036.2019.1604865

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1038/s41598-019-41004-8

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.petrol.2018.08.005

リポジトリ公開URL： http://hdl.handle.net/2324/1937165

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1080/10916466.2018.1496102

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： http://dx.doi.org/10.1504/IJPE.2018.093164

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1080/10916466.2018.1463253

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3923/jeasci.2018.4104.4112

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.4172/2157-7463.1000329

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.4236/ojg.2017.75042

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s13202-013-0095-5

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

DOI： 10.2118/169629-MS

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s00203-014-0972-4

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s13202-013-0085-7

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1080/10916466.2011.615365

リポジトリ公開URL： http://hdl.handle.net/2324/4354918

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： http://dx.doi.org/10.1016/j.ibiod.2012.10.003

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.tust.2012.06.009

リポジトリ公開URL： http://hdl.handle.net/2324/4354912

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.jngse.2012.01.011

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

Application of Membrane Separation Method to Concentrate Products on the Process Producing Environmentally Adaptable Deicer by means of Wet Oxidation of Organic Wastes, Y.SUGAI, J.FANGMING, H.ENOMOTO and T.MORIYA, RESOURCES PROCESSING, Vol.51、No.3、148－157, 2004

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Laboratory Investigation of Polymer Producer TU-15A for MEOR Field Tests, Y.SUGAI, A.KISHITA, C.X.HONG, H.ENOMOTO, T.CHIDA and S.C.ZHOU, SPE Asia Pacific Oil and Gas Conference and Exhibition, SPE54381, 1999

出版者・発行元：Journal of Energy Storage  

Underground hydrogen (H2) storage in depleted oil and gas reservoirs is a viable option to address supply-demand mismatches in the renewable energy sector. Depleted reservoirs, however, offer challenges when injection of H2 is of concern. One of the most important areas that need to be addressed is the biochemical reactions that can occur when H2 is introduced into the reservoir. Within oil and gas reservoirs, hydrocarbon-degrading organisms are ubiquitous, with some exhibiting the capacity to utilize H2 as a source of energy. By affecting H2 availability, causing corrosion, altering the reservoir's fluid and geological properties, and contributing to biofilm formation, these bacteria can reduce storage efficiency. Hence, prior to the conversion of a depleted reservoir into a H2 storage site, it is imperative to thoroughly characterize the reservoir's microbiome and investigate its impact on H2 recovery. Consequently, it is recommended to undertake an integrated study of bioreactions spanning from laboratory scale investigation to reservoir scale simulations calibrated by experimental data. In the first part of this paper, we discuss six main groups of microorganisms and their sub-categories that can be active during underground H2 storage, highlighting their properties. Each sub-category proposes suitable candidates that can be used for laboratory studies of underground H2 storage. In the second part, we have a review of mathematical models capable of describing microbial growth in porous media and how to couple them with fluid flow in porous media. Finally, we elaborate on how to calculate and extract the experimental coefficients required to calibrate the models to consider the effect of microbial growth on the reservoir scale. This study's workflow could crosslink the microbiological and reservoir-engineering aspects of underground H2 storage.

DOI： 10.1016/j.est.2025.115519

Scopus

出版者・発行元：Geomechanics and Geophysics for Geo-Energy and Geo-Resources  

Abandoned coal mine goaf is affected by air leakages and prone to spontaneous combustion, resulting in environmental pollution and geological disasters. Haizhou Open-pit Mine adopts both underground and open-pit mining methods. During the long-term mining process, the original stable stratum structure is constantly destroyed, and the slope slides, increasing cracks and severe air leakage around the goaf and roadway. The spontaneous combustion of coal is particularly prominent after the mine shut down. At present, there is no suitable indirect monitoring method to effectively explore the spontaneous combustion area in goaf. The study developed an all-weather monitoring plan and conducted multi-point continuous long-term measurements of the spontaneous combustion state in one abandoned coal mine goaf located in the eastern part of the Haizhou Open-pit Mine. We evaluated the dynamic correlation between surface CO2 flux (SCF) and changes in the underground fire areas, determined the scope and evolution trend of the fire areas, and identified the distribution and change laws of SCF. The results show a significant positive correlation between SCF and soil temperature; moreover, the SCF value was found to reflect the CO2 emission intensity of the goaf. The high SCF in the test area showed month-wise expansion and increase, while the CO2 emission gradually increased monthly, and the calculated annual total emission was approximately 7017 t. Hence, the study can further provide guidance for the monitoring of spontaneous combustion in shallow coal seams, goaf and the assessment of CO2 emissions from underground coal fires through the on-site monitoring and analysis results.

DOI： 10.1007/s40948-024-00867-6

Web of Science

Scopus

出版者・発行元：Current Applied Physics  

Doping is one of the effective strategies to modulate the optoelectronic properties and photocatalytic activity of photocatalysts. In this study, the effect of Fe doping (0–10 %) on morphology, optical and electronic properties, and photocatalytic activity of ZnO nanostructures is studied. The X-ray diffraction analysis shows that >5 % Fe doping, ZnFe2O4 is segregated as a secondary phase. The crystalline size decreases from 50.8 nm to 21.4 nm and the micro-strain increases with increasing the Fe concentration. The Fe doping-induced electronic restructuring facilitates visible light absorption through the O 2p → Fe 3d transition and the suppression of charge recombination by efficiently trapping conduction band electrons. Density functional theory (DFT) calculations are employed to unravel the underlying electronic changes induced by Fe doping in ZnO. The formation of shallow donor levels below the conduction band originates from the Fe 3d state. Photoluminescence spectra of pristine and Fe-doped ZnO nanostructures show characteristic emission peaks at approximately 384 nm and 570 nm, indicating the recombination of free excitons and oxygen interstitial defects, respectively. The results of the photocatalytic activity tests confirm that the 1 % Fe-doped ZnO nanostructures can exhibit the highest efficiency compared to the heavily doped ZnO nanostructures. The high efficiency in photocatalytic activity of 1 % Fe-doped ZnO nanostructures is ascribed to the modulated electronic structure and defect density. The adsorption affinity of methylene blue and water molecules to the surfaces of pristine and Fe-doped ZnO is simulated using the Monte-Carlo method. This study emphasizes the importance of controlling the dopant concentration to enhance the photocatalytic activity of various photocatalysts.

DOI： 10.1016/j.cap.2024.07.009

Web of Science

Scopus

記述言語：日本語   出版者・発行元：一般社団法人 資源・素材学会  

DOI： 10.2473/journalofmmij.mmij-2023-024

CiNii Research

出版者・発行元：Energy Reports  

Geological storage of carbon dioxide (CO2) is a promising technique to reduce large-scale greenhouse gas emissions. There are some candidates for geological storage formation while deep saline aquifers have attracted tremendous attention because they have the largest potential of all possible subsurface storage sites. CO2 injected into deep saline aquifers migrates upward until it reaches a sealing formation due to its buoyancy effect, which causes poor storage efficiency. Over the past few years, some novel research has been published to utilize nanoparticles for CO2 geological storage. The addition of nanoparticles to injecting super-critical CO2 (scCO2) changes its physical properties, such as the density and viscosity, which could mitigate gravity segregation and viscous fingering. However, the studies related to these techniques are still extremely limited, and the potential advantages or their impacts are poorly understood. In this paper, we investigated the effects of the physical properties of scCO2 containing nanoparticles on storage efficiency by using a versatile commercial simulator (CMG-GEM). In particular, the effects of nanoparticle types (aluminum oxide, silicon dioxide, titanium oxide, and zinc oxide) and concentration on CO2 storage efficiency were presented quantitatively by considering possible operation scenarios. The results showed the migration of CO2 to the upper part of the aquifer was suppressed, and the storage of CO2 in the lower part of the aquifer was promoted when scCO2 was injected with nanoparticles. It also showed some effects in delaying breakthrough time and mitigating breakthrough amount when we assumed the pressure control well. It was indicated that the cumulative breakthrough amount after 30 years was reduced by 8.2% in the minimum case and by 79.3% in the maximum case. Although the proposed method still has economic challenges, the innovation in the production processes of nanoparticles or combining with added value will lead to improving feasibility.

DOI： 10.1016/j.egyr.2024.05.009

Web of Science

Scopus

記述言語：英語   出版者・発行元：Scientific Reports  

Biosurfactants, as microbial bioproducts, have significant potential in the field of microbial enhanced oil recovery (MEOR). Biosurfactants are microbial bioproducts with the potential to reduce the interfacial tension (IFT) between crude oil and water, thus enhancing oil recovery. This study aims to investigate the production and characterization of biosurfactants and evaluate their effectiveness in increasing oil recovery. Pseudoxanthomonas taiwanensis was cultured on SMSS medium to produce biosurfactants. Crude oil was found to be the most effective carbon source for biosurfactant production. The biosurfactants exhibited comparable activity to sodium dodecyl sulfate (SDS) at a concentration of 400 ppm in reducing IFT. It was characterized as glycolipids, showing stability in emulsions at high temperatures (up to 120 °C), pH levels ranging from 3 to 9, and NaCl concentrations up to 10% (w/v). Response surface methodology revealed the optimized conditions for the most stable biosurfactants (pH 7, temperature of 40 °C, and salinity of 2%), resulting in an EI24 value of 64.45%. Experimental evaluations included sand pack column and core flooding studies, which demonstrated additional oil recovery of 36.04% and 12.92%, respectively. These results indicate the potential application of P. taiwanensis biosurfactants as sustainable and environmentally friendly approaches to enhance oil recovery in MEOR processes.

DOI： 10.1038/s41598-024-61096-1

Web of Science

Scopus

PubMed

記述言語：英語  

DOI： 10.1021/acsomega.3c08317

Web of Science

PubMed

記述言語：英語   出版者・発行元：ACS Omega  

An optical sensing approach that balances portability with cost efficiency has been designed for the reliable monitoring of fugitive methane (CH4) emissions. Employing a LiTaO3-based pyroelectric detector integrated with micro-electro-mechanical systems and a broad infrared source, the developed gas sensor adeptly measured CH4 concentrations with a low limit of detection of about 5.6 ppmv and showed rapid response times with t90 consistently under 3 s. Notably, the novelty of our method lies in its precise control and reduction of CH4 levels, enhanced by wavelet denoising. This technique, optimized through meticulous grid search, effectively mitigated noise interference noticeable at CH4 levels below 10 ppmv. Postdenoising, nonlinear regression analyses based on the modified Beer-Lambert equation returned R2 values of 0.985 and 0.982 for the training and validation sets, respectively. In conclusion, this gas sensor has been shown to be able to meet the requirements for early warning of CH4 leakage on the surface in various carbon capture, utilization, and storage projects such as enhanced oil or gas recovery projects using CO2 injection.

DOI： 10.1021/acsomega.3c09769

Web of Science

Scopus

PubMed

記述言語：英語   出版者・発行元：公益社団法人 日本金属学会  

Increasing global temperatures due to high atmospheric carbon dioxide (CO2) concentrations may cause an imbalance in the carbon circulation on earth. It has been reported that CO2 emissions from natural soils in all terrestrial areas on Earth account for about 25% of atmospheric CO2 emissions in the global carbon cycle. A tendency is well known that the higher the soil temperature with the higher the metabolic activity of microorganisms in the soil. Furthermore, since the global soil CO2 emissions are huge amount that approximately seven times the total atmospheric CO2 emissions from human origin, it is necessary to investigate the increasing rate of soil CO2 emission rate per unit area and unit time on a global scale (global soil CO2 efflux) that is affected by soil temperature rise due to global warming expected in the coming decades. In this paper, we modeled soil CO2 efflux vs. diurnal and seasonal variation in soil temperature at a measurement point using a formula that is an exponential function of soil temperature and then evaluated the effect of increasing average soil temperature due to surface air temperature rise by global warming. We have proposed a method to analogically evaluate the potential of increasing the rate of soil CO2 efflux against a change of 1°C in soil temperature based on the model equation. The power index b (°C11) just indicates the potential of increasing the rate of soil CO2 efflux to soil temperature rise in any land area with different soil temperatures on earth. Finally, the values of b were obtained from the published literature with field measurement data at 71 locations in 10 countries including our data measured at the Ito campus, Kyushu University. The average rate of potential increase in soil CO2 efflux is 0.10°C11 regardless of vegetation, annual rainfall (precipitation), soil type, and soil components (carbon and nitrogen content). In conclusion, assuming the average soil temperature rises by 1°C and ignoring any effects reducing soil CO2 reduction due to global warming, the potential increase in annual global soil CO2 efflux is roughly estimated at 22 billion tons-CO2/year.

DOI： 10.2320/matertrans.m-m2024801

Web of Science

Scopus

CiNii Research

出版者・発行元：Journal of Energy Storage  

To achieve the net-zero target, hydrogen (H2) will emerge as an essential cornerstone within the energy supply chain of the future. To effectively attain such a target for an integrated and sustainable large-volume economy based on H2 on a global scale, proper H2 storage is imperative. This is where the significance of Underground H2 Storage comes to the fore. However, there are many concerns that should be addressed before using underground structures including the interactions between rock, H2, and liquid within the pore spaces. In this study, we simulated the process of an H2 bubble hitting reservoir rock samples and measured the contact angles for rock–H2–distilled water systems using the Navier–Stokes equations for mass and momentum conservation. The phase-field method was utilized for tracking the free surface. Since the phase-field method is essentially a coupling set of equations, we used the commercial finite element software COMSOL, which excels at solving Multiphysics coupling problems, to solve the Navier–Stokes equations and the phase-field method. The predicted contact angles were validated with the experimental results of basalt, shale, and calcite substrates. The simulated and experimental contact angles differed by <2° in most cases exhibiting favorable agreement. Additionally, the simulation was able to replicate the same behavior of the change in contact angle caused by variations in temperature and pressure during the experiments. It is noteworthy that the findings from this study are helpful to better understand and predict the wettability of different minerals during underground H2 storage.

DOI： 10.1016/j.est.2024.110475

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Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1080/01430750.2024.2315486

出版者・発行元：International Petroleum Technology Conference, IPTC 2024  

Carbon dioxide (CO2) geological storage has a large potential to achieve a net-zero target of CO2 emissions. CO2 injected into the storage formation typically becomes a super-critical state under the underground temperature and pressure conditions. The injected super-critical CO2 (scCO2) tends to migrate upwards within the reservoir due to its lower density compared to the formation brine even though the density of scCO2 is quite higher than that of gaseous phase CO2. Moreover, injected CO2 is affected by not only the gravity segregation but also the viscous fingering. These phenomena are expected to cause poor storage efficiency in carbon storage projects. In this study, we investigated the potential of adding common metal oxide nanoparticles to scCO2 to improve the storage efficiency utilizing the properties of scCO2 as a solvent under subsurface conditions. This paper presents the pseudo-fluid modeling of scCO2 containing nanoparticles and the results of numerical simulation considering the effects of nanoparticle types and concentrations on the CO2 storage efficiency. In particular, the effect of density alteration on CO2 storage efficiency was investigated in this study. Some pseudo-fluid models of scCO2 containing four types of nanoparticles, such as aluminum oxide, silicon dioxide, titanium oxide, and zinc oxide with different concentration were created, respectively. Furthermore, numerical simulations of scCO2 injection with and without nanoparticles were performed using a two-dimensional radially symmetric model. The results from this work showed the migration of CO2 to the upper part of the formation was suppressed and the storage of CO2 in the lower part of the formation was promoted when scCO2 was injected with nanoparticles. Furthermore, CO2 breakthrough time was delayed several months or years and total breakthrough quantities were also decreased as the density and concentration of nanoparticles in scCO2 became higher in the case of installing an imaginary production well for pressure control. These results suggest that the injection of nanoparticle-dispersed CO2 improves the storage efficiency of CO2 geological storage compared to the injection of CO2 alone. Furthermore, this study showed that the concept has possibility of improving the safety of CO2 geological storage, which may play an important role when considering the long-term CO2 sequestration as well.

DOI： 10.2523/IPTC-23852-MS

Scopus

出版者・発行元：International Petroleum Technology Conference, IPTC 2024  

Supercritical CO2 injected into the aquifer in CCS may migrate upward in the aquifer because its density is lower than the density of formation water. As a result, CO2 cannot be stored widely throughout the aquifer, which may reduce CO2 storage efficiency. The objective of this study is to increase the apparent density of supercritical CO2 by dispersing nanoparticles in itself and to improve CO2 storage efficiency by injecting CO2 widely in the aquifers. The n-hexane, which has a similar solubility parameter to supercritical CO2, was used as an alternative solvent to supercritical CO2 in this study. The nanoparticles such as SiO2, Al2O3, TiO2, and ZnO were added and stirred in n-hexane respectively, and their dispersibility was observed after stirring with a magnetic stirrer or ultrasonication for 30 minutes. The dispersibility of nanoparticles in n-hexane was qualitatively evaluated by irradiating the sample with green laser light after stirring and observing the scattered light. The effect of surfactants on improving the dispersibility of nanoparticles was also evaluated using nanoparticles modified with those surfactants. All the nanoparticles were precipitated after 30 minutes of stopping stirring with a magnetic stirrer. The dispersibility of those nanoparticles was improved by ultrasonication and the dispersion was maintained up to about 3 hours. Similar experiments were conducted using nanoparticles modified with surfactants. As a result, improved dispersibility of Al2O3 and ZnO modified with anionic surfactants was obviously observed and laser light scattering was clearly observed for about 2 hours after the stirring was stopped. Finally, it was demonstrated that the dispersion of Al2O3 nanoparticles modified with anionic surfactant was maintained even after 48 hours in n-hexane by ultrasonication. These results indicate that Al2O3 nanoparticles modified with anionic surfactant have high dispersibility in n-hexane, especially with ultrasonication. Anionic surfactants make the surface of nanoparticles hydrophobic, which enhances their dispersibility in nonpolar solvents such as supercritical CO2. Ultrasonication is effective for eliminating agglomeration among nanoparticles and improves their dispersibility in nonpolar solvents.

DOI： 10.2523/IPTC-23962-EA

Scopus

出版者・発行元：International Journal of Ambient Energy  

The adsorption refrigerator system with HFO-1234yf refrigerant (2,3,3,3-tetrafluoropropene) has a global warming potential of less than 4 and activated carbons (MaxsorbIII, MH-00), mesoporous silica (TMPS-2), and metal organic frameworks (MOF-177). We measured the adsorption isotherm under diverse temperature and pressure conditions experimentally, and evaluated the adsorption characteristics of these adsorbents. In this study, we designed an experimental apparatus using a volumetric method and measured the adsorption equilibrium uptake. The MaxsorbIII/HFO-1234yf pair has an adsorption uptake as high as 1.30 g-HFO-1234yf/g-ads at 40 °C and 300 kPa. The adsorption uptake is approximately equivalent to that of the MaxsorbsIII/HFC-134a pair. The experimental data of the adsorption/desorption isotherms show that there is no hysteresis for the studied pair. The experimental results were reproduced using the Dubinin–Astakhov model (D–A model). The D–A model fits the experimental results precisely within 7%. A diagram of the relationship between HFO-1234yf and MaxsorbsIII also generated the D–A model, and the adsorption uptake capacity between the adsorption and desorption steps was obtained as 0.07 kg-HFO-1234yf/kg-ads at 40 and 80 °C. The adsorption capacities of MOF-177, MaxsorbIII, TMPS-2, and MH-00 were evaluated under similar operating conditions to be 0.19, 0.08, 0.11, and −0.03 kg/kg respectively.

DOI： 10.1080/01430750.2024.2315486

Scopus

記述言語：英語   出版者・発行元：ACS Omega  

Understanding the inhibitory factors affecting the adsorption of CO2 on low-rank coal from shallow-depth coal seams is essential to identify potential coal seams for CO2 sequestration. The CO2 adsorption capacity of shallow-depth coals was measured at a low pressure on raw and dry coals. The samples were also prepared for organic analyses, scanning electron microscopy analyses, and low-temperature nitrogen adsorption analyses to evaluate the CO2 adsorption and identify the inhibitory factors. An investigation was conducted to determine how CO2 adsorption occurs on coal by fitting experimental data to adsorption isotherm models, followed by analyzing the results based on the statistical analysis. In addition, this study used Henry's law, surface potential, and Gibbs free energy to identify the adsorption inhibitor between CO2 and coal. The CO2 adsorption experiment was conducted on raw coal with a moisture content of 15.18-20.11% and dry coal with no moisture. The experimental data showed that the CO2 adsorption capacity in dry coal was 1.6-1.8 times greater than that in raw coal. A fitting graph between the adsorption data and the isotherm model indicated that CO2 adsorption on coal occurred on monolayers and multilayers under raw and dry conditions. Statistical evaluation of the adsorption isotherm models showed that the Langmuir and Freundlich models aligned more closely to the experimental data. According to this result, low-pressure adsorption of CO2 on coal occurred in monolayers and multilayers under raw and dry conditions. Coal containing a high huminite content had a higher potential for CO2 adsorption, and the drying increased the positive relationship. On the other hand, coal containing high inertinite content inhibited CO2 adsorption onto the coal, but the drying process did not adversely affect CO2 adsorption. Furthermore, coal with high moisture and inertinite content inhibited the affinity, accommodation, and spontaneous CO2 adsorption onto the coal. CO2 adsorption could lead to swelling, but moisture loss opened more sites and micropores, resulting in the swelling effect not closing all micropores in dry coal. Based on these results, coal seams with low moisture and inertinite content are the most promising for CO2 adsorption. Altogether, this study provides an understanding of the percentage of inhibitor factors that affects CO2 adsorption on low-rank coal from shallow depths, which may lead to different CO2 adsorption capacities.

DOI： 10.1021/acsomega.3c04615

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PubMed

出版者・発行元：Journal of Energy Storage  

To accomplish the net-zero goal, Japan intends to increase its reliance on renewable energies such as solar power (36–38 % in 2030). However, considering the intermittent nature of solar power, the resulting energy must be transformed to a secondary energy carrier such as H2. Japan, on the other hand, is expected to import 20 × 106 tons of H2 each year by 2050. Because of these large volumes, new H2 storage techniques must be developed, in particular underground hydrogen storage (UHS). This paper ranks eight gas reservoirs out of 106 oil and gas fields in four Japanese prefectures regarding their suitability for UHS, and then suggests a H2 injection and withdrawal scheme based on the history of electricity consumption and solar power curtailment. Then, a reservoir simulation study was performed to investigate the effects of factors such as hysteresis, repeated cycles and cushion gas on the performance of these fields. The outcomes for water-drive and volumetric gas reservoirs were compared to better understand the effects of an aquifer on the long-term performance of a gas reservoir when used for UHS. Finally, it was demonstrated that the technology sought for the conversion of H2 back to electricity after withdrawal from a UHS site governs the overall efficiency of a power-H2-power process.

DOI： 10.1016/j.est.2023.107679

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出版者・発行元：Energy Science and Engineering  

In deep coal mining, the high temperature and humidity environment are one of the main disasters threatening workers and equipment. To predict the temperature and humidity of airflow in the airway accurately, this study establishes a numerical calculation model of the surrounding rock temperature, airflow temperature, and humidity under the conditions of considering the moisture evaporation and heat absorption of the airway wall, the condensation and heat release of supersaturated water vapor in the airflow, and the influence of air compression or expansion. Combined with the two-dimensional (2D) heat conduction model (considering the influence of the axial surrounding rock heat conduction of the airway), the axial strip partial moisture calculation model of the airway is proposed, and then the uniform moist wall model and the axial strip partial moist wall model are established. The influence of different parameters on the temperature and humidity of airflow is discussed by analyzing the results of numerical simulation of the uniform wet surface model (UWSM) and partly wet surface model (PWSM) of the airway wall. The results show that the surrounding rock temperature, especially the temperature distribution of the airway wall, calculated by using the 2D heat conduction model under the local humid airway conditions, is more realistic. The increment of airflow temperature decreases with the increase of wet area ratio, airflow temperature at the entrance and airway radius, and increases with relative humidity at the entrance. The calculation accuracy of temperature and humidity prediction for large ventilation networks can be further improved by using the equivalent humidity of the UWSM to replace the correction coefficient of the wet area ratio of the PWSM.

DOI： 10.1002/ese3.1431

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出版者・発行元：Journal of Dispersion Science and Technology  

Fluids incorporating carbon dioxide (CO2) microbubbles have been utilized to promote enhanced oil recovery from hydrocarbon reservoirs. The performance of such fluids in porous media is greatly affected by both the bubble size and stability. On this basis, the present study evaluated the effects of varying the concentrations of a xanthan gum (XG) polymer, a surfactant (sodium dodecyl sulfate: SDS) and sodium chloride (NaCl) on both the stability and bubble size distribution (BSD) of CO2 microbubbles. CO2 microbubble dispersions were prepared using a high-speed homogenizer in conjunction with the diffusion of gaseous CO2 through aqueous solutions. The stability of each dispersion was ascertained using a drainage test, while the BSD was determined by optical microscopy and fitted to either normal, log-normal or Weibull functions. The results showed that a Weibull distribution gave the most accurate fit for all experimental data. Increases in either the SDS or XG polymer concentration were found to decrease the microbubble size. However, these same changes increased the microbubble stability as a consequence of structural enhancement. The addition of NaCl up to a concentration of 10 g/L (10 g/1000g) decreased the average bubble size by approximately 2.7%. Stability was also reduced as the NaCl concentration was increased because of the gravitational effect and coalescence.

DOI： 10.1080/01932691.2021.1974873

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出版者・発行元：International Journal of Hydrogen Energy  

Underground hydrogen storage (UHS) in depleted hydrocarbon reservoirs is a prospective choice to store enormous volumes of hydrogen (H2). However, these subsurface formations must be able not only to store H2 in an effective and secure manner, but also to produce the required volumes of H2 upon demand. This paper first reviews the critical parameters to be considered for geological analysis and reservoir engineering evaluation of UHS. The formation depth, the interactions of rock-brine-H2, the caprock (seal) and well integrity are the most prominent parameters as far as UHS is concerned. In respect of these critical parameters, tentative H2 storage is screened from the existing gas storage fields in the Niigata prefecture of Japan, and it was revealed that the Sekihara gas field is a suitable candidate for UHS with a storage capacity of 2.06 × 108 m3 and a depth of 1000 m. Then, a series of numerical simulations utilizing CMG software was conducted to find out the extent to which critical parameters alter H2 storage capacity. The results demonstrated that this field, with a recovery factor of 82.7% in the sixth cycle of production is a prospective site for H2 storage.

DOI： 10.1016/j.ijhydene.2022.12.108

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出版者・発行元：Journal of Petroleum Exploration and Production Technology  

In this study, the CO2 adsorption capacity was measured on Indonesian low-rank coals in the raw and dry conditions in powder and block states using different coal sample preparation to estimate CO2 sequestration and storage potential. Coal sample specimens were taken from three different areas in the South Sumatra Basin, Indonesia. The adsorption experiments were performed using the volumetric method at a temperature of 318.15 K and pressure up to 3 MPa. The CO2 excess adsorption capacity of powder coal is always higher than block coal. Moreover, decreasing moisture content by the drying process increases CO2 adsorption capacity on coal. Based on fitted CO2 adsorption experimental data with the Langmuir and Freundlich isotherm model, the adsorption occurs on monolayer and multilayer at various conditions. Langmuir volume capacity and pressure show drying and crushing process increased adsorption capacity. However, the drying process affects more the capability of coal to adsorb CO2 than the powdered sample, especially in low-rank coal. It was also observed adsorption capacity is directly proportional to huminite content in the coal. Due to lower moisture and higher huminite contents, the dried WB coal powder had the highest CO2 adsorption capacity over the other coal samples in similar sample conditions. Altogether, this study may provide a better understanding in CO2 adsorption on low-rank coal with different coal sample preparation resulting in different CO2 adsorption capacity.

DOI： 10.1007/s13202-022-01569-z

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出版者・発行元：Fuel  

Evaporation and condensation of moisture affect dramatically the spontaneous combustion of lignite with high moisture content at low temperatures. Moisture migration between the lignite and the external environment of coal stockpile encompasses the scales of individual particles and stockpile. The cyclic moisture evaporation/condensation test was applied to investigate moisture migration of individual lignite particles at different particle sizes and temperatures. The wire-mesh basket test was selected primarily to analyze the heating process and critical self-ignition temperature of lignite stockpile. Results of the cyclic moisture evaporation/condensation test reveal that the moisture content of re-saturated lignite is much lower than that of the original one. Moisture content versus time showed a tendency to overlap in repeated moisture evaporation processes, and so did the repeated moisture evaporation processes. Therefore, a model of moisture migration of individual particles was built to describe the repeated moisture evaporation and condensation processes. The time factor determines the speed of moisture evaporation and condensation of individual lignite particles, being inversely proportional to ambient temperature and proportional to particle size, respectively. In the wire-mesh basket test, the heating process of the lignite stockpile can be divided into four stages, but the influence of moisture was more pronounced in stage II. Critical self-ignition temperature is proportional to particle size and increases linearly with moisture content. According to Frank-Kamenetskii theory, an increase in either particle size or moisture content can restrain the tendency of spontaneous combustion of Baiyinhua lignite stockpile.

DOI： 10.1016/j.fuel.2022.126774

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出版者・発行元：SPE Western Regional Meeting Proceedings  

Wellbore instability is a major preoccupation during drilling operations and is highly dependent of the physiochemical features of the drilling mud. The hydrophilic clays are used in making drilling mud as they provide extensive viscosity and gel strength, and other rheological properties important for optimum drilling mud performance. However, the segregation of the suspended particles of the once optimum mud to create mud cake against the wellbore formation leads to phases imbalance in the mud system, degrading the physiochemical characteristics of the now worn-out mud after several cycling in and out of the well. Although it is crucial to consider the influence of bottomhole conditions in mud rheological alteration, it is necessary to highlight the direct correlation of most mud physiochemical features with the swelling index of the mud. Therefore, optimization of drilling mud is still up to date mostly about swelling control of the mud thus solid-liquid balancing. Overtime, research papers addressing drilling mud enhancement transitioned from mechanical means such as Loss Circulation Materials (LCM) to chemical additives including polymers which as economically profitable and have swelling abilities. Polyvinyl alcohol one most desirable polymers for future drilling fluid designing as it has proved to influence mud rheology and cake filtration positively. Therefore, this study is an attempt to assess the impact of polyvinyl alcohol on wellbore isolation of a water-based drilling mud. The experiment included two types of Polyvinyl Alcohol (PVOH): Non-ionic PVOH and Cationic PVOH. Each PVOH was added to a set of 3 samples at concentrations 0.1, 0.3, and 0.5 wt.%. An additional sample with no polymer was used as a reference sample. The samples were each subjected to 5h of static pressurized filtration at atmospheric temperature. After which Spectral analysis where performed, and Permeability estimated using Darcy's Law. The results show significant influence on Polyvinyl Alcohol on mud phases distribution. Major dehydration of samples was observed as the sample without PVOH recorded the highest filtrate production while the samples with Cationic, Non-Ionic, and Conventional PVOH had average reduction of 21%,38%, and 43% respectively. The mud cake permeability of samples drastically drops at the least concentration of PVOH with a noticeable difference in permeability despite having the same PVOH concentrations. Those differences are attributed to PVOH-specific structural compositions. This study provides evidence of Polyvinyl Alcohol being responsible for improving mud thermal stability while helping any industry applying drilling activities to expand the range of polymer types that can be used to attain the desired drilling mud for a particular formation.

DOI： 10.2118/213014-MS

Scopus

出版者・発行元：Society of Petroleum Engineers - Asia Pacific Unconventional Resources Symposium, APUR 2023  

The current thermal recovery processes of bitumen consume tremendous amounts of water and energy and even emit greenhouse gases (GHGs). As a solution, this study proposes a cold bitumen recovery that adapts the CO2 huff-n-puff process combined with horizontal wells and gravity drainage on the premise that CO2 gas is more soluble in bitumen at lower temperatures. This process generates CO2 -based foamy bitumen, introduces swelling phenomenon in the huff stage due to CO2 dissolution in the bitumen phase, and provides foam expansion in the puff stage because of CO2 liberation. Due to pressure differences, gravity, and foam expansion, foamy bitumen is drained into the production well. Therefore, the current study aims to evaluate the potential of this method after the impacts of important parameters on the foam expansion such as temperature, pressure, viscosity, and solubility are investigated. The studied conditions are 2, 3, and 4 MPa of CO2 injection pressure under temperatures of 25, 35, 45, and 55 °C. The results from the adapted CO2 huff-n-puff experiment show that the solubility of CO2 in bitumen increases at higher injecting pressures and lower temperatures. The highest expansion factors which are about 9 were obtained at the highest injecting pressure at 25 and 35 °C followed by the expansion from 3 MPa injecting pressure at 45 and 55 °C. The third place is shared by the injecting pressure of 3 MPa at 25 and 35 °C and injecting pressure of 4 MPa at 45 and 55 °C. The lowest expansion factor was obtained at the lowest injecting pressure at the highest temperature. These peculiar results indicate that temperature, pressure, viscosity, and solubility possess unique roles and strongly influence each other in a certain manner that can either benefit or hinder the foam expansion. It also depicts that with a harmonious and optimal combination of all these parameters, a high expansion of CO2 -based foamy bitumen is achievable. Besides, the current highest expansion factor of this study proves that this cold production is theoretically capable of driving bitumen out of the pore spaces even without the assistance of gravity drainage or any form of heating.

DOI： 10.2118/217325-MS

Scopus

出版者・発行元：Society of Petroleum Engineers - ADIPEC, ADIP 2023  

A method for reducing power peak is to store hydrogen (H2) underground in depleted gas reservoirs (hereafter UHS). In contrast to alternative solutions, like salt caverns or aquifers, the availability of depleted gas reservoirs gives a greater storage capacity. But choosing the right gas field for the UHS and carrying it out are tricky. As a result, the goal of this work is to characterize the UHS in the chosen field and rank Japanese gas fields for it. To begin with, we ranked and screened potential H2 storage locations in Japan using the Analytical Hierarchy Process (AHP). The best locations for UHS, according to our calculations using the AHP approach, are Sekihara, Kumoide, Katakai, Nakajo, Kubiki, Shiunji, Iwafune-oki (gas), and Minami-Nagaoka. These fields' high flow capacity, depth, current reservoir pressure, and dip angle are the causes of their elevated position. Then, based on a volumetric reservoir, we studied the H2 injection, storage, and withdrawal capacity at the chosen site in the Niigata Prefecture using the CMG reservoir simulator. For the first time in Japan, this work offers a framework for evaluating and ranking potential depleted gas reservoirs as a UHS option. It also includes a reservoir simulation study to comprehend the impact of various parameters such as hysteresis trapping, number of injection and withdrawal cycles, and type of cushion gas on the efficiency of H2 storage and withdrawal in a volumetric gas reservoir.

DOI： 10.2118/216987-MS

Scopus

出版者・発行元：Petroleum Science and Technology  

The dissolution of fine particles into flowing and stranded fluids is not only one of the most prominent formation damage problems but also, is prejudicial to economic viability of oil-bearing matrices. To this end, the present paper investigates the effect of fine particles dissolution on rheological properties of heavy crude oil (API 16.6°). Because of the siliceous nature of the candidate formation, fine particles were modeled by nanoparticles. Considerations were given to silica oxide (Si-NP), alumina oxide (Al-NP) and iron oxide (Fe- NP). NPs were mixed into the dead heavy oil. Both thermogravimetric and rheological studies were used to evaluate the effect of fine migration on crude oil properties. The former revealed that the dissolution of Si-NP has the most prominent effect on physical properties compared to Al-NP and Fe-NP. The dissolution of Si-NP increased the oil viscosity up to 26 cP which was 22% larger than the oil without Si-NP. Increasing the load in Si-NP enhanced the stripping of the heaviest fractions of the crude oil (asphaltenes) from the bulk. The study attributed these results to the decrease in activation energy. The findings of this study can help for better understanding of crude oil upgrading using NP dissolution.

DOI： 10.1080/10916466.2022.2049817

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出版者・発行元：Journal of Environmental Chemical Engineering  

In this study, the crystal structures of the 2-amino-1-methyl-1H-benzimidazol-3-ium(O,O-di-isopropylphosphorodithioate) ionic liquid - [C8H10N3]+ [C6H14O2P1S2]- [(MAB+H)DIPDTP] and bis(1-methyl-1 H-benzimidazol-2-amine)-bis(O,O-di-isopropyl phosphorodithioato)-cadmium(II) - C28H46Cd1N6O4P2S4 [Cd(MAB)2(DIPDTP)2]) are characterized by X-ray diffraction analysis. Organic ligands - O,O-di-isopropylphosphorodithioate (DIPDTP), 1-methyl-1 H-benzimidazol-2-amine (MAB), and new acid-base bi-functional protonic ionic liquid ([(MAB+H)DIPDTP]) - are immobilized into commercial polymeric crosslinked polystyrene-divinylbenzene sorbent (PAD600) and their sorption capacity for Cd2+ from aqueous solution is evaluated. The successful immobilization of DIPDTP and MAB into macroporous polystyrene is confirmed by means of scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), Fourier-transform infrared spectroscopy (FTIR), and N2-BET analysis. The Cd2+ sorption efficiency of PAD600-MAB-DIPDTP sorbent increases due to the combination of physical adsorption and extraction, surface complexation, and formation of metal complexes, chelates, and poorly soluble compounds. The adsorption equilibrium data are better fitted to the Freundlich isotherm models. The overall sorption is exothermic and spontaneous and follows a pseudo-second-order kinetic model. This indicates a complex sorption mechanism, including both physical adsorption and strong chemical interaction, dissociation constant, acid-base properties, and reaction condition (pH, temperature, concentration, etc.). The novel composite material can be a promising adsorbent for Cd2+ removal from contaminated water.

DOI： 10.1016/j.jece.2022.108900

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Web of Science

出版者・発行元：Combustion Science and Technology  

This study presents a novel cross-linked gel to prevent coal spontaneous combustion. Complex Water-Solution (C-WS) of sodium metasilicate nonahydrate (SMN) and polyvinyl alcohol (PVA) was used to wet coal particles and reacted with CO2 from coal oxidation and natural atmospheric air to form the cross-linked gel (SMN/PVA gel), which was examined by measuring critical self-ignition temperature (CSIT) through the wire-mesh basket test. Baiyinhua lignite coal excavated from Inner Mongolia was used to investigate the inhibitory effect of SMN/PVA gel. Wire-mesh basket test results indicated the fire-prevention effectiveness of the SMN/PVA gel from C-WS was superior to those of pre-formed SMN/PVA gels. It snugly covered the coal particle surface and inlets of micropores to prevent oxygen ingress and water emission, and thus exhibited excellent performance in stability and compatibility. Based on the present tests, the concentrations of SMN-16 wt% and PVA-0.5 wt% in C-WS were best and increased the CSIT of raw coal by 26°C. The effect of wetting C-WS on CSIT for different including coal pile volume and particle size has been presented as an empirical equation to estimate the CSITs for SMN and PVA concentrations to consider field applications.

DOI： 10.1080/00102202.2020.1867544

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出版者・発行元：Energies  

This study proposed a novel foam EOR technique using Pseudomonas aeruginosa to generate the foam and investigated the potential of the microbial foam EOR to modify the permeability of a high-permeability porous system. We investigated oxygen nanobubble, carbon dioxide nanobubble and ferrous sulfate concentrations to discover the optimal levels for activating the foam generation of the microorganism through cultivation experiments. We also clarified the behavior of the microbial foam generation and the bioproducts that contribute to the foam generation. The potential of the foam to decrease the permeability of high-permeability porous systems was evaluated through flooding experiments using sand pack cores. The foam generation became more active with the increase in the number of nanobubbles, while there was an optimal concentration of ferrous sulfate for foam generation. The foam was identified as being induced by the proteins produced by the microorganism, which can be expected to bring about several advantages over surfactant-induced foam. The foam successfully decreased the permeability of high-permeability sand pack cores to half of their initial levels. These results demonstrate that the microbial foam EOR has the potential to decrease the permeability of high-permeability porous systems and improve the permeability heterogeneity in oil reservoirs.

DOI： 10.3390/en15072344

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記述言語：英語  

To further improve carbon dioxide enhanced oil recovery CO_2-EOR efficiency in heterogeneous reservoirs, the use of CO_2 microbubbles as a temporary blocking agent is attracting widespread interest due to their significant stability. This study aims to investigate the plugging performance of CO_2 microbubbles in both homogeneous and heterogeneous porous media through a series of sandpack experiments. First of all, CO_2 microbubble fluids were generated by stirring CO_2 gas diffused into polymer (Xanthan gum (XG)) and surfactant (Sodium dodecyl sulfate (SDS)) solution with different gas: liquid ratios. Then, CO_2 microbubbles fluids were injected into single-core and dual-core sandpack systems. The results show that the rheological behaviors of CO_2 microbubble fluids in this study were followed the Power-law model at room temperature. The apparent viscosity of CO_2 microbubble fluid increased as the gas: liquid ratio increased. CO_2 microbubbles could block pore throat due to the “Jamin effect” and increase the resistance in porous media. The blocking ability of CO_2 microbubbles reached an optimal value at the gas:liquid ratio of 20 % in the homogeneous porous media. Moreover, the selective pugging ability of CO_2 microbubbles in dual-core sandpack tests was significant. CO_2 microbubbles exhibited a good flow control profile in the high permeability region and flexibility to flow over the pore constrictions in the low permeability region, leading to an ultimate fractional flow proportion (50%:50%) in the dual-core sandpack model with a permeability differential of 1.0:2.0 darcy. The fractional flow ratio was considerable compared with a polymer injection. At the higher heterogeneity of porous media (0.5:2.0 darcy), CO_2 microbubble fluid could still establish a good swept performance. This makes CO_2 microbubble fluid injection a promising candidate for heterogeneous reservoirs where conventional CO_2 flooding processes have limited ability. This finding would be helpful in developing the utilization of CO_2 microbubbles in EOR operation by better understanding their plugging mechanism in porous media.

CiNii Research

出版者・発行元：Journal of Petroleum Science and Engineering  

To further improve carbon dioxide enhanced oil recovery CO2-EOR efficiency in heterogeneous reservoirs, the use of CO2 microbubbles as a temporary blocking agent is attracting widespread interest due to their significant stability. This study aims to investigate the plugging performance of CO2 microbubbles in both homogeneous and heterogeneous porous media through a series of sandpack experiments. First of all, CO2 microbubble fluids were generated by stirring CO2 gas diffused into polymer (Xanthan gum (XG)) and surfactant (Sodium dodecyl sulfate (SDS)) solution with different gas: liquid ratios. Then, CO2 microbubbles fluids were injected into single-core and dual-core sandpack systems. The results show that the rheological behaviors of CO2 microbubble fluids in this study were followed the Power-law model at room temperature. The apparent viscosity of CO2 microbubble fluid increased as the gas: liquid ratio increased. CO2 microbubbles could block pore throat due to the “Jamin effect” and increase the resistance in porous media. The blocking ability of CO2 microbubbles reached an optimal value at the gas:liquid ratio of 20% in the homogeneous porous media. Moreover, the selective pugging ability of CO2 microbubbles in dual-core sandpack tests was significant. CO2 microbubbles exhibited a good flow control profile in the high permeability region and flexibility to flow over the pore constrictions in the low permeability region, leading to an ultimate fractional flow proportion (50%:50%) in the dual-core sandpack model with a permeability differential of 1.0:2.0 darcy. The fractional flow ratio was considerable compared with a polymer injection. At the higher heterogeneity of porous media (0.5:2.0 darcy), CO2 microbubble fluid could still establish a good swept performance. This makes CO2 microbubble fluid injection a promising candidate for heterogeneous reservoirs where conventional CO2 flooding processes have limited ability. This finding would be helpful in developing the utilization of CO2 microbubbles in EOR operation by better understanding their plugging mechanism in porous media.

DOI： 10.1016/j.petrol.2022.110187

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Scopus

記述言語：英語  

This study proposed a novel foam EOR technique using Pseudomonas aeruginosa to generate the foam and investigated the potential of the microbial foam EOR to modify the permeability of a high-permeability porous system. We investigated oxygen nanobubble, carbon dioxide nanobubble and ferrous sulfate concentrations to discover the optimal levels for activating the foam generation of the microorganism through cultivation experiments. We also clarified the behavior of the microbial foam generation and the bioproducts that contribute to the foam generation. The potential of the foam to decrease the permeability of high-permeability porous systems was evaluated through flooding experiments using sand pack cores. The foam generation became more active with the increase in the number of nanobubbles, while there was an optimal concentration of ferrous sulfate for foam generation. The foam was identified as being induced by the proteins produced by the microorganism, which can be expected to bring about several advantages over surfactant-induced foam. The foam successfully decreased the permeability of high-permeability sand pack cores to half of their initial levels. These results demonstrate that the microbial foam EOR has the potential to decrease the permeability of high-permeability porous systems and improve the permeability heterogeneity in oil reservoirs.

CiNii Research

出版者・発行元：Gases  

Enhanced coal bed methane recovery using gas injection can provide increased methane extraction depending on the characteristics of the coal and the gas that is used. Accurate prediction of the extent of gas adsorption by coal are therefore important. Both experimental methods and modeling have been used to assess gas adsorption and its effects, including volumetric and gravimetric techniques, as well as the Ono–Kondo model and other numerical simulations. Thermodynamic parameters may be used to model adsorption on coal surfaces while adsorption isotherms can be used to predict adsorption on coal pores. In addition, density functional theory and grand canonical Monte Carlo methods may be employed. Complementary analytical techniques include Fourier transform infrared, Raman spectroscopy, XR diffraction, and 13C nuclear magnetic resonance spectroscopy. This review summarizes the cutting-edge research concerning the adsorption of CO2, N2, or mixture gas onto coal surfaces and into coal pores based on both experimental studies and simulations.

DOI： 10.3390/gases2010001

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.4236/msce.2022.102005

記述言語：英語  

Enhanced coal bed methane recovery using gas injection can provide increased methane extraction depending on the characteristics of the coal and the gas that is used. Accurate prediction of the extent of gas adsorption by coal are therefore important. Both experimental methods and modeling have been used to assess gas adsorption and its effects, including volumetric and gravimetric techniques, as well as the Ono–Kondo model and other numerical simulations. Thermodynamic parameters may be used to model adsorption on coal surfaces while adsorption isotherms can be used to predict adsorption on coal pores. In addition, density functional theory and grand canonical Monte Carlo methods may be employed. Complementary analytical techniques include Fourier transform infrared, Raman spectroscopy, XR diffraction, and C^^<13> nuclear magnetic resonance spectroscopy. This review summarizes the cutting-edge research concerning the adsorption of CO_2, N_2, or mixture gas onto coal surfaces and into coal pores based on both experimental studies and simulations.

CiNii Research

出版者・発行元：Society of Petroleum Engineers - SPE Asia Pacific Oil and Gas Conference and Exhibition 2022, APOG 2022  

Swelling control is an elaborated balancing of solid-liquid ratios in the mud, influencing crucial physiochemical features. Mechanical swelling control methods showing limitations drove recent researchers to consider chemical agents, including polyvinyl alcohol (PVOH). PVOH is known to have a swelling ability to improve mud rheology. The present study investigates the synergy of PVOH and Bentonite in an aqueous environment by analyzing the effluents samples. Three types of PVOH were selected: a standard PVOH and two modified PVOHs (a non-ionic group PVOH and a cationic group PVOH-3 attached to the carbon backbone. Except for the control sample (sample without polymer), PVOHs were added to different mud samples at ranging concentrations of 0.1 wt.% to 0.5 wt.%; each has a bulk volume of 400 ml. Each mud sample was filtrated at room temperature under an applied pressure of 1.28 MPa for 5 hours. The samples' effluents were then analyzed for polymer adsorption. Preliminary filtration tests revealed further effluent production reduction with increased PVOH concentration. Compared to the control sample, samples containing standards PVOH-1, Non-ionic PVOH-2, and Cationic PVOH-3, respectively, had their mud cake mass increase of 48%, 36%, and 38%, while respectively having filtrate recovery reduction of 21%, 19%, and 43%. Adsorption tests showed mud swelling owes primarily to hydrogen bonding which is counteracted by the presence of a charged group. Mud swelling is, therefore, dependent on the rate of hydrogen bounding in a system.

DOI： 10.2118/210694-MS

Scopus

出版者・発行元：Society of Petroleum Engineers - SPE Conference at Oman Petroleum and Energy Show, OPES 2022  

The effect of kaolinite fine particles migration and wettability alteration during low salinity water-flooding (LSW-flooding) has been investigated for Omani sandstone reservoirs. Water flooding by re-injecting the reservoir brine is currently operated in the subjected Omani oil fields, and LSW is one of the operations to improve the oil production. However, relatively large amount of precipitated oil sludge was observed in the production and surface facilities along with the produced crude oil. In present experimental study, Omani intermediate oil (API gravity of 30°) and oil sludge were sampled from a skimming tank in the production facility. The physical and chemical characteristics of the clay particles were analyzed by a laser particle size distribution analyzer, SEM, XRD, and SQX after separated from oil. Furthermore, water-flooding tests by brine and LSW were carried out using Berea sandstone cores saturated by three different conditions of the Omani oil and kaolinite fine particles to simulate clay particles in the reservoir conditions. The kaolinite-particles slurry of 0.4μm in average size were used for the tests. The first core was saturated with oil only, the second one was filled up with kaolinite fine particles slurry then saturated with the oil, and the third one was saturated with the mixture of kaolinite-particles slurry and the oil. The results of LSW flooding after brine flooding showed that 30 % increase of oil recovery was obtained in the cases including kaolinite fine particles compared to that of oil only. In addition, the wettability of the cores contained kaolinite fine particles showed stronger water-wettability than the core without kaolinite. Zeta potential was measured to investigate the surface charge of kaolinite-particles in brine and water. The kaolinite fine particles were negatively charged as -15 mV in the brine, while it was -50 mV in the LSW used for the LSW flooding test. This difference has explained that the increase of oil recovery ratio in the water-flooding test was induced by kaolinite fine particles in the cores. The ions were traced in the effluents in LSW flooding, and it was found that the concentration of Ca2+ and Mg2+ reduced sharply from their initial concentration of 722 and 788 ppm to 34 and 26 ppm respectively with pH increasing from 6.8 to below 9.0.Those results indicate clearly that the kaolinite fine particles have a function to reduce the Sor and shift the wettability to water-wet that attributed to the interactions between oil, water and kaolinite-particles in the process of LSW flooding.

DOI： 10.2118/200253-MS

Scopus

出版者・発行元：Society of Petroleum Engineers - SPE Asia Pacific Oil and Gas Conference and Exhibition 2022, APOG 2022  

The foam improves heterogeneity of permeability in oil reservoir and contributes to enhancing oil recovery. Both surfactant and gas are alternatingly injected into oil reservoir in foam EOR, therefore, it has several challenges: high cost of surfactant, formation of precipitation with bivalent cations, adsorption of surfactant on reservoir rock, etc. This study proposes the microbial foam EOR which overcomes those challenges by having microorganism generate foam in-situ. We have found an ability of a microorganism belonging to Pseudomonas aeruginosa to generate foam under anaerobic conditions. This study investigated the source materials constructing the foam and capacity of the foam to improve the heterogeneity of the permeability. The challenges of our study are the reproducibility of the foam generation and the foam stability. This study therefore examined the source materials of the foam to understand the mechanisms of the foam generation. We focused on protein, which has been suggested as a possible component of the foam in our previous studies, and examined the relationship between the amount of foam generated by P. aeruginosa and the concentration of protein in its culture solution. As a result, a positive correlation was found between them. This result indicates that the foam generated by P. aeruginosa is composed of the protein produced by the microorganism. Next, the performance of the foam decreasing permeability of high permeability porous media was evaluated through sand pack flooding experiment. P. aeruginosa was injected into a sand pack and cultivated in-situ. The post-flush water was injected into the sand pack after three days' in-situ cultivation to measure the permeability. As a result, the permeability of the sand pack was successfully decreased to half after the cultivation. The permeability of a sand pack in which P. aeruginosa was injected with culture medium and in-situ cultivated was successfully decreased to half of initial. The efflux of bacterial cells of P. aeruginosa was detected after injecting 1.3 pore volumes of postflush water, which shows that the postflush water flowed through areas other than the area where P. aeruginosa grew and produced the foam. These results indicate that the foam produced in-situ by P. aeruginosa is effective for improving the heterogeneity of permeability in oil reservoir. This EOR can be operated at low cost without expensive chemicals. Because the foam produced by P. aeruginosa is induced by proteins, the precipitation will not be formed in oil reservoir. The stability of protein-induced foam is higher than that of surfactant-induced foam in the presence of oil or high saline conditions. The microbial foam EOR therefore has high potential improving the heterogeneity of permeability in oil reservoir more effectively than the conventional foam EOR.

DOI： 10.2118/210696-MS

Scopus

出版者・発行元：83rd EAGE Conference and Exhibition 2022  

Carbon dioxide (CO2) gas injection into depleted oil reservoirs is a promising approach to achieve the goal of a neutral carbon society. However, the heterogeneity of formation generally challenges the oil recovery efficiency. The CO2 gas injection preferably flows in the high permeability zone and leaves behind the remaining oil in the lower permeability region. This study presented a new CO2-Colloidal Gas Aphrons fluid to restrict fluid flow in the high permeability zone, and increase swept volume in the low permeability zone. We conducted dual parallel sandpacks with different permeabilities models to evaluate the plugging ability and oil recovery improvement of CO2-CGAs injection in heterogeneous porous media. The results reveal that CO2-CGAs can block the pore throat in the high permeability sandpack and change the flow direction to the low permeability sandpack. Overall, the sweep efficiency in the low permeability region was increased significantly, which led to an improvement in the total oil recovery factor by 39 %.

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.3390/en14216922

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1021/acs.energyfuels.1c02333

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.3390/computation9060065

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1021/acsomega.1c00079

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1016/j.colsurfa.2021.126688

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

In this study, pressure response at A monitoring well in early stage of CO2 geological storage were predicted against pressure build-up at CO2 injector after starting CO2 injection into a deep saline aquifer to design the monitoring well distance from the injector and resolution or sensitivity of a pressure transmitter installed in the monitoring well. The numerical simulations on pressure distributions and expanding CO2 plume front were carried out using a reservoir simulator, CMG-STARS, for the aquifer (10 km in radius, 50m in height) with open boundary under 1,000 m from the ground or seabed level. The ratio of pressure response at the monitoring well against the pressure build-up at the injector have been presented for various monitoring locations (500 to 5,000 m　from a injector) and homogeneous and heterogeneous models of horizontal permeability distribution in the aquifer (Base Model and Model 1, 2 & 3) and CO2 injection patters during 100 days (Scheme 1, 2 & 3). It has been presented from the numerical simulation results that the monitoring well radial distance from the injector is recommended to be 2,000 to 4,000 m or less than 1000 m when the resolution or sensitivity of the pressure transmitter is 1kPa or 10kPa, respectively.

DOI： https://doi.org/10.2473/journalofmmij.137.17

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s13202-020-00852-1

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.petrol.2019.106823

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s13202-019-00755-w

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1088/2053-1591/ab4948

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s13202-019-0619-8

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s10661-019-7724-5

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acs.iecr.9b01629

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1627/jpi.62.188

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1080/13647830.2019.1644378

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1080/01932691.2019.1614046

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1007/s13202-019-0619-8

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.ejpe.2017.08.001

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.jappgeo.2018.09.009

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.4236/gep.2018.65007

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.20431/2454-7980.0401004

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.20431/2454-7980.0304008

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.9734/BJECC/2017/38328

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.petrol.2017.07.032

リポジトリ公開URL： http://hdl.handle.net/2324/1912759

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acs.energyfuels.7b00409

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1021/acs.energyfuels.6b02216

リポジトリ公開URL： http://hdl.handle.net/2324/1932061

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1016/j.juogr.2016.03.005

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1021/acs.energyfuels.6b01822

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： http://dx.doi.org/10.1021/acs.energyfuels.6b02060

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1016/j.coal.2016.08.020

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： http://dx.doi.org/10.1016/j.petrol.2016.06.040

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： http://dx.doi.org/10.1007/s13202-015-0195-5

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： https://doi.org/10.1016/j.ijggc.2016.04.001

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： http://dx.doi.org/10.4236/eng.2016.86033

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

リポジトリ公開URL： http://hdl.handle.net/2324/1935825

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

リポジトリ公開URL： http://hdl.handle.net/2324/1912758

記述言語：英語   掲載種別：研究論文（学術雑誌）  

リポジトリ公開URL： http://hdl.handle.net/2324/1935826

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.juogr.2015.05.005

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s13202-015-0195-5

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.coal.2014.02.004

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.psep.2014.04.001

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： http://dx.doi.org/10.1155/2013/985687

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1155/2012/241587

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.2495/AIR120461

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

DOI： 10.1016/j.egypro.2011.02.188

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s11027-010-9252-z

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

リポジトリ公開URL： http://hdl.handle.net/2324/18391

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s11027-010-9252-z

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

Research Topics on Resources Production and Safety Engineering (REPS), Kyuro SASAKI and Yuichi Sugai, Proceedings of International Workshop on Earth Resources Technology, 2007

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

A LABORATORY EXPERIMENTS FOR TRACER GAS DIFFUSION, N.P.WIDODO, K.SASAKI, Y.SUGAI, R.S.GAUTAMA, A.WIDIATMOJO, Proceedings of 4th International Workshop on Earth Science and Technology, 279-284, 2006

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

MEASUREMENTS OF CH4 AND CO2 ADSORPTION ISOTHERMS FOR COALS AND ITS ROLE TO ENHANCEING COAL BED METHANE AND CO2 SEQUESTRATION, P.Q.HUY, K.SASAKI and Y.SUGAI, Proceedings of 4th International Workshop on Earth Science and Technology, 271-278, 2006

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

GAS Production SYSTEM FROM METHANE HYDRATE LAYER BY HOT WATER INJECTION USING DUAL-HORIZONTAL WELLS, S.ONO, K.SASAKI and Y.SUGAI, Proceedings of 3rd International Workshop on Earth Science and Technology, 55-62, 2005

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

EFFECTS OF A GREEN TUFF ON ACTIVATING MICROORGANISMS, Y.SUGAI and K.SASAKI, Proceedings of 3rd International Workshop on Earth Science and Technology, 41-46, 2005

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Enhancing SAGD Performance using Additional Steam Injector into Oilsand Reservoir with Lateral Shale Stringers, Kyuro Sasaki, Yuichi Sugai and Kodai Kato, 26th IEA Annual Workshop & Symposium on Enhanced Oil Recovery, 2005

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Application of Biotechnology for Resource Production and Environment Remediation, Y.SUGAI, Proc. of International Workshop on Resource Science and Engineering of Rare Metals, 363-368, 2004

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Developments of Cold Storage in Underground Rock Mass and Refrigeration Cycle using CO2 Hydrates Formation, K.SASAKI and Y.SUGAI, Proceedings of International Workshop on Resource Science and Engineering of Rare Metals, 65-68, 2004

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

The Characteristic and Effective Utilization of the Green Tuff, Y.SUGAI and K.SASAKI, Proceedings of International Workshop on Resource Science and Engineering of Rare Metals, 195-196, 2004

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）  

Application of Biotechnology for Enhanced Oil Recovery, Y.SUGAI, Proceedings of Akita-Sfax Universities Joint Conference CMR-VBL’2004, 52-56, 2004

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：日本語   掲載種別：研究論文（学術雑誌）  

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Fundamental Studies on Microbial Enhanced Oil Recovery with Polymer Producer Clostridium sp. TU-15A, Y.SUGAI, Proceedings of International Symposium on Microbial Enhanced Oil Recovery, 39-45, 2000

開催年月日： 2023年11月 - 2023年12月

記述言語：英語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2023年11月 - 2023年12月

記述言語：英語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2023年11月 - 2023年12月

記述言語：英語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2023年11月

記述言語：英語   会議種別：口頭発表（一般）  

国名：オーストラリア連邦  

開催年月日： 2023年10月

記述言語：英語   会議種別：口頭発表（一般）  

開催地：Abu Dhabi National Exhibition Centre   国名：アラブ首長国連邦  

開催年月日： 2023年9月

記述言語：日本語  

開催地：愛媛大学   国名：日本国  

持続型炭素循環システムの確立を目的とし、地下に貯留したCO2を地下に生息する微生物によって、その場でメタンに変換し、再びエネルギー資源として利用できるようにする地下メタネーションが注目されている。CO2をメタンに変換するためには、その反応を担うCO2資化メタン生成菌（以降、単にメタン菌と称する）に水素を供給する必要がある。本研究では、その水素源としてかんらん石および水素化マグネシウムに着目し、様々な条件下において、各試料から発生する水素量を評価し、最適な水素発生条件を検討した。また、有望な水素発生条件において、メタン菌を水素源とともに培養し、CO2からのメタン生成量を評価した。その結果、メタン菌をCO2ならびにかんらん石と共存させて培養することによりメタンの生成が確認された。一方、かんらん石よりも多量の水素を発生する水素化マグネシウムとの共存下においてはメタンが生成しなかった。水素化マグネシウムは水素の発生とともに水酸化マグネシウムが生成し、培地がアルカリ性となるため、メタン菌の増殖・代謝が妨げられたものと考えられる。このように、本研究では、地下にも存在することが期待できるかんらん石が地下バイオメタネーションの水素源として可能性があることが示唆されたが、本研究で確認されたメタン生成量は少なく、その生成量を増加させるための各種条件の検討が今後の課題である。

開催年月日： 2023年9月

記述言語：日本語  

開催地：愛媛大学   国名：日本国  

CCSにおいて地下に圧入された超臨界CO2は、比重が地層水の比重より小さいため、帯水層の上部へと移動し、遮蔽能力が十分でない帯水層においては漏洩のリスクが懸念される。本研究においては、超臨界CO2にナノ粒子を分散させることによって超臨界CO2のみかけの比重を高め、帯水層に広くCO2を行き渡らせることによって、CO2の貯留効率を向上させることを目的としている。超臨界CO2中での分散性が高いナノ粒子の選定、ナノ粒子の分散性および分散安定性を向上させるためのナノ粒子表面の修飾および攪拌方法などを検討した。なお、本研究では、様々に実験条件を変化させて最適条件をスクリーニングするため、超臨界CO2と同様に非極性有機溶媒であり、常温常圧下で実験に供することができるn-ヘキサンを超臨界CO2の代替溶媒として実験に用いた。まず、SiO2、Al2O3、TiO2ならびにZnOのナノ粒子をそれぞれn-ヘキサンに投入し、マグネティックスターラーで30分間攪拌した後の分散性を観察した結果、TiO2およびZnOのナノ粒子は比較的分散性が高かったものの、攪拌停止1時間後にはすべて沈殿した。これらのナノ粒子にアニオン性およびカチオン性の界面活性剤を付着させ、それをn-ヘキサンに投入して同様の実験を行なった結果、Al2O3ナノ粒子およびZnOナノ粒子にアニオン性界面活性剤を吸着させることによる分散性の向上が観察された。さらに、アニオン性界面活性剤を吸着させたAl2O3ナノ粒子をn-ヘキサン中で超音波照射して攪拌することにより、48時間経過後も分散が維持されていることが確認された。これらの結果から、本研究でスクリーニングを行ったナノ粒子の中では、酸化アルミニウムナノ粒子の分散性が高く、それにアニオン性の界面活性剤を付着させることでさらに分散性が向上し、超音波処理によるナノ粒子同士の凝集体を解消させることにより、さらに分散性の向上が期待できることが明らかになった。

開催年月日： 2023年9月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：愛媛大学   国名：日本国  

CCSにおいて地下に貯留されたCO2を、地下に生息する微生物によってメタンに変換し、将来的に天然ガス資源として再利用することが検討されている。CO2をメタンに変換する微生物はメタン菌と呼ばれており、偏性嫌気性菌であるメタン菌は、一般にCCSの対象となるような地下深部に普遍的に生息している。メタン菌によるCO2のメタン変換のためには水素が必須であり、地下においてメタン菌に水素を供給する必要がある。発表者らは、枯渇油田に貯留したCO2のメタン変換を想定し、取れ残し石油の一部を分解して水素を生成する石油資化性水素生成菌を用いて水素を生成させる検討を行った。同研究によれば、メタン菌と水素生成菌が共存する培養系に、CO2と石油を供給することによりメタンの生成が確認されている。しかしながら、その生成速度が極めて遅く、とりわけ水素生成速度が反応の律速になっていることが明らかになった。そこで、石油からの水素生成ではない、別の水素源を検討しており、地下に存在する鉱物であるかんらん石に着目した。かんらん石が蛇紋岩化する際に水素が発生する反応に着目して検討を行ったところ、メタン菌が生息可能な温度（70℃）においても水素の発生が認められた。さらに、メタン菌をかんらん石とCO2とともに培養した結果、メタンの生成が確認された。これらの結果から、かんらん石を含むような地下貯留層ならびに帯水層におけるCCSにおいて、メタン菌によるCO2のメタン変換の可能性が示唆された。

開催年月日： 2023年8月

記述言語：英語   会議種別：口頭発表（招待・特別）  

国名：インドネシア共和国  

開催年月日： 2023年6月

記述言語：日本語  

開催地：秋田市にぎわい交流館   国名：日本国  

開催年月日： 2023年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：秋田市にぎわい交流館   国名：日本国  

開催年月日： 2023年6月

記述言語：日本語  

開催地：秋田市にぎわい交流館   国名：日本国  

開催年月日： 2023年5月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：九州大学   国名：日本国  

開催年月日： 2023年5月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：九州大学   国名：日本国  

開催年月日： 2023年5月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：九州大学   国名：日本国  

開催年月日： 2022年12月

記述言語：英語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2022年10月

記述言語：日本語   会議種別：口頭発表（招待・特別）  

開催地：JAEA 幌延深地層研究センター国際交流施設   国名：日本国  

開催年月日： 2022年10月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：長野   国名：日本国  

開催年月日： 2022年10月

記述言語：英語   会議種別：口頭発表（一般）  

国名：オーストラリア連邦  

開催年月日： 2022年9月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：福岡工業大学   国名：日本国  

開催年月日： 2022年8月

記述言語：日本語   会議種別：公開講演，セミナー，チュートリアル，講習，講義等  

開催地：オンライン   国名：日本国  

開催年月日： 2022年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：国立オリンピックセンター記念青少年総合センター   国名：日本国  

開催年月日： 2022年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：国立オリンピックセンター記念青少年総合センター   国名：日本国  

開催年月日： 2022年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：国立オリンピックセンター記念青少年総合センター   国名：日本国  

開催年月日： 2022年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：国立オリンピックセンター記念青少年総合センター   国名：日本国  

開催年月日： 2022年5月

記述言語：日本語  

開催地：九州大学   国名：日本国  

開催年月日： 2022年5月

記述言語：日本語  

開催地：九州大学   国名：日本国  

開催年月日： 2022年5月

記述言語：日本語  

開催地：九州大学   国名：日本国  

開催年月日： 2022年4月

記述言語：日本語   会議種別：公開講演，セミナー，チュートリアル，講習，講義等  

開催地：オンライン   国名：日本国  

開催年月日： 2022年3月

記述言語：日本語   会議種別：公開講演，セミナー，チュートリアル，講習，講義等  

開催地：オンライン   国名：日本国  

開催年月日： 2021年11月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：函館   国名：日本国  

開催年月日： 2021年11月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：オンライン   国名：日本国  

開催年月日： 2021年10月

記述言語：英語   会議種別：口頭発表（一般）  

国名：インドネシア共和国  

開催年月日： 2021年9月

記述言語：英語   会議種別：口頭発表（一般）  

開催地：オンライン   国名：日本国  

開催年月日： 2021年9月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：オンライン   国名：日本国  

開催年月日： 2021年9月

記述言語：英語   会議種別：口頭発表（一般）  

開催地：オンライン   国名：日本国  

開催年月日： 2021年9月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：オンライン   国名：日本国  

開催年月日： 2021年7月

記述言語：英語   会議種別：口頭発表（一般）  

国名：グレートブリテン・北アイルランド連合王国(英国)  

開催年月日： 2021年6月

記述言語：英語   会議種別：口頭発表（一般）  

国名：アラブ首長国連邦  

開催年月日： 2021年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：オンライン   国名：日本国  

開催年月日： 2021年6月

記述言語：英語   会議種別：口頭発表（一般）  

開催地：オンライン   国名：日本国  

開催年月日： 2021年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：オンライン   国名：日本国  

開催年月日： 2021年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：オンライン   国名：日本国  

開催年月日： 2021年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：オンライン   国名：日本国  

開催年月日： 2021年5月

記述言語：日本語  

開催地：九州大学   国名：日本国  

開催年月日： 2021年5月

記述言語：日本語  

開催地：九州大学   国名：日本国  

開催年月日： 2021年5月

記述言語：日本語  

開催地：九州大学   国名：日本国  

開催年月日： 2021年5月

記述言語：日本語  

開催地：九州大学   国名：日本国  

開催年月日： 2020年11月

記述言語：英語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2020年11月

記述言語：英語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2020年10月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：オンライン   国名：日本国  

開催年月日： 2020年10月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：オンライン   国名：日本国  

開催年月日： 2020年9月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：オンライン   国名：日本国  

開催年月日： 2020年5月

記述言語：日本語  

開催地：誌上での発表   国名：日本国  

開催年月日： 2020年5月

記述言語：日本語  

開催地：誌上での発表   国名：日本国  

開催年月日： 2019年12月

記述言語：英語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2019年12月

記述言語：英語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2019年12月

記述言語：英語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2019年12月

記述言語：英語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2019年11月

記述言語：英語   会議種別：口頭発表（一般）  

国名：アラブ首長国連邦  

開催年月日： 2019年10月

記述言語：英語   会議種別：口頭発表（一般）  

国名：インドネシア共和国  

開催年月日： 2019年10月

記述言語：英語  

国名：日本国  

開催年月日： 2019年10月

記述言語：英語  

国名：日本国  

開催年月日： 2019年10月

記述言語：英語  

国名：日本国  

開催年月日： 2019年9月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：京都大学   国名：日本国  

開催年月日： 2019年9月

記述言語：英語   会議種別：口頭発表（招待・特別）  

国名：インドネシア共和国  

開催年月日： 2019年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：国立オリンピック記念青少年総合センター   国名：日本国  

開催年月日： 2019年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：国立オリンピック記念青少年総合センター   国名：日本国  

開催年月日： 2019年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：国立オリンピック記念青少年総合センター   国名：日本国  

開催年月日： 2019年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：国立オリンピック記念青少年総合センター   国名：日本国  

開催年月日： 2019年5月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：九州大学   国名：日本国  

開催年月日： 2019年5月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：九州大学   国名：日本国  

開催年月日： 2018年11月

記述言語：英語  

国名：日本国  

開催年月日： 2018年11月

記述言語：英語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2018年10月

記述言語：英語   会議種別：口頭発表（一般）  

国名：フランス共和国  

開催年月日： 2018年10月

記述言語：英語   会議種別：口頭発表（一般）  

国名：日本国  

開催年月日： 2018年8月

記述言語：英語   会議種別：口頭発表（招待・特別）  

国名：インドネシア共和国  

開催年月日： 2018年7月

記述言語：英語   会議種別：口頭発表（一般）  

国名：インドネシア共和国  

開催年月日： 2018年7月

記述言語：英語   会議種別：口頭発表（一般）  

国名：インドネシア共和国  

開催年月日： 2018年6月

記述言語：日本語  

開催地：新潟市朱鷺メッセ   国名：日本国  

開催年月日： 2018年6月

記述言語：日本語  

開催地：新潟市朱鷺メッセ   国名：日本国  

開催年月日： 2018年6月

記述言語：日本語  

開催地：新潟市朱鷺メッセ   国名：日本国  

開催年月日： 2018年6月

記述言語：英語  

国名：デンマーク王国  

開催年月日： 2018年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：九州大学   国名：日本国  

開催年月日： 2018年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：九州大学   国名：日本国  

開催年月日： 2018年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：九州大学   国名：日本国  

開催年月日： 2017年11月 - 2017年12月

記述言語：英語  

国名：日本国  

開催年月日： 2017年9月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：北海道大学   国名：日本国  

開催年月日： 2017年9月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：北海道大学   国名：日本国  

開催年月日： 2017年9月

記述言語：英語  

国名：ドイツ連邦共和国  

開催年月日： 2017年8月

記述言語：英語   会議種別：口頭発表（一般）  

国名：インドネシア共和国  

開催年月日： 2017年8月

記述言語：英語   会議種別：口頭発表（一般）  

国名：インドネシア共和国  

開催年月日： 2017年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：国立オリンピック記念青少年総合センター   国名：日本国  

開催年月日： 2017年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：熊本大学   国名：日本国  

開催年月日： 2017年6月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：熊本大学   国名：日本国  

開催年月日： 2017年3月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：千葉工業大学   国名：日本国  

開催年月日： 2016年11月

記述言語：英語   会議種別：口頭発表（一般）  

国名：アラブ首長国連邦  

開催年月日： 2016年9月

記述言語：日本語   会議種別：口頭発表（一般）  

開催地：岩手大学   国名：日本国  

開催年月日： 2016年9月

記述言語：英語   会議種別：口頭発表（一般）  

開催地：岩手大学   国名：日本国  

開催年月日： 2016年8月

記述言語：英語   会議種別：口頭発表（招待・特別）  

国名：インドネシア共和国