Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Kyuro Sasaki Last modified date:2019.04.02

Professor / Resource System Engineering / Department of Earth Resources Engineering / Faculty of Engineering


Presentations
1. Olalekan S. Alade, Dhafer Al Shehri, Mohamed Mahmoud, Kyuro Sasaki, Yuichi Sugai, Computational Fluid Dynamics CFD Evaluation of Laminar Flow of Bitumen-in-Water Emulsion Stabilized by Poly Vinyl Alcohol PVA: Effects of Salinity and Water Cut, SPE Middle East Oil and Gas Show and Conference, 2019.03, [URL], Applications of oil-in-water emulsion (O/W) emulsification technology in enhanced recovery and pipeline transportation of heavy oil can be limited by several factors including salinity of the reservoir or process water, process temperature, and water cut. In this investigation, laminar flow of O/W was simulated in a pipeline to investigate the effect of salinity of aqueous phase (NaCl) and water cut on flow characteristics of the fluid. The case was simplified by considering the O/W as a stable, pseudo-homogeneous, single-phase fluid within the conditions operated. Pertinent to the objective of the study, at flow reference temperature, Tref = 30oC, the pressure drop at 30% water cut was 931Pa compared to 84.6 Pa at water cut of 50% (reference working fluid without NaCl). In contrast, the pressure drop was 239Pa, 142Pa, 124Pa, and 82.9Pa at 70000ppm, 40000ppm, 20000ppm, and 10000ppm salinity in the aqueous phase, respectively. In addition, the maximum dynamic viscosity imposed by the fluid, was ≈81000cP at 30% water cut compared to ≈14000cP from the reference fluid. The dynamic viscosity obtained from 70000ppm salinity content was ≈34000cP. Moreover, the results confirm facile application of emulsification technology for pipeline transportation of bitumen from large reduction in pressure drop (99%) regardless of the water cut and salinity..
2. Kreangkrai Maneeintr, Kyuro Sasaki, Simulation on Heavy Oil Production With In-Situ Combustion in the Northern Oilfield of Thailand, ACE 2018 Annual Convention & Exhibition, 2018.05, [URL], An oilfield in the North of Thailand has medium viscous heavy oil. Since the normal production methods are ineffective, thermal recovery is suitable to enhance oil recovery. In-situ combustion is a complex EOR process used for this crude oil. Recovery mechanisms include viscosity reduction from heating, fluid vaporization and thermal cracking. However, a major problem is the control of the movement of the combustion front. Depending on the reservoir and fluid characteristics, the combustion front may move in a non-uniform way, with resulting poor performance. The parameters such as injection rates, oxygen concentration, and air temperature play a significant role for in-situ combustion process because they can control the sustainability of the front. Therefore, the objectives of this work are to investigate the effects of parameters on the production of heavy oil, to predict the behavior of the combustion front and to assess the optimal conditions to enhance the efficiency of heavy oil production by using simulation with the real data of the oilfield in Thailand. For this study, CMG program is used to set up and simulate the model. The formation of this oilfield is sandstone with average 500 md permeability, 18-35% porosity and 53.7 cP viscosity. The results are investigated by conducting a number of sensitivity studies with various parameters. The results show that changing injection rate from 100 Mscf/d to 400 Mscf/d has less effect on cumulative oil production which is less than 6% incremental recovery. However, an increase in oxygen concentration from 29% to 100% can enhance oil production for 40.67%. Moreover, if the injected fluid temperature is increased from 80 _F to 500 _F, total oil production increases up to 97.14%. In addition, the optimal operating conditions are adjusted to enhance recovery of oil production. A decrease in injection rate from 100 Mscf/d to 50 Mscf/d after ignition is selected. High injected fluid temperature is required to reduce ignition time. However, it is not necessary to maintain high temperature at all time. Injected fluid temperature is reduced from 300 _F to 80 _F after ignition has started. Moreover, oxygen concentration is the key of combustion process in that the smaller number of oxygen molecule reacts, the lower heat will be released. The results of this study can be applied as a fundamental data for in-situ combustion project development in the heavy oilfield in the North of Thailand in the future..
3. Ryo Ohashi, Kyuro Sasaki, Yuichi Sugai, Alade S. Olalekan, A Production Scheme for Bitumen Production from Oil Sands Reservoir with Forming Emulsion by Injecting Hot Surfactant Solution, The 23rd Formation Evaluation Symposium of Japan, 2017.10, [URL], Alternative process of Steam-Assisted Gravity Drainage (SAGD) method for bitumen recovery from oil sands reservoirs has been studied to improve production cost, thermal efficiency and environmental issues. A new production process called as the Cyclic Huff & Puff method has been proposed in this study. The method uses injecting a hot surfactant solution using horizontal wells in a staggered arrangement. In this research, viscosity measurements of original oil and emulsion in type of oil-in-water (O/W) formed by the solution of Poly Vinyl Alcohol (PVA) were carried out in order to confirm the viscosity reduction of bitumen at relatively low temperature (<150ºC). The viscosity was apparently reduced to around 18cP from 100000cP of the original bitumen at 150ºC. It was also confirmed by the laboratory experiment that PVA solution and bitumen formed the emulsion within a half hour after contacting in the beaker. Those measurement results were applied to numerical simulations by CMG STARS™. The numerical model was assumed that horizontal wells are placed at upper oil sands reservoir and other horizontal wells are located at its bottom in the staggered arrangement. When the hot PVA solution is injected from the upper wells, other bottom wells produce fluids. After a certain period, upper and lower wells are operated as opposite functions. The simulations were carried out to simulate formation of bitumen emulsion with hot PVA solution of 100°C and the emulsion move to production wells in a typical oil sands reservoir. The simulation results show that the Cyclic Huff & Puff method has a potential to be a production scheme for oil sands reservoir with less cost and higher thermal efficiency than that of SAGD method..
4. Tola Sreu, Kyuro Sasaki, Yuichi Sugai, Wettability Alteration of Sandstone with Zinc Oxide Nano-Particles, The 23rd Formation Evaluation Symposium of Japan, 2017.10, [URL], In this research, we have investigated wettability alteration of sandstone and crude oil surfaces contacting nanofluids formulated by ZnO nanoparticles. The ZnO nanofluid was mixed by dispersing into water solution of Sodium Dodecyl Sulfate that is an anionic surfactant. ZnO concentration (w/w) in the fluid ranges from 500 ppm to 5000 ppm. Oil film spread on glass plate and surface of Berea sandstone saturated by light crude oil were used to measure fluid wettability evaluated by the contact angle of fluid droplets with the sessile drop methods. It has been confirmed that the ZnO nanofluid has a potential to shift wettability to more water wet condition on the surfaces of oil film and sandstone saturated by oil..
5. Samneang Chea, Kyuro Sasaki, Yuichi Sugai, Yuji Yoshiki, Sodium Metasilicate as Blocking Performance for Enhanced Oil Recovery (EOR), The 23rd Formation Evaluation Symposium of Japan, 2017.10, [URL], Sodium Metasilicate as Blocking Performance for Enhanced Oil Recovery (EOR).
6. Ichhuy Ngo, Falan Srisuriyachai, Yuichi Sugai, Kyuro Sasaki, Study of Heterogeneous Reservoir Effects on Surfactant Flooding in Consideration of Surfactant Adsorption Reversibility, The 23rd Formation Evaluation Symposium of Japan, 2017.10, [URL], In this study, effects of surfactant adsorption and desorption on oil production were investigated in laboratory scale by using Sodium Dodecyl Benzene Sulfonate and Berea sandstone. The maximum adsorption-desorption values were measuredas57.7mg/100g and 47.9mg/100g of rock, respectively. Based on those measurement results, numerical reservoir simulations were performed with a commercial simulator, STARS, to discuss about effects of the degree of surfactant adsorption reversibility. Reservoir heterogeneity was also taken into consideration by comparing to that of homogenous reservoir. The numerical simulation results showed that the reservoir heterogeneity reduced oil recovery factor by up to 7.4%comparing to homogenous reservoir, but the effects of reversibility of surfactant adsorption on oil recovery are different due to reservoir types..
7. Kreangkrai Maneeintr, Monthicha Rawangphai, Kyuro Sasaki, Evaluation for Offshore Carbon Dioxide Geological Storage Potential in the Gulf of Thailand, 9th International Conference on Applied Energy (ICAE-2017), 2017.08, Currently climate change is one of the most concern problems because of an increase in the amount of carbon dioxide (CO2) in the atmosphere. This gas comes from the industries like power generation. Carbon capture and storage (CCS) is the practical technology to mitigate CO2 especially geological storage. In Thailand, the main potential of geological storage is in the Gulf of Thailand especially in the oil and gas fields. However, the research on this in Thailand is scarce. Consequently, this work is focusing on the simulation of CO2 geological storage in the formations of oil and gas reservoirs in the Gulf of Thailand. The fracture pressure and the storage capacity have been estimated. Also, the pressure buildup and plume migration have been simulated with various conditions by using real geological data in the area. CO2 injection is used from 1,000-4,000 tons per day with the depth from 2,000-2,500 meters and the results are studied for 50 years as a monitoring period. The results present that with the actual formation characteristics, CO2 storage in this area has potential. Moreover, pressure buildup and plume migration are presented the storage and monitoring for 50 years. As a fundamental knowledge, this study can contribute to CO2 storage in an offshore area in Thailand..
8. Kreangkrai Maneeintr, Noppawan Ruanman, Onchanok Juntarasakul, Kyuro Sasaki, Evaluation for CO2 Storage Potential in a Depleted Oil Field in the North of Thailand, Carbon Management Technology Conference (CMTC2017), 2017.07, Recently,climate change is the major global issue on environmental concern resulting from the emission of Carbon dioxide (C02) into atmosphere. The CO2 sources mainly come from fossil-fired power generation and industrial sectors. The current technology used to mitigate and store CO2 is carbon capture and storage (CCS) especially geological storage. In Thailand,C CS technology is still infant and less research has been studied. Therefore,this work is focused on the preliminary study on the CO2 onshore geological storage in one formation of a depleted oilfield in Fang,the North of Thailand by using simulation. The model with local grid refinement demonstrates how CO2 injected into depleted oilfield can be implemented with the flow rate from 1000-4000 tons/day based on the depth of this area around 2120 meters. The pressure distribution and the movement of CO2 have been studied and predicted within a period from 1-50 years for CO2 monitoring. The results present that 10 Mt of CO2 storage can be achieved. Furthermore, pressure distribution and CO2 migration are presented without breaking the caprock formation for the period of 50 years. This study can be used as a basic model for CO2 storage in an onshore area in Thailand..
9. Kyuro Sasaki, Spontaneous Combustion of Low Rank Coal; Measurement of the Critical Self-ignition Temperature, 6th World Conference on Applied Sciences, Engineering and Technology, 2017.08, [URL], In this keynote presentation, the spontaneous combustion of lignite classified as low-rank coal has been focused by introducing both of laboratory experiment (pile size; 2.5 to 10 cm) and upscale experiment (pile size; 25 to 100 cm) using the wire-mesh basket test up to 1m3 in its volume in order to clear (a) temperature-time curves in the coal pile for different size of the baskets and ambient air temperature; (b) CSIT measurement for the coal pile volume; (c) extrapolate the CSIT value against 100 m3 order in industrial stockpile volume, (d) simulate spontaneous combustion of residual coal in the mine goaf based on the critical self-ignition temperature and thermal characteristics of coal piles..
10. Yagba Jalloh, Kyuro Sasaki, Mustapha Olajiday Thomas, The Influence of Local Geology on The Groundwater Potential of Kunike Sanda and Barina, International Symposium on Earth Science and Technology 2016, 2016.12, This research investigated the influence of the local geology on the groundwater potential of the two kunike chiefdoms (Sanda and Barina) in the Tonkolili District, Northern Sierra Leone..
11. Olaleken Alade, Kyuro Sasaki, Yuichi Sugai, Bayonile Ademodi, Prospects of Bitumen Emulsification using Polymeric Surfactant for Production and Transportation: Synergistic Effect of NaOH Combination, World Heavy Oil Congress 2016, 2016.09.
12. Kyuro Sasaki, Offshore Gas Production and Seabed Subsidence by Hot Water Injection, 35th International Conference on Ground Control in Mining (China, 2016) , 2016.09.
13. Kyuro Sasaki, Yuichi Sugai, Salmawati, Wataru Kawasaki, Development of Gas-Flux Monitor to Measure Soil CO2 Emission from Ground Surface into Atmosphere at CO2 Geological Storage, 5th World Conference on Applied Sciences, Engineering and Technology, 2016.06, [URL], In this study, the gas-flux monitor and measurement methodology have been developed to measure soil CO2 emission from ground surface into atmosphere. Furthermore, a criterion or a threshold value has been presented for a warning alarm on CO2 gas leakag..
14. Arif Widiatmojo, Kyuro Sasaki, Yuichi Sugai, The Effect of Air Humidity to Coal Pile Spontaneous Combustion in Low Temperature, 5th World Conference on Applied Sciences, Engineering and Technology, 2016.06, [URL], In this study, the effect of air humidity to coal pile spontaneous combustion in low temperature has been investigated..
15. Mohammad Reza Ghulami, Kyuro Sasaki, Yuichi Sugai, Ronald Nguele, Enhanced Oil Recovery by Gas Injection; A Numerical Simulation Approach, International Symposium on Earth Science and Technology 2015, 2015.12, Enhanced Oil Recovery by Gas Injection; A Numerical Simulation Approach.
16. Hemeng Zhang, Xiaoming Zhang, Zhuo Wang, Yongjun Wang, Kyuro Sasaki, Experimental and Numerical Simulation Study on the Spontaneous Combustion of Lignite, International Symposium on Earth Science and Technology 2015, 2015.12, This study investigated self-heating characteristics of the lignite, low rank coal, by experiments with three sets of cube wire-mesh baskets placed in different temperature environments and numerical simulations on their results. .
17. Kyuro Sasaki, An Integrated Regional Low Carbon Society using with CO2 Geological Storage and Utilization, 4th World Conference on Applied Sciences, Engineering and Technology (WCSET 2015), 2015.10, [URL].
18. Arif Widiatomojo, Kyuro Sasaki, Yuichi Sugai, Simulating the Migration of CO2 in Geological Carbon Storage: A Particle Tracking Approach, 4th World Conference on Applied Sciences, Engineering and Technology, 2015.10, [URL].
19. Ronald Nguele, Kyuro Sasaki, Yuichi Sugai, Masanori Nakano, Wettability Alteration in Berea Sandstone Cores by Contact Angle Measurements, The 21st Formation Evaluation Symposium of Japan, 2015.10, [URL], This article discussed the physicochemical mechanisms occurring during wettability alteration in mixed wet rocks..
20. Junpey Kumasaka, Kyuro Sasaki, Yuichi Sugai, Masanori Nakano, Numerical Modeling of Emulsion to Investigate the SAGD Oil Production based on Viscosity Measurements, The 21st Formation Evaluation Symposium of Japan, 2015.10, [URL], In this study, the effects of emulsion generation in a steam chamber formed in oil sands reservoir have been studied for bitumen production using Steam Assisted Gravity Drainage (SAGD)..
21. Mohammad Reza Ghulami, Kyuro Sasaki, Yuichi Sugai, Numerical Simulation Study on Gas Miscibility of an Oil Field Located in Afghanistan, The 21st Formation Evaluation Symposium of Japan, 2015.10, [URL], In this study, a reservoir modeling approach was used to evaluate the miscibility conditions for an Afghan oil reservoir..
22. Arif Widiatmojo, Kyuro Sasaki, Amin Yousefi-Ssahzabi, Yuichi Sugai, Particle Tracking Simulation for Tracer Dispersion in Porous Media: A Five-spot Laboratory Model, Application of Computers and Operations Research in the Mineral Industry (37th International Symposium) (APCOM 2015), 2015.05.
23. Abu Bakarr Jalloh, Kyuro Sasaki, Application of Geostatistical Simulation for Mineral Resource Estimation by Modelling of Drillhole Data - Case Study on An Iron Ore Mine, Application of Computers and Operations Research in the Mineral Industry (37th International Symposium) (APCOM 2015), 2015.05.
24. Xiaoming Zhang, Xiaochen Yang, Zuo Wang, Kyuro Sasaki, Numerical simulation of seismic dynamic response of ground surface above mined-out area, 15th Coal Operators’ Conference (COAL2015) (Australia, Wollongong), 2015.02.
25. Widiatomojo Arif, Kyuro Sasaki, Yousefi-Sahzabi Amin, Yuichi Sugai, Meshless particle tracking simulation for tracer dispersion in a quarter five-spot model, Asian Conference on Engineering and Natural Sciences 2015, 2015.02.
26. Salmawati, Kyuro Sasaki, Yuichi Sugai, Nuhindro Priagung Widodo, Preliminary Measurements of Natural Soil CO2 Concentration in Case of CO2 Leakage in CCS Site, International Symposium on Earth Science and Technology 2014, 2014.12.
27. Yuichi Sugai, Keita Komatsu, Kyuro Sasaki, Kristian Mogensen, Martin Vad Bennetzen, Microbial-Induced Oil Viscosity Reduction by Selective Degradation of Long-Chain Alkanes, Abu Dhabi International Petroleum Exhibition and Conference, 2014.11.
28. Chanmoly OR, Kyuro Sasaki, Yuichi Sugai, Masanori Nakano, Motonao Imai, Numerical Simulation of CO2 Gas Microbubble of Foamy Oil, International Conference on Greenhouse Gas Technologies (GHGT-12) (Austine, USA), 2014.10, Heavy oil production by CO2 gas foaming has been simulated with a function of depressurization pressure. The numerical simulation was carried out by using CMG-STARSTM and based on experimental physical properties of foamy oil such as foam swelling and apparent viscosity. The matching between the numerical simulations of heavy oil drainage and experimental measurements of foaming in Berea sandstone cores (Psat = 10 MPa at 50 ºC) shows 31% of oil recovery after depressurization to atmospheric pressure. The behavior of heavy oil production and production scheme were proposed with assuming the CO2 gas dissolution zone. The effect of initial oil saturation and CO2 dissolution zone are the controlling factors of heavy oil production.
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29. Ferian Anggara, 佐々木 久郎, 菅井 裕一, CO2-ECBMRに関連した石炭特性の測定と数値シミュレーション, 資源・素材2014(熊本), 2014.09, 未開発深部石炭層からのCO2圧入によるメタンガス回収(CO2-ECBMR)は、CO2を利用する非在来型天然ガスの増進回収法として期待されており、CO2の石炭層への貯留あるいは固定化においても有効な手段として技術開発がなされている。本研究では、主に低品位炭の超臨界CO2に対する石炭マトリックスの膨潤特性と浸透率変化などの石炭特性を測定し、CO2圧力と浸透率との関係をモテル化したCO2-ECBMRの数値シミュレーションを実施した。また、石炭層内での超臨界CO2による鉱物化についてもモデル化し、数値シミュレーションを用いた長期の影響評価結果についても一部紹介した。
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30. Kyuro Sasaki, Arif Widiatmojo, Yuichi Sugai, Xiaoming Zhang, Integrated Numerical Simulation on Gas Diffusion in Mine Ventilation Network, 10th International Mine Ventilation Congress (IMVC2014), 2014.08, The Discrete Tracer Points Method (hereinafter DTPM), a Lagrangian based random walk method by making moves of imaginary points in flow regions, has been developed in this study. This method considers turbulent velocity profile, velocity fluctuations, Reynolds stress and turbulent flow intensities. The results have shown good consistency compared to other experimental and analytical results for single and straight channel flows. In order to simulate gas or dust diffusion in mine ventilation network flows, a scheme to treat the flow separation at junctions has been also developed. Furthermore, various dead spaces connected with mine ventilation airways has been modeled by considering extended region of the airways to simulate the retaining effect due to trapped gas/dust in dead spaces. In this paper, a new calculation model has been presented based on dead space ratio to induce decay time of points located in various dead spaces to get matching with experimental results by laboratory experiments using tracer gas and a rectangular cavity model constructed in an open-loop wind tunnel. Furthermore, the tracer gas measurements in the mine ventilation network flow at Kushiro Coal Mine were carried out and simulated numerically by DTPM extended by the new calculation model inducing time decay in dead spaces. The good matching simulation results have been obtained by setting dead space ratio, ψ=35% for the ventilation network. It is concluded that DTPM is a useful tool for better understanding turbulent diffusion phenomena in mine ventilation network, and it can provide easy numerical visualization since this method allows tracking record of each point, such as position at certain time and its travelling paths..
31. Kyuro Sasaki, Yuichi Sugai, Hiroki Mazuda, A New Integrated Gas Production System from Methane-Hydrate Sediments, 23rd Annual Meeting of Japan Institute of Energy (Fukuoka), 2-4-3, 2014

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33. Kyuro Sasaki, Yuichi Sugai, Shinji Ono, Gas-to-Wire System for Gas Production from Methane Hydrates Reserves, 21st World Petroleum Congress (Moscow, Russia), 2014.06, [URL], Huge Methane Hydrates (HM) reserves are expected to be unconventional natural gas resources reserved at Arctic area. However their developments are economically difficult, because dissociation heat is limited and gas transportation is costly in the area. In this study, the “Gas-To-Wire” system has been proposed to provide economical gas production system from MH layers. The system is an integrated gas production system that generates electricity using produced gas from MH reserves and sends it to onshore. Its advantage is that hot water for dissociating MH can be served from waste heat of the gas turbine electric generating system (about 60% of total combustion heat) without using additional energy. In the integrated system, generated hot water is circulated MH dissociated region including the horizontal wells filled with hot water, named as hot water chamber, was generated to produce gas continuously. The gas production rate has the maximum peak just after breakthrough of injected water between horizontal wells, then it declined and gas was produced by almost constant rate. We have successfully developed the numerical model, and matched the history of physical gas production. Moreover, numerical simulations of gas production by the hot water injection into a Nankai Trough sediment layer model using a pair of the horizontal wells 500m in length were carried out for a methane hydrate reservoir of 20 m in layer thickness, 46% of average methane hydrate saturation, 100 and 25md in horizontal and vertical absolute permeabilities, respectively. The cumulative gas production is simulated as 5×106 std-m3 for initial two years. Furthermore, a new gas production scheme, which uses the horizontal wells in radian arrangement in a methane hydrate sediment layer with area of 1km×1km located at Nankai Trough, has been presented and evaluated with the numerical simulation as the cumulative gas production for 15 years is 1.3×108 std-m3..
34. Kyuro Sasaki, Yuichi Sugai, Or Chanmoly, Yuta Yoshioka, Junpei Kumasaka, Masanori Nakano, Motonao Imai, Fluids Behaviors in Heavy Oil Production with Water-in-Oil Emulsion, CO2-Gas Foam and In-Situ Combustion, 2014 Technical Meeting of The Japanese Association for Petroleum Technology, 96-97, 2014

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35. Amin Yousefi Sahzabi, Kyuro Sasaki, Yuichi Sugai, 気候変動抑制のための大気中の二酸化炭素捕捉技術の現状と展望, 平成26年度資源・素材学会春季大会, 2014.03.
36. Kyuro Sasaki, Yuichi Sugai, Takafumi Yamakawa, Integrated Thermal Gas Production from Methane Hydrate Formation, SPE/EAGE European Unconventional Resources Conference and Exhibition (Vienna, Austria), 2014.02, Transportations and stockpiles of low-rank coals are under risks of spontaneous combustion, because they are very easy to get self heating ignition after drying or removing moisture due to high moisture and oxygen contents. In this study, the modified concept of equivalent oxidation exposure-time (“EOE-Moisture time”) has been presented for row-rank coals. The equations for the EOE-Moisture time have been formulated by considering moisture content and oxidation capacity in low temperature range to predict heat generating rate as functions of coal moisture saturation and oxygen concentration in the pile. Numerical simulations were carried out by applying the EOE-Moisture time on self-heating of low rank coal by changing coal stockpile size. It has been cleared based on the numerical simulations that temperature rising rate of the pile is increased with lower initial moisture saturation of low rank coal. It has been cleared that coal including large percent of moisture is easy to increase temperature and smaller critical diameter of coal stockpile compared with coals with low moisture..
37. Yongjun Wang, Kyuro Sasaki, Yuichi Sugai, Xiaoming Zhang, Measurement of Critical Self-Ignition Temperatures of Low Rank Coal, 14th Coal Operators’ Conference (COAL2014) (Australia, Wollongong), 2014.02, Considerable research exists on self-heating or spontaneous combustion of coal stockpiles from various aspects. The equation for critical temperature of self-ignition was derived from the Frank-Kamenetskii model expressing heat balance between heat generation rate in the centre of a coal pile and heat transfer from the outer surface of the pile. However, critical ignition-temperatures of low-rank coals has not been established for safety criteria in storing and transporting since its critical ignition-temperature is expected to be much lower than bituminous coals. In this study, experimental apparatus and measurement procedures of thermal diffusivity and internal temperature in the coal pile have been presented to evaluate the critical self-ignition temperature of coal samples. The low-rank coal samples tested were lignite and sub-bituminous with pulverized size-graded to 0.25 to 0.76mm. Their critical ignition-temperatures were evaluated based on laboratory temperature measurements of coal piles in cube mesh-boxes of three different sizes (25, 50 and 100 mm side length) placed in hot ambient-air at temperatures ranging from 50 to 140 ºC under standard atmospheric pressure. Analysis of the results has enabled the critical ignition-temperature of the coal sample to be presented as a function of stockpile volume..
38. Kyuro Sasaki, Yongjun Wang, Yuichi Sugai, Xiaoming Zhang, Numerical Modelling of Low Rank Coal for Spontaneous Combustion, 14th Coal Operators’ Conference (COAL2014) (Australia, Wollongong), 2014.02, Transportations and stockpiles of low-rank coals are under risks of spontaneous combustion, because they are very easy to get self heating ignition after drying or removing moisture due to high moisture and oxygen contents. In this study, the modified concept of equivalent oxidation exposure-time (“EOE-Moisture time”) has been presented for row-rank coals. The equations for the EOE-Moisture time have been formulated by considering moisture content and oxidation capacity in low temperature range to predict heat generating rate as functions of coal moisture saturation and oxygen concentration in the pile. Numerical simulations were carried out by applying the EOE-Moisture time on self-heating of low rank coal by changing coal stockpile size. It has been cleared based on the numerical simulations that temperature rising rate of the pile is increased with lower initial moisture saturation of low rank coal. It has been cleared that coal including large percent of moisture is easy to increase temperature and smaller critical diameter of coal stockpile compared with coals with low moisture..
39. Lifeng Li, Xiaoming Zhang, Zhiguang Wang, Yanwei Huo, Kyuro Sasaki, Application of Prediction Methods for Mine Air Temperature and Humidity, International Symposium on Earth Science and Technology 2013, 2013.12.
40. Wanjing Li, Xiaoming Zhang, Hang Dong, Kyuro Sasaki, Evaluation and Prediction of Bridge Technique Condition in Fuxin, International Symposium on Earth Science and Technology 2013, 2013.12.
41. Kyuro Sasaki, Yuichi Sugai, Arif Widiatmojo, Hideo Naka, Tracer Gas Measurements of Effective Ventilation Airflow and Its Influence on Dust Concentrations in Underground Quarry, 23rd World Mining Congress, 2013.08, Ventilation measurements were carried out in a shallow underground-quarry space with relatively large internal volume of 14,600m3 in order to evaluate its effective ventilation characteristics. Based on air velocity measurements with an ultrasonic anemometer in the exhaust airway connected to the space, it was found that the space was ventilated by natural ventilation airflow with intermittent changes in direction. It was difficult to measure the ventilation flow with typical methods of flow measurement provided from the intake portal and throughout the mine, because the cross-sectional areas of the openings was too large and the flow was variable. In the present study, a tracer gas method was applied to evaluate the effective ventilation airflow rate in the space. A photo-acoustic infra-red gas monitor, highly sensitive to sulphur hexafluoride (SF6) the tracer gas used, capable to of measuring down to 10 ppb, was set in the space to determine air exchange rates from gas concentration-time decay curves. The seasonal variations of airflow and thermal environment in the space were investigated through 13 sets of measurements taken during a year. Airborne rock dust concentrations were also measured at same time in the space. The correlations between the effective ventilation airflow rate, thermal environment and dust concentrations in the space were analyzed and are discussed based on the presented measurements taken during year. It has been concluded that the reason for the seasonal variations in effective ventilation flow and the dust concentration is mainly due to differences in air temperature in the space, as affected by the rock’s surface temperature and surface atmosphere air temperature. In summertime, the air temperature and associated air density difference generated lower natural ventilation flows resulting in higher dust concentrations..
42. Kyuro Sasaki, Yuichi Sugai, Environmental Measurements of Air at Underground Space, International Symposium on Rock Mechanics and Mine Dynamic Disaster Prevention, 2013.07.
43. Very Susanto, Kyuro Sasaki, Yuichi Sugai, T. Yamashiro, Mixing Gas Migration in Fractured Rock through Unsaturated and Water-saturated Layer; Result of a Pneumatic Gas Injection Test, 11th International Conference on Greenhouse Gas Control Technologies (GHGT11), 2012.11.
44. Ferian Anggara, Kyuro Sasaki, Yuichi Sugai, Geo-sequestration of CO2 in the Coal Seams, with Special References to the Effects of Coal Swelling on the Permeability, 11th International Conference on Greenhouse Gas Control Technologies (GHGT11), 2012.11.
45. Harunobu Suzuki, Kyuro Sasaki, Yuichi Sugai, Composing the Whole CCS System Including CO2 Buffer, 11th International Conference on Greenhouse Gas Control Technologies (GHGT11), 2012.11.
46. Ferian Anggara, Kyuro Sasaki, Yuichi Sugai, Swelling experiments of Kushiro coals in supercritical CO2, The 18th Formation Evaluation Symposium of Japan, 2012.09.
47. OR Chanmoly, Kyuro Sasaki, Yuichi Sugai, Masayuki Makano, Motonao Imai, Characteristics of Micro-bubble Foamy Oil Generation and Distribution, The 18th Formation Evaluation Symposium of Japan, 2012.09.
48. OR Chanmoly, Kyuro Sasaki, Yuichi Sugai, Masanori Nakano, Motonao Imai, Characteristics of CO2 Gas Diffusivity and Solubility in the Crude Oil
, International Symposium on Earth Science and Technology 2012, 2012.09.
49. Yuta Yoshioka, Kyuro Sasaki, Yuichi Sugai, A Kinetic Reaction Model for Bitumen Production from Oil Sands by In-Situ Combustion
, International Symposium on Earth Science and Technology 2012, 2012.09.
50. Zhigang Li, Xiaoming Zhang, Yuichi Sugai, Jiren Wang, Kyuro Sasaki, Coal Gasification in High Pressure and High CO2 Concentration Atmosphere by Rapid Heating, International Symposium on Earth Science and Technology 2012, 2012.09.
51. Harunobu Suzuki, Kyuro Sasaki, Yuichi Sugai, An Evaluation Study on CCS System against Geological Uncertainty and Troubles, International Symposium on Earth Science and Technology 2012, 2012.09.
52. Teruhsia Yamashiro, Very Susanto, Kyuro Sasaki, Yuichi Sugai, A study on leakage monitoring system for CO2 geological storage, Proc. of JAPT Annual Meeting (June, 2012)

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53. Yuta Yoshioka, Kyuro Sasaki, Yuichi Sugai, Simulation of the heavy oil production by in-situ combustion, Proc. of JAPT Annual Meeting (June, 2012)

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54. Haruhiro Suzuki, Kyuro Sasaki, Yuichi Sugai, Composing the whole CCS system including CO2 buffer, Proc. of JAPT Annual Meeting (June, 2012)

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55. Zhigang Li, Xiaoming Zhang, Kyuro Sasaki, Yuichi Sugai, Jiren Wang, Characteristic Analyses of Gasification and Combustion of Different Coal Samples in CO2-Enriched and Recycled Flue Gases Atmosphere by Rapid Heating: Effects of O2 Concentration and H2O, Carbon Management Technology Conference, 2012.02.
56. Ferian Anggara, Kyuro Sasaki, Yuichi Sugai(2012): Experimental and Analytical Studies on Permeability Reduction of Coal Seam by CO2 Injection, International Petroleum Technology Conference 2011 (Bangkok, 7–9 Feb. 2012), IPTC14165., [URL].
57. Interfacial Tension Study of Heavy Oil Emulsion-Carbon Dioxide System by Using Pendant Drop Volume Analysis Method.
58. CO2 Mitigation Opportunities in Iran’s Economic Sectors: Directions and Tools for Air Capture Implementation.
59. An Analytical Model for Gas Production from Methane Hydrate Layer by Depressurization Method.
60. Takafumi Yamakawa, Kyuro Sasaki, Yuichi Sugai, Targeted Methane Hydrate Layer for Economical and Optimum Gas Production, Int. Symp. on Earth Science and Technology 2011 (Fukuoka Japan), 2011.12, The optimum condition of targeted methane hydrate (MH) layer has been studied for gas production using with the Pressurization method. The depressurization method is expect to be applied for the gas production, but MH recovery ratio from the MH layers was simulated to be quite low, because sensible heat can be used for MH dissociation is limited by MH pressure reduction. In considering of the MH reserve condition at the East Nankai Trough area, it has been cleared that the highest production rate and recovery ratio were given at the MH saturation of around 0.1 against the pressure reduction of 4MPa. The gas production peak time was delayed with the MH saturation becomes higher. Its reason is make lower permeability with the MH saturation. Finally the highest saturation value was presented on a plane consisting pressure reduction and temperature difference between reserve temperature and equilibrium temperature against MH reserve pressure..
61. Hiroshi Ando, Kyuro Sasaki, Youhei Kawamura, Hirokazu Okawa, Yuichi Sugai (2011): Development of Viscosity Meter in High Pressure and High Temperature Condition, 17th Formation Evaluation Symposium of Japan (Chiba, Japan), pp.O1-6
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62. Very Susanto, Kyuro Sasaki, Yuichi Sugai, Kazutoshi Sugiyama (2011): Preliminary Study of Surface Monitoring CO2 Dispersion from Shallow Aquifer CO2 Released, 17th Formation Evaluation Symposium of Japan(Chiba, Japan), pp.G1-7
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63. Ferian Anggara, Kyuro Sasaki, Yuichi Sugai (2011): Coal Swelling Experiments and Permeability Reduction on Coal Seam by CO2 Injection, 17th Formation Evaluation Symposium of Japan (Chiba, Japan), pp.H1-6.
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64. Kyuro Sasaki, et al. (2011): Producing "Carbon Free" Energy by Injecting CO2 in to Reservoir, Proc. of Autumn Annual Meeting MMIJ (Sakai, Osaka) (A), pp.209-2012.
65. Sasaki, K. and Sugai, Y.(2011):" Numerical Modelling of Spontaneous Combustion of Coal", Proc. of Autumnl Annual Meating of MMIJ (Sakai, Osaka) (A), pp. 331-314..
66. Arif Widiatmojo, Kyuro Sasaki, Yuichi Sugai, Numerical Simulation Method on Turbulent Gas Diffusion phenomena in Mine Ventilation Network, 22nd World Mining Congress & Expo, 2011.09, [URL].
67. Kyuro Sasaki, Ferian Anggara, Yuichi Sugai, Coal-Matrix Swelling by CO2 Adsorption and A Model of Permeability Reduction, 22nd World Mining Congress & Expo , 2011.09, [URL].
68. Kyuro Sasaki and Yuichi Sugai, Hiroyuki Kono,Takashi Takahashi, Daisuke Ito, Takashi Okabe (2011) : CO2 Solubility in Heavy Oil Related to CO2 Storage,Production Symposium on "The Past and Future of Our Technology for CO₂" , 2014 Technical Meeting of The Japanese Association for Petroleum Technology (Tokyo), June 9th, 2011. .
69. Akira Fujiwara, Kyuro Sasaki, Sinji Ono, Takafumi Yamakawa, Yuichi Sugai (2011),The gas production method from methane hydrate Layer by mixing injection of CO2 and water using horizontal wells, Proc. of 76th JAPT Annual Meeting and Convention, Tokyo (June 9th, 2011) .
70. Yusuke Matsunami, Takafumi Yamakawa, Kyuro Sasaki, Shinji Ono, Yuichi Sugai (2011),Analytical model on gas production from methane hydrate layers by depressurization method, Proc. of 76th JAPT Annual Meeting and Convention, Tokyo (June 9th, 2011) .
71. Takafumi Yamakawa, Kyuro Sasaki, Yuichi Sugai (2010),Effect of gas production from methane hydrate zone by CH4 solubility, Proc. of 76th JAPT Annual Meeting and Convention, Tokyo (June 9th, 2011) .
72. Atsushi Maeda, Shinji Ono, Kyuro Sasaki, Yuichi Sugai (2011),Study on characteristics of mass diffusion in a reservoir of porous medium, Proc. of 76th JAPT Annual Meeting and Convention, Tokyo (June 9th, 2011) .
73. Kyuro Sasaki and Yuichi Sugai, Hiroyuki Kono,Takashi Takahashi, Daisuke Ito, Takashi Okabe (2011) : CO2 Solubility in Heavy Oil Related to CO2 Storage,Production Symposium on "The Past and Future of Our Technology for CO₂" at 76th JAPT Annual Meeting and Convention, Tokyo (June 9th, 2011) .
74. Hiroyuki Kono, Kyuro Sasaki,Yuichi Sugai, Takashi Takahashi, Daisuke Ito, Takashi Okabe, 2011: Oil Drainage by CO2 Gas Diffusion, Dissolution and Foaming in Heavy Oil, World Heavy Oil Congress 2011 (Edmonton, Canada), WHOC11-327..
75. Kyuro Sasaki, Yuichi Sugai, Shinji Ono, Takafumi Yamakawa, 2010, Integrated Thermal System for Gas Production from Methane Hydrate Zone and Generating Electricity, Proc. International Symposium on Methane Hydrate Resources (Tokyo, Japan), p.84.
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76. Takafumi Yamakawa, Shinji Ono, Akinori Iwamoto, Yuichi Sugai, Kyuro Sasaki(2010), A Gas Production System from Methane Hydrate Layers by Hot Water Injection and BHP Control with Radial Horizontal Wells, Canadian Unconventional Resources & International Petroleum Conference (Calgary, Canada), [URL].
77. Zhigang Li, Xiaoming Zhang, Kyuro Sasaki, Yuichi Sugai, Jiren Wang, CO gas generating of coal for low O2 concentration in N 2 or CO2 rich atmosphere by rapid heating, ICMHP-2010 International Conference on Mine Hazards Prevention and Control, 2010.10, In this study, experiments on generating of CO gas from heated coal samples have been carried out by controlling the atmospheric condition in low O 2 concentration in considering sealed goaf areas at underground coal mines. The laser beam was used to make coal temperature over 60°C within few minutes in order to minimize coal oxidation in heating process. The O 2 concentration in atmosphere is controlled by injecting Air, pure N2, pure CO2 or N2-CO2 mixing gases to simulate a sealed area with an inert gas injected. The results of coal weight reduction ratio and CO gas generation by injecting the mixing gases of 80% N2 and 20% CO2, close to flue gas ratio, have showed similar characteristics with that of N2 gas injection. In addition, the generated CO gas concentration was mainly dependent on coal temperature and O2 concentration..
78. Phung Quoc HUY, Kyuro Sasaki, Yuichi Sugai, Nguyen Van Hau(2010), Fundamental Parameters for CO2 Enhanced Coalbed Methane Recovery in Deep And Unminable Coal Seams in Quangninh Coalfield, Vietnam, International Conference on Advanced Mining for Sustainable Development (Ha Long, Vietnum).
79. Position and Direction of CO2 Storage Research in Novel Carbon Resouece Sciences by Kyushu University(in Japanese).
80. Methane Gas production System by Hot Water Injection with Horizontal Wells(in Japanese).
81. Gas production from Methane Hydrate Sediment Layer with using BHP Control (in Japanese).
82. Hiroyuki Kono, Yuichi Sugai, Kyuro Sasaki, Takashi Takahashi, Daisuke Ito and Takashi Okabe(201), The dissolution characteristic of solvent gasses for heavy oil with PVTtest, Proc. 75th JAPT Annual Meeting & Convention, Fukuoka Convention Center, June 9th, 2011..
83. Gas production from Methane Hydrate Sediment Layer with using BHP Control (in Japanese).
84. Kyuro Sasaki (2010) : Special Speach "Observation and Visualization of Flows – What is Darcy’s Law and its Meaning?" , Special Seminar at 75th JAPT Annual Meeting and Convention, Fukuoka Convention Center (June 8th, 2010) .
85. Gas production from Methane Hydrate Sediment Layer by Thermal Stimulation with Hot Water Injection, [URL].
86. Preliminary Measurements of Combustion and Gasification of Coal for Rapid Heating and TG-DTA.
87. The Comparative Studies of Absorption Solutions for CO2 Capture from Coal-fired Power Plant Flue Gas.
88. Preliminary Measurements of Combustion and Gasification of Coal for Rapid Heating.
89. Gas production from Methane Hydrate Sediment Layer with using BHP Control (in Japanese).
90. Evaluation of Food Storage in Unused underground Tunnel (presented in Japanese).
91. Estimation of Thermal Condition in Unused underground Tunnel (presented in Japanese).
92. Coal Matrix Swelling and Decrease of Permeability (presented in Japanese).
93. Kyuro Sasaki, A Thermal Gas Production System from Methane Hydrate Layers by Hot Water Injection, 2010 SPE Oil & Gas India Conference and Exhibition (OGIC2010), 2010.01.
94. An Integration of GIS and ISC3VIEW for Prediction Modeling of CO2 Distribution in Nw Sabalan Geothermal Field.
95. Estimation of the Potential of Microbial EOR by Using Oil-degrading Bacteria, Petrotoga sp. Isolated from an Oilfield.
96. Preliminary Result: CO2 Adsorption Experiments on Indonesia Coal Seam.
97. Screening of Oil-Degrading and Hydrogen-Producing Microorganisms for Microbial Conversion of CO2 into CH4 in Oil Reservoir.
98. Solubility Measurements of Gases into Heavy Oil by PVT Process.
99. Visualization Study on Swelling of Coal Matrix in High Pressure CO2.
100. Experimental Study on Combustion, Gasification and Adsorption of Coal in CO2 Rich Atmosphere.
101. Future Climate Change Prediction by MAGICC/SCENGEN Model: A Case Study of Temperature Change for Tehran Province, Iran.
102. A Comparative Study on Ventilation Efficiency in Dead Spaces Along Mine Airways Based on A Laboratory Model, and Mine Measurement.
103. Discrete Tracer Points Method for Mine Ventilation Network.
104. CO2 Removal from Coal-fired Power Plant Flue Gas by using 4-Diethylamino-2-Butanol (DEAB) Solution.
105. Estimation of the Potential of an Oil-Viscosity-Reducing Bacteria, Petrotoga sp., Isolated from an Oilfield for MEOR.
106. Isty Adhitya Purwasena, Yuichi Sugai, Kyuro Sasaki, The Effect of Nitrogen Sources on Enhancedment of Crude Oil Viscosity Reduction by a Novel Anaerobe Thermophilic Bacteria, Petrotoga sp., 3rd Int. Symp. of Novel Carbon Resource Sciences, 2009.11.
107. Technologies and Solvent Development for CO2 Removal from Coal Fired Power Plant Flue Gas Streams.
108. Flow Visualization and Tracer Gas Measurement for Gas and Particles Diffusion in Dead Spaces along a Mine Ventilation Airway.
109. Gas Adsorption Capacity to Evaluate CO2 Sequestration Potential in Quangninh Coalfield, Vietnam.
110. Numerical Modeling of Diffusion Phenomena in Narrow Vein Mine Stope from Field Measurement and Scaled Laboratory.
111. Simulation of Diffusion using Discrete Points Movement Method and Effect of Dead Space Volume in Mine Ventilation Airways.
112. Gas Hydrate Production System by Hot Water Injection using with Horizontal Wells (presented in Japanese).
113. Characteristics of Gasification and Heat Generation of Coal in CO2 Atmosphere (presented in Japanese).
114. Utilization of Unused Underground Tunnel for Thermal Storage (presented in Japanese).
115. Gas Solubility of Heavy Oil by PVT Measurements (presented in Japanese).
116. Evaluation of CO2 Injectivity around Injector in consideration of Swelling Effect of Coal Seam (presented in Japanese).
117. Gas solubility in heavy oil measured with PVT aparatus (presented in Japanese).
118. Coal permeability change by matrix swelling by CO2 adsorption (presented in Japanese).
119. Usage of Underground Tunnel for Storage (presented in Japanese).
120. TG-DTA Measurements of Coal using Gas Flow Containing High Concentration of CO2.
121. Numerical Modeling for CO2 Matrix Swelling and Permeability Decreasing of Coal Seam .
122. Gas Production System by Hot Water Injection with Horizontal Wells (presented in Japanese).
123. Laboratory Shrincage Stope Model to Study the Effective Turbulent Diffusion Coefficient.
124. Kyuro Sasaki, Two Major Problems of CO2-ECBM Pilot Test Project at Yubari, Japan, 2nd Int ernat ional Symposium of Novel Carbon Resource Science Earth Resource Science and Technology, Institute of Technology Bandung, Indonesia, March 11, 2009. .
125. Phung Quoc Huy, Kyuro Sasaki, Yuichi Sugai, Tran Tu Ba, Evaluation of In-Situ Gas Content and Coalbed Methane Potential in Quangninh Coalfield, Vietnam, 2nd Int ernat ional Symposium of Novel Carbon Resource Science Earth Resource Science and Technology (Bangdung), March 11, 2009..
126. Gabriel Arpa, Kyuro Sasaki And Yuichi Sugai, Numerical Modeling of Diffusion Phenomena in Narrow Vein Mine Stope from Field Measurement and Scaled Laboratory, 2nd Int ernat ional Symposium of Novel Carbon Resource Science Earth Resource Science and Technology(Bangdung), March 11, 2009..
127. Isty A. Purwasena, Yuichi Sugai and Kyuro Sasaki, A Preliminary Study on Microbial Enhanced Oil Recovery using CO2 as A Nutrient Source, 2nd Int ernat ional Symposium of Novel Carbon Resource Science Earth Resource Science and Technology(Bangdung), March 11, 2009..
128. Yuichi Sugai, Toshiya Niimi, Kyuro. Sasaki, Yoshiyuki Hattori, Tsukasa Mukaidani, Kazuhiro Fujiwara and Komei Okatsu, Basic Studies on Oil-Degrading And Hydrogen-Producing Microorganisms for Microbial Conversion of CO2 into CH4 in Oil Reservoir, 2nd Internat ional Symposium of Novel Carbon Resource Science Earth Resource Science and Technology, March 11, 2009..
129. Kyuro Sasaki, Tetsu Yasunami, Yuichi Sugai (2008): Prediction model of Bottom Hole Temperature and Pressure at Deep Injector for CO2 Sequestration to Recover Injection Rate, Proc. of 9th International Conference Green House Gas Control Technologies(GHGT-9)(Wasington D.C.), CD-ROM. .
130. Takashi Fujii, Yuichi Sugai and Kyuro Sasaki (2009): Characteristics of Adsorption, Permeability and Swelling of Coal Relating to Liquid CO2 Sequestration into Coal Seam, Proc. of 9th International Conference Green House Gas Control Technologies(GHGT-9)(Wasington D.C.)..
131. Takashi Fujii, Kyuro Sasaki, Yuichi Sugai and Toshiyuki Hashida(2008): Measurements of CO2 Sorption on Rocks using a Volumetric Technique for CO2 Geological Storage, Proc. of 9th International Conference Green House Gas Control Technologies(GHGT-9)(Wasington D.C.) .
132. Effects of SO2 on CO2 Adsorption Capasity in Coal Seams for ECBM Considering to Flue Gas from Coal-Fired Power Plant (presented in Japanese).
133. Screening of oil-degrading and hydrogen-producing microorganisms for microbial conversion of CO2 into CH4 in oil reservoir (presented in Japanese).
134. Kyuro Sasaki, Spontaneous Combustion of Coal, Third International Symposium on Modern Mining and Safety Technology, 2008.08.
135. Global COE Program on Novel Carbon Resources at Kyushu University.
136. Numerical Temperature Prediction System in Injection Tubing, Bottomhole and Reservoir Condition for Supercritical CO2 injection into Deep Coal Seams (presented in Japanese).
137. Numerical Temperature Prediction System in Injection Tubing, Bottom Hole and Reservoir condition for Supercritical CO2 Injection into Deep Coal Seams.
138. Screening of oil-degrading and Hydrogen-producing Microorganisms for Microbial Conversion of CO2 into CH4 in Ooil Reservoir (presented in Japanese).
139. Effects of Un-homogenuity on Heavy Oil Production from Oilsands using with SAGD (presented in Japanese).
140. Measurement of solvent gas solubility into core samples including oil using PVT analysis equipment (presented in Japanese).
141. Technical Developments to Reduce CO2 Emission agaist Global Warming.
142. Kyuro Sasaki, Shinzi Ono, Yuichi Sugai, Takao Ebinuma, Hideo Narita, Experiments on Gas Production System from Methane Hydrate Layer, 2nd International Workshop and Conference on Earth Resources Technology , 2008.04.
143. Mine Development and Mining Industry of Zambia.
144. Kyuro Sasaki, CO2 Storage, 4th International Symposium on Geological and Earth Resources Engineering , Jogjakarta, Indonesia, Dec. 18, 2007..
145. Diffusion Coefficient In Straight And Curved Airways.
146. Estimating of Coal Permeability Range by Small Area Measrurements with Few Numbers of Core Samples.
147. Study on Efficient Cooling of Rock Mass by Driiled Heat Exchanger Wells.
148. A New concept of Equivalent Oxidation Exposure-time for Low Temperature Spontaneous Combustion of Coal.
149. Kyuro Sasaki, Gas Production System from Methane Hydrates Layers by Hot Water Injection using Dual Horizontal Wells, 8th Canadian International Petroleum Conference, 2007.06.
150. A New Numerical Model for Spontaneous Combustion of Coal in Low Temperature Range.
151. Development of a Micro Flowmeter Measuring both Volumetric Flow Rates of Air-Water Mixture for Measuring Relative Permeabilities (presented in Japanese).
152. The Application of Tracer Gas Method for Mine Ventilation at Pongkor Gold Mine PT Aneka Tambang, Tbk., Indonesia, [URL].
153. Mining Industry in Zambia (Special Lecture @ 2006 Annual Meeting of Kyushu Branch , MMIJ).
154. Kyuro Sasaki, Yuichi Sugai, Kodai KATO, Enhancing SAGD Performance using Additional Steam Injector Into Oil Sands Reservoir with Lateral Shale Stringers, 6th IEA Symposium on Enhanced Oil Recovery, 2005.09.
155. 佐々木 久郎, Enhancement of the Steam-assited Gravity Drainage Process for Heavy Oil Production, Seminar at Earth Engineering Center and Mining Engineering, Columbia University, 1996.09, The experiments on initial stages of steam assisted gravity drainage(SAGD) process have been carried out using two-dimensional scaled reservoir models to investigate its production process and performance. Rising or growing process of the initial steam chamber, its shape and area, and temperature distributions have been visualized by using video and thermal-video pictures. As a drainage mechanism, the relationship between isothermal lines and chamber interface have been presented. The temperature on the interface, where the chamber was expanding, was maintained at almost constant temperature of 80 C. Furthermore, the effect of vertical well spacing between two horizontal wells on oil recovery has been investigated. For the case of usual SAGD, oil production rate increases with increasing vertical well spacing, however the leading time to start oil production by gravity drainage becomes longer. The results show that the well spacing may be a representative length for initial stage of the process. Based on these experimental results, a modified SAGD process by adding intermittent steam injection from the lower production well have been proposed. By applying the modified process, the time to generate near break-through condition between two wells was relatively shorten, and oil production was enhanced at the stage of rising chamber compared with that of usual SAGD process..