TY - JOUR
T1 - Numerical study on enhanced gas recovery from methane hydrate reservoir during in-situ heating process by acid injection
AU - Sakamoto, Yasuhide
AU - Kaneko, Fuyuki
AU - Nakano, Yusuke
AU - Nakamura, Kengo
AU - Komai, Takeshi
N1 - Funding Information:
This study was financially supported by the Research Consortium for Methane Hydrate Resources in Japan (MH21 Research Consortium) planned by the Ministry of Economy, Trade and Industry (METI). The authors thank the entire personnel related to MH21 Research Consortium.
Publisher Copyright:
© by The International Society of Offshore and Polar Engineers.
PY - 2019/9
Y1 - 2019/9
N2 - In this study, under the concept of effective utilization of heat generation resulting from mineral dissolution via acid injection for the promotion of in-situ dissociation of methane hydrate (MH) and the enhancement of gas recovery, we conducted a series of numerical analyses of the acid injection process as a secondary gas recovery from an MH reservoir after the depressurization operation. For the numerical analysis, based on the assumption that the charge balance in the injected acid solution after the contact with the solid matrix becomes neutral as a result of mineral dissolution into the water phase, two acid components before and after the contact with the solid matrix were defined. In addition, the kinetic parameters and heat of mineral dissolution during the acid injection were obtained through laboratory column tests and differential scanning calorimetry (DSC) analysis, respectively, and introduced into the developed numerical model. From the calculation results, it was found that the high-temperature zone formed because of heat generation resulting from mineral dissolution extended to the side of the production well promoting MH dissociation, and the total gas recovery through depressurization and acid injection was estimated at approximately 90%.
AB - In this study, under the concept of effective utilization of heat generation resulting from mineral dissolution via acid injection for the promotion of in-situ dissociation of methane hydrate (MH) and the enhancement of gas recovery, we conducted a series of numerical analyses of the acid injection process as a secondary gas recovery from an MH reservoir after the depressurization operation. For the numerical analysis, based on the assumption that the charge balance in the injected acid solution after the contact with the solid matrix becomes neutral as a result of mineral dissolution into the water phase, two acid components before and after the contact with the solid matrix were defined. In addition, the kinetic parameters and heat of mineral dissolution during the acid injection were obtained through laboratory column tests and differential scanning calorimetry (DSC) analysis, respectively, and introduced into the developed numerical model. From the calculation results, it was found that the high-temperature zone formed because of heat generation resulting from mineral dissolution extended to the side of the production well promoting MH dissociation, and the total gas recovery through depressurization and acid injection was estimated at approximately 90%.
KW - Acid injection
KW - Dissociation
KW - Enhanced gas recovery
KW - In-situ heat generation
KW - Methane hydrate
KW - Simulation
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U2 - 10.17736/ijope.2019.jc744
DO - 10.17736/ijope.2019.jc744
M3 - Article
AN - SCOPUS:85075674608
VL - 29
SP - 347
EP - 358
JO - International Journal of Offshore and Polar Engineering
JF - International Journal of Offshore and Polar Engineering
SN - 1053-5381
IS - 3
ER -