Numerical Simulation of Gas Production and Reservoir Stability during CO 2 Exchange in Natural Gas Hydrate Reservoir

Qingping Li, Shuxia Li (), Shuyue Ding, Zhenyuan Yin, Lu Liu and Shuaijun Li
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Qingping Li: State Key Laboratory of Natural Gas Hydrates, Technology Research Department CNOOC Research, Beijing 100192, China
Shuxia Li: Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China
Shuyue Ding: Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China
Zhenyuan Yin: Institute for Ocean Engineering, Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
Lu Liu: Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China
Shuaijun Li: Institute for Ocean Engineering, Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China

Energies, 2022, vol. 15, issue 23, 1-17

Abstract: The prediction of gas productivity and reservoir stability of natural gas hydrate (NGH) reservoirs plays a vital role in the exploitation of NGH. In this study, we developed a THMC (thermal-hydrodynamic-mechanical-chemical) numerical model for the simulation of gas production behavior and the reservoir response. The model can describe the phase change, multiphase flow in porous media, heat transfer, and deformation behavior during the exploitation of NGH reservoirs. Two different production scenarios were employed for the simulation: depressurization and depressurization coupled with CO 2 exchange. The simulation results suggested that the injection of CO 2 promotes the dissociation of NGH between the injection well and the production well compared with depressurization only. The cumulative production of gas and water increased by 27.88% and 2.90%, respectively, based on 2000 days of production simulation. In addition, the subsidence of the NGH reservoir was lower in the CO 2 exchange case compared with the single depressurization case for the same amount of cumulative gas production. The simulation results suggested that CO 2 exchange in NGH reservoirs alleviates the issue of reservoir subsidence during production and maintains good reservoir stability. The results of this study can be used to provide guidance on field production from marine NGH reservoirs.

Keywords: natural gas hydrate; numerical simulation; CO 2 exchange; depressurization; reservoir stability (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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