Numerical modeling of the dynamic variation in multiphase CH4 during CO2 enhanced gas recovery from depleted shale reservoirs
Jun LIU1,2(), Ye ZHANG1, Lijun CHENG1, Zhaohui LU1, Chunlin ZENG1, Peng ZHAO3()
1. Key Laboratory of Shale Gas Exploration (Ministry of Natural Resources), Chongqing Institute of Geology and Mineral Resources, Chongqing 401120, China 2. Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China 3. College of Architecture and Environment, Sichuan University, Chengdu 610065, China
Regarding CO2 enhanced shale gas recovery, this work focuses on changes in the multiphase (free/adsorbed) CH4 in the process of CO2 enhanced shale gas recovery, by utilizing a rigorous numerical model with real geological parameters. This work studies nine injection well (IW) and CH4 production well (PW) combinations of CO2 to determine the influence of IW and PW locations on the dynamic interaction of multiphase CH4 during 10000 d of CO2 injection. The results indicate that the content of both the adsorbed CH4 and free CH4 is strongly variable before (and during) the CO2-CH4 displacement. In addition, during the simulation process, the proportion of the adsorbed CH4 among all extracted CH4 phases dynamically increases first and then tends to stabilize at 70%–80%. Moreover, the IW-PWs combinations significantly affect the outcomes of CO2 enhanced shale gas recovery – for both the proportion of adsorbed/free CH4 and the recovery efficiency. A longer IW-PW distance enables more adsorbed CH4 to be recovered but results in a lower efficiency of shale gas recovery. Basically, a shorter IW-PWs distance helps recover CH4 via CO2 injection if the IW targets the bottom layer of the Wufeng-Longmaxi shale formation. This numerical work expands the knowledge of CO2 enhanced gas recovery from depleted shale reservoirs.
. [J]. Frontiers of Earth Science, 2021, 15(4): 790-802.
Jun LIU, Ye ZHANG, Lijun CHENG, Zhaohui LU, Chunlin ZENG, Peng ZHAO. Numerical modeling of the dynamic variation in multiphase CH4 during CO2 enhanced gas recovery from depleted shale reservoirs. Front. Earth Sci., 2021, 15(4): 790-802.
Thermal conduction coefficient of shale (ls, W/(m·K))
0.1913
Henry’s coefficient of CH4 (Hg1)
0.0014
Thermal conduction coefficient of CH4 (lg1, W/(m·K))
0.0301
Henry’s coefficient of CO2 (Hg2)
0.0347
Thermal conduction coefficient of CO2 (lg2, W/(m·K))
0.0137
Residual gas saturation (sgr)
0.05
Thermal conduction coefficient of water (lw, W/(m·K))
0.5985
Irreducible water saturation (swr)
0.42
Isosteric heat of CH4 adsorption (qst1, kJ/mol)
16.4
Reference temperature for test (Tref, K)
300
Isosteric heat of CO2 adsorption (qst2, kJ/mol)
19.2
Tab.2
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