Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (5): 181-188.doi: 10.12108/yxyqc.20210518

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles    

A fully coupled fluid flow and geomechanics model for enhanced coalbed methane recovery

WEI Zhijie1,2, KANG Xiaodong1,2   

  1. 1. State Key Laboratory of Offshore Oil Exploitation, Beijing 100028, China;
    2. CNOOC Research Institute Co., Ltd., Beijing 100028, China
  • Received:2021-03-12 Revised:2021-04-29 Online:2021-10-01 Published:2021-09-30

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Abstract: In order to capture the complicated geomechanical effects more accurately during enhanced coalbed methane recovery, a fully coupled fluid flow and geomechanics model was proposed for ECBM and CO2 underground storage with consideration of multi-component, multi-phase, multi-process transportation in porous media, which consist of poroelastic geomechanical model and full component fluid-flow model. The corresponding numerical solver was developed by the fully implicit finite difference method. The fully coupled model and algorithm was applied to make a systematic comparison and analysis with the commonly used commercial ECBM/CBM software, and to historical match field data of an enhanced CBM recovery pilot by flue gas injection in FBV 4 A. The results show that the model proposed can more accurately capture the fully coupling effects of geomechanics and fluid flow and multi-component multi-process migration in coal seam, which can provide better prediction of reservoir properties and CBM production, indicating its value in field application.

Key words: coalbed methane, enhanced recovery, coupled fluid flow and geomechanics, geomechanics effect, matrix swelling/shrinkage

CLC Number: 

  • TE357
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