岩性油气藏 ›› 2021, Vol. 33 ›› Issue (5): 181–188.doi: 10.12108/yxyqc.20210518

• 油气田开发 • 上一篇    

煤层气藏强化采收全流固耦合模型

未志杰1,2, 康晓东1,2   

  1. 1. 海洋石油高效开发国家重点实验室, 北京 100028;
    2. 中海油研究总院有限责任公司, 北京 100028
  • 收稿日期:2021-03-12 修回日期:2021-04-29 出版日期:2021-10-01 发布日期:2021-09-30
  • 第一作者:未志杰(1984-),男,博士,高级工程师,主要从事海上油气田提高采收率方面的研究工作。地址:(100028)北京市朝阳区太阳宫南街6号院中海油大厦B座710室。Email:weizj1985@163.com。
  • 基金资助:
    “十三五”国家重大科技专项“海上油田化学驱油技术”（编号：2016ZX05025-003）资助

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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摘要： 为了准确表征煤层注气强化采收过程中复杂的地质力学效应，同时考虑多孔介质、多相、多组分、多过程物质运移特征，构建了适用于强化煤层气采收（ECBM）与CO2地质埋存的全流固耦合数学模型，开发了基于全隐式有限差分的数值模拟算法，进而应用该模型与目前常用煤层气模拟软件进行了系统对比和剖析，并对加拿大FBV 4 A井注烟道气强化采收矿场试验开展了历史拟合。结果表明，所构建的全流固耦合模型能够更加准确地表征煤层注气强化采收过程中复杂的流固耦合作用及流体多组分、多过程运移规律，可准确预测储层孔渗等物性参数变化及煤层气产能，具有较高的矿场应用价值。

关键词: 煤层气, 强化采收, 流固耦合, 地质力学效应, 基质膨胀/收缩

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

中图分类号: 

  • TE357
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