CO2-ECBM simulation study considering Klinkenberg factor state

被引：0

作者：

Sa Z. ^{[1
]}

Wu J. ^{[1
]}

Yang Y. ^{[1
]}

Zhang X. ^{[1
]}

Lu S. ^{[1
]}

Liu J. ^{[1
]}

Wang H. ^{[1
]}

机构：

[1] School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao

来源：

Meitiandizhi Yu Kantan/Coal Geology and Exploration | 2023年 / 51卷 / 03期

关键词：

CO[!sub]2[!/sub] storage; CO[!sub]2[!/sub]-ECBM; gas pressure; Klinkenberg effect; Klinkenberg factor; permeability;

D O I：

10.12363/issn.1001-1986.22.09.0713

中图分类号：

学科分类号：

摘要：

In order to explore the role of Klinkenberg effect and Klinkenberg factor in different states in the process of CO2-Enhanced Coal Bed Methane (CO2-ECBM), the effects of Klinkenberg factor of zero, fixed Klinkenberg factor and dynamic Klinkenberg factor on CO2-ECBM were simulated and analyzed by COMSOL finite element software. The dynamic changes of CH4 and CO2 pressure with this factor were studied, and the CH4 gas production was compared with the engineering practice. The results show that the effective permeability of CH4 and CO2 increases slowly at first, then decreases rapidly and gradually tends to be gentle. Compared with the fixed Klinkenberg factor or Klinkenberg factor of zero, the effective permeability of CH4 and CO2 under the influence of dynamic Klinkenberg factor is larger. When the Klinkenberg factor is a dynamic variable, the effective permeability of CO2 is less than that of CH4 due to the influence of molar mass and dynamic viscosity of different gases. The CH4 pressure in the coal seam decreases faster and the CO2 pressure rises faster. When the Klinkenberg factor is fixed or zero, the CH4 pressure in the coal seam will be overestimated, and the influence range of CH4 extraction and CO2 pressure injection will be underestimated, and the valuation will increase with time. The research results are helpful to analyze the variation trend of effective permeability of CH4 and CO2, estimate the influence range of CH4 extraction and CO2 injection and the gas production of CH4, and have theoretical guiding significance in exploring coal seam permeability, optimizing well pattern layout and quantitatively evaluating gas production of coalfield. © 2023 The authors.

引用

页码：37 / 45

页数：8

共 30 条

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