CO₂-ECBM simulation study considering Klinkenberg factor state

Authors

SA Zhanyou, School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266520, ChinaFollow
WU Jingbo, School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
YANG Yongliang, School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
ZHANG Xin, School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
LU Shouqing, School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
LIU Jie, School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China
WANG Hao, School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China

Abstract

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.

Keywords

Klinkenberg effect, Klinkenberg factor, CO2-ECBM, permeability, gas pressure, CO2 storage

DOI

10.12363/issn.1001-1986.22.09.0713

Recommended Citation

SA Zhanyou, WU Jingbo, YANG Yongliang, et al. (2023) "CO₂-ECBM simulation study considering Klinkenberg factor state," Coal Geology & Exploration: Vol. 51: Iss. 3, Article 48.
DOI: 10.12363/issn.1001-1986.22.09.0713
Available at: https://cge.researchcommons.org/journal/vol51/iss3/48

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