Optimization Method of Production System for Coalbed Methane Wells throughout Life Cycle

Chen Li (), Lichun Sun, Zhigang Zhao, Jian Zhang, Cunwu Wang, Gang Lei, Yong Li and Yanjun Meng
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Chen Li: CNOOC Research Institute Ltd., CNOOC Building, Yard 6, Taiyanggong South Street, Chaoyang District, Beijing 100028, China
Lichun Sun: CNOOC Research Institute Ltd., CNOOC Building, Yard 6, Taiyanggong South Street, Chaoyang District, Beijing 100028, China
Zhigang Zhao: CNOOC Research Institute Ltd., CNOOC Building, Yard 6, Taiyanggong South Street, Chaoyang District, Beijing 100028, China
Jian Zhang: CNOOC Research Institute Ltd., CNOOC Building, Yard 6, Taiyanggong South Street, Chaoyang District, Beijing 100028, China
Cunwu Wang: CNOOC Research Institute Ltd., CNOOC Building, Yard 6, Taiyanggong South Street, Chaoyang District, Beijing 100028, China
Gang Lei: Faculty of Engineering, China University of Geosciences Wuhan, 388 Lumo Road, Wuhan 430074, China
Yong Li: College of Geosciences and Surveying Engineering, China University of Mining & Technology, No. 11, Xueyuan Road, Haidian District, Beijing 100091, China
Yanjun Meng: College of Mining Engineering, Taiyuan University of Technology, No. 79 Yingze Xi Street, Wanbolin District, Taiyuan 030002, China

Energies, 2024, vol. 17, issue 4, 1-22

Abstract: Different from conventional gas reservoirs, the permeability of coalbeds is affected by stress sensitivity and matrix shrinkage during production. These two conditions lead to lower permeability in the reservoir and affect the production efficiency of the gas well. In addition, coalbed methane wells have single-phase water flow in the initial stage of production. When the reservoir pressure is reduced to its critical desorption pressure, the adsorbed gas in the reservoir desorbs into the pore space and participates in the flow. The flow state in the reservoir changes from single-phase to two phase, and the permeability of the reservoir decreases. The occurrence of these three damage mechanisms is related to the flow rate of fluid in the reservoir. At present, there is a lack of research on the optimization of drainage and production systems considering the damage mechanism of coal reservoirs. This study comprehensively considers how to optimize the production rate of coal reservoirs under the influence of stress sensitivity, matrix shrinkage and two phase flow in the production process to achieve the purpose of production with the least damage to the reservoir.

Keywords: coalbed gas; production optimization; damage mechanism; stress sensitivity; coal powder deposition (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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