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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Chen Li & Lichun Sun & Zhigang Zhao & Jian Zhang & Cunwu Wang & Gang Lei & Yong Li & Yanjun Meng, 2024. "Optimization Method of Production System for Coalbed Methane Wells throughout Life Cycle," Energies, MDPI, vol. 17(4), pages 1-22, February.
  • Handle: RePEc:gam:jeners:v:17:y:2024:i:4:p:789-:d:1334666
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