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Evaluation of infill well pattern based on the dynamic change of reservoirs during coalbed methane development

Frontiers of Earth Science 2023年第3期17卷 646-660页

作者： Qian ZHANG Shuheng TANGI Songhang ZHANG Xinlu YAN Kaifeng WANG Tengfei JIA Zhizhen WANG School of Energy Resources China University of Geosciences(Beijing)Beijing 100083China Coal Reservoir Laboratory of National Engineering Research Center of CBM Development&Utilization Beijing 100083China Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering Beijing 100083China College of Mining Technology Taiyuan University of TechnologyTaiyuan 030024China

With the deepening of coalbed methane(CBM)exploration and development,the problem of low gas production has gradually become one of the main factors restricting the development of the CBM industry in *** well pattern deployment can improve the productivity of CBM wells and reduce the cost of production,while the reservoir changes of CBM wells play a important role for well pattern *** this study,the dynamic characteristics of the average reservoir pressure(ARP),permeability,and drainage radius during the development process of CBM wells are systematically analyzed,and predicted the production changes of well groups before and after infilling wells in combination with the characteristics of reservoir *** results show that the high gas production wells have a larger pressure drop,long drainage radius,and a large increase in *** the contrary,low gas production wells are characterized by small drainage radius,damaged permeability and difficult to *** productivity of infilled horizontal wells is predicted for two well groups with different productivity and reservoir dynamic *** infilling wells,the production of current wells has increased at different *** is predicted that the average gas production of low gas production well group H1 and middle gas production well group H2 will increase 1.64 and 2.09 times respectively after 3000 days production *** addition,the pressure interference between wells has increased significantly,and the overall gas production of the well group has greatly *** wells can achieve better development results in areas with superior CBM resources,recoverable reservoir permeability,and small drainage radius during the early production *** research results provide a reference for the later infill adjustment of CBM well patterns in the study area.

关键词： well pattern optimization reservoir dynamic variation infill well deployment coalbed methane Qinshui Basin

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