A method for identifying coalbed methane co-production interference based on production characteristic curves: A case study of the Zhijin block, western Guizhou, China

作     者：GUO Chen QIN Yong YI Tongsheng CHEN Zhenlong YUAN Hang GAO Junzhe GOU Jiang GUO Chen;QIN Yong;YI Tongsheng;CHEN Zhenlong;YUAN Hang;GAO Junzhe;GOU Jiang

作者机构：College of Geology and EnvironmentXi'an University of Science and TechnologyXi'an 710054China Shaanxi Provincial Key Laboratory of Geological Support for Coal Green ExploitationXi'an 710054China Geological Research Institute for Coal Green MiningXi'an University of Science and TechnologyXi'an 710054China Key Laboratory of CBM Resources and Reservoir Formation ProcessMinistry of EducationChina University of Mining and TechnologyXuzhou 221116China Guizhou Bureau of Coal Geological ExplorationGuiyang 550008China East China Oil&Gas CompanySinopecNanjing 210011China 

出 版 物：《Petroleum Exploration and Development》 (石油勘探与开发（英文版）)

年 卷 期：2022年第49卷第5期

页      面：1126-1137页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 0708[理学-地球物理学] 082002[工学-油气田开发工程] 

基　　金：National Natural Science Foundation of China(42002195) National Science and Technology Major Project(2016ZX05044) National Natural Science Foundation of China(42130802) 

主　　题：coalbed methane multi-seam co-production interlayer interference production indication curve external water internal water discrimination template 

摘      要：Efficient detection of coalbed methane(CBM) co-production interference is the key to timely adjusting the development plan and improving the co-production efficiency. Based on production data of six typical CBM co-production wells in the Zhijin block of western Guizhou Province, China, the production characteristic curves, including production indication curve, curve of daily water production per unit drawdown of producing fluid level with time, and curve of water production per unit differential pressure with time have been analyzed to explore the response characteristics of co-production interference on the production characteristic curves. Based on the unit water inflow data of pumping test in coal measures, the critical value of in-situ water production of the CBM wells is 2 m^(3)/(d·m). The form and the slope of the initial linear section of the production indication curves have clear responses to the interference, which can be used to discriminate internal water source from external water source based on the critical slope value of 200 m^(3)/MPa in the initial linear section of the production indication curve. The time variation curves of water production per unit differential pressure can be divided into two morphological types: up-concave curve and down-concave curve. The former is represented by producing internal water with average daily gas production greater than 800 m^(3)/d, and the latter produces external water with average daily gas production smaller than 400 m^(3)/d. The method and critical indexes for recognition of CBM co-production interference based on the production characteristic curve are constructed. A template for discriminating interference of CBM co-production was constructed combined with the gas production efficiency analysis, which can provide reference for optimizing co-production engineering design and exploring economic and efficient co-production mode.