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《Journal of China Coal Society》 2013-02
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Key geologic factors and control mechanisms of water production and gas production divergences between CBM wells in Fanzhuang block

LIU Shi-qi1,SANG Shu-xun1,LI Meng-xi2,LIU Hui-hu3,HUANG Hua-zhou1,ZHANG Jie-fang1,XU Hong-jie3(1.School of Mineral Resource and Geoscience,Key Laboratory of CBM Resources and Reservoir Strata Process,State Ministry of Education,China University of Mining and Technology,Xuzhou 221116,China;2.Shanxi CBM Branch,Huabei Oilfield Company,Jincheng 048000,China;3.School of Geoscience and Environment,Anhui University of Science and Technology,Huainan 232001,China)  
Production characteristics of coal bed methane(CBM) wells in Fanzhuang block were studied.Geologic factors that affect divergences of water production and gas production between CBM wells were analyzed on the basis of geologic information and production data of 16 CBM wells.Geologic control mechanisms of the divergences were further studied.The results show that,in well dewatering stage,ground water fluid potential controls water production of CBM wells by affecting the flow directions of water and moisture content of coal bed reservoir.Permeability controls water production by affecting the flow capacity of water in coal bed.The negative correlation between ground water fluid potential and permeability accelerates the divergences of water production between CBM wells.In gas production stage,the decompression effect controls the divergences of water production and gas production by affecting the amount of desorption methane,saturation degree and effective permeability of water and gas in coal bed.If adjacent CBM wells are connected,gas/ water separation in coal bed further accelerates the divergences of water production and gas production between CBM wells.
【Fund】: 国家自然科学基金资助项目(41272154) 国家自然科学基金青年科学基金资助项目(51104148)
【CateGory Index】: TD84
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