Production characteristics of normal pressure shale gas in Pengshui-Wulong area,southeast Chongqing
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    Abstract:

    The Wufeng and Longmaxi Formation in Pengshui-Wulong area of southeast Chongqing is a normal pressure formation. The geological characteristics and production characteristics of normal pressure shale gas were systematically analyzed based on field geological survey,observation of cores from shale wells,shale tests,and production data of 5 normal pressure shale gas wells. The Wufeng and Longmaxi Formation in Pengshui-Wulong area was deposited in deep continental shelf with large thickness(more than 20 meters),high total organic carbon content(about 2%-6%),high siliceous content(more than 45%),medium physical property(porosity 2%-5%),micro-fissure development,medium preservation condition and normal pressure(formation pressure coefficient 0.8-1.2). According to the characteristics of flowback,fluid properties,production and pressure variation in the process of shale gas well production in Pengshui-Wulong area,the normal pressure shale gas has three production modes-natural flowing,induced flowing and artificial lifting. Three stages can be divided as low gas-liquid ratio stage,two-phase transition stage and stable production stage. Entering the stable production stage,the normal pressure shale gas has the characteristics of low initial production and slow decline rate.

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HE Xipeng, ZHANG Peixian, FANG Dazhi, MEI Junwei, HE Guisong, LU Bi. Production characteristics of normal pressure shale gas in Pengshui-Wulong area,southeast Chongqing[J]. Petroleum Geology and Recovery Efficiency,2018,25(5):72~79

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  • Online: September 13,2018
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