Natural Gas Geoscience

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Effective stress characteristics in shale and its effect on productivity

Zhu Wei-yao,Ma Dong-xu
 
  

  1. School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China
  • Received:2017-12-14 Revised:2018-05-18 Online:2018-06-10 Published:2018-06-10

Abstract: Research of effective stress characteristics on the productivity of shale gas has great significance.The samples of the black shale and bedding shale of the Lower Silurian Longmaxi Formation in Sichuan gas field are selected,the microscopic pore structure characteristics are described by scanning electron microscopy,effective stress coefficient is measured by the Cross-plotting method.The experimental results show that the effective stress coefficient of black shale is 0.29 on average and the bedding shale is 0.71.There are microfractures in bedding shale,pore pressure has greater influence on bedding shale.Fitting the relationship between effective stress and permeability by exponential function,the stress sensitivity constants of black shale and bedding shale are 0.268MPa-1and 0.355MPa-1.The stress sensitivity of bedding shale is stronger.On the basis of experiment,the productivity model of fractured horizontal well is established.The results show that microcrack developed reservoir is greatly influenced by the stress,the production pressure should be controlled properly for the high production well.The sizes of matrix block and microcrack have a great influence on the recovery.For the reservoirs with microcrack development and large blocks,bottom-hole pressure should be controlled to improve the recovery.

Key words: Shale gas, Micro-fracture, Effective stress coefficient, Productivity, Fracture network

CLC Number: 

  • TE132.2


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