The experimental research on spontaneous flowbackrelieving aqueous phase trapping damage in shale gas reservoirs

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  • 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;
    2.Rich as Oil and Gas Limited Company,Panjin 124013,China

Received date: 2016-10-19

  Revised date: 2017-05-19

  Online published: 2017-06-10

Abstract

Horizontal well staged fracturing is the main technical means of shale gas reservoir reformation.The flowback rate of fracturing fluid is low in shale gas reservoir.The retained fracturing fluid in nanopore and microcrack seriously affects the desorption-diffusion-permeability of shale gas.Spontaneous imbibition and flowback experiment swere carried out on the shale of Longmaxi Formation in the eastern Sichuan Basin to reveal the characteristics of fracturing fluid flowing back and the change of aqueous phase trapping damage.The effects of pore structure,fracture,flowback pressure and time on spontaneous imbibition and flowback behavior were evaluated.Results show that,the smaller the pore radius,the greater the capillary force,the higher the spontaneous imbibition rate and the poorer the flowback effect.Aqueous phase spontaneous imbibition can induce cracks in shale,which increased the channel of permeability and promoted aqueous phase flowback.Flowback pressure and flowback time have a positive correlation with the flowback effect of aqueous phase,and after 24 hours of flowback,the maximum flowback rate is 46% and permeability recovery rate is 67%.This paper draws the conclusion that,the potential aqueous phase trapping damage of shale gas reservoirs is severe,and reduce aqueous phase in shale benefits to improve permeability of shale gas.

Cite this article

Kang Yi-li,Zhang Xiao-yi,You Li-jun,Chen Qiang,Zhang Du-jie,Cui Zhong-yu . The experimental research on spontaneous flowbackrelieving aqueous phase trapping damage in shale gas reservoirs[J]. Natural Gas Geoscience, 2017 , 28(6) : 819 -827 . DOI: 10.11764/j.issn.1672-1926.2017.05.009

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