Volume 38 Issue 4
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KANG Yuan, SUN Jinsheng, LYU Kaihe, et al.Research on a water-based drilling fluid for shale gas drainage and strong blocking[J]. Drilling Fluid & Completion Fluid，2021, 38（4）：442-448 doi: 10.3969/j.issn.1001-5620.2021.04.007
Citation: KANG Yuan, SUN Jinsheng, LYU Kaihe, et al.Research on a water-based drilling fluid for shale gas drainage and strong blocking[J]. Drilling Fluid & Completion Fluid，2021, 38（4）：442-448 doi: 10.3969/j.issn.1001-5620.2021.04.007
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Research on A Water-based Drilling Fluid for Shale Gas Drainage and Strong Blocking

doi: 10.3969/j.issn.1001-5620.2021.04.007
  • 1.

    School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580

  • 2.

    CNPC Engineering Technology R&D Company Limited, Changping, Beijing 10206

  • Received Date: 2021-03-10
    Available Online: 2023-11-09
  • Publish Date: 2021-07-31
    Abstract
  • The shale formation of the Longmaxi Formation in Sichuan is highly water sensitive,with micro-cracks and cracks developed. During the drilling process, the shaft wall collapsed frequently,which severely restricted the efficient development of shale gas.In order to solve the above problems, this paper introduces a hydrophobically modified silica plugging agent that can not only inhibit shale hydration expansion and dispersion, but also block pores,micro-cracks and cracks, and make the shale surface hydrophobic.And with the core of the plugging agent, combined with fluid loss additives, lubricants, etc., a hydrophobic and strong plugging water-based drilling fluid was studied. The drilling fluid not only has good rheology and fluid loss reduction properties, but also has excellent inhibition, plugging,hydrophobic and anti-pollution capabilities. The shale recovery rate of the drilling fluid is 90.2%, the penetration depth into the 40-60 mesh sand bed is only 1.5 cm, and the high temperature and high pressure filtration loss is 7.2 mL when the density is 2.2 g/cm3.

     

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