Volume 33 Issue 2
Mar.  2016
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2016  >  33(2): 31-35
LIU Jingping, SUN Jinsheng. Effects of Drilling Fluid Activity on Hydration and Dispersion of Formation Rocks in Shale Gas Drilling in Chuan-Dian Area[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(2): 31-35. doi: 10.3969/j.issn.1001-5620.2016.02.007
Citation: LIU Jingping, SUN Jinsheng. Effects of Drilling Fluid Activity on Hydration and Dispersion of Formation Rocks in Shale Gas Drilling in Chuan-Dian Area[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(2): 31-35. doi: 10.3969/j.issn.1001-5620.2016.02.007
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Effects of Drilling Fluid Activity on Hydration and Dispersion of Formation Rocks in Shale Gas Drilling in Chuan-Dian Area

doi: 10.3969/j.issn.1001-5620.2016.02.007
  • 1.

    Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China

  • 2. CNPC Drilling Research Institute, Beijing 102206, China

More Information
  • Corresponding author: 孙金声,E-mail:sunjinsheng@petrochina.com.cn
  • Received Date: 2016-01-25
  • Publish Date: 2016-03-31
    Abstract
  • Reducing the activity ofthe filtrate of drilling fluid is an important technology in mitigating shale problems during drilling.In shale gas drilling in the Chuan-Dian area,highly water sensitive clayey formations with fractures highly developed have been frequently encountered,necessitating the means of borehole wall stabilization.Linear swelling and hot rolling tests using a drilling fluid formulated with CaCl2,potassium formate and glyceryl alcohol as the activity agents,and shale samples from Longmaxi formation (Yibin,Sichuan) and Wufeng formation (Yibin,Sichuan) show that the activity of the drilling fluid has played a slight role in the hydration and dispersion of the shales,indicating that osmotic hydration of the shales is not the main cause for the shale formations to collapse.Surface hydration,capillary pressure as well as the micro fractures developed in the shale formations may have been causing the shale formation to collapse.

     

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    • References(10)
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