Volume 33 Issue 3
May  2016
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LIU Jingping, SUN Jinsheng. Borehole Wall Collapse and Control in Shale Gas Well Drilling[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(3): 25-29. doi: 10.3969/j.issn.1001-5620.2016.03.005
Citation: LIU Jingping, SUN Jinsheng. Borehole Wall Collapse and Control in Shale Gas Well Drilling[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(3): 25-29. doi: 10.3969/j.issn.1001-5620.2016.03.005

Borehole Wall Collapse and Control in Shale Gas Well Drilling

doi: 10.3969/j.issn.1001-5620.2016.03.005
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  • Corresponding author: 孙金声,E-mail:sunjinsheng@petrochina.com.cn。
  • Received Date: 2016-03-01
  • Publish Date: 2016-05-31
  • Borehole wall instability in shale gas horizontal drilling is critical to the success of shale gas development in China. Shale samples taken from the Longmaxi formation in the Block 108 in Zhaotong, Yunnan, were studied for their mineral components, micro structures and textures, surface characteristics, swelling and dispersion performances through XRD, SEM, mechanics and wettability analyses, rate of swelling and percent recovery of shale cuttings through hot rolling test. The mechanism governing the collapse of the shale formation studied has been disclosed. This formation, mainly composed of illites, has no montmorillonite and I/S mixed layers, and surface hydration is the main cause for the shale formations to lose their stability. Based on the second law of thermodynamics, a decrease in shale's surface free energy will inhibits the surface hydration of shale. In laboratory studies, long chain alcohols were used to change the wettability of the shales through surface adsorption, thus effectively decreased the surface free energy and inhibited the surface hydration of the shales, and the formation can be stabilized.

     

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