Volume 35 Issue 5
Sep.  2018
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YANG Li, TANG Qingming, LAN Lin, XIA Haiying, NIU Jing, HUANG Huang. Method of Evaluating Sealability of Shales[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(5): 50-54. doi: 10.3969/j.issn.1001-5620.2018.05.010
Citation: YANG Li, TANG Qingming, LAN Lin, XIA Haiying, NIU Jing, HUANG Huang. Method of Evaluating Sealability of Shales[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(5): 50-54. doi: 10.3969/j.issn.1001-5620.2018.05.010
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Method of Evaluating Sealability of Shales

doi: 10.3969/j.issn.1001-5620.2018.05.010

  • 1. Research Institute of Petroleum Engineering Technology, Sinopec Southwest Oil & Gas Company, Deyang, Sichuan 618000;

  • 2. Sichuan Institute of Industrial Technology, Luojiang, Sichuan 618500

  • Received Date: 2018-06-04
  • Publish Date: 2018-09-30
    Abstract
  • Sealability can be characterized by the change of permeability before and after sealing. As to shales, their permeability is diffcult to measure accurately using regular static permeability measuring methods because of the low porosity and low permeability characteristics of shales. Based on plenty of permeability measuring practices, a method of measuring the permeability of shales with ultra-low permeability was proposed. This method, the so-called transient pressure pulse method, is able to measure permeability to 1×10-7 mD. A shale sealability simulation evaluation instrument has been developed based on the transient pressure pulse method. This instrument is able to accurately measure the change of permeability before and after a low porosity low permeability shale is flooded and sealed. The application of the instrument has to some extent resolved the problem of measuring the permeability of sealed shales, providing technical support to evaluating the shale stability of a well and to the large-scale of shale gas development.

     

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