Volume 33 Issue 4
Jul.  2016
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SONG Bitao, MA Chengyun, XU Tongtai, XU Hao, HE Zhumei, PENG Fangfang, ZENG Ganlin. Methods for Evaluating the Performance of Drilling Fluids Plugging Fractures in Hard and Brittle Shales[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(4): 51-55. doi: 10.3969/j.issn.1001-5620.2016.04.010
Citation: SONG Bitao, MA Chengyun, XU Tongtai, XU Hao, HE Zhumei, PENG Fangfang, ZENG Ganlin. Methods for Evaluating the Performance of Drilling Fluids Plugging Fractures in Hard and Brittle Shales[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(4): 51-55. doi: 10.3969/j.issn.1001-5620.2016.04.010

Methods for Evaluating the Performance of Drilling Fluids Plugging Fractures in Hard and Brittle Shales

doi: 10.3969/j.issn.1001-5620.2016.04.010
  • Received Date: 2016-05-25
  • Publish Date: 2016-07-31
  • Methods for evaluating the performance of drilling fluids plugging fractures in hard and brittle formations have been surveyed and four methods were chosen for comparison based on the characteristics of hard and brittle shales. It was found that the HTHP filter loss can be used to characterize the osmotic property of mud cakes. The HTHP sand bed and permeability plugging tester (PPT) methods can be used to evaluate the capability of drilling fluids to plug the fixed fractures or pore throats with sizes in nanometer ranges, but they are not suitable for evaluating the performance of nanometer plugging agents, nor can they be used to evaluate the performance of plugging agents to plug fractures or pore throats that have changed during the interaction between drilling fluid and shales. The pressure transmission experiment, on the other hand, canbe used to evaluate the performance of all kinds of plugging agents to plug the fractures or pore throats in hard and brittle rocks, it is also used to test the performance of these plugging agents in plugging fractures or pore throats with sizes changed by the reaction of drilling fluid with shales.

     

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