Volume 32 Issue 5
Sep.  2015
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YANG Zhenjie, FENG Jingjing, LIAO Tao, MA Chengyun, WU Xingxing. Study on Self-healing Mechanism of Self-healing Prepad Fluid for Well Cementing[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(5): 61-65. doi: 10.3969/j.issn.1001-5620.2015.05.015
Citation: YANG Zhenjie, FENG Jingjing, LIAO Tao, MA Chengyun, WU Xingxing. Study on Self-healing Mechanism of Self-healing Prepad Fluid for Well Cementing[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(5): 61-65. doi: 10.3969/j.issn.1001-5620.2015.05.015
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Study on Self-healing Mechanism of Self-healing Prepad Fluid for Well Cementing

doi: 10.3969/j.issn.1001-5620.2015.05.015

  • No. 18 DianziEr Lu Dongduan, Xi'an, Shaanxi 710065, China

  • Received Date: 2015-04-10
  • Publish Date: 2015-09-30
    Abstract
  • Cylindrical sliced set cement slurry sample (water cement ratio of 0.44) aged in steel pipe were placed in clear water and self-healing prepad fluid for ageing. Using X-ray instrument, the aged slice samples were tested for their anti-channeling capacity and analyzed for their micro structures and composition of hydration product. The Ca(OH)2 content of the samples were measured with TG/TGA method. Using mercury porosimeter, the pore structure of the samples were analyzed. ESEM was finally used to survey the microscopic topography. It was concluded that the prepad fluid can infiltrate into the micro-fractures of the samples, where the prepad fluid reacted with the Ca(OH)2 and nonhydrated cement existed there to form hydrated product, thus realizing self-healing. The prepad fluid also infiltrate into the pores of the main body of the samples to activate hydration reaction, producing hydrated calcium silicate gel which can fill the pores in the main body, thus strengthening the main body and enhancing its ability to counter filtration and damage. The study is of importance in the application of self-healing prepad fluid, and for the success of well cementing.

     

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