Volume 37 Issue 6
Dec.  2020
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DING Jiadi, SHEN Jiyun, ZHANG Shuo, JI Hongfei, WANG Linlin. A Failure Criterion of Oil Well Set Cement Based on Porous Media Theory[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(6): 763-770. doi: 10.3969/j.issn.1001-5620.2020.06.015
Citation: DING Jiadi, SHEN Jiyun, ZHANG Shuo, JI Hongfei, WANG Linlin. A Failure Criterion of Oil Well Set Cement Based on Porous Media Theory[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(6): 763-770. doi: 10.3969/j.issn.1001-5620.2020.06.015
shu

A Failure Criterion of Oil Well Set Cement Based on Porous Media Theory

doi: 10.3969/j.issn.1001-5620.2020.06.015

  • 1. China Oilfield Services Ltd. COSL Oilfield Chemicals, Sanhe, Hebei, 065201;

  • 2. CNPC engineering Technology R&D company limited, Beijing 100101;

  • 3. China university of petroleum, Beijing 100083

  • Received Date: 2020-09-15
  • Publish Date: 2020-12-28
    Abstract
  • Set cement is a porous medium comprising cement skeleton and pores. When becoming solidified after hydration, the set cement in a well still has free water in its pores, and the free water is connected with fluid in the formations. Hence, the mechanical behavior of a set cement is influenced by the pore pressure of the formation and the external loads. To further reveal the mechanical performance of set cement in actual working conditions, triaxial mechanical experiment was conducted on set cement based on the guidance of the theory of porous media mechanics. Data obtained from the experiments were used to determine the Mohr-Coulomb failure criteria taking into account the pore water pressure. The experiments were conducted on Jiahua oil well cement. By changing the confining pressure, water drain conditions and pore water pressure, various mechanical parameters of the set cement were obtained. It was found from the experimental results that the pore water pressure is an important factor affecting the failure strength of the set cement. The Mohr-Coulomb criteria model not taking into account the porous media mechanics of the set cement are non-linear, while the Mohr-Coulomb envelope taking into account the porous media mechanics of the set cement are linear, from which the criterion formulae were calculated.

     

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