Volume 35 Issue 2
Mar.  2018
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GUO Xinyang, BU Yuhuan, LI Qiang. Effects of Properties of Expansive Cement on Wellbore Integrity under Changing Casing Internal Pressure[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(2): 98-103. doi: 10.3969/j.issn.1001-5620.2018.02.016
Citation: GUO Xinyang, BU Yuhuan, LI Qiang. Effects of Properties of Expansive Cement on Wellbore Integrity under Changing Casing Internal Pressure[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(2): 98-103. doi: 10.3969/j.issn.1001-5620.2018.02.016

Effects of Properties of Expansive Cement on Wellbore Integrity under Changing Casing Internal Pressure

doi: 10.3969/j.issn.1001-5620.2018.02.016
  • Received Date: 2017-11-05
  • Publish Date: 2018-03-30
  • The effects of the properties of expansive cement on wellbore integrity have been studied using finite element method based on elastic mechanics theory. The study shows that cement with appropriate rate of expansion will reduce the maximum Mises stress inside casing. The higher the rate of expansion of cement, the higher the maximum Mises stress in side cement sheath, and the lower the maximum circumferential stress. When pressure exists inside casing, the higher the elastic modulus of the expansive cement, the lower the maximum Mises stress inside casing, and the higher the maximum Mises stress inside cement sheath. At lower casing pressure, the higher the elastic modulus of cement, the lower the maximum circumferential stress inside cement sheath, contrary to the situation in which the casing pressure is higher. The effects of Poisson ratio on the maximum Mises stress inside casing are lower. The higher the Poisson ratio of cement, the lower the maximum Mises stress and the maximum circumferential stress inside cement sheath. Similar pattern of the effects of the properties of expansive cement on the integrity of wellbore is found for elastic formations and creep formations. Under the circumstance of changing casing pressure, the properties of expansive cement exert greater influences on the compressive failure and circumferential tensile failure of cement sheath. These conclusions suggest that, in selecting expansive cement, the properties of the expansive cement should be taken into account, based on the actual application requirements.

     

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