Volume 37 Issue 3
Jun.  2020
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JIANG Jiwei, LI Jun, LIU Gonghui, LIAN Wei, YANG Hongwei. Numerical Simulation of Failed Bonding between Cement Plug and Casing String in Abandoned Wells Based on Cohesive Element Method[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(3): 351-357. doi: 10.3969/j.issn.1001-5620.2020.03.014
Citation: JIANG Jiwei, LI Jun, LIU Gonghui, LIAN Wei, YANG Hongwei. Numerical Simulation of Failed Bonding between Cement Plug and Casing String in Abandoned Wells Based on Cohesive Element Method[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(3): 351-357. doi: 10.3969/j.issn.1001-5620.2020.03.014
shu

Numerical Simulation of Failed Bonding between Cement Plug and Casing String in Abandoned Wells Based on Cohesive Element Method

doi: 10.3969/j.issn.1001-5620.2020.03.014

  • 1. College of Petroleum Engineering, China University of Petroleum-Beijing, Beijing 102249;

  • 2. School of Petroleum, China University of Petroleum-Beijing At Karamay, Karamay 834000;

  • 3. Beijing University of Technology, Beijing 100192

  • Received Date: 2020-01-29
  • Publish Date: 2020-06-28
    Abstract
  • Failure of bonding between cement plug and casing string in abandoned wells imposes a rigorous challenge to the borehole integrity. A 3D finite element model of cement plug, casing string, cement sheath and formation was established to simulate the stripping process of cement plug-surface of casing in vertical wells, to study the effects of geostress on the evolution of failure of the interface between cement plug and casing string, and to analyze the effects of horizontal geostresses, mechanical parameters of cement plug and the property of the interface on the height of the stripping fractures. The establishment of the 3D finite model takes into account the fluid-solid coupling effect between underground fluids and cement plug and is based on Cohesive element method. It was found in the study that when the horizontal geostresses are uniform, the stripping fractures extend along the entire circumference of the interface and have the same height. When the elastic modulus of the cement plug is reduced from 30 GPa to 1 GPa, the height of the stripping fracture is decreased by 9.3 m. When the critical normal strength is increased from 0.25 MPa to 2.0 MPa, the height of the stripping fracture is reduced by 6.5 m. These data indicate that low elastic modulus and high critical normal strength are beneficial to the mitigation of failure of bonding between cement plug and casing string. When the Poisson's ratio of the cement plug is reduced from 0.35 to 0.10, the height of stripping fracture is reduced only by 2.0 m. When the critical shear strength is increased from 0.5 MPa to 4.0 MPa, the height of stripping fracture is reduced only by 3.3 m, indicating that Poisson's ratio and critical shear strength play a minor role in the failure of the bonding. The model established is believed to be instructive to the optimization of cement slurry composition and techniques for well abandonment.

     

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