Volume 38 Issue 2
Aug.  2021
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ZHANG Xiaocheng, LI Jin, HAN Yaotu, ZHANG Qilong, LIU Peng. Damage Evaluation of Perforated Cement Sheath and Study on Fracture Propagation Law[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(2): 243-248. doi: 10.3969/j.issn.1001-5620.2021.02.019
Citation: ZHANG Xiaocheng, LI Jin, HAN Yaotu, ZHANG Qilong, LIU Peng. Damage Evaluation of Perforated Cement Sheath and Study on Fracture Propagation Law[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(2): 243-248. doi: 10.3969/j.issn.1001-5620.2021.02.019
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Damage Evaluation of Perforated Cement Sheath and Study on Fracture Propagation Law

doi: 10.3969/j.issn.1001-5620.2021.02.019

  • 1. State Key Laboratory of Offshore Oil Exploitation, Tianjin 300459;

  • 2. Tianjin Branch of CNOOC Ltd., Tianjin 300459

  • Received Date: 2020-12-17
    Abstract
  • In order to further improve the mechanical integrity of cement sheath in the process of perforation, fracturing and filling completion or hydraulic fracturing, and meet the requirements of completion and stimulation operation for cement sheath integrity. Aiming at the damage of cement sheath under perforating impact, perforation shooting test is carried out, and the relationship between perforation cement sheath damage and perforator and cement sheath performance under simulated temperature and pressure conditions is analyzed. Combined with the structure of perforating charge, the numerical model of cement sheath damage under perforating impact load is established. The cumulative plastic strain rate and maximum deviator stress are taken as the key indexes to form the quantitative evaluation technology of perforating cement sheath impact damage. Based on the fluid solid coupling theory and fracture propagation mechanics theory, a numerical analysis model for fracture propagation of cement sheath with non-mean characteristics is established. The damage of cement sheath and fracture propagation law during fracturing are studied according to the four states of initial crack of perforated cement sheath. The research conclusion can provide feedback guidance for perforation parameter optimization, cementing design optimization and fracturing completion operation optimization, and improve the mechanical integrity of cement sheath in reservoir perforation section, which is of great significance to ensure wellbore safety and prolong the life of oil and gas wells.

     

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