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<p>In ultra-deep salt mudstone drilling, the issue of casing damage caused by strong formation creep, high temperature and pressure, and corrosive media is a key engineering challenge that constrains the safe and efficient development of deep oil and gas resources. To address this, this paper takes the casing damage incidents at Wells X-1 and X-2 in the Tarim Basin as case studies, comprehensively considering the impact of geological factors, engineering factors, construction factors, and material factors on casing damage. A comprehensive evaluation method for casing damage throughout the entire lifecycle based on multiple factors and a finite element model for bent casings have been established. Numerical simulation and experimental methods were combined to validate and analyze these models, conducting assessments and research on casing damage incidents. Through numerical simulation and experimental verification, it was found that when the dogleg increased from 20°/30 to 100°/30&#xa0;m, the resistance to squeeze strength of the 8-1/8” decreased from 145 to 91&#xa0;MPa. The study also revealed a negative correlation between the casing diameter-to-thickness ratio and resistance to squeeze strength. The numerical simulation errors were controlled at around 5% (bending) and 10% (squeezing), validating the scientific nature of the casing damage assessment method established in this paper. This not only reduces the probability of casing damage but also provides reliable theoretical guidance for engineering practice.</p>

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Assessment and Confirmatory Analysis of Casing Damage in Ultra-Deep Well Salt Paste Layer

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Shaobo Feng,
  • Junfeng Xie,
  • Bo Zhou,
  • Maoxian Xiong,
  • Zhengqing Ai,
  • Sutao Ye,
  • Yuqi Ding

摘要

In ultra-deep salt mudstone drilling, the issue of casing damage caused by strong formation creep, high temperature and pressure, and corrosive media is a key engineering challenge that constrains the safe and efficient development of deep oil and gas resources. To address this, this paper takes the casing damage incidents at Wells X-1 and X-2 in the Tarim Basin as case studies, comprehensively considering the impact of geological factors, engineering factors, construction factors, and material factors on casing damage. A comprehensive evaluation method for casing damage throughout the entire lifecycle based on multiple factors and a finite element model for bent casings have been established. Numerical simulation and experimental methods were combined to validate and analyze these models, conducting assessments and research on casing damage incidents. Through numerical simulation and experimental verification, it was found that when the dogleg increased from 20°/30 to 100°/30 m, the resistance to squeeze strength of the 8-1/8” decreased from 145 to 91 MPa. The study also revealed a negative correlation between the casing diameter-to-thickness ratio and resistance to squeeze strength. The numerical simulation errors were controlled at around 5% (bending) and 10% (squeezing), validating the scientific nature of the casing damage assessment method established in this paper. This not only reduces the probability of casing damage but also provides reliable theoretical guidance for engineering practice.