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<p>Casing collapse is a significant problem in the exploitation of oil wells in many parts of the world, as it can inflict additional production costs. In Iran, most casing collapse incidents occur in the lower Fars formation, known as Gachsaran. Casing collapse has led to production interruptions in numerous wells and remains a potential threat to the oil and gas industry despite scientific and technological advances. For this reason, studying its causes and developing proper mitigation strategies is critical. In this paper, first, a one-dimensional mechanical earth model (1D MEM) was developed based on petrophysical data. Then, the model was validated using in-situ field data and events that occurred during drilling. In the next step, the numerical model’s geometry and boundary conditions were defined using data derived from the 1D MEM. The simulation results revealed significant creep activity in the well, which led to high strain values. The creep strains observed in the surrounding formations induce substantial stress and deformation in both the casing and the cement, ultimately leading to the collapse of the casing and tubing. Finally, the effect of the well shut-down on casing and tubing collapse was investigated. The results showed that well shut-down is somewhat effective on the collapse phenomenon and can accelerate it, but its effect is negligible compared to the salt creep rate. The obtained results were confirmed by the actual events in the field.</p>

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Impact of Salt Creep and Well Shut-Down on Casing Collapse in the Lower Fars Formation, Southern Iran

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Mohammadkazem Amiri,
  • Amir Khosravifard,
  • Masoud Riazi,
  • Mehdi Veiskarami,
  • Amoussou Coffi Adoko,
  • Donya Amerian,
  • Abdolmajid Rahimi,
  • Sajad Kazem Shiroodi,
  • Omid Saeidi,
  • Mahdi Rahbar,
  • Farshad Alavi,
  • Ebrahim Akbarzadeh Rostami

摘要

Casing collapse is a significant problem in the exploitation of oil wells in many parts of the world, as it can inflict additional production costs. In Iran, most casing collapse incidents occur in the lower Fars formation, known as Gachsaran. Casing collapse has led to production interruptions in numerous wells and remains a potential threat to the oil and gas industry despite scientific and technological advances. For this reason, studying its causes and developing proper mitigation strategies is critical. In this paper, first, a one-dimensional mechanical earth model (1D MEM) was developed based on petrophysical data. Then, the model was validated using in-situ field data and events that occurred during drilling. In the next step, the numerical model’s geometry and boundary conditions were defined using data derived from the 1D MEM. The simulation results revealed significant creep activity in the well, which led to high strain values. The creep strains observed in the surrounding formations induce substantial stress and deformation in both the casing and the cement, ultimately leading to the collapse of the casing and tubing. Finally, the effect of the well shut-down on casing and tubing collapse was investigated. The results showed that well shut-down is somewhat effective on the collapse phenomenon and can accelerate it, but its effect is negligible compared to the salt creep rate. The obtained results were confirmed by the actual events in the field.