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<p>Existing “seepage-stress-damage” models are mainly used for pre-drilling prediction and post-drilling evaluation of collapse pressure. Such models involve a large number of parameters that are difficult to obtain. In this paper, the “seepage-stress-damage” model is simplified into a strength softening model applicable to real-time collapse analysis while drilling. A method is also proposed to determine the parameters of the strength softening model using logging data. Field engineers of Well X adjusted drilling fluid properties based on the strength softening model. Within 10&#xa0;days of exposure, only small collapse blocks (0.2&#xa0;cm × 0.23&#xa0;cm) were retrieved, and the 1000&#xa0;m thick clay formation in Well X was drilled efficiently.</p>

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A method for collapse pressure analysis while drilling through fractured clay formations

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月25日

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  • Chen Zhuo,
  • Cui Guojie,
  • Su Jian,
  • Zhu Guowei,
  • Xie Rongbin

摘要

Existing “seepage-stress-damage” models are mainly used for pre-drilling prediction and post-drilling evaluation of collapse pressure. Such models involve a large number of parameters that are difficult to obtain. In this paper, the “seepage-stress-damage” model is simplified into a strength softening model applicable to real-time collapse analysis while drilling. A method is also proposed to determine the parameters of the strength softening model using logging data. Field engineers of Well X adjusted drilling fluid properties based on the strength softening model. Within 10 days of exposure, only small collapse blocks (0.2 cm × 0.23 cm) were retrieved, and the 1000 m thick clay formation in Well X was drilled efficiently.