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<p>In-situ pressure-preserving coring (IPP-Coring) technology is one of the most effective methods for evaluating formation resources. As drilling depths increase, pressure-coring devices must withstand higher pressures. The ultimate pressure-bearing (UPB) capacity of the pressure preservation closure (PPC) determines the upper limit of oil and gas resource exploration, whereas the UPB capacity of existing pressure-coring devices typically does not exceed 80&#xa0;MPa. In this paper, an ultimate pressure-bearing test of a PPC was conducted, a numerical calculation model for its pressure-bearing capacity was established, and an optimized design suitable for a 140-MPa pressure rating was proposed. The results show that the failure mode of the original PPC at 100&#xa0;MPa was the fracture of the ball valve housing arm, caused by extremely high loads in the pivot region. The failure pressure and the critical areas of structural stress concentration obtained through numerical calculation were highly consistent with the experimental results, validating the accuracy of the numerical model. An optimized design was implemented targeting the structurally weak areas of the original PPC. The average stress of the optimized PPC structure under a 140-MPa internal pressure condition was only 253.4&#xa0;MPa, and its ultimate pressure-bearing capacity meets the 140&#xa0;MPa operational requirements. This research enables pressure-coring devices to meet deeper exploration tasks, providing theoretical support for deep oil and gas resource exploration and evaluation.</p>

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Mechanical Analysis and Structural Optimization of the Pressure-Preserving Controller for Deep-Well Oil and Gas Pressure-Coring Device

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Yang Su,
  • Zekun Yin,
  • Tieming Zhang,
  • Chao Zhou,
  • Chuanjun Han

摘要

In-situ pressure-preserving coring (IPP-Coring) technology is one of the most effective methods for evaluating formation resources. As drilling depths increase, pressure-coring devices must withstand higher pressures. The ultimate pressure-bearing (UPB) capacity of the pressure preservation closure (PPC) determines the upper limit of oil and gas resource exploration, whereas the UPB capacity of existing pressure-coring devices typically does not exceed 80 MPa. In this paper, an ultimate pressure-bearing test of a PPC was conducted, a numerical calculation model for its pressure-bearing capacity was established, and an optimized design suitable for a 140-MPa pressure rating was proposed. The results show that the failure mode of the original PPC at 100 MPa was the fracture of the ball valve housing arm, caused by extremely high loads in the pivot region. The failure pressure and the critical areas of structural stress concentration obtained through numerical calculation were highly consistent with the experimental results, validating the accuracy of the numerical model. An optimized design was implemented targeting the structurally weak areas of the original PPC. The average stress of the optimized PPC structure under a 140-MPa internal pressure condition was only 253.4 MPa, and its ultimate pressure-bearing capacity meets the 140 MPa operational requirements. This research enables pressure-coring devices to meet deeper exploration tasks, providing theoretical support for deep oil and gas resource exploration and evaluation.