Study on Seal Failure of Rubber Cylinder of Ultra-Deep Well Packers Based on Thermal-Mechanical Coupling

doi:10.12388/j.issn.1673-2677.2026.01.006

Abstract

Abstract: With the oil and gas exploration and development shifting toward deep and ultra-deep formations，the temperature and pressure conditions of the wellbore are becoming more and more complicated，and the problem of seal failure of packer rubber cylinders attracts increasing attention. Based on the principle of thermal-mechanical coupling，a numerical calculation model of the rubber cylinder of packers in ultra-deep wells was established according to the temperature distribution characteristics of the wellbore of ultra-deep wells，which revealed the influence of the wellbore temperature in ultra-deep wells on the sealing ability and safety of the rubber cylinder. It is shown that with the increasing wellbore temperature，the axial compressive deformation and radial expansion deformation of the cylinder both grow，and the sealing performance of the cylinder climbs up. However，the safety of the cylinder after setting is degraded. Based on the dynamic load distribution characteristics of the wellbore during perforation completion of an ultra-deep well in Sichuan Basin，the limit distance between the packer and the perforation section is calculated to be 220 m. Therefore，it is recommended that the packer be designed to be set at a position 90 m further down from 6 810 m toward the well bottom to improve the sealing performance of the rubber cylinder after setting. The research provides technical references for the optimization of packer setting positions in ultra-deep well completion.

Key words: ultra-deep well, thermal-mechanical coupling, completion packer, rubber cylinder, seal failure

摘要： 随着油气勘探开发日渐走向深层、超深层，井筒温压条件逐渐趋向复杂化，封隔器胶筒密封失效问题也受到越来越多的关注。基于热力耦合原理，结合超深井井筒温度分布特征，建立了超深井封隔器胶筒数值计算模型，揭示了超深井井筒温度对胶筒密封能力、胶筒安全性的影响规律。研究表明，随着井筒温度的升高，胶筒轴向压缩形变、径向膨胀形变均增大，胶筒密封性能提高，但是坐封后胶筒服役的安全性降低。基于四川盆地某超深井射孔完井过程中井筒动载荷分布特征，计算出封隔器与射孔段的安全极限距离为220 m，建议封隔器设计坐封位置从6 810 m向井底方向下移90 m，以提高封隔器坐封时胶筒的密封性能。研究结果为超深井完井封隔器坐封位置优化提供技术参考与借鉴。

关键词: 超深井, 热力耦合, 完井封隔器, 胶筒, 密封失效

CLC Number:

TE931

LIAN Wei, LIU Xianbo. Study on Seal Failure of Rubber Cylinder of Ultra-Deep Well Packers Based on Thermal-Mechanical Coupling[J]. Xinjiang Oil & Gas, 2026, 22(1): 49-57.

连威, 刘献博. 基于热力耦合超深井封隔器胶筒密封失效研究[J]. 新疆石油天然气, 2026, 22(1): 49-57.

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