石油钻采工艺2024，Vol.46Issue(1)：13-24,12.DOI:10.13639/j.odpt.202312001
深水钻井井口吸力桩稳定性计算和校核方法
Stability calculation and verification method for conductor suction piles in deepwater drilling
摘要
Abstract
In soft soil conditions of deepwater,there exist risks of sinking and tilting of surface conductors traditionally installed by jetting during the drilling process.To enhance the stability of subsea wellheads in deepwater drilling,a method of surface casing installation using conductor suction piles was proposed,and the insertion depth and stability were analyzed.Based on the pile foundation bearing theory and the generalized Winkler foundation beam model,a theoretical model for the stability of subsea suction piles at the wellhead was established.The stability characteristics and influencing factors of subsea suction piles were studied using finite element methods and finite difference methods.Based on engineering parameters of a well project in the South China Sea,theoretical calculations on the stability of the subsea suction piles were carried out,which were then compared with finite element calculations.The comparison show that the vertical ultimate bearing capacity error was 4.23%,the maximum horizontal displacement error was 6.0%and the maximum bending moment error was 2.96%,confirming the accuracy of the calculation results.Under extreme loading conditions during drilling operations,compared to traditional surface conductors,the vertical bearing capacity of subsea suction piles was increased by 43.91%,horizontal displacement was reduced by 63.21%,and the bending safety factor was 24.5 times higher.Different horizontal displacements and bending moments were applied to the subsea suction piles,showing that horizontal loads had a significant impact on lateral stability.Subsea suction piles have high vertical and lateral bearing capacities,significantly improving the stability of subsea wellheads,providing a theoretical basis for surface casing installation in soft soil conditions of deepwater.ions of deepwater.关键词
深水钻井/井口吸力桩/竖向极限承载力/横向极限承载力/稳定性校核/有限元分析Key words
deepwater drilling/conductor suction piles/vertical ultimate bearing capacity/lateral ultimate bearing capacity/stability verification/finite element analysis分类
能源科技引用本文复制引用
李舒展,杨进,朱国倞,黄熠,王宁,万宏宇,马会珍..深水钻井井口吸力桩稳定性计算和校核方法[J].石油钻采工艺,2024,46(1):13-24,12.基金项目
国家自然科学基金企业创新发展联合基金重点支持项目"深水含水合物海洋土与水下桩基耦合作用及失稳机理研究"(编号:U22B20126) （编号:U22B20126）
国家重点研发计划项目"深水生产系统泄漏检测及应急处置技术与装备"(编号:2022YFC2806100) （编号:2022YFC2806100）
国家工业和信息化部高技术船舶科研项目"水下油气生产系统全生命周期可靠性保障技术体系研究"子课题(编号:2018GXB-01-03-005) （编号:2018GXB-01-03-005）
海南省重大科技计划项目"深海高效环保膨胀型表层导管研发"(编号:ZDKJ2020021). （编号:ZDKJ2020021）
