深水钻井隔水管与井口系统耦合力学行为分析

隔水管与井口系统的稳定性对海洋石油安全高效地生产与开发起着决定性的作用。为研究实际工况下的隔水管和井口系统的力学行为,综合考虑浪流载荷和土壤抗力等因素,建立了隔水管与井口系统耦合力学理论模型;并分析了张紧力和平台偏移量对隔水管和地层组合管柱力学行为的影响。分析结果表明,平台偏移量对隔水管与地层组合管柱的横向位移和弯矩影响不大,增加张紧力可以减小隔水管的横向位移和截面弯矩;同时也能减小地层组合管柱的横向位移,对增强井口系统的稳定性有促进作用。

Mechanical behavior analysis of drilling riser-wellhead coupled system in deepwater

The stability of riser and wellhead system plays a crucial role in the safe and highly efficient production of offshore oil and gas, in order to study the mechanical behavior of riser and wellhead system under actual working conditions,in this paper, a theoretical coupled mechanical model of riser and wellhead system is established by considering the factors such as wave load and soil resistance, and analyzed the influence of the tension and the displacement of the platform on the mechanical behavior of the riser and the combined pipe in formation.The analysis results show that the offset of platform has a little effect on the lateral displacement and bending moment of the riser and the combination pipe,increasing thetension can reduce the lateral displacement and bending moment of riser, and it also can reduce the lateral displacement and bending moment of combined pipe which can enhance the stability of the wellhead system.