超深水环境下新概念张力系泊式水中生产平台准静态稳性特性研究(第二部分)

Investigations on the Quasi-static Stability Behavior of an Innovative Subsurface Tension Leg Platform in Ultra-Deep Water(Part Ⅱ)

本文聚焦于一种新概念张力系泊式水中生产平台(STLP),该平台可在超深水环境下应用浅水完井设备和技术开发大型油气田。重点研究STLP准静态稳性设计评估分析模型的建立,STLP的准静态稳性将确保STLP具有良好的技术性能和较高的安全性。STLP准静态稳性的实现是通过将人工海床定位于海平面以下一定位置,以使表面波浪载荷最小化。首先提出STLP准静态稳性研究的分析理论和数值模拟方法;接着,研究不同系泊方式对STLP稳定性的影响;之后,研究极端风暴条件下,系泊缆绳失效对STLP破损稳性的影响;最后进行总结和讨论。结果表明,对于3000 m以上的深海,STLP是一种可行的、具有竞争力的深海油田开发方案。

This paper focuses on an innovative technology of the Subsurface Tension Leg Platform(STLP), which utilizes the shallow-water rated well completion equipment and technology for the development of large oil and gas fields in ultra-deep waters. A design and assessment analysis model regarding the quasi-static stability of the STLP was established to provide a favorable technical performance and a high level of safety. The quasi-static stability of the STLP was achieved by positioning the artificial seabed below Mean Water Level(MWL) to minimize direct wave loading. Firstly, the analytical theory and the numerical modelling methodology for the quasi-static stability study of the STLP were presented. After that, the mooring pattern effects on the STLP stability were investigated systematically. Then, the damage stability of the STLP due to tether failures under the extreme storm conditions was studied. The results demonstrate that the STLP is a feasible and competitive offshore field development solution to petroleum production in water depths of more than 3000 m.