导管架与基盘导向桩的对接数值模拟分析技术

导管架与基盘导向桩的对接技术,产生于海上油田开发的需要。为了满足油田投资者“缩短海上油田开发工程的周期,尽快收回投资”的要求,工程开发者开发了在预安装海底基盘上进行预钻井的方案。由于钻井作业和平台设施的工程设计与建造同时进行,此方案大大缩短了投产前的开发周期,在某些情况下,还降低了整体开发工程成本。对接技术的发展主要缘于80年代北海油田的实践经验。在80年代末,用导向桩进行对接的技术得到了普遍的认同。这种技术的对接过程是在导管架坐底之前,用导管架上预先设置的套筒与基盘上的导向桩进行套接的过程。在这一过程中,精确估算导向桩与套筒之间的对接力是非常重要的,因为该对接力一方面要用于局部对接结构的设计,一方面要用来评估对安装海况的限制。本文对对接方式方法、对接力的分析方法和实施对接过程的安装海况进行了描述,并以文昌导管架为例,进行了分析和说明,最后提出了相关的结论和建议。

Docking Analysis of Jacket to Template Docking Pile

With a trend towards faster realization of capital investments for offshore oil developments, the use of pre-drilled wells on a pre-installed template is becoming increasingly attractive in China offshore. This method enables an earlier production of the field and, in certain cases, lower overall development costs. The method of pin/sleeve indexing arrangement has become more common in recent years especially with WZ 12-1 jacket,Pinghu jacket and Wenchang jacket. This approach usually involves mating of two or more docking sleeves on locating piles adjacent to the template, prior to grounding of the jacket. The accurate prediction of the forces between the piles and sleeves becomes of paramount importance not only in detail structural design, but also in the overall assessment of the limiting sea states for installation. The paper describes the analytical methods that have been developed for the prediction of the docking forces on jackets during installation.