“南海挑战号”半潜式平台移井优化方法研究

Well-relocating optimization method for the Nanhai Tiaozhan semisubmersible platform

为了解决半潜式平台移井方案计算困难的问题,本文以“南海挑战号”半潜式平台为依托,开展移井优化方法研究。依据多段悬链线控制方程,考虑平台和各井口的位置关系,建立了系泊链长度与顶张力的关系集。采用非支配排序遗传算法,给出了最佳移井路线方案。选取了4组现场移井方案进行对比分析,研究结果表明:所提出的计算方案有效地节约移井所需的时间成本和人力成本。以D_(3)-D_(2)移井操作为例,与现场采用方案相比,移井前后系泊链收放总量减少了40.17%,同时平台移井过程中的平稳程度降低了76.45%,大幅度的提高了移井作业平台的效率和安全性。

A well-relocating optimization method for the Nanhai Tiaozhan semisubmersible platform is proposed to solve the difficulty of the well relocation calculation of semisubmersible platforms.The relationship sets between the mooring chain length and top tension were established by using the governing equations of a multicomponent mooring system.A nondominated sorting genetic algorithm was used to obtain the optimized relocating route.Four sets of relocation operations were selected in this study.Results showed that the proposed well-relocating scheme could effectively save on operating time and labor costs.The relocation scheme D_(3)-D_(2) was taken as an example and compared with the original well-relocating scheme.Compared with that of the D_(3)-D_(2) scheme,the total retraction and release length of the mooring chains of the present optimized scheme had reduced by 40.17%.Meanwhile,platform stability had reduced by 76.45%.The efficiency and safety of the platform during well relocation had significantly improved.