用于拆平台的双船协同动力定位试验研究

Experimental study on cooperative dynamic positioning for twin⁃lift decommissioning operation

大型海洋结构物的退役和拆除是油气行业面临的一个巨大挑战。双船起重拆除法提供了一种低成本、高效、灵活的解决方案,该方案采用两艘具有动力定位功能的半潜运输船从平台两侧将平台上层组块托起,随后协同托举运输至第三艘半潜运输船上后转运送至陆地。在这个过程中涉及到两艘及三艘船的协同动力定位作业,这对动力定位系统的同步性具有很高要求。多船近距离协同动力定位会受到螺旋桨与螺旋桨、船体与船体及螺旋桨与船体之间的干扰,动力定位的性能会受到影响。为此开展了相应的水池模型试验研究,对复杂环境下多船协同动力定位性能进行了分析,包括定位精度、功率消耗等,并对动力定位风险点进行了深入研究,验证了双船起重拆除法的可行性,并对实际工程的施工提供一定指导意见。

Decommissioning and dismantling of large offshore structures is a major challenge for oil and gas industry.The twin⁃lift decommissioning provides a low⁃cost,efficient and flexible solution,which adopts two semi⁃submersible transport vessels with dynamic positioning to lift the topside from both sides of the platform,and finally carry it to the third semi⁃submersible transport vessel and finally transfer it to the land.In this process,two and three ships are involved in the coordinated dynamic positioning operation,which requires high synchronicity of the dynamic positioning system.Multi⁃ship close cooperative dynamic positioning will be interfered between propellers,between hulls and between propellers and hulls,and the performance of dynamic positioning will be greatly affected.To carry out the corresponding model test research,the complicated environment for multiple cooperating ship dynamic positioning performance is analyzed,including the positioning accuracy,power consumption,etc.,and risk of dynamic positioning points are studied,so as to verify the feasibility of twin⁃lift decommissioning method and provide some guidance to the construction of practical engineering.