Abandonment and Recovery Operation of Steel Lazy-Wave Riser in Deepwater by Controlled Vessel and Cable Velocity Rate  

作　　者：GU Ji-jun HUANG Jun GAO Lei CHEN Lei-lei JIA Ji-chuan WANG Shu-jiang 

机构地区：[1]College of Mechanical and Transportation Engineering,China University of Petroleum-Beijing,Beijing 102249,China [2]CNOOC Research Institute,Beijing 100028,China

出　　处：《China Ocean Engineering》2023年第1期29-41,共13页中国海洋工程（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Grant No.52271299);the Science Foundation of China University of Petroleum,Beijing (Grant No.2462020YXZZ046)。

摘　　要：Evaluation of abandonment and recovery operation of steel lazy-wave riser in deepwater is presented in this paper.The calculation procedure includes two single continuous SLWR and cable segments, which are coupled together to form the overall mathematical model. Then the equilibrium equations of SLWR and cable are established based on minimum total potential energy principle. The coupled equations are discretized by the finite difference method and solved by Newton-Raphson technique in an iterative manner. The present method is validated by well-established commercial code OrcaFlex. Recovery methods by considering different ratios of vessel’s moving velocity to cable’s recovery velocity are evaluated to optimize the abandonment and recovery operation. In order to keep the tension more stable during the recovery process, the rate ratio before leaving the seabed is increased, and the rate ratio after leaving the seabed is reduced.

关 键 词：steel lazy-wave riser ABANDONMENT RECOVERY 

分 类 号：X703[环境科学与工程—环境工程]