Investigation on Cutting Stability of Jacket in Decommissioning Process  

作　　者：李美求 段梦兰 黄一 

机构地区：[1]Department of Architecture Engineering, Dalian University of Technology [2]School of Mechanical Engineering, Yangtze University [3]Offshore Oil/Gas Research Center, China University of Petroleum

出　　处：《China Ocean Engineering》2015年第5期649-661,共13页中国海洋工程（英文版）

基　　金：financially supported by the National Basic Research Program of China(973 Program,Grant No.2011CB013702);the National Natural Science Foundation of China(Grant No.51379214);the National High Technology Research and Development Program of China(863 Program,Grant No.2008AA092701-3)

摘　　要：Jacket cutting operation is one of the most complicated and highest risk operations in the process of decommissioning offshore piled platform, the security and stability of which must be assured. In this paper, the current research on offshore structure removal and jacket cutting is introduced, on the basis of which the types of load along with the load calculation method are determined. The main influences on the stability of a jacket in cutting are analyzed. The experiment test plan is drawn by using orthogonal testing method, and the formula of critical load during the cutting procedure is deduced by differential evolution algorithm. To verify the method and results of this paper, an offshore piled platform to be decommissioned in the South China Sea is taken for an example, and the detailed schedule for jacket cutting is made with the three-dimensional finite element model of the jacket established. The natural frequency, stress, strain and stability of the jacket during cutting process are calculated, which indicates that the results of finite element analysis agree well with that of the deduced formula. The result provides the scientific reference for guaranteeing the safety of jacket in cutting operation.Jacket cutting operation is one of the most complicated and highest risk operations in the process of decommissioning offshore piled platform, the security and stability of which must be assured. In this paper, the current research on offshore structure removal and jacket cutting is introduced, on the basis of which the types of load along with the load calculation method are determined. The main influences on the stability of a jacket in cutting are analyzed. The experiment test plan is drawn by using orthogonal testing method, and the formula of critical load during the cutting procedure is deduced by differential evolution algorithm. To verify the method and results of this paper, an offshore piled platform to be decommissioned in the South China Sea is taken for an example, and the detailed schedule for jacket cutting is made with the three-dimensional finite element model of the jacket established. The natural frequency, stress, strain and stability of the jacket during cutting process are calculated, which indicates that the results of finite element analysis agree well with that of the deduced formula. The result provides the scientific reference for guaranteeing the safety of jacket in cutting operation.

关 键 词：stability jacket cutting operation piled platforms decommissioning 

分 类 号：P752[天文地球—海洋科学]