深水水下井口弯矩能力有限元分析

Finite Element Analysis of the Bending Moment Capacity of the Deep Water Submerged Wellhead

为确定水下井口的抗弯能力,通过对影响水下井口弯矩能力的各种因素进行有限元敏感性分析,获取各种因素对井口弯矩能力影响的规律,进而提取出各因素对弯矩能力影响的保守值,并把各保守值作为弯矩能力确定计算的输入,最后用ANSYS有限元分析软件计算出水下井口的最终弯矩能力。结果显示,在刚性锁紧预紧力作用下,水下井口的抗弯能力可达到5.89 Mft·lbf,与国际主流水下井口厂商的抗弯能力相当。

In order to determine the bending capacity of the submerged wellhead,the finite element sensitivity analysis of various factors affecting the bending moment capacity of the submerged wellhead was carried out to obtain the law of the influence of various factors on the bending moment capacity of the wellhead,and then each factor was extracted.The conservative values are taken as the input of the calculation of the bending moment capacity.Finally,the conservative bending moment capacity of the submerged wellhead is calculated by the ANSYS finite element analysis software.The results show that the bending capacity of the submerged wellhead can reach 5.89 Mft·lbf under rigid lock preload,which can be comparable to the international manufacture's wellhead bending capacity.