深水采油树下放过程钻柱力学分析

Drill string mechanical analysis of running deepwater oil tree

根据海洋环境载荷和材料力学理论,考虑钻柱参数、海洋环境载荷、钻井船漂移量、作业水深及采油树重力等特征,建立深水采油树下放过程钻柱力学分析模型。通过对模型进行数值求解,对不同影响因素下沿钻柱的横向位移、漂移角、弯矩和剪力进行分析。结果表明:波浪载荷对钻柱上部的弯矩影响很大而对钻柱横向位移影响很小,对采油树深水下放忽略波浪力不会产生较大的误差;钻井船的漂移量对钻柱横向位移有一定的影响而对钻柱偏移角、弯矩和剪力几乎没有影响;海水阻力系数、海面海流速度及作业水深对深水采油树下放过程钻柱强度均有较大的影响。

A mechanical analytical model of drill string for running deepwater oil tree was established according to the marine environmental load and material mechanics theory. The drill string parameter, the marine environmental load, drilling ship drift, operating water depth and subsea tree weight were considered in the model. The lateral displacement, angular distortion, bending moment and shear force were analyzed. The results show that wave load has great effect on bending moment of the drill string head, but has little influence on lateral displacement, thus it can＇t produce large error without considering deepwater wave load. Drilling ship drift has certain effect on lateral displacement of the drill string, but has little influence on angular distortion, bending moment and shear force of the drill string. The resistance coefficient, current velocity and operating water depth all have great influences on the drill string strength of running deepwater oil tree.