基于隔水管受力分析的深水钻井平台防台风措施优选

针对深水平台作业中遭遇台风平台需要优选紧急避航路线的问题,利用有限元分析方法建立了隔水管拖航过程的力学模型,简化波浪和海流作用,得到了软、硬悬挂隔水管长度与许用最大速度关系,制定了深水钻井平台3种防台措施,并给出平台与台风最不利位置计算模型,以某浮式钻井平台紧急防台为例优选防台措施。力学分析表明:隔水管的最大应力和最大弯矩位置出现在近海面处;浮块数量增加,隔水管顶部最大转角会限制平台的最大航速;隔水管较短的情况硬悬挂方式有更快的航速,反之,软悬挂方式最大许用航速大。防台措施表明:根据最不利位置计算模型,可以快速计算出符合的防台位置和防台措施,根据安全和再作业等情况优选出最佳航行路线。

Preferred anti-typhoon measures for deepwater drilling platform based on riser force analysis

To address the problem that deepwater platform operations have to preferably choose navigation avoidance routes in the case of typhoon, the finite element method is used to build a mechanical model about the towing process of riser in which the roles of waves and currents are simplified. The relation between the lengths of soft and hard suspension risers and the allowable maximum velocity is worked out and three anti-typhoon measures for deepwater drilling platform are developed. The model to calculate the most unfavorable positions of platform in the case of typhoon is provided and the preferred anti-typhoon measures are identified with a floating drilling platform as an example. The mechanical analysis shows that: the positions of riser under the maximum stress and the maximum bending moment appear offshore; when the number of floating blocks is increased, the maximum angle at the top of the riser will limit the maximum navigational speed of the platform; when the riser is short, hard suspension will enable faster speed; otherwise, soft suspension will enable the maximum allowable speed. The anti-typhoon measures suggest that: the computational model based on the most unfavorable positions can quickly calculate the appropriate anti-typhoon position and measures and the preferred navigation route can be selected according to the safety and re-operation.