套管钻井中套管柱动应力研究及计算方法

在套管钻井过程中,套管柱在旋转情况下同时受到轴向荷载及旋转带来的扭矩荷载的作用,其受力状况与套管柱在非旋转情况下的受力状况有较大的差异。在分析套管钻井过程中套管柱实际受力状况的基础上,应用双向应力状态分析方法和能量守恒原理,分析和研究了套管柱在静态轴向力和剪切力作用下的许用扭矩,并针对套管钻井过程中套管柱旋转的工况,提出了套管柱在旋转状态下的许用扭矩及安全转速的计算方法,为合理地选择套管钻井作业参数提供了依据和方法。

Study and calculation of dynamic stress on casing string during casing drilling

During casing drilling,the casing string is subjected simultaneously to both the axial force and rotary torque under rotation,which causes the stress status of the casing string different from that under non-rotation.Based on the analysis of actual stress status of casing string during casing drilling,the bidirectional stress status analysis method and energy conservation principle are used to analyze and study the permissible torque of casing string under the axial force and shear force and put forward the method to calculate permissible torque and safety rotary speed of casing string under the rotation conditions,which offers the basis and method for selecting parameters for casing drilling operation.