特殊结构钻杆的研发与应用

Development and application of special structure drill pipe

为解决常规钻杆采用双吊卡起下钻劳动强度大、气动卡瓦起下钻时卡瓦牙易咬伤钻杆本体,严重缩短钻杆寿命等问题,在常规钻杆基础上进行了优化设计。主要在钻杆母接头扣吊卡处的下方设计一个凸台,改变坐气动卡瓦时钻杆本体受力方向。通过仿真模拟计算建模、边界条件设定及凸台所受应力分析等,掌握了凸台长度、外径与所受应力关系,优化设计出特殊结构钻杆。通过气动卡瓦无牙板动力卡盘设计,消除了卡瓦牙对钻杆本体的伤害,可有效延长钻杆使用寿命。现场应用表明,使用特殊结构钻杆,配合新型气动卡瓦,在同等工况下,起下钻作业时间节约10%以上,钻杆寿命提高50%以上。

In order to solve the problems that the labor intensity is high when using double elevators to trip conventional drill pipe,and the slip teeth are easy to bite the drill pipe body when using the pneumatic slip to trip the drill pipe,and the life of the drill pipe is seriously shortened,etc.,the optimization is based on the conventional drill pipe design.A boss is mainly designed under the buckle of the drill pipe female joint to change the stress direction of the drill pipe body when the pneumatic slip of the seat is changed.Through simulation modeling,the boundary condition setting,and stress analysis of the boss,the relationship between the length and outer diameter of the boss and the stress was mastered,and the special structure drill pipe was optimized and designed.Through the design of the power chuck toothless plate of the pneumatic slip,the damage of the slip teeth to the drill pipe body is eliminated,and the service life of the drill pipe can be effectively prolonged.The field applications show that under the same working condition,using special structure drill pipe,and combined with the new type pneumatic slip,the tripping operation time can be save by more than 10%and the life of drill pipe can be increased by more than 50%.