tubing string

Presently, the study did for it just directly used the results of study buckling behaviors on drilling pipe, casing string, conventional oil tubing to deal with coiled tubing;

目前对它的研究只是将钻柱、套管柱和常规油管柱屈曲问题的研究结果直接用于连续油管，现场很多实例表明，这样做的偏差很大，连续油管因为残余应变而具有独特的井下屈曲行为。

A specially profiled probe, known as a stinger, is attached to the bottom of the tubing string to engage in the retainer during operation.

一个定型的探管，即注水泥插入管，被固定在油管柱的底部，以便在作业期间与水泥限位器接合。

It can be extensively applied to tubing string for oil production technology.

可广泛应用于油水井增产增注工艺管柱上.

Problems of centering rod string and tubing string in straight holes The influences of running conditions of the oil wells on the wear of rod string and tubing were systematically analyzed.

直井中抽油杆柱和油管柱的扶正问题系统分析了油井生产条件与生产参数对杆管偏磨的临界轴向压力与柱塞下行阻力的影响。

In consideration of the effect of liquid dynamic pressure on the tubing string vertical vibration, the differential equation and frequency equation for describing the vibration are set up.

考虑液动压力对油管柱纵向振动的影响，建立了油管柱纵向振动微分方程，并给出了这种情况下油管柱纵向振动的频率方程。

Comparison of three kinds of tools for controlling the stretching and shrinking of the tubing string shows that the hydraulic tubing anchor is the best with convenient operation and low price, therefore it should be popularized.

比较3种控制油管伸缩工具，以液压式油管钱控制油管柱伸缩效果最好，操作方便，价格低廉，应大力推广应用。