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1·Pick up drill stem test tool.

提起钻柱测试工具。

2·DST (drill Stem test), a fast test for show of oil and gas while drilling.

即中途测试，是指油井在钻井过程中，对有。

3·The longer the single drill pipe, the lesser the critical compressive force of drill stem.

钻杆的单根长度越长，钻柱所能承受的临界载荷越小。

4·Drill stem tests are taken from some Wells almost immediately after drilling and completion operations.

有些井刚钻完并进行完井作业后，就立即采取钻杆测试。

5·Therefore the nonlinear lateral free vibration of drill stem is investigated by the perturbation method.

分析公式表明， 钻柱横向线性振动仅是钻柱横向非线性振动的一种特殊情况；

6·The influence of the initial deflection on the nonlinear lateral free vibration of drill stem is discussed.

讨论了初弯曲对钻柱横向非线性振动的影响。

7·On the basis of energy method, the possibility of drill stem buckling in inclined straight hole is studied.

本文应用虚位移原理，在充分考虑钻柱所处的特殊环境的基础上，考察了斜直井眼中钻柱屈曲的可能性。

8·The rotary drill stem will engender direction drift in rotary drilling of directional well and cluster well.

在定向井及丛式井的转盘钻进中，旋转钻柱会产生方位漂移。

9·A new method for calculating drill stem strength can be applied to designing and checking strength of drill stem.

提出了一种钻柱强度计算新方法，可用于钻柱的强度设计和强度校核。

10·In this paper, the problem about stability of the drill stem in the borehole with iso-curvature is studied by use of energy method.

文中利用能量法，研究了等曲率井眼中钻柱的稳定性问题。