钻井钻

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1.

All of those were expected to provide reference for further studying of erosion abrasion in gas drilling .

这将为更深入地研究气体钻井钻柱冲蚀磨损工作提供了依据和参考。

lib.swpu.edu.cn

2.

Therefore , it's necessary to study the erosive wear mechanism of drilling string in air drilling .

为此，有必要对空气钻井钻柱的冲蚀磨损机理进行研究。

lib.swpu.edu.cn

3.

Method for evaluating fatigue damage of drill string in side tracked holes

侧钻井钻柱疲劳损伤评价方法的研究

4.

Reaming Technique of Side - Tracked Well

侧钻井钻后扩眼技术