Provided the basis and direction for the drill string failure of the general state of the treatment.

给钻柱的一般状态下的故障的处理提供了依据和方向。

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Establish the erosive wear mechanism of drilling string in air drilling and put forward that erosion wear is a substantial cause to promote drill string failure.

初步确立了空气钻井钻柱冲蚀磨损机理，提出钻屑冲蚀是促使钻具失效的一项重要原因。

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Drill string resonance is the major cause of drill tool failure.

钻柱共振是引起深井钻具失效的主要原因。

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