By means of the survey at Anpeng and Zhaowa Blocks, the main modes and the causes of drilling tool failure in earlier period are found out.
通过对安棚、赵凹区块钻具早期先期失效现状调查，得出了钻具早期失效的主要模式及产生原因。
However, with the well number increasing, the drilling tool failure is outstanding gradually, which has safe effect and extends the application of air drilling.
随着气体钻井数量的增加，钻具失效问题日益突出，已影响到气体钻井的安全和推广应用。
Research on vibration problems which is the main reason causing bottom drilling tool failure, can reduce drilling tool damage and emergence of underground accidents.
振动问题一直是引起底部钻具失效的主要原因，对其进行研究能减小钻具损害和各类井下事故的发生。
The fatigue failure of drilling collar thread linking is a main factor of the drill collar failure, which accounts for a large proportion of the accidents in the drilling tool failure.
钻铤螺纹联结失效是钻铤失效的主要因素，在整个钻具失效事故中占很大比例。
The effect of tool joint must be considered in analysis of drillstring strength to reduce drillstring failure and keep safety in drilling process.
在计算钻柱强度时，应考虑接头对钻杆弯曲应力的影响，以实现安全钻井。
The effect of tool joint must be considered in analysis of drillstring strength to reduce drillstring failure and keep safety in drilling process.
在计算钻柱强度时，应考虑接头对钻杆弯曲应力的影响，以实现安全钻井。
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