It is very important for improving drilling rate, reducing drilling cost and safety drilling to carry out drill stem failure analysis and prevention.

开展油田钻柱失效分析与预防对提高钻井速度、降低钻井成本及井下安全钻进具有重要意义。

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There are series problems exist in the existing thick seam mining technology with large dip Angle, thus cause low extraction rate, poor safety and high cost.

现有的大倾角厚煤层开采技术存在着一系列问题，从而导致煤矿回采率低，安全性差，成本高。

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The utility model has the advantages of simple structure, reliable working safety, low cost, convenient maintenance, and high punching rate.

本实用新型结构简单，工作安全可靠，成本低，维修方便，穿孔率高。

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