It analysed the feasibility and the limitation of applying mining rig and water well rig to slim hole drilling in shallow gas bearing reservoirs.

分析了矿业钻机与水井钻机用于浅层天然气小眼钻井的可行性及局限性。

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It is significant to improve the hydraulic system for better performance of drilling rig and the higher ratio of finishing gas hole.

提高全液压坑道钻机液压系统的技术水平，对于改善钻机整机性能及提高瓦斯抽采孔的成孔率具有重要意义。

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On the base of that, the matching construction of the ocean workover rig for side tracking was discussed. This provided a new way for the slim hole drilling.

在此基础上，针对一种具体的钻井工艺完成了海洋修井机用于开窗侧钻作业的配套方案研究，为海洋小井眼开窗侧钻作业提供了一种新的途径。

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It required that as soon as Davy Jones was perforated and a flare came up the hole, the rig had to be backed away from the drilling platform.

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People drilling the hole with a giant rig were just able to pull it out of the way and get to safety when the steam exploded and dug a crater that's more than 100 feet deep and about as wide.

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During the three hours it took to move the rig out of the way, the debris fell back to the bottom of the hole and clogged up the perforations.

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