Its extracting method includes surface well drilling and underground mine tunnelling. The tunnelling method is suitable for many mine areas in our country.

开发煤层气的方法有地面钻井开采和井巷开采两种，其中井巷开采方法适用于我国许多矿区。

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Taking use of the shock absorber, it can raise the service life for drill bit and drill tool, speed up drilling, get rid of drilling jumping, well protect surface equipments and drilling tools.

所以在钻井作业中采用减震器，对于延长钻头使用寿命，加快钻进速度、克服严重跳钻、保证正常钻井、保护地面设备及钻具是十分可靠的。

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This paper presents the design of surface casing drilling in Shengli Oilfield, as well as development of main tools and the field application in Well Kendong-341.

详细介绍了胜利油田表层套管钻井技术整体方案设计、主要工具的研制及在垦东341井的现场试验情况。

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The effort, called a "top kill, " involved plugging the ruptured deep-sea well by pumping heavy drilling fluid into it from the surface, nearly a mile above.

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