Gravel strata is a kind of typical instable layer in drilling engineering.

卵砾石地层是钻探工程中常见的一种典型的不稳定地层。

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The measurement of engineering parameters near the bit while drilling is of significant importance for the safety and efficiency in a drilling process.

钻井过程中，近钻头处钻压、扭矩等钻井工程参数的随钻准确测量对安全、高效钻井是十分重要的。

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Large caliber cementing is a special operation in offshore drilling engineering.

大管径固井是海上钻井工程中一项特殊的作业环节。

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Banks won't lend the money until much more drilling is done, serious engineering work is completed and a feasibility study is presented sometime in 2004 that shows how much copper and gold can be mined at a profit.

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