Evaluation of the service life of a rotary drilling line is of great importance to ensuring safe drilling and reducing drilling cost.

钢丝绳使用寿命评定对确保钻井安全与降低钻井成本具有十分重要的意义。

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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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Required by geology or reducing drilling cost by using wells drilled, 3D sidetracking wells are getting more and more, 3D sidetracking wells are increasingly important in oilfield development.

地质要求或利用已钻井眼降低钻井成本，使三维侧钻井不断增多，三维大斜度侧钻井在油田开发中越来越重要。

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