However, the study in the hydraulic top drive only used in the service machine, poor-boy rig, also there have no research on deep and ultra-deep series of hydraulic top drive unit in China.

然而，对液压顶驱的研究，还停留在修井机、和浅井钻机上。国内目前还没有深井和超深井系列的液压顶驱装置。

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By using Shengli No 3 offshore platform as an example, the importance and procedure of maintenance of the hydraulic systems of the top drive drilling rig are introduced.

以胜利三号平台为例介绍了顶驱钻机的维护系统及其重要性。

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