drive-in rig
常见例句
- It is necessary to develop thealtemating-current variable-frequency electric drive drilling rig which is regarded as the most advanced rig in the world.
应摆脱国产石油钻机现有的传动模式，研制当今世界上最先进的交流变频电驱动钻机。 - 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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