In order to improve the service performance of emulsion motor which is the most important component of drill rig, emulsion motor's structure and design method were studied.

为了提高钻机核心部件——乳化液马达——的性能，对乳化液马达的结构、设计方法进行了研究。

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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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The sales, maintenance and service of rotary drilling rig drill rod;

旋挖钻机钻杆的销售、维修、服务；

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The service companies and drill rig operators are exciting due to the probable magnitude of earnings momentum this year and next.

FORBES: Magazine Article

In the oil service sector, North American pricing remains depressed into a declining rig count.

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The bad news is much of this is already priced into the stocks of some oil-service companies, including BJ Services and Transocean (nyse: RIG - news - people ), both selling for more than 30 times this year's expected earnings.

FORBES: Magazine Article