reduce the drilling cost 降低钻井成本
Rock drill-ability is the basic parameter to optimize bits, make drilling plan and reduce drilling cost.
岩石可钻性是优选钻头，制定生产定额以及降低钻井成本的基础。
The drilling cost formula is deduced from classification drilling cost components; hence, an approach to reduce drilling cost is presented.
通过对钻探成本构成的分类，推导出钻探成本公式。
In order to reduce drilling cost and raise hole quality, it is necessary to investigate the formation, harmfulness and preventive treatment of the spiral borehole.
为了减少建井费用、提高井眼质量，研究螺旋井眼的产生、危害及其防治提上了日程。
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