用螺杆钻具组合实施煤矿工程孔定向钻进时，钻头侧向力是其主要力学特性。

The operation performance of PDC bits with screw drill tool appplied now in oilfield were analyzed comprehensively.

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该系统主要用于陆上、海洋平台等方面的定向钻进，可以精确地了解钻头的航向，还可以测量钻头处的温度和磁场强度。

It is used to control the drilling direction of the land or offshore platforms. It can provide accurate drilling direction and measure the temperature and magnetic intensity around the drill.

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