挠性钻杆是实现高精度定向钻孔技术的关键器具之一。
The flexible drill string is one of the key tools to materialize the high accuracy directional drilling technique.
在测点数据有限的情况下，探讨定向钻孔轨迹的模拟方法，并通过实例分析模拟方法的可靠性。
Simulation method of directional drilling course was discussed under limited survey point data, and the reliability of simulation method was analyzed with cases.
水平定向钻孔(HDD)常常是管道穿越河流或湿地这类障碍优先选用的方法。插图表示河流穿越的典型情况。
HDD is often the preferred method for constructing the pipeline across such obstacles as streams or wetlands. (See inset diagram.) Here is shown a typical river crossing.
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