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Nor Andino天然气管道在穿越山脉时选择使用了水平定向钻技术。因穿越的是地震活跃地区,岩石和土壤条件不稳定,首先选择了63/4in的泥浆电机和97/8in的牙轮钻头完成导向孔钻进;然后使用扩孔器分三个阶段扩孔,分别为22、26、30in。管线经静水试压和测径后在16h内就完成了回拖安装。
The Nor Andino gas pipeline was chosen to use horizontal directional drilling technology when crossing the mountains. Because of the earthquake-stricken area and unstable rock and soil conditions, the 63 / 4in mud motor and 97 / 8in roller cone bit were selected to complete the pilot hole drilling. Then the reamer was used to expand the hole in three stages, Respectively 22,26,30in. Pipeline hydrostatic pressure test and measuring the diameter within 16h to complete the back-drag installation.