| 摘要 |
A mobile rig for angle drilling comprises a tiltable drilling mast and a drill pipe storage rack both mounted on a land vehicle, with a carriage movable lengthwise on a track extending alongside the mast. When the mast is in an oblique position for angle drilling, an articulating arm on the carriage retrieves drill pipes individually from the pipe storage rack, swings them to a position above the mast and lowers them into alignment with a drilling head. The storage rack is moved longitudinally as the drill pipe supply is depleted so that the arm can grasp each drill pipes close to its center of gravity. In an alternative embodiment, one of the elements of the articulating arm is extensible.
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