Tool driving or impacting – With means to adjust position of axis of tool advance – Adjustment powered by motor or mechanism
Patent
1981-01-23
1983-12-20
Smith, James G.
Tool driving or impacting
With means to adjust position of axis of tool advance
Adjustment powered by motor or mechanism
175 85, E21B 1500, E21B 1900
Patent
active
044211791
ABSTRACT:
Well drilling apparatus including a powered drilling unit connectable to the upper end of a drill string and adapted to rotate it to drill a well, and a vertically extending guide track structure which guides the drilling unit for movement along the axis of the well, with a portion of the guide track structure being mounted for swinging movement between a drilling position in which the drilling unit is aligned with the axis of the well and a slightly inclined position in which the track structure guides the drilling unit for movement along an inclined axis in alignment with a mousehole, and with the drilling unit also preferably being mounted for movement to a laterally retracted position at a side of the well in which it leaves an area along the axis of the well unobstructed for use of conventional hoisting equipment in making a `round trip` of the drill string out of and then back into the well.
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Adolphson K. Bradford
Green William P.
Smith James G.
Varco International, Inc.
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