E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/17
E21B 7/02 (2006.01) E21B 3/02 (2006.01) E21B 7/04 (2006.01) E21B 15/00 (2006.01) E21B 19/02 (2006.01) E21B 19/14 (2006.01)
Patent
CA 1179322
TOP DRIVE WELL DRILLING APPARATUS Abstract of the Disclosure 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 drill- ing 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.
388015
Fetherstonhaugh & Co.
Varco International Inc.
LandOfFree
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