E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 3/02 (2006.01) E21B 4/00 (2006.01) E21B 15/00 (2006.01) E21B 19/16 (2006.01)
Patent
CA 2390365
A top drive well drilling apparatus includes a body with means for suspending the body from a drilling rig. A motor is secured to the body. The motor has a central passage defining a rotational axis. The central passage is adapted to receive a tubular drive shaft. A pipe gripping assembly is provided which underlies and is in axial alignment with the central passage. The pipe gripping assembly rotates independent of the motor for purposes of orientation.
Dobrijevic Sinisa
Nielsen Shawn James
Dobrijevic Sinisa
Fluid Technical Services Inc.
Nielsen Shawn James
Woodruff Nathan V.
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