Boring or penetrating the earth – With means to simultaneously feed and rotate tool from a...
Patent
1985-10-17
1986-05-20
Novosad, Stephen J.
Boring or penetrating the earth
With means to simultaneously feed and rotate tool from a...
173 44, 81 5731, 81 5735, 175 85, E21B 1906
Patent
active
045895031
ABSTRACT:
A top drive well drilling apparatus, having a drive unit for rotating a drill string. The drive unit is connected to a carriage, which guides the drive unit along a vertical guide track. A wrench assembly, for making and breaking connections between the stem of the drive unit and the drill string, can be moved between a working position along the stem and a retracted position away from the stem. The wrench assembly can also be moved vertically, and is mounted on the carriage.
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"Varco Top Drive Drilling System, Description and Specifications," Varco Oil Tools, Feb. 1983.
Johnson Horace A.
Smith, Jr. Roger
Hughes Tool Company
Kelly H. Dennis
Neuder William P.
Novosad Stephen J.
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