Drilling of wells with top drive unit

Boring or penetrating the earth – With orienting or racking means for unconnected tools or...

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Details

166 775, 175 52, E21B 1906

Patent

active

044495960

ABSTRACT:
Well drilling apparatus including a top drive drilling assembly having a motor driven stem adapted to be attached to the upper end of a drill string and drive it during a drilling operation, a torque wrench carried by the top drive assembly and movable upwardly and downwardly therewith and operable to break a threaded connection between the drill string and the stem, and an elevator carried by and suspended from the top drive assembly and adapted to engage a section of drill pipe beneath the torque wrench in suspending relation. The torque wrench and elevator are preferably retained against rotation with the rotary element which drives the drill string, but may be movable vertically relative to that rotary element and relative to one another in a manner actuating the apparatus between various different operating conditions.

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"Descriptive Data-Bowen ES-7 Electric Drilling Swivel and Accessories Equipment", Bowen Tools, Inc., Published: Jul., 1979.

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