Drilling of wells with top drive unit

Details Drilling of wells with top drive unit Drilling of wells with top drive unit

E - Fixed Constructions

21

B

255/14.7

E21B 19/06 (2006.01) E21B 3/02 (2006.01) E21B 19/02 (2006.01) E21B 19/16 (2006.01)

Patent

CA 1194855

Abstract of the Disclosure Well drilling apparatus including a top drive drill- ing assembly having a motor driven stem adapted to be attached to the upper end of a drill string and drive it during a drill- ing operation, a torque wrench carried by the top drive assemly 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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