Top drive well drilling apparatus with improved wrench assembly

Details Top drive well drilling apparatus with improved wrench assembly Top drive well drilling apparatus with improved wrench assembly

E - Fixed Constructions

21

B

255/23

E21B 3/00 (2006.01) E21B 3/02 (2006.01) E21B 19/02 (2006.01) E21B 19/16 (2006.01)

Patent

CA 1227189

ABSTRACT OF THE DISCLOSURE 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.

470375

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