Top drive for casing connection

摘要

A system (10) according to the present invention includes a top drive (20), a torque wrench assembly (30) used for back-up, an elevator (40) (which may also be any suitable known suspendable selective clamping apparatus or device), a pipe handler (50), and a torque head (100). The elevator (40) is suspended by bails (42) from eyes (22) of the top drive (20). The torque wrench assembly (30) is suspended by a support (32) from the top drive (20). A joint compensator (224) is positioned as desired, e.g. but not limited to between the torque head (100) and the top drive (20).