Patent ID: 8342250
Filing Date: 2013-01-01
Classification: E21B

Abstract:
1. A casing drive assembly, comprising: a housing further comprising a longitudinal passage therethrough in communication with a plurality of circumferentially spaced, radially movable pistons and extending to at least one outlet of the lower end of the assembly; said pistons comprising a gripping member having a gripping face selectively engageable with a casing joint in response to pressure in said longitudinal passage applied to a drill bit located at a distal end of a lowermost casing joint for casing drilling therewith; a drive for selectively moving said housing and one or more casing joints that are engaged to or supported by said radially movable pistons; a plurality of selectively mechanically actuable, radially movable slips for selective engagement of said casing joint for positioning the joint adjacent another joint for assembly; a plurality of radially spring-biased friction blocks longitudinally spaced from the slips; a downward-facing packer cup positioned between the slips and the at least one outlet; and a stabilizer guide below the downward-facing packer cup.