Well casing jack mechanism

Details Well casing jack mechanism Well casing jack mechanism

E - Fixed Constructions

21

B

255/14.3

E21B 7/20 (2006.01) E21B 19/07 (2006.01)

Patent

CA 1164441

WELL CASING JACK MECHANISM Abstract of the Disclosure A casing jacking mechanism is positionable in the rotary table opening of a well drilling rig to lower casing into the well, and is preferably formed sectionally of a number of components adapted to be assembled temporarily on the rig and subsequently dismantled after the casing has been lowered. The jacking mechanism may include a first support structure to be located above the upper end of the well, two piston and cylinder mechanisms adapted to be lowered at different sides of the axis of the well to positions in which their cylinders are connected by the support structure, a second support structure connectable to and actuable vertically by the pistons of the piston and cylinder mechanisms, a spider unit adapted to be placed on the first support structure and releasably engageable with the well pipe, and an elevator to be positioned on the second support structure for movement vertically therewith and also releasably engageable with the well pipe.

377909

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