Well pipe jack

Details Well pipe jack Well pipe jack

E - Fixed Constructions

21

B

255/14.4

E21B 7/20 (2006.01) E21B 19/00 (2006.01) E21B 19/07 (2006.01)

Patent

CA 1185228

Abstract of the Disclosure A jack for lowering casing from a drilling rig into a well, including a plurality of piston and cylinder mechanisms extending vertically at different sides of the well axis and supported at their lower ends from a base, a first upper structure extending between upper ends of the cylinders of those mechanisms and supported from the base through the cylinders, a second upper structure supported by and movable with the pistons, and gripping units carried by the two structures and releasably engageable with the casing to lower it in steps by relative vertical actuation of the two structures by the piston and cylinder mechanisms.

403140

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