Drilling rig jack mechanism

Details Drilling rig jack mechanism Drilling rig jack mechanism

E - Fixed Constructions

21

B

255/17

E21B 7/20 (2006.01) E21B 3/04 (2006.01) E21B 15/00 (2006.01) E21B 19/00 (2006.01) E21B 19/07 (2006.01)

Patent

CA 1183831

Abstract of the Disclosure A well drilling rig having jacking mechanism for lower- ing casing into a well after drilling and including piston and cylinder means which are left in the rig during drilling and a structure connectable thereto after drilling for actuation up- wardly and downwardly to lower the casing.

407904

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