Wells – Processes – Placing or shifting well part
Patent
1981-08-28
1983-12-20
Purser, Ernest R.
Wells
Processes
Placing or shifting well part
175171, 166 77, 166102, 173149, 254 29R, E21B 1910
Patent
active
044211759
ABSTRACT:
A well drilling rig having a rotary table for driving a drill string rotatively and having jacking mechanism for lowering casing into the well after drilling, with the jacking mechanism including fluid pressure actuated piston and cylinder means which may be left in the rig during drilling and which are positioned low enough in the rig to avoid interference with operation of the rotary table. The jacking mechanism also includes a structure which is adapted to be connected to the piston and cylinder means when the casing or other well pipe is to be lowered and which is actuable upwardly and downwardly and carries one of two pipe gripping units for progressively jacking the pipe downwardly by vertical reciprocation of that structure. The reciprocating structure may take the form of a beam extending between two pistons and actuable thereby, with a second beam being connected to cylinders within which the pistons are contained and being utilized to support the second gripping element. In one form of the invention, the rotary table when in use is supported by this second beam.
REFERENCES:
patent: 1879929 (1932-09-01), Fortune
patent: 1894039 (1933-01-01), Hill
patent: 2126933 (1938-08-01), Stone et al.
patent: 2641444 (1953-06-01), Moon
patent: 3154146 (1964-10-01), Brown
patent: 3888318 (1975-06-01), Brown
patent: 4085796 (1978-04-01), Council
patent: 4209066 (1980-06-01), Watson
Boyadjieff George I.
Campbell Andrew B.
Green William P.
Neuder William P.
Purser Ernest R.
Varco International, Inc.
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