Well pipe jack

Details Well pipe jack Well pipe jack

1983-08-11

1984-10-30

Leppink, James A.

Wells

Processes

Placing or shifting well part

166 77, 166 775, 175171, 254 29R, E21B 1910

Patent

active

044795475

ABSTRACT:
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 structure extending between upper ends of the cylinders of those mechanisms and supported from the base through the cylinders, a second 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.

REFERENCES:
patent: Re25680 (1964-11-01), Brown
patent: 1121718 (1914-12-01), Derby et al.
patent: 1586923 (1926-06-01), Townsend
patent: 1883070 (1932-10-01), Stone
patent: 1904256 (1933-04-01), Sheldon
patent: 2090854 (1937-08-01), Timbs
patent: 2126933 (1938-08-01), Stone et al.
patent: 3257099 (1966-06-01), Merritt, Jr.
patent: 3282357 (1966-11-01), Bunn
patent: 3722603 (1973-03-01), Brown
patent: 3722607 (1973-03-01), Ray
patent: 3888318 (1975-06-01), Brown
patent: 3949883 (1976-04-01), Crooke et al.
"New Casing Tools May Eliminate Need For Super Rigs" by Abbott et al., Oil & Gas Journal-Jul. 21, 1980.

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