Apparatus for use in lowering casing strings

Details Apparatus for use in lowering casing strings Apparatus for use in lowering casing strings

1979-12-10

1981-06-16

Cherry, Johnny D.

Handling: hand and hoist-line implements

Grapple

Well type

166212, 166215, 294 8617, 294 8625, 294 96, E21B 3120

Patent

active

042733723

ABSTRACT:
An apparatus for use in lowering casing strings or other parts from a floating unit to a subsea well which includes an expansion-type casing running tool employing extendible latches that have left-handed threads cut on their exterior for engagement with similar threads on the inside of the casing which is to be lowered. Tapered blocks are spring loaded for expanding the dogs into position and hydraulic pressure is used to retract the blocks thus disengaging the running tool from the equipment just lowered. If disengagement of the latches is not accomplished, the running tool can be removed from the casing by left-handed rotation.

REFERENCES:
patent: 1616978 (1927-02-01), MacClatchie
patent: 1815462 (1931-07-01), Denney
patent: 2435899 (1948-02-01), Page
patent: 2815080 (1957-12-01), Long
patent: 2874784 (1959-02-01), Baker et al.
patent: 3278220 (1966-10-01), Wilson
patent: 3528500 (1970-09-01), Brown

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