Casing hanger packoff retrieving tool

Details Casing hanger packoff retrieving tool Casing hanger packoff retrieving tool

1988-12-16

1990-08-28

Focarino, Margaret A.

Handling: hand and hoist-line implements

Grapple

Well type

294 8625, 166120, E21B 3112

Patent

active

049519883

ABSTRACT:
The retrieving tool for retrieving a packoff from a casing hanger located in a subsea well has a pressure intensifying assembly. The retrieving tool has a mandrel which is connected to a string of conduit lowered from a floating vessel. A body is carried by the mandrel for landing on the casing hanger. A mandrel piston is located on the mandrel for movement with the mandrel and sealingly engages the bore of the body. This results in a pressure chamber above the mandrel piston, which is filled with a hydraulic fluid. A retrieving piston has a retrieving sleeve that latches into the packoff. The retrieving piston is carried above the mandrel piston in fluid communication with the pressure chamber. The pressure areas of the retrieving piston and the mandrel piston are dimensioned so that an increase of pressure due to movement of the mandrel piston will cause a greater force to be exerted by the retrieving piston.

REFERENCES:
patent: 1917135 (1933-07-01), Littell
patent: 2829716 (1958-04-01), Stewart
patent: 3011557 (1961-12-01), Conrad
patent: 3265431 (1966-08-01), Burner
patent: 3944273 (1976-03-01), Ahlstone
patent: 4273372 (1981-06-01), Sheshtawy

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