Retrieval tool for back pressure valve and tree test plug

Details Retrieval tool for back pressure valve and tree test plug Retrieval tool for back pressure valve and tree test plug

1996-08-19

1998-07-21

Suchfield, George A.

Wells

Above ground apparatus

With assembly or disassembly means

166 98, 166237, 294 8618, 294 8625, E21B 2300

Patent

active

057822972

ABSTRACT:
A retrieval tool for retrieving a back pressure valve and tree test plug (generally, a check valve) has a spear formed as a solid ring at the bottom with free fingers extending upward. The fingers are resilient and have protrusions adapted to engage a retrieval groove in the check valve. A wedge ring is provided on the tool body to positively lock the fingers in radially outward engagement with the retrieval groove. The wedge ring is fixed to the body by a shear pin so that upon a predetermined axial force the pin shears and releases the wedge ring allowing withdrawal of the tool assembly, if the check valve is stuck in a tubing hanger or coupling.

REFERENCES:
patent: 2994280 (1961-08-01), Daffin
patent: 3645328 (1972-02-01), Greene, Jr.
patent: 3856081 (1974-12-01), Canalizo
patent: 3874447 (1975-04-01), McGowen, Jr.
patent: 4153111 (1979-05-01), Lans et al.
patent: 4254983 (1981-03-01), Harris
patent: 4625381 (1986-12-01), Gravonia, jr. et al.
patent: 4793411 (1988-12-01), Zunkel
patent: 5145228 (1992-09-01), Boyle
patent: 5474124 (1995-12-01), Samuels et al.

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