Wells – Packers or plugs – With expanding anchor
Patent
1984-12-13
1985-09-03
Leppink, James A.
Wells
Packers or plugs
With expanding anchor
1661176, E21B 2303
Patent
active
045386811
ABSTRACT:
A soft set and pull latch for setting and pulling a measuring instrument in a well conduit. The latch includes a body with a seal, a fishing shoulder and a no-go shoulder. A measuring instrument support is attached to the body by a shock absorber. Locking dogs are radially and longitudinally movable in the body. A dog expander sleeve includes a recess for allowing the dogs to retract and includes a shoulder for locking the dogs outwardly. A locking spring urges the dogs downwardly onto the sleeve shoulder but allows the dogs to move upwardly into alignment with the sleeve recess. A releasing spring acts on the expander sleeve for urging the sleeve upwardly for moving the sleeve shoulder under the dogs but allows the dogs to retract into the sleeve recess on downward movement of the sleeve relative to the body. The body may include pressure equalizing ports and a pressure prong releasably positioned in the body and initially blocking the port.
REFERENCES:
patent: 2737245 (1956-03-01), Knox
patent: 3163225 (1964-12-01), Perkins
patent: 3957260 (1976-05-01), Martin
patent: 4159643 (1979-07-01), Watkins
Camco Incorporated
Leppink James A.
Letchford John F.
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