Well lock having retractable no-go dogs

Details Well lock having retractable no-go dogs Well lock having retractable no-go dogs

1985-05-20

1986-06-17

Novosad, Stephen J.

Wells

Expansible anchor or casing

Expansible means translated by wedge or cam

166237, E21B 2302

Patent

active

045950547

ABSTRACT:
A well lock including a landing nipple having a locking notch and landing shoulder and a lock for setting in the nipple. The lock includes a body and at least one retractable no-go dog radially movable in the body and adapted to engage the landing shoulder and at least one locking dog radially movable in the body and adapted to lock in the locking notch. A rigid expander tube telescopically moves in the body between a running and a set position. In a running position the no-go locking dogs are cammed outwardly while the locking dogs are retracted. When the set position is reached the locking dogs are cammed outwardly and a recess is aligned with the no-go dogs for allowing them to retract. A seal is provided between the body and the expander tube for protecting the nipple from well fluid abrasion.

REFERENCES:
patent: 2887163 (1959-05-01), McGowen, Jr. et al.
patent: 3507329 (1970-04-01), Stone, Jr.
patent: 4161984 (1979-07-01), Watkins
patent: 4457368 (1984-07-01), Knierimen et al.
patent: 4522259 (1985-06-01), Akkerman
patent: 4545434 (1985-10-01), Higgins
General catalog of 1975-76 Equipment and Services of Camco, Incorporated (p. 49).

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