Compact dual packer with locking dogs

Details Compact dual packer with locking dogs Compact dual packer with locking dogs

1991-05-30

1992-08-25

Bui, Thuy M.

Wells

Packers or plugs

With expanding anchor

166182, E21B 33129

Patent

active

051410532

ABSTRACT:
A compact, retrievable packer has a unitary mandrel body which is intersected by one or more longitudinal production bores. The running length of the packer is reduced and premature set/release are prevented by a lock assembly which releasably locks the lower setting wedge to the packer mandrel. The lock assembly includes one or more locking dogs mounted within mandrel pockets for radial extension and retraction. The locking dogs are extended into an annular slot formed between a retainer collar and the packer mandrel. The lower setting wedge is secured by threaded engagement with the retainer collar. When the locking dogs are extended, the lower setting wedge is blocked against longitudinal displacement, thereby opposing setting forces applied to anchor slips. The locking dogs are held in the locked position by brace rods which are releasably blocked by a shifting sleeve mounted in one of the packer mandrel bores.

REFERENCES:
patent: 4216827 (1980-08-01), Crowe
patent: 4423777 (1984-01-01), Mullins et al.
patent: 4936387 (1990-06-01), Rubbo

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