Wells – Processes – Placing or shifting well part
Patent
1988-05-31
1991-09-17
Neuder, William P.
Wells
Processes
Placing or shifting well part
166123, 166182, E21B 33127
Patent
active
050486136
ABSTRACT:
A well packoff assembly can be set on wireline and reset at a new location on tubing. The packoff assembly has a check valve that actuates when a retrieving tool is lowered into contact with the packoff assembly. The check valve allows fluid below the packoff assembly to flow up if the pressure is greater, but prevents any downward flow. A second port opens to allow downward flow as the retrieving tool releases the slips and seal assembly of the packoff assembly. The packoff assembly is set by a wireline tool which uses a three piece mandrel. The lower piece shears from the intermediate piece once the packer is fully set. The upper piece then separates from the intermediate piece. The intermediate piece stays with the packoff assembly and is sealed in the axial passage to allow the packoff assembly to serve as a bridge plug. The body of the packoff assembly has a set of lower threads engaged by a lower ratchet nut to hold the body in an upper released position after it has been released by the retrievable tool.
REFERENCES:
patent: 3509940 (1970-05-01), Young
patent: 4432418 (1984-02-01), Mayland
patent: 4436150 (1984-03-01), Barker
patent: 4437516 (1984-03-01), Cockrell
patent: 4460041 (1984-07-01), Berryman
patent: 4518037 (1985-05-01), Youngblood et al.
patent: 4545431 (1985-10-01), Fore
patent: 4593765 (1986-06-01), Greenlee
patent: 4648445 (1987-03-01), Caskey
patent: 4648446 (1987-03-01), Fore et al.
patent: 4693309 (1987-09-01), Caskey
patent: 4708208 (1987-11-01), Halbardier
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