Wells – Means for forming filter beds
Patent
1988-02-23
1989-09-05
Dang, Hoang C.
Wells
Means for forming filter beds
166120, 166124, 166125, 166134, 166237, E21B 2306, E21B 33128, E21B 4304
Patent
active
048629570
ABSTRACT:
A packer and service tool assembly for oil or gas well preparation includes a disengageable coupling mechanism which permits the tool to be screwed into and out of the packer and which can be hydraulically disengaged so that the tool can be removed without applying torque to the tool or workstring. A releasable ratchet mechanism is also provided in the packer for trapping the setting loads when the packer is set in the casing. The ratchet mechanism is releasable by pulling up a housing portion which cammingly engages collapsible ratchet fingers thereby disengaging the ratchet finger trapping teeth from a stationary ratchet ring.
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patent: 4570714 (1986-02-01), Turner et al.
patent: 4601492 (1986-07-01), George
patent: 4660637 (1987-04-01), McGill et al.
Dang Hoang C.
Dowell Schlumberger Incorporated
Littlefield S. A.
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