Wells – Valves – closures or changeable restrictors
Patent
1979-05-07
1981-02-03
Pate, III, William F.
Wells
Valves, closures or changeable restrictors
166189, 166208, 285 3, 285 23, 285 39, 403 2, 403 3, 403 12, E21B 2302
Patent
active
042483077
ABSTRACT:
The present invention provides a latch assembly carriable on a tubing string extendible into a subterranean well, the latch assembly being selectively engageable between upper and lower sections of the tubing string. The latch assembly comprises an outer housing and an inner body, with latching means carried on one of the housing and the body for selectively securing the latch apparatus to the lower section. Latch engaging means are carried on the other of the housing and the body and the lower tubing section for selective co-engagement between the latching means, the lower tubing section, and one of the housing and the body. Piston means are on one of the housing and the body and have a piston head with first and second piston chambers between the piston head. Control means are removable from the latch assembly to direct fluid pressure transmitted through the tubing string to the latch assembly and having passageways to selectively provide a first fluid flow path within the control means and the latch assembly to one of the upper and lower piston chambers to shift the housing and the body relative to one another to release the latching means from the lower section. The control means has passageways selectively providing a second fluid flow path therethrough to the other of the upper and lower piston chambers to shift the housing and the body relative to one another to engage or re-engage the latching means to the lower section.
REFERENCES:
patent: 3603401 (1971-09-01), Nelson
patent: 3830295 (1974-08-01), Crowe
patent: 4098334 (1978-07-01), Crowe
patent: 4143712 (1979-03-01), James
Silberman Raphael J.
Smith Everett H.
Tilton Frederick T.
Wichkoski Dennis A.
Baker International Corporation
Norvell, Jr. William C.
Pate III William F.
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