Wells – Valves – closures or changeable restrictors – Operated by dropped element
Patent
1991-04-23
1992-08-25
Dang, Hoang C.
Wells
Valves, closures or changeable restrictors
Operated by dropped element
166237, 166321, 166322, 166323, E21B 3410, E21B 3414
Patent
active
051410567
ABSTRACT:
Injection valve for injecting chemicals into subsurface formations penetrated by an oil or gas well, comprising a cylindrical housing (10) with seals (24A, 24B) for cooperation with well tubing (100), said housing enclosing a cylindrical chamber (1) in which a piston-like sleeve (2) is movable axially so as to cover or uncover one or more radial ports (10A) through a cylindrical wall of said housing (10). A spring (3) normally urge the sleeve (2) to a position in which the ports (10A) are covered. A collet (4) is mounted for axial displacement in a chamber extension (1A) beyond an inner end of the sleeve (2), a compression spring (5) urging the collet against said inner end of the sleeve (2). A device (40) is provided for displacing the collet (4) to an inner end position in the chamber extension (1A) and for activating locking mechanism (4F, 9) for locking the collet (4) in the inner end position, whereby an increased pressure within the chamber (1) is able to move the sleeve (2) so as to uncover the ports (10A) for an injection operation.
REFERENCES:
patent: 3007524 (1961-11-01), Pistole et al.
patent: 3051243 (1962-08-01), Grimmer et al.
patent: 4399871 (1983-08-01), Adkins et al.
patent: 4441558 (1984-04-01), Welch et al.
patent: 4494608 (1985-01-01), Williams et al.
patent: 4552218 (1985-11-01), Ross et al.
patent: 4766960 (1988-08-01), Williamson, Jr.
Dang Hoang C.
Den Norske Stats Oljeselskap A.S
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