Wells – Valves – closures or changeable restrictors – Fluid operated
Reexamination Certificate
2005-04-19
2005-04-19
Bagnell, David (Department: 3672)
Wells
Valves, closures or changeable restrictors
Fluid operated
C166S325000
Reexamination Certificate
active
06880639
ABSTRACT:
A system for the downhole injection of chemical into a well through capillary tubing using a surface chemical pump includes downhole injection valve. The downhole injection valve includes an upstream and a downstream check valve connected in series. The upstream check valve has an adjustable spring bias. The amount of bias is dependent on the nature of the well and the system for inserting chemical through the capillary tube into the well. The lower check valve has a fixed bias and protects the injection valve from the unwanted backflow of gas, fluids or solids.
REFERENCES:
patent: 2847074 (1958-08-01), Maly et al.
patent: 3087551 (1963-04-01), Kerver
patent: 3205955 (1965-09-01), Whittle
patent: 3444886 (1969-05-01), Bailey et al.
patent: 3455382 (1969-07-01), Chenoweth
patent: 3473611 (1969-10-01), Gregston
patent: 4063594 (1977-12-01), Canterbury
patent: 4087207 (1978-05-01), Chappell et al.
patent: 4326585 (1982-04-01), McStravick
patent: 4393928 (1983-07-01), Warnock, Sr.
patent: 4399871 (1983-08-01), Adkins et al.
patent: 4424862 (1984-01-01), Munari et al.
patent: 4441558 (1984-04-01), Welch et al.
patent: 4485876 (1984-12-01), Speller
patent: 4552218 (1985-11-01), Ross et al.
patent: 4589495 (1986-05-01), Langer et al.
patent: 4648457 (1987-03-01), Ross et al.
patent: 4977927 (1990-12-01), Hill
patent: 5141056 (1992-08-01), Tailby
patent: 6622795 (2003-09-01), Hebert et al.
patent: 6666273 (2003-12-01), Laurel
patent: 20030121654 (2003-07-01), Carlin
Rhodes R. David
Welch Joe B.
Bagnell David
RW Capillary Tubing Accessories, L.L.C.
Stephenson Daniel P
Strasburger & Price LLP
Thiele Alan R.
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