Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1988-09-15
1989-04-25
Novosad, Stephen J.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
166330, 166369, 166386, E21B 2100, E21B 3412, E21B 3416
Patent
active
048238805
ABSTRACT:
A threaded sleeve valve to facilitate the removal of water from gas wells having two or more gas productive zones disposed vertically along their bore. The valve is adapted to form a connection between a segregation packer and a well tubing string. In use, the valve and the segregation packer are sunk in the well to a position intermediate an upper gas productive zone and a lower gas productive zone. During normal gas production, the valve is closed and gas is collected from both zones, the gas from the lower zone passing through a vertical passage defined by the valve and continuous with the interior of the well tubing. Incidental water accumulated above the segregation packer can be removed by opening the valve and using the gas pressure of the lower productive zone to force the accumulated water upwards to the wellhead and out of the well. Once the well bore has been purged of incidental water, the valve is re-closed and normal production resumes. The valve is operated from the surface by turning the well tubing string in the required direction.
REFERENCES:
patent: 2720926 (1955-10-01), Brown
patent: 2815925 (1957-12-01), Fisher, Jr.
patent: 2858099 (1958-10-01), Althouse, Jr. et al.
patent: 2874931 (1959-02-01), Baker et al.
patent: 3493052 (1970-02-01), Evans et al.
patent: 3497009 (1970-02-01), Harrington
patent: 3829245 (1974-08-01), Evans
patent: 4465435 (1984-08-01), Copas
patent: 4573536 (1986-03-01), Lawrence
374928 Alberta Limited
Novosad Stephen J.
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