Chemical injection valve with openable bypass

Details Chemical injection valve with openable bypass Chemical injection valve with openable bypass

1981-12-16

1983-08-23

Purser, Ernest R.

Wells

Valves, closures or changeable restrictors

Fluid operated

166321, 1375395, 137 70, E21B 3400

Patent

active

043998712

ABSTRACT:
A combination well flow control device having a passage therethrough for conducting fluids from the exterior to the interior of the tubing, this device having pressure responsive valve means therein for controlling flow of fluids such as well treating chemicals through the flow passage at very low rates and also having a bypass passage which is initially closed by a sleeve valve but which is openable to permit high injection rates therethrough as for injecting water or the like fluid into the tubing at a very high rate as for killing the well. When the sleeve valve has been moved to bypass opening position, the valve flow passage is short-circuited through the bypass, and in one embodiment that portion upstream of the sleeve valve is shut off. After the sleeve valve has been moved to open position, it will remain at that position. The device also includes a check valve for preventing backflow therethrough regardless of whether the bypass is open or closed.

REFERENCES:
patent: 1896706 (1933-02-01), Grimes
patent: 2726723 (1955-12-01), Wilhoit et al.
patent: 3993129 (1976-11-01), Watkins
patent: 4039031 (1977-08-01), Crowe
patent: 4325431 (1982-04-01), Alkerman

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