Chemical injection valve with openable bypass

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

E - Fixed Constructions

21

B

166/41

E21B 34/00 (2006.01) E21B 34/06 (2006.01) E21B 41/02 (2006.01)

Patent

CA 1197458

CHEMICAL INJECTION VALVE WITH OPENABLE BYPASS Abstract of the Disclosure 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 up- stream 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 prevent- ing backflow therethrough regardless of whether the bypass is open or closed.

417508

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