System for controlling the flow of well fluid

Details System for controlling the flow of well fluid System for controlling the flow of well fluid

E - Fixed Constructions

21

B

E21B 43/12 (2006.01)

Patent

CA 2613115

A system for controlling the flow of well fluid between a well annulus and an internal flowbore of a tubing string, that system comprises a tubular housing in the tubing string having a fluid flow aperture through a tubular wall thereof around said flowbore. A substantially coaxial tubular sleeve adjacent said housing for selectively obstructing the fluid flow area of said flow aperture; a first actuator for selectively displacing said sleeve in a first direction; and a second actuator for incrementally displacing said sleeve in a second direction wherein a fluid flow area through said aperture is changed in corresponding increments, and a force required to displace said sleeve from one flow rate increment to another increases incrementally.

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