초록 ▼

The invention relates to valves usable downhole and controlled from the surface hydraulically via control lines or by other techniques. The valve has a minimum flow passage which is preferably oriented along its longitudinal axis and a lateral flow passage which opens upon movement of a valve member

The invention relates to valves usable downhole and controlled from the surface hydraulically via control lines or by other techniques. The valve has a minimum flow passage which is preferably oriented along its longitudinal axis and a lateral flow passage which opens upon movement of a valve member via applied control pressure from the surface. Alternatively, the valve comprises a tapered needle movable in a throat. When the valve member shifts, additional flow area is exposed to control the backpressure of a fluid by way of hydraulic pressure control from the surface via the control line. The hydraulic control can be with a single control line acting on a piston attached to the valve member with a return spring opposing such movement, or alternatively, can be carried out with a pair of control lines to actuate reverse movements of the valve member. A pressurized gas chamber can be used to act as the closing force opposing applied pressure from the control line for a return of the valve to its minimum flow or maximum throttle position. Alternatively, an acoustic, electric or other type of surface-directed signal can change the valve position.

대표청구항 ▼

[ What is claimed is:] [1.] A throttling valve controllable from the surface of a well for downhole use, comprising:a body securable to downhole equipment or tubulars;a valve member strokable between opposed end positions;said valve member translatable in an opening in said body for throttling of a

[ What is claimed is:] [1.] A throttling valve controllable from the surface of a well for downhole use, comprising:a body securable to downhole equipment or tubulars;a valve member strokable between opposed end positions;said valve member translatable in an opening in said body for throttling of a fluid passing through said body as said valve member changes the size of said opening when moved between said opposed end positions;said valve member comprising a housing, said housing comprises a needle extending adjacent an opening in said housing such that flow is through said housing and out through said opening in said housing and past said needle and through said opening in said body, said housing and said needle translate in tandem in said body;a control system mounted at least in part remote from said body at the surface of said well and operatively controlling said valve member;said control system positions and maintains said valve member in at least one position between said opposed end positions.