Patent ID: 9580991
Date: 2017-02-28
CPC Classifications: E21B,F16K,Y10T

Claim:
1. A shear valve for use in a downhole tool between an annulus and tubing in a well for injecting an injection fluid into the tubing, comprising: an outer housing and an internal body which is movable in a longitudinal direction within the housing between a closed position and an open position when the valve is activated, whereby when in said closed position the internal body rests on a valve seat inside the housing such that a seal is formed, a locking device arranged to deactivate at a predetermined locking device deactivation pressure, whereby when said locking device deactivation pressure is reached from an annulus side of the valve the locking device will deactivate, thereby allowing the internal body to move to an open position whereby the internal body is positioned away from the valve seat such that the injection fluid is allowed to flow into the tubing, and an obstruction device which, when active, is arranged to obstruct the internal body from moving within the housing, thus allowing pressurizing from the annulus side of the valve without the valve opening, which obstruction device is capable of being deactivated by pressurizing from a tubing side of the valve such that the obstruction device, when in a deactivated state, is arranged to allow the internal body to move within the housing.