The Annulus Operated Tubing Drain is an annulus pressure operated drain valve
that can be opened to allow fluid to drain from the tubing on a trip out. Shear
screws hold the valve closed until enough pressure is applied to the annulus to
shear the screws. Once the valve is opened, it cannot be closed.
that can be opened to allow fluid to drain from the tubing on a trip out. Shear
screws hold the valve closed until enough pressure is applied to the annulus to
shear the screws. Once the valve is opened, it cannot be closed.
