Patent ID: 7063152

Claim:
A valve assembly for selectively providing fluid communication with a wellbore annulus comprising: a completion string; a tubular inner mandrel defining a flowbore within and having first and second ends disposed in the completion string; a fluid flow port disposed within the inner mandrel to permit fluid communication between the flowbore and an annulus area radially exterior of the inner mandrel after the completion string has been at least partially cemented in the wellbore; an outer sleeve radially surrounding the inner mandrel, the outer sleeve being moveable with respect to the inner mandrel between a substantially open position, wherein the outer sleeve substantially does not block the fluid flaw port, and a substantially closed position, wherein the outer sleeve substantially does block the fluid flow port; and a frangible rupture member disposed within the fluid flow port, the rupture member being rupturable in response to a first level of fluid pressure within the flowbore.