Patent ID: 8347969

Claim:
A pressure relief device for compensating for a change in pressure within an isolated outside environment within a wellbore, the pressure relief device comprising: a tubular member having an outer wall surface and an inner wall surface defining a bore; a housing disposed on the outer wall surface of the tubular member, the housing having a port and an inner wall surface defining a housing chamber; a piston disposed within the housing chamber, the piston being in sliding engagement with the outer wall surface of the tubular member and the inner wall surface of the housing chamber defining a hydrostatic chamber and a sealed chamber within the housing chamber, the port being in fluid communication with the hydrostatic chamber; an upper wellbore barrier operatively associated with the tubular member; a lower wellbore barrier operatively associated with the tubular member, the lower wellbore barrier being disposed below the upper wellbore barrier; and a passage in fluid communication with the sealed chamber, the passage providing fluid communication through the upper wellbore barrier, wherein the piston moves within the housing chamber due to a change in pressure within an isolated outside environment.