Patent ID: 8881825

Claim:
A gas lift barrier valve mandrel assembly, comprising: a longitudinally extending tubular member defining a production conduit and having a central longitudinal axis; a side pocket mandrel having a first pocket for accepting a gas lift barrier valve, the first pocket having a first central axis; a first gas lift barrier valve located in the first pocket wherein the first gas lift barrier valve contacts an inner surface of the first pocket to form a seal and divide the first pocket into a first sealed side and a second sealed side; the side pocket mandrel having a second pocket for accepting a gas lift barrier valve, the second pocket having a second central axis; wherein the central axis of the production conduit, first axis and second axis are non-coaxial and are parallel to one another; a first passage fluidly connecting an outside of the mandrel to an inside of the first pocket; a second passage fluidly connecting the inside of the first pocket to an inside of the second pocket; a third passage fluidly connecting the inside of the second pocket to the production conduit; a fourth passage connecting the first pocket to the production conduit and allowing insertion of the first gas lift barrier valve into the first pocket; and a fifth passage connecting the second pocket to the production conduit and allowing insertion of a gas lift barrier valve into the second pocket.