Abstract: Pressure relief systems for gas lift valves and mandrels are provided. In an implementation, a gas lift barrier mandrel includes two gas lift valves in series fluid communication. When fluid becomes confined between the two gas lift valves, an expansion volume is provided in one of the gas lift valves for pressure relief of the confined fluid, beginning at a pressure threshold value. The pressure relief may be mediated by a pressure-activated device, a piston, a spring, or a bellows to regulate the expansion of confined pressure. In an implementation, one of the gas lift valves may include a pressure relief valve to vent confined pressure from the gas lift valve to the production tubing or casing annulus. A check valve may be added in series with the pressure relief valve within the gas lift valve to prevent backflow through the pressure relief valve.

Abstract: Pressure relief systems for gas lift valves and mandrels are provided. In an implementation, a gas lift barrier mandrel includes two gas lift valves in series fluid communication. When fluid becomes confined between the two gas lift valves, an expansion volume is provided in one of the gas lift valves for pressure relief of the confined fluid, beginning at a pressure threshold value. The pressure relief may be mediated by a pressure-activated device, a piston, a spring, or a bellows to regulate the expansion of confined pressure. In an implementation, one of the gas lift valves may include a pressure relief valve to vent confined pressure from the gas lift valve to the production tubing or casing annulus. A check valve may be added in series with the pressure relief valve within the gas lift valve to prevent backflow through the pressure relief valve.

Abstract: A gas lift barrier valve mandrel assembly includes a longitudinally extending tubular member that defines a production conduit and has a central longitudinal axis. A side pocket mandrel has a first pocket for accepting a gas lift barrier valve and has a first central axis. The side pocket mandrel has a second pocket for accepting a gas lift barrier valve and has a second central axis. The central axis of the production conduit, first axis and second axis are non-coaxial and are parallel to one another. A passage fluidly connects an outside of the mandrel to an inside of the production conduit and is intersected by the first and second pockets.