Gas lift valve assembly

1. An apparatus usable with a well, comprising:

a gas lift valve comprising a check valve element located between an annulus and a passageway of a tubing, the check valve element adapted to selectively allow a flow through the check valve element from an inlet side of the check valve element to an outlet side of the check valve element and biased to prevent a leakage flow through the check valve element from the outlet side to the inlet side; and

an isolation member adapted to:

be run downhole in a first state in which the isolation member isolates the outlet of the check valve element from a fluid pressure exerted by fluid in the annulus or the passageway to prevent the leakage flow, and

in response to a magnitude of the fluid pressure exceeding a threshold, transition to a second state in which the isolation member allows communication of the fluid pressure through the isolation member regardless of the magnitude of the fluid pressure,

wherein the check valve is oriented such that the isolation member is located on the outlet side of the check valve.

2. The apparatus of claim 1 , wherein the check valve element is adapted to establish one way fluid flow between the annulus and the passageway of the tubing.

3. The apparatus of claim 1 , wherein the check valve element is adapted to respond to a pressure differential between the annulus and the passageway of the tubing.

4. The apparatus of claim 1 , wherein the isolation member comprises at least one selected from the list consisting of: (i) a membrane adapted to rupture in response to a pressure differential across the membrane, (ii) a rupture disk, (iii) a sleeve valve.

5. The apparatus of claim 1 , wherein the gas lift valve comprises at least one first port in communication with the annulus and at least one second port in communication with the passageway, and the isolation member is located between said at least one first port and said at least one second port.

6. The apparatus of claim 1 , wherein the gas lift valve comprises one of the following:

a production tubing pressure operated valve and an injection pressure operated valve.

7. A method usable with a well, comprising:

providing a gas lift valve comprising a check valve element to control communication between an annulus of the well and a tubular passageway of the well in response to a pressure, the check valve element adapted to selectively allow a flow through the check valve element from an inlet side of the check valve element to an outlet side of the check valve element and biased to prevent a leakage flow through the check valve element from the outlet to the inlet;

preventing the leakage flow through the check valve element before the gas lift valve is to be operated, the preventing comprising providing an isolation member to, in a first state, isolate the outlet side of the check valve element from the fluid pressure;

in response to a magnitude of the fluid pressure exceeding a threshold, transitioning the isolation member to a second state in which the isolation member allows communication of the fluid pressure through the isolation member regardless of the magnitude of the fluid pressure; and

orienting the check valve such that the isolation member is located on the outlet side of the check valve.

8. The method of claim 7 , wherein the act of isolating comprises:

providing an isolation membrane to isolate pressure from at least one of the annulus and the tubular passageway.

9. The method of claim 7 , further comprising:

rupturing the membrane to enable subsequent operation of the valve element.

10. The method of claim 7 , wherein the act of isolating comprises:

providing a rupture disk to isolate pressure from at least one of the annulus and the tubular passageway.

11. The method of claim 7 , further comprising:

removing the isolation to enable operation of the gas lift valve.