Method and apparatus for injecting gas into a reservoir

1. A method of actuating a downhole tool, the method comprising:

running a downhole tool into a well, the downhole tool comprising:

a first sealing element;

a second sealing element disposed below the first sealing element;

an isolation valve disposed below the second sealing element; and

a cross over disposed above the isolation valve;

actuating the first sealing element, wherein the actuating the first sealing element comprises:

creating a pressure differential between a tubular and a well wall of the well;

upwardly stroking a setting piston of the downhole tool; and

radially expanding the first sealing element into contact with the well wall;

actuating the second sealing element;

opening the isolation valve; and

removing a setting tool from the first sealing element.

2. The method of claim 1 , wherein actuating the second sealing element comprises:

creating a second pressure differential between the tubular and the well wall;

stroking a second setting piston of the downhole tool upward; and

radially expanding the second sealing element into contact with the well wall.

3. The method of claim 2 , wherein actuating the isolation valve comprises:

creating a third pressure differential between the tubular and the well wall; and

shearing at least one shear screw disposed on the isolation valve.

4. The method of claim 1 , further comprising relieving pressure from the tubular in fluid communication with the downhole tool.

5. The method of claim 1 , wherein the actuating the first sealing element, the actuating the second sealing element, and the actuating the isolation valve occur in a single trip into the well.

6. The method of claim 1 , wherein opening the isolation valve comprises causing a sleeve to move from a closed position to an open position, wherein the sleeve in the closed position blocks a port, and the sleeve in the open position allows fluid communication from an outer annulus between the downhole tool and the well wall to an inner flowpath at least partially within the downhole tool, via the port.

7. The method of claim 6 , wherein the inner flowpath is at least partially defined on a radial inside by an inner conduit, the inner flowpath fluidly communicating with a first flowpath through the cross over, and wherein an interior of the inner conduit communicates with a second flowpath through the cross over, the first and second flowpaths being isolated from one another.

8. The method of claim 7 , wherein causing the sleeve to move comprises applying a pressure to the inner flowpath, and wherein the sleeve is in pressure communication with the outer annulus, such that the pressure differential is applied across the sleeve, causing the sleeve to move.