Systems for reversing fluid flow to and from a single-direction fluid flow device

1. A flow reversal system, comprising:

a single direction flow device adapted for receiving a fluid, wherein the single direction flow device is one of a flow meter, a metering valve, or a choke; and

first, second, third and fourth binary valves that are in fluid communication with the single direction flow device wherein, collectively, the first, second, third and fourth binary valves are adapted to be actuated so as to regulate the direction of a flow of the fluid to and from the single direction flow device, wherein said system is adapted to:

be configured in a first position wherein the first and fourth binary valves are open and the second and third binary valves are closed and the fluid flows through the single direction flow device in a first direction;

be configured from the first position to a neutral position by actuating the second and third binary valves from a closed position to an open position wherein, in the neutral position, the first, second, third and fourth binary valves are open and the fluid flows through the single direction flow device in the first direction;

be configured from the neutral position to a second position by actuating the first and fourth binary valves from an open position to a closed position wherein, in the second position, the first and fourth binary valves are closed and the second and third binary valves are opened and the fluid flows through the single direction flow device in the first direction.

2. The system of claim 1 , further comprising:

a first inlet/outlet line in fluid communication with the single direction flow device; and

a second inlet/outlet line in fluid communication with the single direction flow device, wherein when the system is configured in the first position the fluid enters the system via the first inlet/outlet line flows through the single direction flow device in the first direction and leaves the system via the second inlet/outlet line and wherein when the system is configured in the second position the fluid enters the system via the second inlet/outlet line flows through the single direction flow device in the first direction and leaves the system via the first inlet/outlet line.

3. The system of claim 1 , wherein the first, second, third and fourth binary valves comprise at least one of a gate valve or a ball valve.

4. The system of claim 1 , wherein the first, second, third and fourth binary valves are each a gate valve.

5. The system of claim 1 , wherein the first, second, third and fourth binary valves comprise at least one of a hydraulically powered actuator, a pneumatically powered actuator, an electrically powered actuator or a mechanical actuator.

6. The system of claim 1 , wherein the first and second binary valves are adapted to regulate the direction of the flow of the fluid to an inlet of the single direction flow device and the third and fourth binary valves are adapted to regulate the direction of the flow of the fluid from an outlet of the single direction flow device.

7. The system of claim 1 , further comprising a source of methanol that is in fluid communication with an inlet of the single direction flow device.

8. The system of claim 1 , wherein the system is adapted to be operatively coupled to a subsea tree positioned above an oil/gas well and wherein the first, second, third and fourth binary valves are adapted to be configured such that the fluid flowing in the first direction through the single direction flow device is injected into the subsea tree.

9. The system of claim 8 , wherein the single direction flow device is the choke, said choke being an adjustable choke.

10. The system of claim 8 , wherein, by actuation of only two of the first, second, third and fourth binary valves, the first, second, third and fourth binary valves are configured such that the fluid flowing from the subsea tree flows through the single direction flow device in the first direction.

11. The system of claim 1 , further comprising at least one bladder type container that is in fluid communication with the system, wherein a fluid in the at least one bladder type container is adapted to be injected into the system at a point that is on an inlet side of the single direction flow device.

12. The system of claim 1 , wherein the single flow direction device is the flow meter.

13. A flow reversal system, comprising:

a single direction flow device adapted for receiving a fluid, wherein the single direction flow device is one of a flow meter, a metering valve, or a choke;

a first inlet/outlet line in fluid communication with the single direction flow device;

a second inlet/outlet line in fluid communication with the single direction flow device; and

first, second, third and fourth binary valves that are in fluid communication with the single direction flow device wherein the first and second binary valves are adapted to regulate the direction of the flow of the fluid to an inlet of the single direction flow device and the third and fourth binary valves are adapted to regulate the direction of the flow of the fluid from an outlet of the single direction flow device, wherein the system is adapted to:

be configured in a first position wherein the first and fourth binary valves are open and the second and third binary valves are closed and the fluid enters the system via the first inlet/outlet line, the fluid flows through the single direction flow device in a first direction and the fluid exits the system via the second inlet/outlet line;

be configured from the first position to a neutral position by actuating the second and third binary valves from a closed position to an open position wherein, in the neutral position, the first, second, third and fourth binary valves are open and the fluid flows through the single direction flow device in the first direction;

be configured from the neutral position to a second position by actuating the first and fourth binary valves from an open position to a closed position wherein, in the second position, the first and fourth binary valves are closed and the second and third binary valves are opened and the fluid enters the system via the second inlet/outlet line and the fluid flows through the single direction flow device in the first direction and the fluid exits the system via the first inlet/outlet line.

14. The system of claim 13 , wherein the first, second, third and fourth binary valves comprise at least one of a gate valve or a ball valve.

15. The system of claim 14 , wherein the first, second, third and fourth binary valves comprise at least one of a hydraulically powered actuator, a pneumatically powered actuator, an electrically powered actuator or a mechanical actuator.

16. The system of claim 13 , further comprising a source of methanol that is in fluid communication with an inlet of the single direction flow device.

17. The system of claim 13 , wherein the system is adapted to be operatively coupled to a subsea tree positioned above an oil/gas well and wherein the first, second, third and fourth binary valves are adapted to be configured such that the fluid flowing in the first direction through the single direction flow device is injected into the subsea tree.

18. The system of claim 17 , wherein the single direction flow device is the choke, said choke being an adjustable choke.

19. The system of claim 18 , wherein, by actuation of only two of the first, second, third and fourth binary valves, the first, second, third and fourth binary valves are configured such that the fluid flowing from the subsea tree flows through the single direction flow device in the first direction.

20. The system of claim 13 , further comprising at least one bladder type container that is in fluid communication with the system, wherein a fluid in the at least one bladder type container is adapted to be injected into the system at a point that is on an inlet side of the single direction flow device.

21. The system of claim 13 , wherein the single flow direction device is the flow meter.