Manifolds for providing hydraulic fluid to a subsea blowout preventer and related methods

1. A manifold for providing hydraulic fluid to a hydraulically actuated device of a blowout preventer, the manifold comprising:

two or more subsea valve modules, each comprising:

one or more inlets, each configured to receive hydraulic fluid from a fluid source;

one or more outlets, each in selective fluid communication with at least one of the one or more inlets;

one or more vents, each configured to direct hydraulic fluid that flows through the vent to at least one of a reservoir and a subsea environment; and

one or more subsea valve assemblies, each changeable between:

a first state in which at least a first one of the outlet(s) is in fluid communication with at least a first one of the inlet(s);

a second state in which the first outlet is in fluid communication with at least a first one of the vent(s); and

a third state in which neither the first inlet nor the first vent is in fluid communication with the first outlet;

where at least one of the inlet(s) of a first one of the subsea valve modules is configured to receive hydraulic fluid from a first fluid source, and at least one of the inlet(s) of a second one of the subsea valve modules is configured to receive hydraulic fluid from a second fluid source that is separate from the first fluid source; and

where at least one of the outlet(s) of the first subsea valve module is configured to be in simultaneous fluid communication with at least outlet(s) of the second subsea valve module and an actuation port of the hydraulically actuated device.

2. The manifold of claim 1 , where:

the first subsea valve module is configured to be coupled to the second subsea valve module to define one or more conduits; and

the conduit(s) are each:

in fluid communication with at least one of the outlet(s) of each of the first and second subsea valve modules; and

configured to communicate hydraulic fluid to a respective actuation port of the hydraulically actuated device.

3. The manifold of claim 1 , where at least one of the subsea valve modules comprises one or more isolation valves configured to selectively block fluid communication through at least one of the inlet(s).

4. The manifold of claim 3 , where at least one of the isolation valve(s) is configured to automatically block fluid communication through at least one of the inlet(s) upon decoupling of the fluid source from the subsea valve module.

5. The manifold of claim 1 , where at least one of the subsea valve modules comprises one or more isolation valves configured to selectively block fluid communication through at least one of the outlet(s).

6. The manifold of claim 5 , where at least one of the isolation valve(s) is configured to automatically block fluid communication through at least one of the outlet(s) upon decoupling of another of the subsea valve modules from the subsea valve module.

7. The manifold of claim 1 , where, for at least one of the subsea valve modules,

at least one of the one or more subsea valve assemblies comprises:

a first two-way valve configured to selectively allow fluid communication from at least one of the inlet(s) to at least one of the outlet(s); and

a second two-way valve configured to selectively divert hydraulic fluid from at least one of the one of the outlet(s) to at least one of the vent(s).

8. The manifold of claim 1 , comprising:

one or more sensors configured to capture data indicative of at least one of hydraulic fluid pressure, temperature, and flow rate; and

a processor configured to control, based at least in part on the data captured by the sensor(s), actuation of at least one of the subsea valve assemblies.

9. The manifold claim 1 , where at least one of the subsea valve assemblies comprises a hydraulically actuated main stage valve.

10. The manifold of claim 9 , where at least one of the subsea valve assemblies comprises a pilot stage valve configured to actuate the main stage valve.

11. The manifold of claim 10 , where the pilot stage valve is integrated with the main stage valve.

12. The manifold of claim 1 , where at least one of the subsea valve assemblies comprises a bi-stable valve.

13. The manifold of claim 1 , comprising one or more batteries in electrical communication with at least one of the subsea valve assemblies.

14. The manifold of claim 1 , where the manifold does not comprise a shuttle valve.

15. The manifold of claim 1 , where:

the two or more subsea valve modules comprise three or more subsea valve modules;

at least one of the inlet(s) of a third one of the subsea valve module is configured to receive hydraulic fluid from a third fluid source that is separate from the first and second fluid sources; and

at least one of the outlet(s) of the first subsea valve module is configured to be in simultaneous fluid communication with at least one of the outlet(s) of the second subsea valve module, at least one of the outlet(s) of the third subsea valve module, and an actuation port of the hydraulically actuated device.

16. A method for providing hydraulic fluid to a hydraulically actuated device of a blowout preventer, the method comprising:

connecting two or more subsea valve modules together, each of the subsea valve modules

comprising:

an inlet;

an outlet;

a vent configured to direct hydraulic fluid that flows through the vent to at least one of a reservoir and a subsea environment; and

a subsea valve assembly that is changeable between:

a first state in which the outlet is in fluid communication with the inlet;

a second state in which the outlet is in fluid communication with the vent; and

a third state in which neither the inlet nor the vent is in fluid communication with the outlet;

where connecting the subsea valve modules is performed such that the outlets of the subsea valve modules are each in fluid communication with each other; and

coupling:

the subsea valve modules to an actuation port of the hydraulically actuated device such that the actuation port is in fluid communication with the outlets of each of the subsea valve modules;

a first fluid source to a first one of the subsea valve modules; and

a second fluid source that is separate from the first fluid source to the inlet of a second one of the subsea valve modules.

17. The method of claim 16 , comprising:

for each of the subsea valve modules, actuating the subsea valve assembly such that the subsea valve assembly changes to the first state; and

providing hydraulic fluid simultaneously from the first fluid source and the second fluid source to the actuation port of the hydraulically actuated device.

18. The method of claim 17 , where for each of the subsea valve modules: the subsea valve assembly comprises:

a first two-way valve configured to selectively allow fluid communication from the inlet to the outlet; and

a second two-way valve configured to selectively divert hydraulic fluid from the outlet to the vent; and

actuating the subsea valve assembly comprises actuating the first two-way valve such that the subsea valve assembly changes to the first state.

19. The method of claim 16 , comprising coupling a third fluid source that is separate from each of the first and second fluid sources to the inlet of a third one of the subsea valve modules.

20. The method of claim 19 , comprising:

for each of the subsea valve modules, actuating the subsea valve assembly such that the subsea valve assembly changes to the first state; and

providing hydraulic fluid simultaneously from the first, second, and third fluid sources to the actuation port of the hydraulically actuated device.