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:

first and second 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; and

one or more subsea valve assemblies, each configured to selectively control hydraulic fluid communication from at least one of the one or more inlets to at least one of the one or more outlets;

where the one or more inlets of the first subsea valve module are configured to be coupled to a first fluid source and the one or more inlets of the second subsea valve module are configured to be coupled to a second fluid source and not to the first fluid source; and

where at least one of the one or more outlets of the first subsea valve module and at least one of the one or more outlets of the second subsea valve module are configured to be in simultaneous fluid communication with an inlet of an actuation port of the hydraulically actuated device.

2. 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 one or more inlets.

3. The manifold of claim 2 , where at least one of the one or more isolation valves is configured to automatically block fluid communication through at least one of the one or more inlets upon decoupling of the fluid source from the subsea valve module.

4. 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 one or more outlets.

5. The manifold of claim 4 , where at least one of the one or more isolation valves is configured to automatically block fluid communication through at least one of the one or more outlets upon decoupling of another of the subsea valve modules from the subsea valve module.

6. The manifold of claim 1 , where at least one of the subsea valve assemblies comprises:

a first two-way valve configured to selectively allow fluid communication from at least one of the one or more inlets to at least one of the one or more outlets; and

a second two-way valve configured to selectively divert hydraulic fluid from at least one of the one or more outlets to at least one of a reservoir and a subsea environment.

7. 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 data captured by the one or more sensors, actuation of at least one of the subsea valve assemblies.

8. The manifold of claim 1 , where the manifold is configured to allow at least one of the outlets to be in simultaneous fluid communication with at least two of the inlets.

9. The manifold of claim 1 , where at least one of 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. A method for providing hydraulic fluid to a hydraulically actuated device of a blowout preventer, the method comprising:

coupling at least a first fluid source and a second fluid source into fluid communication with an actuation port of the hydraulically actuated device;

where the coupling is such that:

the first fluid source is coupled to a first inlet of a manifold having an outlet in fluid communication with the first inlet and the hydraulically actuated device; and

the second fluid source is coupled to a second inlet of the manifold and not to the first inlet, the second inlet in fluid communication with the outlet.

16. The method of claim 15 , comprising coupling a third fluid source into fluid communication with the actuation port of the hydraulically actuated device such that the third fluid source is coupled to a third inlet of the manifold, the third inlet in fluid communication with the outlet.

17. The method of claim 16 , comprising providing hydraulic fluid to the hydraulically actuated device simultaneously from the first fluid source, the second fluid source, and the third fluid source.

18. The method of claim 15 , comprising providing hydraulic fluid to the hydraulically actuated device simultaneously from the first fluid source and the second fluid source.

19. The method of claim 15 , comprising providing hydraulic fluid to the hydraulically actuated device from the first fluid source before providing hydraulic fluid to the hydraulically actuated device from the second fluid source.

20. The method of claim 15 , comprising adjusting a pressure of the first fluid source to a higher pressure than a pressure of the second fluid source.