Apparatus and method for monitoring valve operation

1. An apparatus for monitoring valve operation, comprising: a first acoustic sensor to couple to a valve to detect vibration of the valve;

a second acoustic sensor to detect ambient vibration proximate the valve;

a monitoring system communicatively coupled to the first acoustic sensor and to the second acoustic sensor, the monitoring system configured to:

receive a signal generated by the first acoustic sensor, the signal representative of vibration of the valve;

receive a signal generated by the second acoustic sensor, the signal representative of ambient vibration;

filter the ambient vibration from the signal generated by the first acoustic sensor based on the signal generated by the second acoustic sensor; and

identify a band of frequencies in the signal indicative of leakage; and

identify leakage in the valve based on the signal.

2. The apparatus of claim 1 , wherein the monitoring system is configured to identify the leakage based on amplitude of the signal in the band.

3. The apparatus of claim 1 , wherein the monitoring system is configured to:

identify opening or closing of the valve based on the signal.

4. The apparatus of claim 3 , wherein the monitoring system is configured to measure time during which movement in the valve is associated with the opening or closing of the valve.

5. The apparatus of claim 4 , wherein the monitoring system is configured to identify degradation of the valve based on time for the opening or closing of the valve increasing.

6. The apparatus of claim 1 , wherein the first acoustic sensor comprises an accelerometer or a piezoelectric transducer.

7. The apparatus of claim 1 , wherein the monitoring system is configured to compare the signal generated by the first acoustic sensor to a signal indicative of vibration in the valve while the valve is not leaking to identify the leakage.

8. The apparatus of claim 1 , wherein the monitoring system is configured to:

identify movement in the valve based on the signal; and

identify static friction in the valve by measuring a time difference between initiation of actuation of the valve and the movement in the valve.

9. A well control system,

comprising:

a blowout preventer;

a hydraulics module comprising:

a first valve configured to provide hydraulic pressure to the blow out preventer;

a first acoustic sensor coupled to the first valve to detect vibration of the first valve;

a second acoustic sensor to detect ambient vibration; and

a monitoring system communicatively coupled to the first acoustic sensor and the second acoustic sensor, the monitoring system configured to:

receive a first signal generated by the first acoustic sensor, the first signal representative of vibration of the first valve;

receive a second signal generated by the second acoustic sensor, the second signal representative of ambient vibration;

filter the ambient vibration from the first signal generated by the first acoustic sensor based on the second signal generated by the second acoustic sensor; and

identify a condition of the first valve based on the first signal.

10. The well control system of claim 9 , wherein the condition comprises at least one of fluid leakage in the first valve and operation of the first valve.

11. The well control system of claim 9 , wherein the monitoring system is configured to identify a band of frequencies in the signal indicative of fluid leakage in the first valve, and identify fluid leakage in the first valve based on amplitude of the signal in the band.

12. The well control system of claim 10 , wherein the operation of the first valve comprises opening or closing of the first valve.

13. The well control system of claim 10 , wherein the monitoring system is configured to measure time during which movement in the valve is associated with the opening or closing of the valve.

14. The well control system of claim 13 , wherein the monitoring system is configured to identify wear of the first valve based on an increase or decrease in time for the opening or closing of the first valve.

15. The well control system of claim 9 , wherein the hydraulic module comprises:

a plurality of valves configured to provide hydraulic pressure to the blow out preventer;

and a plurality of acoustic sensors, each of the acoustic sensors coupled to one of the valves to detect vibration in one of the valves; and

wherein the monitoring system is communicatively coupled to the acoustic sensors, and the monitoring system is configured to:

receive signals generated by the acoustic sensors, the signals representative of vibration of the valves; and;

identify a condition of each of the valves based on the signals.

16. The well control system of claim 15 , wherein the monitoring system is configured to compare each of the signals generated by the acoustic sensors to a signal indicative of vibration in the valves while the valves are not leaking to identify leakage in each of the valves.

17. The well control system of claim 9 , wherein the monitoring system is configured to:

identify movement in the first valve based on the first signal; and

identify static friction in the first valve by measuring a time difference between initiation of actuation of the first valve and the movement in the first valve.

18. A fluid control assembly,

comprising: a first valve to control flow of fluid;

a second valve to control flow of fluid;

a first acoustic sensor coupled to the first valve to detect vibration of the first valve; a second acoustic sensor coupled to the second valve to detect vibration of the second valve;

a third acoustic sensor to detect ambient vibration; and

a monitoring system communicatively coupled to the first acoustic sensor, the second acoustic sensor, and the third acoustic sensor, the monitoring system configured to:

receive signals generated by the first acoustic sensor and the second acoustic sensor that are representative of vibration of the first valve and the second valve;

receive a signal generated by the third acoustic sensor that is representative of ambient vibration;

identify a condition of each of the first valve and the second valve based on the signals received from the first acoustic sensor, the second acoustic sensor, and the third acoustic sensor.

19. The fluid control assembly of claim 18 , the condition comprises at least one of fluid leakage in and operation of the first valve and at least one of fluid leakage in and operation of the second valve.

20. The fluid control assembly of claim 19 , wherein the monitoring system is configured to identify a band of frequencies in the signal generated by the first acoustic sensor that is indicative of fluid leakage in the first valve, and identify fluid leakage in the first valve based on amplitude of the signal in the band.

21. The fluid control assembly of claim 19 , wherein the monitoring system is configured to:

measure time during which movement in each of the first valve and the second valve is associated with the opening or closing; and

identify degradation of the each of the first valve and the second valve based on time for the opening or closing increasing or decreasing.

22. The fluid control assembly of claim 19 , wherein the monitoring system is configured to:

identify movement in the first valve based on the signals generated by the first acoustic sensor; and

identify static friction in the first valve by measuring a time difference between initiation of actuation of the first valve and the movement in the first valve.