Positive displacement pump monitor

• US 7,401,500 B2
• Filed: 07/07/2006
• Issued: 07/22/2008
• Est. Priority Date: 07/07/2006
• Status: Active Grant

• Current Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Original Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Inventors: Pessin, Jean-Louis, Wago, Toshimichi, St. Michel, Nathan
• Primary Examiner(s): Chapman; John E
• Application Number:
  US11/482,846
• Publication Number:
  US 20080006088A1
• Time in Patent Office: 746 Days
• Field of Search: 73/405.A, 731/68, 735/92
• US Class Current: 73/40.50A
• CPC Class Codes: F04B 2201/0802 Vibration
• CPC Class Codes: F04B 51/00 Testing machines, pumps, or pumping installations
• CPC Class Codes: G01M 3/24 using infrasonic, sonic, or ultrasonic vibrations

Abstract

A positive displacement pump monitor. The monitor includes a sensor coupled to a housing of a pump for obtaining acoustic data therefrom. A proximity switch may be simultaneously used to keep real time timing information relative to the cycling of the pump. A data processor of the monitor may then be employed to analyze acoustic data and timing information to distinguish acceptable noise from leak information. An operator thereby may be warned of the presence of a leak in the pump.

Claims

1. A monitor for a positive displacement pump, the monitor comprising:

a sensor coupled to the pump to obtain acoustic data therefrom during operation of the pump, the acoustic data comprising strike acoustic data and non-strike acoustic data; and

a data processor coupled to the sensor to use the acoustic data and timing information relative to the pump during operation to decipher acoustic data from the strike acoustic data and non-strike acoustic data that is leak information.

2. The monitor of claim 1 further comprising a proximity switch coupled to the pump and said data processor to provide the timing information.

3. The monitor of claim 1 wherein said sensor is an accelerometer.

4. The monitor of claim 1 wherein said data processor deciphers acoustic data that is leak information by distinguishing acoustic data that presents for about the duration of a stroke of the pump as the leak information.

5. The monitor of claim 4 wherein a stroke is one of a discharge stroke and an intake stroke of a plunger with respect to a chamber of the pump.

6. The monitor of claim 5 wherein the discharge stroke of the plunger generates more than about 2,000 pounds per square inch of pressure within the chamber.

7. The monitor of claim 1 wherein said data processor deciphers acoustic data that is leak information by distinguishing non-strike acoustic data that is acceptable noise from non-strike acoustic data that is leak information.

8. The monitor of claim 7 wherein the acoustic data is acoustic data resonating from a strike of a valve of the pump against a valve seat of the pump.

9. The monitor of claim 8 wherein the valve includes a conformable valve insert to contact the valve seat during the strike.

10. A positive displacement pump assembly comprising:

a positive displacement pump having a plunger for effecting pressurization on a chamber of the pump for pushing a fluid therethrough during an operation; and

a monitor having a sensor coupled to the pump to obtain acoustic data from the operation, the acoustic data comprising strike acoustic data and non-strike acoustic data, and a data processor coupled to the sensor to use timing information relative to the pump during the operation and the acoustic data to decipher acoustic data from the strike acoustic data and non-strike acoustic data that is leak information indicative of a leak of the fluid into the chamber.

11. The assembly of claim 10 wherein said positive displacement pump is a first pump, the assembly further comprising:

a second positive displacement pump in fluid communication with said first pump; and

a centralized computer system coupled to the first pump and said second pump for simultaneous monitoring thereof.

12. The assembly of claim 10 wherein the fluid is an abrasive containing fluid, the abrasive selected from sand, a ceramic material, and bauxite.

13. The assembly of claim 10 wherein said pump is of a triplex configuration.

14. A method of monitoring a positive displacement pump, the method comprising:

operating the pump;

obtaining acoustic data from the pump, the acoustic data comprising strike acoustic data and non-strike acoustic data;

recording timing information relative to said operating of the pump; and

analyzing the acoustic data in light of the timing information to decipher acoustic data from the strike acoustic data and non-strike acoustic data that is leak information.

15. The monitor of claim 14 wherein said analyzing further comprises distinguishing acoustic data that presents for about the duration of a stroke of the pump as the leak information.

16. The method of claim 14 wherein said analyzing further comprises distinguishing non-strike acoustic data that is acceptable noise from non-strike acoustic data that is the leak information.

17. The method of claim 14 wherein the pump is of a triplex configuration, said analyzing further comprising monitoring leak information amplitude to decipher leak information attributable to overlapping multiple leaks.

18. The method of claim 14 wherein said operating further comprises pumping an abrasive containing fluid through the pump for a pressurized application.

19. The method of claim 18 wherein the pressurized application is one of cementing, coil tubing, water jet cutting, and hydraulic fracturing.

20. A method of monitoring positive displacement pumps in a pressurized application, the method comprising:

operating the pumps simultaneously;

obtaining acoustic data from each of the pumps, the acoustic data comprising strike acoustic data and non-strike acoustic data;

recording timing information relative to each of the pumps during said operating; and

analyzing the acoustic data for each of the pumps in relation to the timing information for each pump to decipher acoustic data from the strike acoustic data and non-strike acoustic data that is leak information.

21. The method of claim 20 further comprising indicating the leak information at a graphical user interface coupled through a centralized computer system to each of the pumps.

22. The method of claim 20 wherein said analyzing further comprises distinguishing any acoustic data of a given pump that presents for about the duration of a stroke of the given pump as the leak information.

23. The method of claim 20 wherein said analyzing further comprises distinguishing non-strike acoustic data of a given pump that is acceptable noise from non-strike acoustic data of the given pump that is the leak information.