System and method for determining pump underperformance

• US 7,406,398 B2
• Filed: 05/06/2004
• Issued: 07/29/2008
• Est. Priority Date: 06/05/2004
• Status: Expired due to Fees

• Current Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Original Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Inventors: Dolejsi, Jan, Vizurraga, Antonio, Ollre, Albert G.
• Primary Examiner(s): Bui; Bryan
• Assistant Examiner(s): TEIXEIRA MOFFAT, JONATHAN CHARLES
• Application Number:
  US10/840,568
• Publication Number:
  US 20050251362A1
• Time in Patent Office: 1,545 Days
• Field of Search: 702/182
• US Class Current: 702/182
• CPC Class Codes: E21B 43/121 Lifting well fluids monitoring of down-hole pump systems E21B47/008
• CPC Class Codes: E21B 47/008 Monitoring of down-hole pump systems, e.g. for the detection of "pumped-off" conditions
• CPC Class Codes: F04D 15/0088 Testing machines

Abstract

A system and method are provided for identifying underperformance in a pumping system used to produce a desired fluid. Various conditions are sensed during operation of the pumping system, and those sensed conditions are used to determine measured parameters that are provided with an associated confidence factor. The measured parameters in conjunction with the confidence factors are compared to a reference composite curve for the specific pumping system to determine whether actual performance has satisfied underperformance criteria or moved across a threshold into underperformance.

Claims

1. A method of identifying underperformance of a pumping system, comprising:

creating a reference composite curve for a parameter of the pumping system;

determining the parameter through actual measurements during operation of the pumping system;

providing a confidence factor based on the methodology of determining the parameter through actual measurements;

comparing the parameter determined through actual measurements, in conjunction with the confidence factor, to the reference composite curve for identifying underperformance of the pumping system;

calculating a pump performance index (PPI) based on a ratio of the parameter determined through actual measurements and the reference composite curve;

storing PPI values and confidence factor values taken at periodic intervals; and

automatically providing an alert when a combination of PPI values and confidence factor values satisfies underperformance criteria.

2. The method as recited in claim 1, wherein creating comprises creating the reference composite curve based on test data for an electric submersible pumping system.

3. The method as recited in claim 2, wherein the electric submersible pumping system has a plurality of pump sections.

4. The method as recited in claim 1, wherein the satisfaction of underperformance criteria comprises crossing a threshold.

5. The method as recited in claim 1, wherein determining comprises utilizing performance related data on a real time basis.

6. The method as recited in claim 1, wherein determining comprises utilizing performance related data on an episodic basis.

7. The method as recited in claim 1, wherein determining comprises utilizing performance related data on both a real time and episodic basis.

8. A method of identifying underperforming pumping systems, comprising:

comparing a measured parameter of a pumping system to a reference parameter of the pumping system;

utilizing a confidence factor to facilitate accurate determination of underperformance of the pumping system;

deriving pump performance index (PPI) values over time by determining the ratio of the measured parameter to the reference parameter versus time; and

determining a plurality of confidence factor values corresponding to the PPI values.

9. The method as recited in claim 8, further comprising storing the PPI values and the confidence factor values for use in determining when the pumping system performance satisfies underperformance criteria.

10. The method as recited in claim 9, wherein the satisfaction of underperformance criteria comprises crossing a threshold.

11. The method as recited in claim 9, further comprising alerting an operator when the pumping system performance satisfies underperformance criteria.

12. The method as recited in claim 8, further comprising determining the measured parameter based on real time data.

13. The method as recited in claim 8, further comprising determining the measured parameter based on episodic data.

14. A method of identifying underperforming pumping systems, comprising:

comparing a measured parameter of a pumping system to a reference parameter of the pumping system;

utilizing a confidence factor to facilitate accurate determination of underperformance of the pumping system; and

determining the measured parameter based on a combination of real time data and episodic data.

15. The method as recited in claim 14, wherein the reference parameter is based on actual testing of the pumping system.

16. The method as recited in claim 14, wherein comparing comprises comparing a measured lift of an electric submersible pumping system to a reference lift of the electric submersible pumping system.

17. The method as recited in claim 14, further comprising providing the reference parameter in the form of a composite tested curve for pumping system performance.

18. A method comprising:

testing each pump of a pump unit prior to use of the pump unit in a submersible pumping system to determine a reference parameter for each pump, the testing comprising determining lift data for each pump of the pump unit; and

creating a composite reference parameter based on combining reference parameters determined for each pump, wherein creating comprises summing the lift data from each pump of the pump unit to determine the composite reference parameter.

19. The method as recited in claim 18, wherein testing further comprises determining flow rate for each pump of the pump unit.

20. The method as recited in claim 19, further comprising averaging the flow rates from each pump of the pump unit to determine another composite reference parameter.

21. The method as recited in claim 18, wherein testing further comprises determining power for each pump of the pump unit.

22. The method as recited in claim 21, further comprising summing the power from each pump of the pump unit to determine another composite reference parameter.

23. The method as recited in claim 18, further comprising determining measured parameters during actual use of the pumping system for comparison to the composite reference parameter over time.

24. The method as recited in claim 23, further comprising providing a confidence factor based on the methodology used to determine measured parameters.