Oil rig choke control systems and methods

• US 20050222772A1
• Filed: 02/11/2005
• Published: 10/06/2005
• Est. Priority Date: 01/29/2003
• Status: Abandoned Application

• Current Assignee: Varco I/P Incorporated (NOV, Inc.)
• Original Assignee: Varco I/P Incorporated (NOV, Inc.)
• Inventors: Koederitz, William L., Guggari, Mallappa I.
• Application Number:
  US11/056,951
• Publication Number:
  US 20050222772A1
• Time in Patent Office: Days
• US Class Current: 702/6
• CPC Class Codes: E21B 21/08 Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure valve arrangements therefor E21B21/10
• CPC Class Codes: E21B 21/10 Valve arrangements in drilling-fluid circulation systems
• CPC Class Codes: E21B 21/106 Valve arrangements outside the borehole, e.g. kelly valves valves specifically for maintaining circulation of drilling fluid while connecting or disconnecting tubular joints E21B21/019
• CPC Class Codes: E21B 44/00 Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions

Abstract

A choke diagnostic system with a positioner for moving a choke mechanism of a choke, a choke isolation valve for placing the choke in standby mode, and a processor controlling the choke and, in certain aspects, the processor for commanding the positioner to move the choke mechanism while the choke is in standby mode.

Claims

1. A system for diagnosing and controlling a choke, the choke used for choking in wellbore operations associated with a wellbore in the earth, the system comprising

a positioner for moving a choke mechanism of a choke,

a choke isolation valve connected to the choke for selectively isolating the choke,

a processor for controlling the positioner and for selectively commanding the positioner to move the choke mechanism while the choke is in standby mode.

2. The system of claim 1 wherein the processor automatically commands the positioner to move the choke mechanism into standby mode.

3. The system of claim 1 wherein the system includes sensor apparatus for sensing conditions of the wellbore operations, the sensor apparatus for producing signals indicative of said conditions and for transmitting said signals to the processor, the sensor apparatus in communication with the processor, and the processor includes a computer readable medium with computer executable instructions for commanding the choke to remain in standby mode based on said conditions.

4. The system of claim 1 wherein the system includes sensor apparatus for sensing conditions of the wellbore operations, the sensor apparatus for producing signals indicative of said conditions and for transmitting said signals to the processor, the sensor apparatus in communication with the processor, and the processor includes a computer readable medium with computer executable instruction for commanding the choke to enter standby mode based on said conditions.

5. The system of claim 1 wherein the processor includes a computer readable medium with computer executable instructions for scheduling periodic operation of the choke and for then periodically operating the choke.

6. The system of claim 1, wherein the processor includes a computer readable medium with computer executable instructions for diagnosing the choke.

7. The system of claim 1 wherein the system includes sensor apparatus for sensing conditions of the wellbore operations, the sensor apparatus for producing signals indicative of said conditions and for transmitting said signals to the processor, the sensor apparatus in communication with the processor.

8. The system of claim 1 wherein the system includes sensor apparatus for sensing conditions of the wellbore operations, the sensor apparatus for producing signals indicative of said conditions and for transmitting said signals to the processor, the sensor apparatus in communication with the processor, and the processor includes a computer readable medium with computer executable instructions for commanding the choke to exit the standby mode based on user input or on said conditions.

9. The system of claim 1 further comprising

a mode sensor connected to the choke for determining when the choke is in a standby mode, the mode sensor in communication with the processor.

10. The system of claim 1 further comprising

a choke position sensor connected to the choke for determining the position of the choke mechanism, the choke position sensor in communication with the processor.

11. The system of claim 1 further comprising

a processor memory in the processor and containing diagnostic instructions for performing a choke diagnostic.

12. The system of claim 1 further comprising

the processor including a computer readable medium with computer executable instructions for producing a result based on a diagnostic performed by the system.

13. The system of claim 12 further comprising

the processor including a computer readable medium with computer executable instructions for producing an analysis for determining whether a choke failure has occurred.

14. The system of claim 12 further comprising

the processor including a computer readable medium with computer executable instructions for producing an analysis for predicting that a choke failure will occur.

15. The system of claim 1 further comprising

a pressure sensor for measuring a pressure of fluid circulating through the wellbore to produce a pressure measurement, the pressure sensor in communication with the processor,

the processor including a computer readable medium with computer executable instructions for determining if said pressure measurement relative to a pre-determined pressure threshold indicates that standby mode is appropriate.

16. The system of claim 1 further comprising

the processor including a computer readable medium with computer executable instructions for performing a choke mechanism speed diagnostic.

17. The system of claim 1 further comprising

the processor including a computer readable medium with computer executable instructions for performing a choke mechanism position diagnostic.

18. A system for diagnosing and controlling a choke, the choke used for choking in wellbore operations associated with a wellbore in the earth, the system comprising

a positioner for moving a choke mechanism of a choke,

a choke isolation valve connected to the choke for selectively isolating the choke,

a processor for controlling the positioner and for selectively commanding the positioner to move the choke mechanism, the processor for diagnosing the choke, transmitting information regarding a diagnosis to a control system, and for selectively periodically activating the choke.

19. The system of claim 18 wherein the processor

enables operation of the choke during the selective periodic actuation of the choke,

confirms acceptable status of the choke,

provides notice of potential problems with the coke, and

provides notice of existing problems with the choke.

20. A system for diagnosing and controlling a choke system, the choke system used for choking in wellbore operations associated with a wellbore in the earth, the system comprising

a plurality of chokes,

valve apparatus and associated conduit apparatus for selectively operating a first choke of the plurality of chokes, while at least one non-operational choke is maintained in standby mode,

each of the chokes of the plurality of chokes further comprising

a positioner for moving a choke mechanism of a choke,

a choke isolation valve for selectively isolating the choke, and

a processor for controlling the positioner and for selectively commanding the positioner to move the choke mechanism while the choke is in standby mode.

21. The system of claim 20 wherein the plurality of chokes comprises a first choke and a second choke either of which may be operational while the other is in standby mode.

22. A method for diagnosing and controlling a choke used in wellbore operations, the method comprising

placing a choke mechanism of a choke in a standby mode,

controlling the choke mechanism with a processor, and

the processor including a computer readable medium with computer executable instructions for producing instructions commanding the choke to operate to place the choke mechanism in the standby mode, to remain in standby mode, or to exit standby mode.

23. The method of claim 22 wherein the processor includes a computer readable medium for automatically placing the choke in standby mode and the system includes sensor apparatus for sensing conditions of the wellbore operations, the sensor apparatus for producing signals indicative of said conditions and for transmitting said signals to the processor, the sensor apparatus in communication with the processor, and the method further comprising

with the processor, and based on said conditions, automatically placing the choke in standby mode.

24. The method of claim 22 further comprising

with the processor, commanding the choke to enter standby mode.

25. The method of claim 22 further comprising

with the processor, commanding the choke to remain in standby mode.

26. The method of claim 22 further comprising

with the processor, commanding the choke to exit standby mode.

27. The method of claim 22 wherein the processor includes a computer readable medium with computer executable instructions for scheduling periodic operation of the choke and for then periodically operating the choke, the method further comprising

with the processor, periodically operating the choke.

28. The method of claim 22 wherein the system includes sensor apparatus for sensing conditions of the wellbore operations, the sensor apparatus for producing signals indicative of said conditions and for transmitting said signals to the processor, the sensor apparatus in communication with the processor, the method further comprising

with the processor, preventing the choke from operating based on said conditions.

29. The method of claim 22 wherein the choke includes a choke isolation valve and the method further comprises

determining with the processor when the choke isolation valve is in a standby mode.

30. The method of claim 22 wherein the choke includes a choke isolation valve, a choke position sensor for determining the position of the choke mechanism, the choke position sensor in communication with the processor, and the method further comprising

with the choke position sensor determining the position of the choke mechanism.

31. The method of claim 22 wherein the processor has a processor memory containing diagnostic parameters for performing a choke diagnostic, the method further comprising

with the processor, performing a choke diagnostic.

32. The method of claim 22 further comprising

producing with the processor a result based on a diagnostic performed by the system.

33. The method of claim 31 further comprising

determining with the processor whether a choke failure has occurred.

34. The method of claim 31 further comprising

predicting with the processor that a choke failure will occur.

35. The method of claim 22 wherein a pressure sensor for measuring pressure of fluid circulating through the wellbore is in communication with the processor, the method further comprising

producing a signal indicative of a measured pressure of fluid with the pressure sensor, and

determining with the processor if standby mode is appropriate in view of said measured pressure, and, if so, with the processor, entering the choke into standby mode.

36. The method of claim 22 further comprising

performing with the processor a choke mechanism speed diagnostic.

37. The method of claim 22 further comprising

performing with the processor a choke mechanism position diagnostic.

38. A method for diagnosing and controlling a choke used in wellbore operations, the method comprising

placing a choke mechanism of a choke in a standby mode,

controlling the choke mechanism with a processor, and

the processor including for commanding the choke to operate to place the choke mechanism in the standby mode, to remain in standby mode, or to exit standby mode.

39. A method for diagnosing and controlling a choke used in wellbore operations, the method comprising

placing a choke mechanism of a choke in a standby mode,

controlling the choke mechanism with a processor system, and

with the processor system selectively operating the choke and analyzing the choke'"'"'s operation.

40. The method of claim 39 further comprising

communicating results of said analyzing to a health check system, and

producing at least one health check result with the health check system.

41. A computer readable medium containing instructions that, when executed, cause a processor to control operation of a choke mechanism of a choke, the choke for choking drilling fluid flow in wellbore operations, and instructions for

controlling a positioner of a choke mechanism of a choke, the choke including a choke isolation valve for selectively placing the choke in standby mode,

controlling the choke isolation valve, and

selectively placing the choke in standby mode.