Method and apparatus for directly controlling pressure and position associated with an adjustable choke apparatus

• US 6,920,942 B2
• Filed: 01/29/2003
• Issued: 07/26/2005
• Est. Priority Date: 01/29/2003
• Status: Expired due to Term

• Current Assignee: Varco I/P Incorporated (NOV, Inc.)
• Original Assignee: Varco I/P Incorporated (NOV, Inc.)
• Inventors: Koederitz, William L.
• Primary Examiner(s): Neuder, William
• Application Number:
  US10/353,650
• Publication Number:
  US 20040144565A1
• Time in Patent Office: 909 Days
• Field of Search: 175/24, 175/25, 175/38, 175/90, 175/48
• US Class Current: 175/25
• 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

Abstract

A hybrid choke control system wherein the traditional choke experience is manifest in auditory and visual feedback mechanisms which are emulated by a digital control system enabling direct control of either position or back pressure associated with an adjustable choke device. The present invention enhances safety and efficiency when used in association with oil field drilling operations and in particular when applied to a device which provides the user with enhanced control capabilities for direction controlling the back pressure and position associated with drilling chokes during down hole operations.

Claims

1. A method for controlling a choke for controlling the back pressure for fluid flowing in an oil rig comprising:

receiving a choke control command from an operator console;

providing a control command to a choke device;

providing physical feed back to an operator indicating that the choke command has been executed; and

receiving command input from a joystick.

2. The method of claim 1, further comprising:

receiving a choke element command from an operator console;

providing a choke element position command to the choke device; and

providing physical feed back to the operator indicating that the choke position has changed.

3. The method of claim 2 further comprising:

receiving a restricted relative position choke element control command; and

calculating the movement of the choke element based on the restricted relative position control command and a current position of the choke element so that the choke element position does not race ahead of its current position to a position far from its current location.

4. The method of claim 3, further comprising:

receiving a choke element direction command.

5. The method of claim 1 further comprising:

receiving a choke pressure control command;

sensing a current pressure of the choke device; and

calculating the movement of the choke element based on the choke pressure control command and the current pressure of the choke element so that the choke element does not race ahead of its current pressure to a pressure far from its current pressure.

6. The method of claim 5, further comprising:

providing physical feedback to an operator indicating that choke pressure command has been executed.

7. A method for controlling a choke for controlling the back pressure for fluid flowing in an oil rig comprising:

receiving a choke control command from an operator console;

providing a control command to a choke device;

providing physical feed back to an operator indicating that the choke command has been executed;

receiving a choke element command from an operator console;

providing a choke element position command to the choke device;

providing physical feed back to the operator indicating that the choke position has changed;

receiving a restricted relative position choke element control command; and

calculating the movement of the choke element based on the restricted relative position control command and a current position of the choke element so that the choke element position does not race ahead of its current position to a position far from its current location.

8. An apparatus for controlling a choke element associated with an oil rig comprising

a choke element adapted for movement in a choke housing to control the flow of fluid from an inlet passage to an outlet passage, the fluid applying a force on one end of the choke element;

an operator console for providing a choke control command;

a receiver for receiving the choke control signal from the operator console;

an operator console device for providing physical feed back to an operator indicating that the choke command has been executed;

a receiver for receiving a position choke element control command;

a sensor for sensing the current position of the choke element;

and a processor for calculating the movement of the choke element based on the choke control command and the position of the choke element so that the choke element does not race ahead of its current position to a position far from its current location.

9. The apparatus of claim 8, further comprising:

a sensor for sensing a position of the choke element in the choke device.

10. The apparatus of claim 8 further comprising:

a receiver for receiving choke pressure control command;

a sensor for sensing the current pressure of the choke device; and

a processor for calculating the movement of the choke element based on the choke pressure control command and the current pressure of the choke element so that the choke element does not race ahead of its current pressure to a pressure far from its current pressure.

11. The apparatus of claim 8, further comprising:

a joystick for providing commands input to the choke controller.

12. An apparatus for controlling a choke element associated with an oil rig comprising:

a choke element adapted for movement in a choke housing to control the flow of fluid from an inlet passage to an outlet passage, the fluid applying a force on one end of the choke element;

an operator console for providing a choke control command;

a receiver for receiving the choke control signal from the operator console;

an operator console device for providing physical feed back to an operator indicating that the choke command has been executed;

a receiver for receiving choke pressure control command;

a sensor for sensing the current pressure of the choke device; and

a processor for calculating the movement of the choke element based on the choke pressure control command and the current pressure of the choke element so that the choke element does not race ahead of its current pressure to a pressure far from its current pressure.

13. An apparatus for controlling a choke element associated with an oil rig comprising:

a choke element adapted for movement in a choke housing to control the flow of fluid from an inlet passage to an outlet passage, the fluid applying a force on one end of the choke element;

an operator console for providing a choke control command;

a receiver for receiving the choke control signal from the operator console;

an operator console device for providing physical feed back to an operator indicating that the choke command has been executed; and

a joystick for providing commands input to the choke controller.

14. A computer readable medium containing computer executable instruction for performing a method for controlling a choke for controlling the back pressure for fluid flowing in an oil rig comprising:

receiving a choke control command from an operator console;

providing a control command to a choke device;

providing physical feed back to an operator indicating that the choke command has been executed;

receiving a choke element command from an operator console;

providing a choke element position command to the choke device;

providing physical feed back to the operator indicating that the choke position has changed;

receiving a restricted relative position choke element control command; and

calculating the movement of the choke element based on the restricted relative position control command and a current position of the choke element so that the choke element position does not race ahead of its current position to a position far from its current location.

15. The medium of claim 14, further comprising:

receiving a choke element direction command.

16. The medium of claim 14 further comprising:

receiving a choke pressure control command;

sensing a current pressure of the choke device; and

calculating the movement of the choke element based on the choke pressure control command and the current pressure of the choke element so that the choke element does not race ahead of its current pressure to a pressure far from its current pressure.

17. The medium of claim 16, further comprising:

providing physical feedback to an operator indicating that choke pressure command has been executed.

18. The medium of claim 14 further comprising:

receiving command input from a joystick.

19. A computer readable medium containing computer executable instruction for performing a method for controlling a choke for controlling the back pressure for fluid flowing in an oil rig comprising:

receiving a choke control command from an operator console;

providing a control command to a choke device;

providing physical feed back to an operator indicating that the choke command has been executed;

receiving a choke pressure control command;

sensing a current pressure of the choke device; and

calculating the movement of the choke element based on the choke pressure control command and the current pressure of the choke element so that the choke element does not race ahead of its current pressure to a pressure far from its current pressure.

20. A computer readable medium containing computer executable instruction for performing a method for controlling a choke for controlling the back pressure for fluid flowing in an oil rig comprising:

receiving a choke control command from an operator console;

providing a control command to a choke device;

providing physical feed back to an operator indicating that the choke command has been executed; and

receiving command input from a joystick.