Autonomous drilling pressure control system

1. An autonomous drilling pressure control system for use with a drilling rig, comprising:

a pressure control device for controlling pressure within an annulus of an associated well;

an electronic pressure sensor for monitoring pressure within the annulus;

an electronic position indicator for indicating a position of the pressure control device;

a control subsystem independent of the drilling rig and responsive to the pressure sensor for manipulating the pressure control device to control the pressure within the annulus of the associated well; and

at least one dedicated power source independent of the drilling rig for supplying power to the pressure sensor and position indicator; and

a remote control module disposed remotely from the control subsystem and including a processor and first wireless gateway;

wherein the pressure control device comprises a pressure control valve;

wherein the control subsystem comprises:

an actuator for operating the pressure control valve; and

an electro-pneumatic positioner for controlling air supplied to the actuator for operation of the pressure control valve; and

wherein the dedicated power source comprises:

an electrical power supply that is independent of the drilling rig for supplying electrical power to the electro-pneumatic positioner;

a pneumatic power supply that is independent of the drilling rig for supplying air to the electro-pneumatic positioner; and

wherein the electrical power supply and the pneumatic power supply are powered by a common electrical battery that is independent of the drilling rig; and

wherein the dedicated power source provides no control signals to the control subsystem for operation of the pressure control valve; and

wherein the remote control module is adapted to receive, using the first wireless gateway, pressure data from a second wireless gateway operably connected to the electronic pressure sensor.

2. The autonomous drilling pressure control system of claim 1 , wherein the position indicator includes an output to a display unit and a second display unit for displaying data from the electronic pressure sensor and the control subsystem is adapted for manual manipulation of the pressure control device.

3. The autonomous drilling pressure control system of claim 1 , wherein the control subsystem is responsive to a set point pressure.

4. The autonomous drilling pressure control system of claim 1 , wherein the dedicated power source comprises a dedicated electric power source including at least one of a solar panel, a wind generator, and a battery assembly.

5. The autonomous drilling pressure control system of claim 1 , wherein the dedicated power source comprises a dedicated electric power source including an uninterruptible power supply module.

6. The autonomous drilling pressure control system of claim 1 , wherein the pressure sensor and the control subsystem communicate via a wireless link.

7. The autonomous drilling pressure control system of claim 1 , wherein the control subsystem further comprises at least one of a process logic controller and central processing unit for executing algorithms for controlling an actuator with a positioner.

8. The autonomous drilling pressure control system of claim 7 , wherein the pressure sensor, the control subsystem, and the at least one of a process logic controller and central processing unit communicate via wireless links.

9. The autonomous drilling pressure control system of claim 1 , further comprising at least one of a flowmeter and a massmeter.

10. The autonomous drilling pressure control system of claim 9 , wherein the flowmeter comprises a differential pressure type flowmeter utilizing a restriction device.

11. The autonomous drilling pressure control system of claim 10 , further comprising a densitometer upstream of the flowmeter.

12. The autonomous drilling pressure control system of claim 11 , wherein the densitometer comprises a vibrating tube type densitometer.

13. The autonomous drilling pressure control system of claim 9 , wherein the massmeter comprises a Coriolis-type mass measurement device.

14. The autonomous drilling pressure control system of claim 1 , wherein the pressure control device comprises a pressure control valve and a differential pressure flow measurement device in one unit.

15. The autonomous drilling pressure control system of claim 14 , wherein the control subsystem further comprises a local process logic controller for calculating a flowrate continuously.

16. The autonomous drilling pressure control system of claim 1 , wherein the control subsystem further comprises a local process logic controller that incorporates a control loop feedback mechanism.

17. The autonomous drilling pressure control system of claim 16 , wherein the control subsystem can continue to function independently of external control commands or signals.

18. An autonomous drilling pressure control system for use with a drilling rig, comprising:

a pressure control device for controlling pressure within an annulus of an associated well;

an electronic pressure sensor for monitoring pressure within the annulus;

an electronic position indicator for indicating a position of the pressure control device;

a control subsystem independent of the drilling rig and responsive to the pressure sensor for manipulating the pressure control device to control the pressure within the annulus of the associated well; and

at least one dedicated power source independent of the drilling rig for supplying power to the pressure sensor and position indicator; and

wherein the pressure control device is an eccentric rotary plug valve operated with an electro-pneumatic valve positioner and the control subsystem provides power generated by the dedicated power source to an eccentric rotary plug valve actuator.