Safe drill floor access

1. An apparatus comprising:

a system for maintaining safety of a human worker in a restricted area of a drill floor during drilling operations performed at least partially by equipment located in the restricted area, wherein the system comprises:

a plurality of presence detection sensors each disposed on the drill floor and operable to output a presence detection signal indicative of detection of the human worker entering the restricted area;

an entry input device disposed on the drill floor and operable to output an entry request signal when manually operated by the human worker intending to enter the restricted area;

a manually operated presence confirmation sensor disposed in the restricted area; and

a processing device comprising a processor and a memory storing computer program code, wherein the processing device is communicatively connected with the equipment, the presence detection sensors, and the entry input device, and wherein the processing device is operable to:

receive the presence detection signal;

output a first stop control command to the equipment to cause the equipment to stop operating in response to the received presence detection signal;

receive the entry request signal;

output an entry request indicator via an output device to a human driller within a drill rig control center in response to the received entry request signal;

receive an entry grant input from the human driller granting entry to the human worker to enter the restricted area;

output a second stop control command to the equipment located in the restricted area to cause the equipment to stop operating in response to the received entry grant input; and

responsive to continuous actuation of the manually operated presence confirmation sensor in the restricted area by the human worker, allow for operation of at least one piece of the equipment.

2. The apparatus of claim 1 wherein the system further comprises an exit input device disposed on the drill floor and operable to output an exit confirmation signal when manually operated by the human worker exiting the restricted area, wherein the processing device is communicatively connected with the exit input device, and wherein the processing device is further operable to:

receive the exit confirmation signal; and

output a start control command to the equipment located in the restricted area to cause the equipment to start operating in response to the received exit confirmation signal.

3. The apparatus of claim 1 wherein the system further comprises the manually operated presence confirmation sensor disposed in the restricted area at a location away from a movement path of the equipment, and wherein the processing device is further operable to:

receive a presence confirmation signal responsive to actuation of the manually operated presence confirmation sensor;

output limited operation control commands to the equipment located in the restricted area to cause the equipment to start operating in a limited manner while the presence confirmation signal is being received; and

output a third stop control command to the equipment to cause the equipment to stop operating when the presence confirmation signal is no longer being received.

4. The apparatus of claim 1 wherein the processing device is further operable to output a third stop control command to the equipment located in the restricted area to cause the equipment to stop operating in response to the received entry request signal.

5. The apparatus of claim 1 wherein the first stop control command causes the equipment to stop operating immediately, and wherein the second stop control command causes the equipment to ramp-down operations before the equipment stops operating.

6. The apparatus of claim 1 wherein the equipment is or comprises at least one of:

drill string slips;

a drawworks;

an iron roughneck;

a catwalk;

a top drive;

a tubular delivery arm; and

a lower stabilization arm.

7. The apparatus of claim 1 wherein at least one of the presence detection sensors is or comprises a rope pull switch.

8. The apparatus of claim 1 wherein the entry request indicator is or comprises a: visual indicator output via at least one of a light emitting device and a video output device; and/or

an audio indicator output via an audio speaker.

9. The apparatus of claim 1 wherein:

the system further comprises:

a plurality of red lights disposed on the drill floor; and

a plurality of yellow lights disposed on the drill floor;

the processing device is communicatively connected with the red lights and the yellow lights; and

the processing device is further operable to:

cause the red lights to light up when the equipment is operating; and

cause the yellow lights to light up in response to receiving at least one of the presence detection signal and the received entry grant input.

10. An apparatus comprising:

a system for maintaining safety of a human worker in a restricted area of a drill floor during drilling operations performed at least partially by equipment located in the restricted area, wherein the system comprises:

a manually operated presence confirmation sensor disposed in the restricted area away from a movement path of the equipment and operable to output a presence confirmation signal when manually operated by the human worker in the restricted area; and

a processing device comprising a processor and a memory storing computer program code, wherein the processing device is communicatively connected with the equipment and the manually operated presence confirmation sensor, and wherein the processing device is operable to:

receive the presence confirmation signal; and

output limited operation control commands to the equipment located in the restricted area to cause the equipment to start operating in a limited manner in response to the received presence confirmation signal.

11. The apparatus of claim 10 wherein the limited operation control commands cause a predetermined one or more instances, but not each instance, of the equipment to operate.

12. The apparatus of claim 10 wherein the limited operation control commands cause a predetermined one or more instances of the equipment to operate at a reduced speed of operation.

13. The apparatus of claim 10 wherein the processing device is further operable to:

output the limited operation control commands to the equipment while the presence confirmation signal is being received; and

output a stop control command to the equipment to cause the equipment to stop operating when the presence confirmation signal is no longer being received.

14. The apparatus of claim 10 wherein the manually operated presence confirmation sensor is or comprises at least one of a foot pedal and a push button.

15. The apparatus of claim 10 wherein the system further comprises an entry input device disposed on the drill floor and operable to output an entry request signal when manually operated by the human worker intending to enter the restricted area, wherein the processing device is communicatively connected with the entry input device, and wherein the processing device is further operable to:

receive the entry request signal;

output an entry request indicator via an output device to a human driller within a drill rig control center in response to the received entry request signal;

receive an entry grant input from the human driller granting entry to the human worker to enter the restricted area; and

output a stop control command to the equipment located in the restricted area to cause the equipment to stop operating in response to the received entry grant input.

16. The apparatus of claim 10 wherein the system further comprises a plurality of presence detection sensors each disposed on the drill floor and operable to output a presence detection signal indicative of detection of the human worker entering the restricted area, wherein the processing device is communicatively connected with the presence detection sensors, and wherein the processing device is further operable to:

receive the presence detection signal; and

output a stop control command to the equipment to cause the equipment to stop operating in response to the received presence detection signal.

17. The apparatus of claim 10 wherein the system further comprises an exit input device disposed on the drill floor and operable to output an exit confirmation signal when manually operated by the human worker exiting the restricted area, wherein the processing device is communicatively connected with the exit input device, and wherein the processing device is further operable to:

receive the exit confirmation signal; and

output a start control command to the equipment located in the restricted area to cause the equipment to start operating in response to the received exit confirmation signal.

18. A method comprising:

commencing operation of a processing device to operate a system for maintaining safety of a human worker in a restricted area of a drill floor during drilling operations performed at least partially by equipment located in the restricted area wherein the system comprises a manually operated presence confirmation sensor disposed in the restricted area, and wherein the processing device:

receives a presence detection signal indicative of detection of the human worker entering the restricted area;

outputs a first stop control command to the equipment to cause the equipment to stop operating in response to the received presence detection signal;

receives an entry request signal indicative of intent of the human worker to enter the restricted area;

outputs an entry request indicator via an output device to a human driller within a drill rig control center in response to the received entry request signal;

receives an entry grant input from the human driller granting entry to the human worker to enter the restricted area;

outputs a second stop control command to the equipment located in the restricted area to cause the equipment to stop operating in response to the received entry grant input; and

responsive to continuous actuation of the manually operated presence confirmation sensor in the restricted area by the human worker, allows for operation of at least one piece of the equipment.

19. The method of claim 18 wherein the processing device further:

receives an exit confirmation signal from an exit input device upon being manually operated by the human worker exiting the restricted area; and

outputs a start control command to the equipment located in the restricted area to cause the equipment to start operating in response to the received exit confirmation signal.

20. The method of claim 18 wherein the processing device further:

receives a presence confirmation signal from the manually operated presence confirmation sensor disposed in the restricted area away from a movement path of the equipment upon being manually operated by the human worker in the restricted area;

outputs limited operation control commands to the equipment located in the restricted area to cause the equipment to start operating in a limited manner while the presence confirmation signal is being received; and

outputs a third stop control command to the equipment to cause the equipment to stop operating when the presence confirmation signal is no longer being received.