Automating well construction operations based on detected abnormal events

1. A method comprising:

commencing operation of an equipment controller of a control system for monitoring and controlling a well construction system, wherein the well construction system comprises well construction equipment operable to perform well construction operations, and wherein commencing operation of the equipment controller causes the equipment controller to:

receive sensor data from a downhole rotational speed sensor of a drill string that comprises a mud-motor operatively coupled to a bit, wherein the downhole rotational speed sensor acquires magnetic and/or gyroscopic measurements;

detect an abnormal downhole event based on the sensor data, wherein the abnormal downhole event is a stick-slip event or a bit stalling event, and wherein the sensor data indicate reverse rotation of the mud-motor as associated with a risk of mud-motor twist-off;

responsive to detection of the abnormal downhole event, automatically access a database to automatically select an operational sequence to be performed by the well construction equipment based on the abnormal downhole event, wherein the database comprises operational sequences for different types of events; and

output control data to cause the well construction equipment to perform the operational sequence, wherein the operational sequence calls for a drawworks of the well construction equipment to reduce weight on the bit to thereby stop the reverse rotation of the mud motor and mitigate the risk of the mud-motor twist-off.

2. The method of claim 1 wherein commencing operation of the equipment controller further causes the equipment controller to:

receive a well construction plan;

before detecting the abnormal downhole event:

select a planned operational sequence to be performed by the well construction equipment based on the well construction plan; and

output first control data to cause the well construction equipment to perform the planned operational sequence; and

after detecting the abnormal downhole event, output second control data to cause the well construction equipment to stop performing the planned operational sequence.

3. The method of claim 1 wherein commencing operation of the equipment controller causes the equipment controller to detect one or more additional abnormal downhole events.

4. The method of claim 3 , wherein the one or more additional abnormal downhole events comprises an abnormal condition of a downhole fluid.

5. The method of claim 4 , wherein the abnormal condition of the downhole fluid comprises one or more of swab, surge, gains of wellbore fluid, and losses of wellbore fluid.

6. The method of claim 1 , wherein the operational sequence additionally calls for stopping of pumping of drilling fluid.

7. A system comprising:

an equipment controller for monitoring and controlling a well construction system, wherein the well construction system comprises well construction equipment operable to perform well construction operations, and wherein the equipment controller comprises one or more processors, memory accessibly to at least one of the one or more processors, and processor-executable instructions stored in the memory that are executable to cause the equipment controller to:

receive sensor data from a downhole rotational speed sensor of a drill string that comprises a mud-motor operatively coupled to a bit, wherein the downhole rotational speed sensor acquires magnetic and/or gyroscopic measurements;

detect an abnormal downhole event based on the sensor data, wherein the abnormal downhole event is a stick-slip event or a bit stalling event, and wherein the sensor data indicate reverse rotation of the mud-motor as associated with a risk of mud-motor twist-off;

responsive to detection of the abnormal downhole event, automatically access a database to automatically select an operational sequence to be performed by the well construction equipment based on the abnormal downhole event, wherein the database comprises operational sequences for different types of events; and

output control data to cause the well construction equipment to perform the operational sequence, wherein the operational sequence calls for a drawworks of the well construction equipment to reduce weight on the bit to thereby stop the reverse rotation of the mud motor and mitigate the risk of the mud-motor twist-off.

8. The system of claim 7 wherein the processor-executable instructions stored in the memory are executable to cause the equipment controller to:

receive a well construction plan;

before detection of the abnormal downhole event:

select a planned operational sequence to be performed by the well construction equipment based on the well construction plan; and

output first control data to cause the well construction equipment to perform the planned operational sequence; and

after detection of the abnormal downhole event, output second control data to cause the well construction equipment to stop performing the planned operational sequence.

9. The system of claim 7 wherein the processor-executable instructions stored in the memory are executable to cause the equipment controller to detect one or more additional abnormal downhole events.

10. The system of claim 9 , wherein the one or more additional abnormal downhole events comprises an abnormal condition of a downhole fluid.

11. The system of claim 10 , wherein the abnormal condition of the downhole fluid comprises one or more of swab, surge, gains of wellbore fluid, and losses of wellbore fluid.

12. The system of claim 7 , wherein the operational sequence additionally calls for stopping of pumping of drilling fluid.

13. One or more non-transitory computer-readable storage media comprising processor-executable instructions to instruct an equipment controller of a control system to:

commence operation of the equipment controller of the control system for monitoring and controlling a well construction system, wherein the well construction system comprises well construction equipment operable to perform well construction operations;

receive sensor data from a downhole rotational speed sensor of a drill string that comprises a mud-motor operatively coupled to a bit, wherein the downhole rotational speed sensor acquires magnetic and/or gyroscopic measurements;

detect an abnormal downhole event based on the sensor data, wherein the abnormal downhole event is a stick-slip event or a bit stalling event, and wherein the sensor data indicate reverse rotation of the mud-motor as associated with a risk of mud-motor twist-off;

responsive to detection of the abnormal downhole event, automatically access a database to automatically select an operational sequence to be performed by the well construction equipment based on the abnormal downhole event, wherein the database comprises operational sequences for different types of events; and

output control data to cause the well construction equipment to perform the operational sequence, wherein the operational sequence calls for a drawworks of the well construction equipment to reduce weight on the bit to thereby stop the reverse rotation of the mud motor and mitigate the risk of the mud-motor twist-off.

14. The one or more non-transitory computer-readable media of claim 13 , wherein the processor-executable instructions comprise processor-executable instructions to instruct the equipment controller of the control system to:

receive a well construction plan;

before detection of the abnormal downhole event:

select a planned operational sequence to be performed by the well construction equipment based on the well construction plan; and

output first control data to cause the well construction equipment to perform the planned operational sequence; and

after detection of the abnormal downhole event, output second control data to cause the well construction equipment to stop performing the planned operational sequence.

15. The one or more non-transitory computer-readable media of claim 13 , wherein the processor-executable instructions comprise processor-executable instructions to instruct the equipment controller of the control system to:

cause the equipment controller to detect one or more additional abnormal downhole events.

16. The one or more non-transitory computer-readable media of claim 15 , wherein the one or more additional abnormal downhole events comprises an abnormal condition of a downhole fluid.

17. The one or more non-transitory computer-readable media of claim 16 , wherein the abnormal condition of the downhole fluid comprises one or more of swab, surge, gains of wellbore fluid, and losses of wellbore fluid.

18. The one or more non-transitory computer-readable media of claim 13 , wherein the operational sequence additionally calls for stopping of pumping of drilling fluid.