Real-time wear detection of a drill bit downhole in a wellbore

1 . A system comprising:

a processing device; and

a memory device that includes instructions executable by the processing device for causing the processing device to:

measure, during a drilling operation for drilling of a wellbore, at least one drilling operational parameter using one or more sensors positioned at a surface of an operating rig for the wellbore;

determine, during the drilling operation and based on the at least one drilling operational parameter, a specific energy of a subterranean formation and a drilling strength of a drill bit;

determine a correlation coefficient between the specific energy and the drilling strength; and

automatically adjust the drilling operation by (i) increasing at least one parameter of a drill string in response to determining that the correlation coefficient is below a predetermined threshold or (ii) decreasing the at least one parameter of the drill string in response to determining that the correlation coefficient is above the predetermined threshold, wherein the at least one parameter includes weight on bit, rotations per minute, or flow rate.

2 . The system of claim 1 , wherein the memory device further includes instructions executable by the processing device for causing the processing device to:

determine, based on the correlation coefficient, a bit condition of the drill bit;

generate a projected drilling distance for the drill bit based on the bit condition of the drill bit; and

adjust the drilling operation based on the projected drilling distance.

3 . The system of claim 1 , wherein the memory device further includes instructions executable by the processing device for causing the processing device to:

generate a bit-rock signature by determining, based on the at least one drilling operational parameter:

a torque on bit for the drill bit;

a depth of cut of the subterranean formation that is drilled by the drill bit; and

the weight on bit for the drill bit; and

determine a bit condition of the drill bit by determining that a value of at least one of the depth of cut, the torque on bit, and the weight on bit satisfy a predefined condition.

4 . The system of claim 1 , wherein the memory device further includes instructions executable by the processing device for causing the processing device to:

determine, based on the correlation coefficient, a bit cleaning condition of the drill bit; and

automatically adjust, based on the bit cleaning condition, the flow rate of a drilling fluid flowing in the wellbore, the weight on bit, or the rotations per minute (RPM) for the drilling operation.

5 . The system of claim 1 , wherein the memory device further includes instructions executable by the processing device for causing the processing device to:

determine, based on the correlation coefficient, a bit condition of the drill bit comprising at least one of a sharp condition, a workable condition, or a dull condition.

6 . The system of claim 1 , wherein the memory device further includes instructions executable by the processing device for causing the processing device to:

automatically output an alarm or halt the drilling operation in the wellbore based on the correlation coefficient.

7 . The system of claim 1 , wherein the memory device further includes instructions that are executable by the processing device for causing the processing device to:

determine the drilling strength based on a surface weight on bit and a depth of cut for the drilling operation.

8 . The system of claim 1 , wherein the memory device further includes instructions that are executable by the processing device for causing the processing device to:

determine the specific energy based on a surface torque on bit and a depth of cut for the drilling operation.

9 . The system of claim 1 , wherein the memory device further includes instructions that are executable by the processing device for causing the processing device to measure the at least one drilling operational parameter subsequent to a tag bottom event occurring for the drill bit.

10 . A method comprising:

measuring, by a processing device, at least one drilling operational parameter during a drilling operation for drilling of a wellbore using one or more sensors positioned at a surface of an operating rig for the wellbore;

determining, by the processing device and based on the at least one drilling operational parameter, a specific energy of a subterranean formation and a drilling strength of a drill bit;

determining, by the processing device, a correlation coefficient between the specific energy and the drilling strength; and

automatically adjusting, by the processing device, the drilling operation by (i) increasing at least one parameter of a drill string in response to determining that the correlation coefficient is below a predetermined threshold or (ii) decreasing the at least one parameter of the drill string in response to determining that the correlation coefficient is above the predetermined threshold, wherein the at least one parameter includes weight on bit, rotations per minute, or flow rate.

11 . The method of claim 10 , further comprising:

generating a bit-rock signature by determining, based on the at least one drilling operational parameter:

a torque on bit for the drill bit;

a depth of cut of the subterranean formation that is drilled by the drill bit; and

the weight on bit for the drill bit; and

determining a bit condition of the drill bit by determining that a value of at least one of the depth of cut, the torque on bit, and the weight on bit satisfy a predefined condition.

12 . The method of claim 10 , further comprising:

determining, based on the correlation coefficient, a bit cleaning condition of the drill bit; and

automatically adjusting, based on the bit cleaning condition, the flow rate of a drilling fluid flowing in the wellbore, the weight on bit, and the rotations per minute (RPM) for the drilling operation.

13 . The method of claim 10 , further comprising:

determining, based on the correlation coefficient, a bit condition of the drill bit comprising at least one of a sharp condition, a workable condition, or a dull condition.

14 . The method of claim 10 , further comprising:

automatically outputting an alarm or halt the drilling operation in the wellbore based on the correlation coefficient.

15 . A non-transitory computer-readable medium comprising program code that is executable by a processing device for causing the processing device to:

measure, during a drilling operation for drilling of a wellbore, at least one drilling operational parameter using one or more sensors positioned at a surface of the wellbore;

determine, based on the at least one drilling operational parameter, a specific energy of a subterranean formation and a drilling strength of a drill bit;

determine a correlation coefficient between the specific energy and the drilling strength; and

automatically adjust the drilling operation by (i) increasing at least one parameter of a drill string in response to determining that the correlation coefficient is below a predetermined threshold or (ii) decreasing the at least one parameter of the drill string in response to determining that the correlation coefficient is above the predetermined threshold, wherein the at least one parameter includes weight on bit, rotations per minute, or flow rate.

16 . The non-transitory computer-readable medium of claim 15 , wherein the program code is further executable by the processing device for causing the processing device to:

generate a bit-rock signature by determining, based on the at least one drilling operational parameter:

a torque on bit for the drill bit;

a depth of cut of the subterranean formation that is drilled by the drill bit; and

the weight on bit for the drill bit; and

determine a bit condition of the drill bit by determining that a value of at least one of the depth of cut, the torque on bit, and the weight on bit satisfy a predefined condition.

17 . The non-transitory computer-readable medium of claim 15 , wherein the program code is further executable by the processing device for causing the processing device to:

determine, based on the correlation coefficient, a bit cleaning condition of the drill bit; and

automatically adjust, based on the bit cleaning condition, the flow rate of a drilling fluid flowing in the wellbore, the rotations per minute (RPM), and the weight on bit for the drilling operation.

18 . The non-transitory computer-readable medium of claim 15 , wherein the program code is further executable by the processing device for causing the processing device to:

determine, based on the correlation coefficient, a bit condition of the drill bit, wherein the bit condition comprises at least one of a sharp condition, a workable condition, or a dull condition.

19 . The non-transitory computer-readable medium of claim 18 , wherein the program code is further executable by the processing device for causing the processing device to:

automatically output an alarm or halt the drilling operation in the wellbore based on the bit condition.

20 . The non-transitory computer-readable medium of claim 18 , wherein the program code is further executable by the processing device for causing the processing device to:

generate a projected drilling distance for the drill bit based on the bit condition of the drill bit; and

adjust the drilling operation based on the projected drilling distance.