Identification of residual gravitational signal from drilling tool sensor data
In some aspects, the disclosed technology provides solutions for computing a residual noise signal from received gravitational field signal data. In one aspect, a process of the disclosed technology includes steps for receiving a magnetic field signal, wherein the magnetic field signal is generated by measurements produced by a magnetometer disposed in a drilling tool chassis, receiving a gravitational field signal, and processing the magnetic field signal to generate a clean magnetic field signal. In some aspects, the process can further include steps for calculating a residual signal based on the clean magnetic field signal and the gravitational field signal. Systems and machine-readable media are also provided.
1. A computer-implemented method comprising:
receiving a first orientation signal, wherein the first orientation signal comprises a magnetic field signal generated from measurements produced by a magnetometer disposed in a drilling tool chassis;
receiving a second orientation signal;
processing the magnetic field signal to generate a clean magnetic field signal; and
calculating a residual signal based on the clean magnetic field signal and the second orientation signal.
2. The computer-implemented method of claim 1 , wherein the second orientation signal comprises a gravitational field signal generated from measurements produced by one or more accelerometers in the drilling tool chassis.
3. The computer-implemented method of claim 1 , wherein the second orientation signal is generated using one or more gyroscopic sensors.
4. The computer-implemented method of claim 1 , wherein the magnetic field signal indicates an orientation of the drilling tool.
5. The computer-implemented method of claim 1 , wherein a direction of maximum sensitivity indicated by the first orientation signal and a direction of maximum sensitivity indicated by the second orientation signal differ by a substantially constant offset.
6. The computer-implemented method of claim 1 , wherein processing the magnetic field signal to generate the clean magnetic field signal further comprises:
processing an x-component of the magnetic field signal to generate a clean x-component signal; and
processing a y-component of the magnetic field signal to generate a clean y-component signal.
7. The computer-implemented method of claim 1 , further comprising:
identifying one or more harmonics in the residual signal.
8. A system comprising:
one or more processors; and
a non-transitory computer-readable medium comprising instructions stored therein, which when executed by the processors, cause the processors to perform operations comprising:
receiving a first orientation signal, wherein the first orientation signal comprises a magnetic field signal generated from measurements produced by a magnetometer disposed in a drilling tool chassis;
receiving a second orientation signal;
processing the magnetic field signal to generate a clean magnetic field signal; and
calculating a residual signal based on the clean magnetic field signal and the second orientation signal.
9. The system of claim 8 , wherein the second orientation signal comprises a gravitational field signal generated from measurements produced by one or more accelerometers in the drilling tool chassis.
10. The system of claim 8 , wherein the second orientation signal is generated using one or more gyroscopic sensors.
11. The system of claim 8 , wherein the magnetic field signal indicates an orientation of the drilling tool.
12. The system of claim 8 , wherein a direction of maximum sensitivity indicated by the first orientation signal and a direction of maximum sensitivity indicated by the second orientation signal differ by a substantially constant offset.
13. The system of claim 8 , wherein processing the magnetic field signal to generate the clean magnetic field signal further comprises:
processing an x-component of the magnetic field signal to generate a clean x-component signal; and
processing a y-component of the magnetic field signal to generate a clean y-component signal.
14. The system of claim 8 , wherein the processors are further configured to perform operations comprising:
identifying one or more harmonics in the residual signal.
15. A non-transitory computer-readable storage medium comprising instructions stored therein, which when executed by one or more processors, cause the processors to perform operations comprising:
receiving a first orientation signal, wherein the first orientation signal comprises a magnetic field signal generated from measurements produced by a magnetometer disposed in a drilling tool chassis;
receiving a second orientation signal;
processing the magnetic field signal to generate a clean magnetic field signal; and
calculating a residual signal based on the clean magnetic field signal and the second orientation signal.
16. The non-transitory computer-readable storage medium of claim 15 , wherein the second orientation signal comprises a gravitational field signal generated from measurements produced by one or more accelerometers in the drilling tool chassis.
17. The non-transitory computer-readable storage medium of claim 15 , wherein the second orientation signal is generated using one or more gyroscopic sensors.
18. The non-transitory computer-readable storage medium of claim 15 , wherein the magnetic field signal indicates an orientation of the drilling tool.
19. The non-transitory computer-readable storage medium of claim 15 , wherein a direction of maximum sensitivity indicated by the first orientation signal and a direction of maximum sensitivity indicated by the second orientation signal differ by a substantially constant offset.
20. The non-transitory computer-readable storage medium of claim 15 , wherein processing the magnetic field signal to generate the clean magnetic field signal further comprises:
processing an x-component of the magnetic field signal to generate a clean x-component signal; and
processing a y-component of the magnetic field signal to generate a clean y-component signal.