Patent ID: 11898432
Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 8:
9. A method for drilling a subterranean wellbore, the method comprising:
(a) rotating a drill string in the subterranean wellbore to drill, the drill string including a drill collar, a drill bit, a roll-stabilized housing deployed in the drill collar, and a triaxial accelerometer set and a triaxial magnetometer set deployed in the roll-stabilized housing;
(b) causing the triaxial accelerometer set and the triaxial magnetometer set to make corresponding triaxial accelerometer measurements and triaxial magnetometer measurements while the drill string is rotating in (a);
(c) processing the triaxial accelerometer measurements and the triaxial magnetometer measurements made in (b) to compute survey parameters of the subterranean wellbore while drilling in (a), the survey parameters including at least a wellbore azimuth;
(d) processing the triaxial magnetometer measurements made in (b) to compute an eddy current induced wellbore azimuth error; and
(e) removing the eddy current induced azimuth error computed in (d) from the wellbore azimuth computed in (c) to obtain a corrected wellbore azimuth.