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

Claim 0:
1. 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, a triaxial magnetometer set, and at least one gyroscopic sensor deployed in the roll-stabilized housing;
(b) causing the triaxial accelerometer set, the triaxial magnetometer set, and the gyroscopic sensor to make corresponding triaxial accelerometer measurements, triaxial magnetometer measurements, and gyroscopic sensor measurements while the drill string is rotating in (a);
(c) combining the triaxial accelerometer measurements and the gyroscopic sensor measurements made in (b) to obtain accelerometer measurements wherein the combining in (c) comprises:
(i) low pass filtering the triaxial accelerometer measurements to obtain filtered accelerometer measurements;
(ii) high pass filtering the gyroscopic sensor measurements to obtain filtered gyroscopic sensor measurements; and
(iii) combining the filtered accelerometer measurements and the filtered gyroscopic sensor measurements to obtain accelerometer measurements; and
(d) processing the accelerometer measurements obtained in (c) 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.