US 12,338,727 B2
Systems and methods for azimuth determination while drilling
Makito Katayama, Clamart (FR)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Appl. No. 18/690,973
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed Jan. 4, 2023, PCT No. PCT/US2023/060075
§ 371(c)(1), (2) Date Mar. 11, 2024,
PCT Pub. No. WO2023/133395, PCT Pub. Date Jul. 13, 2023.
Claims priority of provisional application 63/266,388, filed on Jan. 4, 2022.
Prior Publication US 2024/0392680 A1, Nov. 28, 2024
Int. Cl. E21B 47/01 (2012.01); E21B 47/024 (2006.01)
CPC E21B 47/01 (2013.01) [E21B 47/024 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for performing a downhole survey, comprising:
rotating a downhole tool;
stabilizing a survey package relative to the rotating downhole tool;
receiving gyroscopic measurements from the survey package, wherein the gyroscopic measurements include x-axis gyroscopic measurements, y-axis gyroscopic measurements, and z-axis gyroscopic measurements;
receiving accelerometer measurements from the survey package;
while rotating the downhole tool, determining a y-axis earth rate rotational component in a direction corresponding to a y-axis of the downhole tool from the y-axis gyroscopic measurements, the z-axis gyroscopic measurements, and a toolface angle of the downhole tool;
while rotating the downhole tool, determining an x-axis earth rate rotational component in a direction corresponding to an x-axis of the downhole tool from the x-axis gyroscopic measurements and the toolface angle of the downhole tool;
based on the y-axis earth rate rotational component and the x-axis earth rate rotational component, determining a tool azimuth of the downhole tool while the downhole tool is rotating; and
adjusting a trajectory of the downhole tool using the tool azimuth.