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US 2026/0092518 A1Published application
Adaptive parameter estimation for static and dynamic wellbore surveys
AssigneeSchlumberger Technology Corporation
InventorsSofya Sizova, Arnaud Jarrot, Arnaud Croux, Makito Katayama
Life of this patent
Estimating the term…
Abstract
Survey measurement compensation terms are determined for dynamic wellbore surveys. The compensation terms may be applied to either static or the dynamic surveys to obtain compensated survey measurements.
Claims20
A wellbore surveying method comprising:
- making dynamic surveying measurements while rotating a drill string in a wellbore;
- making static surveying measurements when drilling has temporarily stopped and the drill string has been pulled off of a bottom of the wellbore;
- comparing the dynamic surveying measurements and the static surveying measurements to compute at least one dynamic surveying compensation term;
- applying the dynamic surveying compensation term to subsequent dynamic surveying measurements to obtain compensated dynamic surveying measurements;
- and
- computing at least one survey parameter from the compensated dynamic surveying measurements.
3 more elements
A wellbore surveying method comprising:
- making dynamic surveying measurements while rotating a drill string in a wellbore to drill, the dynamic surveying measurements including at least cross-axial magnetometer measurements;
- fitting the cross-axial magnetometer measurements with a second-degree polynomial equation of an ellipse;
- evaluating the fit to determine a cross-axial magnetometer measurement compensation;
- and
- applying the cross-axial magnetometer measurement compensation to the cross-axial magnetometer measurements to compute a compensated transverse magnetic field measurement or compensated cross-axial magnetometer measurements.
2 more elements
A downhole tool comprising
- a downhole tool body configured to rotate in a wellbore;
- a triaxial accelerometer set and a triaxial magnetometer set deployed in the tool body;
- and
- a processor deployed in the tool body, the processor configured to cause the triaxial accelerometer set and a triaxial magnetometer set to make corresponding triaxial accelerometer and triaxial magnetometer measurements while the downhole tool body rotates in the wellbore, fit cross-axial ones of the triaxial magnetometer measurements with a second-degree polynomial equation of an ellipse, evaluate the fit to determine a cross-axial magnetometer measurement compensation, and apply the cross-axial magnetometer measurement compensation to the cross-axial magnetometer measurements to compute a compensated transverse magnetic field measurement or compensated cross-axial magnetometer measurements.
1 more element
Dependencies are inferred from the claim text.