The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 25, 2013
Filed:
Apr. 09, 2008
Philip Cheung, Montesson, FR;
Philip Cheung, Montesson, FR;
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
A method of correcting accelerometer and magnetometer measurements made in a well is provided. The method includes making a series of triaxial measurements with magnetometers and accelerometers in an interval of the well to derive measured values of gravitational acceleration g, magnetic filed intensity B, and the sine of the magnetic inclination sin I. The method also includes obtaining known values of g, B and sin I for the interval and determining values of a correction to be applied to the measured values by simultaneously minimizing the difference between the measured values and the known values of g, B and sin I for the interval. The method also includes applying the correction to the measured values to obtain in situ corrected values for g, B and sin I.