Methods of correcting accelerometer and magnetometer measurements
US8473211B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 9, 2008 |
| Grant date | Jun 25, 2013 |
| Priority date | — |
| Expiry date | Jul 28, 2029 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/024
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.