Method of correcting wellbore magnetometer errors

Details Method of correcting wellbore magnetometer errors Method of correcting wellbore magnetometer errors

E - Fixed Constructions

21

B

E21B 47/022 (2006.01)

Patent

CA 2271156

The present invention is directed to a method for compensating for bias errors on one or more magnetometers used for one or more borehole directional surveys, comprising determining the constant or first-order varying bias values which minimize the variance of computed local magnetic field vectors with respect to central values, which may be either independent estimates of the local magnetic field vector or the mean values of the computed local magnetic field vectors.

Cette invention concerne un procédé permettant de compenser les erreurs de polarisation qui se produisent sur un ou plusieurs magnétomètres utilisés dans la surveillance directionnelle d'un ou de plusieurs puits de forage. Ce procédé consiste à déterminer les valeurs de polarisation constantes, ou variables et de premier ordre, qui permettent de minimiser la variance des vecteurs calculés du champ magnétique local par rapport à des valeurs centrales. Ces valeurs peuvent consister en des estimées indépendantes du vecteur du champ magnétique local ou, encore, en des valeurs moyennes des vecteurs calculés du champ magnétique local.

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