METHOD FOR CORRECTING MAGNETIC MEASUREMENTS MADE IN A WELL BY A MEASURING APPARATUS, FOR THE PURPOSE OF DETERMINING ITS AZIMUT.

摘要

P - A measuring tool including a device (4) for measuring the earth's magnetic field, is inserted on a lining (2) connecting a drilling tool (3) to a surface installation. The method makes it possible to overcome the disturbance affecting the measured terrestrial magnetic field and due for example to the drill string. It comprises stopping the tool during its progression in the well in successive stop positions longitudinally offset from each other, the angular position of the measuring apparatus (4) in these positions being random , and the use of a statistical calculation method to combine the different measurements and to determine the disturbing field. BR/ - Application to the determination of the azimuth and inclination of a well for example. / P