Method for the detection and correction of magnetic interference

Details Method for the detection and correction of magnetic interference Method for the detection and correction of magnetic interference

1986-09-10

1988-08-09

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

Process

33312, 33313, E21B 47022

Patent

active

047618892

ABSTRACT:
A method is presented, for use in borehole drilling, for correcting errors in azimuth determination resulting from variations in the earth's magnetic field to which a measuring instrument is exposed. The method distinguishes between variations in the earth's magnetic field caused by the drillstring and variation caused by external sources, and the method corrects only for errors caused by the drillstring. If the error is caused by the drillstring, an azimuth correction is made based on dip angle data, thereby reducing errors caused by scale factor variations since dip angle is a ratio quantity of magnetic field components.

REFERENCES:
patent: 3935642 (1976-02-01), Russell
patent: 4163324 (1979-08-01), Russell et al.
patent: 4357660 (1982-11-01), Hepp

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