E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
33/92
E21B 47/02 (2006.01) E21B 47/022 (2006.01)
Patent
CA 1240499
METHOD FOR THE DETECTION AND CORRECTION OF MAGNETIC INTERFERENCE IN THE SURVEYING OF BOREHOLES Abstract of the Disclosure: 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.
481069
Cobern Martin E.
Hamlin Edmund M.
Stone Frederick A.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Teleco Oilfield Services Inc.
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