Method to determine local variations of the earth's magnetic field and location of the source thereof
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United States of America Patent
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Sep 20, 2016
Grant Date -
Mar 20, 2014
app pub date -
Sep 9, 2013
filing date -
Sep 14, 2012
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Abstract
A method to determine the earth's magnetic field vector along a sub-surface wellpath having unknown and possibly changing azimuth, in the presence of a magnetic disturbance caused by a magnetic source external to the wellpath includes estimating the three components of the earth field along the three axes of a magnetic sensor package by a polynomial function of measured depth along the wellpath. Upon removal of the earth's magnetic field from the measurements, the resultant magnetic field of the disturbance is determined and can be used to determine the position and orientation of the source of the disturbance.
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