Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
Patent
1997-08-08
1999-09-28
McElheny, Jr., Donald E.
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Earth science
G06F 1900
Patent
active
059603704
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. Magnetic survey accuracy is thereby improved. 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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Towle James N.
Van Steenwyk Donald H.
Haefliger William W.
McElheny Jr. Donald E.
Scientific Drilling International
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