Determining beacon location using magnetic field ratios

Details Determining beacon location using magnetic field ratios Determining beacon location using magnetic field ratios

2007-12-17

2010-02-16

LeDynh, Bot L (Department: 2858)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

By magnetic means

C324S338000, C175S040000, C175S045000, C702S141000, C702S158000, C340S853100, C340S853800, C340S854100

Reexamination Certificate

active

07663373

ABSTRACT:
A method and system for identifying a location of a magnetic field source. A total magnetic field is measured during a calibration routine prior to a drilling procedure. During the drilling procedure, a magnetic field measurement is obtained. Using a ratio of the measured magnetic field and the calibrated field, a set of possible angles and distances is calculated. After the source is advanced a known distance, a second magnetic field measurement is obtained. A second ratio is calculated and a second set of possible angles and distances is calculated. The relative location of the source is then determined using the first set and second set of values, along with the known distance and a pitch angle of the source.

REFERENCES:
patent: 5878825 (1999-03-01), Okuyama et al.
patent: 6693429 (2004-02-01), Mercer

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