Passive ranging techniques in borehole surveying

Details Passive ranging techniques in borehole surveying Passive ranging techniques in borehole surveying

2005-08-30

2005-08-30

Le, N. (Department: 2858)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

Using electrode arrays, circuits, structure, or supports

C324S346000, C175S061000

Reexamination Certificate

active

06937023

ABSTRACT:
A method for determining the location of a target subterranean structure from within an adjacent borehole is disclosed which uses first and second gravity measurement devices disposed at corresponding first and second positions in the adjacent borehole and a magnetic field measurement device disposed one of the first and second positions. The method includes processing a total local magnetic field, a reference magnetic field, and a local azimuth determined using the gravity measurement devices to determine a portion of the total magnetic field attributable to the subterranean structure multiple points in the adjacent borehole. The location of the subterranean structure is determined using the portion of the total magnetic field attributable thereto. A system adapted to execute the disclosed method and a computer system including computer-readable logic configured to instruct a processor to execute the disclosed method are also provided.

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Marketing material MagTraC 06-03 by Scientific Drilling available for download at http://www.scientificdrilling.com/pdf/magtrac%20overview.pdf., no date.

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