Patent · US Active

Subsurface resistivity modeling with electromagnetic fields using a conductive casing

US10114141B2 · kind B2 · utility

1Cited by

4References

23Claims

0Family size

Assignee

GroundMetrics, Inc. · US

Inventors

H. Frank Morrison · Berkeley, US
Clifford J. Schenkel · Concord, US
Andrew D. Hibbs · Village of La Jolla, US

Key dates

Filing date	Feb 20, 2015
Grant date	Oct 30, 2018
Priority date	—
Expiry date	Mar 30, 2035

Classification

Technology area (CPC G)Physics
CPC primaryG01V3/26
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A method for efficiently calculating a subsurface distribution of electrical resistivity or conductivity generated by an electromagnetic (EM) source is provided wherein a significant fraction of the electric current produced by a source flows along a casing of a borehole. The method is comprised of two steps: calculating EM fields produced by the casing in the background lithology; and calculating EM fields caused by a resistivity anomaly in the presence of an EM field produced by the casing within a subsurface or survey model that does not include the casing.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.