Determination of borehole geometry inside cased wells with...

Details Determination of borehole geometry inside cased wells with... Determination of borehole geometry inside cased wells with...

2006-05-23

2006-05-23

Patidar, Jay (Department: 2862)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

C324S326000, C324S343000, C324S372000, C324S207170

Reexamination Certificate

active

07049821

ABSTRACT:
A method is disclosed for locating a receiver in a borehole having a conductive liner by inducing an electromagnetic field from a transmitter in a first borehole, detecting at a first location by at least one receiver located in a second borehole having a conductive liner, a first electromagnetic field induced by the transmitter, detecting at a second location by the at least one receiver, a second electromagnetic field induced by the transmitter and calculating a set of geometry coordinates for the first location based on the first electromagnetic field and the second electromagnetic field.

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Uchida et al., “Effect of a Steel Casing on Crosshole EM Measurement,” SEG Annual Meeting, pp. 442-445 (Texas 1991).
Augustin et al., “A Theoretical Study of Surface-to-Borehole Electromagnetic Logging in Cased Holes,”Geophysics54:1, pp. 90-99 (Jan. 1989).
Wu and Tabashy, “Influence of Steel Casings on Electromagnetic Signals,”Geophysics 59:3, pp. 378-390 (Mar. 1994).

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