Electromagnetic and magnetostatic shield to perform...

Details Electromagnetic and magnetostatic shield to perform... Electromagnetic and magnetostatic shield to perform...

2011-08-09

2011-08-09

Aurora, Reena (Department: 2858)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

C324S339000

Reexamination Certificate

active

07994790

ABSTRACT:
A transmitter on a bottomhole assembly (BHA) is used for generating a transient electromagnetic signal in an earth formation. A pair of receivers on the BHA receive signals that are indicative of formation resistivity and distances to bed boundaries. A time dependent calibration factor or a time-independent calibration factor may be used to combine the two received signals and estimate the distance to bed boundaries that are unaffected by the drill conductive body. Further improvement can be obtained by using copper shielding.

REFERENCES:
patent: 4700142 (1987-10-01), Kuckes
patent: 5452761 (1995-09-01), Beard et al.
patent: 6646441 (2003-11-01), Thompson et al.
patent: 6901521 (2005-05-01), Chauvel et al.
patent: 7046009 (2006-05-01), Itskovich
patent: 7150316 (2006-12-01), Itskovich
patent: 7167006 (2007-01-01), Itskovich
patent: 2003/0184303 (2003-10-01), Homan et al.
patent: 2007/0216416 (2007-09-01), Itskovich

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