Magnetic head for conductivity imaging for use in boreholes

Details Magnetic head for conductivity imaging for use in boreholes Magnetic head for conductivity imaging for use in boreholes

2006-10-05

2008-09-02

Aurora, Reena (Department: 2862)

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

C324S324000, C324S204000

Reexamination Certificate

active

07420373

ABSTRACT:
A sensor for performing micro-conductivity measurements during well logging measurements in a borehole includes a magnetic core having a conductive insert wherein windings are driven with alternating current. Some embodiments include a sensor further having a conductive case. Various aspects of the sensor, such as dimensions and conductive properties of fabrication materials are selected to maximize performance of the sensor. Methods for using the sensor call for, among other things, placing the sensor in a well logging tool, and placing the tool in a well bore. A substantial focusing of the magnetic field on the wall of the borehole is achieved and provides for high quality data.

REFERENCES:
patent: 2693508 (1954-11-01), Lord
patent: 5734535 (1998-03-01), Nakata et al.
patent: 6815954 (2004-11-01), Iwanicki et al.
patent: 2005/0242819 (2005-11-01), Gold et al.
patent: 2006/0022887 (2006-02-01), Bittar et al.

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