Borehole logging tools and methods using reflected electromagnet

Details Borehole logging tools and methods using reflected electromagnet Borehole logging tools and methods using reflected electromagnet

1995-02-03

1996-06-25

O'Shea, Sandra L.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324333, G01V 308

Patent

active

055303595

ABSTRACT:
A borehole logging tool such as a wireline logging tool or a logging-while drilling tool includes a tool body; a transmitting antenna located in the body; a pulser for causing the transmitting antenna to transmit an electromagnetic signal; a receiving antenna, located in the body, which includes an array of receiver elements disposed around the longitudinal axis of the tool body; and electronics for measuring the difference in signals detected by pairs of elements in the array. The receiver elements can be linear dipole elements and the electronics for analyzing the signals measures the difference in signals measured by pairs of elements so as to determine the direction of a reflecting structure from the tool.

REFERENCES:
patent: 2689329 (1954-09-01), Zimmerman
patent: 3012189 (1961-12-01), Doll
patent: 4670717 (1987-06-01), Sender
patent: 4728897 (1988-03-01), Gunton
patent: 4746867 (1988-05-01), Gunton
patent: 4814768 (1989-03-01), Chang

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