US 6,714,153 B1Granted

Device for electromagnetic detection of geological properties in a well

AssigneesDen Norske Stats Oljeselskap A.S., Kongsberg Offshore AS, Norges Geotekniske Institutt

InventorsFan-Nian Kong, Svein Ellingsrud, Vidar Sten-Halvorsen, Einar Stølen, Harald Westerdahl, Terje Eidesmo

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Abstract

The invention is a well radar for detecting, by electromagnetic wave reflection, resistivity horizons in production zones in oil wells. Transmitter and receiver antennas are combined in a tubing string antenna module. Two dipole transmitter antenna are positioned in a first position on either side of the tubing string antenna module. A first directionally sensitive group of four dipole receiver antennas is positioned in a second positioned so that the receiver antennas have even angular separation. Likewise, a second directionally sensitive group of four dipole receiver antennas is positioned in a third position opposite the first directionally sensitive group.

Claims18

Dependent claims

A device for detection of electrical properties in a geological formation via a well adapted to receive a tubing string, comprising:

at least one transmitter antenna, for emission of electromagnetic waves to be reflected, arranged along the tubing string in a fixed and permanent position thereon, and unshielded with respect to the geological formation;
at least one receiver antenna for receiving the reflected electromagnetic waves, arranged along the tubing string in a fixed and permanent position thereon, and unshielded with respect to the geological formation;
and
an electronics package comprising a signal generator adapted to apply electromagnetic signals to the at least one transmitter antenna for the emission of coherent, continuous, electromagnetic waves successively at a plurality of frequencies.

1 more element

Dependencies are inferred from the claim text.