Applying E-field antennas to resistivity logging tools
OwnerWeishan Haninventor
Life of this patent
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Abstract
The present invention provides a methodology and system for resistivity tool design. By using at least one E field antenna instead of magnetic antennas, stronger signals can be captured by a smaller system. The more effective antenna design of the present invention has broad applications in various tools including geosteering, look ahead, and triaxial induction.
Claims16
A resistivity logging tool comprising a mandrel, at least one transmitting antenna mounted on the mandrel and at least one receiving antenna mounted on the mandrel, wherein at least one of the transmitting antenna or the receiving antenna is an electric field antenna, and the electric field antenna comprises:
- (1) two probes, which are respectively bent along the surface of the mandrel at different directions;
- or
- (2) a single probe, which is bent into a partial circle concentric to the mandrel along the surface of the mandrel, wherein the partial circle is about half of a full circle;
- or
- (3) wherein the mandrel comprises two grooves respectively on two opposite sides, and the electric field antenna comprises two probes, with one of the two probes installed on one of the two grooves, and the other probe installed on the other groove.
Dependencies are inferred from the claim text.