Apparatus and method for reducing effects of eccentricity in induction tools
AssigneeBaker Hughes Incorporated
InventorsSheng Fang, David R. Beard
Life of this patent
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Abstract
In aspects, an apparatus for use in a wellbore for determining a property of an earth formation is provided. The apparatus, in one embodiment, may include a tool body including a transmitter configured to induce electromagnetic waves in an earth formation, a receiver configured to provide signals responsive to the induced electromagnetic waves, a conductive member between the transmitter and the receiver extending radially from the tool body and configured to reduce propagation of eddy currents between the transmitter and the receiver when the tool body is in a wellbore and a processor configured to process the signals provided by the receiver to determine the property of the earth formation.
Claims20
An apparatus for use in a wellbore for estimating a property of a formation,
- comprising:
- a transmitter configured to induce electromagnetic waves in the formation;
- a receiver configured to provide signals responsive to the induced electromagnetic waves;
- a conductive member between the transmitter and the receiver extending outward from a tool body configured to reduce propagation of eddy currents through a fluid in the wellbore between the transmitter and the receiver;
- and
- a processor configured to process the signals provided by the receiver to estimate the property of the formation.
A method of estimating a property of a formation, comprising:
- conveying a tool including a transmitter and a receiver into a wellbore containing a fluid;
- inducing electromagnetic waves in the formation using the transmitter;
- reducing propagation of eddy currents traveling in the fluid between the transmitter and the receiver using a conductive member extending outward from the tool body between the transmitter and the receiver;
- detecting signals responsive to the induced electromagnetic waves in the formation using the receiver;
- and
- processing the detected signals by a processor to estimate the property of the earth formation.
An apparatus for use downhole, comprising:
- a tool configured to be conveyed into a wellbore, the tool including a transmitter configured to transmit electromagnetic waves;
- a receiver configured to detect signals from a formation responsive to the transmitted electromagnetic waves;
- and
- a conductive member between the transmitter and the receiver extending outward from a tool body configured to reduce propagation of eddy currents between the transmitter and the receiver when the tool is downhole.
Dependencies are inferred from the claim text.