Microstrip antenna-based logging tool and method
AssigneeHalliburton Energy Services, Inc.
InventorsGlenn Andrew Wilson, Luis San Martin, Li Pan, Burkay Donderici
Life of this patent
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Abstract
A dielectric logging tool for use in a borehole that penetrates a subsurface formation, includes: at least one wall-contacting face with one or more embedded microstrip antennas including a transmit antenna; an oscillator that supplies a transmit signal; a coherent receiver that measures the one or more scattering coefficients; and a processor that derives a formation property from the one or more scattering coefficients. The tool may be conveyed along a borehole, with the scattering coefficients and derived formation property values associated with tool position and orientation to provide a permittivity log.
Claims20
A logging tool for use in a borehole that penetrates a subsurface formation, the tool comprising:
- at least one wall-contacting face that includes:
- a substrate layer disposed on the at least one wall-contact face;
- a coating layer disposed on the substrate layer, wherein the coating layer is a polytetrafluoroethylene, a chemically-inert layer, a non-conductive layer, a ceramic, or an alumina;
- one or more microstrip antennas disposed on the coating layer, the one or more microstrip antennas including a transmit antenna;
- and
- a protective layer disposed over the one or more microstrip antennas and the coating layer, wherein the protective layer is a second ceramic, a polymer, or a carbon fiber resin;
- an oscillator coupled to the transmit antenna to supply a transmit signal;
- a coherent receiver coupled to the one or more microstrip antennas to measure one or more scattering coefficients;
- a directional coupler that is connected to the one or more microstrip antennas and the coherent receiver;
- and
- a processing unit coupled to the coherent receiver to derive a formation property from the one or more scattering coefficients.
A logging method that comprises:
- moving a logging tool along a borehole, wherein the logging tool includes:
- at least one wall-contacting face that includes:
- a substrate layer disposed on the at least one wall-contact face;
- a coating layer disposed on the substrate layer, wherein the coating layer is a polytetrafluoroethylene, a chemically-inert layer, a non-conductive layer, a ceramic, or an alumina;
- one or more microstrip antennas disposed on the coating layer, the one or more microstrip antennas including a transmit antenna;
- and
- a protective layer disposed over the one or more microstrip antennas and the coating layer, wherein the protective layer is a second ceramic, a polymer, or a carbon fiber
- measuring one or more scattering coefficients of the one or more microstrip antennas;
- determining formation values based at least in part on the one or more scattering coefficients;
- and
- associating the formation values with tool position to provide a log.
Dependencies are inferred from the claim text.