Electromagnetic logging apparatus with slot antennas
This patent describes an apparatus for investigating formations surrounding a borehole, comprising: a logging device moveable through the borehole; a member mounted on the logging device and adapted for engagement with a wall of the borehole; a transmitting antenna mounted in a wall-engaging face of the member; a pair of spaced receiving antennas mounted in the wall-engaging face of the member in spaced relation to the transmitting antenna; each of the antennas comprising: a conductive base having a slot therein which opens toward the borehole wall, the slot being substantially filled with a dielectric material, a conductive probe in the slot, and a tuning element separate from the slot, the tuning element being coupled to the probe; means for energizing the transmitting antenna to transmit electromagnetic energy into the formations by applying a signal to the tuning element with respect to the base; and means for generating an output at each of the receiving antennas representative of electromagnetic energy received from the formations by obtaining a signal across the tuning element with respect to the base.
- Assignee:
- Schlumberger Technology Corp., New York, NY
- Patent Number(s):
- US 4689572
- OSTI ID:
- 6110748
- Country of Publication:
- United States
- Language:
- English
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ANTENNAS
BOREHOLES
CAVITIES
ELECTRIC CONDUCTIVITY
ELECTRIC LOGGING
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
ELECTRICAL SURVEYS
ELECTROMAGNETIC SURVEYS
EQUIPMENT
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
INDUCTION LOGGING
MAGNETIC PROBES
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
PHYSICAL PROPERTIES
PROBES
RESOURCES
SIGNALS
SPACE DEPENDENCE
SURVEYS
TUNING
WELL LOGGING
WELL LOGGING EQUIPMENT