Antenna construction for well logging of subsurface earth formations
An antenna is described for subsurface use in investigating an earth formation traversed by a borehole, comprising: an antenna housing defining a generally cylindrical cavity therein and a slot, the housing being selectively positionable against the wall of the borehole, and the slot being elongate in a direction defined by a plane perpendicular to the borehole when the housing is positionable against the borehole wall; an inductive element positioned within the cavity and adjacent the slot having first and second ends, the first end being grounded to the housing; a resonator means interconnected to the second end of the inductive element for forming an electrically resonating circuit with the inductive element, the cavity, and the slot at a preselected frequency; and an insulator plug fluid sealingly disposed and moveable with the slot for providing pressure balancing between the cavity and the borehole.
- Assignee:
- Dresser Industries, Inc., Dallas, TX
- Patent Number(s):
- US 4651100
- OSTI ID:
- 6671646
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
ANTENNAS
BOREHOLES
CAVITIES
CONTROL
ELECTRIC LOGGING
ELECTRICAL EQUIPMENT
ELECTRONIC EQUIPMENT
EQUIPMENT
FREQUENCY SELECTION
GEOLOGIC DEPOSITS
INDUCTION LOGGING
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
PLUGGING AGENTS
PRESSURE CONTROL
RESONATORS
RESOURCES
WELL LOGGING
WELL LOGGING EQUIPMENT