Method and apparatus for dielectric well logging of subsurface earth formations with a lumped constant antenna

Patent · Tue Jul 07 00:00:00 EDT 1987

OSTI ID:6307183

Janes, T A

This patent describes a well logging tool for use in obtaining an indicator of the dielectric constant of subsurface earth formations traversed by a borehole, comprising: an antenna housing means defining an X axis extending longitudinally along the housing means for contacting the wall of the borehole; a first and a second transmitter antenna means carried by the housing means and spatially distributed along a line parallel to the X axis and adjacent respective ends of the housing means for transmitting electromagnetic energy of a preselected frequency into the formation; and a first and a second receiver antenna means carried by the housing means and spatially distributed adjacent each other along the line and intermediate of the first and second transmitter antenna means for receiving electromagnetic energy from the formation each antenna means comprising: an outer aperture defined by the housing; a feed-through terminal having an electrical contact extending in the outer aperture; a filler plug within the aperture; an antenna slot element disposed on the housing and defining with the outer aperture an electrically resonant cavity element defines an elongated lot extending in a direction perpendicular to the axis; an antenna insulator plug sealingly and slidably disposed within the slot; an elongate inductor carried on the filler plug adjacent the slot in the antenna slot element and in electrical contact with the housing at one end of the inductor; and a lumped constant resonating means interconnected between the terminal contact and the other end of the inductor forming an electrically resonating circuit.

• Assignee: Dresser Industries, Inc., Dallas, TX
• Patent Number(s): US 4678997
• OSTI ID: 6307183
• Resource Relation: Patent File Date: Filed date 20 Aug 1984
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
58 GEOSCIENCES
ELECTRIC LOGGING
ANTENNAS
WELL LOGGING EQUIPMENT
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
BOREHOLES
CLOSURES
DIELECTRIC PROPERTIES
ELECTRICAL INSULATORS
ELECTROMAGNETIC RADIATION
CAVITIES
ELECTRICAL EQUIPMENT
ELECTRICAL PROPERTIES
EQUIPMENT
GEOLOGIC DEPOSITS
MINERAL RESOURCES
PHYSICAL PROPERTIES
RADIATIONS
RESOURCES
WELL LOGGING
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration
580203 - Geophysics- Geophysical Survey Methods- (1980-1989)