Method and apparatus for measuring the earth formation resistivity of a plurality of radial regions around a borehole

Patent · Tue Sep 08 00:00:00 EDT 1987

OSTI ID:5922830

Locke, S; Gouilloud, M

This patent describes an apparatus for providing signals indicative of the electrical resistivity of a subsurface formation traversed by a borehole, comprising: an elongate sonde body adapted for longitudinal movement through the borehole. The body includes a first electrically conductive body section operative to emit electrical current, an insulating section, and a second electrically conductive body section in endwise connection; a pad connected to the sonde body and having a borehole wall engaging face of conductive material. The pad includes at least three current electrodes disposed at different longitudinal locations along the conductive face. The electrodes are operative to emit survey current; means electrically connected to the conductive face and to the first conductive body section for maintaining the conductive face and the first conductive body section at substantially equal electrical potential; electrical conductor means carried by the apparatus for returning current emitted from the first conductive body section and the conductive face; and means connected to the pad and to the sonde body for urging the conductive face into engagement with the wall of a borehole and for maintaining the conductive face at least partially within a current field emitted from the conductive body section.

• Assignee: Schlumberger Technology Corp., New York, NY
• Patent Number(s): US 4692707
• OSTI ID: 5922830
• Resource Relation: Patent File Date: Filed date 6 Jul 1983
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
OIL WELLS
RESISTIVITY LOGGING
PETROLEUM DEPOSITS
WELL LOGGING EQUIPMENT
DESIGN
BOREHOLES
ELECTRIC CONDUCTIVITY
ELECTRIC CONDUCTORS
ELECTRIC CURRENTS
ELECTRODES
EXPLORATION
GEOPHYSICS
MEASURING METHODS
PROBES
SIGNALS
CAVITIES
CURRENTS
ELECTRIC LOGGING
ELECTRICAL PROPERTIES
EQUIPMENT
GEOLOGIC DEPOSITS
MINERAL RESOURCES
PHYSICAL PROPERTIES
RESOURCES
WELL LOGGING
WELLS
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration