Dielectric well logging system and method with error correction

Patent · Tue Jul 11 04:00:00 EDT 1978

OSTI ID:6480370

Thompson, L W; Bridges, J R; Fuchs, J A

A dielectric well logging system includes a logging tool adapted to be passed through a borehole traversing an earth formation. The logging tool includes a transmitter which induces electric energy into the earth formation at a radio frequency. Two receivers in the logging tool spaced a distance apart provides intermediate frequency signals corresponding to the electrical energy received from the earth formation. The intermediate frequency signals are transmitted by a cable to the surface. Surface electronics include zero crossing detectors, each detector receives a different intermediate frequency signal from the cable and provides a detector signal whose change in amplitude is representative of the intermediate frequency signal passing through zero. A source provides clock pulses at a frequency greater than the frequency of the intermediate frequency signals. A logic circuit receiving the detector signals and the clock pulses provides clock pulses in accordance with the detector signals. The number of clock pulses in each group corresponds to the dielectric constant of the earth formation.

• Assignee: Texaco, Inc.
• Patent Number(s): US 4100483
• OSTI ID: 6480370
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200 -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
440400* -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
BOREHOLES
CAVITIES
DESIGN
DIELECTRIC PROPERTIES
ELECTRIC LOGGING
ELECTRICAL PROPERTIES
ELECTRONIC CIRCUITS
GEOLOGIC FORMATIONS
PHYSICAL PROPERTIES
SIGNALS
WELL LOGGING