Technique for separating electromagnetic refracted signals from reflected signals in down hole electromagnetic tools

Patent · Mon Nov 18 23:00:00 EST 1991

OSTI ID:5453564

Rau, R N

This patent describes an apparatus for conducting a survey of formations adjacent to a well borehole. It comprises a transmitter means for forming a signal to be transmitted in the frequency range from 20 megahertz to 2.0 gigahertz; transmitter antenna means connected to the transmitter for forming a transmitted signal, the antenna means forming a signal having a known direction of circular polarization and for transmitting the signal into the borehole and surrounding earth formation; and receiver antenna means longitudinally spaced from the transmitter antenna for receiving a signal returned by formations adjacent to the well borehole as a result of operation of the transmitter.

• Assignee: Halliburton Logging Services, Inc., Houston, TX (United States)
• Patent Number(s): A; US 5066916
• Application Number: PPN: US 7-463204
• OSTI ID: 5453564
• 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
440700 -- Geophysical & Meteorological Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
BOREHOLES
CAVITIES
ELECTRICAL SURVEYS
ELECTROMAGNETIC SURVEYS
EQUIPMENT
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
SURVEYS
WELLS