Ultrasonic logging apparatus with improved receiver

Patent · Tue Apr 10 04:00:00 EDT 1990

OSTI ID:7088440

Gard, M F

This paper describes an ultrasonic logging apparatus for use in a well borehole. It comprises: ultrasonic transducer means for generating and receiving acoustic signals; transmitter means for exciting the transducer means so that the transducer means will generate an acoustic wave-form, the transmitter means connected with the transducer means, the transmitter means exciting the transducer means at periodic intervals of time; receiver means for receiving an acoustic return from the generated acoustic waveform; the receiver means comprising the amplifier means, the amplifier means comprising gain switching means for changing the gain of the amplifier means, the gain switching means comprising a resistive feedback network of plural resistive elements with the gain of the amplifier means dependent upon which resistive elements are connected in feedback and control means for controlling the junction field-effect transistors so as to automatically switch the gain of the amplifier means during the reception of the acoustic return.

• Assignee: Atlantic Richfield Co., Los Angeles, CA
• Patent Number(s): US 4916648; A
• Application Number: PPN: US 7-366201A
• OSTI ID: 7088440
• 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
ACOUSTIC MEASUREMENTS
ACOUSTIC TESTING
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
EQUIPMENT
EXPLORATORY WELLS
GEOLOGIC DEPOSITS
MATERIALS TESTING
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NONDESTRUCTIVE TESTING
PETROLEUM DEPOSITS
RESOURCES
SONIC LOGGING
TESTING
TRANSDUCERS
ULTRASONIC TESTING
WELL LOGGING
WELL LOGGING EQUIPMENT
WELLS