Circumferential acoustic device

Patent · Tue Oct 06 04:00:00 EDT 1981

OSTI ID:6473631

Herolz, R A; Vogel, C B

A method and apparatus for acoustical logging wherein a plurality of transducers are spaced circumferentially in a plane perpendicular to the borehole and in close proximity to the wall of the borehole. Numerous circumferential acoustic transmission paths are defined by using some of the transducers as transmitters and others as receivers. Ultrasound is transmitted and received separately along each of the paths and amplitudes of the received waves are separately recorded to provide a side-byside comparison of the signals. The received waves may be comprised of shear waves and compressional waves, and the shear wave amplitude may be recorded to the exclusion of later arriving waves. Proper spacing of the transmitters and receivers will produce a complete circumferential acoustic log of the borehole that can be used to detect the presence of vertical fractures.

• Assignee: Shell Oil Co
• Patent Number(s): US 4293934
• OSTI ID: 6473631
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
ACOUSTIC MEASUREMENTS
BOREHOLES
CAVITIES
DESIGN
ELECTRONIC EQUIPMENT
EQUIPMENT
FAILURES
FRACTURES
FUNCTION GENERATORS
OIL WELLS
PULSE GENERATORS
SEISMIC S WAVES
SEISMIC WAVES
SIGNALS
SONIC LOGGING
SOUND WAVES
ULTRASONIC WAVES
WELL LOGGING
WELL LOGGING EQUIPMENT
WELLS