Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1991-11-21
1993-03-02
Gregory, Bernarr E.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 35, 367 75, 181102, 181105, G01V 140
Patent
active
H00011568
ABSTRACT:
In the present invention, characteristics of fractures or microcracks in earth formations surrounding a borehole are detected by use of conventional sonic logging devices used in combination with internal variations of wellborne pressure. A sonic logging tool is first used to generate a log of acoustic velocity at a first pressure. Borehole pressure is then changed and a second log is obtained. Significant changes in formation velocity in response to the pressure change indicates the presence of fractures.
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Gregory Bernarr E.
Metrailer Albert C.
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