Acoustic apparatus and method for detecting borehole wall discon

Details Acoustic apparatus and method for detecting borehole wall discon Acoustic apparatus and method for detecting borehole wall discon

1981-12-18

1989-12-05

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

181105, 367911, G01V 140

Patent

active

048857238

ABSTRACT:
Apparatus and methods are described for detecting fractures in a wall of a borehole penetrating an earth formation. An acoustic transducer produces pulses of acoustic energy at beam forming frequencies with the direction of the beam being so oriented as to preferentially excite transverse waves in the wall of the borehole. Discontinuities such as fractures cause a reflection of the transverse waves and these in turn are detected so that a positive identification of fractures is obtained. Fractures having various inclination angles are detected by employing apparatus and methods for scanning the acoustic beam while maintaining its orientation which preferentially enhances transverse waves. In this manner the transverse waves may be directed perpendicular to the fractures to enhance detectable reflections. A transducer employing an array of individually excitable acoustic elements is described with associated controls.

REFERENCES:
patent: 3406776 (1968-10-01), Henry
patent: 3474878 (1969-10-01), Loren
patent: 3496533 (1970-02-01), Semmelink
patent: 3500950 (1970-03-01), Roever
patent: 3949352 (1976-04-01), Vogel
patent: 4319345 (1982-03-01), Dennis

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