Acoustics – Geophysical or subsurface exploration – Well logging
Patent
1987-09-08
1989-05-23
Tarcza, Thomas H.
Acoustics
Geophysical or subsurface exploration
Well logging
181108, 367 25, G01V 140
Patent
active
048321486
ABSTRACT:
An acoustic borehole well logging method and apparatus for measuring azimuthal anisotropy of a formation traversed by a borehole using at least one multipole transducer. In a preferred embodiment, a dipole wave transmitter and at least one detector sensitive to dipole waves are employed. In an alternative preferred embodiment, a monopole transmitter and at least one multipole detector are employed. In the inventive method, two acoustic wave arrivals are detected, each associated with a different azimuthal orientation relative to the longitudinal axis of the borehole (i.e. each is transmitted by a multipole transmitter oriented at such angle, or is detected by a multipole detector oriented at such angle, or both). The inventive apparatus preferably includes at least one transducer unit including two or more multipole transmitters (or two or more multipole detectors) oriented at different azimuthal angles relative to the tool's longitudinal axis.
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U.S. patent application Ser. No. 379,684, filed May 9, 1982, and assigned to the assignee of the present application.
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Becker David F.
Chen Sen-Tsuen
Perelberg Azik I.
Winbow Graham A.
Equitz Alfred A.
Exxon Production Research Company
Hoster Jeffrey M.
Lobo Ian J.
O'Niell Herbert E.
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