Differential noise logging method and apparatus

Details Differential noise logging method and apparatus Differential noise logging method and apparatus

G - Physics

01

V

349/6

G01V 1/36 (2006.01) G01V 1/40 (2006.01) G01V 1/44 (2006.01)

Patent

CA 1184288

Abstract of the Disclosure The present invention provides a method and apparatus of differential noise logging. The apparatus includes a mandrel supporting at least two differentially connected acoustic transducers. The noise signals detected by the transducers are filtered, processed by RMS circuits and then subtracted one from another to effectively eliminate road noise. A telemetry system is utilized to send the signals uphole for recording. The differential logging method includes continuous movement of the differential noise logging tool to identify producing perforations, distinguish flow through perforations from flow being casing, and to identify sand jet entry into a cased well.

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