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Title: Circuit for echo and noise suppression of acoustic signals transmitted through a drill string

An electronic circuit for digitally processing analog electrical signals produced by at least one acoustic transducer is presented. In a preferred embodiment of the present invention, a novel digital time delay circuit is utilized which employs an array of First-in-First-out (FiFo) microchips. Also, a bandpass filter is used at the input to this circuit for isolating drill string noise and eliminating high frequency output. 20 figures.
Inventors:
;
Issue Date:
OSTI Identifier:
5236189
Assignee:
SNL; EDB-94-056665
Patent Number(s):
US 5274606; A
Application Number:
PPN: US 7-858170
Contract Number:
AC04-76DP00789
Resource Relation:
Patent File Date: 24 Mar 1992
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; MWD SYSTEMS; SIGNAL CONDITIONING; ACOUSTIC MEASUREMENTS; DRILLING EQUIPMENT; ELECTRIC FILTERS; NOISE POLLUTION; SIGNAL-TO-NOISE RATIO; EQUIPMENT; FILTERS; POLLUTION; 440400* - Well Logging Instrumentation