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Title: Autonomous data transmission apparatus

A autonomous borehole data transmission apparatus is described for transmitting measurement data from measuring instruments at the downhole end of a drill string by generating pressure pulses utilizing a transducer longitudinally responsive to magnetic field pulses caused by electrical pulses corresponding to the measured downhole parameters. 4 figs.
Inventors:
Issue Date:
OSTI Identifier:
458573
Assignee:
PTO; SCA: 440400; PA: EDB-97:057037; SN: 97001758979
Patent Number(s):
US 5,615,172/A/
Application Number:
PAN: 8-636,175
Contract Number:
AC07-94ID13223
Resource Relation:
Other Information: PBD: 25 Mar 1997
Research Org:
Lockheed Martin Idaho Tech Co
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; MWD SYSTEMS; DATA TRANSMISSION SYSTEMS; PULSE TECHNIQUES; PRESSURIZATION; MAGNETIC FIELDS; ELECTRIC FIELDS; OPERATION