Magnetic induction technique for mapping vertical conductive fractures: electronic design

Technical Report · Fri Sep 01 04:00:00 EDT 1978

DOI:https://doi.org/10.2172/6804748· OSTI ID:6804748

Landt, J A; Koelle, A R; Trump, M A; Nickell, Jr, J D

This report is the last in a series that describes the preliminary design of an instrument capable of mapping conductive fractures deep below the surface of the earth. Earlier reports dealt with theoretical analysis, the general status of the instrument development, and materials vendor searches. Here, attention is focused on the electronics design and prototype hardware to perform the mapping task. A phase-sensitive detector is described that has a sensitivity in the tens of nanovolts. Coil-switching circuitry is also described, as well as a downhole data link tailor-made for this particular instrument's needs.

• Research Organization: Los Alamos Scientific Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6804748
• Report Number(s): LA-7426-MS
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150303* -- Geothermal Exploration & Exploration Technology-- Exploratory Drilling & Well Logging
440400 -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
DESIGN
ELECTRIC LOGGING
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EQUIPMENT
FAILURES
FRACTURES
GEOTHERMAL SYSTEMS
Geothermal Legacy
HOT-DRY-ROCK SYSTEMS
INDUCTION LOGGING
MAPPING
MAPS
OSCILLATORS
SPECIFICATIONS
TIMING CIRCUITS
WELL LOGGING