Nuclear magnetism logging tool using high-temperature superconducting squid detectors
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United States of America Patent
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Jan 22, 1991
Issued Date -
N/A
app pub date -
Aug 31, 1989
filing date -
Nov 5, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A logging device is disclosed for measuring the nuclear magnetism response of earth formations. The device employs a detector that is capable of detecting sinusoidal and slowly varying changes in magnetic field caused by precession of mobile nuclei about the earth's magnetic field. Such a detector may be one or more laser-pumped helium magnetometers, or one or more high-temperature Superconducting Quantum Interference Devices (SQUID). The invention uses a micro-miniature Joule-Thomson refrigerator to maintain the high-temperature SQUIDs below their superconducting transition point. The SQUIDs are flux coupled in an axial gradiometer configuration to reduce motion-induced magnetic noise.
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