Nuclear magnetism logging tool using high-temperature...

Details Nuclear magnetism logging tool using high-temperature... Nuclear magnetism logging tool using high-temperature...

G - Physics

01

V

324/1.2

G01V 3/26 (2006.01) G01V 3/32 (2006.01)

Patent

CA 1293991

A B S T R A C T NUCLEAR MAGNETISM LOGGING TOOL USING HIGH-TEMPERATURE SUPERCONDUCTING SQUID DETECTORS 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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