Nuclear magnetism logging tool using high-temperature supercondu

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

1989-08-31

1991-01-22

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using well logging device

G01V 300

Patent

active

049873687

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.

REFERENCES:
patent: 3462674 (1969-08-01), Baker et al.
patent: 4390840 (1983-01-01), Ganssen et al.
patent: 4656422 (1987-04-01), Vail, III et al.
patent: 4777443 (1988-10-01), Yabusaki et al.
"NQR detected at 30 MHz with a DC SQUID", by C. Hilbert et al., Appl. Phys. Lett. 47(6) Sep. 15, 1985.

Affiliated with

Also associated with

Rating

Nuclear magnetism logging tool using high-temperature supercondu does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Nuclear magnetism logging tool using high-temperature supercondu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nuclear magnetism logging tool using high-temperature supercondu will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1556818