Boots – shoes – and leggings
Patent
1992-04-16
1994-04-19
Weinhardt, Robert A.
Boots, shoes, and leggings
324346, G06F 1520
Patent
active
053052129
ABSTRACT:
Magnetic field gradient sensing apparatus utilizing highly sensitive fluxgate magnetometers permit direct determination of the distance between two well bores and for determining the direction from one bore to the other. The gradient sensing apparatus may be responsive to alternating magnetic fields resulting from current flow in a steel casing within a target well and measured by two fluxgate magnetometers diametrically oppositely located in a sensor tool and oriented to measure the vector components of the alternating field at opposite sides of the tool to thereby obtain a measure of the gradient of the field across the diameter of the tool. Field gradient sensing apparatus may also be used to measure the gradient of a static magnetic field having a radial gradient, wherein the static field is produced by ferromagnetic materials in the target well. Again, a pair of magnetometers is utilized to measure the field gradient across the diameter of the sensor to determine distance and direction to the target. Both static and alternating magnetic fields may be simultaneously measured for improved accuracy and reliability.
REFERENCES:
patent: 3317821 (1967-05-01), Patton et al.
patent: 4072200 (1978-02-01), Morris et al.
patent: 4293815 (1981-10-01), West et al.
patent: 4323848 (1982-04-01), Kuckes
patent: 4372398 (1983-02-01), Kuckes
patent: 4437064 (1984-03-01), Overton, Jr. et al.
patent: 4443762 (1984-04-01), Kuckes
patent: 4502010 (1985-02-01), Kuckes
patent: 4529939 (1985-07-01), Kuckes
patent: 4700142 (1987-10-01), Kuckes
patent: 4791373 (1988-12-01), Kuckes
patent: 4845434 (1989-07-01), Kuckes et al.
patent: 4901023 (1990-02-01), Vail, III
patent: 4933640 (1990-06-01), Kuckes
patent: 5064006 (1991-11-01), Waters et al.
patent: 5084678 (1992-01-01), Hutin
patent: 5218301 (1993-06-01), Kuckes
"Successful ELREC Logging for Casing Proximity in an Offshore Louisiana Blowout", C. L. West et al. SPE 11996; 8 pages, 1983.
Vector Magnetics Inc.
Weinhardt Robert A.
LandOfFree
Alternating and static magnetic field gradient measurements for does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Alternating and static magnetic field gradient measurements for , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alternating and static magnetic field gradient measurements for will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-25070