Magnetic mark detection

Details Magnetic mark detection Magnetic mark detection

1994-11-09

1996-08-20

Fulton, Christopher W.

Geometrical instruments

Distance measuring

Sounding type

33708, 33719, 33735, 33739, G01B 726

Patent

active

055466729

ABSTRACT:
A method and apparatus for detecting magnetic marks on a wireline logging cable and for more accurately making depth measurements during logging is described. The method uses depth-based, rather than time-based, samples and calculations. A Hall Effect sensor samples the cable at regular depth intervals approximated by an encoder mechanism. The signal values from the Hall Effect sensor are signal processed to better discriminate the precise location of the magnetic marks on the cable. The location of the magnetic marks is used to refine the depth measurements from the encoder mechanism. Depth-based sampling eliminates detection dependence on cable speed, enhances detection ability, reduces computational load, and leads to more accurate determination of the location of magnetic marks.

REFERENCES:
patent: 3566478 (1971-03-01), Hurlston
patent: 3978588 (1976-09-01), Richardson et al.
patent: 4179817 (1979-12-01), Lavigne et al.
patent: 4597183 (1986-07-01), Broding
patent: 4718168 (1988-01-01), Kerr
patent: 4924596 (1990-05-01), Vachon

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