Geometrical instruments – Area integrators – Electrical
Patent
1973-08-06
1976-09-07
Aegerter, Richard E.
Geometrical instruments
Area integrators
Electrical
324 34PS, 340282, 346 33WL, 360 1, G08B 2100, G01R 116
Patent
active
039785882
ABSTRACT:
A method and apparatus for providing a signal when equipment being run into or out of a well on a magnetizable wire line reaches a previously visited point in the well below the surface. With the equipment at the point in the well to be revisited, a magnetic mark is applied on the wire line at an appropriate spot at the surface. The magnetic mark may be of one or more dipoles and in the case of three or more dipoles they are arranged in close proximity along the length of the wire line with alternately opposite polarities and on a common axis of polarity, with said axis substantially paralleling the length of the wire line. Subsequently, in running the equipment in or out, at least one of the magnetic dipoles is detected at the same appropriate spot at the surface and is used to actuate a signaling device. In the case of a multiple dipole magnetic mark, the alternating opposite polarity of the dipoles causes the end dipoles to resist the weakening of the central dipole, or dipoles, which would otherwise diminish in strength with time due to the spreading of magnetic energy along the magnetically soft wire line.
REFERENCES:
patent: 2655633 (1953-10-01), Minor et al.
patent: 2753832 (1956-07-01), Tinsley
patent: 2806372 (1957-09-01), Arps
patent: 3066253 (1962-11-01), Bowers
patent: 3150358 (1964-09-01), Newman et al.
patent: 3303483 (1967-02-01), Rabinow
patent: 3368208 (1968-02-01), Lippmann et al.
patent: 3466535 (1969-09-01), Sterns et al.
patent: 3541573 (1970-11-01), Ault et al.
Johnston Norris
Richardson Robert L.
Aegerter Richard E.
Shepperd John W.
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