Apparatus for decentralizing and orienting a well logging or per

Details Apparatus for decentralizing and orienting a well logging or per Apparatus for decentralizing and orienting a well logging or per

1981-10-26

1984-03-27

Novosad, Stephen J.

Wells

With electrical means

166 551, 175 451, 175 45, E21B 43119

Patent

active

044388101

ABSTRACT:
An elongated body member adapted for coupling to a well logging or perforating instrument in a fixed rotational relation, and formed such that at least a portion of the mass is eccentrically disposed relative to the longitudinal axis of the body member. Located within the eccentric mass of the body member is a recess for retaining one or more magnets. When the orienting decentralizer is introduced into a borehole, virtually any deviation of the borehole from true vertical will cause the longitudinal axis of the body member to tilt and the eccentric mass will cause the decentralizer to rotate about its longitudinal axis and seek equilibrium with the eccentric mass uniformly disposed beneath the tilted axis of the body member, thus rotating the attached logging or perforating instrument to a predictable orientation relative to the lower side of the borehole. In this orientation, within a cased borehole, the magnets will exert an attractive force upon the well casing to resist any departure from this predictable orientation.

REFERENCES:
patent: 904673 (1908-11-01), Bideker
patent: 2692754 (1954-10-01), Butterworth
patent: 3165153 (1965-01-01), Lanmon
patent: 3182724 (1965-05-01), Shore
patent: 3396799 (1968-08-01), Anderson et al.
patent: 3730282 (1973-05-01), Chapman
patent: 3842918 (1974-10-01), Wolk
patent: 4153118 (1979-05-01), Hart
patent: 4194577 (1980-05-01), Vann
patent: 4269278 (1981-05-01), Vann

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