초록 ▼

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

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.

대표청구항 ▼

An apparatus for orienting a logging or perforating instrument supported by a cable and disposed within a cased borehole to the lower side of said borehole, comprising; an elongated body member having a first end portion of generally circular lateral cross-section adapted to attach to said instrumen

An apparatus for orienting a logging or perforating instrument supported by a cable and disposed within a cased borehole to the lower side of said borehole, comprising; an elongated body member having a first end portion of generally circular lateral cross-section adapted to attach to said instrument; said body member having an elongated portion wherein the mass of said body member exhibits a generally truncated circular lateral cross-section, said truncated circular lateral cross-section being predominantly disposed to one side of the longitudinal axis of said body member; said body member having one or more longitudinal recesses within said elongated portion said longitudinal recesses generally centered upon the curvilinear portion of said truncated circular lateral cross-section of said body member; and one or more permanent magnets cooperatively arranged within said recesses.