FIELD: physics.
SUBSTANCE: use: for measurement of electrical resistivity of geological formations. Summary of invention consists in the fact that a proposed unit comprises tool spindle with tool axis and coil comprising multiple turns wound around tool spindle at winding angle deviated from tool axis. Soft magnetic strip is located radially between coil and tool spindle and passes around tool spindle circle at strip angle perpendicular to winding angle. Soft magnetic strip comprises multiple inserts, and between each adjacent on side inserts there is a gap, wherein said gap extends parallel to tool axis.
EFFECT: technical result is enabling shield coil turns from adjacent collars of weighted drill pipe.
18 cl, 23 dwg
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