FIELD: physics; geophysics.
SUBSTANCE: invention relates to electromagnetic induction well logging. A transmitter fitted on a bottom hole assembly (BHA) is used to generate a signal for generating an electromagnetic field directed into rock mass. A receiver fitted on the BHA receives signals which show resistivity of the rock mass and distance to the edges of the layers. Axes of the transmitter and receiver can pass in parallel or at an angle to the axis of the BHA. The transmitter and the receiver are fitted on the tubular member of the BHA. The tubular member has a damping part which includes a transverse slit for damping flow of eddy currents in the tubular member. The damping part also has at least one longitudinal slit made in the tubular element. Non-conducting material can be placed in the slit. The damping part includes a pipe section with non-conducting material, such as a ferrite, placed on the outer surface of that section.
EFFECT: attenuation of unwanted signals caused by eddy currents, without increasing distance between the transmitter and the receiver.
22 cl, 14 dwg
