ELECTROMAGNETIC LOGGING METHOD Russian patent published in 2017 - IPC G01V3/30 

FIELD: oil and gas industry.

SUBSTANCE: method includes the operations of probing electromagnetic field excitation in control zones and measuring of controlled borehole environment reaction signals with via respectively transmitting and receiving antennas placed inside a metal casing with slits. Transmit antennas are excited simultaneously with a high-frequency harmonic signal with different frequencies f₁…f_n. Signals accepted by receiving antennas are amplified and subjected to a multi-channel narrowband filtration with subsequent readings accumulation and isolating the amplitude and phase information.

EFFECT: increased reliability and accuracy in determining electrical conductivity of drilled formations and as a result, increased efficiency of drilling tool control during drilling of deviated and horizontal wells.

3 cl, 3 dwg