| 摘要 |
FIELD: equipment measuring electric properties of rocks in oil and gas wells. SUBSTANCE: gear for electromagnetic logging probing includes probes, geometrically and electrodynamically identical, composed of generator and measurement coils, multiplexer of generator circuits, power amplifiers, amplifiers-converters, heterodyne, commutator, amplifiers-limiters of intermediate frequency, phase meter, automatic control unit, telemetering system. Generator coils are connected to outputs of power amplifiers, measurement coils are linked to inputs of amplifiers- converters, actuating lines of commutator are placed between outputs of amplifiers-converters and inputs of amplifiers-limiters of intermediate frequency which outputs are connected to inputs of phase meter which output is coupled to input of telemetering system. Output of system is connected to communication line of ground recording equipment. Outputs of automatic control unit are connected to controlling inputs of multiplexer of generator circuits and commutator. Factor of geometrical similarity lies within limits from 1.1 to 1.5. Gear is supplemented with reference generator, electrode, signal converter and electromagnetic filter. Heterodyne of gear can be returned. Commutator is manufactured in the form of multiplexer of measurement circuits, phase meter has broad band. Multiplexer is connected with actuating lines between output of automatic control unit and inputs of power amplifiers. Output of retunable heterodyne is connected to inputs of amplifiers-converters. Electrode is coupled to input of signal converter which output is linked to inputs of telemetering system. Output of reference generator is connected to input of automatic control unit which outputs are connected to inputs of retunable heterodyne, broadband phase meter and telemetering system. Electromagnetic filter is placed between generator and measurement coils. Electromagnetic filter is placed between generator and measurement coils. Amplifiers-converters and multiplexer of measurement circuits are located between electromagnetic filter and measurement coils which number k lies within bounds from 3 to 2n, where n is number of generator coils. Factor of electrodynamic similarity is kept within limits (0,5-15)•10Hz.sq.m. EFFECT: simplified design of gear making it possible to enhance productivity and accuracy of measurement of electric parameters of inhomogeneities in strata-collectors. |
