FIELD: flaw detectors, possible use for monitoring technical condition of steel columns in oil-gas wells.
SUBSTANCE: well flaw detector contains current commutator, signal and current inductance coils, main and backup current commutators, preliminarily twin operation amplifiers, signal transformer, generator of service signals, power amplifier, control block, timer, amplification coefficient commutator, device for selection and storage of data, synchronization device, connected to ground digital registration device through geophysical cable. Parameters of core and number of coils of signaling and current inductance coils are selected on basis of maximal researched diameter of steel pipes and on basis of detailing of measurements (transient process time is supposed to be less than time between measurement quanta at given speed of movement of electromagnetic flaw detector inside the well).
EFFECT: decreased distortion of shape of transient process of fading of magnetic field.
1 dwg
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