METHOD FOR ELECTROMAGNETIC INSPECTION OF MECHANICAL STRENGTH OF UNION JOINTS IN WELLS Russian patent published in 2012 - IPC G01N27/00 

FIELD: physics.

SUBSTANCE: union joint which is not accessible for direct inspection is placed in an alternating magnetic field with fixed frequency of the first parametric inductive transducer connected into a series LC oscillatory circuit, and an accessible union joint known to be operating well is placed in an alternating magnetic field with fixed frequency of the second parametric inductive transducer connected into a series LC oscillatory circuit and connected on a differential circuit to the first parametric inductive transducer of the LC oscillatory circuit, wherein capacitance of the capacitor of the second series LC oscillatory circuit is such that the reactance of the capacitor is equal to twice the reactance of the inductive transducer, i.e., X_C=2X_L, and the capacitance of the capacitor of the second LC oscillatory circuit is such that the reactance of the capacitor is equal to the reactance of the inductive transducer, i.e., X_C=X_L and the operating condition of the union joint is determined by deviation of voltage difference from the zero value at the first and second LC oscillatory circuits.

EFFECT: broader capabilities of using the method.

3 dwg