ELECTROMAGNETIC WELL FLAW DETECTOR (VERSIONS) Russian patent published in 2017 - IPC G01N27/90 E21B47/12 G01B7/02 

FIELD: measuring equipment.

SUBSTANCE: electromagnetic well flaw detector comprises a generator inductance coils, measuring inductance coils, and additional measuring inductance coils spaced apart from the generator coil, an electronics unit, wherein the additional measuring inductance coils are removed from the generator inductance coil at a distance providing the optimum working zone of influence of the generator inductance coil on them, which is selected from the condition from 0.01 to 2L, and are spaced apart along the device axis at a distance selected from the conditions of 0.01 to 2L, where L is the length of the main probe. Moreover, each additional measuring inductance coil in the amount of one or more pieces is mounted on a separate magnetic core.

EFFECT: improving the resolving power of a flaw detector, increasing the sensitivity to small-size flaws and determining their accuracy due to selecting the optimal position distance of the measuring coil from the generator coil to provide the working zone of influence of the generator coil to the measuring coil.

2 cl, 3 dwg