Patent ID: 11867662
Assignee: TGT DMCC
Field: Measurement (Instruments)
Classification: CPC E  G | IPC E  G

Claim 0:
1. An apparatus for defectoscopy of downhole casings, comprising:
an electromagnetic field generator configured to generate an excitation pulse of a specified amplitude and duration, electromagnetic field generator being an exciter coil containing a core made of a high magnetic permeability material:
a pick-up sensor comprising an integral pick-up coil and a plurality of radial pick-up coils, wherein the plurality of radial pick-up coils are mounted between opposing end portions of the exciter coil and around the core, each of the radial pick-up coils having a U-shaped core with poles directed perpendicularly away form the core, wherein center lines of the integral pick-up coil and the plurality of radial pick-up coils are aligned with a center line of the exciter coil, wherein turns of the integral pick-up coil and the exciter coil alternate along a longitudinal axis of the core such that at least one section of the integral pick-up coil is located between two sections of the exciter coil and vice versa;
a controller comprising a plurality of operational amplifiers with variable amplification factors and analog-to-digital converters (ADCs), wherein the controller is configured to transmit signals from the radial pick-up coils to a computer with casing defect analysis software installed thereon, the computer being configured to control the electromagnetic field generator, the amplification factors, and the ADCs,
wherein the electromagnetic field generator, the pick-up sensor, and the controller are all mounted in a housing.