AN APPARATUS FOR MULTISENSOR ELECTROMAGNETIC DEFECTOSCOPY AND INTEGRITY MONITORING OF WELL CASINGS

The invention relates to geophysics and can be used for monitoring the condition of casing strings, production tubing and other tubing in oil and gas wells. The essence of the invention is a device for inspecting well casing strings for flaws, comprising a unit for generating an electromagnetic field, a unit of receiving sensors, and a control and data recording and analysis unit, said units being secured in a housing, wherein: the unit for generating an electromagnetic field for creating excitation pulses of a given amplitude and duration is comprised of a generating coil having a core made of a material with a high magnetic permeability; the unit of receiving sensors comprises an integrated measuring coil and N radial measuring coils arranged around the winding of the generating coil, wherein each measuring coil has a U-shaped core, the poles of which are oriented perpendicular to the surface of the casing undergoing inspection, and the axis of symmetry of the winding is parallel to the axis of symmetry of the winding of the generating coil; the control and data recording and analysis unit includes N operational amplifiers, with variable amplification coefficients, and analog-to-digital converters which transmit signals from the measuring coils to a microcontroller that is connected to a computer with software for the analysis of casing flaws, wherein the microcontroller controls the unit for generating an electromagnetic field as well as the amplification coefficients and the analog-to-digital converters. The technical result is an increase in the information content of measurements relative to both the length of the tubing undergoing inspection and the azimuth, and also an increase in the accuracy of flaw detection. L'invention concerne la géophysique et peut être utilisée poru contrôler l'état technique des colonnes de tubes, des tuyaux de pompage et d'autres colonnes de puits de pétrole ou de gaz. L'invention consiste en un dispositif pour la détection de défauts des colonnes de tubage d'un puits comprenant une unité de génération de champ électromagnétique, une unité de capteurs de réception et une unité de contrôle d'enregistrement et d'analyse de données, qui sont montés à demeure dans un boîtier, l'unité de génération de champ électromagnétique pour générer des impulsions d'excitation d'une amplitude et d'une durée données étant une bobine génératrice avec un noyau en un matériau à haute perméabilité magnétique, l'unité de capteurs de réception c