Method and Device for Multi-Sensor Electromagnetic Defectoscopy of Well Casings

摘要

A group of inventions related to geophysical well logging, in particular to magnetic imaging defectoscopy of well casings including magnetised ones, that can be used to identify and classify defects in production and intermediate casing and tubing strings in oil and gas wells. An electromagnetic multi-sensor defectoscope for surveying casing pipes containing a source of the electromagnetic field in the form of a central exciter coil designed to transmit current pulses from a current pulse generator, a system of measuring elements placed on bow springs to be forced against the inner surface of a casing pipe, and a unit for signal recording, control and data processing connected to the system of measuring elements through communication lines. A method of multi-sensor electromagnetic defectoscopy for surveying casing pipes.

主权项

1. An electromagnetic multi-sensor defectoscope for surveying casing pipes containing a source of the electromagnetic field in the form of a central exciter coil designed to transmit current pulses from a current pulse generator, a system of measuring elements placed on bow springs to be forced against the inner surface of a casing pipe, and a unit for signal recording, control and data processing connected to the system of measuring elements through communication lines, wherein the system of measuring elements, designed to record signals proportional to the longitudinal component of the electromagnetic field, consists of at least three compensated sensors, each equidistant from one another along the circumference of the cross-section of a casing pipe so that each sensor ensures reliable detection of defects within its surveyed section.