High-precision downhole electromagnetic thickness-measuring caliper

Abstract

The invention relates to a high-precision downhole electromagnetic thickness-measuring caliper. The high-precision downhole electromagnetic thickness-measuring caliper comprises a magnetic protective sleeve, a coil component, a control unit, a thickness measuring unit, a fixing component and a thickness measuring drive unit, wherein the coil component and the control unit are positioned in the magnetic protective sleeve; the thickness measuring unit is arranged on the fixing component; the fixing component is connected with the magnetic protective sleeve and the thickness measuring drive unit; the thickness measuring unit comprises a plurality of thickness measuring sensors; the coil component comprises a high-frequency electromagnetic coil and an intermediate-frequency electromagnetic coil; the high-frequency electromagnetic coil is positioned above the intermediate-frequency electromagnetic coil; the intermediate-frequency electromagnetic coil is positioned above the control unit; and the control unit is connected with the thickness measuring unit through the fixing component. The high-precision downhole electromagnetic thickness-measuring caliper solves the technical problems that the conventional electromagnetic thickness-measuring caliper can only perform point-to-point transmission and reception, and can only be used for qualitative analysis, and the measured thickness is a relative value. The high-precision downhole electromagnetic thickness-measuring caliper has high resolution and extremely high precision and can calculate absolute wall thickness of different sectors in the process of measuring borehole diameters.

Description

technical field [0001] The invention relates to a well condition measuring instrument, in particular to a high-precision downhole electromagnetic thickness measuring caliper in oil wells in the petroleum well logging industry. Background technique [0002] Electromagnetic testing can determine casing thickness, borehole diameter, cracks, deformation, dislocation, corrosion of inner and outer walls, perforation quality, and defects of multi-layer strings. The electromagnetic detector is a non-destructive and non-contact instrument, which is not affected by the liquid in the well, the scale of the casing, the wax deposition and the attachment on the well wall, and the measurement accuracy is high. Due to the unique advantages of electromagnetic detection, it has become one of the most widely used casing damage detection technologies. [0003] There are many instruments at home and abroad that use the electromagnetic method to detect the thickness of the casing, which can basi...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the existing electromagnetic thickness measuring caliper has only one shot and one receiving, can only be used as a qualitative analysis, and the measured thickness is a relative value, the present invention provides a high-precision downhole electromagnetic thickness measuring caliper, which In the process of measuring borehole diameter, it has high resolution and high precision, and can calculate the absolute wall thickness of different sectors according to the calculated electromagnetic characteristics of casing

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