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Method and device for measuring steel tube residual wall thickness magnetization pulse eddy current

A technology of pulsed eddy current and measurement method, which is applied in the direction of electromagnetic measuring device, measuring device, electric/magnetic thickness measurement, etc. It can solve the problems of difficulty in measuring the thickness of pipelines in service, insufficient stability and reliability, etc., and meet the requirements of clean state Low, simple structure, strong penetrating effect

Inactive Publication Date: 2017-01-04
WUHAN HUAYUYIMU TESTING EQUIP CO LTD
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Problems solved by technology

Electromagnetic ultrasonic thickness measurement can realize non-contact small lift-off measurement, but its stability and reliability are insufficient, and it is difficult to realize the thickness measurement of in-service pipelines

Method used

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  • Method and device for measuring steel tube residual wall thickness magnetization pulse eddy current
  • Method and device for measuring steel tube residual wall thickness magnetization pulse eddy current
  • Method and device for measuring steel tube residual wall thickness magnetization pulse eddy current

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Embodiment Construction

[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0027] The invention discloses a magnetization pulsed eddy current measurement method for the remaining wall thickness of a steel pipe, which comprises the following steps:

[0028] S1: Magnetize the inspected steel pipe 8 locally uniformly and reach a certain strength;

[0029] S2: The centerline of the exciting coil 31 and the magnetically sensitive direction of the receiving magnetic sensitive element 32 are facing the normal direction of the surface of the steel pipe 8, and the exciting coil 31 and the receiving magnetic sensitive element 32 form a pulsed eddy current measuring probe to sense the change of the magnetic permeability of the surface layer of the steel pipe 8;

[0030] S3: The plane of multiple puls...

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Abstract

The invention relates to a method and device for measuring steel tube residual wall thickness magnetization pulse eddy current. After a steel tube is magnetized in the state that total magnetic flux is not changed, magnetic induction intensity in the steel tube is greater than magnetic induction intensity corresponding to a maximum permeability point; change of the magnetic induction intensity in a tube body at the position is produced due to change of a local steel tube wall thickness, then permeability of the tube body of the part is changed, the change expresses on the surface layer of the steel tube, and change of measurement waveforms is caused; and arrayed pulse eddy current measuring probes which are perpendicular to the axial lead of the steel tube are uniformly arranged in the peripheral direction at an angle of 360 degrees, and exciting coils of the pulse eddy current measuring probes and the center line of a receiving magnetic sensitive element face the surface of the steel tube in the normal direction. Therefore, when the local wall thickness of the steel tube is changed, the amplitude of outputted pulse eddy current detection signals is changed, the amplitude of the signals is corrected after ovality is measured, and non-contact measurement is realized.

Description

technical field [0001] The invention relates to the field of non-destructive testing, in particular to a method and device for measuring the remaining wall thickness of steel pipes with magnetized pulsed eddy currents. Background technique [0002] Steel pipe operation equipment is widely used in oil and gas field workover, drilling, completion, logging and other operations. The thinning of the steel pipe wall will reduce the pressure on the steel pipe during the operation of multiple oil and gas wells, which will easily cause downhole accidents. Therefore, the wall thickness parameters of steel pipes are very important. Commonly used ultrasonic thickness measurement methods require couplant and are slow. Thickness measurement in high-speed motion is a difficult problem for steel pipe thickness measurement. Thickness measurement in non-contact and high-speed motion is a difficult problem for steel pipe thickness measurement. Electromagnetic ultrasonic thickness measureme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/06
CPCG01B7/10
Inventor 康宜华张继楷
Owner WUHAN HUAYUYIMU TESTING EQUIP CO LTD
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