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Drilling tool well head magnetic flux leakage detection apparatus and method thereof

A technology of magnetic flux leakage detection and drilling tools, applied in the direction of material magnetic variables, etc., can solve the problems of difficulty in popularization and application, high cost, and inability to install, and achieve the effects of prolonging life, reducing impact, and reducing misjudgment

Active Publication Date: 2015-03-04
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, the existing device represented by this patent document cannot be installed at the wellhead, and secondly, it is not necessary to distinguish the vertical and horizontal directions of the drilling tool defect in the wellhead inspection, and only needs to determine its quality level, that is, the size of the defect That is enough, so the cost of this type of device is relatively high, and it is difficult to popularize and apply

Method used

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  • Drilling tool well head magnetic flux leakage detection apparatus and method thereof
  • Drilling tool well head magnetic flux leakage detection apparatus and method thereof
  • Drilling tool well head magnetic flux leakage detection apparatus and method thereof

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Embodiment 1

[0040] Refer to the attached figure 1, the invention discloses a drilling tool wellhead magnetic flux leakage detection device, which is characterized in that it includes a magnetizing coil, a detection wheel, a demagnetization coil, a signal conditioning circuit, an A / D converter and a host computer, wherein: the magnetizing coil is At least two drill tools are arranged in the magnetizing coil, and the demagnetizing coil is arranged on one side of the magnetizing coil. The magnetic field of the demagnetizing coil is opposite to that of the magnetizing coil. The magnetic flux leakage signal processed by the signal conditioning circuit is processed by the A / D converter and then input to the host computer.

Embodiment 2

[0042] Refer to the attached Figure 1-4 , One of the best embodiments of the present invention is that it includes a magnetizing coil, a probe wheel, a demagnetizing coil, a signal conditioning circuit, an A / D converter and a host computer. The magnetizing coil is divided into upper and lower two, and the current excitation is provided by the DC excitation power supply, and the surface of the drilling tool is strongly magnetized. The probe wheel includes a probe wheel body, a probe wheel roller, a surface soft magnet, a bottom soft magnet, a magnetic sensitive element group 1, and a magnetic sensitive element group 2. The probe wheel rollers are installed on both sides of the probe body and can rotate freely, and rotate with the drilling tool when working. The surface soft magnet and the bottom soft magnet clamp the magnetic sensitive element and fix it in the probe body as a whole. The probe wheel clamps the probe in the middle to form a magnetic vacuum shield, which reduc...

Embodiment 3

[0044] As another best embodiment of the present invention, the drilling tool wellhead magnetic flux leakage detection method provided is as follows:

[0045] Step 1: Hold the automatic slip card under the drill string collar, and then hoist it in the turntable;

[0046] Step 2: Install the device of the present invention on the automatic slips, and place the detection wheel close to the surface of the drilling tool.

[0047] Step 3: Carry out strong axial magnetization on the drilling tool through the two magnetizing coils of the device of the present invention to form an excitation field for leakage magnetic fields in all directions on the surface of the drilling tool;

[0048] Step 4: Use the magnetic sensitive component to pick up the leakage magnetic field on the surface of the drilling tool;

[0049] Step 5: The magnetic sensor group induces a voltage in the magnetic field on the surface of the drilling tool. When the voltage has a sudden change, there is a defect in th...

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Abstract

The invention discloses a drilling tool well head magnetic flux leakage detection apparatus and a method thereof, the apparatus comprises magnetizing coils, a detecting wheel, a demagnetization coil, a signal conditioning circuit, an A / D converter and an upper computer, wherein the magnetizing coil are at least two, a drilling tool is provided in the magnetizing coil, the demagnetization coil is provided at one side of the magnetizing coil, the magnetic fields of the demagnetization coil and the magnetizing coil are opposite, a magnetic flux leakage signal output channel of the detecting wheel is connected with the signal conditioning circuit, the magnetic flux leakage signal processed by the signal conditioning circuit is received, and input to the upper computer through the A / D converter after processing. According to the invention, the invention overcomes the defect that the prior art enables operation at the detection field far from a drilling crew on site, and solves the problem of well head installation of magnetic flux leakage detection apparatus. The apparatus has the advantages of simple structure and low production cost, and is convenient for popularization and application.

Description

technical field [0001] The invention relates to the technical field of design and manufacture of oil drilling tool wellhead non-destructive testing instruments, in particular to a drilling tool wellhead magnetic flux leakage detection device and method. Background technique [0002] Drilling tools inspection usually adopts methods such as magnetic flux leakage, ultrasonic, eddy current and naked eye observation at the station, while the automatic flaw detection of drilling tools in the station usually adopts magnetic flux leakage detection. At present, there is no practical automatic non-destructive testing method for drilling tools at the wellhead of drilling rigs with the device. [0003] In the existing automatic non-destructive testing technology for drilling tools in field stations, automatic magnetic flux leakage detection has become a detection method with a higher degree of automation. Strong magnetization magnetic flux leakage detection method and device. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/83
Inventor 谭刚强王豫张祥来何莎喻建胜许斌
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD