Method for measuring magnetic properties of non-magnetic wear-resistant strip

Abstract

The application relates to a kind of non-magnetic wear-resistant band magnetic performance measurement methods, which can fully cover the magnetic field distribution measurement surface of non-magnetic wear-resistant band, accurately measure the magnetic performance parameters of non-magnetic wear-resistant band and ensure the processing quality of non-magnetic wear-resistant band.Through a magnetic induction intensity sensor probe, the magnetic induction intensity data on the corresponding inner hole center axis are collected by measuring twice in the wear-resistant ring before and after the processing procedure of non-magnetic wear-resistant ring, and the two groups of data are compared to exclude the influence of magnetic induction intensity of non-magnetic wear-resistant ring (i.e. wear-resistant band substrate), and the magnetic induction intensity data distribution on the corresponding wear-resistant band axis is obtained. By using the measurement method, the magnetic field distribution measurement surface of non-magnetic wear-resistant band can be fully covered, the magnetic performance parameters of non-magnetic wear-resistant band can be accurately measured, and the processing quality of non-magnetic wear-resistant band is ensured.

Description

Technical Field

[0001] This invention belongs to the field of magnetic property testing technology for non-magnetic drill bits, specifically relating to a method for measuring the magnetic properties of non-magnetic wear-resistant belts that can fully cover the magnetic field distribution measurement surface, accurately measure the magnetic property parameters of non-magnetic wear-resistant belts, and ensure the processing quality of non-magnetic wear-resistant belts. Background Technology

[0002] The magnetic performance indicators of the wear-resistant strip of non-magnetic drill pipe are based on Clause 6.4.2 of the "SY / T 5144-2013 Petroleum and Natural Gas Industry Standard of the People's Republic of China—Drill Collar Standard," which stipulates that the maximum deviation of the non-magnetic drill collar from the uniform magnetic field should not exceed ±0.05μT. The test method for magnetic performance specified in Clause 6.4.2 is as follows: the drill string is placed in a north-south direction, the probe is stationary, and the drill collar under test is moved north-south, allowing the probe to measure the magnetic flux density gradient ΔB value at any point 100mm apart along the inner hole. To protect the non-magnetic drill pipe from wear and thus improve the service life of the non-magnetic drill string, a wear-resistant ring is fitted onto the cylindrical surface of the non-magnetic drill string to enhance its wear resistance. According to Clause 5.1 of the "SY / T 6948-2013 Petroleum and Natural Gas Industry Standard of the People's Republic of China—Petroleum Drilling Tool Wear-Resistant Strip Standard," the maximum size of the wear-resistant strip is within (76~102) mm. For non-magnetic wear-resistant rings with widths all below 102mm, measuring the magnetic flux density gradient ΔB value at any point 100mm apart in the inner hole of the non-magnetic drill bit cannot fully reflect the uniform distribution of magnetic flux density in the wear-resistant belt and the influence of magnetic flux density on the corresponding wear-resistant belt axis. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a method for measuring the magnetic properties of a non-magnetic wear-resistant belt that can comprehensively reflect the uniform distribution of magnetic field strength and the influence of magnetic field strength on the corresponding wear-resistant belt axis. The method uses a magnetic field strength sensor probe to measure the magnetic field strength twice inside the wear-resistant ring before and after the non-magnetic wear-resistant ring cladding process, collecting magnetic field strength data on the corresponding inner hole center axis. By comparing the two sets of data and eliminating the influence of the magnetic field strength of the non-magnetic wear-resistant ring substrate, the magnetic field strength data distribution on the corresponding wear-resistant belt axis is obtained.

[0004] The objective of this invention is achieved as follows: A method for measuring the magnetic properties of a non-magnetic wear-resistant belt involves using a magnetic induction intensity sensor probe to measure the magnetic induction intensity twice, before and after the non-magnetic wear-resistant belt cladding process, within the non-magnetic wear-resistant ring. Magnetic induction intensity data are collected along the corresponding inner hole center axis. The two sets of data are compared to eliminate the influence of the non-magnetic wear-resistant ring's magnetic induction intensity, thus obtaining the magnetic induction intensity data distribution along the corresponding wear-resistant belt axis. The specific measurement steps are as follows:

[0005] Step 1) First, place the central axis of the non-magnetic wear-resistant ring substrate in the north-south direction. Pass the magnetic induction intensity sensor probe through the central axis of the substrate hole corresponding to the wear-resistant belt position, and control the speed at 20mm / min. Record the magnetic induction intensity data of each point on the central axis of the substrate hole corresponding to the wear-resistant belt position, and draw a magnetic field distribution curve based on the collected data.

[0006] Step 2) After completing the non-magnetic wear-resistant ring substrate cladding and wear-resistant belt process, place the non-magnetic wear-resistant ring in the north-south direction of the central axis. Using a magnetic induction intensity sensor probe, pass through the non-magnetic wear-resistant ring from the central axis, along the same movement trajectory as in Step 1), with the speed controlled at 20 mm / min, measure the magnetic induction intensity data on the corresponding central axis of the wear-resistant ring, and collect the data to draw a magnetic field distribution curve.

[0007] Step 3) Compare the two sets of data, eliminate the influence of the magnetic induction intensity of the wear-resistant ring matrix, and obtain the magnetic induction intensity data distribution on the central axis of the wear-resistant ring corresponding to the wear-resistant belt, which is represented by a magnetic field distribution curve.

[0008] The technical specifications of the magnetic induction intensity sensor probe are as follows: measurement range: -90μT to +90μT, magnetic field noise: 0.2nT, drift: <2nT / min, linearity: <0.1%, structure is a cylinder encapsulated with non-magnetic material, and the test platform (3) is made of non-magnetic material.

[0009] Compared with the prior art, the present invention has the following advantages: the magnetic field distribution measurement surface of the non-magnetic wear-resistant belt is fully covered, the magnetic performance parameters of the non-magnetic wear-resistant belt are accurately measured, and the processing quality of the non-magnetic wear-resistant belt is guaranteed. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the test for the non-magnetic wear-resistant ring of the present invention.

[0011] Figure 2 The graph shows the magnetic induction intensity of the non-magnetic wear-resistant ring matrix.

[0012] Figure 3 This is a graph showing the magnetic induction intensity of a non-magnetic wear-resistant ring (clad wear-resistant belt).

[0013] Figure 4 This is a graph showing the magnetic induction intensity of the wear-resistant belt.

[0014] 1 is a magnetic induction intensity sensor probe, 2 is a non-magnetic wear-resistant ring, and 3 is a test platform. Implementation

[0015] Example 1: A method for measuring the magnetic properties of a non-magnetic wear-resistant band, comprising the following steps:

[0016] Step 1) Select magnetic induction intensity sensor probe 1. Probe 1 technical specifications: measurement range: -90μT~+90μT, magnetic field noise: 0.2nT, drift: <2nT / min, linearity: <0.1%, structure is a cylinder encapsulated with non-magnetic material;

[0017] The central axis of the substrate of the non-magnetic wear-resistant ring 2 is placed on the test platform 3 in a north-south direction. The test platform 3 is made of non-magnetic material. The magnetic induction intensity sensor probe 1 passes through the central axis of the substrate hole corresponding to the wear-resistant belt position, and the speed is controlled at 20mm / min. The magnetic induction intensity data of each point on the central axis of the substrate hole corresponding to the wear-resistant belt position is recorded, and the collected data is used to draw a magnetic field distribution curve.

[0018] Step 2) After completing the non-magnetic wear-resistant ring substrate cladding and wear-resistant tape process, place the non-magnetic wear-resistant ring on the test platform 3 in the north-south direction of the central axis. Use the magnetic induction intensity sensor probe 1 to pass through the non-magnetic wear-resistant ring along the central axis at a speed controlled at 20 mm / min. Measure the magnetic induction intensity data on the corresponding central axis of the wear-resistant ring and collect the data to draw a magnetic field distribution curve.

[0019] Step 3) Compare the two sets of data, eliminate the influence of the magnetic induction intensity of the wear-resistant ring matrix, and obtain the magnetic induction intensity data distribution on the central axis of the wear-resistant ring corresponding to the wear-resistant belt, which is represented by a magnetic field distribution curve.

Claims

1. A method for measuring the magnetic properties of a non-magnetic wear-resistant belt, comprising measuring the magnetic induction intensity data on the corresponding inner hole center axis twice, before and after the non-magnetic wear-resistant ring (2) is clad with the wear-resistant belt using a magnetic induction intensity sensor probe (1), collecting magnetic induction intensity data on the corresponding inner hole center axis, comparing the two sets of data, eliminating the influence of the magnetic induction intensity of the non-magnetic wear-resistant ring (2), and obtaining the magnetic induction intensity data distribution on the corresponding wear-resistant belt axis, characterized in that: Follow these steps: Step 1) First, place the central axis of the non-magnetic wear-resistant ring substrate in the north-south direction, and pass the magnetic induction intensity sensor probe (1) through the central axis of the substrate hole corresponding to the wear-resistant belt position. Control the speed at 20mm / min, record the magnetic induction intensity data of each point on the central axis of the substrate hole corresponding to the wear-resistant belt position, and draw the magnetic field distribution curve based on the collected data. Step 2) After completing the non-magnetic wear-resistant ring substrate cladding and wear-resistant belt process, place the non-magnetic wear-resistant ring (2) in the north-south direction of the central axis. Using the magnetic induction intensity sensor probe (1), pass through the non-magnetic wear-resistant ring from the central axis, along the same motion trajectory as in Step 1), with the speed controlled at 20 mm / min, measure the magnetic induction intensity data on the corresponding central axis of the wear-resistant ring, collect the data and draw the magnetic field distribution curve. Step 3) Compare the two sets of data, eliminate the influence of the magnetic induction intensity of the wear-resistant ring matrix, and obtain the magnetic induction intensity data distribution on the central axis of the wear-resistant ring corresponding to the wear-resistant belt, which is represented by a magnetic field distribution curve.

2. The method of claim 1, wherein the method further comprises: The technical specifications of the magnetic induction intensity sensor probe (1) are as follows: measurement range: -90μT to +90μT, magnetic field noise: 0.2nT, drift: < 2nT / min, linearity: <0.1%, structure is a cylinder encapsulated with non-magnetic material, and the test platform (3) is made of non-magnetic material. ​

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