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Device and method for calibrating magnetic interference of drilling tool

A magnetic interference and drilling tool technology, applied in the direction of measuring devices, instruments, etc., can solve the problem that the directional sensor is affected by the magnetic interference of drilling tools, and achieve the effect of optimizing the drilling tool assembly, improving the measurement accuracy and reducing the length.

Active Publication Date: 2020-12-15
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a device and method for calibrating the magnetic interference of drilling tools, which is used to solve the problem that the orientation sensor is affected by the magnetic interference of drilling tools

Method used

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  • Device and method for calibrating magnetic interference of drilling tool
  • Device and method for calibrating magnetic interference of drilling tool
  • Device and method for calibrating magnetic interference of drilling tool

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Experimental program
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Embodiment

[0040] A method for calibrating drilling tool magnetic interference, comprising the following steps:

[0041] (1) if figure 1 As shown, adjust the magnetic field value in the three-axis Helmholtz coil 1, adjust the three-axis Helmholtz coil according to the ambient magnetic field strength at the center of the coil, and emit a vector magnetic field X B , Y B ,Z B , to offset the external magnetic field; after the coil center magnetic field value is "0", adjust the vector magnetic field Z B Generate an additional 50μT magnetic field as the standard unit magnetic field;

[0042] (2) if figure 2 with image 3 As shown, the drilling tool 3 is fixed inside the triaxial Helmholtz coil 1 by calibrating the slide rail on the stand 2, so that the magnetic sensor B of the orientation sensor 4 inside the non-magnetic drill collar 301 x 401、B y 402 and B z 403 Near the center of the triaxial Helmholtz coil 1 within 40cm×40cm×40cm; relative to B x 401 and B y 402, the disturbance...

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Abstract

The invention discloses a device and a method for calibrating magnetic interference of a drilling tool. The method comprises the following steps: simulating the calibration rotation of a fluxgate measurement axis of a directional sensor through the rotation of a unit intensity artificial magnetic field in space, determining the interference magnetic field intensity of a measurement point of the directional sensor in a BHA magnetic interference environment, and calibrating a measurement value of the fluxgate of the directional sensor; and determining the intensity of the BHA interference magnetic field by comparing the inherent calibration coefficients of the directional sensor. In field application, the directional sensor eliminates the influence of a BHA interference magnetic field through modeling, and improves the measurement precision of engineering parameters, thereby reducing the cost of drilling construction, and improving the target rate.

Description

【Technical field】 [0001] The invention belongs to the field of calibrating and calibrating downhole orientation sensors in the petroleum industry, in particular to calibrating the magnetization interference of downhole drilling tools, in particular to a device and method for calibrating the magnetic interference of drilling tools. 【Background technique】 [0002] In drilling engineering, in order to precisely control the wellbore trajectory, directional sensors based on three accelerometers and three fluxgate structures are usually used to measure the engineering parameters of the wellbore. When the orientation sensor measures the azimuth, it needs a fluxgate to measure the vector strength of the earth's magnetic field. The earth's magnetic field is a weak magnetic field, which is easily affected by other magnetic interference sources. [0003] At the drilling construction site, the orientation sensor is usually installed in the non-magnetic drill collar of the bottom hole a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00
CPCG01C25/00Y02A90/30
Inventor 孟卓然陈鹏李童朱军宋永杨吴瑶陈国兴范思航杨皓成淑云吴杰
Owner BC P INC CHINA NAT PETROLEUM CORP
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