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An azimuth drilling tool magnetic interference correction method and correction system

A correction method and magnetic interference technology, applied in the measurement angle, climate sustainability, instruments, etc., can solve the problems of lack of drilling tool magnetic interference correction system, inability to perform real-time correction of azimuth angle, affecting directional well measurement work, etc. Reasonable calibration results, improved accuracy, and reduced magnetic interference errors

Active Publication Date: 2022-07-12
CNPC BOHAI DRILLING ENG +1
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AI Technical Summary

Problems solved by technology

In the field construction, there is a lack of a universal and independently operating drilling tool magnetic interference correction system. Since various correction systems cannot be used universally, the azimuth angle cannot be corrected in real time, which seriously affects the measurement work of directional wells

Method used

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  • An azimuth drilling tool magnetic interference correction method and correction system
  • An azimuth drilling tool magnetic interference correction method and correction system
  • An azimuth drilling tool magnetic interference correction method and correction system

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Embodiment Construction

[0030] The present invention is described in further detail below in conjunction with the accompanying drawings and specific embodiments:

[0031] like Figure 1 to Figure 7 As shown, the magnetic interference correction method of the azimuth drilling tool of the present invention includes:

[0032] Step S101, collecting downhole static inclination data, three-axis accelerometer measurement values ​​Gx, Gy, Gz; three-axis fluxgate measurement values ​​Bx, By, Bz; it is specified that the y-axis is the high-side direction of the probe tube, and the z-axis is the probe tube Axial direction; geological parameters of the area where the construction well is located, the actual magnetic field intensity Btotal, the geomagnetic dip angle Dip and its error.

[0033] Step S102, determine whether there is radial magnetic interference; calculate the radial error of the drilling tool in real time, and obtain a corresponding error curve,

[0034] Step S103, when radial magnetic interferen...

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Abstract

The invention discloses a magnetic interference correction method and correction system for an azimuth drilling tool. The radial magnetic interference module performs radial magnetic interference correction; calculates the axial magnetic interference through the axial magnetic interference module, and performs axial magnetic interference correction; carries out error analysis; displays the correction results and stores them. The beneficial effect is that, since the calculation of the axial direction correction of the azimuth angle is carried out by the mathematical method of cyclic iteration, and the correction calculation of the radial direction of the azimuth angle is carried out, the magnetic interference correction of the real-time azimuth angle is realized, the correction efficiency is improved, and the azimuth angle is reduced. Drilling tool magnetic interference error. The sperry‑sun short drill collar measurement technology is provided as a reference for the calculation of axial magnetic interference, and the correction results are more reasonable; the arc tangent calculation in the azimuth angle calculation adopts the Taylor series expansion calculation, which improves the accuracy of the calculation.

Description

technical field [0001] The invention relates to wireless while drilling equipment in the oil and natural gas drilling equipment technology; in particular, to a correction method and correction system for magnetic interference of azimuth drilling tools. Background technique [0002] At present, there are various magnetic interferences in the measurement of the azimuth angle of the wireless LWD instrument. Among them, the magnetic interference of drilling tools has a great influence on the azimuth angle. Drilling tool magnetic interference includes axial magnetic interference and radial magnetic interference. In the field construction, there is a lack of a universal and independent drilling tool magnetic interference correction system. Since various correction systems cannot be universal, the azimuth angle cannot be corrected in real time, which seriously affects the measurement of directional wells. SUMMARY OF THE INVENTION [0003] The technical problem to be solved by t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C25/00G01C1/00
CPCG01C1/00G01C25/00Y02A90/30
Inventor 宋晓健王大宁穴强宋晓晖董晨曦李猛杨国光毕雨萌马洪彦
Owner CNPC BOHAI DRILLING ENG
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