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Correction method and correction system of magnetic interference of azimuth angle drilling tool

A correction method and magnetic interference technology, applied in the direction of measurement angle, climate sustainability, instruments, etc., can solve the problems of lack of drilling tool magnetic interference correction system, azimuth angle cannot be corrected in real time, and affect the measurement work of directional wells, etc., to achieve Reasonable calibration results, improved accuracy, and reduced magnetic interference errors

Active Publication Date: 2018-09-28
CNPC BOHAI DRILLING ENG +1
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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

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  • Correction method and correction system of magnetic interference of azimuth angle drilling tool
  • Correction method and correction system of magnetic interference of azimuth angle drilling tool
  • Correction method and correction system of magnetic interference of azimuth angle drilling tool

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0031] Such as Figure 1 to Figure 7 As shown, the method for correcting the magnetic interference of the azimuth drilling tool of the present invention includes,

[0032] Step S101, collect downhole static inclinometer data, three-axis accelerometer measurement values ​​Gx, Gy, Gz; three-axis fluxgate measurement values ​​Bx, By, Bz; stipulate that the y-axis is the direction of the high side 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, actual magnetic field strength Btotal, geomagnetic inclination 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 the corresponding error curve,

[0034] Step S103, when there is radial magnetic in...

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Abstract

The invention discloses a correction method and a correction system of magnetic interference of an azimuth angle drilling tool. The correction method comprises the steps of acquiring downhole static survey data, and a geological parameter of an area where a construction well is located, judging whether radial magnetic interference exists, performing radial magnetic interference correction througha radial magnetic interference module if so, calculating axial magnetic interference through an axial magnetic interference module, performing axial magnetic interference correction and error analysis, and displaying and storing a correction result. The method and the system have the benefits that since a loop iteration mathematical method is used for calculation of axial correction and radial correction of an azimuth angle, the real-time magnetic interference correction of the azimuth angle is achieved; the correction efficiency is improved; and a magnetic interference error of the azimuth angle drilling tool is reduced. A sperry-sun short drill collar measurement technology is provided as a reference for the axial magnetic interference calculation; the correction result is more reasonable; antitangent operation in the azimuth angle calculation adopts taylor series expansion; and the calculation accuracy is improved.

Description

technical field [0001] The invention relates to wireless drilling equipment in oil and natural gas drilling equipment technology; in particular, it relates to a correction method and a correction system for magnetic interference of azimuth drilling tools. Background technique [0002] At present, there are various magnetic interferences in the azimuth measurement of the wireless MWD. 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 independently operating drill 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. Contents of the invention [0003] The technical problem to be solved by ...

Claims

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Application Information

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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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