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A method and device for correcting the influence of borehole eccentricity on azimuth signals

A signal and azimuth technology, applied in geological exploration and petroleum fields, can solve problems such as stratigraphic boundary influence and limited correction effect

Active Publication Date: 2020-08-25
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, it is found that the correction effect of using this fixed correction coefficient on borehole eccentricity is extremely limited, and the use of this method after correction still has a great impact on the judgment of formation boundaries

Method used

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  • A method and device for correcting the influence of borehole eccentricity on azimuth signals
  • A method and device for correcting the influence of borehole eccentricity on azimuth signals
  • A method and device for correcting the influence of borehole eccentricity on azimuth signals

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no. 1 example

[0039] see figure 1 In this embodiment, a method for correcting the influence of borehole eccentricity on azimuth signals is provided, the method comprising:

[0040] Step S10: In the three-dimensional wellbore model of the uniform formation, obtain the axial signal corresponding to the axial receiving antenna, the first azimuth signal corresponding to the first azimuth receiving antenna, and the second azimuth signal corresponding to the second azimuth receiving antenna; wherein , the axial receiving antenna, the first azimuth receiving antenna and the second azimuth receiving antenna are all antennas of the azimuth electromagnetic wave resistivity instrument while drilling;

[0041] Step S20: Construct a polynomial representing a signal relationship based on the axial signal, the first orientation signal, and the second orientation signal; wherein, the signal relationship is the first orientation signal and the second orientation signal The relationship between the signal r...

no. 2 example

[0071] Please refer to Figure 6 , based on the same inventive concept, a device 300 for correcting the influence of wellbore eccentricity on azimuth signals is provided in this embodiment, and the device 300 includes:

[0072] The simulation parameter acquisition module 301 is used to obtain the axial signal corresponding to the axial receiving antenna, the first azimuth signal corresponding to the first azimuth receiving antenna, and the second azimuth signal corresponding to the second azimuth receiving antenna in the three-dimensional wellbore model of the uniform formation. Two azimuth signals; wherein, the axial receiving antenna, the first azimuth receiving antenna and the second azimuth receiving antenna are all antennas of the azimuth electromagnetic wave resistivity instrument while drilling;

[0073] A signal relationship construction module 302, configured to construct a polynomial representing a signal relationship based on the axial signal, the first orientation ...

no. 3 example

[0086] In this embodiment, a computer-readable storage medium is also provided, on which a computer program is stored, and when the program is executed by a processor, the following steps are implemented:

[0087] In the three-dimensional model of the wellbore in the uniform formation, the axial signal corresponding to the axial receiving antenna, the first azimuth signal corresponding to the first azimuth receiving antenna, and the second azimuth signal corresponding to the second azimuth receiving antenna are obtained; The receiving antenna, the first azimuth receiving antenna and the second azimuth receiving antenna are all antennas of the azimuth electromagnetic wave resistivity instrument while drilling; constructing a signal relationship based on the axial signal, the first azimuth signal and the second azimuth signal polynomial; wherein, the signal relationship is the relationship between the signal ratio between the first azimuth signal and the second azimuth signal and...

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Abstract

The invention discloses a method and device for correcting the influence of eccentricity of a borehole on azimuth signals. The method includes the steps that an axial signal corresponding to an axialreceiving antenna, a first azimuth signal corresponding to a first azimuth receiving antenna and a second azimuth signal corresponding to a second azimuth receiving antenna are obtained in a boreholethree-dimensional model in a uniform formation; a polynomial representing a signal relationship is constructed based on the axial signal, the first azimuth signal and the second azimuth signal; according to an axial actual measured signal received by the axial receiving antenna in a borehole and the polynomial, the correction coefficient to correct the eccentricity of the borehole is obtained; andaccording to the correction coefficient, a reflected signal of the borehole wall is eliminated when the instrument in the actual measurement process is eccentric in the borehole to obtain a third azimuth signal characterizing foundation boundary distance. The influence factors of formation conductivity is comprehensively considered when the effects of eccentricity of the borehole is eliminated, the effects of eccentricity of the borehole is suppressed more thoroughly, and finally the formation boundary distance can be can determined more accurately.

Description

technical field [0001] The invention relates to the technical fields of petroleum and geological exploration, in particular to a method and a device for correcting the influence of borehole eccentricity on azimuth signals. Background technique [0002] The currently used azimuth electromagnetic wave resistivity instrument mainly includes transmitting antenna and receiving antenna, which are analyzed by mirror image method. When the tool is located in a uniform formation, the signal in the azimuth receiving coil is zero due to the orthogonality of the transmitting and receiving coils. When the tool is in a layered formation, the receive coil picks up the reflected signal from the formation boundary. However, when the tool is eccentric in the borehole, the electromagnetic waves reflected by the borehole wall in different directions cannot be cancelled, so that the azimuth receiving coil receives the response of the borehole eccentricity, which is superimposed on the reflected...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00G06F30/23G06T17/00
CPCE21B49/00G06T17/00
Inventor 范建保陈文轩张文秀
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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