Method used for improving accuracy of azimuthal angle and tool face angle of small well inclined downward fiber-optic gyroscope inclinometer

A tool face angle, fiber optic gyroscope technology, applied in the directions of surveying, earthwork drilling, wellbore/well components, etc., can solve the problem of large azimuth angle φ error and so on

Inactive Publication Date: 2013-05-15
BEIHANG UNIV
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Problems solved by technology

[0024] In order to solve the problem of large errors in azimuth ψ and tool face angle φ when the well inclination angle θ is less than 5 degrees, the present i...

Method used

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  • Method used for improving accuracy of azimuthal angle and tool face angle of small well inclined downward fiber-optic gyroscope inclinometer
  • Method used for improving accuracy of azimuthal angle and tool face angle of small well inclined downward fiber-optic gyroscope inclinometer
  • Method used for improving accuracy of azimuthal angle and tool face angle of small well inclined downward fiber-optic gyroscope inclinometer

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Embodiment Construction

[0054] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0055] see image 3 , Figure 3A ~ Figure 3D As shown, the fiber optic gyro inclinometer used in the petroleum industry generally consists of a central processor 1, a signal processor 2, a counter 3, an optical cable winch 4, a tension sensor 5, a derrick 6, an optical cable 8 and a downhole probe 10. The central processor 1 is connected to the signal processor 2 through the RS232 interface, the optical cable winch 4 is connected to the signal processor 2 through the cable 11, the counter 3 is installed on the optical cable winch 4, the optical cable 8 is wound on the optical cable winch 4, and the derrick 6 is placed on the Above the measured wellhead 7, a tension sensor 5 is installed on the derrick 6, and one end of the optical cable 8 is connected to one end of the downhole probe 10 through the tension sensor 5.

[0056] Wherein, the control flow of the...

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Abstract

The invention discloses a method used for improving the accuracy of an azimuthal angle and a tool face angle of a small well inclined downward fiber-optic gyroscope inclinometer. The method utilizes the posture angle relationship between the azimuthal angle and the tool face angle and combines triaxial acceleration information, thereby avoiding the error of the phenomenon that 0 is divided by 0 in posture measurement of the fiber-optic gyroscope inclinometer. When the well drift angle theta is smaller than 5 degrees, the method can be used for lowering the error of the azimuthal angle and the tool face angle, so that the measurement accuracy of the fiber-optic gyroscope inclinometer is improved comprehensively.

Description

technical field [0001] The present invention relates to a fiber optic gyro inclinometer used in the petroleum industry, more particularly, refers to a fiber optic gyro inclinometer used for attitude measurement, the obtained measurement data (well inclination, azimuth and tool face angle) and belongs to the technical field of fiber optic gyroscope inclinometers. Background technique [0002] The inclinometer is a borehole trajectory measurement system. By measuring the inclination and azimuth information of the measured borehole at different depths along the wellbore, the purpose of monitoring and drawing the borehole trajectory can be achieved by combining the depth information. Therefore, effective wellbore trajectory engineering parameters are provided. Its application fields include oil exploration and development logging, hydraulic ring logging, solid mineral logging, etc. [0003] At present, according to different measurement principles, there are mainly two types o...

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Application Information

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IPC IPC(8): E21B47/022
Inventor 张春熹高爽林铁余健李先慕王璐焦禹舜孔庆鹏
Owner BEIHANG UNIV
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