Method for reducing precision of continuous gyroscope clinometer under influence of irregular vibration

A gyro inclinometer and vibration-influenced technology, which is applied in the directions of measurement, earthwork drilling, borehole/well components, etc., can solve the problem of inability to realize uniform motion pipe wall fouling, random posture vibration impact, and reduce the accuracy of continuous gyro inclinometers and other issues, to achieve the effect of improving the test accuracy of the instrument and improving the measurement accuracy

Inactive Publication Date: 2019-01-15
贵州航天凯山石油仪器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for reducing the impact of irregular vibration on the accuracy of continuous gyro inclinometers in order to solve the impact of random posture vibration impact caused by the inability of the instrument to achieve uniform movement in the oil well and the irregular scaling and deformation of the pipe wall

Method used

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  • Method for reducing precision of continuous gyroscope clinometer under influence of irregular vibration
  • Method for reducing precision of continuous gyroscope clinometer under influence of irregular vibration
  • Method for reducing precision of continuous gyroscope clinometer under influence of irregular vibration

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Calibration modeling

[0022] 1). Position calibration

[0023] The method of static 8-position calibration is used to determine the calibration factors of the added meter, the installation error and the installation error of the gyroscope and the added meter, and complete the calibration of the entire system. The specific arrangement of the 8 positions is as follows:

[0024] X-Y-Z

earth gravity

northeast sky

0 0 -g

southwest day

0 0 -g

North East

0 0 g

south west

0 0 g

Southwest

-g 0 0

Tianbei

-g 0 0

Dinanxi

g 0 0

North East

g 0 0

[0025] During position calibration, test the accelerometer output average value f at each position i , get the regression calculation model of the accelerometer:

[0026]

[0027] Modeled by the output of the accelerometer:

[0028] f = a 0 +K a a b

[0029] Recorded as:

[0030] f=MA

[0031] In the formula,

[0032] f=[f 1 ...

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Abstract

The invention discloses a method for reducing the precision of a continuous gyroscope clinometer under the influence of irregular vibration. The method adopts the three-axis acceleration information and combines the z-axis angular velocity information of a fiber-optic gyroscope. Meanwhile, the interference, except the instrument attitude measurement, is removed. Therefore, the measurement precision of the continuous gyroscope clinometer is comprehensively improved. According to the method, the problem that the precision of the continuous gyroscope clinometer is reduced due to the irregular collision of the continuous gyroscope clinometers with an oil sleeve during the downhole upward and downward process can be solved.

Description

technical field [0001] The invention relates to the application of a gyroscope inclinometer for continuous dynamic test track in the petroleum well logging industry. Background technique [0002] The gyro inclinometer collides with the pipe wall irregularly during the up-and-down movement due to damage, deformation, wax deposition, etc. of the oil-casing well. Cause interference, and the wellbore trajectory of the navigation settlement during continuous movement will introduce errors, resulting in a decrease in instrument accuracy. The common gyro inclinometer simply performs low-pass filtering on the three-axis acceleration information to obtain new acceleration information. The band-pass frequency of the filter, the attenuation coefficient and the order of the filter are fixed and cannot be changed according to the well conditions. The method is simple and rude . In the actual working process of the instrument, the speed of going up and down the well cannot be truly cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/02
CPCE21B47/02
Inventor 孔凡康谢雪峰曾勇陆松
Owner 贵州航天凯山石油仪器有限公司
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