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Logging-while-drilling orientation measurement error compensation method based on micro-quartz angular rate sensor

An angular rate sensor and measurement error technology, applied in the field of detection, can solve the problems of large measurement error, large zero drift, affecting the accuracy of azimuth angle measurement while drilling, etc.

Inactive Publication Date: 2008-01-16
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] In view of the above-mentioned defects in the prior art, the present invention applies a micro-quartz angular rate sensor as a solid-state vibration type to a north-seeking detection system in logging while drilling, and uses a gray neural network to model and compensate the zero drift of the gyro , to solve the problems of large zero drift of the azimuth measurement system while drilling, nonlinear scale factor, large measurement error, and affecting the azimuth accuracy of the measurement while drilling

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  • Logging-while-drilling orientation measurement error compensation method based on micro-quartz angular rate sensor
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  • Logging-while-drilling orientation measurement error compensation method based on micro-quartz angular rate sensor

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[0015] The technical solution of the present invention will be described in detail below with reference to the drawings and specific embodiments.

[0016] Figure 1 shows the zero output curve of the micro-quartz angular rate sensor. It can be seen from Figure 1 that the zero drift and scale factor change of the angular rate sensor is a complex nonlinear change process, which is difficult to describe with an accurate model . It is not only related to the running time of the system, but also related to the ambient temperature of the system running, and these two parameters have an effect on the zero output signal and scale factor of the angular rate sensor at the same time. At different system working time points, even if the system operating temperature is the same, there is a large deviation in the angular rate sensor zero output and scale factor results; similarly, when the angular rate sensor is started at different system operating temperatures, the angular rate sensor zero...

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Abstract

The invention provides a method for dynamic direction measurement error compensation while drilling based on microquartz angular rate sensor, belonging to probing technical field. The method comprises performing rapid wavelet filtering pretreatment to the original signal from the measurement system while drilling based on the characteristics of the output signal from the microquartz angular rate sensor and the noise characteristics of the scaling factor parameter, modeling in accordance with grey theory, applying operation method of accumulated generation to obtain regular nonlinear function corresponding to single value, building model of single valued mapping relation of the angular rate sensor electrical null in three-dimensional space, building drifting model of the angular rate sensor with time and temperature as input parameters, and approximating the single valued corresponding nonlinear function generated by accumulated generation method to improve the accuracy of dynamic measurement. The invention is suitable for directional well logging while drilling and micropore well logging.

Description

technical field [0001] The invention relates to the field of detection technology, in particular to a system error compensation method for an inclinometer while drilling, which is suitable for applications such as directional logging while drilling and micro-hole logging. Background technique [0002] Usually, there are many factors that affect the accuracy of well logging north-finding measurement, among which the more significant ones are the zero drift, linearity and installation structure error of the inertial sensor. The error in the dynamic measurement while drilling is the main error source of the logging while drilling system, which has not been well resolved. Its technical difficulties mainly lie in the long measurement time in the dynamic measurement while drilling, and it is difficult to provide a completely static state in one measurement. In the case of drastic changes in the surrounding environment such as temperature, the zero position drifts greatly and the s...

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Application Information

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IPC IPC(8): E21B47/02
Inventor 刘宇李秋俊黎蕾蕾潘武刘俊李登峰朱继华
Owner CHONGQING UNIV OF POSTS & TELECOMM
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