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Error range analysis method for gyroscope measuring instrument

A technology of error range and measuring instrument, which is applied in the field of petroleum inclinometer and can solve the problem that the modeling process of gyro instruments cannot be generalized.

Active Publication Date: 2018-12-21
BEIHANG UNIV
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Problems solved by technology

However, in the harsh underground environment, the main random noise items of different gyroscopes are different during the continuous measurement process of gyroscopes, and the modeling process of gyroscope instruments cannot be generalized

Method used

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  • Error range analysis method for gyroscope measuring instrument
  • Error range analysis method for gyroscope measuring instrument
  • Error range analysis method for gyroscope measuring instrument

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Embodiment Construction

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0053] The embodiment of the present invention discloses a method for analyzing the error range of a gyroscope measuring instrument. Please refer to the attached figure 1 , including the following steps:

[0054] S11: The input of Allan variance is the average angular rate sequence Ω of the gyroscope, assuming that the sampling interval is τ i , the number of angular rate samples is N i , the loop condition i=0, the original angular rate sample is obtained b...

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Abstract

The invention discloses an error range analysis method for a gyroscope measuring instrument. The method comprises the following steps of carrying out random noise analysis on a gyroscope by utilizingan Allan variance method to obtain a random noise term and a random noise coefficient; building an azimuth angle error analysis model by utilizing the random noise term and the random noise coefficient; and forming an error model in a gyroscope instrument continuous measurement mode by the azimuth angle error analysis model, an initial point position error range model and a hole drift angle errormodel, and after the error models are superposed according to an error superposition principle, performing multivariate normal distribution to obtain an error range of a wellbore trajectory. Accordingto the method, the Allan variance method is used for analyzing the random noise term of the gyroscope, random noise is selected according to a result of Allan variance analysis to carry out error modeling, and the error range of the wellbore trajectory position is calculated, so that more reliable information is provided for the fields of wellbore anti-collision and the like.

Description

technical field [0001] The invention relates to the technical field of petroleum inclinometers, in particular to an error range analysis method for a gyroscope measuring instrument. Background technique [0002] Since the 1980s, many oilfields in China have entered the middle and late stages of development, and the exploration targets have become increasingly complex. It has become more difficult to stabilize production in old oilfields, and new technical problems continue to arise in oil and gas exploration in new areas. In order to improve the development efficiency of complex reservoirs such as thin reservoirs and hidden reservoirs, and fully exploit old oilfields, complex well structures such as directional wells, horizontal wells, branch wells and extended-reach wells have been widely used. The error range of accurate borehole trajectory plays a key role in the process of achieving the above goals. [0003] The traditional inclinometer is mainly an inclinometer compose...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00
CPCG01C25/00
Inventor 高爽李玲玲蔡晓雯卢鑫张若愚纪少文周文彬
Owner BEIHANG UNIV
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