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Digital filtering method for underground instrument signal transmission

A technology of digital filtering and signal transmission, applied in the direction of digital technology network, impedance network, electrical components, etc., can solve the problems of low transmission frequency, different types of interference signals, and inconvenient modification of filtering parameters, so as to eliminate interference and improve filtering effect of effect

Active Publication Date: 2011-02-16
GOALTECH
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Problems solved by technology

[0003] However, in the existing filtering technology, when it is applied to the logging-while-drilling mud pressure pulse signal, because its transmission frequency is relatively low, it is relatively close to the frequency of the interference source, so the accuracy and effect of filtering by using hardware filtering methods are as high as It does not meet the requirements, and at the same time, the types of interference signals are different in different environments, and it is inconvenient to change the filtering parameters

Method used

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  • Digital filtering method for underground instrument signal transmission
  • Digital filtering method for underground instrument signal transmission
  • Digital filtering method for underground instrument signal transmission

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Embodiment Construction

[0015] The embodiment of the present invention provides a digital filtering method for downhole instrument signal transmission, which can improve the filtering accuracy of mud pulse signal, and can adjust filtering parameters according to the signal type, thereby improving the filtering effect of downhole instrument signal transmission.

[0016] The digital filtering method for downhole instrument signal transmission specifically includes:

[0017] First, collect the data that needs to be digitally filtered; remove the spike noise in the waveform through the method of limiting average filtering; use the band-pass digital filter algorithm to filter out the waveforms other than the signal frequency; in order to make the output waveform The result is smoother, and the weighted recursive average filtering method is used to process the filtering results of the previous step.

[0018] In addition, in the specific implementation process, the above-mentioned method of using the band-p...

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Abstract

The embodiment of the invention provides a digital filtering method for underground instrument signal transmission. The method comprises the following steps of: acquiring data needing digital filtering; removing sharp pulse noise from a waveform through an amplitude-limiting average filtering method; and removing waveforms lower than and higher than the signal frequency through a band-pass filtering method by using a digital filter algorithm. The digital filtering method can improve the accuracy of mud pulse signal filtering, and can adjust the filtering parameters according to signal types so as to improve the filtering effect on the underground instrument signal transmission.

Description

technical field [0001] The invention relates to the field of petroleum logging while drilling, in particular to a digital filtering method for downhole instrument signal transmission. Background technique [0002] At present, in the field of oil logging while drilling, the commonly used signal filtering is completed by hardware circuits, generally passive filter circuits or active filter circuits are used, and this method is simple to implement. [0003] However, in the existing filtering technology, when it is applied to the logging-while-drilling mud pressure pulse signal, because its transmission frequency is relatively low, it is relatively close to the frequency of the interference source, so the accuracy and effect of filtering by using hardware filtering methods are as high as At the same time, the types of interference signals are different in different environments, and it is inconvenient to change the filtering parameters. Contents of the invention [0004] The ...

Claims

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Application Information

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IPC IPC(8): H03H17/02
Inventor 王小虎石峻峰常永旺
Owner GOALTECH
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