Elimination method of slurry pulse signal pump stroke noise

Abstract

The invention discloses an elimination method of slurry pulse signal pump stroke noise. The order formula (N=Fs / Fo) of a comb filter is utilized, wherein Fs is the sampling frequency of a slurry signal, and Fo is a product of the movement rate of a single slurry pump piston and the number of slurry pumps, and the order of the comb filter is determined; when the pump stroke noise is eliminated, a filtering process of a slurry pulse signal is realized by utilizing MATLAB software, and comprises the following steps: 1) collecting the slurry pulse signal on site; 2) according to the signal to noise ratio of the signal, determining the bandwidth (BW) of the comb filter, designing the required comb filter according to the BW and the determined order; 3) converting the slurry pulse signal to enable a signal value to be within an interval (-1,1), and obtaining a signal X(n); 4) loading the signal X(n) into the comb filter to carry out convolution filtering to obtain a filtered signal Y(n); and 5) plotting, and observing a signal filtering situation. The invention breaks through the restriction of a hardware circuit, the MATLAB software is utilized to effectively realize the filtering process of the slurry pulse signal, and meanwhile, the comb filter is applied to the slurry pulse signal so as to further enhance a filtering effect.

Description

technical field [0001] The invention relates to the technical field of oil drilling logging while drilling, in particular to a method for eliminating pumping noise of mud pulse signals. 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. This method is simple to implement, but when applied to logging while drilling mud pressure For pulse signals, due to their low transmission frequency, they are relatively close to the frequency of the interference source, so the accuracy and effect of filtering by hardware filtering methods cannot meet the requirements. At the same time, the types of interference signals are different in different environments. The parameters are also very inconvenient. This requires some high-resistance signal processing filters in the system equipment to improve the channel quality o...

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Problems solved by technology

[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. This method is simple to implement, but when applied to logging while drilling mud pressure For pulse signals, due to their low transmission frequency, they are relatively close to the frequency of the interference source, so the accuracy and effect of filtering by hardware filtering methods cannot meet the requirements. At the same time, the types of interference signals are different in different environments. The parameters are also inconvenient

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