Noise elimination method and device for measurement while drilling (MWD) system

Abstract

The invention discloses a noise elimination method for a measurement while drilling (MWD) system. The method comprises the following steps: receiving an acquired mud signal and determining the characteristic frequency of a periodic noise signal in the mud signal; performing Fourier transform on the mud signal to obtain a mud signal in a frequency domain; and obtaining a denoised mud frequency domain output signal according to the characteristic frequency of the periodic noise signal in the mud signal, the mud signal in the frequency domain and a preset suppression factor. Through the scheme ofthe invention, the periodic noise of the MWD system is eliminated in the frequency domain.

Description

technical field [0001] The invention relates to the field of well logging, in particular to a noise elimination method and device for a measurement-while-drilling MWD system. Background technique [0002] The LWD system is used to measure downhole geological and engineering parameters in real time during the drilling process. The mud pulse data demodulation system while drilling is used to transmit the logging while drilling data from downhole to the surface in real time. This transmission system uses the mud interception effect generated by the pulser movement to cause mud pressure fluctuations, and modulates the digital signal in the mud pressure wave and transmits it to the ground, so as to realize the real-time transmission of downhole measurement data to the ground. The mud pulse while drilling data transmission system consists of three main functional modules: mud pulse generator, mud signal transmission channel, and pressure wave acquisition and demodulation system. ...

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Problems solved by technology

[0004] At present, in the demodulation of mud pulse while drilling data, the noise reduction methods used include the method of eliminating pump noise in t

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