Research On Data Processing Method Of Noise Spectrum Logging

Noise spectrum logging is the use of spectrum analysis technology,through the analysis of downhole noise frequency and intensity to identify the source of fluid flow noise,channeling location and injection production horizon.The logging technology can provide effective guidance for subsequent engineering operations.This paper investigates the mainstream noise logging tools at home and abroad,understands the working process of noise logging,compares the data acquisition parameters of various kinds of tools,analyzes and analyzes the DB logging format data of Sondex company,and develops a set of general interpretation software for noise logging data processing by using C # language,which meets the data decomposing and data processing of various kinds of noise logging tools from the function,and can be used for data processing Analysis of the flow outside the pipe,quantitative evaluation of injection production profile,etc.In this paper,the noise spectrum technology is studied in three aspects.Firstly,the main noise instruments at home and abroad are investigated and analyzed.The characteristics,advantages and application of NTO,Alfa,ant and other noise instruments are investigated.The practicability of noise spectrum logging technology in reservoir flow,formation pressure and leakage detection is analyzed.The logging data in DB format of Sondex company is studied in detail.Secondly,the causes and types of downhole noise are studied,and the frequency and amplitude of the noise collected from the characteristics of pipe flow,completion tools,casing channeling,reservoir fractures and reservoir pores are analyzed.The processing method of noise logging data is studied.This paper focuses on the filtering method of noise data and the extraction method of key signals.The improved wavelet threshold method and fitting method are used to eliminate background noise and conducted noise respectively.Finally,the module method of temperature amplitude and suction intensity is used to estimate the anomaly.Third,the development and implementation of noise spectrum data processing system.At present,in the aspect of noise spectrum logging data processing software,there is a lack of common noise logging data processing and interpretation tools at home and abroad.The processing software of each company is developed for our company's instruments,which can only meet the analysis and processing of our company's noise logging data,and has no quantitative evaluation function of injection production profile,so it can not be applied to the determination of highly deviated wells and horizontal data Quantity evaluation.The noise spectrum data processing system designed in this paper includes four core modules: original data De coding,stationary point data synthesis,signal filtering enhancement and absorption intensity estimation,which effectively solve the above problems.