测井技术2018，Vol.42Issue(1)：98-101,4.DOI:10.16489/j.issn.1004-1338.2018.01.017
基于小波变换定量评价固井质量第Ⅱ界面
Quantitative Cementing Quality Evaluation of Second Interface Based on Wavelet Transform
摘要
Abstract
This paper proposes the use of variable density,a full-wave signal and time-frequency analysis of wavelet transform,Tests proved Moret wavelet analysis is right for variable density layer wave computation.The strength and location of the formation wave can be calculated,thusⅡ interface cementing quality can be quantitatively evaluated.After the wavelet transform,the variable density signal sequence is decomposed into different frequency,amplitude,position (time)of the small wave shoaling,and the small wave shoaling consistent with layer wave feature can be used to reconfigure the layer wave,and wavelet transform can also reconfigure the layer wave accurately,its position and the amplitude are very good,the information of front casing wave maintains the status quo,the information of back end mud arrival is restored,which can fully meet the requirements of primary cement evaluation.T he cementation of Ⅰ interface is medium or well,the layer wave is more stronger(energy and amplitude are more larger),Ⅱcemented interface is better.The result using wavelet transform to reconfigure layer wave is very good,the front casing wave's information of which before the layer wave arrival is completely filtered out,and this provides a good basis for more exactly evaluated cementation Ⅱ interface by using the reconfigured layer wave's information.关键词
测井解释/小波变换/声波变密度测井/地层波重构/固井质量/定量评价Key words
log interpretation/wavelet transform/acoustic variable density logging/formation wave rebuild/cementing quality/quantitative evaluation分类
天文与地球科学引用本文复制引用
王长江,钱建设,李长文,申晓娟,于清秀,陈鸿傲..基于小波变换定量评价固井质量第Ⅱ界面[J].测井技术,2018,42(1):98-101,4.基金项目
国家科技重大专项大型油气田与煤层气开发(2016ZX05031-1-2-4) （2016ZX05031-1-2-4）
