固井水泥胶结声波测井声学机理探讨  

A discussion on the mechanism of acoustic cement bond logging

作　　者：郑友志[1] 马发明[1] 陈敬鹏[2] 罗咏枫 刘洪[4] 李丁[5] 汪瑶[6] 唐诗国[1] 郭小阳[6] 

机构地区：[1]中国石油西南油气田公司采气工程研究院 [2]中国石化石油工程西南公司测井分公司 [3]仁智实业有限责任公司 [4]重庆科技学院石油工程学院 [5]中国石油天然气集团公司川庆钻探工程公司 [6]西南石油大学

出　　处：《天然气工业》2009年第8期50-53,共4页Natural Gas Industry

基　　金：国家自然科学基金项目(编号:50604022)的资助

摘　　要：当固井质量测井解释结果与实际情况不一致时,常引起油气田施工单位与设计部门的较多争议。针对这一问题,利用声波在两介质分界面上的能量分配及声耦合理论,建立了界面胶结模型,对目前固井质量评价方法进行了声学机理研究。结果表明:水泥环的声阻抗值与水泥胶结测井声波值成反比;声波变密度测井图上,地层波能量强弱与固井质量的关系必须结合地层岩性及其声阻抗来解释分析,例如当地层岩性为泥岩或石灰岩时,地层波强有可能表示的是第二界面胶结质量差。该方法为固井质量的精细评价提供了理论参考。Real,objective and proper reflection of the actual cementing quality will be a guarantee for follow-up completion and stimulation design as well as a successful filed operation.Otherwise,disputes between the field operation departments and the designing departments will often arise.Therefore this paper set up an interfacial cementation model on the basis of partition of acoustic energy and acoustic coupling theory to study the acoustic mechanism of the primary cement evaluation method.This study shows that the acoustic impedance of cement sheath is inversely proportional to the CBL amplitude,and the relationship between the power of the formation wave and the cementing quality is dependent on the lithology and its acoustic impedance.For example,strong layer-wave of the VDL result in mudstone or dolomite formation probably means poor cementing quality at the second interface.This method will be an important theoretical reference for refined evaluation of cementing quality.

关 键 词：固井 界面胶结模型 测井 声阻抗 声耦合 声学机理 

分 类 号：TE256[石油与天然气工程—油气井工程]