水泥胶结局部缺失声波变密度测井响应计算  

The Calculation of Sonic Variable Density Log Response on Partial Loss in the Cement Sheath

作　　者：张美玲[1] 樊家屹 侯春会 张天宇 ZHANG Mei-ling;FAN Jia-yi;HOU Chun-hui;ZHANG Tian-yu(Northeast Petroleum University School of Earth Sciences,Daqing 163318,China;Daqing Branch Company of CNPC Logging,Daqing 163412,China)

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318 [2]中国石油集团测井有限公司大庆分公司,黑龙江大庆163412

出　　处：《数学的实践与认识》2020年第9期89-96,共8页Mathematics in Practice and Theory

基　　金：国家自然科学基金(41274132)。

摘　　要：声波变密度测井是目前水泥胶结质量检测的重要手段.针对声波变密度测井解释中水泥环局部缺失程度评价这一难点,以井孔声波波动理论为基础,采用柱状多层局部扇形非对称介质模型,开展三维应力-速度有限差分数值模拟方法研究,实现了水泥环不同角度缺失情况下的声波响应计算.针对大庆油田广泛使用的声波变密度仪器,针对水泥环19种角度缺失情况进行计算,并建立了缺失角度与水泥胶结指数关系式.计算结果可以为实际生产中水泥环局部缺失程度的定量评价提供指导.Sonic variable density logging is an important means of inspecting cement bonding quality now.It is difficult to evaluate the degree of local loss of cement ring in acoustic wave variable density logging interpretation.Based on the wellbore acoustic wave theory,this paper uses a columnar multi-layer local fan-shaped asymmetric medium model to carry out a three-dimensional stress-velocity finite difference numerical simulation method.Achieved the acoustic wave response calculation under the condition that the cement ring is missing at different angles.?Focus on the sonic variable density instrument widely used in Daqing Oilfield,the calculation of 19 kinds of angle missing of cement ring is carried out,and the relationship between missing angle and cement bond index is established.The calculation results can provide guidance for the quantitative evaluation of the degree of local loss of cement rings in actual production.

关 键 词：局部非对称介质模型 三维应力-速度有限差分方法 声波变密度测井 水泥环局部缺失 胶结指数 

分 类 号：P631.81[天文地球—地质矿产勘探]