文章摘要
陈雪莲,邵欢欢,张聪慧,祁晓,李盛清,张淼鹤.偶极子声波测井在套管井中的声场特征*[J].,2021,40(6):833-842
偶极子声波测井在套管井中的声场特征*
Response characteristics of dipole acoustic logging in cased borehole
投稿时间:2020-11-18  修订日期:2021-11-09
中文摘要:
      偶极子声波测井在套管井中的应用越来越多,本文重点研究了套管井不同胶结状况下偶极子声源在套管井中激发的声场特征,通过解析方法分析了水泥环第一界面和第二界面不同胶结状况下井孔模式波的频散和衰减。计算结果表明,在水泥环第一界面或第二界面胶结差时井孔声场中可观测地层弯曲波和套管弯曲波;与胶结良好时相比,地层弯曲波的频散曲线向低频偏移,水泥环第二界面胶结差时偏移较大;套管弯曲波对水泥界面存在的流体环厚度很敏感,随着流体环厚度的增加套管弯曲波的相速度逐渐增大,激发幅度也明显增强,这一特征为利用套管弯曲波的相速度估算流体环厚度提供了可能。本文的计算结果为利用套管井中越来越多的偶极子声波测井资料评价水泥胶结质量奠定了理论基础。
英文摘要:
      Dipole acoustic logging is widely used in cased borehole. In this paper, we study the characteristics of the acoustic field excited by a dipole source located in cased borehole for different cement-bond conditions. The dispersion and attenuation of the borehole mode waves in different cement-bond conditions at the first and second interfaces of cement ring are analyzed by using analytical method. The results indicate that, the formation and casing flexural waves can be observed when the poor bonding occurs at the first or second interface of cement ring. Compared with the good cement-bond scenario, the dispersion curve of formation flexural wave shifts toward to low frequency, especially, the migration is larger when the second interface of the cement ring is poorly cemented. Furthermore, the casing flexural wave is sensitive to the thickness of fluid ring at cement interface. With the increasing thickness of fluid ring, the phase velocity of casing flexural wave increases gradually, and the excitation amplitude also increases significantly. Which makes it possible to estimate the thickness of fluid ring by using the phase velocity of casing flexural wave. The results, therefore, lay a theoretical foundation for evaluating cement-bond quality by using dipole acoustic logging data from cased borehole.
DOI:10.11684/j.issn.1000-310X.2021.06.005
中文关键词: 偶极声源  套管井  套管弯曲波  频散
英文关键词: dipole source  cased borehole  casing flexural wave  dispersion
基金项目:(41774141,41821002)
作者单位E-mail
陈雪莲* 中国石油大学(华东)地球科学与技术学院 chenxl@upc.edu.cn 
邵欢欢 中国石油大学(华东)地球科学与技术学院 shhyou2@163.com 
张聪慧 中海油田服务股份有限公司 zhangch@cosl.com.cn 
祁晓 中海油田服务股份有限公司 qixiao4@cosl.com.cn 
李盛清 中国石油大学(华东)地球科学与技术学院 shidalishengqing@yeah.net 
张淼鹤 中国石油大学华东地球科学与技术学院 1523628360@qq.com 
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