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第 40 卷 第 6 期                                                                       Vol. 40, No. 6
             2021 年 11 月                         Journal of Applied Acoustics                 November, 2021

             ⋄ 研究报告 ⋄

                      偶极子声波测井在套管井中的声场特征                                                          ∗



                       陈雪莲     1,2†  邵欢欢      1,2  张聪慧      3  祁 晓     3   李盛清     1,2   张淼鹤     1,2


                                       (1  中国石油大学 (华东) 地球科学与技术学院         青岛   266580)
                                       (2  中国石油大学 (华东) 深层油气重点实验室         青岛   266580)
                                            (3  中海油田服务股份有限公司        廊坊   065201)
                摘要：偶极子声波测井在套管井中的应用越来越多，该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。该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。
                关键词：偶极声源；套管井；套管弯曲波；频散
                中图法分类号: TB51           文献标识码: A          文章编号: 1000-310X(2021)06-0833-10
                DOI: 10.11684/j.issn.1000-310X.2021.06.005

                    Response characteristics of dipole acoustic logging in cased borehole

                            CHEN Xuelian  1,2  SHAO Huanhuan  1,2  ZHANG Conghui  3  QI Xiao 3

                                            LI Shengqing 1,2  ZHANG Miaohe 1,2

                   (1 College of Earth Science and Technology, China University of Petroleum East China, Qingdao 266580, China)
                    (2 Key Laboratory of Deep Oil and Gas, China University of Petroleum East China, Qingdao 266580, China)
                                      (3 China Oilfield Services Co., Ltd., Langfang 065201, China)
                 Abstract: 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.
                 Keywords: Dipole source; Cased borehole; Casing flexural wave; Dispersion

             2020-11-18 收稿; 2021-01-24 定稿
             国家自然科学基金项目 (41774141, 41821002)
             ∗
             作者简介: 陈雪莲 (1978– ), 女, 河北衡水人, 博士, 副教授, 研究方向: 声波测井方法及岩石物理。
             † 通信作者 E-mail: chenxl@upc.edu.cn
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