| 孙志峰,陈洪海,刘西恩.超声反射成像测井的有限元分析*[J].,2013,32(6):495-500 |
| 超声反射成像测井的有限元分析* |
| The finite element analysis of ultrasonic reflection method used in acoustic logging |
| 投稿时间：2013-08-01 修订日期：2013-10-30 |
| 中文摘要: |
| 利用有限元方法研究了有限长换能器激发的超声波在套管井多层介质中的传播规律。数值模拟了换能器长度及套管曲率对反射回波的影响。随着换能器长度增加,反射回波频谱谱陷个数由单一向多个变化；套管共振透射窗的反射波相对能量先逐渐减小后振荡变化,较小长度的换能器对套管与水泥环界面的声阻抗区分能力优于较大长度的换能器。随着套管曲率的增大,套管共振透射窗的反射波由单一模式的厚度振动纵波向其他模式波变化。数值模拟结果对超声脉冲反射声波测井仪器的换能器结构优化设计起到了良好的指导作用。 |
| 英文摘要: |
| Acoustic field of plane ultrasonic transducer is analyzed in multilayer medium in casing well by using the finite element method. The influence of length of transducer and casing curvature on ultrasonic pulse echo is also simulated numerically. With the increase of length of transducer, the number of leakage peak of frequency spectrum changes from single to multiple. The relative energy of reflection wave within the window of resonant transmission increases firstly and then changes oscillatory. The small transducer’s discriminatory ability of acoustic impedance is bigger than that of the large one. With the increase of casing curvature, reflection wave within the window of resonant transmission changes from a single mode to other modes. Numerical simulation results play a good guidance role on the optimization design for ultrasonic transducer. |
| DOI：10.11684/j.issn.1000-310X.2013.06.010 |
| 中文关键词: 超声反射,频谱,套管曲率,有限元,声波测井 |
| 英文关键词: Ultrasonic pulse echo, Frequency spectrum, Casing curvature, Finite element analysis, Acoustic logging |
| 基金项目:国家科技重大专项(2011ZX05020-005)和国家863项目(SQ2010AA0920229001)的资助 |
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