井下套管厚度评价的方法研究  

On the Measurement of Thickness of Downhole Casing.

作　　者：乔文孝[1] 车小花[1] 杜光升[1] 

机构地区：[1]石油大学资源系

出　　处：《测井技术》2000年第6期403-406,共4页Well Logging Technology

摘　　要：利用理论分析和实验模拟的方法研究了超声脉冲反射技术测量井下套管厚度的方法。研究结果表明 ,垂直入射固体板并被反射的超声脉冲波的频谱在该板的共振频率取得极小值时出现谱陷 ,利用谱陷频率可以比较准确地评价固体板的厚度。对于厚度范围为 4～ 10 mm的套管 ,所用换能器的工作频率范围应为 2 70～ 710 k Hz。The Methodological investigation on the measurement of thickness of downhole casing with ultrasonic pulse echo technique is carried out both in theory and in experiments. It is shown from the paper that,for normal incidence, there are distinct minima in the broadband spectra of ultrasonic pulse reflected by a steel plate immersed in water. These minima,which are related to the thickness resonance of steel plate,can be easily and accurately used to predict the thickness of the plate. Because the thickness of casing is from 4 to 10 mm,the acoustic frequency should be in the range from 270 to 710 kHz.

关 键 词：采油 套管 检测 厚度 评价 超声波检验 共振频率 

分 类 号：TE931.207[石油与天然气工程—石油机械设备]