远场涡流检测的快速处理方法研究与电路设计

发布时间：2018-04-11 14:48

本文选题：套管损伤检测 + 远场涡流　；参考：《电子科技大学》2017年硕士论文

【摘要】：井下套管缺陷损伤检测一直是石油测井领域的重点,但国外的技术垄断导致现在国内常用的测井仪器一般只能检测套管内壁的情况,无法检测套管外壁。在“多频涡流套损检测仪的研制”项目中,本文设计出能够同时检测出套管内外壁损伤状态的远场涡流检测系统,该仪器能够在较为复杂的环境中进行长时间的测试工作,而且检测效率与精度均能达到较高水平。本文分析远场涡流检测的现象及原理,并根据电磁信号在传播过程中的变化,明确远场检测中电磁信号与套管损伤之间的关系。本文以快速计算检测信号的相位差为目标,并且讨论仪器参数对测试结果的影响。为了完成测试目标,文中讨论分析了三种计算检测信号相位差的方法,并对过零检测法的缺点进行了改进。在本文电路系统设计中,激励信号电路负责产生初始信号,控制高电压送入激励线圈使其产生远场涡流信号,并由信号处理电路对携带有套管缺陷损伤信息的信号进行调理与计算,最后得出检测信号相对于参考信号的相位差。然后本文对远场涡流检测系统进行了多方面的检测,测试并分析了电路系统上的信号,整支仪器的在温度升高环境中工作情况,以及实验套管的检测情况。多项测试的结果报告证明了多频涡流套损检测仪能够完成套管管壁缺陷损伤的检测目标,验证了本文设计和使用的测相方法和电路系统。
[Abstract]:The casing damage detection has been the focus of the field of well logging, but the monopoly of foreign technology to now commonly used domestic logging instruments generally only detect the inner wall of the casing, the casing outer wall can not be detected. In the development of multi frequency eddy current casing damage detector project, this paper designed to simultaneously detect the far field eddy current testing inside and outside wall casing damage state, the testing instrument can for a long time in a more complex environment, and the detection efficiency and accuracy can reach a higher level. The far field eddy current testing phenomenon analysis and principle, and according to the change of the electromagnetic signal in the communication process, clear the far field between electromagnetic detection the relationship between the signal and the casing damage. The phase difference of the signal for the fast calculation of detecting target, and discuss the effect of instrumental parameters on the test result. In order to complete the test Test target, paper discusses the three methods of calculating the phase difference detection signal, and the zero crossing detection method is improved in this paper. The design of circuit system, excitation signal circuit responsible for generating the initial signal into the excitation coil of the far field eddy current signal control high voltage, and the signal processing the circuit has defects of casing damage information to carry out regulation and calculation, finally obtains the detection signal phase difference relative to the reference signal. Then this paper examined many aspects of the far field eddy current testing system, analyzed the system test and signal circuit, a temperature instrument in the working environment, and detection the number of casing. Test results report that multi frequency eddy current casing damage detector can detect the target wall defects of casing damage, verify the design and use of The phase measurement method and the circuit system.

【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE931.2;TH878

【参考文献】