【作者】 钟涛；

【导师】 张伟；

【作者基本信息】 电子科技大学 ， 仪器仪表工程（专业学位）， 2021， 硕士

【摘要】 超声成像测井是测井技术中的一个重要发展方向,具有成像分辨率高、反映井壁信息多等特点。在井周超声成像测井仪的仪器电路研制过程中,会有功能验证、硬件检测、软件维护和仪器保养方面的问题,因此提出了井周超声成像测井仪检测系统的设计需求。本文首先从仪器结构、测井原理等方面详细介绍了井周超声成像测井仪的工作原理;然后分析了检测系统的任务需求,其主要用于测井仪器在前期研发的功能验证,首波到时提取算法的研究以及超声波换能器性能的测试等功能。然后论文提出了检测系统的设计方案,将检测系统设计分为硬件系统设计和显控软件设计。检测系统的硬件系统围绕测井仪器电路搭建。测井仪器电路是井周超声成像测井仪的核心,其通过电机提供的位置同步信号,控制超声换能器发射超声波,并采集、处理回波信息,然后把数据通过EDIB(ELIS Download Instrument Bus)总线上传至地面系统。为了检测系统能够在实验室中完整地模拟仪器工作,本文为其选择了合适的电机和电机驱动器;针对测井仪器使用的通信接口,本文完成了以FPGA为核心的通信转接板的硬件电路设计和逻辑程序设计,其实现了EDIB总线接口与USB接口转换;同时设计了检测系统便捷、统一的物理结构。为了系统地实现显控软件,本文使用了UML(Unified Modeling Language)语言对显控软件进行了需求分析、结构分析和结构设计。并且基于Python+Py Qt5平台实现了显控软件的用户界面和功能模块。其功能模块包括了通信模块、在线升级模块以及数据显示模块。然后对工程中常用的首波到时提取算法进行了研究,并实现了STA/LTA(short term averaging/long term averaging)算法用以调整测井仪器电路STA/LTA算法的参数。本文最后对检测系统的关键功能进行了测试,使用检测系统对测井仪器电路的通信功能、在线升级功能、数据采集等功能进行了验证,并对换能器进行了高温实验。通过分析对比实验结果,证明了检测系统能够完成设计需求。更多还原

【Abstract】 Ultrasonic imaging logging is an important development direction in logging technology with high imaging resolution and reflection on the borehole wall.In the process of developing CBUILT(circumferential borehole ultrasonic imaging logging tool),there will be problems in functional verification,hardware testing,software maintenance and instrument maintenance,so the design requirements of the detection system are proposed.This thesis firstly introduced the working principle of CBUILT in detail from instrument structure and logging principle;and analyed the requirements of the detection system,which is mainly used for the function verification of CBUILT’s in the preliminary development,the research of the extraction algorithm when the first wave arrive time and the testing of the ultrasonic transducer performance and other functions.Then the thesis proposed the design plan of the detection system,and divided the design of the detection system into the design of the hardware system and the design of the display and control software.The hardware system of the detection system is built around the CBUILT’s circuit.The circuit is the core of the CBUILT,which controls the ultrasonic transducer to emit ultrasonic waves through the position synchronization signal provided by the motor,and collects and processes the echo information,then uploads the data to the surface system through the EDIB bus.In order to fully simulate the work of CBUILT in the laboratory,the detection system selected a suitable motor and motor driver;for the communication interface used by CBUILT,the thesis completed the hardware circuit design of the communication adapter board with FPGA as the core.And logical programming,which implemented the conversion between EDIB bus interface and USB interface.Finally,the thesis designs a convenient and unified physical structure of the detection system.In order to systematically implement the display control software,this thesis applied UML language to perform requirement analysis,structure analysis and structure design of the display control software,and implemented the user interface and functional modules of the display control software based on Python+Py Qt5.The functional modules include communication module,online upgrade module programming,and data display module.Then,the first wave arrival extraction algorithm commonly used in engineering is studied and the STA/LTA algorithm was implemented to verify the algorithm of CBUILT.At the end of the thesis,the key functions of the detection system were tested,using the detection system to verify the communication functions,online upgrades,data acquisition and other functions of the CBUILT;and the transducer was subjected to high temperature experiments.By analyzing and comparing the experimental results,it is proved that the detection system can complete the design requirements.更多还原