随钻中子密度测井仪测试系统设计

发布时间：2018-11-03 15:54

【摘要】：将核技术应用于井中测量,能够获取地层岩石及其孔隙流体的核物理特性,分析井的地质剖面。随钻中子密度测井仪是核测井领域重要的测井仪器,能够在石油钻井过程中获取地层的孔隙度值、密度值、PE值等重要的参数,对后期油藏储量的判断以及地层成像有着非常重要的意义。随钻中子密度测井仪具有采集控制方式复杂、工作模式多、原始能谱数据量大等特点,能够在高温、高压、高振动的环境下在井中完成数据采集及存储。为了实现仪器开发过程中上位机对测井仪井下功能模块的程序调试和在线升级,以及测井应用中的随钻数据上载,需要研制一个与随钻中子密度测井仪配套的测试系统,为其开发和测试提供有力的支持。通过对随钻中子密度测井仪功能的分析,本文设计了以“ARM+FPGA”为核心,以嵌入式软件为平台,辅之以配套的上位机控制软件的随钻中子密度测井仪测试系统。该系统既可满足随钻仪器研制时的调试需求,又可用于随钻仪器的实际测井过程。本文根据测试系统的设计目标和要求,分析研究了随钻中子密度测井仪测试系统的设计方法,并进行了系统总体框架设计。前端测试装置是实现通信协议转换的核心,论文对其硬件设计、软件设计及FPGA逻辑设计作了详细论述,实现了基于Lw IP的网络通信和基于CDC协议的USB通信,并实现了1553总线和RS485总线通信。地面测试软件是控制随钻仪器的重要平台,论文以LabWindows/CVI为地面测试软件的开发环境,利用CVI的TCP函数库、RS-232函数库分别设计并实现了网络通信、串口通信,还对地面测试软件的波形显示、数据下载以及在线升级等功能作了重点介绍。本文最后给出了测试系统的单板测试和系统联调的实验结果,实验室测试表明系统能够配合随钻仪器完成各项测试,功能指标能够满足项目的设计要求。
[Abstract]:The nuclear physical properties of formation rock and pore fluid can be obtained and the geological profile of well can be analyzed by applying nuclear technology to in-well measurement. Neutron density logging tool while drilling is an important tool in nuclear logging field. It can obtain the porosity value, density value, PE value and other important parameters in oil drilling. It is very important to judge the reservoir reserves and the formation imaging. The neutron density logging tool while drilling has the characteristics of complex acquisition control mode, more working mode and large original energy spectrum data. It can complete data acquisition and storage in wells under the conditions of high temperature, high pressure and high vibration. In order to realize the program debugging and on-line upgrading of downhole function module of logging tool by upper computer in the process of instrument development, and to upload the data while drilling in logging application, we need to develop a test system matching with the neutron density logging tool while drilling. Provide strong support for its development and testing. Based on the analysis of the function of the neutron density logging tool while drilling, a testing system of the neutron density logging tool while drilling is designed based on "ARM FPGA" as the core, with embedded software as the platform, and with the supporting host computer control software. The system can not only meet the needs of the development of drilling tools, but also can be used in the actual logging process of drilling tools. According to the design objectives and requirements of the test system, this paper analyzes and studies the design method of the testing system of the neutron density logging tool while drilling, and designs the overall framework of the system. The front-end test device is the core of realizing the communication protocol conversion. The hardware design, software design and FPGA logic design are discussed in detail. The network communication based on Lw IP and the USB communication based on CDC protocol are realized. The communication between 1553 bus and RS485 bus is realized. The ground test software is an important platform to control the instrument while drilling. The paper uses LabWindows/CVI as the development environment of the ground test software, and designs and realizes the network communication and serial communication using TCP function library of CVI and RS-232 function library respectively. The functions of waveform display, data download and online upgrade of ground test software are also introduced. In the end, the test results of single board test and system adjustment are given. The laboratory tests show that the system can complete the tests with the instrument while drilling, and the function index can meet the design requirements of the project.
【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】：TE927

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