基于DSP的井下模拟仪器的设计与实现

发布时间：2018-02-02 19:18

本文关键词： 测井技术仪器总线模拟方法调度算法　出处：《电子科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着测井技术的快速发展,各种新型的测井仪器相继诞生,井下仪器的组合功能越来越强,测井数据量也越来越大,加之测井作业所处的恶劣环境,对研制可靠、稳定、传输带宽大、实时性好的测井数据传输系统提出了更高的要求。在测井系统的研制过程中,通常需要挂接井下仪器才能对地面系统和遥传系统进行检测和调试。但是井下仪器原理各异,类型众多,挂接操作繁琐,耗时耗力,效率极低。因此,迫切需要设计一套能够模拟各种井下仪器的装置用于测井系统的检测及仪器设备调试。针对这一状况,本文将嵌入式技术与网络测井相结合,设计实现了一种以DSP F28335和FPGA为主要架构的嵌入式井下模拟仪器,主要用来模拟各种井下仪器的功能,用于测试测井数据传输系统的性能,以及当挂接新的井下仪器时可利用模拟仪器进行前期的功能测试。本设计提出了一种基于时间-深度驱动的数据采集方式,力图尽可能真实地模拟测井曲线。此外,考虑到真实的测井仪器一旦被研制生产出来,其接口,传输格式等就被固定下来,本文选取了工业以太网,CAN,RS-485这三种常用的测井数据传输总线,从而可以最大限度地模拟基于不同总线的测井仪器。本文详细地阐述了井下模拟仪器的设计思路以及实现过程,包括解决方案的设计,系统软硬件实现,测试平台的搭建以及测试结果分析,主要工作如下:1、研究分析了井下模拟仪器的功能要求,讨论并给出了基于F28335的井下模拟仪器的方案。2、利用OrCAD16.3和PADS2007等EDA工具,进行原理图设计,PCB绘制,实现了井下模拟仪器的硬件平台。本设计采用的芯片都是工业级高温型号,能够在井下高温环境下正常工作。3、完成了底层驱动和应用层代码的编写,包括SD驱动和FATFS文件系统的移植,三种总线接口方案的实现。4、基于现有的一套测井数据传输系统,完成了测试平台的搭建,并进行了相关的测试和调度算法的研究。本文所设计的井下模拟仪器,经过现场测试,达到了预期要求,为模拟测井及测试提供了参考。
[Abstract]:With the rapid development of logging technology, a variety of new logging tools have been born, the combination of downhole tools more and more powerful, logging data is also increasing, in addition to logging operations in a bad environment. Higher requirements are put forward for the development of a reliable, stable, large transmission bandwidth and real-time logging data transmission system. Usually, it is necessary to test and debug the surface system and remote transmission system by hanging downhole instruments. However, there are many kinds of downhole instruments with different principles, complicated hanging operation, time-consuming and labor-consuming, and extremely low efficiency. There is an urgent need to design a set of equipment to simulate various downhole tools for logging system detection and instrument equipment debugging. In view of this situation, this paper combines embedded technology with network logging. An embedded downhole simulator based on DSP F28335 and FPGA is designed and implemented, which is mainly used to simulate the functions of various downhole instruments. It can be used to test the performance of logging data transmission system and to test the function of simulation instrument when it is connected with new downhole tools. This design presents a data acquisition method based on time-depth drive. In addition, considering that once a real logging tool is developed and produced, its interface and transmission format are fixed, the industrial Ethernet can is selected in this paper. RS-485, three commonly used logging data transmission buses, can simulate logging tools based on different buses to the maximum extent. This paper describes the design idea and implementation process of downhole simulation tools in detail. Including the solution design, system hardware and software implementation, test platform construction and test results analysis, the main work is as follows: 1, studied and analyzed the functional requirements of downhole simulator. This paper discusses and gives the scheme of downhole simulation instrument based on F28335. It makes use of EDA tools such as OrCAD16.3 and PADS2007 to draw the schematic design and PCB. The hardware platform of the downhole analog instrument is realized. The chips used in this design are all industrial high temperature models, which can work normally in the underground high temperature environment. The bottom driver and the application layer code are completed. Including SD driver and FATFS file system transplantation, the implementation of three bus interface solutions. 4, based on a set of logging data transmission system, completed the construction of the test platform. The downhole simulation instrument designed in this paper has achieved the expected requirements through field tests, which provides a reference for simulation logging and testing.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.83

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