随钻密度测井仪井下控制模块设计

发布时间：2018-07-05 04:53

本文选题：随钻密度测井 + 实时谱存储　；参考：《电子科技大学》2017年硕士论文

【摘要】：随钻密度测井仪通过伽马射线与地层相互作用所产生的康普顿效应来测得地层密度。仪器通常使用Cs137作为放射源,该放射源的能量为0.662Me V。在能量阈值很高水平的情况下,康普顿散射为主要现象。仪器的探测器所检测到的计数率由地层中的平均中子密度决定。由于仪器需要跟随钻头深入地下进行探测工作,且数据无法实时大量上传,所以需要对数据进行实时存储。本文以随钻密度测井作为测量基础,对随钻密度测井仪井下控制模块设计进行了详细的研究,包括电路的设计、软件的编写以及对功能调试的分析。随钻密度测井仪控制模块的工作任务可以分为两大类,一类是在地面调试时需要完成的任务,另一类是在井下开始测井后需要完成的任务。在地面调试时需要完成的任务有对存储模块的控制,包括存储模块的坏区查询、擦除以及读写等操作;协助控制井径电路板,包括对其进行擦除、发送参数等操作;接收上位机发送的各类参数,包括算法参数、扇区数目、同步时间等。在测井开始后需要完成的任务有对采集电路板进行控制以及接收、处理并存储由采集电路板获得的谱数据;对上位机的命令进行响应,包括实时计算结果的上传。通过对随钻密度测井仪井下控制模块所需要实现的功能进行归纳分类,明确了电路的设计思路,同时也简化了编程的复杂度。最后,验证了控制模块的所有单板功能,实现了设计要求。
[Abstract]:The density while drilling tool is used to measure the formation density by the Compton effect caused by the interaction between gamma rays and the formation. The instrument usually uses CS137 as a radioactive source, the energy of which is 0.662Me V. Compton scattering is the main phenomenon at high energy threshold. The rate of counting detected by the detector of the instrument is determined by the average neutron density in the stratum. It is necessary to store the data in real time because the instrument needs to follow the bit to probe underground and the data can not be uploaded in real time. Based on the density logging while drilling, the design of the downhole control module of the density logging tool is studied in detail, including the design of the circuit, the compilation of the software and the analysis of the function debugging. The task of the control module of density logging tool can be divided into two categories: one is the task that needs to be completed when debugging on the ground, and the other is the task that needs to be completed after the logging is started downhole. The tasks to be completed in ground debugging are to control the storage module, including the bad area query, erasure, reading and writing of the storage module, and assist in controlling the well diameter circuit board, including erasing and transmitting parameters, etc. Receive all kinds of parameters, including algorithm parameters, sector number, synchronization time and so on. The tasks to be completed after logging are to control and receive the acquisition circuit board, process and store the spectral data obtained by the acquisition circuit board, and respond to the commands of the upper computer, including the uploading of real-time calculation results. Through the classification of the functions needed for the downhole control module of the density logging tool while drilling, the design idea of the circuit is clarified and the complexity of the programming is simplified. Finally, all the single board functions of the control module are verified and the design requirements are realized.
【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】：P631.83

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