双频感应测井仪测量电路设计

【作者】 邹卫华；

【导师】 师奕兵；

【作者基本信息】 电子科技大学 ， 测试计量技术及仪器， 2007， 硕士

【摘要】 测井是因石油工业为了评价油气聚集的特殊需要而发展起来的。测井可以解释为,在井内用测量装置记录所穿过的地层的特性。测井对不同人有不同的用途,对于地质学家来说,测井主要是一种地下勘探的绘图技术;对岩石物理学家来说,测井是评价储层油气生产潜力的一种方法;对于测井工程师来说,测井可能仅仅为模拟应用提供数值。电法测井经过七十多年的发展,现已成为一门独立的学科。从最初的自然电位测井,发展到了目前很受欢迎的感应测井和阵列感应测井。感应测井是一种重要的地层电阻率测量方法。伴随着感应测井仪器和理论研究的不断发展,感应测井技术也得到了更多的应用和关注。测井响应的数值模拟研究从一维模型经历二维再发展到三维复杂模型;仪器发展从传统模拟感应测井仪器经历数字相量感应测井仪器,很快发展为多频率阵列感应测井仪器。本文所涉及的双频感应测井仪是建立在波动理论和阵列感应测井仪器基础上的一种具有独创性的新型感应测井仪。它通过测量电磁场传播的两个相对值——幅度比和相位差来获得地层电阻率信息,从而达到测井的目的。本文设计研究双频感应测井仪的测量电路部分,包括数据的采集、存储和处理以及测量结果的传送。论文第一章阐述了感应测井的发展历史和国内外现状,分析了双频感应测井仪的研究意义和技术特点,给出了本文的设计任务和目标。论文第二章阐述了双频感应测井仪的理论基础和总体设计方案。论文第三章和第四章论述了测量电路的总体方案设计、硬件和软件设计,还讨论了数字相关法检测正弦信号幅度比和相位差的原理,分析了检测精度和影响精度的因素,给出了具体实现算法,仿真计算和实验结果验证了算法的可行性和有效性。论文第五章讨论了仪器下井测试的实验结果,并与俄国高频感应等参数测井仪VIKIZ进行了测井曲线对比,验证了双频感应测井仪器设计的正确性和可行性。论文第六章总结了本文的工作,得出了几点研究心得。更多还原

【Abstract】 Logging has been developing because of the special demand of oil industry for evaluating the oil storage. Logging can be explained as a log of stratum characteristics by using measurement equipment. Logging means difference for different people. For rocksy, logging is mainly a kind of underground prospecting technology. For rock physical scientist, logging is a way evaluating oil throughput. For logging engineer, maybe logging just provides numerical value for simulating applications.After over 70 years’development, electric logging has become an independent subject. Developed from the spontaneous potential logging to induction logging and array induction logging which are very popular today. Induction Logging is an important method of resistivity measurement. With the development of the foundation theory research and Induction Logging tools, Induction Logging technology is getting more and more application and attention. The numerical value simulation research of Logging response had been from one dimension to two dimensions,now to three dimensions complex model. Induction Logging Tool had developed from traditional analog one to digital vector one, and soon been to Array Phase Induction Logging Tool with several frequencies.Dual Frequency Induction Tool (DFIT in short) referred to in this thesis is a created new one which is based on the wave theory and Array Phase Induction Logging Tool. It is a resistivity logging Tool by measuring two relative parameters, Amplitude Ratio and Phase difference of the electromagnetic wave signal. Measurement circuit of DFIT is designed in this thesis, including data acquisition, data storage and processing, also data transmission. In the first chapter, the development history and status in and abroad of Induction Logging are expatiated on, the technology characteristics and research significance of DFIT are discussed, the task and target of this thesis are given. The foundation theory and the whole scheme of DFIT are expatiated on in the second chapter. In the third chapter and fourth chapter, hardware and software are designed, the principle of phase difference measurement in digital correlation method is discussed, the precision and affecting factors of phase difference measurement are analyzed, the particular arithmetic is given, both the simulations and the experiment results prove the feasibility and effectiveness of the arithmetic. In the fifth chapter, the experiment results done in the sampling well are discussed, the Logging curve is contrasted with Russian Induction Logging tool VIKIZ which is designed according to equal parameter condition. The experiment results prove the correctness and feasibility of the design. In the sixth chapter, the task of this thesis is summarized, something what I has learned is given.更多还原