震电测井实验系统中采集电路研究

发布时间：2018-10-26 15:42

【摘要】：电子技术被广泛的应用到石油开采领域,推动了石油勘探和开采技术的进步。震电效应是含流体孔隙介质中机械波转换为电磁波的一种机制。这种机制提供了一种特殊的电法测井方法,也就是本文中研究的震电测井。震电测井方法相比其它测井方法,具有一些独特的优点,能够测量含流体岩层介质的多种参数,如渗透率、岩层孔隙度、流体离子浓度等等。从上世纪90年代以来,国内外针对震电测井方法做了大量原理性的研究,但由于工程应用上进展缓慢,实用的震电测井仪器至今没有面市。本文的研究内容是震电信号采集系统,它是震电测井仪器的关键组成部分。在工程应用中,震电信号采集系统需要解决三个问题:第一,震电信号采集系统要能够采集到微弱的震电信号;第二,震电信号采集系统需要分布式的采集点采集井下多个位置的震电信号;第三,震电信号采集系统需要将测井过程中产生的大量数据实时的传输到上位机。针对以上三个问题,本文提出了一种震电信号采集系统的设计方案。该震电信号采集系统基于SPI总线结构,包括数据采集板和控制通信板两部分。数据采集板分布在各个采集点,用于采集井下不同深度的震电信号。控制通信板将数据采集板采集的数据实时传输到上位机。在系统设计和调试完成后,在模拟环境中对系统的功能进行测试。本文设计的震电信号采集系统有8个采集点,用于采集井下不同位置的震电信号,并能够实时的将所有数据传输到上位机。系统的通频带为9.7kHz～37kHz,能够采集的震电信号的幅度范围为0～16.7μV。同时,由于采用了 SPI总线结构,采集点的个数能够根据实际测井需求灵活配置。经过测试,本文设计的震电信号采集系统达到了既定的设计目标,为研制震电测井仪器打下一定基础。
[Abstract]:Electronic technology is widely used in the field of oil exploration and exploitation, which promotes the progress of oil exploration and exploitation technology. Electroseismoelectric effect is a mechanism to convert mechanical waves into electromagnetic waves in fluid porous media. This mechanism provides a special electrical logging method, which is the seismoelectric logging studied in this paper. Compared with other logging methods, seismoelectric logging has some unique advantages, such as permeability, reservoir porosity, fluid ion concentration and so on. Since the 1990s, a large number of theoretical studies have been done on seismoelectric logging methods at home and abroad. However, due to the slow progress in engineering applications, practical seismoelectric logging tools have not been available yet. The research content of this paper is the acquisition system of seismoelectric signal, which is the key component of seismoelectric logging tool. In the engineering application, three problems need to be solved in the seismic signal acquisition system: first, the seismic signal acquisition system should be able to collect weak seismic signal; Second, the seismic signal acquisition system needs distributed acquisition points to collect seismic signals from multiple locations in the downhole. Thirdly, the seismic signal acquisition system needs to transmit a large number of data generated in the logging process to the upper computer in real time. In view of the above three problems, this paper puts forward a design scheme of seismic signal acquisition system. The system is based on SPI bus structure, including data acquisition board and control communication board. The data acquisition board is distributed in various acquisition points and is used to collect seismic signals at different depths. The control communication board transmits the data collected by the data acquisition board to the upper computer in real time. After the system is designed and debugged, the function of the system is tested in the simulation environment. The system designed in this paper has 8 acquisition points, which is used to collect seismic signals at different positions and can transmit all the data to the upper computer in real time. The frequency band of the system is 9.7 kHz ~ 3 ~ 37 kHz, and the amplitude of the seismoelectric signal can be collected in the range of 0 ~ 16.7 渭 V. At the same time, because of the SPI bus structure, the number of acquisition points can be flexibly configured according to the actual logging requirements. After testing, the design of the seismoelectric signal acquisition system in this paper has reached the established design goal, which lays a foundation for the development of seismoelectric logging tools.
【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】：P631.81;TP274.2

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