X射线多相流检测技术研究

发布时间：2019-01-01 19:16

【摘要】：准确测量油井中多相流的参数对于了解地层信息、制定开采方案和油藏优化处理都有着重要的意义。多相流的准确测量是多年来国内外的技术难题,除需要在理论方面需要建立精确的模型外,测试手段和方法也是一项重要的内容。目前国内外常用的方法是分离法和同位素放射源测量法。为了消除分离法在体积、成本方面的缺点,以及同位素放射源对环境的辐射,本文采用了人工X射线技术检测多相流,以X射线对物质的识别能力为理论基础,采用了双能级X射线测量多相流各相的相含率。在验证该方法可行的基础上,设计了适用于多相流检测的X射线系统实现方案。研究了双能级X射线对多相流各相含率的测量原理,选用了特征谱分别为17.44keV和58.87keV的钼靶(Mo)和钨(W)靶光管作为多相流检测系统的射线源。研制了该测量系统的硬件电路,它主要包括x射线发生装置的可控电源电路模块和基于FPGA的数据采集电路模块,在完成各个电路模块调试的基础上,组装了整个测量系统,实现了适用于油气水多相流的检测。在室内试验平台上,利用所建立的X射线多相流检测系统,进行了多组试验。分析试验数据可知,测量的绝对误差不超过10%,证明了该测量系统的可行性、稳定性和准确性。
[Abstract]:Accurate measurement of the parameters of multiphase flow in oil wells is of great significance for understanding formation information, formulating production plans and optimizing reservoir processing. The accurate measurement of multiphase flow is a technical problem at home and abroad for many years. In addition to the need to establish accurate models in theory, testing methods and methods are also an important content. At present, the methods of separation and isotope radioactive source measurement are commonly used at home and abroad. In order to eliminate the disadvantages of the separation method in volume and cost, as well as the radiation of isotopic radioactive sources to the environment, this paper uses artificial X-ray technology to detect multiphase flow, which is based on the recognition ability of X ray to matter. The phase holdup of multiphase flow was measured by two-level X-ray. On the basis of verifying the feasibility of the method, an implementation scheme of X-ray system suitable for multiphase flow detection is designed. The principle of two-level X-ray measurement of phase holdup of multiphase flow is studied. Molybdenum target (Mo) and tungsten (W) target light tube with characteristic spectrum of 17.44keV and 58.87keV are selected as the ray source of multiphase flow detection system. The hardware circuit of the measurement system is developed. It mainly includes the controllable power circuit module of the x-ray generator and the data acquisition circuit module based on FPGA. On the basis of the debugging of each circuit module, the whole measurement system is assembled. The detection of oil-gas-water multiphase flow is realized. On the indoor test platform, the X-ray multi-phase flow detection system is used to carry out multi-group tests. The absolute error of the measurement is less than 10, which proves the feasibility, stability and accuracy of the system.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE31;O434.19

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