原油含水率测量技术研究

发布时间：2018-03-08 08:30

本文选题：原油　切入点：含水率　出处：《西安石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：在石油开采、生产过程中,原油含水率是一项重要指标。通过实时准确测量原油含水率可以有效评估油井产能、判断和掌握油井的生产状况、追踪油井储层动态变化以及预测油井采出程度,为后续有针对性的制定开采方案、调整生产结构提供可靠依据,确保生产井始终处于最佳的生产状态。然而目前国内在原油含水率测量领域还没形成一套成体系的、可靠性较高的测量方案以及精度、准确度能够满足实际生产要求的测量方法。本论文通过对国内外现有原油含水率测量技术中的密度法、γ射线法、电容法、电导法以及近几年提出来的多模式测量法共五种测量方法的系统剖析,在对五种方法的测量原理、优缺点、适应性以及如何改进等几个方面的综合研究前提下,着力于射频法原油含水率测量技术的系统研究。选取综合了先进DDS技术的AD9850作为整个系统的信号激励源和应用于100kHz至1000MHz工作频率范围的RF功率检波器LTC5507作为整个系统的信号检测单元,并借助三维电磁仿真软件HFSS完成了射频天线的仿真及优化设计,确定了射频天线的材质、形状、尺寸以及发射频率,并对天线的馈电网络和外部保护套进行了设计。对射频法原油含水率测量系统的各个功能模块进行了联调,搭建了室内模拟试验平台和室外大型循环平台,开展了大量室内、室外试验,包括采用不同类型的试验用油、不同已知油水配比的试验用油,验证了射频天线和检测电路的稳定性、可靠性和实用性。试验结果表明,射频法原油含水率测量技术的线性误差控制在5%以内,全系统在长时间工作条件下性能稳定,有很好的实用性。
[Abstract]:The water cut of crude oil is an important index in the process of oil exploitation and production. By measuring the water cut of crude oil in real time and accurately, we can effectively evaluate the production capacity of oil well, judge and master the production condition of oil well. Tracking the dynamic change of oil well reservoir and predicting the degree of oil well production can provide reliable basis for the subsequent development plan and the adjustment of production structure. To ensure that the production wells are always in the best state of production. However, at present, there is not yet a set of systematic, reliable measurement schemes and accuracy in the field of water cut measurement of crude oil in China. In this paper, the density method, 纬 ray method, capacitance method are used to measure the moisture content of crude oil at home and abroad. Based on the systematic analysis of the electric conductivity method and the multi-mode measurement method proposed in recent years, this paper makes a comprehensive study on the measuring principle, advantages and disadvantages, adaptability and how to improve the five methods. This paper focuses on the systematic research on the measurement technology of water content of crude oil by RF method. AD9850, which integrates advanced DDS technology, is chosen as the signal excitation source of the whole system and the RF power detector LTC5507 which is applied in the frequency range of 100kHz to 1000MHz is selected as the whole system. The signal detection unit of the system, The simulation and optimization design of the RF antenna is completed with the help of three-dimensional electromagnetic simulation software HFSS. The material, shape, size and emission frequency of the RF antenna are determined. The antenna feed network and the external protective sleeve are designed. The various functional modules of the radio-frequency crude oil moisture content measurement system are combined and adjusted, the indoor simulation test platform and the outdoor large-scale circulating platform are built, and a large number of rooms are carried out. The stability, reliability and practicability of the RF antenna and the detection circuit are verified by the outdoor tests, including the use of different types of test oil and different oil / water ratios. The experimental results show that the stability, reliability and practicability of the RF antenna and the detection circuit are verified. The linear error of the radio frequency method for measuring water content of crude oil is controlled within 5%. The whole system is stable under the condition of long working hours and has good practicability.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE622.1

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