基于文丘里与电容层析成像技术的油-气流动静压分布研究

Oil-gas flow is regarded as a common type of gas-liquid two-phase flow in oil and gas industries. Measuring accurate flow rates of a two-phase flow in a non-separated procedure, has always been one of the most important goals that engineers have been striving to accomplish. At present, Venturi has become an effective technique typically used for gas-liquid flow measurements in industry. There has been a consensus that the static pressure distribution of oil-gas two-phase flow in Venturi forms the foundation for establishing the measurement model which can determine the two phases flow rate simultaneously. This study aims to explore the dynamics characteristics of oil-gas flow in Venturi. By using Electrical Capacitance Tomography to detect the two-phase flow information in different cross-sections of Venturi, and combining the Venturi pressure test results of the real flow experiments to be conducted in a relatively wide range of test conditions, the model will be developed for determining the static pressure distribution in Venturi. In addition, the forming mechanism of the oil-gas flow static pressure distribution will be demonstrated by applying the two-phase flow dynamics theories and analyzing the space evolutionary process of the flow details information such as void fraction at the cross-sections in Venturi.

油-气流动属石油与天然气工业中常见的气-液两相流动。在非分离条件下，对其两相流量进行准确计量一直是工业界努力实现的重要目标。文丘里目前已成为工业中对气-液两相流计量的常用设备，而油-气两相流动在文丘里管中的压力分布规律，无疑是建立机理性文丘里两相流量计量模型的基础。本研究以探索油-气两相在文丘里中的流动特性为目标，通过电容层析成像技术检测文丘里不同关键部位的两相截面信息，结合宽泛工况下的实流实验压力测量，建立一套从入口处两相流量及压力温度等宏观边界条件推导文丘里两相静压分布的模型。同时以两相流体动力学理论为指导，通过分析文丘里不同截面上两相分布等流动细节信息的空间演化规律，阐明油-气两相在文丘里中静压分布的形成机理。

油-气流动属石油与天然气工业中常见的气-液两相流动。在非分离条件下，对其两相流量进行准确计量一直是工业界努力实现的重要目标。文丘里目前已成为工业中对气-液两相流计量的常用设备，而油-气两相流动在文丘里管中的压力分布规律，无疑是建立机理性文丘里两相流量计量模型的基础。本研究运用两相流理论对气-液流动中的气相与液相流动进行分析，在分层流与环雾状流的条件下推导了湿气通过水平标准文丘里流量计的理论模型。以油-水两相流动为研究对象，使用电容层析成像技术，在水平与竖直条件下，对的油-水两相流动中的含水率进行检测，为文丘里计算流量时的液相混合密度提供计算依据。同时提供了一种在非分离条件下对油-水混合流动进行实时计量的方案。本研究以两相流体动力学理论为指导，分析了文丘里不同截面上两相分布等流动细节信息的空间演化规律，为建立能够同时计量油-气-水多相流量的机理性方法提供理论与实验参考。