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为了更好地认识特稠油-水两相流动,采用显微摄像技术、等动量取样法与压降梯度测试相结合的实验方法,研究了特稠油-水两相流流型及特征。研究发现,特稠油水两相流的流型与常规油水两相流存在区别,该流型可分为Ew/o分散流、Ew/o&w间歇流、Ew/o&w分层流、Ew/o&w不完全环状流、Ew/o&w环状流、Ew/o&w环散流等6种流型,未发现Eo/w分散流。特稠油水两相流的压降梯度与流型以及油水分散状况密切相关,反相点为含水率0.60,适于在反相后输送,且反相后温度和含水率变化对压降影响较小,为特稠油以水为连续相的输送方法提供理论依据。
In order to understand the flow of extra-heavy oil-water two-phase flow, the flow pattern and characteristics of extra-heavy oil-water two-phase flow were studied by using the microscopic imaging technique, the isokinetic sampling method and the pressure drop gradient test. It is found that the flow pattern of extra-heavy oil-water two-phase flow is different from that of conventional oil-water two-phase flow. The flow pattern can be divided into Ew / o dispersed flow, Ew / o & w intermittent flow, Ew / o & w stratified flow, Complete annular flow, Ew / o & w annular flow, Ew / o & w ring flow and other six kinds of flow patterns, no Eo / w dispersed flow was found. The pressure drop gradient of the extra-heavy oil-water two-phase flow is closely related to the flow pattern and the oil-water dispersion status. The inversion point is the water content of 0.60, which is suitable for the transport after the inversion. The temperature and moisture content of the reversed- Small, especially for heavy oil to water as the continuous phase of the delivery method to provide a theoretical basis.