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流动体系油包水乳状液的微观特性是研究该乳化体系流变特性、析蜡特性及水合物生成特性的关键问题。基于高压水合物浆液流动环道,借助在线高倍粒度分析仪,研究不同实验条件下含水率、流动剪切速率、温度、压力等因素对水合物生成前油包水乳状液液滴微观特性的影响。结果表明:体系内含水率越小、剪切速率越大、温度越高、压力越低,油包水乳状液水滴粒径越小,分散越均匀,稳定性越好。综合温度、压力、流速、含水率、密度、黏度、表面张力、导热系数等参数对液滴粒径及分布规律的影响,建立了3种尺度范畴下油包水乳状液分散相液滴平均大小及其比例分布关系预测式,经与实验数据对比验证,预测精度在±5%以内。研究结果为基于水合物壳模型深入开展流动体系水合物生成动力学机理分析与模型预测,提供了技术支持与重要依据。
The micro-properties of the water-in-oil emulsion of the mobile system are the key issues to study the rheological properties, wax separation characteristics and hydrate formation characteristics of the emulsified system. Based on the high pressure hydrate slurry flow loop, the effects of water cut, flow shear rate, temperature, pressure and other factors on the micro-characteristics of water-in-oil emulsion droplets before hydrate formation were studied by on-line high magnification particle size analyzer . The results show that the smaller the water content in the system, the higher the shear rate, the higher the temperature and the lower the pressure. The smaller the water droplet size of the water-in-oil emulsion, the more uniform the dispersion, the better the stability. The effects of parameters such as temperature, pressure, flow rate, water content, density, viscosity, surface tension and thermal conductivity on the droplet size and distribution were studied. The average droplet sizes And the proportional relationship between the predictive formula, compared with the experimental data validation, prediction accuracy within ± 5%. The research results provide technical support and important basis for the in-depth kinetic mechanism analysis and model prediction of hydrate formation in hydrate shell based on hydrate shell model.