中等原油油包水乳剂的流变学

R. Issa, Emily Hunt
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引用次数: 3

摘要

对原油包水乳状液的流变性进行了实验研究。以API比重为29.6,重量硫含量为1.97%的中等原油为实验对象,在室温下进行了实验。用淡水和盐水(3.8% NaCl w/v)制备乳状液样品。水的浓度从5%到60%不等。试验表明,原油含水乳状液表现出剪切增稠的非牛顿行为。用淡水制备的乳液粘度随着水浓度的增加而增加,直到发生相转变,之后粘度下降,然后趋于平稳。然而,对于用盐水制备的乳液,随着水浓度的增加,粘度继续增加,超过相反转点。在相同的水浓度下,淡水乳状液的粘度比盐水乳状液要低,可以吸收30%的水,而盐水乳状液只能吸收15%的水。这些乳剂被归为中稳定型,其粘度的增加比起始油的增加少一个数量级。水的盐度导致油乳的非牛顿行为略有增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Rheology of water-in-oil emulsions for a medium crude oil
An experimental study was conducted to investigate the rheology of water-in-crude oil emulsions. Experiments were carried out on a medium crude oil (API gravity of 29.6, and 1.97% by weight sulfur content) at room temperature. Emulsion samples were prepared using fresh and salt water (3.8% NaCl w/v). The water concentration ranged from 5% to 60% by volume. Tests revealed that water-in-crude oil emulsions showed a shear thickening non-Newtonian behavior. Emulsions prepared using fresh water showed an increase in the emulsion viscosity as water concentration increased until phase inversion occurred, after which the viscosity dropped and then leveled out. However, for emulsions prepared using salt water, viscosity continued to increase beyond the phase inversion point with the increase in water concentration. For the same water concentration, fresh water emulsions had lower viscosity than salt water emulsions and were able to take up to 30% water, while salt water emulsions were able to take up to 15% water only. The emulsions, classified as meso-stable, showed a viscosity increase of less than one order of magnitude greater than that of the starting oil. Water salinity caused a slight increase in the non-Newtonian behavior of the oil emulsions.
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