共查询到18条相似文献,搜索用时 125 毫秒
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《应用化工》2017,(6):1140-1143
采用聚焦光束反射测量仪对辽河油田稠油乳状液微粒进行"动态"监测,考察了含水率、搅拌转速和温度对稠油乳状液液滴粒径大小影响,定性分析了微观液滴分布对乳状液粘度的影响机理。结果表明,随着含水率的增大,乳状液体系中粒径显著增大,小液滴数量增大,体系黏度增大,当乳状液发生转相后,黏度大幅度降低,微观表现为小液滴数量增大,乳状液液滴平均直径增大;随着搅拌转速的增大,乳状液体系中粒径显著减小,小液滴数量增大,使得分散相更均匀的分散在连续相中,稠油乳状液黏度呈现下降的趋势;随着温度的升高,乳状液体系中粒径显著增大,小液滴数量增大,稠油乳状液液滴直径的增大,增大了体系液滴直径分布,导致乳状液体系黏度的降低。 相似文献
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以渤海SZ36-1稠油、矿化水为工质配制了2组不同液滴直径的W/O型乳状液,研究了温度、含水率、剪切率和液滴直径对乳状液黏度的影响。结果表明,温度对乳状液表观黏度的影响非常明显,而对相对黏度的影响却较小;同时含水率、剪切率和液滴直径也是影响乳状液黏度的重要因素,低含水率下,剪切率、液滴直径对黏度的影响不明显,而当含水率较高时,剪切率、液滴直径的影响非常突出,乳状液呈现出强烈的剪切稀释特性。利用国内外现有的一些黏度模型对实验获得的黏度数据进行了预测分析,发现Brinkman(1952)模型具有较好的预测精度。 相似文献
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稠油资源丰富,正在被日趋广泛开发利用,由于稠油中的胶质和沥青质使其黏度较高,导致稠油的输送异常艰难。本文主要以稠油及其乳状液为研究对象,通过实验的方法研究稠油及其乳状液的流变性,并分析含水率、矿化度、碱含量、搅拌速率等对稠油-水乳状液表观黏度的影响作用。研究结果表表明:随着温度的升高,稠油粘度会明显降低;在单因素实验中,一定程度上,碱含量对乳状液表观粘度无明显影响规律,碱含量增大,表观粘度变化幅度很小;考察了不同含水条件下乳状液的表观粘度,其影响规律为含水率越远离反相点,降黏效果较好;搅拌速率和矿化度对于稠油/水乳状液表观粘度的影响规律不显著。 相似文献
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《当代化工》2020,(6)
以国内某油田稠油及其乳状液为研究对象,采用Anton Paar MCR 302可视化流变仪对其黏温特性和流变性进行研究。测量了稠油在不同温度下的黏度,以及不同含水率、温度及剪切速率下该稠油乳状液的表观黏度,根据实验结果对其关系进行综合分析,并观察反相点附近的稠油乳状液微观形态。结果表明,该稠油的黏温特性在测量范围内能较好的符合Arrhenius方程,稠油乳状液黏度与含水率、温度的综合关系能够符合对数关系模型,在不同的含水率下,稠油乳状液黏度公式Richardson公式中的k值是关于温度的函数,从微观上可以证明该稠油样品的反相点在40%~50%之间,另外,剪切速率对稠油乳状液黏度的影响随温度的变化而变化。因此,对稠油乳化降黏输送时需考虑温度、含水率及剪切速率等多种因素的影响。 相似文献
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粘土/水分散体系的粘度方程 总被引:3,自引:0,他引:3
测定了不同分散相浓度及不同剪切速率条件下蒙脱石粘土 /水分散体系的表观粘度 ,采用将分散相浓度外推到零的方法求得分散体系的极限粘度 ,建立了体系极限粘度与分散相浓度之间关系 ,讨论了影响粘度方程的因素 相似文献
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采用海上某稠油油田原油和模拟采出水配制稠油乳状液,即模拟稠油采出液,室内开展了模拟稠油采出液的静电聚结脱水处理.结果 表明:稠油乳状液初始含水率对静电聚结脱水率有一定的影响,在相同的实验条件下,初始含水率越高,静电聚结脱水率相对越低;当稠油乳状液初始含水率为40%时,静电聚结脱水处理的最佳工艺条件为:处理温度120℃、... 相似文献
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M. Al-Yaari A. Al-Sarkhi I.A. Hussein F. Chang M. Abbad 《Chemical Engineering Research and Design》2014
In this paper, an investigation was carried out to study the effect of water fraction and flow conditions on the flow characteristics of surfactant stabilized water-in-oil emulsion. Pressure drop measurements were conducted in 2.54-cm and 1.27-cm horizontal pipes. The influence of water fraction and the flow conditions on emulsion stability, type, conductivity, droplet size distribution, viscosity and pressure drop were reported. The results showed a significant increase in the emulsion stability, viscosity and pressure drop with increasing water fraction up to 70%. In addition, shear thinning behavior was observed for the emulsions especially at high water fractions. Furthermore, pressure drop measurements of high concentrated emulsions showed pipe diameter dependency especially at high Reynolds (Re) numbers. Moreover, drag reduction was observed with decreasing water fraction. The viscosity of surfactant-stabilized water-in-oil emulsions was modeled with a modified fluidity-additivity model. 相似文献
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The effect of blocks length and molar mass of ABA triblock copolymers on the rheological behavior of water in oil (w/o) emulsions was investigated. Emulsion parameters such as water droplet concentration (and droplet size) of a series of inverted emulsion systems were evaluated. All copolymer/emulsion systems studied showed a non-Newtonian behavior, and the presence of the copolymer in the emulsion system led to an increase of the low shear viscosity when the size of the midblock of the copolymer was in a specific size range. This suggests the formation of a transient network through the interconnection, by the copolymer, of the smaller water droplets present in the emulsion. Consequently, the systems behave as w/o emulsions containing reversibly crosslinked oil-soluble polymers in the continuous phase, resulting in a pronounced shear thinning behavior. For the different emulsions studied, the relative viscosity increased, with few exceptions, with increasing droplet concentration. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
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配制了3种塔河稠油在体积含水率为0%、10%、20%、30%下的油包水乳状液。采用Anton Paar MCR302流变仪测定了乳状液在30、40、50、60、70、75℃下的粘度。基于实验数据,对9种乳状液粘度预测模型的准确性进行了评价,优选出Hatscheck模型作为乳状液粘度计算基础模型。根据计算值与实测值之间的偏差,引入温度相关项对Hatscheck模型进行了修正。结果表明,修正后的Hatschek模型的总平均相对偏差为15.11%,比修正前下降了14.85%。 相似文献
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曙光油田处于开发的中后期,高周期油井多.要提高超稠油、稠油注汽生产效果必须解决蒸汽冷凝水和稠油乳化、原油中的重质成分在岩石表面沉积、稠油降粘等问题.在注汽开采的中后期使用一定的化学处理剂,破坏稠油与水形成油包水乳状液,剥离岩石表面的油膜,降低地层流体的粘度,从而提高原油的流动性,增大油层渗透率,达到增加原油产量,提高回采水率的目的.高温反相破乳增效剂,是针对上述问题而研制的一种复合化学药剂.该药剂在现场应用效果明显,具有较大的推广使用价值. 相似文献
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油水乳化液流变性研究进展 总被引:8,自引:0,他引:8
综述了油水乳化液流变性研究进展,介绍了目前国内外乳化液流变性的研究情况、乳化液的流变模式及乳化液流变性的评价方法。乳化液的剪切应力-剪切速率关系明显受油滴尺寸的影响,在含油量一定时,表观黏度随油滴尺寸的减小而增加。绝大多数乳化液在低剪切速度下(低于50s^-1),呈现剪切变稀行为;在剪切速率超过1000s^-1时呈现牛顿行为。高含水原油的视黏度是温度、含水率以及剪切速率的函数。介绍了乳化液的3种流变模式,并给出了流变性评价方法实例。提出了油水乳化液流变性研究的发展方向。 相似文献
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以56#半精炼石蜡为黏度调节剂,制备了低熔融黏度的C-5石油树脂水基乳液,系统考察了非离子型复合乳化剂的HLB值和用量对石油树脂乳液稳定性、乳液粒径分布、乳液黏度和乳液表面张力的影响。结果表明,添加质量分数30%的石蜡可以明显降低石油树脂的熔融黏度,使物料在较低温度下实现均匀混合;复合乳化剂的最佳HLB值为10.75;最佳用量为16%。通过正交实验确定了优选乳化工艺条件为:乳化温度98℃、乳化时间20 min、剪切速率5 000 r/min、乳化水与水相的质量比为1∶3,在该条件下可制得固体质量分数为40%,稳定性好、粒径小、黏度低的O/W型C-5石油树脂乳液。 相似文献
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Ronaldo Gonçalves dos Santos Antonio Carlos BannwartMaria Isabel Briceño Watson Loh 《Chemical Engineering Research and Design》2011,89(7):957-967
This work describes the formulation and evaluation of concentrated, heavy oil-in-water emulsions stabilized by mixtures of ethoxylated surfactants and normal alcohols. The rheology, stability and droplet size of these emulsions were investigated as functions of the emulsification process parameters. The parameters investigated for this study include emulsifier agent composition, presence of additives, pH and salinity of the continuous aqueous phase, emulsification temperature, oil content and emulsion aging. The produced emulsions had viscosities ranging from 30 to 150 mPa s and represent a 30-fold reduction of the crude oil viscosity. Sauter mean diameters of the droplets ranged from 10 to 50 μm. The emulsions were produced by mixing the oil with an aqueous solution containing medium normal-chain alcohols and small quantities of a mixture of ethoxylated nonylphenol and ethoxylated amine surfactants. The presence of these alcohols led to a sharp decrease in the droplet size of the emulsion. This size decrease had a direct impact on the emulsions’ stability and apparent viscosity. The rheological parameters of the aged emulsions were also essentially constant over a 42-day period. 相似文献