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首页> 外文期刊>The Canadian Journal of Chemical Engineering >Rheological Properties of Thermoviscosifying Polymers in High-temperature and High-salinity Environments
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Rheological Properties of Thermoviscosifying Polymers in High-temperature and High-salinity Environments

机译：高温高盐环境中热增粘聚合物的流变性能

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摘要

Thermo-viscosifying polymers (TVPs) are a novel class of materials developed for enhanced oil recovery (EOR) applications in high-temperature and high-salinity (HTHS) oil reservoirs. The rheological properties of the TVP-fluorocarbon surfactant and its interactions with different salts were studied. The effects of surfactant concentration, polymer concentration, salinity, and different inorganic salts on the rheological properties of the TVP and the surfactant-polymer (SP) system were evaluated. Critical association temperature (T-cass) was found to be a function of the TVP concentration and salinity. At low salinity, only thermo-thinning behaviour was observed in the entire temperature range. At high salinity, thermo-thinning was obtained in the low temperature range (T-cass)(.) The interfacial tension between crude oil and the TVP solution was reduced by 3 orders of magnitude with a combination of a fluorocarbon surfactant and a co-surfactant. About a 22 % increase in oil recovery was obtained using the TVP and the SP injection. The TVP showed much better performance and promising results in HTHS conditions compared with commercially available partially hydrolyzed polyacrylamide (HPAM). In HTHS conditions, HPAM suffers a large viscosity loss due to thermo-thinning and charge screening. On the other hand, the high viscosity of the TVP due to thermo-thickening increases oil recovery in HTHS conditions. The thermo-thickening tendency is enhanced by high temperature and high salinity, which makes it more promising for EOR.
机译：热增粘聚合物（TVP）是为提高高温和高盐度（HTHS）油藏中的采油率（EOR）应用而开发的新型材料。研究了TVP-氟碳表面活性剂的流变特性及其与不同盐的相互作用。评估了表面活性剂浓度，聚合物浓度，盐度和不同的无机盐对TVP和表面活性剂-聚合物（SP）体系流变性能的影响。发现临界缔合温度（T-cass）是TVP浓度和盐度的函数。在低盐度下，在整个温度范围内仅观察到热稀化行为。在高盐度下，在低温范围（ T-cass）进行热稠化。。碳氟化合物表面活性剂和助表面活性剂的组合为3个数量级。使用TVP和SP注入可以使采油量提高约22％。与市售的部分水解聚丙烯酰胺（HPAM）相比，TVP在HTHS条件下表现出更好的性能和令人鼓舞的结果。在HTHS条件下，由于热稀化和电荷屏蔽，HPAM的粘度损失很大。另一方面，由于热增稠，TVP的高粘度提高了HTHS条件下的采油率。高温和高盐度增强了热增厚的趋势，这使其更适合于EOR。

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