【摘要】 从油田堵水的角度出发,对镁皂石聚丙烯酰胺水凝胶体系的流变性质,以及这些性质随镁皂石浓度、聚丙烯酰胺浓度、高价阳离子、水矿化度、温度、体系流动时的剪切速率等因素的变化进行了研究。结果表明(1)若将镁皂石与聚丙烯酰胺复配,混合体系具有更加优异的流变性质,其粘度大大高于同浓度时单一体系的粘度。而且通过复配可大大降低其使用浓度;(2)通过改变镁皂石和聚丙烯酰胺的用量,可以在很大范围内调节体系粘度,以满足各种需要;(3)混合体系有较强的抗Ca2+、Mg2+能力,在试验的浓度范围,Ca2+、Mg2+对体系流变性质影响不大;(4)混合体系有良好的耐温性能,在所试验的温度范围,体系流变性质对温度不敏感;(5)混合体系具有触变性。以上性能均有利于油田堵水,因而镁皂石聚丙烯酰胺水凝胶体系可作为油田堵水剂,以代替目前常用的聚丙烯酰胺堵水剂。更多还原

【Abstract】 Rheological properties of aqueous gel of smectite polyacrylamide mixtures were studied in view of chemical water plugging in oil well. The effects of the concentration of smectite and polyacrylamide mixtures, multi valence cations, mineralized water, temperature and shear rate were discussed. Results obtained were: (1)the combination of smectite and polyacrylamide improved the rheological properties of the mixture system. The mixtures have much higher viscosity than their individual components at the same concentration, and the concentrations can be reduced by the combination of smectite and polyacrylamide; (2)viscosities of the mixtures can be adjusted by tuning the ratio of smectite to polyacrylamide; (3)there is no significant effect of Ca 2+ and Mg 2+ on the rheological properties of the mixtures, which means that the mixtures can be used in hard water; (4)the effect of temperature on the rheological properties of the mixtures is small; (5)the mixtures exhibit obvious thixotropy. All these properties are in favor of chemical water plugging in oil well. So aqueous mixtures of smectite polyacrylamide are better water shutoff agents than polyacrylamide, not only more effective, but also cheaper.更多还原