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已经证实,通过几种不同的驱油机理热碱液能够提高原油的采收率、为了正确设计热碱驱,必须对高温条件下油藏矿物造成的碱耗加以考虑。本研究给出了在热碱液驱温度下,石英、高岭石和强碱进行一系列反应的实验结果。研究石英、高岭石及其混合物在120℃条件下,与0.1N的NaOH溶液的反应情况,同时研究高岭石在70℃、100℃条件下的溶解性能。结果表明,在120℃条件下,80%石英和20%高岭石(按重量计)的混合物造成的碱耗,要等于或大于这些矿物单独存在时的碱耗。纯石英溶解与混合物溶解的主要区别是碱耗机理的不同,石英溶解时,氢氧根离子是与SiO2反应而被消耗。而纯高岭石或石英与高岭石的混合物与碱反应时,形成一种新的碱酸铝矿物。使大量的碱在不可逆的反应中被消耗掉;这种新的矿物被确认为合成沸石Na-Pc。当温层从100℃升至120℃时;高岭石碱耗的速率增加5倍。依照一级动力学可以得出高岭石溶解下采的Si和Al的初始速率,在阿仑尼乌斯数据曲线得出高岭石溶解下的Si和Al的假活化能分别为8.5和1.1kCal/mole。
It has been confirmed that the recovery rate of crude oil can be enhanced by several different flooding mechanisms of hot lye. In order to properly design a hot alkali flooding, the alkali consumption caused by the reservoir minerals under high temperature conditions must be taken into consideration. This study presents the experimental results of a series of reactions of quartz, kaolinite and alkali at the temperature of hot alkali liquid flooding. The reaction of quartz, kaolinite and their mixtures with 0.1N NaOH solution at 120 ℃ was studied. The dissolution behavior of kaolinite at 70 ℃ and 100 ℃ was also studied. The results show that at 120 ° C, the alkalinity due to the mixture of 80% quartz and 20% kaolinite by weight is equal to or greater than the alkali consumption of these minerals alone. The main difference between pure quartz dissolution and mixture dissolution is the difference in the mechanism of alkali consumption. When quartz is dissolved, hydroxide ions are consumed by reacting with SiO2. Pure kaolinite, or a mixture of quartz and kaolinite, reacts with alkali to form a new type of aluminum-alkali-aluminate. A large amount of alkali is consumed in irreversible reactions; this new mineral is identified as synthetic zeolite Na-Pc. When the temperature rises from 100 ℃ to 120 ℃, the rate of kaolin alkali consumption increases 5 times. According to the first-order kinetics, the initial rates of Si and Al under kaolinite dissolution can be obtained. The Aronius data shows that the activation energies of Si and Al under kaolinite dissolution are 8.5 and 1.1, respectively kCal / mole.