摘要
通过对活性聚合物APA-1的界面活性、乳化能力、抗剪切能力、黏弹性和驱油能力等方面的测试，探索了二元驱后应用活性聚合物APA-1进一步提高原油采收率的可行性。结果表明，活性聚合物具有比普通高相对分子质量（2500万）聚合物BH更高的增黏特性和抗钙镁离子能力，乳化增油能力更为突出，浓度为1000 mg/L的活性聚合物溶液在存放30 d后的黏度可达220 mPa·s；在钙镁离子浓度为190 mg/L时，浓度为1500 mg/L的活性聚合物溶液的黏度仍有80 mPa·s；浓度1000~1200 mg/L的活性聚合物乳化体系在放置6 h后与油完全乳化，没有水析出，性能明显优于单纯聚合物体系和二元驱体系。室内岩心驱替实验结果表明，二元驱油体系在岩心渗流过程中出现乳化的时机较早，与其相比，活性聚合物驱油体系具有显著的后程乳化特征。在二元驱的基础上，能进一步提高采收率5%~10%。
Abstract
The possibility of the application of active polymer APA-1 after binary compound flooding was probed by measurement of the interfacial tension, emulsifying ability, anti-shear ability, viscoelasticity and oil-displacement capacity of the active polymer APA-1. The results showed that the active polymer possessed more outstanding oil solubility and emulsifying ability, had better thickening behavior and stronger resistance to calcium and magnesium ions than that of the ordinary polymer BH with high molecular weight (25 million). After placed for 30 days, the viscosity of active polymer solution with the concentration of 1000 mg/L was up to 220 mPa·s. When calcium and magnesium ion content was of 190 mg/L, the viscosity of active polymer solution with the concentration of 1500 mg/L was of 80 mPa·s. After placed for 6 hours, the emulsion system obtained by mixing active polymer solution of the concentration of 1000~1200 mg/L and the crude oil was stable and without delamination. Hence, the active polymer emulsion system might be superior to the simple polymer system and binary system. The core displacement experiment showed that, compared with the binary flooding oil displacement system, active polymer flooding system had more significant late course emulsification characteristics. After binary compound flooding, the oil recovery could be further enhanced by 5%—10% by the active polymer solution.
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