非常规稠油开采用磺化疏水缔合聚合物研究

Synthesis and Evaluation of a Sulfonic Hydrophobically Associating Polymer for Enhanced Heavy Oil Recovery

为了有效地冷采非常规稠油,本文用丙烯酰胺类新型表面活性单体制备了含AMPS的疏水缔合聚合物SAP,研究了SAP溶液的黏度特性及耐温抗盐性,并进行了模型驱替稠油实验。实验结果表明:SAP聚合物的临界缔合浓度为2200mg/L;SAP溶液在浓度大于临界缔合浓度时表现出"盐增稠"现象;在80℃恒温老化90d后,SAP溶液的黏度保留率为5%。SAP驱替稠油的采收率曲线呈现S型,水驱残余油饱和度越高,疏水缔合聚合物驱替稠油越有效,使用高浓度和大段塞的SAP溶液驱替稠油增加采收率效果更好。SAP乳化了的稠油呈不连续状产出,阳离子表面活性剂十二烷基三甲基溴化铵DTAB可作为疏水缔合聚合物产出稠油的高效破乳剂。

For efficient cold production of unconventional heavy oil, a new surfactant containing sulfonic hydrophobically associating polymer SAP was synthesized, the viscosity properties and the temperature resistance and salt tolerance were investigated and the simulated displacement experiments were carried out. The results showed that the critical aggregation concentration （CAC） of SAP was 2200 mg/L. The viscosity of SAP soultion increased with the increase of salinity above CAC. The viscosity retention rate of SAP solution was only 5% after aged at 80℃ for 90 days. The displacement experiments showed that the oil recovery curve of SAP flooding belonged to S type; the higher the residual oil saturation, or the higher the SAP concentration or the larger the polymer slug size, the bigger the oil recovery of SAP flooding. The heavy oil emulsion was produce discontinuously by SAP flooding and the cationic sudactant DTAB was efficient in demulsifyiug the produce crude oil emulsion.