论文部分内容阅读
本文考察了以十四烷氧基甜菜碱为表面活性剂的一元和SP二元复合体系在大庆油田条件下的岩心驱油效果。所用岩心为环氧树脂胶结石英砂均质(变异系数0.73)人造岩心,规格30cm×4.5cm×4.5cm;模拟油为大庆第一采油厂脱水原油和煤油配制,粘度(45℃)为10mpa·s左右。岩心水驱含水98%后分别注入1.8 PV十四烷氧基甜菜碱一元体系和1.8PV十四烷氧基甜菜碱/聚合物(聚丙烯酰胺,分子量为1200~1600万)二元体系,十四烷氧基甜菜碱表面活性剂浓度为3000 mg/L;聚丙烯酰胺浓度为1500mg/L;十四烷氧基甜菜碱两性表面活性剂一元驱油提高采收率高达9.5%,与聚丙烯酰胺复配时,具有良好的复配性且复配后的驱油效果更好,其二元体系的采收率达到15.5%,较聚驱提高3.4%,满足表面活性剂和二元复合驱油的要求。
In this paper, the core flooding effect of monobasic and SP binary systems using tetradecaboxybetaine as surfactant in Daqing oilfield was investigated. The core was made of epoxy resin cemented quartz sand with a homogenization coefficient of variation (0.73), and the size was 30cm × 4.5cm × 4.5cm. The simulated oil was prepared from dehydrated crude oil and kerosene in the No.1 Daqing Oil Production Plant. The viscosity (45 ℃) was 10mpa s or so. The core water flooding 98% water were injected into the 1.8 PV tetradecyl betaine monobasic system and 1.8PV tetradecyl betaine / polymer (polyacrylamide, molecular weight 1200-1600000) binary system, ten Tetraalkoxy betaine surfactant concentration of 3000 mg / L; polyacrylamide concentration of 1500mg / L; tetradeoxybutyl betaine amphoteric surfactant oil recovery of up to 9.5%, and polypropylene Amide complex with good compounding property and better oil displacement effect after compounding. The recovery of binary system reached 15.5%, which was 3.4% higher than that of polyacrylate, which satisfied the requirement of surfactant and binary compound flooding Oil requirements.