【摘要】 虑到中原文明寨油藏高温、高矿化度、高钙镁含量的特点及注入水的高ｐＨ值（８—９．５），选择含有低浓度（０．０２５％）Ｎａ２ＣＯ３的非离子表面活性剂ＮＳ溶液为驱油剂，考察了该体系与文明寨原油之间的界面张力，在天然岩心上进行了驱油实验，在水驱基础上使采收率提高了１０％和７．６％。更多还原

【Abstract】 aking into consideration hostile reservoir conditions and alkalinity of injection water (pH value 8-9.5) in Wenmingzhai Oil Fields, 0.3-0.5% NS solution in oilfield produced water containing 0.025% Na2CO3 is selected for EOR. NS is a nonionic surfactant, chemically fatty acid arkanol amide polyglycol ether. The interfacial tensions between the solution and the crude oil are investigated as influenced by NS concentration, temperature, measuring time, amout of salt (NaCl) added, and longterm standing and low values of 10-2-103 mN/m are observed at 65-80℃. In oildisplacing experiments oil recoveries are enhanced by 10.0% and 7.65 on two natural cores waterflooded to the extent of 98% water cut.更多还原