华北油田京11断块三元复合驱配方研究

The formula of ASP flooding for the reservoir of Jing-11 in Huabei Oil Field

针对华北油田京 11断块油藏原油黏度低、酸值低、水驱采收率高和储集层黏土含量高等特点 ,优选得到适合于该油藏的最佳低浓度弱碱三元复合体系 :2SY重烷基苯磺酸盐表面活性剂 ( 0 .15 %) Na2 CO3( 0 .5 %) SY ( 1.5 g L)。采用实验方法 ,系统研究京 11断块环境因素对该三元复合体系的界面张力性质、流变性以及表面活性剂和碱剂吸附损耗的影响 ,结果表明 :该体系对矿化度、多价金属离子浓度变化以及稀释效应等环境因素影响的耐受性较强。物理模型驱油效率试验结果表明 :在水驱至含水 98%后 ,相继注入 0 .3倍孔隙体积最佳三元复合体系主段塞和 0 .2倍孔隙体积 1.2 g L聚合物溶液保护段塞 ,可提高采收率 2 1%以上。图 3表 6参

Considering the reservoir characteristics of the Jing 11 in Huabei Oil Field (the low viscosity and low acid value of crude, high content of clay and high water flooding recovery), the interfacial tension (IFT) between the ASP system and the crude oil, the adsorption of the surfactant on the core, the loss of alkaline and the effect of the environment factor on IFT were studied. The optimum ASP formula using low concentration weak alkaline was obtained for the reservoir of Jing 11. The formula consists of 0.15%2SY alkyl benzene sulfonate, 0.5% Na 2 CO 3 and 0.15% HPAM. The experiment of physical simulation flooding shows that in the interval by rejecting 0.3PV ASP slug and 0.2 PV 1.2g/L polymer protecting slug after the 98% watercut by water flooding, the oil recovery could reached up to over 21%OOIP.