稠油驱油体系界面张力与驱油效率之间的关系研究  

The Relationship between Interfacial Tension and Oil Displacement Efficiency of a Surfactant Flooding Solution for Heavy Crude Oil

作　　者：王东方[1] 张贵才[2] 葛际江[2] 蒋平[2] 赵楠 裴海华[2] 

机构地区：[1]中石化胜利油田地质科学研究院,山东东营257015 [2]中国石油大学(华东)石油工程学院,山东青岛266555 [3]中海油湛江分公司,广东湛江524057

出　　处：《油田化学》2009年第3期312-315,共4页Oilfield Chemistry

基　　金：国家863项目"与蒸气吞吐结合的表面活性剂驱油体系研究"(编号2007AA06Z201);国家863项目"稠油油藏混气表面驱油技术"(编号2006AA06Z227);新世纪优秀人才计划(NECT-07-0846);山东省泰山学者计划

摘　　要：在55℃下研究了阴非离子表面活性剂9AS-5-0（壬基酚聚氧丙烯醚（5）硫酸钠盐）与胜利桩西脱水稠油之间的界面张力和驱油特性。稠油样取自桩106-15-X18井,含胶质沥青质20.54%,55℃密度0.9302 g/cm3,黏度238 mPa.s。不同盐（NaC l）浓度的2 g/L 9AS-5-0水溶液与稠油之间的动态界面张力,盐浓度0-80 g/L时随盐浓度的增大而降低,盐浓度80-120 g/L时随盐浓度增大而增大,随时间的变化幅度小均达不到超低值,盐浓度80 g/L时迅速达到超低值;60 m in时的平衡界面张力值,在盐浓度为1、60、80 g/L时分别为0.3050、0.0262、0.0014 mN/m。用这三个9AS-5-0溶液驱替渗透率3.0-4.0μm2、饱和原油的环氧树脂胶结岩心,段塞体积0.5 PV,最终采收率分别为38.99%、38.30%、36.81%,低界面张力体系的驱油效率反而较低。根据采收率、驱替压力与注入体积关系曲线,认为该表面活性剂体系是通过扩大波及体积提高稠油采收率的。The interfacial tension,IFT,with Zhuangxi＇s water free heavy crude oil and the oil displacement efficiency at 55℃ were investigated for anionic-nonionic surfactant 9AS-5-0,sodium nonylphenylpolyoxypoly oxy propylene（5）sulfate.The heavy crude oil was taken from well Zhuang-106-15-X18,containing 20.54% resin-asphatene and having at 55℃ density of 0.9302 g/cm3 and viscosity 238 mPa·s.For a series of 2 g/L 9AS-5-0 aqueous solution of varying NaCl concentration,the dynamic IFT with the crude oil decreased with increasing NaCl concentration from 0 to 80 g/L and increased with further increasing NaCl concentration from 80 to 120 g/L,changed rather slowly with time and did not reach ultralow values;ultralow values of dynamic IFT were created quickly at NaCl concentration 80 g/L;the steady values of IFT observed in 60 min for 2 g/L 9AS-5-0 solution of NaCl concentration 1,60,and 80 g/L were of 0.3050,0.0262,and 0.0014 mN/m,respectively.On epoxy cemented quartz reservoir models of permeability 3.0～4.0 μm2 with heavy crude oil saturated,injecting 0.5 PV of 2 g/L 9AS-5-0 solution with NaCl concentration 1,60,and 80 g/L resulted in an extremal oil recovery of 38.99%,38.30%,and 36.81%,respectively,which indicated a lower oil recovery for a higher IFT surfactant solution,It was considered from the relationships of oil recovery and injecting pressure vz volume injected that the oil recovery was enhanced by this surfactant flooding solution by the way of enlargement of sweeping volume.

关 键 词：壬基酚聚氧丙烯醚硫酸盐 阴非离子表面活性剂 表面活性剂/盐/水体系 界面张力 驱油效率 矿化度 稠油 表面活性剂驱 

分 类 号：TE39[石油与天然气工程—油气田开发工程] TE357.46