表面活性剂BS复合驱油体系物理模拟实验研究  

Physical Simulation Study of Oil Displacement by Surfactant BS Combinational Flooding Fluids

作　　者：吴文祥[1] 张向宇[1] 郭明日[1] 

机构地区：[1]提高采收率国家重点实验室(大庆石油学院),大庆石油学院石油工程学院,黑龙江大庆163318

出　　处：《油田化学》2010年第1期92-95,共4页Oilfield Chemistry

基　　金：国家重点基础研究发展计划(973计划)"化学驱和微生物驱提高石油采收率的基础研究"(项目编号2005cb22130-G);国家科技重大专项项目"松辽盆地喇萨杏高含水油田提高采收率示范工程"(项目编号2008ZX05052)

摘　　要：以大庆油田使用的以重烷基苯磺酸盐Sy为表面活性剂组分的强碱ASP三元体系作对比,考察了由能使油水界面张力达到超低的两性甜菜碱表面活性剂BS配制的无碱SP二元体系和加磷酸钠牺牲剂的该SP二元体系的驱油效率。实验岩心为Ka≈1μm2的环氧树脂胶结石英砂均质、非均质(变异系数0.72)岩心。驱油实验模拟大庆油田条件(温度45℃),实验体系含表面活性剂3.0g/L,分等黏度(20,40,80mPa.s)和等聚合物浓度(0.5,1.5,2.5g/L)两个系列,化学剂主段塞0.35PV,后续聚合物保护段塞0.20PV。体系黏度由20mPa.s增至40mPa.s或聚合物浓度由0.5g/L增至1.5g/L时,均质岩心上的采收率增幅很大,黏度或聚合物浓度继续增大时增幅很小。均质岩心上的驱油效果,在等黏度条件下加牺牲剂的SP二元体系最好,SP二元体系和强碱ASP三元体系相近并较差,在等聚合物浓度条件下SP二元体系和加牺牲剂的SP二元体系最好且相近,强碱ASP三元体系较差。在非均质岩心上的驱油效果,当体系黏度为40mg/L时,加牺牲剂SP二元体系最好,SP二元体系次之,强碱ASP三元体系最差,当聚合物浓度为2.5g/L时,加牺牲剂SP二元体系与SP二元体系相当,强碱ASP三元体系较差。A plain and a phosphated SP combinational flooding fluids were prepared from amphoteric betaine surfactant BS,which was able to create ultralow interfacial tension with Daqing crude oil. The phosphated SP fluid was the plain SP fluid with sodium phosphate added as sacrificial agent at dosage 4.0 g/L. The oil displacement efficiency of the two BS containing SP fluids was investigated in comparison with an ASP flooding fluid based on heavy alkylbenzene sulfonate Sy and NaOH and used commonly in Daqing on artificial homogeneous and heterogeneous （with permeability variation coefficient 0.72） epoxy cemented quartz cores of gas permeability 1 μm2. The flooding experiments were conducted under simulation conditions of Daqing oil field and,in particular,at 45℃. All these experimental flooding fluids（EFFs） contained 3 g surfactant per liter and divided into fluids of equal viscosity（EV） of 20,40,and 80 mPa·s and of equal polymer concentration（EPC） of 0.5,1.5,and 2.5 g/L;the size of main slug of EFFs was of 0.35 PV and of postpad,polymer solution,—0.20 PV. The enhancement in oil recovery（EiOR） from homogeneous cores was significant when the viscosity of EFFs increased from 20 to 40 mPa·s or the polymer concentration of EFFs increased from 0.5 to 1.5 g/L and became much less as the viscosity or the polymer concentration was further raised. According to the EiOR from homogeneous cores the EFFs of EV were arranged in order phosphated SP 〉plain SP ≈ ASP and the EFFs of EPC— in order plain SP≈phosphated SP〉ASP. According to the EiOR from heterogeneous cores the EFFs of EV of 40 mPa·s were arranged in order phosphated SP〉plain SP〉ASP and the EFFs of EPC of 2.5 g/L —— in order phosphated SP≈plain SPASP.

关 键 词：甜菜碱衍生物 两性表面活性剂 表面活性剂/聚合物二元体系 牺牲剂 磷酸钠 岩心驱油实验 提高采收率 大庆油田 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程] TE39