高含蜡、高凝点油藏用降凝驱油微乳液制备及性能  

Preparation and properties of pour point depression and oil displacement microemulsion for high waxy and high pour point oil reservoir

作　　者：孟勇 张卫东[1,2] 郭榕 李应成 MENG Yong;ZHANG Weidong;GUO Rong;LI Yingcheng(Sinopec Key Laboratory of Surfactants for Enhanced Oil Recovery,Shanghai 201208,China;Sinopec Shanghai Research Institute of Petrochemical Technology Company Limited,Shanghai 201208,China)

机构地区：[1]中国石化三采用表面活性剂重点实验室,上海201208 [2]中石化(上海)石油化工研究院有限公司,上海201208

出　　处：《精细化工》2025年第4期903-908,共6页Fine Chemicals

摘　　要：将阴离子表面活性剂硬脂醇聚醚羧酸钠(SEC)和阳离子表面活性剂十八烷基三甲基溴化铵(OTAB)的混合表面活性剂、聚丙烯酸酯与乙烯-醋酸乙烯酯共聚物的混合物(聚合物型降凝剂RD 5120T)和去离子水混合,制备了降凝驱油微乳液。考察了n(SEC)∶n(OTAB)对混合表面活性剂的增溶能力、m(RD 5120T)∶m(SEC+OTAB)对降凝驱油微乳液平均粒径的影响;采用凝固点测试、相态实验、增溶组分分析、界面张力测试、物模实验测试了降凝驱油微乳液的性能,并评价了其在东部某油田的现场应用。结果表明,在n(SEC)∶n(OTAB)=7∶3〔n(SEC)+n(OTAB)=1.0 mol〕、m(RD 5120T)∶m(SEC+OTAB)=1∶10、SEC(610.7 g,0.7 mol)、RD 5120T+SEC+OTAB质量浓度为200 g/L的条件下,制备的降凝驱油微乳液(微乳液-1)的平均粒径为83.64 nm,其对3种高凝原油凝固点平均降低34%以上,对原油中的长链脂肪烃(C_(18)~C_(30))具有更强的增溶能力,可将原油与水的界面张力降至6×10^(-3)mN/m。物模实验中,注入孔隙体积倍数(PV)0.2、质量浓度5 g/L的微乳液-1可提高原油采收率12.1%;现场试验中,微乳液-1可对高含蜡、高凝点油藏起到降水增油的效果,平均综合含水率(质量分数)从94.8%最低降至89.1%,平均日油从4.5 t最高提升至7.7 t。Pour point depression and oil displacement microemulsion were prepared by mixing anionic surfactant sodium stearyl ether carboxylate(SEC),cationic surfactant octadecyl trimethyl ammonium bromide(OTAB),pour point depressant polyacrylates and ethylene-vinyl acetate copolymers mixture(RD 5120T)and deionized water.The effects of n(SEC)∶n(OTAB)on the solubilization capacity of mixed surfactants and m(RD 5120T)∶m(SEC+OTAB)on the average particle size of microemulsions were investigated.The properties of the micro-emulsion were analyzed by freezing point test,phase state test,solubilizing components analysis,interfacial tension test and physical model test,with its field application in an eastern oilfield further evaluated.The results showed that,under the conditions of n(SEC)∶n(OTAB)=7∶3[n(SEC)+n(OTAB)=1.0 mol],m(RD 5120T)∶m(SEC+OTAB)=1∶10,SEC(610.7 g,0.7 mol)and mass concentration of RD 5120T+SEC+OTAB of 200 g/L,the microemulsion-1 obtained exhibited an average particle size of 83.64 nm,reduction on the freezing point of three kinds of high point crude oil by more than 34%on average,stronger solubility for long chain aliphatic hydrocarbons(C_(18)~C_(30))in crude oil,and reduction of the interfacial tension between crude oil and water to 6×10^(-3) mN/m.Physical simulation test indicated that injection of microemulsion-1 with pore volume ratio(PV)of 0.2 and mass concentration of 5 g/L could increase the oil recovery rate by 12.1%,while field experiment demonstrated that injection of microemulsion-1 could reduce water and increase oil production in high wax and high pour point reservoirs,with the average comprehensive water content(mass fraction)of the wells decreased from 94.8%to 89.1%,and the maximum daily oil production increased from 4.5 t to 7.7 t.

关 键 词：高凝油 降凝 阴/阳离子表面活性剂 微乳液 提高采收率 油田化学品 

分 类 号：TE39[石油与天然气工程—油气田开发工程]