摘要
三元复合驱过程中,碱(A)、表面活性剂(S)和聚合物(P)与储层岩石和原油发生物理化学作用,造成部分化学剂损失,使驱油体系到达油层深部后性能大幅度降低。本文检测了三元复合体系与大庆油田一厂、四厂和六厂原油作用后,水相中碱、表面活性剂和聚合物的含量。结果表明,仅有表面活性剂和碱可以与原油作用,其中表面活性剂的分配系数为0.2率0.3,且表面活性剂在油相中的溶解是可逆的,水洗后油相中20%率30%的表面活性剂会转移到水相中。采油六厂原油中表面活性剂和碱的分配系数较大。与一厂和四厂相比,六厂原油主峰碳为C23,重质组分含量较高,碳链分布范围较广,表面活性剂更易溶解到油相中去。随油水比和搅拌作用时间增加,表面活性剂在油相中分配系数增大。在相同搅拌时间下,表面活性剂在原油中的分配系数从大到小依次为:"A/S"二元体系、表面活性剂溶液、"A/S/P"三元体系、"S/P"二元体系。
The performance of displacing agent would get worse when it flew deep into the reservoir during ASP flooding,as the physical and chemical reaction between alkaline(A),surfactant(S),polymer(P),reservoir rock and crude oil led to the loss of agent. The test on the content of alkali,surfactant and polymer in aqueous phase,after the reaction between ASP and crude oil from the 1th,4th and 6th factory of Daqing oilfield,was carried out. The results indicated that only alkaline and surfactant could react with crude oil,and the distribution coefficient of surfactant was 0.2—0.3. Furthermore the dissolution of surfactant in oil phase was reversible. 20%—30% surfactant in oil phase would transfer into aqueous phase after water washing. The distribution coefficient of surfactant and alkali in oil phase was larger in the 6th factory than that in the 1th and 4th factory. Compared with the 1th and 4th factory,the main carbon in the 6th factory was C23 with higher content of heavy component and wider distribution of carbon chain,which resulted in more likely dissolution of surfactant in oil phase. The distribution coefficient of surfactant in oil phase increased with increasing oil-water ratio and stirring time. Under the condition of same stirring time,the system was arranged according to the distribution coefficient of surfactant in crude oil in following order: A/S system,surfactant solution,A/S/P system and S/P system.
出处
《油田化学》
CAS
CSCD
北大核心
2014年第3期424-428,共5页
Oilfield Chemistry
基金
大庆油田公司重点科技攻关课题"喇嘛甸油田三元复合驱油水界面张力在油层中分布规律研究"经费资助(项目编号DQYT-0506003-2013-JS-201)
关键词
强碱三元复合体系
原油
分配系数
大庆油田
alkaline/surfactant/polymer system
crude oil
distribution coefficient
Daqing oilfield
