清洁压裂液返排液再利用驱油体系研究  

Laboratory study on surfactant flooding system based on clean fracturing flowback fluid

作　　者：周文胜[1,2] 王凯[1,2] 刘晨[1,2] 潘岳[1,2] 申健[1,2] 刘逸飞[3] 

机构地区：[1]中海油研究总院,北京100028 [2]海洋石油高效开发国家重点实验室,北京100028 [3]中国石油大学(华东)石油工程学院,山东青岛257061

出　　处：《岩性油气藏》2017年第2期160-166,共7页Lithologic Reservoirs

基　　金："十二五"国家重大科技专项"海上稠油高效开发新技术"(编号:2011ZX05024)资助

摘　　要：压裂液返排液具有液量大、处理难度大、处理费用高及环境污染等问题,为实现清洁压裂液返排液的再利用,通过对压裂液返排液体系中表面活性剂的有效质量分数、吸附性能、降低界面张力性能、改变岩石润湿性性能及提高采收率性能的室内实验评价,构建了基于清洁压裂液返排液的表面活性剂驱油体系。实验结果表明:清洁压裂液返排液体系中表面活性剂的有效质量分数为0.3%,用于目标区块脱水原油时,当其有效质量分数为0.05%~0.30%时,油水界面张力均可达到10^(-4)~10^(-3)mN/m的超低数量级;该体系改变岩石润湿性性能优良,可使油湿石英片表面向弱水湿方向转变;同时,该体系动态饱和吸附量为9.53 mg/g,且水驱后动态滞留量仅相当于动态饱和吸附量的25%~33%。室内岩心模拟驱油实验反映出,在最优注入方案条件下实现采收率增值12.5%,表明该体系能够满足目标区块压裂后进一步提高采收率的要求。Aiming at the large volumes, great treatment difficulties, high treatment cost of fracturing flowback fluid, and its harmfulness for environmental safety, the effective mass fraction, adsorption behavior, interfacial tension behavior, wettability alteration, incremental oil recovery ability and the mechanism of surfactant flood- ing were studied in laboratory, and a method was established to realize the reutilization of clean fracturing flow- back fluid in surfactant flooding. The results show that the effective mass fraction of clean fracturing flowback fluid is 0.3%. The oi/water interracial tension could be lowered to l0 4 mN/m to l0-3 mN/m with the effective mass fraction ranging from 0.05% to 0.30%. The clean fracturing flowback fluid system has excellent wettability performance and could easily change oil-wet quartz to water-wet. Meanwhile, the dynamic adsorption is about 9.53 mg/g and the dynamic retention amount is about 25%-33% of the dynamic adsorption. The physical model experiments show that the oil recovery value can be enhanced 12.5% under optimal injection project, which confirms its excellent performances on further enhanced oil recovery for the target area after fracturing treatment.

关 键 词：清洁压裂液返排液 再利用 性能评价 驱油潜力 驱油机理 

分 类 号：TE34[石油与天然气工程—油气田开发工程]