摘要
以干粉型部分水解聚丙烯酰胺(HPAM)和乳液型HPAM(EYHPAM)为聚合物驱研究对象,采用恒压法,研究了水驱后聚合物驱注入压力升高幅度受限情况下聚合物与油藏的匹配性,利用黏度、界面张力、SEM等测试方法评价了两种药剂基本理化性质,并分析了注入方式、聚合物质量浓度对匹配关系的影响及驱油机理。实验结果表明,EYHPAM为油包水型乳状液,具有速溶性,在水溶液中聚合物分子呈空间网状结构,具有较好的增黏性能、乳化分散油滴能力,洗油效率高于干粉型HPAM。相比恒速法,恒压法限制了注入压力升幅,同时引入采液速度保留率为评价指标,使室内评价结果更接近矿场实际需求。随EYHPAM质量浓度的增加,与之匹配的岩心渗透率增大,质量浓度为3000,4000,5000 mg/L时,对应匹配的岩心渗透率最低分别为182×10^(-3),254×10^(-3),303×10^(-3)μm^(2);EYHPAM作为聚合物驱时采收率增幅为15.92%,且含水率降幅较大。
Dry powder partially hydrolyzed polyacrylamide(HPAM)and emulsified HPAM(EYHPAM)were used as the research objects for polymer flooding.The compatibility between the polymer and reservoir under the condition of limited injection pressure rise after water flooding was studied using the constant pressure method.The basic physical and chemical properties of the two agents were evaluated by means of viscosity measurements,interfacial tension tests,SEM and other methods.Additionally,the effects of injection mode and polymer mass concentration on the compatibility relationship and oil displacement mechanisms were analyzed.The experimental results indicate that EYHPAM is water in oil lotion.It features good solubility,with polymer molecules forming a spatial network structure in aqueous solution.EYHPAM demonstrates excellent viscosity-increasing performance,emulsifying and dispersing oil droplet ability,resulting in higher oil-washing efficiency than dry powder HPAM.Compared to the constant velocity method,the constant pressure method limits the increase in injection pressure and introduces the retention rate of liquid collection speed as an evaluation index,making the laboratory evaluation results more reflective of the actual conditions of the mining site.As the concentration of the EYHPAM solution increases,the permeability of the matched core also increases.At concentrations of 3000,4000,5000 mg/L,the corresponding minimum permeability values of the matched core are 182×10^(-3),254×10^(-3),303×10^(-3)μm^(2).When EYHPAM is used for polymer flooding,the oil recovery increases by 15.92%,and the water content decreases significantly.
作者
何欣
卢祥国
曹伟佳
洪叙杰
王玉卿
张宝岩
HE Xin;LU Xiangguo;CAO Weijia;HONG Xujie;WANG Yuqing;ZHANG Baoyan(Key Laboratory of Enhanced Oil and Gas Recovery of Ministry of Education,Northeast Petroleum University,Daqing 163318,China;Oil Production Technology Research Institute,Daqing Oilfield Co.,Ltd.,Daqing 163453,China)
出处
《石油化工》
CAS
CSCD
北大核心
2024年第11期1611-1618,共8页
Petrochemical Technology
基金
国家自然科学基金项目(51574086)
中国石油大庆油田重点科技攻关项目(DQYT-0506003-2020-JS-323)。
关键词
乳液聚合物
恒压注入
匹配性
物理模拟
采收率
emulsion polymer
constant pressure injection
compatibility
physical simulation
recovery
