摘要
针对特高温油藏,提出了一种全新的化学驱油方法一增粘型乳液增效表面活性剂驱油技术.该技术的核心是研制具有耐高温、乳化增粘和强洗油性能的增粘型乳液驱油体系,用于特高温油藏进一步提高原油采收率.为此,设计研发了以烷醇酰胺聚氧乙烯醚羧酸盐为主剂、以乳化增粘为主要功能的乳液表面活性剂CH-13,适用于90～130 ℃的高温油藏.实验结果表明：当乳液表面活性剂CH-13质量分数为2%～5%时,增溶水率随乳液表面活性剂质量分数增大而迅速增大;当水相体积小于总体积的55%时,乳液表面活性剂CH-13可以促使油水两相形成以油包水型为主的增粘型乳液,其乳化增粘率达到300%.室内物理模拟实验结果表明,多轮次交替注入乳液表面活性剂和低张力表面活性剂可提高原油采收率15.8%～20.2%.
A completely new method of chemical flooding,the viscosifying emulsion-enhanced surfactant flooding technology,was put forward for extra-high temperature reservoirs. Its core part is to develop a viscosifying emulsification flooding system with good temperature resistance property,tackifying emulsion and high displacement efficiency for EOR in the extra-high temperature reservoirs. The viscosifying emulsion-enhanced surfactant(CH-13)was designed for reservoir temperatures of 90 to 130 °C,whose main performance is tackifying emulsion and the main agent is alkanolamide polyoxyethylene ether carboxylate. The results show that water soluble index increases quickly with the increase of CH-13 mass fraction in the concentration range of 2%-5%. When the water phase volume is less than 55% of the total volume,CH-13 can promote the formation of W/O emulsion whose tackifying emulsion ratio can reach 300%. The core displacement experiment showed that the oil recovery was improved by 15.8%-20.2% when emulsification/super-low IFT surfactant solutions were injected into the system alternately for several times.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2016年第1期68-73,95,共7页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"高温高盐油田化学驱提高采收率技术"(2011ZX05011-004)
中国石化重大先导试验"纯17-1块低渗透油藏井网适配乳液表活剂驱提高采收率"
关键词
热稳定性
乳化增粘
界面张力
驱油效率
提高采收率
thermal stability
tackifying emulsion
interfacial tension
oil displacement efficiency
EOR
