稠油乳化降黏吞吐技术室内模拟研究

Laboratory Simulation Study on Chemical Huff and Puff Technique of Heavy Oil Emulsified Viscosity-Reducing

本研究针对稠油开发需要,通过室内配方筛选,确定乳化降黏体系为:0.4%表面活性剂CD-1+0.2%NaOH+0.07%聚合物HPAM,在油水体积比为7∶3下形成的乳状液黏度为189.3 mPa·s,稠油降黏率达96.1%,稳定时间达48 h。将化学吞吐的方法与乳化降黏结合起来,可以取得很好的稠油开采效果,提高稠油采收率。本文通过正交试验设计,用室内物理模型模拟了稠油乳化降黏化学吞吐的过程,得到了相关吞吐工艺室内模拟参数(注入量16 mL,注入速度0.34 mL/min,焖井时间48 h,注入温度50℃),并对室内模拟吞吐效果进行分析,在水驱(采收率8.25%)基础上经过两次吞吐总共提高采收率10.78%。

Aiming at the heavy oil of a certain block of one oilfield,the emulsifying viscosity reducer system was determined through formulation screening,the system was composed of 0.4% surfactant CD-1、0.2% NaOH and 0.07% polymer HPAM. At the oil-water volume ratio of 7∶3,the viscosity of the obtained emulsion was 189.3 mPa·s,the viscosity reduction rate reached by96.1%,at the same time,the stabilization time was up to 48 h. A good heavy oil recovery effects could be achieved and heavy oil recovery could be improved by combining chemical huff and puff with emulsification viscosity reduction. The process of chemical huff and puff technique of heavy oil emulsified viscosity-reducing was simulated using laboratory physical model,and the chemical huff and puff technology parameters of indoor simulation was obtained as follows through orthogonal experiment,injection volume was 16 mL,injection rate was 0.34 mL/min,shut-in time was 48 h,and injection temperature was 50℃. Finally,the effects of indoor stimulation showed that based on water flood(oil recovery ratio was 8.25%),and the oil recovery efficiency increased by10.78% after the double chemical huff and puff process.