摘要
通过室内实验评价了一种新型清洁泡沫自转向酸;并利用并联岩心分流试验装置进行分流实验,研究了岩心渗透率大小、级差以及温度对清洁泡沫自转向酸转向效果的影响。实验结果表明:在170 s-1剪切速率下,初始黏度为21 mPa·s,与碳酸盐岩反应后黏度最高升至273 mPa·s。当温度小于60℃时,温度对酸液体系泡沫半衰期的影响较小;但在温度高于60℃后,泡沫稳定性迅速下降,100℃时泡沫半衰期仅为2.9 min。随着并联岩心渗透率级差的增加,低渗岩心渗透率改造率逐渐降低,转向效果下降;在相同渗透率级差下,岩心渗透率越小转向效果越差;当温度大于60℃时,该酸液体系转向效果大幅度下降。
A new clean self-diversion foam acid system was studied by experimental evaluation,and the influencing factor of it's diverting effect have been conducted by using parallel cores flow experiment,such as permeability multiple and temperature. Results show that the initial viscosity of the acid system is 21 mPa·s under the shear rate of 170 s- 1,and will highest up to 273 mPa·s after reaction with carbonate. Foam half-life of the acid system is little affected by temperature below 60 ℃. However,foam stability decreases rapidly when the temperature is higher than 60℃,and the foam half-life is only 2. 9 mins at 100 ℃. Diverting effect was gradually decreased with the permeability multiple increasing. The smaller permeability range of cores,the worse of diverting effect in the same permeability multiple. what's more,the acid fluid system diverting effect is considerable reduced when temperature is higher than 60 ℃.
出处
《科学技术与工程》
北大核心
2014年第25期183-186,共4页
Science Technology and Engineering
基金
国家科技重大专项(2011zx05031-004-003)资助
关键词
酸化
清洁
泡沫
自转向
渗透率级差
acid clean foam self-diversion permeability multiple
