阴离子双子表面活性剂驱油性能研究

Performance of Anionic Gemini Surfactant in Enhancement of Oil Recovery

胡小冬唐善法刘勇文守成闫双喜

HU Xiao-Dong TANG Shan-Fa LIU Yong WEN Shou-Cheng YAN Shuang-Xi

对比了硫酸酯双子表面活性剂GAl2-4—12与十二烷基硫酸钠的油水动态界面张力及驱油效果，研究了GAl2-4．12与非离子表面活性剂ANTl、ANT2复配体系在不同渗透率和不同矿化度条件下的驱油性能。结果表明，GAl2-4．12具有优于单链表面活性剂的界面活性和提高采收率能力，使用浓度仅为800mg／L时，在水驱（65．38％）基础上提高采收率11．67％。GAl2-4．12能适用于中、低渗油藏，其提高采收率的能力随着矿化度的增加而逐渐下降。复合驱替实验表明，在2．5×10^5mg／L矿化度条件下，在水驱（60％）基础上，sP体系（400mg／LGAl2-4．12＋100mg／LANTl）使渗透率为48．3×10^-3lava2的低渗透率岩心提高采收率10．67％；在5×10^4mg,／L矿化度条件下，在水驱（57．89％）基础上SP体系（400mg／LGAl24-12＋100mg／LANT2）使渗透率为417×10^-3μm^2。的中低渗透率岩心能提高采收率8．42％。图1表5参6

The dynamic interfacial tension of oil-water and the displacement effect of anion Gemini surfactants GA12-4-12 and dodecyl sulfate sodium were contrasted,and the displacement effect of the compound of GA12-4-12 and non-ionic surfactant ANT1,ANT2 was investigated in different permeability and salinity condition.The results showed that GA12-4-12 possessed superior interfacial activity and ability to enhance the oil recovery,especially when the concentration of CA12-4-12 was 800 mg/L,the enhancement of oil recovery was 11.67% based on 63.38% of water flooding.GA12-4-12 was suitable for medium and low permeability reservoirs,however,the ability to enhance the oil recovery gradually declined with increasing salinity.Compound oil displacement experiments showed that in 2.5 ×105 mg/L salinity conditions,the oil recovery of low permeability cores of 48.3×10-3 μm2 was enhanced by the SP1 system(400 mg/L GA12-4-12+100 mg/L ANT1) for 10.67% based on 60% of water flooding;in 5×104 mg/L salinity conditions,the oil recovery of middle-low permeability cores of 417×10-3 μm2 was enhanced by the SP2 system(400 mg/L GA12-4-12+100 mg/L ANT2)for 8.42% based on 57.89% of water flooding.