阴离子双子表面活性剂驱油性能研究

对比了硫酸酯双子表面活性剂GA12-4-12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GA12-4-12与非离子表面活性剂ANT1、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,GA12-4-12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800 mg/L时,在水驱(65.38%)基础上提高采收率11.67%。GA12-4-12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2.5×105mg/L矿化度条件下,在水驱(60%)基础上,SP体系(400 mg/LGA12-4-12+100 mg/L ANT1)使渗透率为48.3×10-3μm2的低渗透率岩心提高采收率10.67%;在5×104mg/L矿化度条件下,在水驱(57.89%)基础上SP体系(400 mg/L GA12-4-12+100 mg/L ANT2)使渗透率为417×10-3μm2的中低渗透率岩心能提高采收率8.42%。

Performance of Anionic Gemini Surfactant in Enhancement of Oil Recovery

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.