摘要
为提高低渗透油藏采收率,开发了一种阴非离子型Gemini表面活性剂ANG7-Ⅳ-7,并测定体系的界面张力、乳化性能和吸附量。结果表明,ANG7-Ⅳ-7表面活性剂浓度在1~4 g/L范围内,油水界面张力均可达到10-3m N/m的超低数量级,当ANG7-Ⅳ-7浓度为4 g/L时,能使油水界面张力达到最低值6.025×10-3m N/m;在注入浓度为4 g/L时,表面活性剂在油砂上的吸附量为2.035 mg/g。室内岩心驱油试验结果表明,4 g/L的ANG7-Ⅳ-7表面活性剂驱可在水驱后提高采收率11个百分点。
In order to improve the recovery of low-permeability reservoirs,a anionic-nonionic Gemini surfactant ANG7-Ⅳ-7 was developed. The interfacial tension,emulsifying property and adsorption capacity of the system were determined. The results showed that the interfacial tension of ANG7-Ⅳ-7 was in the order of 10-3 m N/m when the concentration of ANG7-Ⅳ-7 was in the range of 1 ~ 4 g/L. When ANG7-Ⅳ-7 concentration was 4 g/L,it can make the oil-water interface tension reach the lowest value of 6. 025 ×10-3 m N/m. In addition,the adsorption amount of reservoir sand was 2. 035 mg/g when the injection concentration was 4 g/L. The core fooding test in lab showed that the oil displacement efficiency of surfactant flooding with 4 g/L of ANG7-Ⅳ-7 enhanced 11 percentage points.
引文
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