三次采油用耐温耐盐表面活性剂BHJ-2的研究

针对碳酸盐岩油藏具有高温、高矿化度的特点,研制出适合该类型油藏三次采油用耐温耐盐型表面活性剂BHJ-2。考察了其耐温耐盐性、界面活性、润湿性能、吸附性能、洗油效率、驱油效率等;结果表明,BHJ-2耐温达140℃,耐盐达2.33×10~5mg/L,吸附损失为0.574 mg/g油砂,可将油-地层水-岩石接触角由亲油性109.6°转变为亲水性61.4°。在140℃高温条件下老化30 d后,界面活性和洗油效率基本不变,油水界面张力为0.576 m N/m,静态洗油效率达到83.7%,可提高驱替效率36.7%,研究表明,BHJ-2可适用于高温高矿化度条件的亲油性碳酸盐岩油藏。

Study on the Temperature-resistant and Salt-tolerant Surfactant BHJ-2 for EOR

In view of high temperature and salt of carbonate reservoirs, a novel temperature-resistant and salt-tolerant surfactant BHJ-2 was synthesized. The temperature- resistance and salt-tolerance performance, interfacial activity, ability of changing wettability, adsorption property, washing oil property and displacement efficiency were evaluated. The results showed that BHJ-2 has capacity of temperature-resistant 140°C and salt-tolerant 2.33×105 mg/L, respectively, reduce adsorption loss to 0.574 mg/g, change oil-formation water-rock contact angle from 109.6° to 61.4°. After aging for 30 days under temperature of 140°C, the oil-water interfacial tension and washing oil efficiency of BHJ-2 were almost unchanged, interfacial tension between BHJ-2 and oil was 0.576 mN/m, washing oil efficiency under static condition was 83.7%, enhancing the displacement efficiency by 36.7%. BHJ-2 has a promising application in high temperature and salinity carbonate reservoirs with lipophilicity.