中文摘要：

针对聚/表二元复合驱体系的长期热稳定性问题,在污水配制的聚合物溶液中加入非离子表面活性剂,研究其长期热稳定性及降低油水界面张力的程度。配制聚合物浓度为2 000 mg/L,非离子表面活性剂质量分数为0.10%和0.20%,在53℃无氧条件下恒温60 d。结果表明,非离子表面活性剂加入后,黏度保留率由22.3%提高到71.4%,恒温60 d后油水界面张力仍然保持在103数量级。现场采用该体系进行试注后发现,注入液可将油水界面张力降至2.59×103mN/m;在油藏条件下,溶液经60 d老化后其黏度保留率达到72%;注入井注入压力较注聚/表二元体系前上升1 MPa。

英文摘要：

To keep the thermal stability of polymer-surfactant dual-compound systems for a longer period.Some type of nonionic surfactant（0.10~0.20 wt%） is added to the polymer solution（2000 mg/L） diluted by produced water,and then,the system was aged for 60 days at 53 ℃ under the oxygen-deprived conditions.Following that,the thermal stability and the extent of reducing water-oil interface tension of the system were evaluated.The results showed that,after adding the surfactant and aging for 60 days,viscosity retention rate is improved from 22.3% up to 71.4%,and the water-oil interface tension is still within the order of 10 3 mN/m.The tentative practice which adopts this system to tentatively inject the solution combine polymer and surfactant into the reservior suggests that it reduce the water-oil interface tension down to the grade of 2.59×10 3;the viscosity of the solution remains the rate of 72%,even if the solution is kept in the same 53 ℃ for about 60 days;and the injection pressure enhances 1 MPa compared with the former conditions.