非离子表面活性剂对污水聚合物热稳定性的影响  

Analysis of the experimental study on nonionic surfactant effect to thermal stability of polymer mixed by produced water

作　　者：陈莉[1,2] 王伟[3] 杨怀军[3] 

机构地区：[1]中国石油大学地球科学与技术学院,山东青岛266555 [2]中国石油天然气股份有限公司勘探与生产分公司,北京100007 [3]大港油田公司采油工艺研究院,天津300280

出　　处：《石油钻采工艺》2012年第2期85-88,共4页Oil Drilling & Production Technology

基　　金：国家自然科学杰出青年基金"多孔介质油气藏气湿性基础理论研究"(编号:50925414)

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。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.

关 键 词：表面活性剂 非离子 污水 聚合物热稳定性 界面张力 黏度保留率 

分 类 号：TE348[石油与天然气工程—油气田开发工程]