CO_2驱低渗非均质油藏抗高温封窜剂的性能研究  

Performance of CO_2 Flooding Plugging Agent for Low Permeability and Heterogeneous Reservoir with High Temperature Resistance

作　　者：李凡[1] 罗跃[2] 肖清燕 丁康乐[2] 汪庐山[4] 刘承杰[4] 刘巍[4] 刘磊[2] 

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]长江大学化学与环境工程学院,湖北荆州434023 [3]湖北省兴发磷化工研究院有限公司,湖北宜昌443711 [4]中国石化胜利油田采油工艺研究院,山东东营257005

出　　处：《油田化学》2016年第1期146-150,共5页Oilfield Chemistry

摘　　要：针对高温低渗非均质油藏CO2驱普遍存在的气窜问题,研制了耐温抗盐CO2气驱封窜剂,考察了其抗盐性和封堵性。在135℃条件下,封窜剂最佳配方为:4.5%丙烯酰胺、0.2%阳离子改性剂、0.2%乳化型引发剂、0.25%甲醛、0.005%N,N'-亚甲基双丙烯酰胺和0.8%缓聚剂。其抗盐能力强,Na+、Mg^(2+)、Ca^(2+)的使用范围分别为:Na+<25 g/L、Mg^(2+)<15 g/L、Ca^(2+)<12 g/L。封堵实验结果表明,成胶时间越长,封堵率越高,成胶时间大于40 h时的封堵率约98%;随着堵剂注入量的增加,填砂管封堵率提高,注入量为0.6 PV时的封堵率可达91.5%;该堵剂有良好的选择性封堵能力,可将高渗填砂管渗透率降低92.5%。对CO2气驱的封窜能力强,可提高原油采收率11.2%。For CO2 flooding at high temperature in low permeability and heterogeneous oil reservoir, there was a problem of gas channeling. In this study, a research was carried out using a CO2 gas flooding channeling sealing agent,which had excellent property of temperature and salt resistance. The dosage of acrylamide, modifier, initiator, formaldehyde, N, N＇-methylenebisacrylamide and retarding agent was 4.5%, 0.2%, 0.2%, 0.25%, 0.005% and 0.8% in channeling sealing agent at 135℃. The application scope of positive ion Na＋, Mg2＋, Ca2＋was obtained as follows： Na＋〈25 g/L, Mg2＋〈15 g/L and Ca2＋〈12 g/L, indicating good salt resistance. The plugging experiment result showed that the longer of gelling time, the better of plugging ratio was. The plugging ratio could basically stabilize at 98% when the gelling time beyond 40 h. With increasing injection volume of channeling sealing agent, the plugging ratio of sand pack model improved. The plugging ratio could arrive 91.5% when the injection volume was 0.6 PV. The system had good performance of selectivity plugging which could reduce the permeability of high sand pack model by 92.5%. It also had strong ability for CO2 flooding and in the CO2 flooding oil displacement experiment, the oil recovery rate could be further improved by 11.2% after plugging.

关 键 词：CO2驱 高温 低渗非均质油藏 封窜剂 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程] TE357.46