适用于高温高矿化度条件的聚乙烯亚胺冻胶堵水剂  

Water shutoff agent of PEI gel applicable to high temperature and high salinity reservoirs

作　　者：吴运强 毕岩滨[2] 纪萍[3] 汪进 贾寒[4] 周洪涛[4] 

机构地区：[1]新疆油田分公司实验检测研究院,新疆克拉玛依834000 [2]中海油能源发展股份有限公司采油技术服务分公司,天津300457 [3]新疆油田公司采油一厂,新疆克拉玛依834000 [4]中国石油大学(华东)石油工程学院,山东青岛266555

出　　处：《石油钻采工艺》2015年第4期113-116,共4页Oil Drilling & Production Technology

摘　　要：针对高温高矿化度地层堵水需求,研制了一种耐高温高矿化度的以阴离子聚丙烯酰胺为主剂的冻胶型堵剂,交联剂采用水溶性聚合物聚乙烯亚胺（PEI）,并加入保护剂减缓高温下主剂的水解.实验考察了主剂质量分数、主剂分子量、PEI 质量分数、PEI 分子量、矿化度和pH 值等因素对PEI 冻胶成胶性能的影响.实验结果表明：随着主剂和PEI 相对分子质量增加,主剂和PEI 质量分数的增加,成胶时间缩短,但交联剂质量分数过高易发生过交联现象,造成冻胶过早脱水;成胶时间随着pH 值的增加而缩短,随矿化度的增加而变长.在110 ℃条件下,对于NaCl 含量为50 000 mg/L 的地层水,该冻胶强度高,耐温性好,封堵效果好且至少120 d 不脱水.堵剂体系最佳配方为：0.6%~0.8% 阴离子聚丙烯酰胺＋0.3%~0.7%PEI＋0.8%~1% 高温保护剂.A gel type shutoff agent with anionic polyacrylamide as a main agent required for high temperature and high salinity formation water shutoff was developed using a crosslinking agent of water soluble polymer-polyethylenimine (PEI), and protective agent was added to slow down hydrolysis of the main agent under high temperature. The impact of main agent mass fraction, main agent molecular weight, PEI mass fraction, PEI molecular weight, salinity and pH was experimentally investigated on gelling performance of PEI gel. Experimental results show that the relative molecular weights of main agent and PEI increase as the mass fraction of main agent and PEI increases while the gelation time is shortened. But under high mass fraction, excessive crosslinking is more likely to occur, causing premature gel dehydration. The gelation time is shortened with the increase of pH values, and becomes longer with the increase of salinity. At 110℃, for formation water with NaCl content of 50 000 mg / L, the gel shows high strength and good resistance to temperature and good blocking effectiveness, and remains hydrated for at least 120 days. The optimum formula for water shutoff system is 0.6% to 0.8% anionic polyacrylamide & 0.3% to 0.7% PEI & 0.8% to 1% high temperature protective agent.

关 键 词：聚乙烯亚胺冻胶 成胶时间 高温高矿化度 阴离子聚丙烯酰胺 堵水剂 

分 类 号：TE358[石油与天然气工程—油气田开发工程]