驱油用耐温抗盐三元共聚物的溶液性能研究  

Solution Properties of Terpolymer NKP for EOR with Improved Temperature Resistance and Salt Tolerance

作　　者：王贵江[1] 张杰[2] 欧阳坚[1] 景宝国[3] 赵明国[3] 刘平德[1] 朱卓岩[1] 王凤[1] 

机构地区：[1]中国石油勘探开发研究院油化所,北京100083 [2]中国石油大港油田公司采油工艺研究院,天津300270 [3]中国石油辽河油田公司锦州采油厂,辽宁凌海121209

出　　处：《油田化学》2009年第2期169-171,182,共4页Oilfield Chemistry

基　　金：国家重点基础研究发展规划(973)项目"大幅度提高石油采收率的基础研究"(项目编号G19990225)

摘　　要：以丙烯酰胺、少量疏水单体N-十二烷基丙烯酰胺(AMC12)和极性单体2-丙烯酰胺基-2-甲级丙磺酸(AMPS)为原料,采用胶束水溶液共聚合方法合成了耐温抗盐三元共聚物NKP。实验研究了三元共聚物NKP的耐温抗盐性能和抗剪切性能并进行了驱油效果评价。用模拟矿化水(矿化度24500mg/L,钙镁离子665mg/L)配制浓度1500mg/L的NKP溶液,溶液黏度在80℃、剪切速率7.341/s条件下测定,可以达到25.5mPa.s,经过高速剪切后,迅速降至20.5mPa.s,静置10min后升至24.2mPa.s,保留率为95%,该溶液经过30天老化后(80℃),黏度保留率为82.8%。在80℃下非均质人造岩心驱油实验中,注入1PVNKP溶液提高采收率12.3%。与相对分子质量为2500万的HPAM相比,NKP耐温抗盐性能好,抗剪切性能优异,高温驱油效率较高。A terpolymer for EOR, notated as NKP, was synthesized from acrylamide with a little amount of hydrophohie monomer Ndodecyl acrylamide and polar monomer 2-acrylamido-2-methyl-propanesulfonic acid via micellar polymerization in aqueous medium and evaluated in laboratory for its temperature resistance, salt tolerance, and oil displacement efficiency. For an NKP solution of concentration 1500 mg/L and prepared in an artificial mineralized water of TSD =24. 5 g/L and Ca^2＋ ＋ Mg^2＋ concentration 665 rag/L, the viscosity at 80℃ and 7. 34 1/s Was determined to be of 25.5 mPa·s,dropped rapidly to 20. 5 mPa·s after intensively shearing and recovefied to 24. 2 mPa.s, i. e. 95% of its initial value, in 10 minutes of standing. This NKP solution maintained 82. 8% of initial viscosity after 30 day＇s ageing at 80℃. In an oil displacement experiment on artificial heterogeneous sandstone core at 80℃, an enhancement in oil recovery of 12.5% was observed as a result of injecting 1 PV of NKP solution. NKP showed higher temperature resistance and salt tolerance,exellent shear resistance and higher oil displacement efficiancy in comparison with a polymer HPAM of molar mass 2.5 × 107.

关 键 词：丙烯酰胺三元共聚物 水溶液 表观黏度 耐温性 抗盐性 抗剪切性 驱油聚合物 

分 类 号：TE39[石油与天然气工程—油气田开发工程] TE357.46