纳米SiO2/HPAM/NaCl分散体系的稳定性、流变性及驱油性能研究  

Stability,rheology and displacement performance of nano-SiO2/HPAM/NaCl dispersion systems

作　　者：陈五花[1,2] 王业飞[1,2] 何臻培 丁名臣[1,2] CHEN Wu-hua;WANG Ye-fei;HE Zhen-pei;DING Ming-chen(Key Laboratory of Unconventional Oil&Gas Development,China University of Petroleum(East China),Qingdao 266580,China;Shandong Key Laboratory of Oilfield Chemistry,School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)非常规油气开发教育部重点实验室,山东青岛266580 [2]中国石油大学(华东)石油工程学院山东省油田化学重点实验室,山东青岛266580

出　　处：《燃料化学学报》2020年第5期568-576,I0004,共10页Journal of Fuel Chemistry and Technology

基　　金：国家科技重大专项“大型油气田及煤层气开发”(2016ZX05058-003-003)资助。

摘　　要：利用纳米粒度及Zeta电位分析仪、流变仪和悬滴法对纳米SiO2/HPAM/NaCl体系60℃的稳定性、流变性及油水界面张力进行了研究。结果表明,HPAM的加入使SiO2悬浮液的Zeta电位更负、粒径明显增加,静置10 d无明显浑浊现象。加入纳米SiO2后,HPAM溶液的黏度增加,耐温、耐盐和耐剪切性能得到改善。对于质量分数为0.18%的HPAM溶液,SiO2质量分数小于0.5%时,随SiO2质量分数的增加,体系的黏度、储能模量和损耗模量增加,临界线性应变减小,蠕变回复能力增强;SiO2质量分数大于0.5%时,出现了相反的现象;这是因为SiO2质量分数不同时,HPAM在SiO2表面的吸附量、吸附构型及两者之间形成的网状结构不同。纳米SiO2的加入同时强化了HPAM降低油水界面张力的性能,加入质量分数为0.2%和0.5%的SiO2后,HPAM的采收率分别提高了4.5%和6.0%。The stability,rheological properties and oil/water interfacial tension of Nano-SiO2/HPAM/NaCl systems at 60℃were studied by Zetasizer,rheometer and spin-drop method,respectively.The results indicated that the zeta potential value of nano-SiO2 became more negative and the particle size was significantly increased with addition of HPAM.Meanwhile,there was no obvious turbidity phenomenon after 10 d.The nano-SiO2/HPAM suspensions had higher viscosity and the viscosity retention was improved in the presence of salt at high temperature and shear rate as compared to HPAM solution.In this work,the nano-SiO2 threshold for 0.18%(mass ratio)HPAM solution was 0.5%(mass ratio).When the mass ratio of nano-SiO2 was less than 0.5%,the viscosity,storage modulus,loss modulus and creeping recovery properties were enhanced as well as the critical strain was decreased with the increase of nano-SiO2 mass fraction.However,the opposite phenomenon was investigated when the mass ratio of nano-SiO2 was more than 0.5%.The reason for this result was that the polymer amounts,polymer conformation onto the nano-SiO2 surface and the network structure between nano-SiO2 and HPAM were different when the nano-SiO2 mass fraction was different.Oil/water interfacial tension values of nano-SiO2/HPAM suspensions were lower than that of HPAM solution,and thus with addition of 0.2%and 0.5%(mass ratio)nano-SiO2,the nano-SiO2/HPAM suspensions had ultimate oil recoveries of 4.5%and 6.0%higher than polymer flooding.

关 键 词：纳米SIO2 HPAM 黏弹性 稳定性 提高采收率 

分 类 号：TE39[石油与天然气工程—油气田开发工程]