纳米SiO_(2)接枝聚丙烯酰胺的黏度和流变性能  

Viscosity and Rheological Properties of Nano-SiO_(2) Grafted Polyacrylamide

作　　者：赵华强 王一彪 彭勃[1] ZHAO Huaqiang;WANG Yibiao;PENG Bo(Beijing Key Laboratory for Greenhouse Gas Storage and CO_(2)-EOR,Unconventional Petroleum Research Institute,China University of Petroleum,Beijing 102249,China)

机构地区：[1]中国石油大学(北京)非常规油气科学技术研究院温室气体封存与石油开采利用北京市重点实验室,北京102249

出　　处：《石油学报（石油加工）》2022年第6期1467-1475,共9页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：北京市科技计划项目(Z191100004619002);中国石油天然气集团有限公司-中国石油大学(北京)战略合作科技专项(ZLZX2020-01-08-04)基金资助。

摘　　要：通过对纳米SiO_(2)改性并接枝聚丙烯酰胺,制备了一种有机/无机复合的阴离子聚合物,用于油藏深部调驱进而提高原油采收率。利用激光粒度仪和红外光谱分析并验证了纳米SiO_(2)的成功改性,同时利用红外光谱验证了改性纳米SiO_(2)(MS)成功接枝聚丙烯酰胺。考察了改性纳米SiO_(2)接枝聚丙烯酰胺(MSP)含量、NaCl含量、温度和溶胀时间对MSP黏度特征和流变性能的影响。研究结果表明,在MSP质量分数0.1%~2.0%、NaCl质量浓度0~20 g/L、温度30~90℃和溶胀时间0~10 d的条件范围内:(1)MSP黏度随着MSP含量的增加而逐渐增大,随着NaCl含量的增加和温度的升高而逐渐降低,随着溶胀时间延长而逐渐增大且至7 d后基本保持不变,表现出一定的黏度稳定性;同时,MSP黏度随着改性纳米SiO_(2)含量的增加而增大,黏度由小到大顺序为MSP0、MSP1、MSP2、MSP3。(2)MSP0和MSP1的表观黏度随着MSP含量的增加和溶胀时间的延长而逐渐增大,随着温度的升高和NaCl含量的增加而逐渐降低。在较低剪切速率(γ<10 s^(-1))时,MSP0和MSP1的表观黏度随着剪切速率增大而减小,表现为剪切变稀的假塑性流体的特征;在较高剪切速率(γ>50 s^(-1))时,MSP0和MSP1的表观黏度随着剪切速率增大基本保持不变,表现为牛顿流体的特征。同时,MSP1的表观黏度在同一剪切速率下均大于MSP0,这表明改性纳米SiO_(2)的引入显著提高了MSP的表观黏度。An organic/inorganic composite anionic polymer was prepared by modifying SiO_(2) nanoparticles and grafting polyacrylamide for deep profile control and displacement of oil reservoirs,thus enhancing crude oil recovery.The successful modification of nano-SiO_(2) was analyzed and verified by laser particle size analyzer and infrared spectroscopy,and the successful grafting of modified nano-SiO_(2)(MS)with polyacrylamide was verified by infrared spectroscopy.The effects of grafted polyacrylamide(MSP)content,NaCl content,temperature and swelling time of modified nano-SiO_(2) on the viscosity characteristics and rheological properties of MSP were investigated.The results show that within the ranges of 0.1%—2.0%for MSP mass fraction,0—20 g/L for NaCl mass concentration,30—90℃for temperature and 0—10 d for swelling time:()MSP viscosity gradually increases with the increase of MSP content,gradually decreases with the increase of NaCl content and temperature,gradually increases with the extension of swelling time and basically remains unchanged until the 7th day,showing a certain viscosity stability;meanwhile,MSP viscosity increases with the increase of the content of modified nano-SiO_(2),and the viscosities are ranked in ascending order as follows:MSP0<MSP1<MSP2<MSP3.()The apparent viscosities of MSP0 and MSP1 increase gradually with the increase of MSP content and the extension of swelling time,while decrease gradually with the increase of temperature and NaCl content.At lower shear rates(γ<10 s^(-1)),the apparent viscosities of MSP0 and MSP1 decrease with the increasing shear rates,showing the characteristics of pseudoplastic fluids with shear thinning;at higher shear rates(γ>50 s^(-1)),the apparent viscosities of MSP0 and MSP1 remain basically unchanged with the increasing shear rates,showing the characteristics of Newtonian fluids.Meanwhile,the apparent viscosity of MSP1 is larger than that of MSP0 at the same shear rate,indicating that the introduction of modified nano-SiO_(2) has significantly improved

关 键 词：深部调驱 黏度特征 流变性能 假塑性流体 牛顿流体 

分 类 号：TE39[石油与天然气工程—油气田开发工程]