摘要
针对固体杂盐难处理、纳米颗粒制备成本高的问题,提出了以固体杂盐为原料合成纳米碳酸钙颗粒,再将其应用到纳米流体驱作为三次采油技术来提高采收率。以西南油气田川中油气矿水处理厂所提供的富含Ca^(2+),Mg^(2+)离子的固体杂盐为原料,在泡沫氛体系下合成了碳酸钙、碳酸镁混合纳米颗粒,将该纳米颗粒分散于聚丙烯酰胺溶液中形成纳米流体驱油剂并研究其驱油效果。实验结果表明:合成颗粒的平均粒径为120.9 nm、峰值粒径为111.7 nm、粒径分布为28.87~638.78 nm,颗粒表面吸附硫酸烷基侧链,接触角为93.570°;将1 g合成纳米颗粒分散于聚丙烯酰胺溶液,该纳米流体驱油剂的稳定时间大于24 h。驱替实验结果显示,当水驱含水率达80%时转注纳米流体驱油剂,此时整个体系能够形成约3 MPa的稳定驱替压差,纳米流体驱油剂的采出程度由水驱时的46.67%增至88.66%,增幅达41.99%,说明该纳米流体驱油剂具有良好的驱油性能。
The nanoparticles of calcium carbonate were synthesized from solid mixed salts to tackle the problems of difficult treatment of solid mixed salts and high preparation costs of nanoparticles,which were applied in nano-fluid flooding as the tertiary oil recovery technique to enhance oil recovery.Under the foam atmosphere system,calcium carbonate and magnesium carbonate mixed nanoparticles were synthesized from the solid mixed salts rich in Ca^(2+)and Mg^(2+)provided by the oil and gas mine water treatment plant in southwest Sichuan.The nanoparticles were dispersed in the polyacrylamide solution to form a nano-fluid flooding system,and the oil displacement effect was studied.The results show that the synthetic particles have an average particle size of 120.9 nm,a peak particle size of 111.7 nm,and a particle size distribution range of 28.87-638.78 nm.The particle surface adsorbs the side chain of alkyl sulfate,and the contact angle is 93.570°.When 1 g of synthetic nanoparticles are dispersed in the polyacrylamide solution,the nano-fluids can maintain stability for more than 24 h.In addition,displacement experiments show that when the nano-fluids are injected at a water cut of 80%,the nano-fluid flooding can form a stable displacement pressure difference of about 3 MPa.The oil recovery under the nano-fluid flooding increases to 88.66%from 46.67%under water flooding,with an increase of 41.99%,which indicates that the nano-fluid system has good oil displacement performance.
作者
唐晓东
凌思豪
李晶晶
毛乾斌
汪芳
TANG Xiaodong;LING Sihao;LI Jingjing;MAO Qianbin;WANG Fang(College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu City,Sichuan Province,610500,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2023年第4期116-122,共7页
Petroleum Geology and Recovery Efficiency
基金
中国石油天然气股份有限公司重大科技专项课题“深层稠油经济有效动用技术攻关研究”(2012E-34-06)。
关键词
固体杂盐
纳米颗粒
纳米流体
提高采收率
驱替实验
solid mixed salt
nano-particles
nano-fluids
enhanced oil recovery
displacement experiment
