Nanofluids and low-salinity water（LSW）flooding are two novel techniques for enhanced oil recovery.Despite some efforts on investigating benefits of each method,the pros and cons of their combined application need to be evaluated.This work sheds light on performance of LSW augmented with nanoparticles through examining wettability alteration and the amount of incremental oil recovery during the displacement process.To this end,nanofluids were prepared by dispersing silica nanoparticles（0.1 wt%,0.25 wt%,0.5 wt% and 0.75 wt%）in 2,10,20 and 100 times diluted samples of Persian Gulf seawater.Contact angle measurements revealed a crucial role of temperature,where no wettability alteration occurred up to 80 ℃.Also,an optimum wettability state（with contact angle 22°）was detected with a 20 times diluted sample of seawater augmented with 0.25 wt% silica nanoparticles.Also,extreme dilution（herein 100 times）will be of no significance.Throughout micromodel flooding,it was found that in an oil-wet condition,a combination of silica nanoparticles dispersed in 20 times diluted brine had the highest displacement efficiency compared to silica nanofluids prepared with deionized water.Finally,by comparing oil recoveries in both water-and oil-wet micromodels,it was concluded that nanoparticles could enhance applicability of LSW via strengthening wettability alteration toward a favorable state and improving the sweep efficiency.
类型: 期刊论文
作者: Amir Hossein Saeedi Dehaghani,Reza Daneshfar
来源: Petroleum Science 2019年03期
年度: 2019
分类: 工程科技Ⅰ辑
专业: 石油天然气工业
单位: Department of Petroleum Engineering, Faculty of Chemical Engineering, Tarbiat Modares University,Department of Petroleum Engineering, Ahwaz Faculty of Petroleum Engineering, Petroleum University of Technology (PUT)
基金: support of INSF (Grant No. 96007551)
分类号: TE357.6
页码: 591-605
总页数: 15
文件大小: 1751K
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