4.7 Article

Investigation of cation-assisted, chemically and thermally enhanced nitrogen-doped graphene nanofluid application as an efficient micro-emulsifier from EOR perspective

期刊

FUEL
卷 335, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.127033

关键词

Nitrogen -doped graphene; Enhanced oil recovery; Micro -emulsion; Emulsification mechanism; Cations

向作者/读者索取更多资源

In the past decade, innovative additives have been introduced for enhanced oil recovery (EOR) processes to improve efficiency under challenging conditions. Nitrogen-doped graphene (NDG) has been utilized as a stable and efficient injection method. Treatments have been applied to enhance the stability and quality of the commonly used nitrogen-doped graphene aqueous solution, involving nano-structure modification and carrier fluid properties. The resulting NDG functionalization and structure enhancement have shown improved emulsion stability and solubility, making it a superior option for EOR process.
Innovatively designed additives have been introduced in last decade to make EOR processes more efficient under challenging conditions. However, nitrogen-doped graphene (NDG) is not known as such a stable efficient method to be injected into reservoir under harsh thermodynamic condition. Some treatment has been applied to molecular structure of commonly used nitrogen-doped graphene aqueous solution for improvement of stability and quality of aqueous solution. These treatments involve both nano-structure and the aqueous carrier fluid properties. Nano-structure modification has been conducted in three successive steps: oxidation with acid vapor and modified Hummers method, citric acid polymerization and heat treatment that succeed in NDG functionalization with carboxyl and hydroxyl groups and structure enhancement in molecular scale. Existing free mono- and divalent cations in aqueous carrier phase improve the emulsification dominant mechanism from Pickering unstable emulsion toward more stable micro-emulsion mechanism which appeared to be superior to conventional emulsifiers used in EOR process because of improved solubility and more facile transport through porous media. Zeta potential of solution has increased from -30 to -12.2 mV highlighting more emulsion stability. The interfacial tension between aqueous fluid containing 500 ppm APH-NDG1 and free mono- and divalent cations and crude oil would be 50 % less in comparison to distilled water/crude oil IFT. Furthermore, APH-NDG, regardless of carrier aqueous type, causes a great decrease in contact angle and as a result, makes the rock surface become more water-wet.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据