期刊
FUEL
卷 289, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2020.119928
关键词
Salinity Phase Inversion; Optimum formulation; EOR; Crude oil; Fast screening; Winsor III microemulsion
资金
- TOTAL
- Chevreul Institute
- Ministere de l'Enseignement Superieur et de la Recherche
- Region Nord-Pas de Calais
- FEDER
A novel method called dynamic Salinity-Phase-Inversion (SPI) is proposed in this study to quickly and accurately determine the optimum formulation of surfactant mixtures and anticipate whether they will exhibit a three-phase behavior (WIII) or form viscous phases. By continuously modifying the salinity of the SOW system to detect the phase inversion of the emulsion, this method significantly accelerates the optimization process, allowing for the identification of the optimal salinity within 30 minutes.
In conventional chemical Enhanced Oil Recovery (EOR), surfactant mixtures must be optimized to obtain the so-called optimum formulation characterized by a three-phase behaviour (WIII) and an ultra-low interfacial tension between crude oil and injected water. To attain this condition, discontinuous salinity scans of Surfactant Oil-Water (SOW) systems are usually performed in a series of sealed pipettes maintained at the reservoir temperature until complete phase separation. Furthermore, some SOW mixtures do not give a WIII, but instead they form viscous phases which are very detrimental for EOR applications. The study herein describes a novel method called dynamic Salinity-Phase-Inversion (SPI) to quickly and accurately determine the optimum formulation and to anticipate whether the surfactant mixture will provide, by the conventional static method, a WIII or a viscous phase. This method consists in continuously modifying the salinity of a stirred SOW system at WOR in the vicinity of 1, in order to detect the phase inversion of the emulsion by a sudden drop in conductivity. The effectiveness of the method is illustrated by seeking the optimum formulation for two crude oils in the presence of a mixture of an ionic EOR surfactant (sulfated propoxylated n-alcohol) and a nonionic co-surfactant (ethoxylated i-alcohol), with or without alkali. Continuous salinity scan of the stirred SOW system maintained at constant temperature allows the identification of the optimal salinity within 30 min. This method therefore significantly accelerates the optimization of surfactant blends suitable for a given oil reservoir.
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。
推荐
暂无数据