Chloride salts of NaCl, KCl, CaCl₂, and MgCl₂ are among the essential salts examined for enhanced oil recovery (EOR) purposes through chemical injection, low salinity injection, smart water injection, etc. These salts are crucial for EOR studies since they exist in the reservoir with undeniable effects on interfacial tension (IFT), wettability alteration, etc. The alkaline injection that can produce in-situ soap leading to lower IFT values can be combined with low salinity injection method to form the hybrid EOR method. Among the different parameters in alkaline flooding, the aqueous solution pH is essential, since there is a strong relationship between the pH of the solution and crude oil type for ionization and generating in-situ soap. Whit this parameter, the current investigation concentrated on the effect of chloride-based salt (with a concentration of 5000 ppm to mimic the low salinity condition) at different pH values of 3.5, 7, and 11 in contact with heavy acidic crude oil (HACO). Since resin and asphaltene have a surfactant nature, resinous synthetic oil (8 % wt/wt) (RSO) and asphaltenic synthetic oil (8 % wt/wt) (ASO) were prepared by dissolving isolated resin and asphaltene using IP/140 procedure and examined. The results show that IFT can reduce to a value of 0.4 and 2.5 mN.m-1 for pH of 11 and DW solution if RSO and HACO utilize. The results also reveal that among the examined salts, NaCl and KCl introduce the highest impact for all types of model oils at pH values of 11, while no significant effect for pH values of 3.5 and 7 was obtained. According to these findings, it seems that injecting alkaline chemicals such as NaOH (which enhances aqueous solution pH) is an effective way to reduce the IFT values due to the in-situ surfactant generation and saponification of organic acids exited in model oils. Additionally, the IFT values show that although salts can retard the IFT reduction to some extent, no significant negative influence on the IFT reduction trends exist for the case of NaCl and KCl.

NaCl，KCl，CaCl ₂和MgCl _2的氯化物盐是通过化学注入，低盐度注入，智能注水等方法用于提高采收率（EOR）的基本盐之一。这些盐对于EOR研究至关重要，因为它们存在于储层中，对界面张力（IFT）有着不可否认的影响。可以产生原位肥皂而导致IFT值降低的碱性注射剂可以与低盐度注射剂方法结合使用，以形成混合EOR方法。在碱性驱油的不同参数中，水溶液的pH值是必不可少的，因为溶液的pH值和用于电离并产生原位肥皂的原油类型之间存在很强的关系。请使用此参数，目前的研究集中在与重酸性原油（HACO）接触的不同pH值3.5、7和11下，氯化物盐（浓度为5000 ppm以模仿低盐度条件）的影响。由于树脂和沥青质具有表面活性剂性质，因此通过使用IP / 140程序将分离的树脂和沥青质溶解，并制备树脂状合成油（8％wt / wt）（RSO）和沥青质合成油（8％wt / wt）（ASO），检查。结果表明，如果使用RSO和HACO，对于11和DW溶液的pH值，IFT可以降低到0.4和2.5 mN.m-1的值。结果还表明，在所检查的盐中，NaCl和KCl在pH值为11时对所有类型的模型油的影响最大，而在pH值为3.5和7时没有显着影响。根据这些发现，似乎注入碱性化学物质（例如NaOH）（可提高水溶液的pH值）是降低IFT值的有效方法，这是由于原位表面活性剂的产生和模型油中存在的有机酸的皂化作用。此外，IFT值表明，尽管盐可以在一定程度上延迟IFT的降低，但对于NaCl和KCl而言，对IFT降低趋势没有明显的负面影响。