Chemical agents for enhanced oil recovery: A comparison of a switchable hydrophilic solvent and deep eutectic solvent

Fuel Communications Pub Date : 2025-01-12 DOI:10.1016/j.jfueco.2025.100133

A. Abdurrahman , S.M. Shuwa , F.N. Dabai , O.D. Orodu , F.T. Ogunkunle , A.I. Igbafe , B.Y. Jibril

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Abstract

Switchable hydrophilic solvents (SHS) and deep eutectic solvents (DES) are trending chemical agents used in enhanced oil recovery. In this study, the oil recovery performance of DES, synthesized from tetrabutylammonium bromide (TBAB) and polyethylene glycol 400 (PEG 400) in a 1:2 molar ratio, and the switchable solvent N,N-dimethylcyclohexylamine (DMCHA) was evaluated through a displacement test. Additionally, the interactions between the rock, solvents, and crude oil were investigated through interfacial tension (IFT) measurements using an Altension tensiometer. The trend in the experimental IFT results was compared to the interactions between DMCHA and oil, DMCHA and rock, DES and oil, and DES and rock using quantum mechanics calculations performed with the Spartan v20 molecular modeling tool. The findings revealed that the IFT between the solvents and oil decreased to 5.32 mN/m with DES and 2.64 mN/m with DMCHA. Furthermore, core flooding experiments showed an incremental recovery of 12.0 % of the original oil in place (OOIP) with DES and 10.0 % OOIP with DMCHA for standard Berea sandstone core samples. Similarly, flooding experiments using Niger-Delta sandstone samples achieved an additional 25.8 % OOIP with DES compared to 12.0 % OOIP with DMCHA. In conclusion, both DES and DMCHA demonstrated their potential for crude oil recovery. However, DES proved to be more promising for tertiary enhanced oil recovery applications.

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提高采收率的化学剂：可切换亲水溶剂和深共晶溶剂的比较

可切换亲水溶剂（SHS）和深共晶溶剂（DES）是提高采收率的发展趋势。本研究以四丁基溴化铵（TBAB）和聚乙二醇400 （PEG 400）为原料，以1:2的摩尔比合成了DES的采油性能，并通过置换试验评价了可切换溶剂N，N-二甲基环己胺（DMCHA）。此外，通过Altension张力仪的界面张力（IFT）测量，研究了岩石、溶剂和原油之间的相互作用。利用Spartan v20分子建模工具进行量子力学计算，将实验IFT结果的趋势与DMCHA与油、DMCHA与岩石、DES与油以及DES与岩石之间的相互作用进行了比较。结果表明，溶剂与油之间的IFT在DES和DMCHA的作用下分别降至5.32 mN/m和2.64 mN/m。此外，岩心驱油实验表明，对于标准的Berea砂岩岩心样品，使用DES和DMCHA的原始产油量（OOIP）的增量采收率分别为12.0%和10.0%。同样，尼日尔三角洲砂岩样品的驱油实验中，DES的OOIP为25.8%，而DMCHA的OOIP为12.0%。综上所述，DES和DMCHA都显示了它们的原油采收率潜力。然而，事实证明，DES在提高三次采收率的应用中更有前景。

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Fuel Communications

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