Petrophysical characterization and chemical treatment of oil reservoir as a tool for choosing the best improved oil recovery techniques

Abstract

Abstract Enhanced oil recovery (EOR) methods are essential for maximizing oil extraction from mature reservoirs. Given the ongoing reliance on crude oil, it is essential to advance enhanced oil recovery techniques to boost reservoir production and extend their lifespan. Among the chemical EOR methods, chemical flooding is a well-established technique that can theoretically be utilized across various reservoir conditions. In this paper three novel bis (ethanethioyl) oxalamide derivatives synthesized via an eco-friendly green chemistry route using ethanol solvent at ambient temperature as chemical flooding agents. Their molecular efficacy was rationalized by quantum chemical (DFT) calculations and FTIR spectroscopy, which linked optimal interfacial activity to specific structural features. They were tested as an agent in reducing the interfacial tension (IFT) between the injected water and crude oil and also, in altering the wettability of reservoir rock. The results indicated the efficiency of the new compound (bis N) in reducing the IFT from 27 to 5 mN/m also altering the rock’s affinity for water than oil. Finally, this agent was used in chemical flooding experiments on real core plugs under reservoir conditions in terms of (temperature, pressure, and crude oil). From flooding experiments, these calculations indicate positive economics for enhanced oil recovery through this new compound where it can withstand severe reservoir conditions and achieve a recovery factor of 22.82%S or , 29.75%S or and 34.12%S or in the case of 1 g/l, 1.5 g/l and 2 g/l concentrations respectively, from the remaining oil.