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There is increasing interest in new multi-purpose chemicals for EOR in carbonate reservoirs, because of their oil wet nature that prevents oil from being produced. A new chemical compound [Et₃NH]Cl/1.5 AlCl₃ (X = 0.6) modified with CuCl, is developed for enhancing the recovery of the free imbibition and core flooding mechanisms for naturally fractured reservoirs. Laboratory experiments have been conducted to understand the injection of such chemical into oil-wet, fractured reservoirs. The compound is tested on Iranian heavy oil sample from the Bangestan reservoir, Marun oil field. Core plugs were prepared and aged in the crude to attain restored state samples. It is found that ionic liquid compound significantly reduces oil viscosity, molecular weight and also alters wettability to a more desirable state. This chemical compound has the capability of reducing IFT and contact angle. These combined effects result in …