Energy demand is increasing worldwide because of which extraction of crude-oil from existing matured oil-field is becoming more important. In mature oil fields, the crude-oil is strongly adhered to the rock surface. To remove this oil, additional chemicals needs to be supplied. In this project, we would use molecular simulations approach to probe the detachment of crude oil from rock surfaces using injecting fluids. This computational insight allows for the design of more efficient displacement fluids, bridging the gap between theoretical chemistry and field-scale production.