Surfactant Polymer (SP) flooding-a chemical EOR method, involves the injection of surfactants into the reservoir to reduce interfacial tension between oil and water and thus reduce capillary pressure for easy mobilization of oil. Polymers are also injected alongside to reduce mobility ratio and gather the oil droplet within the reservoir to create an oil bank and mobilize the oil towards the wellbore.In this paper, three different methods or mechanisms of implementing surfactant Polymer flooding were considered. Firstly, for Scheme or Method A, after water flooding, Sodium Dodecyl sulphate slug was injected then followed by gum Arabic slug. For Scheme B, a slug consisting of a mixture of Sodium Dodecyl sulphate and gum Arabic was injected after water flooding. In Scheme C, the core was first soaked with Sodium Dodecyl sulphate and then flooded with gum Arabic.The result showed a recovery of 56.25% of the water flooding residual oil for the first method while the other two Methods yielded displacement efficiencies of 66.12% and 64.4% respectively.In summary, the Mechanisms of implementing an SP flooding have some effects on the Oil recovery and as such care must be taken in selecting the mechanism to be adopted so as to optimize recovery.

The linear core flood (physical model) has been used severally in the past to conduct laboratory researches and experiments on Tertiary Oil Recovery. A potential pitfall of the 1D nature of the linear core flood arises during waterflooding; water channels would be blocked due to limited pathways, hence producing the additional oil before chemical consequently breaks through. In real reservoirs, there are more water pathways present; hence the relative impact of these chemical additives on incremental oil recovery is potentially overly emphasized in the laboratory. This paper presents a study on heavy oil production using chemicals in a locally fabricated 2D Hele-Shaw cell system. The 2D nature of the cell also aids the visualization of non-linear flow pathways. The experiments are run for a constant pore volume (5PV) flooding of Brine, Surfactant slug and Surfactant-Polymer (SP) slug. Recovery and digital images are taken at a minute interval each, thereby making it easier to study growth and distribution of fingers before and after water or chemical breakthrough. It was observed that after the 5PV of waterflooding, the recovery of oil from the cell reduced gradually till there was no more recovery. The Surfactant slug increased recovery by additional 21%. The more viscous Surfactant-Polymer slug gave an even improved and better recovery. This can be attributed to a clear interaction between the Surfactant and Polymer chemicals in the SP slug. The distribution of fingers between the different phases of flooding were visually observed and compared.