International Journal of Petroleum and Petrochemical Engineering (IJPPE) Volume 5, Issue 3, 2019, PP 10-16 ISSN 2454-7980 (Online) DOI: http://dx.doi.org/10.20431/2454-7980.0503002 www.arcjournals.org International Journal of Petroleum and Petrochemical Engineering (IJPPE) Page | 10 Polymer Injection Performance in Multi Porous Medium TAIWO Oluwaseun 1* , BELLO Kelani 2 , OLAFUYI Olalekan 3 Nigeria 1. INTRODUCTION The oil recovery by primary energy from the reservoirs is usually about 15 to 25 percent of the Initial Oil in place. Also, Secondary recovery techniques have also been found to further increase recovery by additional 15 to 25 percent leaving behind a recoverable oil of over 30 percent. However for viscous or heavy Oil, at the end of primary recovery, there is still 85-95% of the original oil resource left in place, furthermore, literatures show that 40% to 55% of oil reserves are usually left in-situ after primary and secondary recovery processes such as water flooding. This remaining reserve has to be recovered by Enhanced Oil Recovery processes [1, 2] . A number of enhanced oil recovery methods or processes are used to recover more Oil from the Reservoir such as thermal recovery process among which are In-Situ Combustion (ISC) or High Pressure Air Injection (HPAI), Steam/Hot water injection, Cyclic Steam Stimulation (CSS) and Steam Assisted Gravity Drainage (SAGD), also Miscible Gas Injection Process which includes First contact miscibility and Multiple contact miscibility. Another enhanced oil process is Chemical Process which involves Low IFT processes and Mobility control processes (Such as Polymer flooding, Surfactant Polymer flooding and alkaline surfactant Polymer). Polymer flooding involves the injection of viscous liquid alongside with water to improve the displacement of oil through the reservoir pore spaces. This method simply implies the control of the mobility of the injected water for better mobilisation of left behind or bypassed Oil. Polymer solutions are designed to develop a favourable mobility ratio between injected polymer solution and the oil bank being displaced ahead of the polymer. The ability of chemical of a Polymer slug to recover oil does not just depend on the rheological and elastic properties of the slug but also largely on the fluid storage capacity, the ease of fluid flow, permeability, the rock’s fluid affinity called wettability and the pore geometry of rock. These rock properties are indicative of the rock heterogeneity. Abstract: Polymer injection as come of age in Chemical enhanced or improved Oil recovery (CEOR/CIOR) over the years. The technology as grew from several experimental studies to several field applications. Numerous Researches have been performed to study the recovery potential of Polymer flooding technique in different homogenous medium such as sand packs, beads pack and some consolidated media at different conditions. But in this research attempt is been made to study the performance and behaviour of a synthetic Polymer, Hengflo 63020, in deferent porous media at the same reservoir conditions in a four series core flood experiments involving two Robu cores of different pore geometry and Properties, a Berea sandstone Core and a Bentheimer sandstone core. Result shows that at elevated temperature of 73˚C, Hengflo 63020 has a potential to recover up to 32% additional Oil in Bentheimer Sandstone of 1300md, 12% additional Oil in Berea Sandstone of 158md, 28% in a special ROBU core of permeability of 3662md and 18% in another ROBU core of permeability of 2178md. The performance of Hengflo 63020 indicates a good recovery Potential in heterogeneous reservoir with permeability variation as of the four cores used in this research. Hengflo 63020 Polymer flooding as shown to be capable of reaching a displacement efficiency of 68.182% in a sandstone reservoir at a temperature of 163˚F and this establishes the viability of a Polymer injection Oil recovery technique Keywords: Hengflo 63020, Polymer flooding, Oil recovery, Niger Delta. Viscous Oil. ROBU, Berea, Bentheimer. *Corresponding Author: TAIWO Oluwaseun, Nigeria