Due to the increase in the demand of crude oil as precursor to energy base fuels production such as gasoline, as well as petrochemicals, the oil and gas production sector is challenged on optimizing their crude oil recovery measures as a means of meeting up the advancements in the oil and gas energy sector, hence calling interest of researchers and petroleum engineers to provide possible contributive ideas. On that bases, this work focuses on the performance assessment of produced water injection efficiency in homogeneous and heterogeneous reservoir system under enhanced oil recovery (EOR) as a cost, time and material conservative measure compared to the use of water as injection fluid. Reservoir and fluid properties data were obtained from IDU- Well10 (located in Orashi area of Niger Delta, Nigeria), and they were used to model the realistic reservoir using computer modeling group (CMG) computer-based software. Reservoir fluid model was created and after defining the fluid and rock properties, the model was initialized, well configuration was implemented by placing the producers along the length of the reservoir opposite to the injector well which conveys produced water at an injection pressure of 2040 psi and fluid temperature of 120oF (48.9oC). The studied reservoir model was recurrent to operates for 10 years using the CMG-GEM simulation engine collectively with CMG-WINPROP. Results shows that produced water has an RF value of 77.9% when used as injection fluid in a homogeneous reservoir, and it will generate 143094 bbl cumulative oil volume and 100445 ft3 cumulative gas (CG) volume. While when applied to a heterogeneous reservoir system it shows a 73.9% RF value with 108851 bbl cumulative oil volume and 49654.9 ft3 cumulative gas (CG) volume achieved, which are lesser when compare to those obtained from a homogeneous reservoir system. The result depicts that a convensional homogeneous reservoir is of higher higher recovery performance. It’s recommended that produced water should rather be used as injection during crude oil recovery instead of normal sea water as it proves to be of higher recovery efficiency (>73%), this will indeed save cost, and production time which are consummed when using normal sea water as injection fluid.
Keywords: Permeability, computer modeling group (CMG), crude oil recovery, oil recovery factor, volume of oil recovered, water-cut
