Economic Co-optimization of Oil Recovery and CO2 Sequestration

Klaas van 't Veld, Xiao Wang, Vladimir Alvarado
2014 SPE Annual Technical Conference and Exhibition   unpublished
The objective of this project is to maximize oil recovery and the total stored CO2. Continuous CO2 flooding case was used in this project as a base case reference to evaluate the different approaches in enhancing oil recovery and increasing the stored CO2. Carbonated water injection (CWI) was suggested in literature to solve the possible lack of available CO2 sources; however carbonated water requires special transportation material to alleviate the possible corrosion caused by the low pH. This
more » ... would add to the total cost of the project. It was shown here that water injection into the top layer and continuous injection of CO2 into the bottom layer of the reservoir increases the stored CO2 as well as oil production. Several Co-optimization scenarios were addressed. Increasing water injection rate and injection interval increases the total stored CO2. This perhaps is due to reduction of gas-oil mobility ratio. However, in this case the ultimate oil recovery may be reduced. The project addressed important factors for the optimization, using CMG GEM 2015 reservoir simulator. The optimum approach with intermittent water injection and continuous CO2 injection, achieved 4.46% OOIP increase in oil recovery and 8% more CO2 stored. Reduction of CO2 utilization factor (UF) from 5.22 tCO2/Sm3 oil to 4.15 tCO2/Sm3 oil demonstrated that intermittent water injection of 500 m3/day for 3 months and then injecting water at 750 m3/day for 6 months (IW500-3-750-6) provided the best economical and practical approach in this project.
doi:10.2118/170880-ms fatcat:ued7x3rrv5aqjkyprplyacz3qe