CO2 INJECTION IN A CARBONATE RESERVOIR FOR EOR PROCESS
DOI:
https://doi.org/10.58916/jhas.v7i6.572الكلمات المفتاحية:
الانجليزيةالملخص
ABSTRACT: CO2 injection is a mode that is used for enhanced oil recovery (EOR). The residual oil volume is left in porous media after the secondary recovery method of waterflooding operation which can be considered a remarkable and recoverable amount that must be extracted. Therefore, the tertiary recovery mode such as CO2 injection may be a reliable method for this mission. A carbonate core holder CO2 flooding trial method has been conducted at reservoir condition to investigate the oil recovery factor. Consequently, three experiments have run in the laboratory with three CO2 slug sizes that have been injected into the carbonate reservoir after conventional secondary recovery. The results illustrated that oil flow rate increased after each injected CO2 slug. Firstly, CO2 slug size of 0.25 PV injected into reservoir which gained a recovery factor of 58.52 % with incremental recovery of 6.78 % over waterflooding process. Secondly, CO2 slug size of 0.5 PV injected after waterflooding, so, the recovery factor reached up to 61.88 % and the incremental oil recovery was 8.88 %. Finally, the result has shown a significant final oil recovery of 64.49 % and additional recovery factor of 10.75 % when the system carried out CO2 slug size injection of 1 PV. This might be attributed to good sweep efficiency, capillary force reduction, interfacial tension reduction as well as wettability alteration effectiveness. Consequently, the findings demonstrated that CO2 displacement process is a remarkable method for EOR project.
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