Hybrid Carbonated Engineered Water as EOR Solution for Oil-Wet Carbonate Formation

Bisweswar Ghosh (), Alibi Kilybay, Nithin Chacko Thomas, Mohammed Haroun, Md Motiur Rahman and Hadi Belhaj
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Bisweswar Ghosh: Department of Petroleum Engineering, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates
Alibi Kilybay: Department of Petroleum Engineering, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates
Nithin Chacko Thomas: Department of Petroleum Engineering, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates
Mohammed Haroun: Department of Petroleum Engineering, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates
Md Motiur Rahman: Department of Petroleum Engineering, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates
Hadi Belhaj: Department of Petroleum Engineering, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates

Energies, 2022, vol. 15, issue 21, 1-21

Abstract: Carbonated water has proven advantages over conventional CO 2 injection in terms of arresting free CO 2 mobility, low-pressure injection, lower volume requirement, and higher efficiency. The term “engineered water” is designated to selective ion-spiked injection water with the advantage of the ion-exchange reactions with the rock minerals and releasing trapped oil. This article investigated the synergic effect of dissolved CO 2 and engineered water for oil recovery and understanding inner mechanisms. Recovery efficiencies were evaluated through coreflood studies, which revealed that the hybrid water could recover 6–10% more oil than engineered water and about 3% more than carbonated water. HP-HT pendant-drop studies show the insignificance of IFT reduction. Wettability change from oil wet to near-water wet is attributed as a significant factor. The dissolution of Ca 2+ and Mg 2+ and deposition of SO 4 2− observed in coreflooding may have a significant contribution to oil recovery. Pore enlargement evidenced in NMR-PSD and NMR-ICP results support this claim. The study confirmed that the EWI-CWI hybrid technique could be a promising EOR method, eliminating the requirement for high-pressure injection, the problems of gravity segregation, and the early breakthrough of CO 2 . It can also be an effective EOR solution, providing a significant cost advantage and higher oil recovery in addition to the environmental benefits of CO 2 sequestration.

Keywords: carbonated water injection; engineered water injection; hybrid EOR; smart water flood; CWI; SWI (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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