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EOR by smart water flooding in low temperature sandstone reservoirs

Kalampalikis Ioannis

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Summary

New oil discoveries have dropped dramatically the last decade. For that rea-son, oil in place from already discovered reservoirs has become one of themost important targets for the oil companies. ”Smart Water” flooding is achemical EOR method that improves oil recovery by wettability alteration,resulting in improved microscopic sweep efficiency by the increasing capillaryforces. The parameter that influence the wettability alteration process andconsequently the EOR potential is the initial reservoir wetting state. Initialwetting state is affected by the mineralogy, crude oil, formation water compo-sition and the temperature-pressure conditions of the reservoir. According tothe published literature, the optimum conditions to observe the EOR effectsby ”Smart Water” flooding appear to be mixed-wet wettability conditions.The objective of this thesis was to evaluate the potential EOR effect byLow Salinity ”Smart Water” injection in a sandstone reservoir with initialunfavorable conditions. The experimental basis to evaluate the EOR poten-tial with ”Smart Water” were screening techniques and the oil recovery teststo validate the observations. This thesis contains literature review, experi-mental part, results with discussion and finally the conclusions.Based on the obtained results, even if the sandstone core material doesnot meet the favorable requirements for the highest EOR potential, an impor-tant increase in secondary mode with ”Smart Water” injection was observed.Finally, a smaller scale increase was observed with ”Smart Water” injectionduring tertiary mode.

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