Spontaneous imbibition and core flooding analysis of pH adjusted alkali and surfactant system in high salinity sandstone reservoir

Some of the limitations a cost-effective alkaline surfactant flooding method include chemical precipitation and other formation damage issue which has greatly affected application especially in high salinity reservoirs. This study ascertains chelating attributes Ethylene-diamine-tetracetic Acid-(EDTA/NaOH), investigates ability EDTA/NaOH an anionic to improve oil recovery heavy sandstone formation. Petrophysical analysis crude core samples were performed. Hard brine at 5.1% optimal 0.2 wt.% imbibition performed on plug for over 240 hrs. volume recovered was determined using Amott cells. Sandstone test thereafter conducted -surfactant solution salinity. Spontaneous results showed that (26.6%) produced higher than hard (18.7%) after 240hrs. increased 37% OOIP with alkaline-surfactant additional 8% achieved by performing final chase flooding, totaling 45% indicating traces alkaline-surfactant, core, aided process. underpins complements several research solutions concerned harsh oilfield terrains, thus making overall process less time- consuming.