Comparative analysis of the EOR mechanisms by using low salinity and low hardness alkaline water

This paper discusses the application of low hardness alkali water compositions (LHAW) as a secondary and tertiary displacement agent for EOR. A comparative analysis of the impact of low salinity water (LSW) and LHAW water on interfacial tension, contact angle on rock, adsorption of ions, emulsion st...

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Bibliographic Details
Published in:	Journal of petroleum science & engineering Vol. 162; pp. 35 - 43
Main Authors:	Suleimanov, Baghir A., Latifov, Yashar A., Veliyev, Elchin F., Frampton, Harry
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 01-03-2018
Subjects:	Bentonite swelling Emulsion EOR Low hardness alkali water Low salinity water Sandstone flooding Low hardness alkali water EOR Emulsion Low salinity water Sandstone flooding Bentonite swelling
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Summary:	This paper discusses the application of low hardness alkali water compositions (LHAW) as a secondary and tertiary displacement agent for EOR. A comparative analysis of the impact of low salinity water (LSW) and LHAW water on interfacial tension, contact angle on rock, adsorption of ions, emulsion stability and clay swelling is presented. LHAW application contributes to the formation of stable water in oil (w/o) emulsions and a decrease in clay swelling compared to LSW. Adsorption values for both fluids are similar. Contact angle measurements show that both LSW and LHAW reduce interfacial tension compared to Synthetic Caspian Sea water (SCSW), by up to 17% and 94% respectively. Similar results were observed for contact angle measurements. Flooding experiments were conducted in secondary and tertiary modes. In secondary flooding the two water compositions LHAW-2 and LHAW-1 increased the oil recovery (%OOIP) in comparison with SCSW at water breakthrough, by 29% and 25% respectively. The final oil recovery increases were 21% and 15% respectively. In tertiary flooding, tests showed that LHAW-2 and LHAW-1 oil recoveries (%OOIP) compared to LSW were 13% and 10% respectively. The oil recovery rate for LHAW solutions was not linear versus lnt as was that for LSW. This was proposed as a consequence of emulsions generation while water-cut is below 50% however, above 50% water cut the rate stabilizes. [Display omitted] •The application of low hardness alkali water compositions (LHAW) for EOR.•A comparative analysis of the impact of LSW and LHAW on oil recovery.•Interfacial tension, contact angle, adsorption and emulsion studies were presented.•Clay swelling rate increases with decreasing salt content in the water composition.
ISSN:	0920-4105 1873-4715
DOI:	10.1016/j.petrol.2017.12.005