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In the surfactant alternating gas injection, the injected surfactant slug is remained several days under reservoir
temperature and salinity conditions. As reservoir temperature is always greater than surface temperature.
Therefore, thermal stability of selected surfactants use in the oil industry is almost important for achieving
their long-term efficiency. The study deals with the screening of individual and blended surfactants for the
applications of enhanced oil recovery that control the gas mobility during the surfactant alternating gas
injection. The objective is to check the surfactant compatibility in the presence of formation water under
reservoir temperature of 90oC and 120oC. The effects of temperature and salinity on used surfactant solutions
were investigated. Anionic surfactant Alpha Olefin Sulfonate (AOSC14-16) and Internal Olefin Sulfonate
(IOSC15-18) were selected as primary surfactants. Thermal stability test of AOSC14-16 with different formation
water salinity was tested at 90oC and 120oC. Experimental result shows that, no precipitation was observed by
surfactant AOSC14-16 when tested with different salinity at 90oC and 120oC. Addition of amphoteric surfactant
Lauramidopropylamide Oxide (LMDO) with AOSC14-16 improves the stability in the high percentage of salinity
at same temperature, whereas, the surfactant blend of IOSC15-18 and Alcohol Aloxy Sulphate (AAS) was resulted
unstable. The solubility and chemical stability at high temperature and high salinity condition is improved by
the blend of AOSC14-16+LMDO surfactant solution. This blend of surfactant solution will help for generating
stable foam for gas mobility control in the methods of chemical Enhanced Oil Recovery (EOR).
Muhammad Khan Memon, Ubedullah Ansari, Habib U Zaman Memon. (2020) Thermal Stability and Compatibility of Surfactants in Presence of Formation Water Salinity under Reservoir Conditions , Mehran University Research Journal of Engineering & Technology, Volume 39, Issue 4.
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