Abstract
The residual oil after primary or secondary oil recovery can be recovered by the methods of EOR (Enhanced Oil Recovery). The objective of this study is screening the surfactants that generate maximum stable foam in the presence of brine salinity at 92oC. Laboratory experiments have been performed to examine and compare the stability of generated foam by individual and blended surfactants in the synthetic brine water. AOS C14-16 (Alpha Olefin Sulfonate) and SDS (Sodium Dodecyl Sulfonate) were selected as main surfactants. Aqueous stability test of AOS C14-16 and SDS with brine water salinity 62070ppm was performed at 92oC. AAS (Alcohol Alkoxy Sulfate) was blended with SDS and AOS C14-16. The solution was stable in the presence of brine salinity at same conditions. Salt tolerance experimental study revealed that AOS C14-16 did not produce precipitates at 92oC. Further, the foam stability of surfactant blend was performed. Result shows that, the maximum life time of generated foam was observed by using blend of 0.2wt% SDS+0.2wt% AOS+0.2wt% AS-1246 and 0.2wt% AOS+0.2wt% IOSC15-18+0.2wt% AAS surfactants as compared to the foam generated by individual surfactants. The success of generated foam by these surfactant solutions in the presence of brine water is the primary screening of surfactant stability and foamability for EOR applications in reservoirs type of reservoirs.
Highlights
During gas injection, viscous fingering and gravity override problems are introduced
The injection of foam either by using any EOR method such as FAWAG (Foam Assisted Water Alternating Gas), SAG (Surfactant Alternating Gas), or foam flooding has gained increasing attention by oil industry due to potential advantages over other methods used in EOR [1,2,3,4]
Equal concentration of surfactant SDS was blended with additive AAS to maximize the range of brine salinity and strong foam generation
Summary
Viscous fingering and gravity override problems are introduced. Usage of surfactant (stable foam generated by single or blended surfactant solutions) minimizes the problems of early gas breakthrough, gravity override and viscous fingering during the water alternating gas injection process. This research is helpful for selecting the surfactant through screening of individual and blended surfactant solutions in the presence of brine water that generates maximum foam. This generated stable foam will help in the gas mobility control during the water alternating gas injection as EOR processes. This research deals with single and blended surfactants in the presence of different brine salinity to generate the maximum foam. Objective of this research study, anionic surfactants (AOSC14-16, AS-1246, SDS, IOSC15-16) and one
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