Enhanced oil recovery from denatured algal biomass: Synergy between conventional and emergent fuels

This work aims to assess the viability of converting algal biomass into production fluids for use in enhanced oil recovery. This proteinaceous biomass, which is the main waste product of algae-based biofuels and other bioproducts, may be modified and commercialized to produce conventional petroleum fuels, thereby benefiting both industries for the global energy portfolio. Tertiary oil production is generally performed on a thin profit margin to the point that for many wells it is not economically feasible to produce beyond a water flood. However, it is hypothesized here that waste proteins may be a viable option as enhanced oil recovery (EOR) agents, especially if they are available at zero-cost or negative-cost. If this technology is developed by the industry, the injection of proteins into the earth should pose little environmental risk and might offer a carbon offset for the produced petroleum. In this study, the EOR effect of algal biomass modified by a variety of denaturants has been tested in sand packs. This study also investigates correlations of this effect with the pH and rheological properties of the EOR agents. Using these novel agents, up to 96% of the original oil in place was recovered, so it can be concluded that they have great potential for application. Correlations between the EOR, the denaturant type and concentration, and the EOR effects are discussed.

Automated summary

This study assessed the viability of converting algal biomass into production fluids for enhanced oil recovery, highlighting the potential application value and environmental benefits of this technology.