**4. Conclusion**

The SLS surfactant synthesized from bagasse with its natural characteristic can be used as an injection fluid in surfactant injection to increase oil recovery for sandstone with low to high salinity reservoir. The SLS surfactant synthesized from bagasse has displaced some of the residual oil after waterflood, depending on the IFT reduction, middle-phase emulsion (microemulsion), and adsorption value. The results of this study showed that the synthesized SLS surfactant of bagasse with its natural characteristics can be used as injection fluid in surfactant injection to increase oil recovery, especially for the light oil recovery. So the use of sodium lignosulfonate surfactant synthesized from bagasse is a challenge to be developed further as a surfactant flooding.

### **Acknowledgements**

Thanks to the OGRINDO Consortium Research at the Bandung Institute of Technology (ITB), Trisakti University, and the Indonesian Directorate General of Higher Education Decentralization Fund for PUPT Fund 2015–2018 ITB for facilitating this research. We also thank IntechOpen who published this article, which in turn will benefit the society.

*Surfactant Flooding for EOR Using Sodium Lignosulfonate Synthesized from Bagasse DOI: http://dx.doi.org/10.5772/intechopen.88689*
