Rahul Saha is an assistant professor in the school of petroleum technology, Pandit Deendayal Petroleum University, Gandhinagar, Gujarat, India. His research area is primarily focused on the recovery of crude oil from reservoirs by chemical enhanced oil recovery method and the application of nanotechnology. His teaching areas is focused on Chemical and Petroleum engineering and so far, he has published 7 research articles. Pankaj Tiwari is working as an assistant professor in the Department of Chemical Engineering at Indian Institute of Technology Guwahati. His research activities are in studying the various mechanisms for enhanced oil recovery and, developing kinetics and compositional models for pyrolysis and combustion processes. He has previously worked at General Electric, Plastic division at JFWTC Bangalore on developing the monomer for high-performance polymer (HPP).Ramgopal V.S. Uppaluri is currently working as a professor, department of chemical engineering, Indian Institute of Technology Guwahati. His research interests include membrane technology, petroleum engineering and refining, food engineering and processing, process optimization and wastewater treatment. He has published more than 90 research papers in journals of national and international repute. In upstream engineering, his research is primarily in the field of chemical and polymer enhanced oil recovery.

• 1. Introduction. 2. Alkali Flooding: Acid Number and Mechanism. 3. Alkali and Surfactant Flooding. 4. Surfactant Adsorption Characteristics on Reservoir Rock. 5. Nanofluid (Polymer/Surfactant-polymer) Flooding. 6. Problems and Challenges in Chemical EOR. 7. Application of Nanofluid for Unconventional Reservoirs.

Rahul Saha is an assistant professor in the school of petroleum technology, Pandit Deendayal Petroleum University, Gandhinagar, Gujarat, India. His research area is primarily focused on the recovery of crude oil from reservoirs by chemical enhanced oil recovery method and the application of nanotechnology. His teaching areas is focused on Chemical and Petroleum engineering and so far, he has published 7 research articles. Pankaj Tiwari is working as an assistant professor in the Department of Chemical Engineering at Indian Institute of Technology Guwahati. His research activities are in studying the various mechanisms for enhanced oil recovery and, developing kinetics and compositional models for pyrolysis and combustion processes. He has previously worked at General Electric, Plastic division at JFWTC Bangalore on developing the monomer for high-performance polymer (HPP).Ramgopal V.S. Uppaluri is currently working as a professor, department of chemical engineering, Indian Institute of Technology Guwahati. His research interests include membrane technology, petroleum engineering and refining, food engineering and processing, process optimization and wastewater treatment. He has published more than 90 research papers in journals of national and international repute. In upstream engineering, his research is primarily in the field of chemical and polymer enhanced oil recovery.

• 1. Introduction. 2. Alkali Flooding: Acid Number and Mechanism. 3. Alkali and Surfactant Flooding. 4. Surfactant Adsorption Characteristics on Reservoir Rock. 5. Nanofluid (Polymer/Surfactant-polymer) Flooding. 6. Problems and Challenges in Chemical EOR. 7. Application of Nanofluid for Unconventional Reservoirs.

Rahul Saha is an assistant professor in the school of petroleum technology, Pandit Deendayal Petroleum University, Gandhinagar, Gujarat, India. His research area is primarily focused on the recovery of crude oil from reservoirs by chemical enhanced oil recovery method and the application of nanotechnology. His teaching areas is focused on Chemical and Petroleum engineering and so far, he has published 7 research articles. Pankaj Tiwari is working as an assistant professor in the Department of Chemical Engineering at Indian Institute of Technology Guwahati. His research activities are in studying the various mechanisms for enhanced oil recovery and, developing kinetics and compositional models for pyrolysis and combustion processes. He has previously worked at General Electric, Plastic division at JFWTC Bangalore on developing the monomer for high-performance polymer (HPP).Ramgopal V.S. Uppaluri is currently working as a professor, department of chemical engineering, Indian Institute of Technology Guwahati. His research interests include membrane technology, petroleum engineering and refining, food engineering and processing, process optimization and wastewater treatment. He has published more than 90 research papers in journals of national and international repute. In upstream engineering, his research is primarily in the field of chemical and polymer enhanced oil recovery.

• 1. Introduction. 2. Alkali Flooding: Acid Number and Mechanism. 3. Alkali and Surfactant Flooding. 4. Surfactant Adsorption Characteristics on Reservoir Rock. 5. Nanofluid (Polymer/Surfactant-polymer) Flooding. 6. Problems and Challenges in Chemical EOR. 7. Application of Nanofluid for Unconventional Reservoirs.