Chitosan as a Biopolymer in the EOR Method: A Literature Study Baiq Maulinda Ulfah, Muhammad Taufiq Fathaddin, Rini Setiati, Dyah Rini Ratnaningsih, Abdi Suprayitno, Rohima Sera Afifah and Firdaus E3S Web Conf., 500 (2024) 03020 Published online: 11 March 2024 DOI: 10.1051/e3sconf/202450003020