Cellulose nanocrystals (CNCs) with different degrees of amination to enhance tolerance to Fe (III) and enhance oil displacement performance.

Cellulose nanocrystals (CNCs) have been widely concerned in enhanced oil recovery (EOR) due to their abundant resources, small size and easy modification. In crude oil extraction, Fe (III) is increasingly produced. However, CNCs are very sensitive to Fe (III) and easy to aggregate, which brings obstacles to the application of CNCs.