A Novel Nanodrag Reducer for Low Permeability Reservoir Water Flooding: Long-Chain Alkylamines Modified Graphene Oxide

Table 3

Pressure drop and permeability ratio before and after nanodrag reducer injection.

Materials	(MPa)	(MPa)	(×10^−3 µm^2)	(×10^−3 µm^2)	Pressure drop rate; (%)	/
GO-DDA	0.2864	0.3682	5.70	4.43	−28.56	0.78
GO-TDA	0.2879	0.3017	5.66	5.40	−4.79	0.95
GO-HDA	0.2925	0.2477	5.57	6.58	15.32	1.18
GO-ODA	0.2876	0.1566	5.56	10.41	45.55	1.84