▎ 摘　　要

NOVELTY - Nano-fluid for improving low permeability reservoir petroleum recovery rate prepared by (i) placing the beaker with citric acid in an oven at 180-220degreesC and heating for 0.5-2 hours, (ii) cooling the product to room temperature, dissolving in deionized water to obtain solution, (iii) placing the solution into the dialysis bag for dialysis, (iv) drying the solution in the dialysis bag in a 60-80degreesC oven to obtain graphene oxide with a relatively uniform size, (v) dispersing graphene oxide in tetrahydrofuran, filtering the solution, adding alkyl primary amine and catalyst into tetrahydrofuran under nitrogen atmosphere successively, (vi) adding dehydrating agent and stirring for 0.5-1 hour, and (vii) heating and filtering the uniformly stirred mixture at 40-60degreesC to obtain amphiphilic graphene oxide nanofluid, is claimed. USE - Used as nano-fluid for improving low permeability reservoir petroleum recovery rate. ADVANTAGE - The nano-fluid: has simple preparation method; utilizes economical raw materials; has low requirements for the synthesis environment; is easy to be formulated on site and promoted on a large scale; and improves oil recovery in low permeability reservoirs.