Abstract:

Carbon quantum dots （CQDs） are novel zero-dimensional carbon nanomaterials, which contain many reactive functional groups （such as-OH and-COOH） on the surface. These oxygen-containing functional groups can easily chelate scaling ions, so CQDs have good scale inhibition ability. In addition, CQDs can be doped with nitrogen atoms to form coordination compounds with the outer layer of iron atom （d orbital）, so that a large amount of CQDs can adsorb on the surface of carbon steel, thus achieving good corrosion inhibition effect. Because CQDs have the characteristics of small particle size, good interface activity, good dispersion stability, easy surface functionalization, chemical stability and strong temperature-and salt-resistance, in the field of oil flooding, CQDs show greater development potential than existing conventional silicon-based nanomaterials in the face of harsh conditions such as high temperature, high salinity and ultra-low permeability,. In this review, the recent progress in synthetic methods for preparation of CQDs was summarized, and the advantages and disadvantages of these synthetic methods were discussed, as well as their effects on the composition, structure and properties of the CQDs obtained. Based on the excellent physical and chemical properties of CQDs, the application of CQDs in oil and gas field development was emphatically introduced, which could provide a reference for expanding the application of CQDs in more fields.

Key words: carbon quantum dots, preparation method, scale inhibition, corrosion inhibition, flooding