▎ 摘　　要

NOVELTY - Modifying aqueous and oil-based drilling fluids by aza-graphene nanosheets involves preparing aza-graphene nano-sheet with high nitrogen content into aqueous solution and then mixing with the existing aqueous or oil-based drilling fluid. The synthesis of the high nitrogen-content graphene material involves using inorganic salts to add high-speed ball milling of industrial sodium chloride (NaCl) or potassium chloride (KCl) crystals with carbon powder, urea, and metal-organic compounds, by controlling the mass ratio of the two ball milling materials. The ball milling time and ball milling speed can realize the ''reconstruction'' of NaCl or KCl and the molecular level of the raw material, and obtaining the carbon source precursor. The high-temperature cracking reaction is continued, and used the molten salt high-temperature reaction medium to limit the escape of molecular nitrogen atoms in the precursor, and finally realized the synthesis of graphene materials with high nitrogen content. USE - Method for modifying aqueous and oil-based drilling fluids by aza-graphene nanosheets. DETAILED DESCRIPTION - Modifying aqueous and oil-based drilling fluids by aza-graphene nanosheets involves preparing aza-graphene nano-sheet with high nitrogen content into aqueous solution and then mixing with the existing aqueous or oil-based drilling fluid. The synthesis of the high nitrogen-content graphene material involves using inorganic salts to add high-speed ball milling of industrial sodium chloride (NaCl) or potassium chloride (KCl) crystals with carbon powder, urea, and metal-organic compounds, by controlling the mass ratio of the two ball milling materials. The ball milling time and ball milling speed can realize the ''reconstruction'' of NaCl or KCl and the molecular level of the raw material, and obtaining the carbon source precursor. The high-temperature cracking reaction is continued, and used the molten salt high-temperature reaction medium to limit the escape of molecular nitrogen atoms in the precursor, and finally realized the synthesis of graphene materials with high nitrogen content. The preparation process of the aqueous solution involves adding the carbon source precursor and dispersant to a mixer and premixing with the raw materials, and pulverizing by a vibrating sieve, and sintering at a temperature of 800℃ in a nitrogen-protected rotary furnace or belt furnace, then pulverizing by a pulverizer or an air pulverizer, where the particle size of the flakes is 7-8 microns. The 500 liters of ball mill is added, where the ball mill is a zirconium ball with a diameter of 6.5 mm, and centrifuged slurry by a centrifuge, and vacuumized through the drying equipment and dried at 80℃ under nitrogen protection. The powder or aqueous slurry is packaged and shipped. The aza-graphene aqueous slurry is compounded with the drilling fluid as the addition of aza-graphene modified aqueous or oil-based drilling fluid.