Application of high-nitrogen doped graphene nanosheet in oil-based drilling fluid

The invention belongs to the technical field of oil and gas field drilling, and particularly relates to application of a high-nitrogen-impurity graphene nanosheet in oil-based drilling fluid, and the high-nitrogen-impurity graphene nanosheet is added into the oil-based drilling fluid. The preparation method of the high-nitrogen-impurity graphene nanosheet comprises the following steps: S1, premixing raw materials including inorganic salt, a carbon-containing compound and a nitrogen-containing organic compound; s2, the premixed raw materials are subjected to high-temperature pyrolysis, the high-nitrogen-impurity graphene nanosheet with the overall material surface nitrogen atom content being about 3.5-8% is obtained, and the nitrogen atom structure of the high-nitrogen-content graphene material is mainly pyridine nitrogen, pyrrole nitrogen, graphitized nitrogen and aminated nitrogen. On-site experiments show that the nitrogen atom content of the graphene and the synergistic lubrication plugging efficiency of t