Preparation method of high-strength epoxy resin pressure-bearing plugging material and oil-based drilling fluid

The invention discloses a preparation method of a high-strength epoxy resin pressure-bearing plugging material and an oil-based drilling fluid, the structure of the pressure-bearing plugging material is branched, and the pressure-bearing plugging material is characterized by comprising the following raw materials: diphenyl glycol, polyhydroxy substituted phenyl glycol, hexagonal boron nitride and a silane coupling agent, the molar ratio of the polyhalogenated polybenzene rings to the diaminoglycols is (1-2): 1. According to the synthesized branched epoxy resin polymer, modified hexagonal boron nitride with hydroxyl and carboxyl on the surface is combined through a silane coupling agent, the pressure bearing capacity of the final product branched epoxy resin pressure-bearing plugging material can reach 150-180 MPa, the compressive strength is 2-3 times that of a traditional epoxy resin plugging material, and when the branched epoxy resin pressure-bearing plugging material is applied to oil-based drilling fluid