▎ 摘　　要

NOVELTY - Modified cationic emulsified asphalt, comprises 100 pts. wt. modified asphalt, 1-5 pts. wt. emulsifier, 0.2-1 pts. wt. performance regulator, 0.2-1 pts. wt. stabilizing agent and 30-100 pts. wt. water. The modified asphalt includes 100 pts. wt. matrix asphalt, 0.5-1.5 pts. wt. asphalt-based graphene oxide micro-sheet, 1-4 pts. wt. high molecular polymer and 0.5-5 pts. wt. accelerant. USE - The modified cationic emulsified asphalt is useful in drilling fluids (claimed), preferably high temperature and high pressure deep wells. ADVANTAGE - The modified cationic emulsified asphalt has a high softening point, a high solid content, and a uniform and stable dispersion. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing modified cationic emulsified asphalt, comprising (i) preparing modified asphalt, (ii) mixing and dissolving the performance regulator, stabilizing agent and water, then adding emulsifier, and adjusting the pH value, and (iii) continuously emulsifying the modified asphalt and prepared soap liquid to obtain final product.