▎ 摘　　要

NOVELTY - A high temperature stable emulsion wellbore cleaning agent comprises 5-50 wt.% heavy aromatic solvent S150, 1-20 wt.% surfactant, 1-10 wt.% penetrating agent, 1-10 wt.% mutual solvent, 0.05-0.5 wt.% amphiphilic flaky nanomaterial and balance water. USE - High temperature stable emulsion wellbore cleaning agent used for cleaning heavy oil wells (claimed). ADVANTAGE - The high temperature stable emulsion wellbore cleaning agent is stable for 90 days at temperature of 80℃, has strong high temperature stability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of high temperature stable emulsion wellbore cleaning agent, which involves (s1) adding mutual solvent and surfactant into water, stirring until mutual solvent and surfactant are completely dissolved, (s2) adding heavy aromatic solvent S150 under stirring, (s3) adding penetrating agent, and continuously stirring until no layering occurs, (s4) adding amphiphilic flaky nanomaterial and stirring at high speed.