▎ 摘　　要

NOVELTY - Lubricating plugging fluid loss agent for drilling fluid,comprises functional monomer, 0.6-0.8 pts.wt.graphene oxide, 80-100pts.wt.water, 70-80pts.wt. oil phase dispersion medium, 20-30 pts.wt. paraffin, 15-20 pts.wt.composite emulsifier and 1.0-1.5 pts.wt.initiator. USE - Lubricating plugging fluid loss agent for the drilling fluid. ADVANTAGE - The composition has wider particle size distribution range, effectively plugs microcracks with different sizes, forms a high-lubricity isolating membrane, has lubricating property, plugging property and filtrate loss reduction property, resists temperature up to 220 ℃ and NaCl to saturation, and has wide application prospect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation method of the lubricating plugging fluid loss additive for the drilling fluid, involves adding 70-80 pts.wt. oil phase dispersion medium and 20-30 pts.wt. Paraffin into reaction kettle, slowly adding 15-20pts.wt. composite emulsifier under stirring condition of 80-100 r/min, and stirring for 40-60 min to obtain oil phase for later use, adding 80-100 pts.wt.water into another reaction kettle, starting stirring at rotating speed of 80-100 r/min for 30-40 min, then slowly adding 8-9 pts.wt.acrylic acid, 9-10pts.wt. acrylamide, 8-9 pts.wt.2-acrylamido-2-methylpropanesulfonic acid, 6-7pts.wt. styrene and 0.6-0.8 pts.wt.graphene oxide in sequence, adjusting pH value to 7-8, and stirring for 40-60 min to obtain water phase for later use;slowly adding water phase into oil phase, starting stirrer, regulating rotating speed to 120-150 r/min, stirring for 30-40 min, introducing nitrogen to remove oxygen for 30-50 min, adding 1.0-1.5 parts of an initiator, heating to 60-70 ℃, and polymerizing for 3-4 h to obtain final product.