▎ 摘　　要

NOVELTY - Aqueous-based drilling fluid comprises 1000 pts. wt. water, 30-35 pts. wt. sodium-based bentonite, 1-2 pts. wt. composite metal ion polymer MMCA, 5-10 pts. wt. hydrolyzing polyacrylonitrile ammonium salt, 3-6 pts. wt. polyamine, 20-50 pts. wt. white asphalt, 20-50 pts. wt. superfine calcium carbonate, 4-8 pts. wt. high temperature resistant fluid loss agent SRD220, 1-5 pts. wt. high temperature resistant reservoir blocking agent and 330-340 pts. wt. barite. USE - The fluid is useful for shale high temperature reservoir. ADVANTAGE - The fluid can overcome the reduction problem of graphene oxide when blocking the high temperature formation; and blocks the micro-nano development shale the pore. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing drilling fluid comprising (i) mixing water with sodium bentonite, stirring for 30-60 minutes at a stirring speed of 1000-4000 revolutions/minute, stirring for 30-40 minutes at a stirring speed of 6000-10000 revolutions/minute, and placing it at room temperature and curing for 24 hours to form mixture I; (ii) adding composite metal ion polymer MMCA and hydrolyzed polyacrylonitrile ammonium salt to the mixture I under the stirring speed of 6000-10000 revolutions/minute, adding polyamine and ammonium salt after stirring evenly, adding white asphalt, stirring uniformly, then adding ultrafine calcium carbonate, and adding high temperature resistant fluid loss reducer SRD220 to form mixture II; (iii) adjusting the pH value of mixture II to 8.5-9.5 with sodium hydroxide to form mixture III; (iv) adding barite to the mixture III and stirring uniformly to obtain the base slurry of polyamine water-based drilling fluid; and (iv) adding high temperature resistant reservoir plugging agent to the polyamine water-based drilling fluid base slurry and stirring uniformly.