The invention relates to a temporary plugging agent for
drilling fluid and a preparation method of the temporary plugging agent, which belong to the technical field of chemical
drilling fluid treatment agents for oil fields. The temporary plugging agent for the
drilling fluid is prepared by crosslinking
polymerization reaction of 2-
acrylamide-2-methyl propanesulfonic acid,
acrylic acid,
acrylamide, an inorganic material, an inorganic
aluminium salt crosslinking agent, an N,N-
methylene-bis-
acrylamide organic crosslinking agent and an initiator under alkaline conditions. The inorganic material is introduced and the organic crosslinking agent and inorganic crosslinking agent are mixed for the crosslinking
polymerization reaction; raw materials of the temporary plugging agent are rich and cheap, the temporary plugging agent is easy to produce industrially, has better high-
temperature resistance (up to 150 DEG C), can effectively plug a well wall
throat, reduces filtrate invasion to a reservoir, contributes to the well wall stabilization and has the effect of adjusting a flow pattern of the drilling fluid; and in addition,
fluorescence interference does not exist, acidification and unplugging are easy, the stratum permeability can be recovered effectively, the productive capacity of a
hydrocarbon reservoir is improved, and the reservoir can be protected.