▎ 摘　　要

NOVELTY - Raw material composition, comprises monomer A i.e. prop-2-enamide compound (I), monomer B i.e. prop-2-enamidomethanesulfonic acid compound (II), monomer C i.e. bis(prop-2-en-1-yl)amine chloride compound (III), monomer D i.e. sodium 4-ethenylbenzene-1-sulfonate compound (IV) and inorganic materials, where the inorganic material includes unmodified graphene oxide and modified graphene oxide, preferably graphene oxide modified by a silane coupling agent. USE - The raw material composition is useful in preparing fluid loss control agent for drilling fluid (all claimed). ADVANTAGE - The raw material composition provides a fluid loss control agent which has temperature resistance up to 220 ℃, excellent fluid loss control performance, excellent salt and calcium resistance, efficiently reduces frictional resistance, and better lubricity and plugging properties. DETAILED DESCRIPTION - Raw material composition, comprises monomer A i.e. prop-2-enamide compound of formula (I), monomer B i.e. prop-2-enamidomethanesulfonic acid compound of formula (II), monomer C i.e. bis(prop-2-en-1-yl)amine chloride compound of formula (III), monomer D i.e. sodium 4-ethenylbenzene-1-sulfonate compound of formula (IV) and inorganic materials, where the inorganic material includes unmodified graphene oxide and modified graphene oxide, preferably graphene oxide modified by a silane coupling agent. R1, R5and R6= H, 1-5C straight chain alkyl, 3-5C branched chain alkyl or 3 -5C cycloalkyl, preferably H, methyl or ethyl; R2= 1-6C alkylene group; R3and R4= H, 1-10C straight chain alkyl, 3-10C branched chain alkyl or 3-10C cycloalkyl, preferably methyl or ethyl; and R7= H, 1-3C straight chain alkyl, 3C branched chain alkyl or 3C cycloalkyl, preferably H, methyl or ethyl. INDEPENDENT CLAIMS are also included for: Fluid loss control agent, comprising the raw material composition, where the weight average molecular weight of the fluid loss control agent is 50000-350000, preferably 150000-250000; Preparaing fluid loss control agent for drilling fluid, comprising (i) polymerizing raw material system composed of the raw material composition and the fluid loss control agent solvent under the action of initiator to obtain a reactant containing the fluid loss control agent, and (ii) drying the reactant to obtain the fluid loss control agent; Use of fluid loss control agent in drilling fluid, preferably based on the total mass of the base slurry, the amount of the fluid loss control agent is 0.5-2 wt.%; and Drilling fluid, comprising 0.5-2 parts of fluid loss control agent, and 100 pts. wt. base slurry, where the base slurry includes bentonite and water in a weight ratio of 3-6:100.