Lubricating and plugging filtrate reducer for drilling fluid and preparation method of lubricating and plugging filtrate reducer

The invention relates to the field of treating agents for drilling fluids, in particular to a lubricating and plugging filtrate reducer for a drilling fluid and a preparation method of the lubricating and plugging filtrate reducer. Comprising 31 to 35 parts of a functional monomer, 0.6 to 0.8 part of graphene oxide, 80 to 100 parts of water, 70 to 80 parts of an oil phase dispersion medium, 20 to 30 parts of paraffin, 15 to 20 parts of a composite emulsifier and 1.0 to 1.5 parts of an initiator. The functional monomers comprise acrylic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and styrene. The compound emulsifier is formed by mixing Span80 and Tween 80; the weight ratio of the Span80 to the Tween 80 is 1: 1. And the oil phase medium is white oil or diesel oil. The initiator is a composition of ammonium persulfate and sodium hydrogen sulfite. The preparation method of the lubricating plugging filtrate reducer for the drilling fluid is a reverse emulsion polymerization method. The lubricating