Low-viscosity copolymer filtrate loss reducer for drilling fluid and preparation method of low-viscosity copolymer filtrate loss reducer

The invention discloses a low-viscosity copolymer filtrate loss reducer for a drilling fluid and a preparation method of the low-viscosity copolymer filtrate loss reducer. The low-viscosity copolymerfiltrate loss reducer is prepared from a polymeric monomer and 0.5 to 2 parts of nanomaterial, wherein the polymeric monomer is prepared from the following components in parts by weight: 1 to 4 partsof 2-acrylamide-2-methyl propane sulfonic acid, 6 to 12 parts of acrylamide, 1 to 3 parts of sodium p-styrene sulfonate and 0.5 to 2 parts of itaconic acid. Compared with the prior art, the low-viscosity copolymer filtrate loss reducer for the drilling fluid and the preparation method of the low-viscosity copolymer filtrate loss reducer, disclosed by the invention, have the advantages of low viscosity, salt resistance, calcium and magnesium resistance, high temperature resistance and little influence on rheological property; in addition, the low-viscosity copolymer filtrate loss reducer has agood water loss reduction e