Development and Evaluation of a Novel High-temperature Resistant Coating Flocculant

Abstract In the laboratory experiment, 2-Acrylamido-2-methyl-1-propanesulfonic acid (AMPS), N, N-Dimethylacetoacetamide (DMAA), (Z)-Butenedioic anhydrides (MA) and 3-Methacryloxypropyltrimethoxysilane (KH-570) copolymers were used as reaction monomers, potassium persulfate was used as initiator, and a new type of temperature and salt resistant coating flocculant DMA-57 for water-based drilling fluid was synthesized by free radical copolymerization. The synthesis conditions were optimized by orthogonal experiment, and its performance was evaluated. The experimental results show that DMA-57 has good thermal stability, thermal decomposition temperature up to 339 °C. Under the condition of 150 °C, 3.0 MPa and 0.1% dosage, the linear expansion rate of calcium soil can be reduced by 83.83%, and the inhibition rate of calcium soil can be reduced by 67.5%, which has a good effect of flocculation inhibition.