Polymer for oil-gas well high-temperature-resistant salt water-based fracturing fluid thickening agent

The invention discloses a polymer for an oil-gas well high-temperature-resistant salt water-based fracturing fluid thickening agent. The copolymer for the thickening agent is prepared by the following steps: mixing acrylamide (AM), acrylic acid (AA), 2-acrylamide-2-methylpropanesulfonic acid (AMPS) and acrylic acid single hyperbranched polyether alcohol ester (AHPEA) according to a ratio, dissolving the mixture in deionized water, and reacting for 3-8 hours at 50-85 DEG C under an anaerobic condition by using a redox initiator and a water-soluble azo initiator, thereby obtaining the copolymer for the thickening agent. And hydrolyzing, precipitating, freeze-drying, crushing and sieving to obtain copolymer powder for the thickening agent. The copolymer for the thickening agent has the advantages of temperature resistance, salt resistance, high dissolving speed and the like, and is suitable for a continuous fracturing process of a deep well of an oil field. 本发明公开了油气井抗高温盐水基压裂液稠化剂用聚合物。所述稠化剂用共聚物是将丙烯酰胺（AM）、丙烯酸（AA）、2