The AMPS/AA/tannin acid graft copolymer as drilling mud viscosity - reducing agent was synthesized from tannic acid, acrylic acid, and 2 - acrylamido - 2 - methylpropanesulfonic acid.

• 采用单宁酸与2-丙烯酰胺基-2-甲基丙磺酸(AMPS)和丙烯酸(AA)接枝共聚,合成了一种单宁酸接枝共聚物。