Polymer shear strength improving agent, well slurry Qi stagnation plug and preparation method of well slurry Qi stagnation plug

The invention provides a polymer shear strength improving agent and a well slurry qi stagnation plug containing the same, the polymer shear strength improving agent is a terpolymer of 2-acrylamide-2-methylpropanesulfonic acid, a first monomer and a second monomer, the first monomer is acrylamide, and the second monomer is an organic quaternary ammonium salt containing C = C or N-alkenyl substituted pyrrolidone. The qi stagnation plug is easy to prepare, the defects that an existing qi stagnation plug system is long in preparation time, high in preparation space requirement and the like can be overcome, the construction efficiency is improved, the temperature resistance of the well slurry qi stagnation plug reaches 180 DEG C, the well slurry qi stagnation plug can circularly enter a well, and the performance of well slurry is not affected. 本发明提供一种聚合物提切剂和包含其的井浆气滞塞，所述聚合物提切剂为2-丙烯酰胺-2-甲基丙磺酸、第一单体和第二单体的三元共聚物，其中所述第一单体为丙烯酰胺，所述第二单体为含C＝C的有机季铵盐或N-烯基取代吡咯烷酮。所述气滞塞配制简单，可以弥补目前气滞塞体系配制时间长、配制空间要求高等缺点，提高施工效率，且该井浆气滞塞抗温达180℃，可循环入井，