By calculating the total pressure loss of different water nozzles under different conditions of water fluxes,the authors studied the relationship between the total pressure loss and the water injecting fluxes,and obtained the relation functions.

It is shown that wellbore storage and the influence of water nozzle has been reduced.

In order to discuss the problem of layered injection in polymer flooding, we designed the surface experimental apparatus that measured the viscosity loss of polymer solutions with various flow rates when they flew through the different pore diameter water nozzles and the pores of the ingress and egress lead angle.