The invention belongs to the field of oil exploitation, and discloses a
polymer drag
reducer premixer, which comprises a premixer main body and a self-adjusting
assembly, the premixer main body comprises a liquid inlet cavity, a
powder inlet cavity and a mixing cavity, the liquid inlet cavity and the
powder inlet cavity are both communicated with the mixing cavity, the liquid inlet cavity and the
powder inlet cavity are both arranged at the upper end of the premixer main body, and the self-adjusting
assembly is arranged at the lower end of the premixer main body. The liquid inlet cavity is annularly arranged on the outer wall of the powder inlet cavity, the mixing cavity is arranged at the bottoms of the powder inlet cavity and the liquid inlet cavity, the self-adjusting
assembly comprises a liquid stopping component and a powder stopping component, the liquid stopping component and the powder stopping component rotate in a meshed mode, the liquid stopping component is arranged in the liquid inlet cavity, and the powder stopping component is arranged in the powder inlet cavity. The self-adjusting assembly comprises a liquid stopping component and a powder stopping component, the functions of pre-
wetting and conveying powder through
water flow are reserved, and meanwhile the problem that a powder conveying
system breaks down due to the fact that fluid flows upwards due to unsmooth accidental conveying is effectively solved.