FIELD: engines and pump.
SUBSTANCE: proposed pump comprises plunger with bypass valve arranged in cylinder and hollow draw element fitted for free displacement inside said plunger. Is has top and bottom thrusts and grooves made on outer surface above bottom thrusts extending beyond top thrust. Bypass valve shut-off element is spring loaded while aforesaid cylinder is made up of production string.
EFFECT: increased amplitude of hole fluid oscillation at bench level, overload protection of drive motors.
3 dwg
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