OIL-WELL PUMP Russian patent published in 2009 - IPC F04B47/00 

FIELD: motors and pumps.

SUBSTANCE: pump consists of an operating couple of equipment such as plunger and cylinder with traveling valve and standing valve being installed in them, and entrained solids filter. The filter is coupled with pump suction, and underneath it is provided with a tank to preliminary accumulate entrained solids. The entrained solids filter consists of concentrically arranged pipes. The upper part of the external pipe and lower part of the internal pipe provide hydraulic connection of well bottom with pump suction. The tank intended for preliminary accumulating entrained solids is implemented as a continuation of the external filter pipe and provided with a spring-loaded valve installed in the lower part of the tank. The distance from the pump to the spring-loaded valve is longer than the distance from the pump to the perforation interval. By virtue of this invention, the efficiency of pump operation is increased due to pumped liquid cleaning from entrained solids accumulated in well bottom and their removal by rinsing during wellbore intervention.

EFFECT: increased time between overhauls due to entrained solids separation during pump operation and reduced deterioration of operating couple such as plunger-cylinder and pump valve units.

1 dwg