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

FIELD: oil and gas industry.

SUBSTANCE: well sucker-rod pump contains cylinder, suction and pressure valves, hollow plunger with tube at lower end, rotary actuator of flow of liquid made in form of worm with sleeve, coupling tube cavity with exterior surface of plunger. The pump is equipped with a hollow double-step spring loaded piston with a large end surface underneath. The piston is installed in the plunger cavity at the upper end of it. The cavity is closed with a stepped adaptor. A radial channel is cut on the upper part of the plunger, coupling the cavity of the plunger with an under piston cavity. Also a lengthwise channel is cut in the plunger, which couples a medium and above-the piston cavities with the sleeve cavity. An additional channel of a big diameter is bored on the upper part of the lengthwise channel. A ball is installed on the created conic surface; the diameter of the ball is bigger, than the diameter of the main channel, but less, than diameter of the additional channel.

EFFECT: increased service life of pump.

3 dwg