SUCKER-ROD PUMPING UNIT Russian patent published in 2005 - IPC

FIELD: oil producing industry; viscous oil production.

SUBSTANCE: proposed unit contains strings of tubings and rods, different diameter lower and upper cylinders, two hollow plungers of smaller upper and large lower diameters, suction and delivery valves. Upper end of small plunger is connected with rod-adapter with holes. Lower and upper plungers are connected by hollow rod which is connected by adapter with lower end of upper plunger and is coupled with plunger rod by sleeve-adapter with holes in space of which ball valve is installed higher than holes. Lower part of plunger rod passes through space of lower plunger, and its end is provided with cone-like thickening and plays the part of suction and delivery valve together with lower end of large diameter plunger. Tubing casing is connected with top of upper cylinder by lock support, and with top of lower cylinder, by sleeve. Filter with side holes is fastened on lower end of lower cylinder by sleeve. Plate with holes is installed on hollow rod between solid sleeve and lower plunger. Plates-limiters of plunger rod deflection with holes are installed in upper space of lower plunger and in middle. Head is installed on lower end of outer surface of lower plunger. Preference is made for making lower plunger of sucker-rod pumping unit from of elastic material.

EFFECT: prevention of sticking of sucker-rod string at downwards movement.

2 cl, 1 dwg