PUMPING PLANT FOR SIMULTANEOUS OIL PRODUCTION AND DEPRESSION-WAVE BOTTOMHOLE FORMATION ZONE TREATMENT Russian patent published in 2007 - IPC E21B43/18 

FIELD: oil production, particularly enhanced recovery methods for obtaining hydrocarbons by repressuring or vacuum methods.

SUBSTANCE: pumping plant comprises pump cylinder assembly composed of two cylinders having different diameters and connected with each other so that cylinder with greater diameter is located over that having smaller diameter. Cylinder with smaller diameter has orifices made in central part thereof and is provided with spring-loaded valve connected to settler container. Settler container has orifices in upper part thereof. Pump piston assembly comprises two pistons. Upper piston is located in cylinder with greater diameter and is connected to elongated sealed piston through hollow sub with inlet orifices. The elongated sealed piston is located in cylinder with smaller diameter. Cylinder with greater diameter is connected to flow string. Upper piston is fastened to rod stem.

EFFECT: possibility of bottomhole formation zone treatment by implosion action application along with oil production and contaminant collecting from bottomhole formation zone in specially adapted settler.

2 dwg