METHOD OF SIMULTANEOUS STAGE OPERATION AND PUMPING OF TWO FORMATIONS WITH ONE WELL, AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2013 - IPC E21B43/14 

FIELD: oil and gas industry.

SUBSTANCE: method involves lifting of formation fluid from upper formation by means of a submersible pump and pumping of pressure fluid from surface to lower formation to maintain formation pressure. Flow of fluid pumped from the surface to the well is used not only as energy carrier to maintain pressure in lower formation, but also as working fluid for a hydraulic downhole motor driving the submersible pump for lifting of the fluid from upper formation. Device consists of a screw-type submersible unit that comprises a screw pump driven from a hydraulic screw motor, an axial support and channels for passage of power and produced fluids. Besides, the housing of the submersible unit is provided with two packers, one of which is located above the perforation zone of upper formation, and the second one is located above perforation zone of lower formation. All the parts of rotary group of the submersible unit have a through longitudinal channel connecting the inner cavity of the tubing to perforation holes of lower formation.

EFFECT: higher effectiveness of the method and simpler device design.

5 cl, 3 dwg