BOREHOLE CENTRALIZER FOR LOWERING OF ELECTRIC SUBMERSIBLE PUMP UNIT Russian patent published in 2024 - IPC E21B17/10 

FIELD: machine building.

SUBSTANCE: invention is intended for alignment of electric motor of submersible installation of electric submersible pump (ESP). Downhole centralizer for lowering the ESP installation includes a guide tube with an upper tip installed at its ends, having a connecting thread for connection with an ESP electric motor, and a lower end part, a movable bushing, arc-shaped plate springs, and a cylindrical spring arranged between the upper tip and the movable bushing. Upper ends of arc-shaped plate springs are mounted in slots of movable bushing. Lower ends of arc-shaped plate springs are fixed in slots of lower end part made in the form of hollow housing. Guide cone with inclined inlet holes is attached to the lower end part, which is made with a radius curvature of the sharp part to prevent jamming when entering the string with a smaller diameter. Upper tip is equipped with outlet holes.

EFFECT: higher reliability of centralizer, improved alignment of electric motor of ESP unit during lowering into string and guaranteed passage of ESP installation in coupling and non-coupling casing strings and during lowering into side shaft, as well as protection of the cable extension from damage when the ESP installation enters the side shaft.

4 cl, 5 dwg