DEVICE FOR LIFTING VISCOUS OIL Russian patent published in 1997 - IPC

FIELD: oil production. SUBSTANCE: device for lifting viscous oil has additional string of pipes to lift oil. A pump formed by two coaxial cylinders of larger and smaller diameters, and two plungers of larger and smaller diameters is installed at the bottom of the string. The plungers are rigidly interconnected through a rod and installed in the appropriate cylinders to form air differential chamber with spring loaded discharge valve between. Pump working chamber is placed below the plunger of smaller diameter. The plunger of larger diameter is related to rods. EFFECT: higher capacity. 1 dwg