SUCKER-ROD PUMP WITH ADJUSTABLE VALVES FOR EXTRACTING HIGH-VISCOSITY OIL Russian patent published in 2003 - IPC

FIELD: oil extraction industry. SUBSTANCE: sucker-rod pump has barrel, suction valve, plunger, and delivery suction-rod valve with pushrod; barrel is mounted for axial displacement inside casing. The latter is rigidly fixed to string of piping. Barrel is pressed on top by means of spring and has alignment device. Suction valve has barrel seat and shut-off member with casing passages. Sealing arrangement is installed between barrel and casing. Pump incorporates provision for reducing resistance to oil flow in suction valve and for increasing pump filling coefficient when extracting high-viscosity oil; it can be used in inclined boreholes due to forced control of both delivery and suction valves. EFFECT: enhanced efficiency and enlarged functional capabilities of pump. 1 cl, 2 dwg