DEEP-WELL ROD-TYPE PUMP FOR WELL SIMULTANEOUS SEPARATE OPERATION Russian patent published in 2009 - IPC F04B47/00 

FIELD: engines and pumps.

SUBSTANCE: invention relates to oil simultaneous and separate extraction from two benches. Proposed pump upper cylinder communicating with pump-compressor pipe string, upper plunger with pressure valve communicating with rod string, lower cylinder, lower plunger with pressure valve and lower valve with filter. Upper and lower cylinders communicate via medium cylinder. Upper and lower plungers are coupled by a polished rod arranged in aforesaid medium cylinder to move in gland seal. Lower cylinder and medium cylinder gland seal seat communicate with pump-compressor pipe string via bypass line with valve. Bypass line inlet is arranged in medium cylinder upstream of lower plunger and downstream of gland seal. Lateral suction valve with filter is arranged on bypass line side, nearby it. Lateral suction valve inlet is arranged in medium cylinder downstream of upper plunder lower position and upstream of gland seal. Wall packer is arranged between lower suction valve and lateral suction valve outer surface.

EFFECT: higher efficiency of oil extraction.

1 dwg