OVERFLOW COUPLING Russian patent published in 1998 - IPC

FIELD: oil production industry. SUBSTANCE: this primarily relates to producing viscous oil, and namely to facilities for adjusting liquid level in internal string of pump-compressor pipes of double-row lifts. This is aimed at ensuring pressureless overflow of liquid from internal row of double-row lift into casing clearance. This aim is achieved by providing profiled through-passages in wall of external coupling housing which connect above-coupling space with under-coupling space in annular space of lift pipes. Upper part of internal cylindrical housing has shoulder protrusion for fixing suspension of internal row of pump-compressor pipes on external cylindrical housing. Overflow coupling is installed at top level mark of liquid in internal row of pipes. EFFECT: higher efficiency. 2 dwg