DEEP-WELL PUMP FOR OIL EXTRACTION Russian patent published in 2010 - IPC F04D13/10 F04B47/00 E21B43/38 

FIELD: engines and pumps.

SUBSTANCE: invention can be used for pumping fluids containing mechanical impurities from wells. Deep-well oil extraction pumping unit comprises pump with submerged motor with housing communicated with pump inlet in its top, and in, its bottom, with outlet of purified fluid from separator, and sump of mechanical impurities. Gravity separator of mechanical impurities consists of coaxially arranged pipes. Inner pipe is coupled with outer pipe by coupling. Outer pipe lower section is located below coupling but above inner pipe lower end face. Inner pipe lower section communicates bottom hole with pump intake via casing. Sump of mechanical impurities represents a continuation of gravity separator outer pipe and is provided with spring-loaded valve arranged at the sump bottom. Distance from bottom hole pump unit to the valve exceeds that from said unit to perforation spacing.

EFFECT: higher efficiency and reliability

1 dwg