DOWNHOLE HYDRAULICALLY DRIVEN PUMP ASSEMBLY Russian patent published in 2012 - IPC F04B23/00 F04B47/04 

FIELD: engines and pumps.

SUBSTANCE: proposed assembly comprises strong of downhole diaphragm pumps (26, 27, 28, 29) and pump unit downed into well on tubing string (TS). Working chambers of said pumps are connected to common lines feeding pulsating working fluid flow to ensure section and delivery conditions in working chamber. Working chamber 35 communicates via valves 34 with well hole clearance and TS pipeline 1. Pump unit consists of working fluid tank 23, hydro automatic unit, hydraulic power unit and auxiliary unit. The latter comprises hydraulic pump 25 and compressor 24. Hydraulic pump feeds working fluid from tank 23 into hydraulic line of hydro automatic unit. Compressor feeds compressed air into hydro automatic unit pneumatic line. Hydraulic power unit comprises hydraulic accumulator 21 communicated with tank 23. Said hydraulic accumulator 21 communicates in its turn via electronic-control electromagnetic valves with lines of downhole pumps.

EFFECT: higher efficiency and reliability, simplified design and adjustments.

2 dwg