BOREHOLE FLUID PUMPING SYSTEM (VARIANTS) AND PROCESS OF BOREHOLE FLUID PUMPING Russian patent published in 2008 - IPC E21B43/00 F04B47/00 

FIELD: mining.

SUBSTANCE: well shaft can be bored through one or more formations containing sought fluids, e.g. hydrocarbon-based fluids. The device can be implemented in several variants. One of the variants includes placement system and well killing equipment. It is placed in the well shaft and comprises pump unit in the form of a pump with outlet for fluid and two chambers. Each chamber has an expanded element inside, and hydraulic control system implements reciprocating transportation of working fluid from one expanded element to another. At that, resulting consequent compression and expansion of expanded elements enables suction of borehole fluid into one chamber while borehole fluid is discharged from another chamber. Control valve enables reciprocating transportation of working fluid and can be actuated by differential pressure of working fluid in compensated drainage chamber and outside of it. The process describes the sequence of maintenance operations for the device.

EFFECT: improved reliability of extraction or delivery of fluids.

20 cl, 35 dwg