PUMP, PUMP PLANT AND FLUID LIFTING PROCESS Russian patent published in 2015 - IPC F04B47/00 

FIELD: engines and pumps.

SUBSTANCE: proposed pump is adapted to spontaneous changeover from plunger-membrane operation to plunger operation via collapse of one resilient membrane (21a) of the pump at its fit in emergent opening (22) in tank (16a) of working assembly (15a). Plunger (6) runs in three antifriction bearings (32, 33) running in three support assemblies (26-28). Two bearings (32, 33) are isolated from contact with working fluid and fluid drive medium by cascades of seals (35) and closed chamber (39) of hydraulic protection cylinder (38) filled with lubricant for lubing the plunger (6) sidewalls. Pump comprises split joint (9) of plunger (6) with tubing (83) composed of auto coupler (1a) wherein hook (54) secured at stem (47) and catcher (55) secured at said tubing (83) are adapted for interconnection by fitting of catcher (55) on hook (54). Free weak-flow spaces of working chamber inner space (4) can be filled with 3D ballast elements (71) and flow ballast elements (75) to rule out the formation of gas-air inclusions. Pump plant (81) comprises dump (1) and drain device (85) whereof drain valve (86) is equipped with replaceable membrane (91) made of material with narrow band of breakage pressures.

EFFECT: efficient fluid lift from the well.

25 cl, 18 dwg