FIELD: oil producing industry; hydraulic machine building.
SUBSTANCE: invention can be used in deep marginal wells. Proposed pump has stage including screw unit arranged between adjacent centrifugal impellers. Screw unit can be made split and include thrust cone-bushing with two mating surfaces, screw with two mating surfaces, and impeller. One of mating surfaces is mechanically mated with part of mating surface on frontal side pf centrifugal impeller of stage following in direction of liquid flow. Other mating surface of screw is mechanically mated with first mating surface of thus cone-bushing. Opposite (second) mating surface of thrust cone-bushing is mechanically mated with part of mating surface of rear side of centrifugal impeller.
EFFECT: provision of increase of head of formation fluid passing successively from one stage of pump to following stage.
1 dwg
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