FIELD: oil producing industry; oil well machinery. SUBSTANCE: proposed stage of oil-well centrifugal multistage pump contains guide-vane assembly, open impeller installed in guide-vane assembly on lover surface of impeller driving disk blades are installed. Holes are made in impeller driving disk in spaces between blades. Lower edges of blades are provided with horizontal section, and distance from lower edge of each blade to upper surface of upper disk of guide-vane assembly formed by concave surface decreases in direction from inner edge to outer of horizontal section. Invention is aimed at decreasing wear of friction pairs owing to effectively dividing-gas bubbles and dirt inclusions and prevention of wedging of impeller in operation. EFFECT: increased efficiency and head of stage. 6 cl, 3 dwg
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