FIELD: engines and pumps.
SUBSTANCE: proposed plant comprises motor connected via downhole cable line to surface control station with frequency converter, radial-flow pump a with inlet 1 and at least one pump section c. Said section features lower delivery compared with that of pump a at zero head and is arranged in series with radial-flow pump a. Additional section inlet 2 and outlet 3 are communicated with hydraulic channel accommodating at least one check valve b with operating pressure threshold not exceeding preset adjustment accuracy.
EFFECT: higher efficiency in wells with major variations of local water inflows.
2 cl, 5 dwg
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