FIELD: engines and pumps.
SUBSTANCE: invention relates to device for sealing system on downhole pump 1 comprising at least one feed pipeline 7 running in direction of dynamic sealing system, first valve device 8 arranged in said feed pipeline 7, and second valve device 12 arrange so that, when opened, it opens first bypass pipeline 13 running from fed pipeline point located between first valve device 8 and pump 1, and low pressure source located in pump 1 area to reduce the barrier fluid pressure in sealing system. Invention covers also the method of decreasing fluid barrier pressure for downhole pump.
EFFECT: simplified operation and pressure control system.
6 cl, 6 dwg
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