FIELD: oil and gas industry.
SUBSTANCE: device comprises a drive, a pump, and a shaft connecting the drive to the pump, and a mechanical sealing unit. This unit comprises, in turn, a mechanical seal with a rotatable sealing ring and a stationary sealing ring. The mechanical seal has the ability to seal the shaft. There is an autonomous feeding device which provides for a mechanical barrier medium sealing. The independent feeding device, drive, pump, shaft and the mechanical sealing unit form a compact transport unit that is completely submerged in the borehole. The independent feeding device comprises a first chamber for barrier medium receiving and the second chamber. This device is connected to the well transport device outer side so that the pressure corresponding to the transported medium pressure prevails in the second chamber. The bellows sealingly separates the first chamber from the second chamber.
EFFECT: increased device reliability.
10 cl, 3 dwg
