DEVICE FOR HYDRAULIC PROTECTION OF AN ELECTRIC MOTOR FOR SUBMERSIBLE INSTALLATIONS FOR MAINTAINING FORMATION PRESSURE (VERSIONS) Russian patent published in 2019 - IPC F04D13/10 H02K5/12 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil production and can be used in installations for hydraulic protection of submersible electric motors for electric-centrifugal pumps used for pumping fluid into formation to maintain reservoir pressure in well. Hydraulic protection device includes a compensator, an electric motor, a protector and a submersible pump installed in series from top to bottom. Tread comprises a shaft with an axial bearing and radial bearings installed on it, as well as a head, a nipple, a compensating module with a housing, in which a nipple, an end seal and a compensating element are installed. Compensator comprises a housing, a nipple and a head. Inside the head and nipple of the protector there is a unit for protection of the end seal, which includes a pump device installed on the shaft, a labyrinth in the form of a static bushing installed with a radial gap in relation to the shaft with formation of a closed area, which does not have hydraulic connection with the compensating element.

EFFECT: inventions are aimed at improvement of device operation reliability.

9 cl, 4 dwg