FIELD: oil and gas industry.
SUBSTANCE: operational reliability of the submersible device in an output well is provided by the operational reliability of tread rings. The submersible device casing comprises circular grooves on an outer surface wherein rings of a treat alloy are arranged. The circular grooves have an inclination of the side surfaces of the groove to its base no more than 90°. The tread rings have a return profile of the contact surface. The outer surface of the tread rings does not project beyond the outer surface of the casing. The surface of the circular grooves is wavy. The rings are made of a tread alloy of magnesium, aluminium, zinc, and indium.
EFFECT: higher operational reliability of the submersible device.
3 cl, 3 dwg
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