FIELD: oil production, engines and pumps.
SUBSTANCE: invention relates to subsurface equipment of oil wells and can be used to supply deep-well oil pump motors. It aims at increasing cable life by applying layer of insulation made in propylene-ethylene thermoplastic and sublayer of another propylene-ethylene composition resistant to copper ions and making, together with aforesaid main layer, a solid structure. Note that aforesaid layers interdiffuse, when simultaneously applied via one extrusion head and, in case no additional layer is applied, via separate extrusion head.
EFFECT: longer life due to ruling out premature destruction of insulation.
2 dwg
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