HEATING CABLE FOR EXTRACTION PIPES OF VISCOUS HYDROCARBONS OR PARAFFINIC IN CONVENTIONAL WELLS AND TYPE TIGHT WELLS, VERTICAL OR DIRECTIONAL, WITH FLOODED ANNULAR IN CASUAL OR PERMANENT FORM, SUITABLE FOR USE BETWEEN LOW AND HIGH FLUID PRESSURES RANGES

摘要

The present invention relates to a heating cable for extraction pipes of viscous hydrocarbon or paraffinic in conventional wells and tight type wells, with flooded ring in eventual or permanent cases, suitable for use between low and high fluid pressure ranges. The cable, flat type with parallel electric conductors, is also suitable for use in both vertical and directional wells with high operational flexibility in a wide range of variables. Each of the electric conductors (2) is covered by a primary insulation layer (3), and the set of conductors is monolithically coated by a main insulating layer (4) made of fluoropolymer material resistant to the high pressure of the surrounding fluid. Outside of the main insulating layer (4), the structure of the cable is complemented with an external shield (5) defined by a thin metallic material layer.