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

Abstract

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.

1 - 9 . (canceled) 
     
     
         10 . A heating cable for extraction pipes of viscous hydrocarbon or paraffinic comprising:
 a cable;   a set of electric conductors located inside the cable;   a first insulating layer surrounding each one of the electric conductors;   a monolithically layer made of fluoropolymer material surrounding the set of electric conductors; and   a metallic shield surrounding the cable.   
     
     
         11 . The heating cable according to  claim 10 , wherein the cable is flat. 
     
     
         12 . The heating cable according to  claim 10 , wherein the electric conductors are multifilament electric conductors. 
     
     
         13 . The heating cable according to  claim 10 , wherein the set of electric conductors includes three electrical conductors. 
     
     
         14 . The heating cable according to  claim 10 , wherein the metallic shield is a thin layer, the metallic shield is wrapped on the cable in a spiral form.