| 摘要 |
A heater cable for hydrocarbon drilling tubing, preferably applicable to pressurized or flooded annular space shale type wells, to prevent and/or remove obstructions in petroleum production wells tubing, caused by the accumulation of substances such as paraffin and hydrates or by a sharp increase in viscosity of the type which extends alongside a metallic thermo conductor duct affixed to the tubing by means of fixation elements. The cable is formed by an inner sheath insulating the electrical conductors, a metallic coat on said conductors' insulating sheath, a fluoropolymeric jacket surrounding said metallic sheath and an outer armour generally defined by a spring which surrounds the jacket in a helicoidal way. The coating of the conductors' insulating sheath is defined by a laminar band which protects all the surface of said sheath arranged in a surrounding way alongside it following a helicoidal arrangement and whose successive spirals are partially overlapped between them. According to a preferred embodiment, said laminar band is formed by an outer aluminium sheath and an inner polymeric sheath. |
