FIELD: oil and gas industry.
SUBSTANCE: to the well, to the area of deposits formation, heating system is submerged; the above system comprises a linear heating element made as outer load-bearing steel armour of a logging cable and feeding core, which are circuited in the cable head part by means of a locking element (locker). The locker is a local heater. During running down of the heating system to the well local heating in the head part is performed mainly; to this end high-frequency current is passed through the feeding core, locking element and linear heating element. Current frequency is set at the lowest threshold so that depth of electric field penetration into metal of linear heating element is less than its thickness. At that heat will be generated in the head part mainly. Due to that sections clogged with deposits (plugs) are passed through by running the heating system down the well, at that temperature of the locker and its environment is controlled by temperature sensor and maintained by heating control system within the required range. Upon complete submersion of the heating system to the well mainly by-product heating is performed. For this purpose heating control system redistributes power between linear heating element and locker, which is attained by saturation of the locker ferromagnetic core and simultaneous reduction in inductive resistance of high-frequency wire of the locker. Then, by regulation of current frequency in the heating system, heating of the linear heating element is adjusted. The device comprises power supply and heating control system, heating system comprised of the feeding core and linear heating element made as metal conductor with cross-section selected to withstand weight of the heating system submerged to the well and electric current locker between the above components in the head part of heating system. Temperature sensor is placed in the head part of heating system; it is used to control temperature of the locker and its environment when the heating system is run down to the well. The feeding core is made of twisted and isolated conductors, locker is made as winding of high-frequency wire wound onto ferromagnetic core and placed inside the metal shell, the core by its end parts is closed to this shell.
EFFECT: improving reliability and enlarging functional capabilities of the heating system.
2 cl, 3 dwg
