METHOD OF INCREASING OIL AND GAS WELL PRODUCTIVITY AND DOWNHOLE HEATER FOR METHOD EMBODIMENT Russian patent published in 2001 - IPC

FIELD: oil and gas industry. SUBSTANCE: method may be used for activation or restoration of oil and gas wells by thermochemical treatment and cleaning of well space from asphalt-resinous and paraffin depositions. The method includes loading of carbon- and oxygen-containing substances into well not above upper boundary of well perforation interval. Oxidation reaction of mixture is initiated. Upon completion of reaction, performed interval of well zone is treated with crystallizing solution of potassium nitrate and reaction of its oxidation is initiated. Mixture of carbon- and oxygen-containing substances is lighted up with the help of downhole heater located in well at level not above upper boundary of its perforation. Oxidation reaction is conducted at temperature governed by operating conditions of said well. Downhole heater, prior to lowering into well, is put into operation by connecting with power source, then connector is disconnected. Heater is lowered into well on rope and kept there up to completion of oxidation reaction of mixture. Downhole heater has hollow cylindrical body accommodating heating element. Current lead in upper and lower parts of heating element is connected to power source. Current lead is connected to heater with the help of sealed cable connector. The device body has upper and lower covers, rod installed with its one end on upper cover and located along body axis. Secured to rod is body with its upper circular stop. Fuel cell is located round the rod. Lower circular stop is installed for its motion along rod with the help of pressing down nut. Heating element is installed in lower part of fuel cell for tight contact with it. Upper and lower stops are installed in body with a clearance. Fuel cell of heater may be made in the form of package of annular fuel blocks tightly pressed against one another, or in the form of bulk fuel powder. EFFECT: higher efficiency of oil and gas production due to activation or restoration of wells by restorations of hydrodynamic communication of well with fluid-bearing formation. 10 cl, 2 dwg