METHOD FOR EXERTING THERMOCHEMICAL INFLUENCE UPON LAYER EXTRACTION AREA Russian patent published in 2004 - IPC

FIELD: oil and gas extracting industry. SUBSTANCE: method for thermochemical treatment of extraction area of layer with asphalt-resin-paraffin laydowns includes consecutive pumping of two compounds into extraction area, for which combustible oxidizing system is used, first compound of which includes ammonium nitrate and water, and second compound of which includes salt of nitrous acid - sodium nitrite and water. First compound additionally includes carbamide and catalyst - nickel nitrate, with following proportion of components in %. Ammoniac saltpeter - 15-65, carbamide - 2-18, nickel nitrate - 0.0005-0.05, water - the rest. Second compound includes said salt in amount of 15-65% and is pumped in amount 1.5- 4 times less, than first compound. Second compound additionally includes 0.0005-0.005% of corrosion inhibitor - hydroxy aldehydes. EFFECT: increased effectiveness of asphalt-resin-paraffin laydowns removal. 2 cl