FIELD: oil and gas industry, removal of paraffin hydrates, asphalt-resin-paraffin and other deposits.
SUBSTANCE: gear to liquidate asphalt-resin-paraffin and hydrate deposits includes steel cylindrical body with cone-shaped nosepiece carrying nozzle on its lower end. Body houses combustion chamber with fuel element and oxidizer and ignition system. Cooling chamber which walls are covered with hard sublimation coolant is positioned in body between combustion chamber and cone-shaped nosepiece. Ammonium oxalate (NH4)2C2O4H2O which mass amounts to not more than 30% of mass of fuel element is utilized as sublimating coolant.
EFFECT: expanded application field of gear due to reduced rate of fuel burning, prolonged time of action and reduced temperature of combustion products.
4 cl, 1 dwg
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