DEEP-SEATED SOLID-FUEL HEATER Russian patent published in 2007 - IPC E21B36/00 

FIELD: oil production industry, particularly thermal well bottom zone treatment in metal mining industry.

SUBSTANCE: solid-fuel heater comprises fuel container with grid bottom protected with plug located from bottom outside. The heater also has ignition mechanism body, hollow piston mowing downwards under the action of weight member, hollow piston retaining member, which fixes piston in upper position and air flow shifting unit including channels and valve pairs. Heater comprises cylinder filled with inflammable mix. Fuel container has air supply channel, which delivers air into fuel via perforated pipe. Ignition mechanism body is made as a cup with air flow shifting unit embedded in cup bottom. Hollow piston is located at cut bottom. Hollow piston retaining member is retaining ring arranged in groove turned in inner cup surface. Cylinder with inflammable mix is connected to hollow piston.

EFFECT: increased simplicity, economy and reliability.

2 dwg