DOWNHOLE SOLID-FUEL HEATER Russian patent published in 2013 - IPC E21B36/00 E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: downhole solid-fuel heater includes cylindrical fuel container with meshed bottom that is protected with a plug on the outside and housing of ignition mechanism made in the form of a shell. A bottle in the form of a cylinder closed with plug with igniting mixture on both ends is placed inside the shell. Besides, heater includes air flow switching station consisting of a hollow piston-striker, valves forming the channels together with piston-striker, locking members fixing the air flow switching station in upper position, which moves downwards under action of the load. At that, cylindrical fuel container is perforated. Besides, holes are covered with plugs. Housing of ignition mechanism is equipped with a cover plate. In the cover plate there arranged is air flow switching station consisting of a hollow piston-striker having side holes, valves forming the channels together with piston-striker, locking members fixing the piston-striker in upper position and made in the form of spring-loaded pins. Pins are located in side holes on inner surface of the cover plate. On the outside, housing of ignition mechanism is equipped with radiator rings. Besides, housing of ignition mechanism has the diameter that is smaller than that of fuel container and is connected to it by means of a coupling, the hole of which is provided with a perforated plug with collar-cutter on its upper surface.

EFFECT: improving heater safety and reliability.

2 cl, 2 dwg