METHOD OF GAS-VAPOUR RECEIVING IN DOWNHOLE GASIFIER AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2009 - IPC E21B43/24 

FIELD: oil-and-gas industry.

SUBSTANCE: group of inventions relates to oil-and-gas production field and can be used for enhancement of oil and gas extraction by means of thermogas dynamic action on productive stratum by steam-gas, produced at the bottom level. In downhole gasifier at any submerged length of gasifier at first it is fed air into combustion chamber with peak discharge through the cooling duct of combustion chamber and flow passage, implemented with critical parametres of flow for maximum rating. Then there are fed water and fuel with peak discharge. Additionally fuel is injected into section with critical air flow parametres at condition of availability of water consumption of particular value and it is arranged inflammation of formed air-fuel mixture. Water is mixed to combustion products after burning front in area with falling pressure, which is created by narrowing and expansion of air-gas channel of combustion chamber. Device contains body, in which there are located combustion chamber, adjoinining to combustion chamber injector and mixing chamber, autonomic inflammation source, channels of air, fuel and water feed and measuring outfits. According to the invention combustion chamber is implemented with three co-axial cylinders. Hollow between external and middle cylinders is intercommunicated to air feed. Hollow between middle and internal cylinders is intercommunicated to hollow of combustion chamber through the injector, implemented with air flow channel in the form of diffuser with cylindrical nozzle of fuel feeding, co-axial in its inlet part. Additionally fuel inlet channel is outfitted by starting-isolation valve with sensitive component, chambers of which are intercommunicated before and after throttle component, located on water inlet channel. Mixing chamber is implemented in the form of tandem narrowing and extending channels, connected to each other with formation of annular slot, intercommunicated to water inlet, and outfitted by discharge ring, located after extending channel.

EFFECT: reliability enhancement of start at any submerged length of steam-gas generator into well, safety and high completeness of fuel combustion ensured by minimisation of external and internal factors on working procedure.

4 cl, 1 dwg