METHOD FOR WELL BOTTOM ZONE TREATMENT Russian patent published in 2006 - IPC E21B43/18 E21B43/24 E21B37/00 

FIELD: oil production industry, particularly increased efficiency of well treatment due to fuller removal of paraffin-tar and asphalt deposits with sandy-argillaceous impurities and improved well bottom zone pore and channel cleaning of the deposits.

SUBSTANCE: method involves delivering device including air chamber with atmospheric pressure and receiving chamber to well bottom, wherein the device is connected to wireline and the receiving chamber is formed of alternating layers made of two types of hard composition materials, namely of the first hard composition material, which evolves small amount of gas during combustion and the second hard composition material, which evolves large amount of gas during combustion; combusting receiving chamber in layers to generate compressed hot gaseous combustion products within treatment interval and to provide hot combustion gas penetration in reservoir pores and channels to melt deposits present therein. Before combustible diaphragm activation cyclic wave hot gas action is applied to reservoir with amplitude of not less than 2 MPa and at repetition frequency of not less than 5 cycles per 1 minute.

EFFECT: improved efficiency of well bottom treatment characterized by sandy-argillaceous impurities.

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