PULSE PRESSURE GENERATOR FOR WELLS Russian patent published in 2003 - IPC

FIELD: oil and gas producing industry, particularly, devices for mechanical and heat stimulation of formation products of combustion of pyrotechnic composition. SUBSTANCE: stimulation of formations consists in melting of asphalt-resinous-paraffin deposits and reduction of oil viscosity in well zone of formation. Pulse pressure generator has perforated body accommodating successively arranged along its axis solid combustion charges and igniting device. Solid combustion charges are made from high-energy pyrotechnical composition forming in well conditions of high-temperature combustion products reacting with well fluid and solid deposits of well zone and containing insoluble oxides retarding heat exchange process in well and forming gas-vapor phase with building-up pressure pulse lengthy in time. Solid combustion charges are placed into airtight shells from material with melting point below temperature of combustion of pyrotechnical composition. Solid combustion charges are installed for contact their end faces with one another. End faces of pyrotechnical charges have protrusions and sealed places of their contacts. EFFECT: increased efficiency of stimulation of formation bottomhole zone and higher operate reliability of generator with its unchanged overall dimensions. 3 dwg, 1 tbl