METHOD OF GAS-HYDRAULIC STIMULATION OF FORMATION Russian patent published in 2002 - IPC

FIELD: oil recovery means. SUBSTANCE: method includes performance of deeply penetrating perforation over entire intervals of treated formation, assembly of capsule-type sectional charge by passing parts for assembly of charge sections through central channel of each section and tightening of charge sections to one another by other assembly auxiliary parts. Then, charge is lowered into well and its sections are burnt. Charge sections are made of compositions ensuring burning in water, water-oil and acid media after starting of ignition unit and subsequent ignition of one or several ignition sections of charge and main sections of charge with formation of combustion products, building-up of pressure and temperature rise. Pulse action of gases with high temperature and pressure is produced. For which purpose, charge is used whose section burning time is less that time of propagation of compression wave through well fluid from interval of action initiation to wellhead. For this purpose, burning of charge sections over entire surface is effected. Configuration of central channel is taken with developed surface. Charge is assembled by passing auxiliary rod through central channel of each charge section. Sections are tightened and pressed to one another by centralizers. Located between lower centralizer and charge sections is dissipator of gas flow. Sum of passing holes of dissipator is calculated os as to provide for minimal load exerted onto rod and maximum action on formation. Installed between upper centralizer and charge sections is compensator o linear expansion of charge at high temperature in well. EFFECT: provided formation of fractures and cavities in bottom-hole zone of treated formation of ensure reliable hydrodynamic communication with remote formation zone possessing natural filtration properties, i.e., production of formation fracturing. 2 cl, 1 dwg