METHOD AND DEVICE FOR GAS-DYNAMIC ACTION APPLICATION TO RESERVOIR Russian patent published in 2007 - IPC E21B43/263 

FIELD: oil well operation, particularly methods for stimulating production by forming crevices or fractures with the use of explosives.

SUBSTANCE: method involves performing perforation within the bounds of formation to be treated; assembling uncased sectional charge by passing composite rod through central channel of the charge having developed surface; bringing charge sections together and tightly pressing charge sections one to another; arranging gas flow splitter, which diverts gas flow generated during charge sections, below assembled charge sections, wherein the splitter is provided with through orifices,; lowering charge in well; combusting charge sections to increase temperature, create gaseous combustion products and pressure pulses; performing additional chemical and thermal reservoir treatment along with gas-dynamic treatment thereof. To provide chemical and thermal reservoir treatment several reagents are delivered to perforation interval. The reagents are filled in sealed cavities if air-tight container. Container interior is defined by central charge section channel and gas flow splitter interior. The reagents may be mixed with hot explosive to bring reagents into reaction during charge section combustion, failure of container or container cavity air-tightness. Device comprises uncased charge sections formed of compositions, which provide charge burning in aqueous, oil-water and acid media. The charge sections have central channels with developed combustion surfaces to provide predetermined burning time and pressure enough for hydraulic fracturing of reservoir. Device also has fitment made as composite metal rod passing through central channel of each charge section, gas flow splitter adapted to divert gas flow and provided with through orifices, centering rings arranged between charge sections and having diameters exceeding charge section diameters, and means to provide safe charge burning and centering in well. The gas flow splitter is located below assembled charge sections. Central channel of charge sections and gas flow splitter interior are made as chamber adapted to deliver several reagents to treatment interval. To provide container air-tightness container joints are hermetical. Centering rings impart air-tightness to charge section joint areas during device assembling. Splitter orifices are isolated from environment with case or plugs, which provide splitter seal breakage during charge section burning. Air-tight pads are arranged between splitter and charge sections. Container is divided into cavities to deliver several regents to treatment interval. The cavities are formed so that during charge section burning cavity seals are broken and reagents may be mixed with the use of hot explosive gases. Charge section diameters, central channel configurations and inner splitter volume provides necessary volume of reagents to be supplied to reservoir treatment interval.

EFFECT: possibility to create cracks and cavities in well bore zone, improved bottomhole formation zone cleaning of mudding products, decreased oil viscosity due to reagent delivery to reservoir interval to be treated and reagent mixing with the use of hot gas.

20 cl, 1 dwg