DEVICE FOR HYDRAULIC FRACTURING OF FORMATION Russian patent published in 1996 - IPC

FIELD: oil and gas producing industry, stimulation of oil and gas and water beds. SUBSTANCE: device for hydraulic fracturing of formation includes casing string with through longitudinal channels. Installed on casing string are guide casings with radial ports. Placed in guide casings are prisms which close radial ports. Prisms are spring-loaded to each other and form cavities between them which are communicated with cavity of casing string. Device is provided with source of vibration excitation which is made in form of cavitation generator. This generator has diffuser, radial through recesses below the diffuser and check valve. This valve is located under the radial through recesses. Cavitation generator is built-in for its installation in casing string and coincidence of its radial through recesses with through longitudinal channels of casing string. EFFECT: higher efficiency of formation stimulation due to production of powerful impact pulses and reduced expenditures for placing the formation into operating conditions. 2 cl, 3 dwg