INSTALLATION FOR HYDRAULICALLY AFFECTING FORMATION Russian patent published in 1997 - IPC

FIELD: oil and gas production. SUBSTANCE: invention deals with oil-field equipment for treatment and hydraulic fracturing of productive formation in bottom zone. Installation contains tubing string connected to external connecting pipe executed with radial holes opposite packaging units. Pump-compressor pipe string is also available with guide ways for balls and piston with channel. Guide ways are made such as to enclose pump-compressor pipe string in tubing string. Pump-compressor pipe string enables reciprocation of piston in the internal connecting pipe. Packaging units are made in the form of elastic members with conical ends and conical cavities forming annular cavities with external connecting pipe. Piston has spring-loaded valve to prevent too high pressure in the hollow of pump-compressor pipe string. This hollow, through piston channel, radial ports of external and internal connecting pipes, communicates with hollow of production string between external connecting pipe and packaging units. EFFECT: enhanced efficiency in affecting formation.