PULSED HYDRAULIC BOREHOLE PERFORATOR Russian patent published in 1996 - IPC

FIELD: oil production. SUBSTANCE: borehole perforator included several units and sections. Lower section is made in the form of hydraulic fixer-centering guide with rods extended under higher pressure. Radial passages with pressure pulse generator units inside are made in the middle and upper sections. The generator is made in the form of shaft and turbine. Turbines are coupled to upper part of the shaft. Flat cams are secured to shaft ends. The cams come in contact with discs. The discs are used as members of closing-opening of eccentric openings. Extensions are placed in lateral openings of the discs. Inlet lengthwise passages of cases in the middle and upper sections entering radial passages are tangentially directed to the turbines. Outlet axial passages are hydraulically open between cavities of radial passages and cavity of lower section. EFFECT: high reliability. 4 dwg