HYDRAULIC SANDBLASTING BOREHOLE PERFORATOR Russian patent published in 1996 - IPC

FIELD: secondary opening productive horizontal wells. SUBSTANCE: device has lower section made in the form of filled with oil fixer-centering guide with extended rods. The device has the middle and upper sections. The sections are similar. One radial passage is originated in diametrically opposite sides. Cases spring loaded on outside with spring rings are placed in radial passages. The cases may be revolved. Long hydromonitor extensions are placed and sealed with fluoroplastic rings in the passages. The extensions are made of hard alloy. Inlet lengthwise passages entering radial passages are originated tangentially in the area of blades. Inlet lengthwise passages are originated on opposite sides with respect to hydromonitor extensions. EFFECT: improved well opening. 4 dwg