CUMULATIVE PERFORATOR Russian patent published in 2019 - IPC E21B43/117 

FIELD: blasting operations; mining.

SUBSTANCE: invention relates to equipment for perforating and blasting operations in oil and gas wells. Cumulative perforator comprises a sealed housing accommodating a perforated pipe for orientation of cumulative charges and charge initiators, two peripheral groups of charges and one central charge. Boundary groups of charges are equipped with charges of deep penetration, located in equal quantity on edges of sector. Central group is equipped with charges creating holes of large diameter located at the centre of the sector. Each separate charge in the group is located relative to the perforator housing so that the perforation jets during the detonation are directed at angle from 30° up to 90° to plane perpendicular to perforator axis, and jets of charge groups in one section of perforator are directed to plane in adjoining formation.

EFFECT: higher permeability of rock in the bottomhole zone of the well and increased fracturing due to dissection of bottom-hole zone perforator by sectors and inside zone of intersecting cumulative jets of groups of charges.

1 cl, 5 dwg