BOREHOLE PERFORATION DEVICE Russian patent published in 1997 - IPC

FIELD: oil and gas production. SUBSTANCE: device contains backing strip and jet charge string with common sequential-blasting line made in the form of detonating cord with cylindrical core. A series of initiation heads are also available, each of them executed with socket to connect jet charge, entries, initiation charge, and axial channel. Transverse and longitudinal channels are filled with explosive. Initiation charge is placed in bottom part of socket. Axial channel links transverse channel and initiation charge. Detonating cord is made in the form of segments connected with entries of transverse channels. Diameter of the latter is the same as that of axial channels. Length of transverse and axial channels constitutes, respectively, 2 and 3 their diameter values. EFFECT: increased reliability of initiation of each jet charge in string, diminished specific weight of explosive in initiation path, simplified suspension of device, and reduced dynamic loading on well string. 2 dwg