PROCEDURE AND DEVICE (VERSIONS) FOR GENERATION OF HIGH-VELOCITY JET STREAMS FOR PERFORATION OF WELLS WITH DEEP UNLINED CHANNELS AND OF LARGE DIAMETRE Russian patent published in 2011 - IPC E21B43/117 F42B1/02 

FIELD: oil and gas production.

SUBSTANCE: procedure for generation of jet streams consists in initiating open-frame of framed charge of explosive. At the end of the charge, at the side opposite to charge initiation, there is made a recess. The recess is lined with inert material. Further, the procedure consists in throwing, accelerating and compressing material of cumulative lining with products of detonation of explosive, in its colliding on axis of charge symmetry and in generating jet stream. During the process of throwing and compression of cumulative lining it is additionally effected by forced interaction of cumulative lining with one or several additional components, due to their collision and due to parts of material of cumulative lining sliding relative to an additional component. Simultaneously, parts of material of cumulative lining are turned at angle of convergence on axis of symmetry of charge over 180 degrees and not exceeding 360 degrees, also, parts of material of cumulative lining are collided on axis of symmetry of charge at angle over 180 degrees and not exceeding 360 degrees with generation of jet stream.

EFFECT: increased efficiency of secondary exposure of producing reservoirs, generation of crack network in reservoir and facilitation of hydro-dynamic communication of well with producing reservoir at large zones of dirt at reservoir bottomhole zone.

28 cl, 20 dwg