SYSTEMS AND METHODS FOR FORMING CAVITIES AND PERFORATION CHANNELS IN WELL Russian patent published in 2011 - IPC E21B43/11 

FIELD: oil and gas production.

SUBSTANCE: according to one of versions system consists in forming cavities in borehole of well and contains perforation column with dimension allowing placement in well and containing perforation unit. Further, the system consists of an anchor mechanism for securing the perforation unit in a borehole and of a tool of multi-cycle step-by-step transfer for selective transfer of the perforation unit at preliminary specified increments. The tool has a working run corresponding to dimension of a made perforation cavity. According to one version of the method, it includes formation of cavities in the borehole of the well and consists of the following stages: connection of the perforation unit and the tool of multi-cycle step-by-step transfer into the perforation column, transfer of the perforation unit and the tool of multi-cycle step-by-step transfer into a slant borehole of the well, and control over step-by-step transfer of the perforation unit by means of the tool of multi-cycle step-by-step transfer with the working run corresponding to dimension of the formed perforation cavity.

EFFECT: raised efficiency of making required perforation channels or breaks of formation.

30 cl, 10 dwg