METHOD OF SELECTIVE FLOW OPENING AND FIXATION OF COMPLICATED SECTIONS OF BOREHOLE Russian patent published in 2010 - IPC E21B29/10 E21B7/20 E21B33/10 

FIELD: oil-and-gas production.

SUBSTANCE: it includes selective flow opening of section with application of washer fluid, reaming of hole, sectional descent of overlapping devices in the form of shaped tubes by opening of stratum with expansion of overlapping devices hermetic lapped in the direction top-down without constriction of internal diametre. Before opening of all interval of complicated sections it is implemented its analysis and it is defined safe length of development range, outfitted from the bottom by profile section with diametre at extension exceeding diametre of extension of the rest profiled sections. Top end of the first section of profile overlapping devise is installed higher than complicated section, and the bottom end of the last section - lower than particular section.

EFFECT: it extends functional capabilities of profiled overlapping device, it provides alignment of connected overlapping per one round-trip operation of sections of overlapping devices, increasing safety of opening of range ensured by selection of length selective flow opening, and also reduces loading at beading of connection ensured by specific implementation of profiled sections at the bottom end of overlapping sections.

3 dwg