MULTI-ZONE COMPLETION WITH FORMATION HYDRAULIC FRACTURING Russian patent published in 2016 - IPC E21B34/14 E21B43/16 E21B43/26 

FIELD: mining.

SUBSTANCE: group of inventions relates to downhole tool for use in oil and gas wells and, particularly, to completion with openings equipment, which can be used for formation hydraulic fracturing in multi-zone wells. Well shaft completion equipment includes casing string assembly with plurality of casing string links and at least one adapter coupling for connection of casing string links. At least one adapter coupling comprises tubular housing having internal flow path and at least one hydraulic fracturing opening made with possibility to create hydraulic connection between adapter coupling outer surface and inner flow path. Equipment includes piece of flexible tubing string. It is installed in casing string assembly. Flexible tubing string includes internal flow path. Between flexible tubing string and casing string assembly annular space is formed. Drill string bottom assembly is connected to flexible tubing string. Drill string bottom assembly comprises formation hydraulic fracturing opening. It is made with possibility of hydraulic connection creation between flexible tubing string internal flow path and annular space. Equipment includes packer. It is installed in specified place to enable contact with at least one adapter coupling during packer operation. At that, packer is made with possibility of annular space above packer isolation from annular space under packer, so that fluid medium passing downwards along flexible tubing string, can flow out of formation hydraulic fracturing opening, thus creating pressure drop at packer to open hydraulic fracturing opening.

EFFECT: higher reliability of formation hydraulic fracturing in multi-zone wells.

21 cl, 21 dwg