SYSTEM AND METHOD FOR RE-HYDRAULIC FRACTURING IN MULTI-ZONE HORIZONTAL WELLS Russian patent published in 2018 - IPC E21B43/26 E21B43/14 

FIELD: mining.

SUBSTANCE: group of inventions refers to mining and can be used for re-hydraulic fracturing in a multi-well borehole. Packer on a tubing string is described and pumped into this column a deflecting material that can be used to isolate a fracture cluster in a multi-zone horizontal well in which hydraulic fracturing of the formation was previously performed. After performing the hydraulic isolation, a hydraulic fluid may be injected into the tubing string to conduct a re-hydraulic fracturing of the formation in this previously fractured hydraulic fracturing cluster to increase production of hydrocarbons from this horizontal well. Tubing string may include a test device for determining whether a repeated hydraulic fracturing of the formation is necessary in a particular fracture cluster within the horizontal well. Deflecting material can be pumped into the tubing string and is located next to the fracture cluster for hydraulic isolation of the latter during the re-hydraulic fracturing of the formation. After completion of individual fracturing processes in all the required fracture clusters along a horizontal well, the deflecting material can be removed from this horizontal well by purification.

EFFECT: increased efficiency of hydraulic fracturing.

20 cl, 11 dwg