FORMATION HYDRAULICFRACTURING Russian patent published in 2017 - IPC E21B43/267 

FIELD: mining.

SUBSTANCE: method involves lowering to a well of a pipe string, pumping of a gelled fluid via the pipe string into the productive formation interval with the formation of fractures, fixing of fractures by pumping of gelled fluid with proppant covered with a rubber sheet. In addition a drill is lowered on the pipe string to the production well to the formation sole, pairs of perforations along the well perimeter are made upwards where each perforations pair is shifted at an angle. After drilling the pipe string with the drill is removed from the well. Then the pipe string with a packer is lowered to the well, the packer is seated in the well, formation hydraulicfracturing is made with pumping of gelled fluid with formation of fractures. Further, a crosslinked hydrocarbon-based gel rim is pumped into the fracture in the amount of 0.2 of the volume of the pumped gelled fluid. Fixing of fractures is performed in two stages. The volume of the remaining gelled fluid is divided into two equal parts, and fixing of the fracture is performed with proppant 20/40 and 12/18, covered with a rubber-polymer composition, in equal shares by weight at both stages. At the first stage the fracture is fixed by pumping the first part of the gelled fluid with proppant 20/40, covered with the rubber-polymer composition, and at the second stage the fracture is fixed with the second part of the gelled fluid with proppant 12/18, covered with the rubber-polymer composition.

EFFECT: improvement of the formation hydraulicfracturing efficiency and reliability.

1 tbl, 5 dwg