FORMATION HYDRAULICFRACTURING Russian patent published in 2017 - IPC E21B43/267 C09K8/80 

FIELD: mining.

SUBSTANCE: method comprises lowering to the well of pipe strings with a packer, seating of the packer, pumping gelled fluid along the pipe string in the productive formation interval to form a fracture, fixing fracture with pumping of the fluid-carrier with proppant covered with a rubber sheet, carrying out FHF, pressure relief and extracting of the pipe string from the well. Lowering pipe strings with a packer into the well is performed so that the lower end of the pipe string is above the roof of the formation for 1.5 m, total gelled fluid is computed with the following formula: V_g=k⋅H_P, where V_g - the total amount of gelled fluid, m³; k=11-12 - transfering coefficient, m³/m, for this case we assume k=11; H_P - height of the formation perforation interval, m, the gelled fluid is pumped via the pipe string in the productive formation interval to form a fracture, the remaining amount of the gelled fluid is used as the fluid-carrier for fracture fixing. Thus fracture fixing is performed in two stages, where at the first stage fluid-carrier pumping is performed with proppant 12/18 covered with rubber-polymer composition in the amount of 30% of the total amount of proppant, and at the second stage the fluid-carrier pumping is performed with proppant 20/40 in the amount of 70% of the total amount of proppant filled with glass fiber in an amount of 1.5% of the proppant weight pumped at the second stage, the packer is released and the pipe string with the packer is removed from the well.

EFFECT: improving method reliability.

2 dwg