METHOD FOR IMPROVING OF HYDRODYNAMIC CONNECTION OF WELL WITH PRODUCTIVE FORMATION Russian patent published in 2017 - IPC E21B43/267 E21B43/114 

FIELD: mining.

SUBSTANCE: method involves conducting formation hydraulic fracturing (FHF) by lowering to the well of a pipe string, installation of a central bolt on the upper end of the pipe string, pumping along the pipe string of a fracture fluid under the open central bolt, enforcing formation fracture pressure to form fractures and fixing of the fracture with a proppant. The pipe string end is provided with a hydraulic jet nozzle, equipped with axially pairwise arranged nozzles with a check-valve at the bottom. The diameter of each nozzle is equal to six diameters of proppant grains, a hydrosandblast perforation is performed additionally in the productive formation interval. Thereafter FHF is performed with a pumping of fracture fluid for 2.0 m³, starting with flow of 0.6 m³ with a stepwise increase of 0.2 m³, a diagram is plotted that shows correlation of the fracture fluid flow from the pressure created on every pumping stage and the rock burst pressure of the productive formation is determined, then fractures are fixed via pumping of proppant with the fluid-carrier, after FHF the central bolt is closed waiting for the pressure to decline. The nozzle drift diameter depends on the burst pressure where the wellhead pressure should be 0.8 of the formation fracture pressure, a gutter capacity is tied with the central bolt with a bleed line, consisting from the well to gutter capacity of pipes, air gauge, tap and a nozzle, after the bleed line is installed the central bolt is periodically opened, the air gauge measures the pressure in the bleed line up to the tap and close the central bolt, when the wellhead pressure achieves 0.8 of the burst pressure, then the tap is opened, the pressure is released through the nozzle to the atmospheric pressure.

EFFECT: reducing length and complexity of the FHF, guaranteed production of a fracture in a predetermined direction, improving efficiency of cleaning fractions from the pumped fluid during FHF, improving method reliability.

4 dwg, 2 tbl