METHOD FOR COMPLETING A HORIZONTAL SIDETRACK BOREHOLE FOLLOWED BY MULTI-STAGE HYDRAULIC FRACTURING Russian patent published in 2022 - IPC E21B43/26 E21B33/13 

FIELD: gas and petroleum industry.

SUBSTANCE: invention relates to the petroleum and gas industry, more particular, to the field of completing horizontal sidetrack boreholes and hydraulic fracturing. To implement the method for completing horizontal sidetrack boreholes, followed by multi-stage hydraulic fracturing, a cemented completion arrangement configured to rotate during lowering and cementing is lowered on a transportation column. The arrangement consists of, from bottom to top: a casing shoe, two check valves or a double check valve, an activation coupling, a stop branch pipe, a stepped hydraulic fracturing coupling, a shank suspension, a polished cone. The shank suspension activated in the production string and the shank is continuously cemented with rotation. After waiting for the cement to harden and controlling the tightness of seal on the tubing string, a stinger is lowered and docked with the adapter, frac reinforcement for hydraulic fracturing is installed at the wellhead. An arrangement consisting of, from bottom to top: a packer plug, a setting tool, a compensator, 2 to 5 sections of a cumulative perforator and selective translators in between, a coupling locator, and a cable end, is lowered through the tubing string on a cable or a flexible pipe. An electrical signal is sent to the setting tool by means of a cable, and the packer plug is activated. The next signal is supplied, and the 1st section of the cumulative punch is activated, repeating for each section. The tool is lifted and inspected. The hydraulic fracturing stage with a volume of 150 tons and a speed from 10 to 16 m³/min is performed, followed by repeating along the entire length of the horizontal section of the borehole. By means of the coiled tubing fleet, the shank is normalised by milling the plugs using insoluble packer plugs or flushing the horizontal section of the borehole. The borehole is developed, the stinger is removed, operation equipment is lowered in the tubing.

EFFECT: increase in the productivity of the borehole.

1 cl, 13 dwg