METHOD OF INTERVAL MULTISTAGE HYDRAULIC FRACTURING OF FORMATION IN OIL AND GAS WELLS Russian patent published in 2017 - IPC E21B43/267 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to methods of developing oil and gas fields by horizontal wells and can be applied to implement the interval multistage hydraulic fracturing of the formation. The method includes interval descent of cumulative perforator with the use of coiled tubing, performing perforation in horizontal sections of production string, cement annulus, rock (production formation), pumping fracturing fluid and proppant into production formation for forming and fixing fractures after hydraulic fracturing, interval installation in horizontal sections of production string of packers. The cumulative perforator with packer is lowered at the first stage of the hydraulic fracturing, and the cumulative perforator with packer is used for preparation of further stages of hydraulic fracturing. In this case, a composite explosive packer-plug is installed in front of the perforator with a seat chamber used as a packer withstanding pressure drop of not less than 700 atm. At that the packer-plug is connected to the perforator by means of a connecting device, and for initiation of the composite explosion packer-plug and the cumulative perforator, a cable-channel (geophysical cable) passed through coiled tubing is used to transmit various encoded electric pulses. At that one pulse initiates powder charge for installation and disconnection of the composite explosion packer-plug from the cumulative perforator, and the other pulse initiates the cumulative perforator. At that the installation of the packer-plug and perforation is performed in one descending-ascending operation.

EFFECT: increased processability of the method.

5 cl, 21 dwg