Patent ID: 11891886
Assignee: nan
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A method for selective processing of a number of intervals of a productive formation, comprising the steps of: providing a borehole associated with the productive formation; providing a well casing within the borehole; providing a tubing string inserted into the well casing; said tubing string defines a string external surface; providing a device essentially coupled with the tubing string; said device defines a device external surface; the string external surface and the device external surface together form a common external surface; wherein an annulus is defined as a space between the common external surface and the well casing; said device includes: an upper packer and a lower packer defining an inter-packer space therebetween; a hydraulic fracturing port located in the inter-packer space; a mechanical anchor located below the lower packer; and a perforator being in controllable hydraulic communication with the tubing string, and located below the mechanical anchor; lowering said device into the well casing to a depth corresponding to the productive formation; positioning said device at a predetermined interval chosen from said number of intervals; supplying pressurized working fluid through the tubing string to the perforator; carrying out a perforation of the well casing by the perforator, by punching sidewalls of the well casing and creating caverns in sidewalls of the borehole within the predetermined interval; providing washing out of the caverns; bringing the perforator into a transportation position; positioning said device so that the predetermined interval is located between the upper packer and the lower packer; fixing said device in the well casing using the mechanical anchor; blocking access of the working fluid to the perforator; supplying fracturing fluid under pressure into the tubing string and into the inter-packer space; activating the upper packer and the lower packer thereby providing separation of the predetermined interval from the annulus; providing hydraulic fracturing of the productive formation by the fracturing fluid; reducing a pressure of the fracturing fluid in the inter-packer space; transferring said device into the transportation position; and removing said device from the well casing.