METHOD OF REPAIR OF OIL AND / OR GAS WELLS AND DEVICE FOR ITS IMPLEMENTATION (OPTIONS) Russian patent published in 2018 - IPC E21B43/267 E21B43/112 F04F5/02 E21B29/00 

FIELD: mining.

SUBSTANCE: group of inventions relates to mining, oil and gas production, in particular to variants of a method and apparatus for repairing oil and / or gas wells, including perforation and hydraulic fracturing of the formation (hereinafter, HFF). In the first variant of the method, the device is lowered into the well to a depth corresponding to the productive formation, the supply of working fluid under pressure to the tubing cavity and a perforator, through the destructive elements of which the hydraulic communication of the production string with the formation is provided at least one level of the productive formation. Then a packer is installed above the productive formation, a hermetic separation of the sub-packer and below-packer annular space is carried out, and the circulation windows of the perforator are opened. After that, the hydraulic fracturing fluid is fed into the tubing at a pressure corresponding to the fracture pressure of the formation, and the fracturing is carried out until fracture cracks are formed, followed by fixing them. Then by pumping the working fluid under pressure into the jet pump, a pressure drop is created in the sub-packer zone and the productive formation. At the end of the process, the packer is brought into an inoperative position and the device is removed from the well. In the second method, there is no need to forcibly extract the fracturing fluid onto the surface. Device for repairing oil and / or gas wells in the first variant comprises a jet pump, a packer and a perforator. Pump comprises a housing with a sealing sleeve, where an insert with an ejector assembly is freely mounted. Packer contains a fastening mechanism in the production column and elastic elements. Perforator has a body in the upper part of which the circulating windows are made where their free area is not less than the area of the flow tube section of the tubing and in the lower part of the body radial holes are made in which the destructive elements are installed. In the internal cavity of the hammer body, the hub is displaceable with respect to the housing and the drive element in contact with the destructive elements. In the device according to the second variant there is no jet pump.

EFFECT: technical result consists in expanding the technological capabilities of the method and the device, while improving the quality of the hydraulic fracturing and reducing the risk of damage to the production string.

4 cl, 12 dwg