DOWNHOLE DEVICE AND METHOD OF ITS USE FOR HYDRAULIC FRACTURING OPERATIONS Russian patent published in 2025 - IPC E21B34/14 

FIELD: mining.

SUBSTANCE: group of inventions relates to oil and gas industry. Downhole device for hydraulic fracturing operations includes a housing, a ball valve and a sealing element, supports configured to extend from the housing and connected to a pusher. Pusher is connected to magnetic half-coupling, which is made with possibility of linear back-and-forth movement. Magnetic rotary half-coupling is installed coaxially to magnetic half-coupling connected to pusher. Linear electric drive is connected to rod designed to fix position of magnetic rotary half-coupling. Electronic control unit comprises magnetic field transducer to feed control signal to linear electric drive. Magnetic half-couplings have working surfaces with identical number of pairs of opposite magnetic poles located opposite each other and installed on the base from magnetically soft material. In order to implement the method for insulation of part of the formation during hydraulic fracturing operations, the proposed device is arranged in the area of hydraulic fracturing couplings with magnetic marks. Sequence number of the coupling for the device location is entered into the device control unit and the device is supplied to the well. Signal is supplied from the device control unit when passing through the magnetic mark corresponding to the sequence number introduced at the first stage, to the linear electric drive, the retracting rod, which holds the rotary magnetic half-coupling. Magnetic half-couplings are connected. Thrusts are extended at pusher motion and the device is braked and arranged in hydraulic fracturing coupling the number of which is entered into control unit of the device at the first stage. Formation fluid flow is shut off with ball valve.

EFFECT: improving reliability of the device with the possibility of determining and installing the device in that zone of the well in which treatment is necessary, as well as providing accurate fixation of the device in a certain zone of the well for formation treatment.

6 cl, 7 dwg