DEVICE FOR MULTISTAGE HYDRAULIC FRACTURING OF FORMATION AND METHOD FOR MULTI-STAGE HYDRAULIC FRACTURING OF FORMATION USING DEVICE THEREOF Russian patent published in 2021 - IPC E21B43/26 E21B34/14 

FIELD: mining.

SUBSTANCE: invention relates to the extractive industry, in particular, to the multistage hydraulic fracturing device and to the multistage hydraulic fracturing method with the help of the proposed device during the oil and gas reservoirs development. Disclosed is multistage hydraulic fracturing device comprising: well assembly, including at least two couplings arranged on tubing string in well shaft, wherein each of the couplings has a cylindrical housing with an inner cavity with a central through channel and a side opening providing radial communication between the central through channel and the well shaft, as well as a movable bushing installed in the cavity of the coupling, and a tool for moving the movable bushing so that the said side hole can be opened or closed. At that, on inner surface of movable bushing there is a profile in form of two circular extensions with collar between them, made with chamfers located on both sides of collar, and tool is installed on movable process string of pipes, arranged in through channel of tubing string, and is equipped with hydraulically expanding in radial direction dies with spring-loaded outward extension elements, allowing tool to be engaged by sliding elements on profile on inner surface of movable bushing with thrust in upper or lower end of profile.

EFFECT: technical result consists in expansion of arsenal of facilities for multi-stage hydraulic fracturing of reservoir with increase in their reliability.

18 cl, 2 dwg