METHOD AND DEVICE FOR CARRYING OUT MULTI-STAGE HYDRAULIC FRACTURING OF FORMATION Russian patent published in 2018 - IPC E21B43/26 E21B34/14 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry and can be used to develop oil and/or gas reservoirs by horizontal wells with a multi-stage hydraulic fracturing of the formation in both carbonate and terrigenous reservoirs. Performing method of multi-stage fracturing involves sequentially activating the devices with a fracturing step after activation of each of the devices, at that the activation being carried out by dumping the saddle with the ball into the well and selling them to the corresponding device in the proppant sales phase during the hydraulic fracturing of the previous stage. Multi-stage hydraulic fracturing of formation device includes a coupler for fracturing, a saddle for opening the clutch and a ball for overlapping the cross-section of the seat, the clutch having a sealed sleeve. Barrel sleeve has a profile for engaging the seat with a corresponding seat having a counter profile when it is sold through the wellbore.

EFFECT: technical result is to increase the efficiency of hydraulic fracturing of formation.

3 cl, 4 dwg