SYSTEM AND EQUIPMENT FOR MULTI-STAGE HYDRAULIC FRACTURING Russian patent published in 2021 - IPC E21B43/267 E21B17/16 

FIELD: oil and gas industry.

SUBSTANCE: present technical solution generally relates to the field of hydraulic fracturing of oil and gas formations, and in particular to multi-stage fracturing with controlled impact on selected zones along the wellbore in order to create multiple cracks. The activation element is designed to move down the barrel of the casing located in the well to interface and move the sliding sleeve connected to the casing to open one or more holes in the casing and contains a cylindrical hollow body passing between the upper end and the lower end and having two nearest edge parts passing between the upper end and the lower end. Moreover, the two edge parts are separate and movable relative to each other. The seat pocket is made with the possibility of receiving a plug to close the inner hole, while the outer surface of the hollow body contains one or more protrusions and/or grooves made with the possibility of mating with one or more corresponding grooves and/or protrusions of the sliding sleeve. A system is also proposed for controlled exposure to selected intervals along the wellbore with a fluid under pressure.

EFFECT: increase in the efficiency of well operation after multi-stage hydraulic fracturing (MSHF).

16 cl, 31 dwg