HYDRAULIC FRACTURING PLUG Russian patent published in 2020 - IPC E21B33/12 E21B43/26 

FIELD: drilling of wells.

SUBSTANCE: invention relates to a device for use during formation of a plug during hydraulic fracturing. Device for use in forming plug during hydraulic fracturing of underground formation includes upper tubular retaining housing, plurality of sliding levers, sealing element. Upper tubular retaining body extends between the upper and lower ends and has an outer surface in the form of a truncated cone extending from its lower end. Plurality of sliding levers are arranged around outer surface of said retaining body. Each of the sliding levers passes between the upper and lower ends and has an inner surface, extending from said upper end corresponding to said outer surface of said retaining body. Outer surface is adapted for friction engagement with wellbore. Sealing element is located around outer surface of retaining housing above plurality of sliding levers. Sealing element is configured to move towards upper end of retaining housing by means of said plurality of sliding levers to provide an annular seal between the retainer body and the well shaft.

EFFECT: technical result is improved operational properties of the device.

27 cl, 19 dwg