SLOT ON SHAFT OF ANTI-FLYING DEVICE OR PACKER Russian patent published in 2013 - IPC E21B23/01 

FIELD: oil and gas industry.

SUBSTANCE: slot on a shaft of an anti-flying device or a packer includes shortened A and elongated B vertical sections connected through inclined slot F. Sections A and B are adjacent by means of two U-shaped slots - upper C and lower D ones. Upper U-shaped slot C has vertical section E being the continued part of slot A, and V-shaped cutout that is connected through slot F to the vertical elongated section B. Lower U-shaped slot D has inclined section G, vertical section H that is parallel to slot E, and V-shaped cutout that is formed with two inclined sections K and L. Slot L is connected to vertical elongated section B. Projection M is formed between upper C and lower D U-shaped slots on the shaft body of the anti-flying device or the packer.

EFFECT: enlarging application scope of a slot; achieving flexibility of design and manufacture; improving operating reliability of an anti-flying device or a packer.

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