HYDRAULIC SLOT-HOLE SKIVING PUNCHER Russian patent published in 2009 - IPC E21B43/112 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil industry, specifically to slot-hole puncher design of double-action skiving. The puncher contains the body 1 with in-built piston puller 2 with hydraulic central channel 3 and hydraulic offtakes 4 with jet head 5. The body 1 contains edge tool that is rotary cutter 6 with longitudinal profile S-shaped similar providing possibility of two simultaneous diametrical slots. The cutter 6 consists of the body 7, e.g., brick-shaped and made of toothed cutters 9 rigidly attached to the body 7, mounted by two sides thereof and provided with toothed leading edge 10 designed as bow-shaped convex circuit. The leading edge 10 is made as contoured teeth 11. The cutter 6 is mounted on the central axis 12 and supplied with moving mechanism consisting of two mirror-positioned deflecting wedges 13 and 14 mounted by longitudinal axis and provided with wedge surface 15 and 16 interacting with the body 7 of the cutters 6. Herewith the wedge 13 interacts with the piston puller 2 and is to be a wedge piston for turning the cutter 6, while the second wedge 14 is guide for returning the cutter 6 in folded position and spring-loaded with return spring 17. Both wedges 13 and 14 are interconnected by rigid junction 18, e.g. plate, to longitudinal slot 19.

EFFECT: provided qualitative punching, design simplification and reliable performance.

11 cl, 4 dwg