SU29434A1 - Reamer chisel - Google Patents

Description

Patent No. 20614 describes a chisel-extender, sliding halves which, with their jagged sectors, are rotatably fixed on axles that have been passed through the bit of the bit. at the end of the last bit and intended for washing the bottom and cooling of the cutting bits of the bit; In the proposed modification of the reamer bit, the piston is placed below the incisors and connected to them with the help of earrings, and a bypass channel is used to bring water under the piston.

In FIG. 1 is a side view of the bit, partially cut away in FIG. 2 - view from the front.

The proposed chisel - expander (Fig. 1) consists of a steel body / at the ends of a hollow, with an internal channel 7 for passing the solution supplied by a thrusting pump., And from the self-expander placed in the body / and consisting of a piston 2, leads 3, cutters 4 and fingers 5.

The solution, coming through the drill pipe, enters the upper hollow end of the expander body, from where it passes through channel 7 to the lower end of body 7, where, as it exits the channel, it creates back pressure of the piston 2.

The piston 2, under the action of the backpressure force of the fluid, lifting up, expands with the help of leads 3 cutters 4, which, expanding, exit through the window 8 of the housing 7 (Fig. 2) and simultaneously with the drilling of the well produce its expansion.

The subject matter of the invention.

Modifying the reamer bit described in Patent No. 20614, characterized in that the piston 2 is placed below the cutters 4 and connected to them with earrings 3, and a bypass channel 7 is used to bring water under the piston.

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