SU1216319A1 - Crown bit - Google Patents

Description

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The invention relates to a rock-breaking tool, namely, drill bits with a double core pipe.

The purpose of the invention is to improve the performance of the drill bit by improving the cleaning of the bottom hole from cuttings.

FIG. Figure 1 shows a drill crown with a partial tear-out of the total inner end {fig. 2 - the same, view from the side of the working end.

The drilling crown contains a working body 1 with flushing channels 2, working sectors 3 reinforced with rock-breaking elements 4 and separated by end faces 5 connected to longitudinal edges 6 on the inner and outer surface of the body 1. The large channels 2 are located at the front edge of the working sectors 3 and are inclined at an angle oi equal to 40-50 °, in the direction of rotation of the crown, and the longitudinal grooves

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6 are shifted relative to the flushing channels 2 towards the rear face of the previous working sectors 3. The crown operates as follows.

during drilling, the stream of cleaning agent (air or flushing fluid) flows through channels 2 to the face, due to the inclined arrangement of channels 2 in the direction of rotation of the sludge in front of the working sector 3, which eliminates re-grinding by rock-breaking elements 4. Location of longitudinal grooves

6 near the rear face of the sectors 3 located in front of the rotation of the crown, leads to the fact that the cleaning agent does not change direction through the grooves 6 is removed from the bottom

from the well with sludge in the direction of the wellhead.

This contributes to a better cleaning of the slag from the sludge and increases the efficiency of the crown.

FIG. 2

Compiled N.Panin. Editor N.Bobkova Tehred M.Parotsay Proofreader M.Pojo

Order 969/35 Circulation 548 Subscription to the Supreme Soviet of the USSR State Committee

for inventions and openings 113035 ,, Moscow, Zh-35, Raushsk nab. 4/5

Filial PSh1 Patent, g, Uzhgorod, st. Project, 4

Claims (1)

A DRILLING CORE containing a hollow body with reinforced perforated elements - working ¹ sectors, separated by end grooves connected with flushing channels and longitudinal grooves on the outer and inner side surface of the body, with a lance. I mean that, in order to increase the efficiency of its work by improving the cleaning of the bottom of the well, the flushing channels are located at the front face of the working sectors, and the longitudinal grooves on the inner and outer surfaces of the body -. at the rear face, while the washing channels are inclined towards the longitudinal grooves. S9 SU., „1216319 1> 1,121