SU1481373A1 - Rotary-drilling bit - Google Patents

Abstract

The invention relates to the drilling of wells. The purpose of the invention is to increase drilling performance and bit durability while reducing dust generation. The chisel includes a body 1 with a shank 2, two feathers / P / 3 and carbide plates / TP / 4 fixed to them with a positive rake angle, the main cutting edge 5 in the form of a broken line with a point of inflection at the top 6 of the PZ, outer 7 and inner 8 side cutting edges. On the front edge of TP 4, a groove 9 with inclined walls is formed, forming an obtuse angle between them. The intersection line 11 of the walls of the groove 9 passes through the tops 6 P 3 parallel to the axis of the bit. The intersection points 12 and 13 of the cutting edges 5 with the cutting edges 7 and 8 of the TP 4 lie in the same diametral plane. During the operation of the bit, the cutting edges 5 and partially the edges 7 and 8 destroy the rock. The presence of P 3 facilitates chipping of the rock and its removal from the cutting zone without re-shredding. Placing the intersection points 12 and 13 in the same diametral plane ensures the operation of the adjacent sections of TP 4 in compression mode, which prevents the destruction of the cutting edges and corners of TP 4. 3 Il.

Description

FIG. /

The invention relates to the drilling of wells, namely drill bits for rotary drilling.

The purpose of the invention is to increase drilling performance and bit durability while reducing dust generation.

FIG. 1 shows a chisel for rotary drilling, general view; in fig. 2 - the same view from the working end; in fig. 3 - the same, side view. The chisel includes a body 1 with a shank 2, two feathers 3 and carbide plates 4 fixed to feathers x 3 at a positive rake angle (L 0). Each plate 4 has a main cutting edge 5 in the form of a polyline, a line with a point of inflection at the top 6 of the feather, an outer 7 and an internal H side cutting edges. On the front face of the plates 4, a groove 9 is made with inclined walls 10 forming an obtuse angle between them (K 90). The line 11 of the intersection of the groove walls passes through the top 6 of the pen parallel to the axis of the bit, and the points 12 and 13 of the intersection of the main cutting edges 5 with the corresponding side cutting edges 7 and 8 of the plates lie in the same diametral plane.

Chisel works as follows

Under the action of torque and axial load, the bits of the bit penetrate into the rock and destroy it with cutting edges. The presence of a blunt groove on the front face of the carbide plates allows a rake angle that is variable along the length of the main cutting edge of these plates, and the sloping walls of the groove provide targeted movement of products

3 / J "

FIG. 2

Editor N. Tupitsa

, J tuti Compiled by V. Yakimov

Tehred A. Kravchuk Proofreader M. Vasiliev

destruction by slaughter. Placing the points of intersection of the main cutting edges with the corresponding lateral cutting edges of the plates 1 in one diametral plane creates favorable conditions for the operation of these sections of the plates in compression mode. As a result, the cleavage of the rock and its removal from the cutting zone without over-grinding by side edges and edges are facilitated, and the destruction of the cutting edges and angles of the plates is prevented. All this provides an increase in drilling performance and durability of the bit while simultaneously reducing dust generation.

Claims (1)

Invention Formula Chisel for rotary drilling, comprising a body with a shank, two feathers and carbide inserts fixed on them with a positive rake angle, the main cutting edge in the form of a broken line with a point of inflection at the top of the feather, outer and inner lateral cutting edges, characterized in that in order to increase drilling performance and durability of the bit while reducing dust generation, a groove with inclined walls forming an obtuse angle between the front face of carbide inserts and the liner intersection of walls of the slot extends across the top of the pen ,, parallel to the bit axis and an intersection point of the major cutting edges to the respective side edges of the cutting inserts lie in the same diametral plane.