SU1615310A1 - Roller bit - Google Patents

Abstract

The invention relates to roller cone bits for drilling wells. The purpose of the invention is to improve the manufacturability of the cone and increase its durability. The bit of the drill bit contains a peripheral rim and main rims on which asymmetrical teeth 3 with bases are located. The tooth 3 is formed by a falling edge (SG) 5 and an incident edge (NG) 6. The depressions between adjacent teeth 3 are the dihedral angle formed by the SG 5 of the previous one and NG 6 of the subsequent teeth. The plane of symmetry 7 of the dihedral angle is offset against the course of rotation of the roller cutter parallel to the vertical diametral plane 8 passing through the previous tooth 3 located in the working position. The tooth 3 is made with an additional SG 9 located from the middle of the height of the tooth 3 to its base parallel to NG 6. The plane offset the symmetry of the dihedral angle parallel to the vertical diametral plane is achieved in the process of milling the teeth 3 by an angular disk milling cutter with a symmetrical profile. This simplifies the setting of the production line and eliminates the defective parts. The additional SG 9, parallel to the NG 6, allows the tooth 3 to fully work out without increasing the axial load and increases the durability of the cone. 1 hp f-ly, 2 ill.

Description

Phie.g

, The invention relates to the construction of wells, namely drilling cones

chisels

The purpose of the invention is to improve the manufacturability of the cone and increase its durability.

FIG. 1 shows the drill bit cone; in fig. 2 - roller cutter in the working position, fragment.

The bit of the drill bit contains a peripheral rim 1 and main rims 2, on which asymmetrical teeth 3 with bases 4 are located. The tooth 3 is formed by the escaping 5 and the incident edges. The valleys between adjacent teeth are a dihedral angle formed by the escaping face of the previous tooth and the incident face, the next tooth with a plane of symmetry 7 displaced against the course of rotation of the roller cutter, parallel to the vertical diametral plane 8 passing through the previous tooth positioned in the working position. Tooth. 3 are made with an additional converging face 9 located from the middle of the height of the tooth to its base 4 parallel to the incident face 6.

The drill bit is working

in the following way.

The tooth of the peripheral rim 1. having a positive slip (or made with a symmetrical profile), and the tooth of the 3 main rims 2, having a negative slip, destroy the rock at the bottom of the well. In the process of drilling, the tooth 3 of the main rim 2 interacts with the bottom of its incoming face 6, which is shorter than the falling 5, which reduces the blocking of the zone of destruction. In order to improve the manufacturability of teeth on the main rims 2 with negative slip, an angular disk milling cutter with a symmetrical

the profile is displaced parallel to the vertical diametral plane of the cutter by an amount varying from the largest at the apex to the smallest at the crown with zero slip. Such a parallel cutter displacement allows a much lower torque, affecting the roller cutter during milling, and the symmetrical profile of the cutter simplifies the setting of the technological line and the production cycle, and also eliminates the defective parts.

Making the teeth 3 with an additional running edge 9 located from the middle of the height of the tooth to its base parallel to the incoming face 6 allows you to fully work out the armament without increasing the axial load on the bit, and thereby increase the durability of the roller cutter. 0 Formula of invention

Claims (2)

1, Drill bit sharoshka containing. on the main crowns there are asymmetrical teeth with bases, formed by the escaping and incident faces, and depressions between 5 teeth with the plane of symmetry of the dihedral angle formed by the escaping edge of the previous tooth and the incident face of the subsequent tooth, displaced n and 30 a shch so that, in order to improve the manufacturability of manufacturing a cone, the plane of symmetry of the dihedral angle is shifted parallel to the vertical diametral plane, passing through 35 yduschy tooth. 2. A sharoshka pop. 1, characterized in that, in order to increase the durability of the roller cutter due to a more complete wear of teeth 40 in height, the tooth is made with an additional falling edge located from the middle of the height of the tooth to its base parallel to the incoming face. Phie.1