SU1633077A1 - Drilling roller bit - Google Patents

Abstract

The invention relates to a rock-destroying tool, namely a roller bit of a roller type. The goal is to increase the operational durability of the bit by increasing the number of carbide inserts on the peripheral rims of the cutters and eliminating the formation of undisclosed sections on the face. The cutters are mounted on paws with trunnions and equipped with carbide inserts (TV) 4 with protruding parts 5. One of the cutters has a two-way peripheral rim (DPV) 6 with well-forming 7 and the adjacent 8 rows of TV 4. TV 4 are located at different angles to the axis 9 of the roller cutter. The remaining cones have a single-sided peripheral crown (OPV) 10. On a cone with DPV 6, each pair of TV 4 from rows 7 and 8 lies in the same plane passing through the forming 11 cones and the axis 9 of the cone. The TV 4 is arranged on the roller cutter with OPV 10 with the possibility of overlapping with its protruding parts 5 of distance 12 between TV 4 on the ABS and a variant of orientation of TV 4 with the cutting edge on the DPV 6 perpendicularly forming a cone 11 and on OPV 10 — along By forming 11, iodine by the action of axial load and torque, TV 4 is introduced into the rock and the bottom hole is destroyed. The device provides a complete overlap of the bottom of the radius of the bit TV 4 and the maximum saturation of the DPV 6 TV cutter 4. 4. Il. with SS (L SG 03 SO O 1 1

Description

The invention relates to a rock-breeding tool, namely, level roller cone bits.

The purpose of the invention is to increase the expres- sion of bit resistance due to the magnitude of the number of carbide rates on the peripheral crowns and the elimination of the formation of non-exposed areas at the bottom of the pitch.

Figure 1 presents the chisel, obiy view; Fig. 2 is a diagram of a lesion.

The roller bit contains 5 ups 1 with trunnions 2 and the cones 3 mounted on them. The cones 3 are equipped with carbide inserts 4 with 3 parts protruding above the cones 3. One of the cones 3 has a two-row 20 peripheral rim b with a borehole forming 7 and adjacent to There are 8 rows of carbide inserts 4 located at different angles to the axis 9 of the roller cutter 3, and the rest is a single-sided peripheral rim 10, On a roller cutter with a two-strand peripheral rim 6 each pair of inserts 4 of the wellbore 7 and adjacent to 8 rows of them are located in one the planes, the passage — 30 slashes through the cone forming 11 and the axis 9 of the cone 3. On the cone with a single-sided peripheral rim 10, the carbide insert 4 is positioned to overlap its protruding parts — 35 mi L of distance 12 between the inserts located in one plane on bottom peripheral rim 6.

The principle of operation of the bit is as follows .40

Under the action of axial load and torque of the insert 4, the cones 3 are inserted into the rock and the destruction of the bottom hole is carried out. Destroyed rock is carried by the flushing fluid to the surface.

The proposed scheme for the reinforcement of the peripheral part of the cones completely excludes the contact of the cones of the cones with the bottom of the well due to the complete re-, -Q of the bottom face along the bit radius with solid inserts. This eliminates the likelihood of the mills on the undisturbed annular areas of the bottom and thereby increases the penetration and the mechanical speed of drilling. At the same time, the maximum saturation of the two-row peripheral rim of the roller consoles is ensured by inserts, which is of decisive importance in the destruction of hard and hard rocks.

The use of wedge-shaped inserts in a number of cases (for certain types of rocks) has an advantage over hemispherical working head inserts. This advantage is particularly pronounced when drilling plastic rocks.

A variant of arming the inserts with wedge-shaped working heads is provided, while the well-forming row of inserts on the cone with two rows of inserts on the peripheral rim is oriented with the cutting edge of the working head perpendicularly forming the cone of the cone, and the similar row on the other cone and the adjacent row of inserts - along forming a cone.

The installation on two cones of the bore-forming inserts oriented with cutting edges perpendicular to the forming cone provides a high-quality calibration of the borehole walls, which facilitates the work of the bore-producing insert on the third cone, oriented cutting edge along the forming cone.

The use of this bit armament scheme makes it possible to increase its durability and reduce the energy intensity of the process of rock destruction.

Claims (1)

Invention Formula A roller bit chisel containing paws with trunnions and mounted on them, equipped with carbide inserts with protruding parts, is tapered cones, of which at least one has a two-strand circumferential rim with a well-forming and adjacent rows of carbide inserts located at different angles to the cutter axes and the remaining cutters have a single-sided peripheral crown, characterized in that, in order to increase the operational durability of the bit by increasing the number of carbide inserts on the periphery cone rims and the avoidance of the formation of non-overlapped areas at the bottom, on a cone with a two-sided peripheral rim each pair of carbide inserts from a well-forming and adjacent the rows are located in the same plane passing through the cone forming and the axis of the cone, while the cones on the cone with a single-sided peripheral crown insert are arranged overlap the distance between the inserts located in the same plane on the roller cone with a two-sided peripheral rim with their protruding parts. 1