RU1781409C - Cone-drill bit - Google Patents

Abstract

Use: rock cutting element. SUMMARY OF THE INVENTION: a cone drill bit comprises support legs, cones, and a nozzle in a central channel. On the conical part of the nozzle, longitudinal through slots are made. The bit is equipped with flat slotted nozzles with lateral surfaces in the form of a triangle. The nozzles are fixed by the inlet on the edges of the conical part of the central nozzle. The inlet is directed into the inter-cone space and is oriented parallel to the plane passing through the axis of rotation of adjacent cones. 4 ill.

Description

The invention relates to a rock cutting tool, and in particular to devices of cone bits, characterized by channels or nozzles for supplying a purge agent to the bottom of the well.

Known cone drill bit containing support legs with peripheral channels between them, mounted on the legs of the cone, as well as tubular nozzles installed in the peripheral channels. This design helps to improve the quality of cleaning the peripheral part of the bottom of the well, but does not increase the productivity of drilling, because the central part of the bottom surface is not exposed to the jet stream of the blowing agent, and therefore, the required quality of cleaning the entire bottom of the well from the products of destruction of the drillable rock mass is not ensured.

Another roller cone bit is known, containing support legs with a central channel between them, mounted on the cone legs, and a nozzle with a conical part mounted on the central channel, on which longitudinal through cuts are made.

The possibility of supplying a jet of purge agent in the direction of the inter-cone space achieved by this design makes it possible to clean the central part of the surface of the bottom of the well by a value of 0.8-0.9 radius, however, a significant increase in drilling productivity is not achieved due to incomplete coverage of the area of the side of the core of the purge jet agent and the distance of the longitudinal through slots on the surface of the conical part of the nozzle from the surface of the bottom of the well.

The aim of the invention is to increase the productivity of drilling due to more intensive cleaning of the entire surface of the bottom of the products of the destruction of the drill rock mass directly supplied to it by a flat jet of blowing agent.

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This is achieved by the fact that in a device containing support legs with a central channel between them, mounted on the legs of a cone, as well as a nozzle with a conical part installed in the central channel, on which longitudinal through slots are made, at the edges of the slots of the conical part of the central nozzle with the inlet part fixed slotted gaps with a surface in the form of a triangle are fixed; moreover, their exit is directed into the inter-conical space and oriented parallel to the plane passing through the rotation axes x cones.

The application of the invention will increase the productivity of well drilling due to more intensive cleaning of the entire face of the bottom from the products of destruction of the drill rock mass directly supplied to it by a flat jet of blowing agent.

In FIG. 1 shows a general view of the bit; in FIG. 2 is a transverse section with the view of the cones in plan and the arrangement of flat slotted nozzles relative to them (the support legs are conventionally removed); in FIG. 3 - side view of the cones; in FIG. 4 is a spatial image of the central nozzle with a conical part and flat slotted nozzles on it, made of an elastic material.

The cone drill bit contains support legs 1, the upper part (according to the drawing) of which forms a nipple cone 2, and cones 3 are mounted on their other end so that an inter-cone space 4 is formed in plan view between adjacent cones and a central channel is installed between the support legs 1 nozzle 5 with a conical part 6, on which longitudinal through-cuts 7 are made, each of which is oriented into its inter-cone space 4.

On the edges of the slots 7, flat slotted nozzles 8 with lateral surfaces in the form of a triangle are fixed with their input part, and the edge 9 of the triangle,

facing the wall of the well, it is located at an angle a relative to its axis, ensuring the dispersion of the jet core over the entire radius of the face, and the output part of the flat nozzle is directed into the inter-cone space and oriented parallel to the plane passing through the axis of rotation of adjacent cones.

If necessary, the nozzle 5 with the conical part 6 together with the flat slotted nozzles 8 can be made of elastic material and mounted on bits with a cylindrical nozzle without a conical part. In this case, the slotted nozzles 8 will additionally perform the function

check valve and protect the bicuspid space from penetration of sludge when disconnecting the source of the purge agent.

Formulas A

A cone drill bit containing support legs with a central channel between them, mounted on the cone legs, and also a nozzle with a conical part installed in the central channel, on

which has longitudinal through slots, characterized in that, in order to increase drilling productivity due to more intensive cleaning of the entire face from the products of destruction of the drill rock mass directly supplied with a flat jet of blowing agent, it is equipped with flat slotted nozzles with side surfaces in the form triangle, fixed by the inlet part on the edges of the conical part of the central nozzle, and the outlet part is directed into the inter-cone space and the parallel is oriented to the plane passing through the axes

rotations of adjacent cones.

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Editor

Compiled by I. Yakimov Tehred M. Morgenthal

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PhysM

Proofreader O. Kravtsova