SU1441055A1 - Diamond crown bit - Google Patents

Abstract

The invention relates to the drilling of rocks and M. b. used in drilling exploration wells. The purpose of the invention is to increase the productivity of drilling by increasing the service life of the diamond crown. It contains a housing 1 with a diamond-containing matrix divided by flushing channels 5 into separate sectors (C) 3. In the course of rotation, a part of each C 3 is made in the form of second-order surfaces, the end part of each C 3 can be made in the form of a paraboloid of rotation with segments formed by C 3 sides. If a crack occurs in the crown's path, then cutting it or other irregularities occurs smoothly at the junction point of the paraboloid of rotation with the rest of C 3. The C 3 surface is in the form of second-order surfaces ive resource crowns. 1 hp ff, 2 ill.

Description

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The invention relates to the drilling of rocks and can be used in the national economy in the diamond core drilling of exploration wells.

The aim of the invention is to increase the productivity of drilling by increasing the service life of the diamond drill bit.

FIG. 1 shows the proposed diamond crown; in fig. 2 is a geometric image of a matrix sector cut by a paraboloid of rotation.

A diamond crown consists of a body 1 with a thread 2 under the core tube, a diamond-containing matrix of individual sectors 3 with a face 4 in the direction of rotation, made in the form of a second-order surface, separated by continuous channels 5. The face during rotation part 4 of the sector 3, made in the form of a paraboloid of rotation with segments formed by the lateral outer 6, lateral inner 7 surfaces, the working surface 8 and the front face 9, is reliably protected by the rear face 10 of the preceding sector.

The principle of operation of an al.diamond drill bit is as follows.

In the process of drilling wells, the diamond bit is transmitted through the drilling rig.

projectile rotation and axial load, i.e. the crown is pressed to the bottom of the hole and rotates. If there is a crack in the path of the alumina crown, then the end face 4 of the bit 3 of the crown does not get caught or hit by a protrusion or other unevenness of the bottom hole, since

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the end face 4 is made in the form of a paraboloid of rotation formed by the lateral outer surface 6, the lateral inner surface 7, the working surface 8, the conjugation of which produces a paraboloid of rotation in

 the end part of the sector 3, securely protected by the rear face 10, while cutting the protrusion of a crack or other unevenness occurs smoothly at the junction point of the paraboloid of rotation with the rest

10 part of sector 3.

Eliminating the interaction of the face in the direction of rotation of the sector of the diamond drill bit with a protrusion of a crack or other unevenness at the bottom of the well by performing it as a second-order surface (for example, a paraboloid of rotation) increases the service life of the diamond crown.

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Claims (2)

1. A diamond bit crown, including a housing with a diamond-containing matrix, divided by flushing channels into separate sectors, differing from those m, c. The purpose of increasing the productivity of a drill is by increasing the service life of a diamond crown, butt-on during the rotational part of each sector is made in the form of second-order surfaces. 20 2. The crown according to claim 1, characterized in that the end part of each sector in the course of the rotation is made in the form of a paraboloid of rotation with segments formed by the sides of the sector. d