RU1781411C - Cone-drill bit - Google Patents

Abstract

Usage: drilling wells for various purposes. SUMMARY OF THE INVENTION: a cone drill bit comprises paws with trunnions. Roller cutters with milled teeth are mounted on the trunnions by bearings. The reinforcing element is located on the inverse cones of the cones. The reinforcing element is made on one of the sides located at an acute angle to the opposite side of the element. The latter is placed on the side of the incident part of the tooth. The top of the acute angle is located on the side of the axis of the cone. The side of the reinforcing element located on the side of the cone axis is not more than half the width of the fixing element. 1 s.p. f-ly, 2 ill.

Description

FIELD OF THE INVENTION This invention relates to cone drill bits used for drilling wells for various purposes.

A cone drill bit is known that contains paws with pins mounted on pins by means of cone bearings with milled teeth and a reinforcing element located on the cones of the cone. Moreover, the reinforcing element covers the entire reverse cone of the cone except for a small space of 4 ... 6 mm.

The disadvantage of this device is that during the drilling process a high energy intensity occurs due to the large area of contact of the cone with the walls of the borehole. High energy intensity causes additional braking of the cone, leading to wear of weapons. In the process of mining a bit with milled weapons, wear of the reverse cone occurs mainly in the lower part of the tooth. The upper part of the tooth (located on the axis of the cone) is slightly subject to wear. Therefore, in such a device, the implementation of the reinforcing element on the inverse cone of the cone continuous is not justified.

The closest technical solution to the proposed one is a cone drill bit with milled teeth, on which the reinforcing element has parallel sides on the cones on the cones and there is a free space of 4 ... 6 mm and jumpers 1 mm between the reinforcing elements. However, despite the fact that the reinforcing element is reduced in size due to the presence of a bridge and free space between them, the energy intensity of the bits is high and the disadvantages described above are inherent in this device.

The aim of the invention is to increase the efficiency of the bit by reducing the energy consumption during its operation.

This goal is achieved by the fact that on the reverse cone of the cone reinforcing element is made with one of the side

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ron, located at an acute angle to the opposite side of the element, located on the side of the incident part of the tooth, and the apex of the acute angle is located on the axis of the cone.

The side of the reinforcing element located on the side of the cone axis is not more than half the width of the reinforcing element. .,

In FIG. 1 shows a General view of the section of the bit; in FIG. 2 is a view along arrow A in FIG. 1.

The cone drill bit consists of paws with trunnions 1 on which HS rolling and sliding bearings 2 are mounted with 3 cones with milled teeth 4. On the peripheral crown 5 on the inverse cone 6 there are grooves 7 for accommodating the reinforcing element 8 of width I. The grooves 7 are made by the method milling. The reinforcing element 8 is made from one of the sides located at an acute angle a to the opposite side of the element, located on the side of the incident part of the tooth. Moreover, the top of the acute angle is located on the side of the axis of the cone.

One of the options for the implementation of the reinforcing element on the cones is as follows: a ruler is installed - a template with a width of 1 ... 1.5 mm at an angle a in the groove 7. Then hardfacing is performed by hard alloy currents of high frequency or by gas. During solidification of the hard alloy, the template is removed.

Other options for forming the reinforcing element on cones are not ruled out. For example: before hardfacing, part of the groove 7 is filled with quick-hardening material (gypsum

catfish) or with an easily abrasive material (brass, lead), then surfacing is carried out.

The chisel works as follows.

When rolling cones, the destruction of the face occurs. The cones, which have a reinforcing element that does not completely fill the grooves of the inverse cone, significantly reduce their energy consumption during operation. Their excessive slippage along the bottom is eliminated and, as a result, wear of the weapon is reduced, the destruction of the face is more intense, especially when drilling hard rock. Taking into account that the wear of the teeth mainly occurs in the lower part close to the bottom, where the reinforcing element has a maximum value, its reduction in the direction of the cone axis will not affect the stability of the cone armament as a whole.

Claims (2)

1. A brown roller cone topped, containing paws with trunnions mounted on the trunnions by means of roller cones with milled teeth and a reinforcing element located on the inverse cones of the cone, characterized in that, in order to increase the efficiency of the bit due to a decrease in energy consumption during its operation, the reinforcing the element is made from one of the sides located at an acute angle to the opposite side of the reinforcing element, located on the side of the incident part of the tooth, and the top of the acute angle is located and from the cone axis. 2. A chisel according to claim 1, characterized in that the side of the reinforcing element located on the side of the cone axis is not more than half the width of the reinforcing element. AT 4 ri. 1 dida FIG. 2