SU144800A1 - Rolling bit - Google Patents

Description

Known roller bits with the use of teeth of various shapes.

The proposed roller bit, in order to increase the durability and more efficient destruction of the rock, was carried out using prismatic and spherical teeth, arranged with their successive alternation. Prismatic teeth, set in a direction transverse to the cone forming the cone, are alternately displaced in both directions relative to the axis of the spherical teeth.

FIG. 1 shows the proposed chisel; in fig. Figure 2 is a pattern of damage to the teeth of the roller cones.

The proposed cone bit with a combined armament of cones is intended for drilling wells in hard rocks intermingling with strong ones.

The prism-shaped teeth / cones, which are located along the cones forming the cones, and the teeth 2, which are located on the circumference of the cones on each rim, are black through one with carbide teeth 3 of spherical shape, fixed in the body of the cone.

In order to more completely overlap the bottom and more effectively destroy the rock, the axis of the prismatic teeth 2 on the rims are alternately displaced in both directions along the cone-forming (in a checkerboard pattern) relative to the axis of the teeth 3 of a spherical shape.

To create a shock effect and increase the specific pressure at the bottom (more effective destruction of the rock), the teeth 3 of spherical shape on each rim are separated by depressions from the prism shaped teeth.

Bearing 4 of the bit has a double ball (lock) radial-stop bearing 5 for receiving radial and axial forces (in both directions) and keeping the cone from axial movements. For

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When balls are assembled in both bearings, one hole 6 serves.

Such a support structure, I have, and besides with other bearings, an e, a double ball lock bearing, ensures its greatest durability.

The flushing device of the bit, except for the central channel, has channels that pass through the trunnion of the foot and the apex of the roller cutter and supply part of the flushing liquid directly to the bottom in such a way that it provides the best cleaning of the slag.

The cross section of the hole at the apex of the roller cutter is smaller than the cross section of the hole in the trunnion, which creates (as part of the liquid passes through the support) at the end of the roller cutter, the screening layer prevents the slime particles from penetrating the bit support.

The Verve-Serginsky machine-building plant produced an experimental batch of bits of the proposed design.

Testing them under industrial conditions in the oil fields of the Bashkir Economic Council gave good results, namely, increasing the penetration per bit and mechanical speed in a number of stratigraphic horizons, respectively, to 25 and 37% compared to the work of serial bits in similar conditions.

In all used bits, the support was in a healthy condition.

In conclusion, the Central Design Bureau of the Ministry of Geology and Preservation of the Mineral Resources of the USSR notes the novelty of the proposed bit, consisting of insert carbide inserts and milled prismatic and spherical teeth.

It is noted that the design of the support of the roller cones of two roller bearings increases the resistance of the bit with respect to the axial forces arising during the operation of the bit.

The flushing system in the proposed bit contributes to a good cleaning of the bottom, and also ensures the cleaning of bearings from abrasive sludge.

Subject invention

Roller bit with the use of teeth of various shapes, characterized in that, in order to increase the durability of the bit and more effective destruction of the rock, it uses prismatic and spherical teeth, arranged in a sequence of alternating, and prismatic teeth, installed transverse to the cone forming cone direction, offset in both directions relative to the axis of the spherical teeth.