SU1752913A1 - Rotary drill bit - Google Patents

Abstract

Use: drilling of oil, gas and other wells. SUMMARY OF THE INVENTION: A roller bit consists of paws with trunnions, cones with truncated tops, equipped with carbide teeth. The roller cutter is provided with a core breaking rod placed in a through channel made on the truncated tip of the roller cutter. The core breaking rod has a possibility of reciprocating movement and is spring-loaded relative to the inclined end of the trunnion 2 or

Description

The invention relates to a drilling technique, namely to a rock cutting tool, and concerns drilling cone bits.

A roller bit is known, comprising a body with legs and pins, cones mounted on pins and made according to a self-cleaning scheme.

A disadvantage of the known chisel is the presence of undisguised portions.

The closest to the proposed technical essence is a roller cone bit containing paws with trunnions, on which are installed cones with truncated tops, equipped with carbide teeth.

The disadvantage of the known bit is the formation of the central part of the bottom, not affected teeth, and the presence of core columns as a result, the diameter of which increases as the teeth draw down in height.

This core absorbs the specific pressure on the face, reduces productivity and mechanical speed.

The purpose of the invention is to increase the productivity and mechanical speed of the bit by damaging the central core.

This goal is achieved by the fact that a drilling roller bit containing paws with trunnions, on which cones with truncated tips are installed, equipped with carbide teeth, is equipped with a core rod, the slider is made with a through channel at the truncated tip, and the end of the trunnion end / is inclined. to the bottom of the trunnion, the core breaking rod being placed in the through channel with the possibility of reciprocating movement and springing relative to the inclined end of the trunnion.

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1752913

FIG. 1 shows a roller cone section of a roller cone bit, longitudinal section; FIG. 2 - part of the cutter with a core-destructive core, retracted into the body of the cutter.

Rolling bit chisel contains paws 1 with trunnions 2, on which roller cones 3 with truncated vertices C are mounted, Roller 3 is equipped with carbide teeth 5 and equipped with a core-destructive rod 6. At truncated vertex k of roller 3 3 there is a through channel 7, which is installed with the possibility of the translational movement of the core-breaking rod 6. The end face 8 of the end part 9 of the trunnion 2 is made with the slope to the bottom of the trunnion 2 towards the loading zone. The core-forming core 6 is spring-loaded, by an elastic element 9 relative to the inclined end 8 of the trunnion 2. In this example of embodiment, the roller cutter 3 is fixed on the trunnion 2 by the locking element 10.

The axis 11 of the through channel. 7 is made predominantly parallel to the axle axis. The elastic element 9 is made in the form of an elastic tape, fixed at one end in the roller cutter 3, and the second in the core breaking rod 6, which with its sliding ends 12 communicates with the Inclined end 8 of the trunnion 2. The impact end 13 of the core-destroying rod 6 interacting with core, has a flight greater than the flight of teeth 5.

The roller cone bit works as follows.

When the bit is driven in on the bottom, the roller cutter 3 with the armament 5 destroys the rocks. As the bit deepens,

a core, which is affected by a core breaking rod 6, which, with its impact end 13, cleaves it. The progressive movement of the core breaking rod 6 is carried out by interacting with the inclined end of trunnion 2 / As the cone 3 rotates 3, the core fracture rod, being constantly pressed against the inclined end 8 by the elastic element 9, is buried in the body of the cone, spinning from the center of the well (Fig „2), In this position the core is destructive

5 rod 6 is not prone to breakage, as it is not in contact with the face.

This embodiment of the bit allows to destroy the central core column,

thus increasing production and mechanical speed.

Claims (1)

Invention Formula 5 Drill cone bit containing paws with trunnions, on which are mounted cones with truncated tops, equipped with carbide teeth, different 0 by the fact that, in order to increase the productivity and mechanical speed of the bit due to the damage of the central core, it is equipped with a core breaking rod, the roller cutter is made with a through channel at the truncated top, and the end of the end-part of the trunnion is inclined to the bottom of the trunnion, and The core fracture rod is placed in the through channel with the possibility of reciprocating movement and is spring-loaded relative to the inclined end of the trunnion. five 1 W 2