RU1802067C - Step-shaped drilling bit - Google Patents

Abstract

Usage: drilling wells. SUMMARY OF THE INVENTION: A chisel comprises a body with rock-breaking elements. Transverse sludge-guiding grooves, central and lateral flushing channels are made on the body. The diameter of the central channel is 0.15-0.25 of the diameter of the bit. The diameter of the side channels is 0.6-0.8 of the diameter of the central channel. A recess is made at the bottom of each transverse groove. The recess communicates with the side channel and extends to the side surface of the housing. The width of the recesses is 0.4-0.6 of the diameter of the side channel. The outlet openings of the side channels are removed from the axis of the bit by a distance of 0.3-0.5 of the radius of the bit. 2 s.p. f-ly, 3 ill. ate with

Description

FIELD: mining. SUBSTANCE: invention relates to mining, in particular, to a cutting tool for drilling boreholes in a coreless method in alternating hardness rocks of categories I-VII for drillability.

The aim of the invention is to capture productivity by more efficiently removing and sludge from the bottom of the well during drilling.

In FIG. 1 shows a stepped bit, side view; in FIG. 2 - flushing channel: in FIG. 3 is a section AA in FIG. 2.

The bit keeps the body 1, carbide inserts 2, flushing channel 3, transverse sludge-conducting grooves 4, side flushing channels 5, recesses 6.

The diameter DI of the central flushing channel 3 is from 0.15 to 0.25 of the diameter of the drills D, and the diameter of the side channels 5 is from 0.6 to 0.8 of the diameter DI of the central channel 3, and a recess is made in the bottom of each transverse groove 4 6, one end communicating with the side channel 5 and the other extending to the side surface of the housing 1, the width of the recess 6 being equal to the diameter of the side channel 5, and its depth L being from 0.4 to 0.6 of this diameter.

The outlet openings of the side channels are spaced apart from the axis of the body (bit) 1 by a distance g of 0.3 to 0.5 of the radius of the bit. The recesses 6 are rotated relative to the axis of the bit in the direction opposite to the direction of rotation of the bit.

The body of the bit has a thread at one end for connection with a drill pipe string (not shown in the drawing), and at the other end a working end, which is three concentric steps, divided into three sectors by sludge-removing grooves 4.

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The stepped bit works as follows:

Flushing fluid enters the central channel of the bit through the drill pipe string. The fluid flow rushes to the bottom at high speed and, having captured particles of the destroyed rock from the center 3 of the bit end face, enters the annulus through the lateral channels 5 and through the transverse sludge-conducting grooves 4 and the recesses 6. In this case, the core formed in the central channel is destroyed under the influence of vibrations of the projectile and the oncoming fluid flow and is removed into the annulus through the lateral channels 5, the transverse sludge-conducting grooves 4 and the recess 6.

With sharp recesses of the bit into the plastic rock, the wash liquid stream begins to circulate through the recess 6 located at the bottom of the transverse sludge-conducting grooves 4 into the annulus.

As a result, the drilling process proceeds without stopping and pressing the mud pump.

Using the proposed bit provides, in comparison with existing bits, the following advantages: the ability to drill wells in rocks moving on drillability. In one run, without replacing the tool when measuring at the bottom of the rock; increased mechanical drilling speed; reduction in drilling fluid flow while drilling under conditions of complete absorption.

The step bit is an effective tool for drilling wells in trans

5

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breeding rocks. The use of bits increases the productivity of drilling operations by 150-170%.

Claims (3)

1. A stepped bit containing a housing, rock-cutting elements located at the working end of the housing, transverse sludge-removing grooves made in the working end of the housing, central and side washing channels made in the housing, from which the central channel communicates with the transverse grooves, and each side channel exits in one of the transverse grooves, characterized in that, in order to increase the productivity of the drilling process in moving rocks due to more efficient removal of sludge from the bottom of the well, the diameter of the central channel is 0.15-0.25 of the diameter of the bit, and the diameter of the side channels is 0.6-0.8 of the diameter of the central channel, with a recess in the bottom of each transverse groove communicating with the side channel at one end and the other at the other the side surface of the housing leaving the tea, the width of the recess being equal to the diameter of the side channel, and its depth is 0.4-0.6 of this diameter. 2. A bit according to claim 1, characterized in that the outlet openings of the side logs are removed from the axis of the bit and the distance is 0.3-0.5 of the radius of the bit. 3. A bit according to claim 1, characterized in that the recesses are rotated relative to the radius of the bit in the direction opposite to the direction of rotation of the bit.