SU1661351A1 - Roller cutter drilling bit - Google Patents

Abstract

The invention relates to the drilling of shallow blastholes and is intended for drilling tools. The goal is to increase the durability of the bit by protecting the supports from cuttings. For this, the sleeve is made on the inner surface with an annular chamber communicated with the internal cavity of the nipple. The chisel has a nozzle, made with a solid partition and side windows under the partition and two rows over the partition. One of the rows is located above the annular chamber, the other - under the chamber. The nozzle at both ends is spring-loaded relative to the sleeve, which is arranged for the camera to communicate with the upper row of holes at the lower position of the nozzle and with the lower one located above the chamber next to the hole at the upper position of the reservoir. The flushing and blowing agent from the internal cavity of the drilling rod through the purge nozzle and the window enters the nipple cavity of the bit. From the latter, the purge agent enters the supports of the cutters through the channels and intensively flushes the bearings at an elevated pressure of the mixture, removing all foreign objects from the supports. 1 il.

Description

The invention relates to a drilling tool used in the drilling of shallow blastholes in the mining industry, in particular to roller cone bits with bottomhole blowing with compressed air or an air-water mixture.

The aim of the invention is to increase the durability of the bit by protecting the supports against cuttings.

The drawing shows a roller bit.

The roller bit contains paws 2 fixed to the nipple with channels 3 for blowing out supports. To paws 2 are fixed pins 4 on supports. The cones are mounted on the supports 5. The chisel contains a unit for forced washing and lubrication of the supports in the form

fixed to the nipple 1 of the sleeve 6 and located inside the sleeve 6 of the nozzle 7, which is installed with the possibility of axial movement. On the inner surface of the sleeve 6 there is an annular chamber 8 connected to the internal cavity 9 of the nipple 1. The nozzle 7 is made with a continuous partition 10 and side windows 11 under the partition 10 and two rows above the partition, one of which (12) is located above the chamber 8 and the other (13) - under the camera. The nozzle 7 is spring-loaded springs 14 and 15 relative to the sleeve 6.

Roller bit works as follows.

The chisel is connected to a hollow drilling rig by means of a conical locking

ABOUT

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thread. Becoming rotates the chisel and presses it to the bottom. Rolling over the face, the cones crush the rock with 5 teeth and deepen the well. A water-oil-air mixture (flushing-blowing agent) is injected into the internal cavity of the bed to remove the products of destruction.

The flow of the purge agent from the drilling rod enters the purge nozzle 7, presses the partition 10, compressing the upper spring 14, moves the purge nozzle 7 to the lowest position. In this case, the windows 12 are aligned with the annular chamber 8, and the windows 11 enter into the cavity 9 of the nipple 1 of the bit.

The flow of the washing mixture through the window 12 enters the chamber 8, and from it into the internal cavity 9 of the nipple 1 of the bit. From here, part of the flow through the channels 3 will go to the bearings of the cutters 5 for cooling and lubricating the bearings, and the other part through the windows 11 from the cavity 9 to the central hole of the purge nozzle 7 under the partition 10 and then goes to the bottom to clean the well. This is the operating mode of the well purge and by-pass lubrication of the bearings of the cutters during drilling.

If for any reason the well diving process is stopped and the bit stops in the well, the spring 14 is compressed and the purge nozzle 7 moves upwards. In this position, the windows 11-13 overlap the inner surface of the sleeve 6 over and over the chamber 8. As a result, since the wellbore space is always filled with contaminated liquid and sludge, in the cavity 9 of the nipple 1 of the bit there remains an increased pressure of the flushing-blowing agent which took place before the shutdown of the purge. This pressure prevents the ingress of contaminated fluid and sludge from the borehole and annulus, both B bearings of the cones, and into the purge channels 3 in the feet 2, as well as into the cavity 9 of the nipple 1 of the bit, i.e. the bit supports are reliably protected from being slammed by one stop valve - a blowing nozzle 7 held by springs 14 and 15 in a predetermined position, which prevents intense wear of the bearings when drilling resumes and increases the bit durability.

After drilling is completed and the bit is raised to the surface before sinking

5, the wells hook the lower end of the purge nozzle 7 with a hook, put it between the cones 5, raise the nozzle 7 to the highest position and hold it, turn on the purge. In this position window 11

0 are blocked by the inner surface of the sleeve b, which prevents the passage of the flushing-blowing agent into the bottom hole through the central hole of the nozzle 7, and the windows 13 are aligned with the annular

Claims (1)

5 by the chamber 8. Therefore, the flushing and blowing agent from the internal cavity of the drill rod through the purge nozzle 7 and the window 13 enters the cavity 9 of the nipple 1 of the bit, and from it through the channels 3 goes only to the bearings of the hubs 5 and intensively flushes the bearings with an increased mixture pressure , removal of all foreign inclusions from supports. Claims of a roller bit containing nip5 pell, paws attached to the nipple with channels for blowing out supports, fixed to pins with supports, mounted on supports of the pinwheel and the unit of forced washing and lubrication of supports in the form of a sleeve fixed to the nipple and located inside the nozzle sleeve with the possibility of axial movement, characterized in that, in order to increase the durability of the bit by protecting the supports from sludge, the sleeve 5 is made on the inner surface with an annular chamber communicated with the nipple's internal cavity, and the nozzle is made with a solid partition and side windows under the partition and two rows above 0 partition, one of which is located above the chamber, and the other - under the chamber, and the nozzle at both ends is spring-loaded relative to the sleeve located with the possibility of overlapping all the windows of the nozzle when 5 when the bit is in the off position and with the possibility of the camera communicating with the upper row of holes when the nozzle is in the lower position and with the lower one located above the chamber, next to the holes when the upper position is at 0.