SU1535966A1 - Drilling bit - Google Patents

Abstract

The invention relates to the drilling of wells and is intended for a prodruzhayushchego tool. The goal is to increase the operational efficiency of the bit due to the implementation of a pulsed jetting-ejection scheme for washing the well bottom zone while drilling. The bit includes a body 1 with a cavity 2 and flushing channels 3 and 4 directed respectively to the bottom and into the over-bore space. The chisel has nozzles 5 and 6, a roller cutter 7 and a switching unit for ensuring the periodic switching of the flushing circuit from the jetting to ejection one. The switching unit is made in the form of a rotating coaxially with the chisel of the ring 8, rigidly connected with the driving gear 9, which is located in the heat with the peripheral teeth of one of the cones 7. The lower and upper ends of the ring 8 are made with shaped protrusions 10 and 11, covered with elastic wear-resistant material 12. In the process of drilling, the rotation of the cones 7 is transmitted by means of gear 9 to ring 8, which alternately closes channels 3 and 4 and provides a periodic switching of the jetting washing circuit to the ejection mode. 1 hp f-ly, 3 ill.

Description

Schig.1

to ensure the periodic switching of the flushing circuit from the jetting to ejection one. The switching unit is made in the form of a rotating coaxially with the chisel of the ring 8, rigidly connected with the driving gear 9, which is in engagement with the peripheral teeth of one of the rims 7. The lower and upper ends of the ring 8 are made with shaped projections 10 and 11,

covered with elastic wear-resistant material 12. During the drilling process, the rotation of the cones 7 is transmitted by means of gear 9 to the ring 8, which alternately closes the channels 3 and 4 and provides periodic switching of the jetting washing circuit to the ejection one. 1 h. n. f-ly, 3 ill.

The invention relates to the drilling of wells, in particular to drill bits.

The purpose of the invention is to increase the operational efficiency of the drill bit due to the implementation of a pulsed jetting-ejection scheme for washing the well bottom zone during the drilling process.

Fig 1 shows a drill bit with a switching unit, a longitudinal section; in fig. 2 shows a section A A in FIG. one; in fig. 3 - valve device, general view.

The tricone chisel contains a body 1, in the body of which there is a cavity 2 with flushing channels 3 and 4, directed respectively to the face and in the suprabit space, equipped with cages 5 and 6. roller cutter 7 and in hl and ob. switch, we are flushing with a hydromonium on a to g, we are on-line, made in the form of a rotary knot coaxially with a ring bit K, which is also inserted by means of a shaft.) with a driving neck 9, which is in engagement with the peripheral teeth of at least one and sharoshek 7. The lower and upper ends of the ring 8 are made with shaped protrusions 10 and 11, covered with elastic wear-resistant material 12. The number of projections 10. 11 respectively equal to the number of flushing channels 3, 4.

It works as follows. When drilling in a rotational way, rotation from the roller cutter 7, which meshes with the driving gear 9, is transmitted to the ring 8. At the moment when the pie lugs 10 located at the bottom end of the ring 8, block the inlet flush holes of the channels 3 directed to the zone of destruction of the rock, the drilling fluid enters through the channels 4. equipped with nozzles 6, into the suprabit space. The rotation of the ring 8 provides the overlap of the inlet openings of the flushing channels 4 sector protrusions 11 located on the upper end of the ring 8,

Q, as a result of which the flushing aienT enters through the kana / iui 3 with the jetting nozzles 5 into the destruction of the genus.

Thus, the rotation of the ring 8 provides a periodic alternate turn of the channels 3 and 4 and allows you to implement an i-jet-ejection scheme for washing the bottomhole zone of the well, which contributes to an increase in the performance of the drill bit.

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Claims (2)

Invention Formula five }. A drill bit containing a body, in the body of which there is a cavity with lateral flushing channels directed towards the bottom and into the over-borehole space, nozzles for ejection and 1-sided washing and roller cone, in order to increase the efficiency of the bit by implementing impulse drilling process 0 jetting-ejection scheme of washing the well bottom-hole zone; it is equipped with a unit for periodic switching of flushing from jetting to ejection, made in the form of a rotating coaxially coaxially with the bit of the ring, installed in the internal cavity of the bit, and rigidly connected gear that engages at least one of the cutters, with the lower and upper ends of the ring have shaped protrusions 2. Chisel according to claim 1, characterized in that the shaped protrusions of the ring are reinforced with an elastic wear-resistant material. Fig.Z 12 eight eight