SU1222811A1 - Diamond stepped-tooth bit - Google Patents

Description

one

122281

The invention relates to rock cutting tools, reinforced with natural, synthetic diamonds and diamond-hard alloy plates for drilling with projectiles with removable core receiver in relatively soft rocks.

The aim of the invention is to increase the efficiency of the diamond crown by improving the cleaning of the sludge bottom.

FIG. 1 shows a crown, a longitudinal section; in fig. 2 is a view A of FIG. one.

The crown consists of a housing 1 and a diamond-containing matrix 2, separated by end 3 and inner 4 and outer 5 side flushing channels into gear-stepped sectors 6. At the same time, the cross-sectional area of the internal side flushing channels 4 is 0.23-0.33 square transversely 1 ;; for sections of external lateral flushing channels 5. Channels 5 are connected with the external annular groove 7 of housing 1, which has a depth, h relative to the surface of the crusts, with the largest diameter not less than the depth of us external lateral flushing channels 5 and across Noe section at odds IU rectangular trapezium acute Hugo which faces away from the working end of the crown. The mating areas of the inner side channels 4 with the end channels 3 are made rounded (radius r,), also made rounded (radius r,) mating areas of the outer

0

five

0

0

five

five

12

side channels 5 with end channels 3.

Almaz crown works as follows.

When crown-drilled, its diamond-containing gear-stepped sectors 6 impact the bottom rock and effectively destroy it with the formation of a large amount of sludge that is picked up by the flow of flushing fluid (flooded turbulent jets) entering the bottomhole through the internal side flushing channels 4, and is carried through the end channels 3, the outer side washing channels 5, communicating with the annular groove 7, in the annular gap between the crown body and the walls of the well.

Moreover, due to the fact that the cross-sectional area of the internal side washing channels of the crown is 0.23-0.33 of the cross-sectional area of the external side washing channels, favorable conditions are created in the direction of the washing liquid for expanding the submerged jets in transverse dimensions, which is positive Influences the removal of sludge from the bottom. Due to the smooth turns of the flushing fluid in the rounded sections, the inner 4 and outer 5 side flushing channels of the crown with the end channels 3, as well as the annular grooves 7, decrease hydraulic losses, which also improves the conditions for cleaning the well from fractured rock (sludge).

vniipi

Circulation 548

Order 1682/31 Subscription

(put.Z

Branch PPP Patent,

Uzhgorod, st. Project, 4

Claims (2)

1. DIAMOND GEAR-STAGE CROWN, comprising a body and a diamond-containing matrix, divided by end and internal and external side flushing channels into sectors, characterized in that, in order to increase work efficiency by improving the cleaning of the bottom of the sludge, the body is made with an outer ring groove communicating with external lateral flushing channels and having a cross section in the form of a rectangular trapezoid, the acute angle of which is facing from the working end of the crown, and the depth relative to the surface of the crown ki of the greatest diameter of at least the depth of the outer side flushing channel, wherein the cross section of the inner side flushing channel area of 0,230,33 cross sectional area of the outer side flushing channel. 2. The crown according to claim 1, characterized in that the mating portions of the inner and outer side flushing channels with the end flushing channels are rounded. FIG. 1 SU .... 1222811>