SU1657596A1 - Diamond crown bit - Google Patents

Abstract

The invention relates to a rock-breaking tool and improves the efficiency of the crown by improving the cleaning of the sludge bottom and more intensive heat removal from the matrix. The crown includes a housing 1 with a matrix 2, divided by flushing grooves 3 into sectors 4. On the outer and inner surfaces of the matrix 2 and the housing 1 there are screw channels 5 with a step of 0.16-0, 25 circumferential lengths directed from the end grooves along the core-forming surface in the direction of rotation of the crown, and on the well-forming - opposite. Screw channels 5 are led out to annular grooves 6 made along the outer and inner surfaces of the housing from the side of the connecting thread 7. The cross-section of the channels has the shape of a trapezoid whose working faces are reinforced with wear-resistant material, and the radius of the housing 1 and the die 2 through the screw channels 5 corresponds to corresponding to the radius of the annular groove 6. This embodiment of the flushing system eliminates the hydraulic losses in the annular gaps between the crown and the core with the borehole walls due to the floor tim gaps in said vortex pump effect. 2 hp ff, 2 ill. and СЛ ч4 СЛ Ч) О Fig.)

Description

The invention relates to a rock demolishing tool, namely, diamond drill bits.

The purpose of the invention is to increase the efficiency of the crown by improving the cleaning of the bottom from the sludge, reducing the hydraulic resistance and intensifying the heat removal from the die.

Figure 1 shows a crown, a general view with a partial explosion, - in figure 2 - the same, view from the side of the working end.

The crown has a housing 1 and a diamond-containing matrix 2, divided by flushing face grooves 3 into sectors 4. On the inner and outer surfaces of the housing 1 and die 2, screw channels 5 connected to the grooves 3 are made with a step of 0.16-0.25 of the circumference and directed from the end grooves 3 along the core-forming surface in the direction of rotation of the crown, and along the well-forming surface in the opposite direction. Screw channels 5 are led to annular grooves 6 made on the outer and inner surface of the housing 1 from the side of the connecting thread 7. The cross section of the channels 5 has the shape of a trapezoid, the large bases of which face the open surfaces, and the working faces 8 of the trapezoid are reinforced with a wear-resistant material, for example hiboride titanium. The annular grooves 6 on the inner and outer surfaces of the housing 1 are made with a radius corresponding to the radius of the housing 1 and the die 2 along the bottom of the screw channels 5, and correspond to the inner and outer diameters of the core tube.

In a wellbore, its natural walls and core, forming small annular joints with a body and a crown matrix, serve as elements of stationary cylinders, and a drill crown with multiple side screw trapezoid flushing channels - a double-sided rotor of a vortex pump.

Burov crown works as follows.

8, during the drilling of the drill, the cleaning agent under the action of the mud pump follows a direct washing pattern through the constrained annular gap between the core and the crown body 1, where, in addition to axial movement, a large part of the liquid is supplied by centrifugal forces through the internal lateral screw multi-outlet flushing channels 5 through end flush grooves 3 to flush screw trapezoidal multiple feed channels 5 on the well-forming surface of the crown. The transfer of energy from screw multishopping trapezoidal flushing channels to the flushing fluid and its transfer from the internal cavity to the outer one in narrow annular gaps occurs as a result of pressure and friction generated by the action of the development of a vortex centrifugal force. The smaller the gap between the crown casing and the core, the casing and the walls of the well, and the greater the number of revolutions of the crown, the more effective the pumping of flushing fluid and heat removal from the crown. Thus, in small annular gaps in a drilling well

diamond drill bit with multiple screw trapezoidal flushing channels creates the effect of a vortex pump and eliminates those hydraulic resistances that have

place when drilling with known diamond crowns, since the washing fluid is additionally pumped directly by the proposed crown from the inner cavity to the outer one and then to the

the annular space of the well, which reduces the hydraulic power to pump the well. In addition, the reduction of hydraulic resistances in the constrained annular gaps during drilling reduces

pressure in the core tube at the core reduces the complication caused by self-sticking of the core, increasing its output and speed of drilling.

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Claims (3)

1. A diamond bit crown, comprising a housing with a connecting thread and a die, divided into sectors by end grooves and side screw channels directed from the end grooves along the core-forming surface in the direction of rotation, and along the well-forming surface in the opposite direction, characterized in that, in order to increase its efficiency by improving the cleaning of the slag from the sludge, reducing the hydraulic resistances and intensifying the heat removal from the matrix, the housing from the side of the connecting thread on the inner and outer surfaces is made with annular grooves, and the lateral vortex channels ya of the inner and outer surfaces are connected to the corresponding annular grooves, wherein the pitch of the screw channels is 0.16-0.25 of the circumference of the die. 2. The crown according to claim 1, characterized in that the diameter of the annular grooves on the inner and outer surfaces of the body are equal, respectively inner and outer diameters of the housing along the bottom of the side channels. 3. The crown according to claim 1 and 2, characterized in that the lateral helical channels have a trapezoid shape in cross section, the working faces of which are reinforced with a wear-resistant material. FIG. 2