SU1609938A1 - Bladed drilling bit - Google Patents

Abstract

The invention relates to mining. The goal is to increase bit productivity by reducing the time to bit changeovers and reducing energy costs. For this purpose, the sleeve 7 is installed with the possibility of covering the lower part of the casing 1, made with through radial holes 10 and radial channels 11 located above and below the holes 10 with the possibility of communication with the axial channel 17. In holes 10 there is a lock 9 with fixation sleeve 7 when the working position of the additional blades 5 and its release when the off position of the blades 5 while fixing the piston valve 12 in its working position. The sleeve 7 is made with longitudinal channels arranged with the possibility of communication with the channels 11 and is spring-loaded relative to the housing. When the bit rotates, the torque from the housing 1 to the blade 5 is transmitted through the cup 4, and the axial load through the latch 9. Then turn on the washing and the washing solution flows to the blade m 5 through the axial channel. 2 Il.

Description

The invention relates to mining, and in particular, to drill bits of a blade type for coreless drilling of sk | important.

The purpose of the invention is to increase the performance of the bit by reducing the time for readjustment and reduce energy consumption.

Figure 1 shows the drill bursting - the 10th bit (in the left part of the projection the additional blade is in the working position, on the right side is the same, in the inactive position); figure 2 is a section aa in fig.J. fifteen

The drill bit includes a housing 1 with an axial channel 2 for drilling fluid and a taper thread 3 for connection to a drill string (not shown).

fixed split glass

longitudinal grooves in which rock cutting blades are installed in two tiers, of which additional blades 5 of the lower tier are made 25 with cutters 6 and mounted on the sleeve 7 with the possibility of installation movement relative to the housing 1, and the blades 8 of the upper tier are rigidly fixed in the lower part of the housing . Dose additional blades 5 are equipped with a latch 9 in the form of balls, which are placed in a housing made with radial holes 10 and radial channels 11. 35

In the axial channel 2 of the housing 1, a piston valve 12 with a radial channel 13 is movably mounted with a seat under the Relief ball valve 14 and an external annular groove 15. The piston valve 1 to 2 is spring-loaded 16. The sleeve 7 is made with axial channels 17 and the annular groove 18 under the latch 9. The sleeve Ί is spring loaded relative to the housing 1 by a spring 19 and mounted 45 with the possibility of covering the lower part of the housing 1.

The blade bit works as follows.

Before the descent into the well, the blades 5 of the bit are set to the working position, i.e. the cutting edge is set; below the cutting edge of the fixed blade. 8. To do this, the blades 5 are moved in the direction opposite to the taper thread 3, while compressing the spring 19, until the level of the balls 9 and the annular groove 18 on the sleeve 7 are combined. Piston: valve 12! under influence

About the spring 16 will translate the ball 9 into the annular groove 18, will take its upper position (as shown on the left side of figure 1), thereby fixing the blade 5 in the lower, working position.

.After installing the bit at the bottom, the rotation and axial load are reported to him by the drill string. In this case, the torque from the housing 1 to the blades 5 is transmitted through the cup 4, and the axial load is transmitted through the balls 9. Then the flushing is turned on and the washing solution enters the blades 5 through the axial channel 2.

After a decrease in the rate of well penetration, which indicates wear of the cutters 6 on the blades 5, a ball valve 14 is thrown through the axial channel of the drill string, which, located on the seat of the piston valve 12, overlaps the axial channel 2. Under the action of the pressure of the flushing fluid, the piston valve 12 moves down until the level of balls 9 and the annular groove 15 coincides. In this position, the spring 19 is actuated, moving the balls 9 into the annular groove 15 ', and the sleeve 7 with the blades 5 - in the upper position relative to the housing 1 and above the level of the working edges blades 8 (as shown on the right side of figure 1). In the same position, the channel 17 is combined with the channels 11 in the housing 1 and the channel 13 in the piston valve

12, thus connecting the piston and sub-piston cavities of the axial channel 2. Drilling of the well is continued by the fixed blades 8, the torque and axial load are transmitted from the housing 1 directly to the blades 8, the flushing solution enters the bottom through the channels H, 17 and

13. After working off the blades 8 of its resource, the bit is raised by .po—. surface for restoration of cutting edges of movable and fixed blades.

Claims (1)

Claim Drilling paddle chisel housing with an axial channel, stationary mounted in the lower part of the 'blade housing. a piston valve located in the axial channel of the housing with a seat in the upper part to accommodate the relief ball valve and the outside. an annular groove fixed 1609938 in the lower part of the casing with the possibility of installation movement of the sleeve with an annular groove, additional blades rigidly fixed to the sleeve with a lower end located below the lower end of the stationary blades, and a fixture of additional blades in the form of balls located with the possibility of interaction with the annular groove of the sleeve when the working position of the additional blades and the outer annular groove of the piston valve with its working position, characterized in that, in order to increase To reduce the productivity of the bit by reducing the time for readjustment of the bit and reducing energy consumption, the sleeve is installed with the possibility of covering the lower part of the housing, made with through radial holes and radial channels located above and below the radial holes with the possibility of communication with the channel, and the latch is located in the radial holes casing with the possibility of ^ 0 fixing the sleeve when the additional blades are in working position and unlocking it when the additional blades are inoperative th while simultaneously fixing the piston valve in its 5th working position, and the sleeve is made with longitudinal channels located with the possibility of communication with the radial channels of the housing, and spring-loaded relative to the latter.