SU1728465A1 - Air hammer for borehole reamer - Google Patents

Abstract

The invention relates to air hammers and m. used in extenders of wells intended to drill drilled wells in rocks of different strengths. The purpose of the invention is to increase the reliability of operation of the pneumatic air distributor when it is installed on the peripheral part of the expander. The pneumatic hammer includes a hollow bush 6 with an annular collar 7, lock rolling bodies 10 and a drill bit with a 1T shank and a head part 13. The head of the axle box 6 is made along the entire length of one diameter. The shank 11 in the area from the head part 13 of the crown to the locking ring 8 has an annular groove, the surface of which is parallel to the surface of the shank 11, and the diameter is equal to the diameter of the cavity of the axle box 6. 1 cf f-crystals, 3 Il.

Description

(L

WITH

The invention relates to pneumatic impactors and can be used in well expanders for drilling holes drilled in rocks of different strengths.

A submersible pneumatic hammer is known, in which in its box it is rigidly fixed by the rolling bodies with the shank of the drilling tool, and the head part projects beyond the end of the axle box (1).

The disadvantage of this hammer is the impossibility of using it in expanders due to the fact that the crowns do not rotate in the bush.

A submersible stump hammer for a spreader is known, in which a rotating ring cage with locking bodies, a locking element for a casing cage and a crown with a shank and a head part fixed in cage rolling 2 are installed in the journal box.

The disadvantage of this hammer is the low reliability during operation due to the radial displacement of the crowns in the bushings of the hammer hammers when drilling.

The purpose of the invention is to improve the reliability of the hammer when installed on the peripheral part of the expander.

This is achieved by the fact that in a pneumatic impactor for an expander of wells, which includes a hollow bush, an annular holder with locking rolling bodies, a locking element for an annular holder and a drill bit with a shank and a head part connected to the annular holder, placed in the journal.

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About SP

a clip of rolling bodies, the cavity of the axle box is made along the entire length of one diameter, and the shank of the drill bit in the section from the head part to the locking ring is provided with an annular groove, the surface of which is parallel to the surface of the axle, and the diameter of the annular groove is not less than the distance from the centers of the swing rolling bodies to the front end of the locking element.

Figure 1 shows the proposed extender, a General view; FIG. 2 is a view along arrow A in FIG. one; in fig. 3 is a section along A-A in FIG. one.

The expander contains several peripheral pneumatic hammers 1, fixed on the collector 2 and fastened together by clips 3, a guide lamp 4 is mounted in the center. The collector 2 is connected to the drill rods 5. In the lower part of the pneumatic hammers 1 there is a bush 6 in which are fixed from falling out ring the holder 7 by the locking element 8 with radial sockets 9, with balls 10. Inside the holder 7, the shank 11 of the crown is fixed using a system of grooves 12, and on the head part 13 of the crown there is an annular groove 14 of length U and diameter D and caps carbide inserts 15. And the front end 16 of the holder 7 is located at a distance L from the center of the balls 10. Inside each of the hammers 1 there is an axially movable piston-hammer 17, which interacts with the end face of the shank 11 of the crown. In the boxes 6 of each pneumatic hammer 1, an annular cavity 18 is made with a diameter D. equal to the diameter of the annular groove 14.

The operation of the proposed extender is carried out as follows. The entire assembled expander is mounted on the rod of the rods 5. Then the lantern 4 is lowered into the forward bore, and the heads of the 13 crowns abut against the rock, turn on the air and apply axial force and torque to the ram. As a result, the piston strippers 17 begin to perform a reciprocating motion and strike blows on the end face of the shanks of 11 crowns, which, under the action of impact energy, insert inserts 15 into the rock and destroy it. Under the action of the torque and axial force, the crowns are moved around the circumference and the entire bottom hole area is completely curved.

The surface of the grooves 14 of the crowns rests in the cavity 18 of the axle 6 and eliminates the radial displacement of the crowns during drilling. The execution of the annular cavity 18 of the axle box 6 and the annular grooves 14 on crowns of the same diameter, and the length L U allows to completely unload the lock rolling bodies from the bending moment, which is perceived by the axle box 6. In addition, the provision of the cavity 18 allows the body

box 6 in its internal cavity to exclude additional concentrators in the form of differential diameters.

Claims (2)

1. Hammer for reamer wells, comprising a hollow bush, an annular housing with locking rolling elements, a locking element for the annular casing and a drill bit with a shank and a head part connected to an annular holder by lock-type rolling bodies, characterized in that, in order to increase the reliability of the pneumatic impactor when it is installed on the peripheral part of the expander, the cavity of the axle box is made along the entire length of one diameter and its shank parts to the locking ring has an annular groove, the surface of which is parallel to the surface of the shank, and the diameter is equal to the diameter of the cavity of the axle box. 2. Air hammer according to claim 1, about t l and h a tout and with the fact that the length of the annular groove is not less than the distance from the centers of the locking bodies to the front end of the ring cage. Vida 1