SU1305292A1 - Borehole expander - Google Patents

Abstract

The invention relates to the field of mining, namely to extenders of small diameter wells at the foremost well and may be. used in drilling wells in underground workings. The purpose of the invention is to increase the reliability of the spreader by improving the transport of sludge. In the housing 1 there are fastened impactors 2 with drill bits 3. Between the impact 2, a guide sleeve 4 with a central hole 10 and a spring 6 fixed on it is rigidly connected to the housing 1. The failure 4 has side concave grooves 8 connected to the through hole a longitudinal groove 9 communicated with the hole 10. The hole 10 is made with a tapered widening 11, the larger base of which is directed towards the crowns 3. The sleeve 4 is lowered into the well to the stop. Then compressed air is supplied to the impactors 2 and they strike the crowns 3. The slurry hits the walls of the grooves 8, changes the direction of movement and is transported through the opening 10 to the forward well. The cone-shaped widening 11 contributes to the free sliding of the sludge. The groove 9 allows the crowns 3 to be brought together closely, while at the same time ensuring the rigidity of the holder 4 in the zone of rock failure. 1 3. p. F-crystals, 3 ill. CO JV GcHE with tsD

Description

one

The invention relates to the case, namely to the extender m well. small diameter wagon at the advanced well, and can be used for drilling wells in underground workings.

The purpose of the invention is to increase the reliability of the spreader by improving the transport of sludge.

Figure 1 shows the extender wells, a General view; FIG. 2 is a section A-A in FIG. on fig.Z - view B in figure 2.

Well extender contains cor1305292 2

air and drill bits 3

UDa

0

enters an advanced well. Part of the sludge is captured by the exhaust air flow, and the remaining part is removed from the destruction zone by the crown itself. The slurry hits the walls of the grooves 8, changes the direction of movement, and through the central hole 10 in the guide sleeve 4, the port is ported into the forward borehole.

The cone broadening I1 in the guide case 4 facilitates the free sliding of the sludge into the forward sheath. The presence of a through prnolnopus 1, rigidly connected to one end of the groove 9 between the side grooves 8

1, with impactors 2, in which drill bits 3 are fixed. At the other end of the case 1 there is a guide sleeve 4 with a sharpening 5, in which a spring 6 is fixed abutting the shoulder 7. The guide sleeve 4 has lateral concave grooves 8, the number of which equal to the number of impactors 2 (in this case, two ;. The grooves 8 are connected along their entire length through a longitudinal groove 9, which communicates with the central hole 10 of the guide sleeve 4. The central hole 10 is made with a conical widening 11, drill bits 3,

The expander wells works as follows.

The guide ring 4 1 together with the spring 6 is lowered into the advanced well drilled in advance; to those until the crowns 3 touch the surface of the rock. Compressed air is then supplied to the impactors 2, which strike the drill bits 3. At the same time, a torque is transmitted from the rotator (not shown) to the expander, which causes the impactors 2 to rotate around the longitudinal axis of the housing 1.

1305292 2

air and drill bits 3

UDa

enters an advanced well. Part of the sludge is captured by the exhaust air flow, and the remaining part is removed from the destruction zone by the crown itself. The slurry hits the walls of the grooves 8, changes its direction of movement, and through the central hole 10 in the guide sleeve 4 is transported to the forward well.

The cone broadening I1 in the guide case 4 facilitates the free sliding of the sludge into the forward well. The presence of a through prisolnodit allows to bring the drill bits close together. Friend with a friend while ensuring the rigidity of the guide sleeve 4 in the zone of rock destruction. In addition, the conditions for removing the sludge during the drilling process from the zone of destruction to the advanced well are improved by eliminating the contact of the flow of drill cuttings with the walls of the advanced well.

Claims (1)

1. The well dilator, which includes the impactors fixed in the body. with drill bits, mounted between the strikers and a guide sleeve rigidly connected to the housing with a central hole and a spring fixed on it, characterized in that, in order to increase the reliability of work by improving the transport of cuttings, the guide sleeve is made with lateral concave grooves and connected with them through the longitudinal groove communicated with the Central hole. 2, the Extender according to claim 1, O t, l and -. due to the fact that. the central hole is made with a tapered broadening directed by a large base towards the drill bits. Vid poivern1} then) FIG. 2 FIG. H Editor N.Lazarenko Compiled by L. Cherepenkina Tehred V. Kadar Order 1393/27 Circulation 533Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d.4 / 5 Production and printing company, Uzhgorod, ul. Project, 4 Proofreader S. Shekmar.