SU1002497A1 - Apparatus for combined omechanical drilling and thermal expansion of wells - Google Patents

Description

(54) DEVICE FOR COMBINED MECHANICAL DRILLING AND THERMAL EXPANSION OF WELLS

The invention relates to the mining industry, namely, devices for combined mechanical drilling and thermal expansion of wells, and can be used for passing holes in open pit mining. A device for simultaneous mechanical drilling and thermal expansion of wells is known, in which a combustion chamber with a side nozzle orifice is provided, a housing, mechanical tools with blow holes are rock-blasted, and the process of burning fuel in the annulus of the well is carried out in upward flow. However, in this device the process of burning fuel is not sufficiently effective in the presence of a single lateral nozzle in it. Such an implementation leads to uneven distribution of the flow over the annular section of the well causing a violation of the necessary conditions for cleaning the bottom of the well and pro-; bitches of porous-destroyed mechanical tool, which leads to its premature wear. In addition, conditions are deteriorated for the quality mixing of the fuel with the oxidant in the annulus of the well. Closest to the present invention is a device for mechanical drilling of a well with its thermal expansion simultaneously, comprising a housing, rock-breaking mechanical tools connected to a housing with blowing holes, fuel supply lines for an oxidizer and a combustion chamber that communicates through the side nozzle with the annular well space 2. However, this device is peculiar to all the above disadvantages. The purpose of the invention is to increase the efficiency of the combustion process by uniformly distributing the heat flux over the cross section of the well and increasing the wear resistance of the porous damaging mechanical tool by improving its blowing.

This goal is achieved by the fact that in the device the number of side nozzle holes is equal to the number of rock-breaking mechanical tools with blowing holes, while: the projections of the axes of the nozzle and blowing holes on the horizontal plane coincide.

Fig. 1 shows a device for combined mechanical drilling and thermal expansion of wells; FIG. 2 is a section A-A in FIG. one,

The device comprises a housing 1 with a drill rod 2 and rock-breaking mechanical tools 3 with purge holes 4. Inside the housing 1 there is a combustion chamber 5 with. nozzle openings 6, a fuel injector 7, channels 8 and 9 for supplying air and channel 10 for supplying fuel and a spark plug 11.

The device works in a dim way.

Compressed air from the compressor (shown) is supplied to the drill station 2, where a small part of it through channel 8 enters the combustion chamber 5, and the main part through channel 8 enters the rock blow of a mechanical tool 3, through channel 10 and through the fuel injector 7 , the fuel in atomized form is fed into the combustion chamber 5, where from the ignition plug 11 it ignites and burns with an oxidizer excess ratio well below one. Due to the uniform distribution over the circumference of the chamber 5 of the combustion side lateral nozzles 6, the number of which is equal to the number of rock-breaking mechanical tools 3 with blowing holes 4, an even distribution is provided

high-temperature heat flow over the cross section of the well, which destroys the walls of the well and increases its diameter. In addition, the coincidence of the projections

The axes of the nozzle and purge holes ё and 4, respectively, on the horizontal plane, improve the aerodynamic characteristics of the bit blowing and the removal of the summer slag, and also increase the stability and efficiency of combustion by mixing incomplete combustion fuels with air ascending.

invention formula

A device for combined mechanical drilling and thermal expansion, including a body, rock-breaking mechanical tools connected to the body with purge holes, fuel and oxidizer supply lines, and a combustion chamber that communicates through the side nozzle beyond the well bore, which is caused by , in order to increase the efficiency of the combustion process due to the uniform distribution of the heat flux over the cross section

well and increase the wear resistance of rock cutting mechanical tools by improving its blowing, the number of side nozzle holes equals the number of rock cutting mechanical tools with blowing holes, while the projections of the axes of the nozzle and blowing holes on the horizontal plane coincide.

Sources of information taken into account in the examination

1, USSR Author's Certificate No. 414416, class, E 21 B 7/14, 1974,

2, USSR Author's Certificate Ng 629339, class, E 21 V 7/14, 1978 (prototype).

Claims (1)

15 claims A device for combined mechanical drilling and thermal expansion of wells, including a housing, rock-destroying mechanical tools connected to the housing with purge holes, lines for supplying fuel and oxidizer, and a combustion chamber that is connected through a side nozzle with the annulus of the well, characterized in that, in order to increase the efficiency of the combustion process due to the uniform distribution of the heat flux over the 5Q section of the well and to increase the wear resistance of the rock cutting of a chemical tool by improving its purge, the number of side nozzle holes is equal to the number of rock-breaking mechanical tools with purge 35 holes, while the projections of the axes of the nozzle and purge holes on the horizontal plane coincide.