SU746114A1 - Apparatus for well-mining of minerals by undeground melting-out - Google Patents

Description

(54) DEVICE FOR BOTTOM EXTRACTION OF USEFUL MINERALS BY THE METHOD OF UNDERGROUND EMISSION

one

The invention relates to the field of mining and can be used for downhole mining by the method of underground smelting of sulfur, as well as viscous oils, bitumens, asphaltites, ozocerite and other minerals, the extraction of which involves their conversion to molten state.

A device is known for underground sulfur smelting using a high-frequency electric field, including a casing installed in a well, located inside said pipe and separated from it by insulators a sulfur lifting pipe, the bottom end of which is provided with an electrode, and the mouth end is connected by an electric cable to a high-frequency energy generator one.

A disadvantage of the known device is that it can only be used if there is a reservoir pressure sufficient to pump molten sulfur self-discharging, and also that it does not provide for heating the sulfur lifting pipe, as a result of which freezing occurs in the well when pumping molten sulfur to the surface and exit Last of all.

A device for downhole mining of minerals by the method of underground mining, smelting, for example, underground smelting of sulfur, using a high-frequency electric field, including a casing installed in a borehole, in which the exhaust and air pipes coaxially separated by insulators, installed

1Q at the downhole end of the evacuation pipe with the possibility of its contact with the reservoir of the mineral, and a high-frequency energy generator connected by means of an electric cable with the evacuation pipe 2.

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Claims (2)

A disadvantage of the known device is that its use does not exclude the possibility of solidification of the molten mineral in the borehole when it is pumped to the surface, since the molten mineral is in contact with the unheated air pipe, and when performing a pumping pipe made of non-ferrous metals, such as aluminum, Insufficiently heated exhaust pipe. The purpose of the present invention is to eliminate this drawback. The goal is achieved by the fact that the device is provided with an electrical contact and a terminal, the electrical contact being configured to form an electrical circuit between the exhaust and air pipes, and the terminal is installed at the wellhead end of the air tube and connected via an electrical cable to the high-frequency power generator. In this case, the electrical contact is rigidly fixed to the downhole end of the air pipe. In addition, the electrical contact is made with the possibility of its movement along the annular space of the pumping and air pipes. FIG. 1 shows a vertical section of a device installed in a well; in fig. 2 - section A-A of FIG. one; in fig. 3 shows a section bb of FIG. 1. The device consists of a casing 1, an evacuation pipe 2 and an air pipe 3 coaxially positioned relative to each other and separated from each other by bushing insulators 4, 5 and 6, an electrode 7 mounted on the downhole end of an evacuation pipe 2 and spring-loaded a spring 8, an electrical contact 9 configured to form an electrical circuit between the evacuation pipe 2 and the air pipe 3, the terminal 10 installed at the wellhead end of the air pipe 3, the high-frequency energy generator 11, the electric cable 12, sleep conjugated switch 13 and connects yushogo generator 11 with the exhaust pipe 2 and the terminal 10. The apparatus is also provided with salnikovsh seal 14 and valve 15 mounted on the conduit surface 16, serving for transport of molten mineral. The insulator 6, which separates the pumping tube 2 from the air tube 3, is extruded with cavities 17, and the electrical contact 9 with cavities 18, which serve for the passage of molten minerals when it is pumped to the surface. The casing pipe 1 is provided with a flange 19 for mounting the device when it is installed in the well 20. The electrode 7 with the spring 8 is designed so that when the device is installed in the well 20, it contacts the mineral layer 21. Pumped pipe 2 is made with perforations at its downhole end. The electrical contact 9 can be rigidly fixed to the back end of the air tube 3 and can be made sliding along said pipe with the possibility of its movement through the annular space of the evacuation pipe. 2 and air pipe 3. The device operates as follows. High-frequency energy from the generator 11 is supplied via an electric cable 12 to the evacuation pipe 2 of one or several devices operating in parallel. The exhaust pipe 2 is supplied with energy to the electrode 7, which radiates the energy of a rapidly varying electromagnetic field into the mineral layer 21, as a result of which it begins to melt. The molten minerals flow down to the bottom of the well 20 and through perforations into the exhaust pipe 2. When compressed air is fed into the air pipe 3 and the valve 15 is opened, the air-lift of the molten mineral through the pump pipe 2 is opened to the surface. To prevent the molten mineral from freezing during its rise through the evacuation pipe 2, the electric power is turned on by means of the switch 13 to terminal 10, through it to the air pipe 3 and through contact 9 to the evacuated pipe 2. For example, the steel air pipe 3 is heated by means of eddy currents and thus prevents the molten mineral from freezing in the evacuation pipe 2. After the pumping out of the molten mineral from the bottom of the borehole 20 has been completed, the switch 13 is turned off, the power supply to terminal 10 is stopped, and the cycle of heating of the mineral formation is repeated. The present invention completely eliminates the possibility of solidification of the molten mineral in the well when it is pumped to the surface, which increases the efficiency of the mining process by the method of underground smelting. Claim 1. Device for downhole mining of minerals by underground smelting, for example, underground mining of sulfur, using a high-frequency electric field, including a casing installed in a well, in which the pumped-out and air pipes are coaxially separated by insulators , an electrode mounted on the downhole end of the evacuation pipe with the possibility of its contact with the reservoir of the mineral, and a high-frequency energy generator connected by means of nical cable with the exhaust pipe, characterized in that in order to avoid possible congealing the molten mineral in the well when pumping to the surface ustrrystvo provided with an electrical contact and the plug, the electrical contact is adapted to form an electrical circuit between the