In-situ leaching process drilling gravel / granule device and method

Abstract

A device and method for drilling and throwing gravel / granules in an in-situ leaching process, the device comprises a tank body, a pressure device, a pressure relief device, a pressure gauge, two discharge ports and a tee; a feeding port is provided on the top of the tank body; the two discharge ports are provided on the tank body, namely an upper discharge port and a lower discharge port, a control valve I is provided in the upper discharge port, and a control valve II is provided in the lower discharge port; the middle head of the tee can be connected to the upper discharge port or the lower discharge port, and is provided with a control valve III, one end of a field is a tee connection port, connected to an external pump, and the other end is a tee discharge port, connected to a gravel / granule throwing pipe; the pressure device, the pressure relief device, and the pressure gauge are all installed on the tank body. The present invention also includes a method for drilling and throwing gravel / granules in an in-situ leaching process. Throwing gravel / granules by using the present invention can effectively solve the problems of stuck gravel / granules and uneven filling of gravel / granules, and the efficiency and quality of throwing gravel / granules are greatly improved, with the characteristics of more energy saving, more efficiency, more convenience, and more safety.

Description

Technical Field

[0001] The invention relates to a device and method for drilling gravel / granule throwing in an in-situ leaching process. Background Art

[0002] In-situ leaching drilling is the only channel for metal mining in in-situ leaching sandstone uranium mines. This channel consists of casing, filter, pellets, and sand settling pipe from top to bottom. It is a working channel for the surface pipeline to form a hydraulic connection with the aquifer, called a production well. During the drilling construction process, it is necessary to fill the annular space between the inner wall of the open hole and the outer wall of the borehole casing with cement slurry for cementing and sealing. In this way, the inside of the uranium mining casing can be completely isolated from the underground water systems. The ore layer can only pass through the pellets and filters and the inside of the casing to maintain hydraulic unobstructed flow, and then return to the surface, thereby achieving the purpose of mining the target layer metal.

[0003] Since 2000, China has been conducting a large number of in-situ leaching sandstone uranium mines, creating and perfecting the gravel-filled drilling structure, which is a forward and reverse gravel (sand and gravel) injection. After continuous improvement, it is still one of the mainstream drilling structures to date. Since 2011, in-situ leaching mines have begun to use replaceable built-in filter drilling structures. First, the bare hole is drilled, and then the casing is installed on the upper part of the ore layer. After reverse grouting, reverse granulation (plastic granules) and the built-in filter are installed in the ore layer position to carry out ore layer segment mining. However, no matter what kind of drilling structure, the gravel / granule injection process is one of the indispensable and important links. It can effectively prevent larger mineral particles and rock debris from entering the filter and causing it to be blocked, thereby ensuring the normal operation of the drilling hole. The most primitive method of throwing gravel / granules is to set up a gravel / granule box and use the gravel / granule weight or liquid drive (no pressure) to throw gravel / granules. This method will cause discontinuous and uneven throwing of gravel / granules, and gaps will appear between the pipe wall and the rock formation (this phenomenon is called bridging). The quality of the gravel / granules cannot be guaranteed, which affects the quality of drilling. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a device and method for drilling gravel / grain casting in an in-situ leaching process which can save time, is easy to operate, ensures continuous gravel / grain casting and guarantees the quality of gravel / grain casting.

[0005] The technical problems to be solved by the present invention are:

[0006] A drilling gravel / granule device for in-situ leaching process comprises a tank body, a pressurizing device, a pressure relief device, a pressure gauge, two discharge ports and a tee; a feed port is provided on the top of the tank body; the two discharge ports are arranged on the tank body, and are an upper discharge port and a lower discharge port respectively, a control valve I is provided in the upper discharge port, and a control valve II is provided in the lower discharge port; the middle head of the tee can be connected to the upper discharge port or the lower discharge port, and is provided with a control valve III, one end of a field is a tee connection port, which is connected to an external pump, and the other end is a tee discharge port, which is connected to a gravel / granule tube; the pressurizing device, the pressure relief device and the pressure gauge are all installed on the tank body.

[0007] Furthermore, the pressurizing device is a pressurizing pipe, which is installed in the middle of the tank body and has a control valve IV. The pressurizing pipe is connected to an external pump and can pass water to pressurize the gravel / particle throwing device.

[0008] Furthermore, the pressure relief device is a pressure relief pipe, which is installed on the upper part of the tank body and has a control valve V.

[0009] Furthermore, the control valve I, control valve II, control valve III, control valve IV and control valve V are all ball valves. Of course, other structural forms of control valves are also possible.

[0010] Further, the connection of the three-way is threaded connection. Of course, other forms of connection can also be adopted.

[0011] The in-situ leaching process drilling gravel / granule method implemented by the device is:

[0012] Positive gravel throwing: connect the tee to the lower discharge port, connect the tee connection port to the pump, connect the tee discharge port to the gravel throwing pipe, connect the pressure device to another pump, close all control valves and ensure that there is no leakage; add the calculated gravel from the feeding port and close the seal; open the pressure device, turn on the pump, open the control valve II and control valve III, observe the pressure gauge and pump conditions, and start throwing gravel; when the pressure on the pressure gauge continues to increase and the prepared granular material has been thrown, it means that the gravel throwing work is completed and there is no gap in the hole for gravel to enter. At this time, close the pump, control valve II, control valve III and pressure device, and open the pressure relief device to release the pressure; after the pressure is balanced, disassemble the pipeline, open the control valve II, and discharge the remaining material in the tank;

[0013] Reverse pelletizing: connect the tee to the upper discharge port, connect the tee connection port to the pump, connect the tee discharge port to the pelletizing pipe, ensure that the height of the tee discharge port is higher than the tee connection port, connect the pressure device to another pump, close all control valves, and ensure that there is no leakage; add the calculated pellets from the feeding port and close the seal. At this time, the density of the pellets is lighter than water and floats on the water surface; open the pressure device, turn on the pump, open control valve I and control valve III, observe the pressure gauge and pump conditions, and start pelletizing; when the pressure on the pressure gauge continues to increase and the prepared pellets are put in, it means that the pelletizing work is completed and there is no gap in the hole for pellets to enter. At this time, close the pump, control valve I, control valve III and the pressure device, and open the pressure relief device to relieve pressure; after the pressure is balanced, disassemble the pipeline, open control valve II, and discharge the remaining material in the tank.

[0014] Technical principle:

[0015] After all pipelines are connected and tested for airtightness, all control valves are closed in the initial state, gravel / granular materials are added through the feeding port, and the feeding port is closed. At this time, the tank is in a static state; the pressure device, the discharge port control valve equipped with a three-way valve and the three-way control valve are turned on, and the pressure device injects water into the tank body through a pump to increase pressure, and the pump of the three-way connection port also pressurizes water. According to the pressure balance, the gravel / granular materials enter the gravel / granular feeding pipe from the three-way discharge port, and gravel / granular feeding begins. The pressure in the tank is monitored by a pressure gauge and adjusted by a pressure relief valve;

[0016] When throwing gravel forward, the tee is connected to the lower part of the tank, and the gravel enters the gravel-throwing pipe by the gravel's own weight and water flow; when throwing gravel backward, the tee is connected to the upper part of the tank, and the discharge port is ensured to be at a high position. At this time, the gravel is lighter than water and floats on the water surface. Under the action of pressure and water flow, it enters the tee discharge port;

[0017] Before adding gravel / granules, make preparations for adding gravel / granules and prepare the calculated amount of gravel / granules; when the gravel / granules are used up, the pressure in the tank increases significantly and continues to rise, indicating that the gravel / granules are added. Close all control valves, open the pressure relief device to release the pressure, remove the pipeline after the pressure is balanced, open the lower discharge port control valve, and discharge the remaining material in the tank.

[0018] Beneficial effects of the present invention:

[0019] The previous method of throwing gravel / granules had a long time of use, low efficiency, easy blockage of pipes by gravel / granules, uneven filling of gravel / granules, and required operation by experienced technicians, which seriously affected the quality of throwing gravel / granules;

[0020] By utilizing the present invention to throw gravel / granules, the entire device is sealed and externally pressurized, which can effectively solve the main problems of gravel / granule sticking and uneven filling of gravel / granules, and the efficiency and quality of throwing gravel / granules are greatly improved, with the characteristics of more energy saving, higher efficiency, more convenience, and greater safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0022] In the figure: 1. feeding port, 2. three-way discharge port, 3. three-way connecting port, 4. three-way ball valve, 5. three-way, 6. upper discharge port ball valve, 7. upper discharge port, 8. pressurizing pipe, 9. pressurizing pipe ball valve, 10. lower discharge port, 11. lower discharge port ball valve, 12. supporting legs, 13. tank body, 14. pressure gauge, 15. pressure relief pipe, 16. pressure relief pipe ball valve. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments. Example

[0024] Reference Figure 1 , a drilling gravel / granule throwing device for in-situ leaching process, comprising a tank body 13, a pressurizing device, a pressure relief device, a pressure gauge 14, two discharge ports and a tee 5; the tank body 13 is provided with three legs 12, and a feeding port 1 is provided on the top; the two discharge ports are arranged on the tank body 13, respectively, an upper discharge port 7 and a lower discharge port 10, the upper discharge port 7 is provided with an upper discharge port ball valve 6, and the lower discharge port 10 is provided with a lower discharge port ball valve 11; the middle head of the tee 5 can be connected to the upper discharge port 7 or the lower discharge port 10, and is provided with a three-way ball valve 4, one end of a field is a three-way connecting port 3, which is connected to an external pump, and the other end is a three-way discharge port 2, which is connected to a gravel / granule throwing pipe; the pressurizing device, the pressure relief device, and the pressure gauge 14 are all installed on the tank body 13.

[0025] In this embodiment, the pressurizing device is a pressurizing pipe 8, which is installed in the middle of the tank body 13 and has a pressurizing pipe ball valve 9. The pressurizing pipe 8 is connected to an external pump and can pass water to pressurize the gravel / particle throwing device.

[0026] In this embodiment, the pressure relief device is a pressure relief pipe 15, which is installed on the upper part of the tank body 13 and has a pressure relief pipe ball valve 16. The pressure in the tank can be monitored by the pressure gauge 14. When the pressure is greater than the rated pressure, the pressure relief pipe ball valve 16 is opened to release the pressure and control the pressure in the tank.

[0027] In this embodiment, the connection of the tee 5 is threaded connection. Of course, other forms of connection can also be adopted.

[0028] In this embodiment, the tank body is 1600mm high and 1200mm in diameter; the gravel / granule opening is 100mm high and 400mm in diameter; the tee 5 is a 50mm iron pipe; the pressure pipe 8 in the tank has a horizontal length of 850mm and a vertical height of 1000mm, and is oblique to prevent blockage; the pressure relief pipe 15 is 150mm long and 30mm in diameter, and the pressure gauge 14 connecting pipe is 275mm long; the leg 12 is 1000mm long and 20mm wide; the discharge port is a 50 iron pipe with a length of 250mm, and all the connecting ports are threaded connections, which are the same model as the gravel / granule pipe and the pump connecting pipe.

[0029] The in-situ leaching process drilling gravel / granule method implemented by the device is:

[0030] Positive gravel throwing: connect the tee 5 to the lower discharge port 10, connect the tee connection port 3 to the pump, connect the tee discharge port 2 to the gravel throwing pipe, connect the pressure pipe 8 to another pump, close all ball valves and ensure that there is no leakage; add the calculated gravel from the feeding port 1 and close the seal; open the pressure pipe ball valve 9 of the pressure pipe 8, turn on the pump, open the lower discharge port ball valve 11 and the three-way ball valve 4, observe the pressure gauge 14 and the pump, and start throwing gravel; when the pressure gauge pressure continues to increase and the prepared granular material has been thrown, it means that the gravel throwing work is completed, and there is no gap in the hole for gravel to enter. At this time, close the pump, the lower discharge port ball valve 11, the three-way ball valve 4 and the pressure pipe ball valve 9, and open the pressure relief pipe ball valve 16 to release the pressure; after the pressure is balanced, disassemble the pipeline, open the lower discharge port ball valve 11, and discharge the remaining material in the tank;

[0031] Reverse pelletizing: connect the tee 5 to the upper discharge port 7, connect the tee connection port 3 to the pump, connect the tee discharge port 2 to the pelletizing pipe, ensure that the height of the tee discharge port 2 is higher than the tee connection port 3, connect the pressure pipe 8 to another pump, close all ball valves, and ensure that there is no leakage; add the calculated pellets from the feeding port 1 and close the seal. At this time, the density of the pellets is lighter than water and floats on the water surface; open the pressure pipe ball valve 9 of the pressure pipe 8, turn on the pump, open the upper discharge port ball valve 6 and the three-way ball valve 4, observe the pressure gauge 14 and the pump, and start pelletizing; when the pressure gauge pressure continues to increase and the prepared pellets are put in, it means that the pelletizing work is completed and there is no gap in the hole for pellets to enter. At this time, close the pump, the upper discharge port ball valve 6, the three-way ball valve 4 and the pressure pipe ball valve 9, and open the pressure relief pipe ball valve 16 to relieve pressure; after the pressure is balanced, disassemble the pipeline, open the lower discharge port ball valve 11, and discharge the remaining material in the tank.

Claims

1. In-situ leaching process drilling gravel / granule device, characterized by: It comprises a tank body, a pressurizing device, a pressure relief device, a pressure gauge, two discharge ports and a tee; a feed port is arranged on the top of the tank body; the two discharge ports are arranged on the tank body, namely an upper discharge port and a lower discharge port, the upper discharge port is provided with a control valve I, and the lower discharge port is provided with a control valve II; the middle head of the tee can be connected with the upper discharge port or the lower discharge port, and is provided with a control valve III, one end of a field is a tee connection port connected with an external pump, and the other end is a tee discharge port connected with a gravel / granule feeding pipe; the pressurizing device, the pressure relief device and the pressure gauge are all installed on the tank body; the pressurizing device is a pressure pipe, which is installed in the middle of the tank body and is provided with a control valve IV, the pressurizing pipe is connected with an external pump, and can pass water to pressurize the gravel / granule feeding device; the pressure relief device is a pressure relief pipe, which is installed on the upper part of the tank body and is provided with a control valve V; the pressure gauge is installed on the upper part of the tank body.

2. The in-situ leaching process drilling gravel / granule device according to claim 1, characterized in that: The control valve I, control valve II, control valve III, control valve IV and control valve V are all ball valves.

3. The in-situ leaching process drilling gravel / granule device according to claim 1 or 2, characterized in that: The connections of the tees are all threaded connections.

4. A method for drilling gravel / granule in-situ leaching process using the device of claim 1, characterized in that: Positive gravel throwing: connect the tee to the lower discharge port, connect the tee connection port to the pump, connect the tee discharge port to the gravel throwing pipe, connect the pressure device to another pump, close all control valves and ensure that there is no leakage; add the calculated gravel from the feeding port and close the seal; open the pressure device, turn on the pump, open the control valve II and control valve III, observe the pressure gauge and pump conditions, and start throwing gravel; when the pressure on the pressure gauge continues to increase and the prepared granular material has been thrown, it means that the gravel throwing work is completed and there is no gap in the hole for gravel to enter. At this time, close the pump, control valve II, control valve III and pressure device, and open the pressure relief device to release the pressure; after the pressure is balanced, disassemble the pipeline, open the control valve II, and discharge the remaining material in the tank; Reverse pelletizing: connect the tee to the upper discharge port, connect the tee connection port to the pump, connect the tee discharge port to the pelletizing pipe, ensure that the height of the tee discharge port is higher than the tee connection port, connect the pressure device to another pump, close all control valves, and ensure that there is no leakage; add the calculated pellets from the feeding port and close the seal. At this time, the density of the pellets is lighter than water and floats on the water surface; open the pressure device, turn on the pump, open control valve I and control valve III, observe the pressure gauge and pump conditions, and start pelletizing; when the pressure on the pressure gauge continues to increase and the prepared pellets are put in, it means that the pelletizing work is completed and there is no gap in the hole for pellets to enter. At this time, close the pump, control valve I, control valve III and the pressure device, and open the pressure relief device to relieve pressure; after the pressure is balanced, disassemble the pipeline, open control valve II, and discharge the remaining material in the tank.

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