Well washing and deslagging system

Abstract

The application provides a well washing and residue discharging system, which comprises a residue-liquid separation device and a slurry discharging device. The residue-liquid separation device comprises a vibrating screen and a cyclone in communication. The vibrating screen is provided with a residue inlet, and the cyclone is provided with a slurry discharging port. The height of the slurry discharging port is lower than that of the residue inlet. The slurry discharging device is used for being mounted on the upper end of a drill rod and is in communication with a residue discharging cavity and the residue inlet. The slurry discharging device comprises a fixed pipe in communication with the residue discharging cavity and an adjusting pipe in sealing cooperation with the fixed pipe and in communication with the residue inlet. The total length of the adjusting pipe and the fixed pipe is changed by adjusting the position or length of the adjusting pipe, so that the gas driving device can be matched with drill rods of different heights, the adaptability is high, the operation is simple, the work efficiency is improved, and the system is convenient to popularize.

Description

Technical Field

[0001] This application relates to the field of tunneling technology, and in particular to a well washing and slag removal system. Background Technology

[0002] With the development of the national economy, there is a strong demand for the construction of deep vertical shafts in mining fields such as gold mines, copper mines, iron mines, and phosphate mines. In particular, secondary shaft construction in underground tunnels is limited by the limited construction space. At present, drilling is usually used for construction. Drilling is a relatively safe shaft construction method that "drills without going down into the shaft". Drilling provides power to the surface and uses a drill bit to drill downwards. At the same time, it provides liquid into the shaft. The excavated slag and rocks are carried out into the shaft by the drill bit, drill rod, and slurry pipe under the mud and discharged into the shaft. After sedimentation treatment, it flows back into the shaft. However, the current sedimentation tanks are limited by the site and cannot effectively separate the powdery solids in the slag liquid. Moreover, the area of ​​the sedimentation tank is limited, and the slag liquid cannot flow over long distances to rely on its own weight for the solid particles to settle.

[0003] In view of this, it is necessary to design a well washing and slag removal system to solve one of the above problems. Utility Model Content

[0004] This application provides a well washing and slag removal system, which can effectively improve the effect and efficiency of slag sedimentation.

[0005] To achieve the above objectives, the technical solution provided in this application is as follows:

[0006] This application provides a well cleaning and slag removal system for use with a vertical shaft drilling rig. The vertical shaft drilling rig includes a drill pipe, a gas drive device installed at the upper end of the drill pipe, a drill bit connected to the lower end of the drill pipe, a slag removal chamber extending along the axial direction of the drill pipe, and an air chamber located outside the slag removal chamber. The air chamber is connected to the gas drive device. The well cleaning and slag removal system includes:

[0007] A slag-liquid separation device includes a vibrating screen and a hydrocyclone connected together. The vibrating screen is provided with a slag inlet, and the hydrocyclone is provided with a slurry outlet. The height of the slurry outlet is lower than that of the slag inlet.

[0008] A slurry discharge device is used to install on the upper end of the drill rod and connect the slag discharge chamber and the slag inlet. The slurry discharge device includes a fixed pipe connected to the slag discharge chamber and an adjusting pipe that is sealed to the fixed pipe and connected to the slag inlet. The total length of the adjusting pipe and the fixed pipe can be changed by adjusting the position or length of the adjusting pipe, thereby meeting the needs of the gas drive device to match drill rods of different heights.

[0009] Furthermore, the height of the end of the fixed pipe near the slag discharge chamber is not lower than the height of the end of the regulating pipe away from the fixed pipe.

[0010] Furthermore, the outer diameter of the adjusting tube is smaller than the inner diameter of the fixed tube, and a portion of the structure of the adjusting tube is located inside the fixed tube to change the total length of the adjusting tube and the fixed tube;

[0011] Alternatively, the inner diameter of the adjusting tube is larger than the outer diameter of the fixed tube, and a portion of the structure of the fixed tube is located inside the adjusting tube to change the total length of the adjusting tube and the fixed tube.

[0012] Furthermore, the slurry discharge device also includes a limiting structure for restricting the axial movement of the regulating pipe, the limiting structure including a protrusion on one of the fixed pipe and the regulating pipe, and a groove on the other.

[0013] Furthermore, the slurry discharge device also includes a connecting pipe connecting the cavity of the fixed pipe to the slag discharge cavity. The connecting pipe includes a main pipe communicating with the slag discharge cavity, two first branch pipes respectively connected to the main pipe, and a three-way valve connecting the main pipe and the first branch pipes. There are two fixed pipes, which are respectively connected to the two first branch pipes.

[0014] Furthermore, the slurry discharge device also includes a pair of second branch pipes for connecting to the slag inlet and a rotary connector for connecting the second branch pipes and the regulating pipe.

[0015] Furthermore, the second branch pipe is normally installed alongside the first branch pipe, and the adjusting pipe includes a first section extending in the same direction as the fixed pipe, a second section extending in the same direction as the second branch pipe, and a connecting section connecting the first section and the second section, wherein the connecting section is arranged in an arc.

[0016] Furthermore, the slurry discharge device also includes a sealing element disposed between the regulating pipe and the fixed pipe.

[0017] Furthermore, it also includes a sedimentation tank located below the discharge port, the sedimentation tank including a first sedimentation zone and a second sedimentation zone, the first sedimentation zone being located below the discharge port, and the depth of the second sedimentation zone being greater than the depth of the first sedimentation zone.

[0018] Furthermore, the sedimentation tank also includes a first retaining dam located in the first sedimentation zone and a second retaining dam located in the second sedimentation zone. The first retaining dam is located close to the second sedimentation zone, and the second retaining dam is located in the middle of the second sedimentation zone. The height of the second retaining dam is not lower than the height of the first retaining dam.

[0019] Compared with related technologies, the beneficial effects of this application are as follows: The slurry discharge device of the well washing and slag removal system of this application changes the total length of the regulating pipe and the fixed pipe by adjusting the state or length of the regulating pipe to match the operation process of the gas-driven device at different heights. It has strong adaptability, simple operation, improves work efficiency, and is easy to promote. Moreover, the well washing and slag removal system of this application can realize the treatment method of all slag and liquid first passing through the slag and liquid separation device for filtration, and then passing through the sedimentation tank for sedimentation, which effectively improves the slag filtration effect and efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of different matching states of the fixed pipe and the regulating pipe of the well washing and slag removal system according to one embodiment of the well washing and slag removal system of this application.

[0021] Figure 2 yes Figure 1 A top view of the slag removal system in the well washing process.

[0022] 10-Slag and stone separation system; 11-Vibrating screen; 12-Cyclone separator; 13-Slurry discharge port; 20-Slurry discharge device; 21-Fixed pipe; 22-Regulating pipe; 221-First section; 222-Second section; 223-Connecting section; 23-Connecting pipe; 231-Main pipe; 232-First branch pipe; 233-Three-way valve; 24-Second branch pipe; 25-Rotary connector; 30-Sedimentation tank; 31-First sedimentation zone; 32-Second sedimentation zone; 33-First retaining dam; 34-Second retaining dam; 35-Conveying area Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0024] It should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of simplifying the description of this application and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application. Specifically, in this application, the direction facing the ground is referred to as "lower," and conversely, the direction away from the ground is referred to as "upper." Other descriptions of orientation are defined based on "upper" and "lower."

[0025] In the various figures of this application, for ease of illustration, certain dimensions of structures or parts may be exaggerated relative to other structural parts; therefore, they are only used to illustrate the basic structure of the subject matter of this application.

[0026] This application provides a well washing and slag removal system that works with a vertical shaft drilling rig to separate the slag and slurry excavated by the vertical shaft drilling rig and to return the settled slurry back into the wellbore.

[0027] like Figure 1 As shown, the vertical shaft drilling rig includes a drill rod 100, a gas drive device 200 installed at the upper end of the drill rod 100, a drill bit connected to the lower end of the drill rod 100, a slag discharge chamber 101 extending axially along the drill rod 100, and an air chamber located outside the slag discharge chamber 101. The air chamber is connected to the gas drive device 200. Both the air chamber and the slag discharge chamber 101 extend from top to bottom to the lower part of the cutterhead at the lowest end of the drill bit. The slag discharge chamber 101 at the lower part of the drill bit is provided with air holes, which facilitate the formation of critical conditions for air lift reverse circulation. Two slag suction ports are provided at intervals on the cutterhead and are connected to the slag discharge chamber 101. The two slag suction ports are a central slag suction port and an eccentric slag suction port, which cover the entire excavation face as much as possible. At the same time, three return holes are provided on the side of the cutterhead. The slurry returning to the wellbore flows to the lower part of the cutterhead through the return holes, which prevents the bottom of the cutterhead from being sucked into a vacuum. At the same time, it can also wash the slag around the cutterhead towards the center.

[0028] The gas-driven device 200 is equipped with an air inlet connected to the outlet of the air chamber. High-pressure gas passes through the air inlet and connects to the air chamber between the drill pipe 100 and the drill bit. The gas mixes with the mud in the slag discharge chamber 101, which has air vents. At this time, the density of the liquid forced into the drill pipe 100 is much lower than the density of the liquid inside the wellbore due to the forced air, thus creating a pressure difference between the inside and outside of the drill string and generating liquid convection. When the submersion ratio is greater than 0.5, the mud in the wellbore is discharged through the slag discharge chamber 101. Then, the slag slurry is separated, settled, and returned to the wellbore by the well washing and slag removal system.

[0029] like Figure 1 and Figure 2 As shown, the well washing and slag removal system includes a slag-liquid separation device 10, a slurry discharge device 20 that works with the drill pipe 100, and a sedimentation tank 30. The slurry in the wellbore is transported to the slag-liquid separation device 10 through the slurry discharge device 20 to filter out large pieces of slag. The filtered slurry is then transported to the sedimentation tank 30. Small solid particles or dust are settled in the sedimentation tank 30 and the slurry is then returned to the wellbore to continue participating in the well washing and slag removal process.

[0030] Specifically, the slag-liquid separation device 10 includes a vibrating screen 11 and several hydrocyclones 12 that cooperate with the vibrating screen 11. The vibrating screen 11 is provided with an inlet for receiving slag slurry. The vibrating screen 11 generally adopts a double-sided screen structure, with the upper screen surface adopting an inverted V shape. Combined with the operation of the excitation motor to generate vibration, large pieces of slag are filtered out. The slurry filtered by the upper screen surface is further filtered by the lower screen to remove small pieces of slag, thereby improving the efficiency of slag-liquid filtration.

[0031] The slurry filtered by the vibrating screen 11 enters the hydrocyclone 12. Several hydrocyclones 12 form a hydrocyclone group. Each hydrocyclone 12 is conical in shape. The first section of the hydrocyclone 12 has a large cone angle, which maximizes the tangential velocity of the fluid inside the hydrocyclone 12, increases the centrifugal force field, and separates small particles of slag and stone. The second section has a smaller cone angle and a larger cone length, which allows sufficient time and space for the processed material to be fully exchanged. The third section has a large cone angle, which helps to reduce the amount of fine particles entrained in the underflow of the hydrocyclone 12. The cylindrical section of the hydrocyclone 12 is an effective settling zone that is beneficial to the separation of solid particles, thus improving the separation efficiency.

[0032] In this embodiment, the hydrocyclone 12 is provided with a slurry discharge port 13, the height of which is lower than that of the slag inlet, so as to facilitate the discharge of the separated slurry from the slag-liquid separation device 10.

[0033] The sedimentation tank 30, located below the slurry outlet 13, is used to receive and settle the slurry discharged from the slurry separation device 10. Preferably, the sedimentation tank 30 includes a first sedimentation zone 31 and a second sedimentation zone 32. The first sedimentation zone 31 is located below the slurry outlet 13, and the depth of the second sedimentation zone 32 is greater than the depth of the first sedimentation zone 31. The greater depth of the second sedimentation zone 32 facilitates the sedimentation of small particles and dust, and the sludge settled at the bottom is promptly cleaned, improving sedimentation efficiency. In this embodiment, the slurry settled in the second sedimentation zone 32 is transported into the wellbore by means of a water pump or other means.

[0034] In another specific embodiment, the sedimentation tank 30 further includes a conveying zone 35 connecting the second sedimentation zone 32 and the well shaft. The depth of the second sedimentation zone 32 is greater than the depth of the conveying zone 35, so that the slurry after sedimentation in the second sedimentation zone 32 can enter the well shaft through the conveying zone 35.

[0035] Furthermore, the sedimentation tank 30 also includes a first retaining dam 33 located in the first sedimentation zone 31 and a second retaining dam 34 located in the second sedimentation zone 32. The first retaining dam 33 is located close to the second sedimentation zone 32. The first retaining dam 33 can prevent the slurry from flowing directly into the second sedimentation zone 32, so that the slurry undergoes preliminary sedimentation in the first sedimentation zone 31 and then flows into the second sedimentation zone 32.

[0036] The second retaining dam 34 is located in the middle of the second sedimentation zone 32. The height of the second retaining dam 34 is not lower than the height of the first retaining dam 33. The flowing slurry continues to settle in the second sedimentation zone 32. Moreover, the setting of the second retaining dam 32 can also reduce the impact of mud impact.

[0037] The slurry discharge device 20 is installed on the upper end of the drill rod 100 and connects the slag discharge chamber 101 with the slag inlet. The slurry discharge device 20 includes a fixed pipe 21 connected to the slag discharge chamber 101 and an adjusting pipe 22 that is sealed to the fixed pipe 21 and connected to the slag inlet. The total length of the adjusting pipe 22 and the fixed pipe 21 can be changed by adjusting the position or length of the adjusting pipe 22, thereby meeting the different installation heights of the gas drive device 20. That is, when the installation height of the gas slurry discharge device 20 is changed, the total length of the adjusting pipe 22 and the fixed pipe 21 can be changed by changing the position or state of the adjusting pipe 22 to match the different distances between the gas slurry discharge device 20 and the slag-liquid separation device 10. It is highly adaptable and easy to operate.

[0038] The height of the end of the fixed pipe 21 near the slag discharge chamber 101 is not lower than the height of the end of the regulating pipe 22 away from the fixed pipe 21, so that the entire slurry discharge device 20 from the drill rod 101 to the slag-liquid separation device 10 is inclined downward, which facilitates the transportation of slag slurry.

[0039] In a preferred embodiment of this application, the outer diameter of the adjusting tube 22 is smaller than the inner diameter of the fixed tube 21, and a portion of the structure of the adjusting tube 22 is located inside the fixed tube 21 to change the total length of the adjusting tube 22 and the fixed tube 21. That is, the total length of the adjusting tube 22 and the fixed tube 21 is adjusted by adjusting the length of the adjusting tube 22 extending into the fixed tube 21.

[0040] In a preferred embodiment of this application, the inner diameter of the adjusting tube 22 is larger than the outer diameter of the fixed tube 21, and a portion of the structure of the fixed tube 21 is located inside the adjusting tube 22 to change the total length of the adjusting tube 22 and the fixed tube 21. That is, the total length of the adjusting tube 22 and the fixed tube 21 is adjusted by adjusting the length of the fixed tube 21 contained in the adjusting tube 22.

[0041] In embodiments where the regulating pipe 22 is one of the two types of telescopic pipes described above, the regulating pipe 22 may also be assembled from multiple sub-regulating pipes, which is also within the scope of protection of this application.

[0042] Of course, the regulating pipe 22 can also be a pipe with its own contraction and support functions. As long as the length of the regulating pipe 22 can be changed, it is within the protection scope of this application.

[0043] The slurry discharge device 20 further includes a limiting structure for restricting the axial movement of the regulating pipe 22. The limiting structure includes a protrusion on one of the fixed pipe 21 and the regulating pipe 22, and a groove on the other. In an embodiment where the outer diameter of the regulating pipe 22 is smaller than the inner diameter of the fixed pipe 21, the protrusion is located on the outer wall of the regulating pipe 22, and the groove is located on the inner wall of the fixed pipe 21. In an embodiment where the inner diameter of the regulating pipe 22 is larger than the outer diameter of the fixed pipe 21, the protrusion is located on the outer wall of the fixed pipe 21, and the groove is located on the outer wall of the regulating pipe 22.

[0044] It is understood that the limiting structure comprises several pairs and is spaced apart along the axial direction of the fixed tube 21.

[0045] like Figure 2 As shown, the slurry discharge device 20 also includes a connecting pipe 23 connecting the cavity of the fixed pipe 21 to the slag discharge cavity. The connecting pipe 23 includes a main pipe 231 communicating with the slag discharge cavity, two first branch pipes 232 respectively connected to the main pipe 231, and a three-way valve 233 connecting the main pipe 231 and the first branch pipes 232. The fixed pipe 21 and the regulating pipe 22 are each provided in twos, respectively connected to the two first branch pipes 232. The connecting pipe 23 connects the two sets of fixed pipes 21 and regulating pipes 22 through the three-way valve 233, thereby improving the efficiency of conveying slag slurry.

[0046] Furthermore, the slurry discharge device 20 also includes a pair of second branch pipes 24 for connecting to the slag inlet and a rotating connector 25 for connecting the second branch pipes 24 and the regulating pipe 22. The rotating connector 25 facilitates the rotation of the regulating pipe 22 during the adjustment process, thereby improving the efficiency of operation.

[0047] Furthermore, the second branch pipe 24 is arranged parallel to the first branch pipe 232. The regulating pipe 22 includes a first section 221 extending in the same direction as the fixed pipe 21, a second section 222 extending in the same direction as the second branch pipe 24, and a connecting section 223 connecting the first section 221 and the second section 222. The connecting section 223 is arranged in an arc shape, which makes the conveying process of slag slurry smoother and avoids the situation of jamming at the connecting section 223.

[0048] Furthermore, the slurry discharge device 20 also includes a sealing element disposed between the regulating pipe 22 and the fixed pipe 21 to prevent the slag slurry from leaking from the joint between the regulating pipe 22 and the fixed pipe 21.

[0049] Furthermore, the slurry discharge device 20 also includes a grease injection hole on the regulating pipe 22 or the fixed pipe 21, which facilitates the injection of grease into the overlapping area of ​​the regulating pipe 22 and the fixed pipe 21, thereby improving the smoothness of regulating the regulating pipe 22. If the outer diameter of the regulating pipe 22 is smaller than the inner diameter of the fixed pipe 21, the grease injection hole is located at the end of the fixed pipe 21 near the regulating pipe 22; if the inner diameter of the regulating pipe 22 is larger than the outer diameter of the fixed pipe 21, the grease injection hole is located at the end of the regulating pipe 22 near the fixed pipe 21. That is, the grease injection hole is located on the outer side of the pipe where the regulating pipe 22 and the fixed pipe 21 overlap, which facilitates operation.

[0050] In summary, the slurry discharge device 20 of the well washing and slag removal system of this application changes the total length of the regulating pipe 22 and the fixed pipe 21 by adjusting the state or length of the regulating pipe 22 to match the operation process of the gas drive device 200 at different heights. It has strong adaptability. Moreover, the well washing and slag removal system of this application can realize the treatment method in which all slag and liquid are first filtered by the slag and liquid separation device 10 and then settled in the sedimentation tank 30, which effectively improves the slag filtration effect and efficiency.

[0051] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0052] The detailed descriptions listed above are merely specific illustrations of feasible embodiments of this application and are not intended to limit the scope of protection of this application. All equivalent embodiments or modifications made without departing from the spirit of the art of this application should be included within the scope of protection of this application.

Claims

1. A well cleaning and slag removal system, used in conjunction with a vertical shaft drilling rig, the vertical shaft drilling rig comprising a drill rod, a gas drive device mounted on the upper end of the drill rod, a drill bit connected to the lower end of the drill rod, a slag removal chamber extending axially along the drill rod, and an air chamber located outside the slag removal chamber, the air chamber being connected to the gas drive device, characterized in that, The well washing and slag removal system includes: A slag-liquid separation device includes a vibrating screen and a hydrocyclone connected together. The vibrating screen is provided with a slag inlet, and the hydrocyclone is provided with a slurry outlet. The height of the slurry outlet is lower than that of the slag inlet. A slurry discharge device is used to install on the upper end of the drill rod and connect the slag discharge chamber and the slag inlet. The slurry discharge device includes a fixed pipe connected to the slag discharge chamber and an adjusting pipe that is sealed to the fixed pipe and connected to the slag inlet. The total length of the adjusting pipe and the fixed pipe can be changed by adjusting the position or length of the adjusting pipe, thereby meeting the needs of the gas drive device to match drill rods of different heights.

2. The well washing and slag removal system as described in claim 1, characterized in that, The height of the fixed pipe near the drill rod end shall not be lower than the height of the adjusting pipe away from the fixed pipe end.

3. The well washing and slag removal system as described in claim 1, characterized in that, The outer diameter of the regulating tube is smaller than the inner diameter of the fixed tube, and part of the structure of the regulating tube is located inside the fixed tube to change the total length of the regulating tube and the fixed tube; Alternatively, the inner diameter of the adjusting tube is larger than the outer diameter of the fixed tube, and a portion of the structure of the fixed tube is located inside the adjusting tube to change the total length of the adjusting tube and the fixed tube.

4. The well washing and slag removal system as described in claim 3, characterized in that, The slurry discharge device also includes a limiting structure for restricting the axial movement of the regulating pipe. The limiting structure includes a protrusion on one of the fixed pipe and the regulating pipe, and a groove on the other.

5. The well washing and slag removal system as described in claim 3, characterized in that, The slurry discharge device also includes a connecting pipe connecting the cavity of the fixed pipe to the slag discharge cavity. The connecting pipe includes a main pipe communicating with the slag discharge cavity, two first branch pipes respectively connected to the main pipe, and a three-way valve connecting the main pipe and the first branch pipes. There are two fixed pipes, which are respectively connected to the two first branch pipes.

6. The well washing and slag removal system as described in claim 5, characterized in that, The slurry discharge device also includes a pair of second branch pipes for connecting to the slag inlet and a rotary connector for connecting the second branch pipes and the regulating pipe.

7. The well washing and slag removal system as described in claim 6, characterized in that, The second branch pipe is arranged parallel to the first branch pipe. The adjusting pipe includes a first section extending in the same direction as the fixed pipe, a second section extending in the same direction as the second branch pipe, and a connecting section connecting the first section and the second section. The connecting section is arranged in an arc shape.

8. The well washing and slag removal system as described in claim 3, characterized in that, The slurry discharge device also includes a sealing element disposed between the regulating pipe and the fixed pipe.

9. The well washing and slag removal system according to any one of claims 1 to 8, characterized in that, It also includes a sedimentation tank located below the discharge port, the sedimentation tank including a first sedimentation zone and a second sedimentation zone, the first sedimentation zone being located below the discharge port, and the depth of the second sedimentation zone being greater than the depth of the first sedimentation zone.

10. The well washing and slag removal system as described in claim 9, characterized in that, The sedimentation tank also includes a first retaining dam located in the first sedimentation zone and a second retaining dam located in the second sedimentation zone. The first retaining dam is located close to the second sedimentation zone, and the second retaining dam is located in the middle of the second sedimentation zone. The height of the second retaining dam is not lower than the height of the first retaining dam.

Images