Drilling tool for collecting gas deep in underground soil

Abstract

The utility model provides a drilling tool for collecting gas in the deep position of underground soil, the drilling tool comprises a connecting piece, a drilling rod connected with the connecting piece and a drilling bit fixed with the free end of the drilling rod, the connecting piece is used for connecting driving equipment, and the drilling rod is connected with a gas guide device in a hollow sealing mode in the axial direction of the drilling rod. The air guide device comprises a capillary conduit arranged in the hollow part of the drill rod, the capillary conduit is hermetically connected with the drill rod, two ends of the capillary conduit can be connected with an air collection bin and a one-way valve, and an air hole window of the air collection bin is provided with a first filter screen and a second filter screen. According to the drilling tool for collecting the gas deep in the underground soil, gas collection of an underground soil layer is achieved, external gas is prevented from being mixed in, collected gas is prevented from flowing back, the purity of a sample is effectively guaranteed, smoothness of a gas path in the collection process is better guaranteed, and blocking of a filter screen is avoided.

Description

Technical Field

[0001] This utility model relates to the field of geological exploration equipment technology, specifically a drilling tool for collecting gas from deep underground soil. Background Technology

[0002] Soil free gas extraction methods are among the most popular methods in geochemical exploration due to their directness, speed, and minimal interference. CN107153015A describes a drilling tool for collecting gases from soil. The drilling tool includes a drill rod, a capped auger, and a drill bit. The drill rod is connected to a handle. One end of the capped auger is connected to the drill rod, and the other end is connected to the drill bit. A gas extraction tube is provided inside the drill rod and the capped auger, extending axially through them. Inside the drill bit, there is a gas collection chamber connected to the inlet of the gas extraction tube and multiple gas inlet channels connected to the gas collection chamber and extending outward perpendicular to the axial direction of the drill bit. An elastic element is provided at the inlet of each gas inlet channel. This elastic element rotates the drill rod and the capped auger in both directions with the rotation of the handle to close or open the inlet of the gas inlet channel. However, the aforementioned drill bit structure is complex and is mostly used in loose soil. In deep, dense soil, it may be difficult to rotate the drill rod in both directions, which may prevent the air intake channel from opening. When facing soil layers with different hardness, it is difficult to achieve rapid, deep, and effective gas collection. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a drilling tool for collecting gas from deep underground soil, aiming to improve the collection efficiency and purity of gas samples, and applicable to various scenarios such as geological exploration, soil science research and environmental monitoring.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a drill for collecting gas from deep underground soil, the drill comprising a connector, a drill rod connected to the connector, and a drill bit fixed to the free end of the drill rod. The connector is used to connect a drive device. The drill rod is hollow along the axial direction and is sealed to a gas guiding device. The gas guiding device includes a capillary tube built into the hollow part of the drill rod, which is sealed to the drill rod. A gas collecting chamber is also provided inside the free end of the drill rod. One end of the capillary tube extends toward the free end of the drill rod until it is connected to the gas passage of the gas collecting chamber. The other end of the capillary tube extends toward the connection between the drill rod and the connector and extends out of the drill rod near the connector. A gas one-way valve is provided at the end of the capillary tube extending out of the drill rod. The gas flow direction of the gas one-way valve is sequentially from the gas collecting chamber to the capillary tube to the one-way valve.

[0005] The gas collection chamber is provided with a vent window leading to the outside of the drill rod. The vent window is provided with a first filter screen and a second filter screen from the inside to the outside. The mesh size of the first filter screen is smaller than that of the second filter screen.

[0006] The aforementioned drilling tool for collecting gas from deep underground soil consists of a connector, drill rod, capillary gas guiding assembly, gas collection chamber, and drill bit. The drill rod features a hollow design with an internal capillary guide tube to ensure continuous gas transmission. The connector ensures a stable connection between the drill rod and the drive equipment and protects the outlet of the gas guiding assembly. One end of the capillary guide tube is connected to the gas collection chamber via a seal, and the other end is fitted with a one-way valve at the junction of the drill rod and the connector. The one-way valve ensures that gas can only flow from underground towards the gas collection chamber and then out through the one-way valve, preventing the ingress of external gas and backflow of collected gas, effectively ensuring sample purity. The gas collection chamber has a vent window with a first and second filter screen. As gas enters the gas collection chamber at the sampling location, soil particles and other impurities carried in the gas are effectively filtered out, ensuring the purity of the collected gas sample. The first and second filters are designed to be detachable for easy cleaning and replacement. The above-mentioned drilling tool for collecting gas from deep underground soil is used as follows: the one-way valve is closed to shut off the gas path, preventing external gas from mixing in and the collected gas from flowing back during the drilling process. The gas collection chamber set on the drill rod is driven to rotate to the sampling position and gas collection begins. After gas collection, a negative pressure injector is connected, the one-way valve is opened, the negative pressure injector is used to pump out the gas from one or two injectors, and then the process is paused for a period of time to reach equilibrium before gas collection.

[0007] Preferably, the drill rod and the drill bit are detachably connected.

[0008] The drill bits of the aforementioned drilling tools for collecting gas from deep underground soil can be designed and optimized to have different shapes and material specifications, and can be disassembled and replaced to adapt to soil layers with different hardness.

[0009] Preferably, a protective element is provided at the junction of the connector and the drill pipe. The protective element is bowl-shaped, cup-like, cylindrical, or similar to a cylindrical shape, and the gas one-way valve and the end of the capillary tube extending out of the drill pipe are placed inside the protective element.

[0010] Preferably, the end of the capillary tube extending out of the drill rod is also connected to a syringe docking part.

[0011] One end of the capillary tube extends out of the drill rod and connects to the syringe via the syringe docking part. The syringe is used to draw gas from the gas collection chamber.

[0012] Preferably, an airtight component is provided at the connection between the capillary tube and the gas collection chamber, and an airtight component is provided at the connection between the capillary tube and the one-way valve.

[0013] The drilling tools used to collect gas from deep underground soil are equipped with airtight components to ensure that the one-way valve, capillary tube, and gas collection chamber are unobstructed and leak-free.

[0014] Preferably, a sandwich layer is provided on the drill rod body outside the gas collection chamber, and a protective cover is provided in the sandwich layer. The protective cover is located outside the second filter screen and can slide within the sandwich layer. The protective cover is made of stainless steel or alloy sheet.

[0015] The aforementioned drill bit for collecting gas from deep underground soil is equipped with a sandwich protective cover to prevent particles from clogging the filter screen during rotation.

[0016] Preferably, the gas collection chamber is provided with a plurality of arrayed air vents leading to the outside of the drill rod. The protective cover is provided with through holes of the same number as the air vents. The through holes are geometrically similar to the air vent surfaces and are not smaller than the cross-section of the air vents. The positions of the through holes are arranged in the same array as the air vents. The distance between adjacent through holes along the axial direction of the drill rod is greater than the diameter of each through hole. The protective cover is provided with a positioning block, and the drill rod is provided with two positioning grooves that cooperate with the positioning block. When the positioning block is positioned with one of the positioning grooves, the through holes and air vents correspond one-to-one and are in the same position, causing the air vents to open. When the positioning block is positioned with the other positioning groove, the through holes and air vents are misaligned, and the protective cover closes the air vents.

[0017] The aforementioned drilling tool for collecting gas from deep underground soil has a protective cover structure and positioning that effectively prevents particles from clogging the filter screen when the drill rod rotates.

[0018] Preferably, the drill rod is detachably connected to the connector.

[0019] The aforementioned drilling tools for collecting gas deep underground can be configured with different lengths and diameters for the drill rod, increasing their applicability.

[0020] Preferably, the drill rod comprises an integrally cast cylindrical rod and an external helix on the cylindrical rod, the outer diameter of the helix of the drill rod is 30mm~50mm, the cylindrical rod of the drill rod has a hollow portion of 10mm~15mm, and the material of the drill rod is titanium alloy or stainless steel.

[0021] Preferably, the diameter of the capillary is 2-4 mm.

[0022] Preferably, the connector has a suction tube outlet fixing seat inside, and the connector is made of aluminum alloy.

[0023] Preferably, the mesh area of ​​the first filter screen is 0.05 to 0.5 times that of the mesh area of ​​the second filter screen.

[0024] Preferably, the mesh area of ​​the first filter screen is 0.2 to 0.5 times that of the mesh area of ​​the second filter screen.

[0025] The drilling tool for collecting gas from deep underground soil has a first filter screen with a mesh area that is proportional to the second filter screen's mesh area. This ensures good filtration and increases airflow. If the mesh area is too large, impurities will not be filtered out properly; if the mesh area is too small, there is a high risk of filter cake buildup and blockage. The drilling tool for collecting gas from deep underground soil avoids or reduces filter surface deposits, ensuring unobstructed gas flow.

[0026] Preferably, the second filter screen is a metal mesh, and the first filter screen is a microporous membrane.

[0027] Preferably, the gas check valve has a spring-loaded stainless steel diaphragm structure.

[0028] Preferably, the main body of the gas collection chamber is a spiral tube shape similar to that of the drill pipe, and the volume of the gas collection chamber is 3~8mL.

[0029] Preferably, the volume of the gas collection chamber is 5 mL.

[0030] The beneficial effects of this utility model are as follows: This utility model provides a drill for collecting gas from deep underground soil. The drill consists of a connector, a drill rod, a capillary gas guiding assembly, a gas collection chamber, and a drill bit. The drill rod has a hollow design with an internal capillary guide tube to ensure continuous gas transmission. The connector ensures a stable connection between the drill rod and the drive device and protects the outlet of the gas guiding assembly. One end of the capillary guide tube is connected to the gas collection chamber via a seal, and the other end is fitted with a one-way valve at the junction of the drill rod and the connector. The one-way valve ensures that gas can only flow from underground towards the gas collection chamber and then out through the one-way valve, preventing external gas from mixing in and the backflow of collected gas, effectively ensuring the purity of the sample. The gas collection chamber has a vent window with a first and a second filter screen. As the gas enters the gas collection chamber at the sampling location, soil particles and other impurities carried in the gas are effectively filtered out, ensuring the purity of the collected gas sample. The first and second filters are designed to be detachable for easy cleaning and replacement. The drilling tool for collecting gas from deep underground soil is used as follows: The one-way valve is closed to shut off the gas path, preventing external gas from mixing in and the collected gas from flowing back during drilling. The gas collection chamber on the drill rod is rotated to the sampling position to begin gas collection. After gas collection, a negative pressure injector is connected, the one-way valve is opened, and the negative pressure injector expels gas from one or two syringes. After a period of stagnation to reach equilibrium, gas collection begins. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a drill for collecting gas from deep underground soil, according to an embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of the structure of the drill rod near the gas collection chamber of the drilling tool for collecting gas from deep underground soil according to an embodiment of the present invention. (a) is a view of the drill rod near the gas collection chamber along the axial direction, and (b) is a partial schematic diagram of the protective cover inside the interlayer of the drill rod near the gas collection chamber.

[0033] The components include: 1. Gas check valve; 2. Protective component; 3. Connecting component; 4. Drill rod; 5. External helix of drill rod; 6. Airtight assembly; 7. Capillary tube; 8. Airtight assembly; 9. First filter screen and second filter screen; 10. Gas collection chamber; 11. Air vent; 12. Drill rod; 13. Protective cover; 14. Through hole. Detailed Implementation

[0034] To better illustrate the purpose, technical solution, and advantages of this utility model, the following will provide a further description of the utility model in conjunction with specific embodiments. Example

[0035] As an embodiment of this utility model, a drilling tool for collecting gas from deep underground soil includes a connector (3), a drill rod (4) connected to the connector (3), and a drill bit (12) fixed to the free end of the drill rod (4). The connector (3) is used to connect a drive device. The drill rod (4) is hollow along the axial direction and is sealed to a gas guiding device. The gas guiding device includes a capillary tube (7) built into the hollow part of the drill rod. The capillary tube (7) is sealed to the drill rod (4). The inside of the free end of the drill rod (4) also has A gas collection chamber (10) is provided. One end of the capillary tube (7) extends to the free end of the drill rod (4) until it is connected to the gas passage of the gas collection chamber (10). The other end of the capillary tube (7) extends to the connection between the drill rod (4) and the connector (3) and extends out of the drill rod (4) near the connector (3). A gas one-way valve (1) is provided at one end of the capillary tube (7) extending out of the drill rod (4). The gas flow direction of the gas one-way valve (1) is sequentially from the gas collection chamber (10) to the capillary tube (7) to the one-way valve (1).

[0036] The gas collection chamber (10) is provided with a gas window (11) leading to the outside of the drill rod (4). The gas window (11) is provided with a first filter screen and a second filter screen (9) from the inside to the outside. The mesh size of the first filter screen is smaller than that of the second filter screen.

[0037] This embodiment describes a drilling tool for collecting gas from deep underground soil. It consists of a connector, drill rod, capillary gas guiding assembly, gas collection chamber, and drill bit. The drill rod has a hollow design with an internal capillary guide tube to ensure continuous gas transmission. The connector ensures a stable connection between the drill rod and the drive device and protects the outlet of the gas guiding assembly. One end of the capillary guide tube is connected to the gas collection chamber via a seal, and the other end is fitted with a one-way valve at the junction of the drill rod and the connector. The one-way valve ensures that gas can only flow from underground towards the gas collection chamber and then out through the one-way valve, preventing the mixing of external gas and the backflow of collected gas, effectively ensuring the purity of the sample. The gas collection chamber has a vent window with a first and second filter screen. As the gas enters the gas collection chamber at the sampling location, soil particles and other impurities carried in the gas are effectively filtered out, ensuring the purity of the collected gas sample. The first and second filters are designed to be detachable for easy cleaning and replacement. The above-mentioned drilling tool for collecting gas from deep underground soil is used as follows: the one-way valve is closed to shut off the gas path, preventing external gas from mixing in and the collected gas from flowing back during the drilling process. The gas collection chamber set on the drill rod is driven to rotate to the sampling position and gas collection begins. After gas collection, a negative pressure injector is connected, the one-way valve is opened, the negative pressure injector is used to pump out the gas from one or two injectors, and then the process is paused for a period of time to reach equilibrium before gas collection.

[0038] Furthermore, the drill pipe (4) is detachably connected to the drill bit (12).

[0039] In this embodiment, the drill bit of the drilling tool for collecting gas from deep underground soil can be designed and optimized to have different shapes and material specifications, and can be disassembled and replaced to adapt to soil layers with different hardness.

[0040] Furthermore, the capillary tube (7) extends out of the drill rod (4) and is connected to a syringe docking part.

[0041] One end of the capillary tube extends out of the drill rod and connects to the syringe via the syringe docking part. The syringe is used to draw gas from the gas collection chamber.

[0042] Furthermore, a protective element (2) is provided at the junction of the connector (3) and the drill rod (4). The protective element (2) is bowl-shaped, cup-like, cylindrical, or cylindrical. The gas check valve (1) and the capillary tube (7) extend out of the drill rod (4) and are placed inside the protective element (2).

[0043] Furthermore, an airtight component (8) is provided at the connection between the capillary tube (7) and the gas collection chamber (10), and an airtight component (6) is provided at the connection between the capillary tube and the one-way valve.

[0044] In this embodiment, the drilling tool for collecting gas from deep underground soil is equipped with an airtight component to ensure that the one-way valve, capillary tube, and gas collection chamber are unobstructed and leak-free.

[0045] Furthermore, an interlayer (12) is provided on the drill rod (4) outside the gas collection chamber (10), and a protective cover (13) is provided in the interlayer (12). The protective cover (13) is located outside the second filter screen (9). The protective cover (13) can slide in the interlayer. The protective cover (13) is made of stainless steel or alloy sheet.

[0046] In this embodiment, the drill bit for collecting gas from deep underground soil is equipped with a sandwich protective cover to prevent particles from clogging the filter screen during rotation.

[0047] Furthermore, the gas collection chamber (10) is provided with a number of arrayed air vents (11) leading to the outside of the drill rod (4). The protective cover (13) is provided with the same number of through holes (12) as the air vents (11). The through holes (12) are geometrically similar to the air vents (11) and not smaller than the cross-section of the air vents (11). The positions of the through holes (12) are arranged in the same array as the air vents (11). The distance between adjacent through holes (12) along the axial direction of the drill rod (4) is greater than the diameter of each through hole (12). The protective cover (13) is provided with a positioning block. The drill rod (4) is provided with two positioning grooves that cooperate with the positioning block. When the positioning block is positioned with one of the positioning grooves, the through holes (14) correspond one-to-one with the air vents (12) and are in the same position, so that the air vents (12) open. When the positioning block is positioned with the other positioning groove, the through holes (14) and the air vents (12) are misaligned one-to-one, and the protective cover closes the air vents.

[0048] The aforementioned drilling tool for collecting gas from deep underground soil has a protective cover structure and positioning design. When the drill rod rotates, the protective cover can effectively prevent particles from clogging the filter screen. The function of the protective cover is to prevent soil particles from contacting the filter screen during rotation.

[0049] Furthermore, the drill pipe (4) and the connector (3) are detachably connected.

[0050] This embodiment of the drilling tool for collecting gas deep underground can be configured with different lengths and diameters for the drill rod, increasing its applicability.

[0051] Furthermore, the drill rod (4) includes an integrally cast cylindrical rod and an external helix (5) on the cylindrical rod. The outer diameter of the helix (5) of the drill rod is 30mm~50mm. The cylindrical rod of the drill rod (4) has a hollow part of 10mm~15mm. The material of the drill rod (4) is titanium alloy or stainless steel.

[0052] Furthermore, the diameter of the capillary (7) is 2~4 mm.

[0053] Furthermore, the connector (3) is provided with a suction tube outlet fixing seat inside, and the material of the connector (3) is aluminum alloy.

[0054] Furthermore, the mesh area of ​​the first filter screen is 0.05 to 0.5 times that of the mesh area of ​​the second filter screen.

[0055] Furthermore, the mesh area of ​​the first filter screen is 0.2 to 0.5 times that of the mesh area of ​​the second filter screen.

[0056] In this embodiment, the drilling tool for collecting gas from deep underground soil has a first filter screen with a mesh area that is proportional to the mesh area of ​​the second filter screen. This ensures both good filtration and increased airflow. If the mesh area is too large, impurities will not be filtered out cleanly. If the mesh area is too small, there is a high risk of filter cake buildup and blockage. The drilling tool for collecting gas from deep underground soil can avoid or reduce deposits on the filter screen surface and ensure unobstructed gas flow.

[0057] Furthermore, the second filter screen is a metal mesh, and the first filter screen is a microporous membrane.

[0058] Furthermore, the gas check valve has a spring-loaded stainless steel diaphragm structure.

[0059] Furthermore, the main body of the gas collection chamber is a spiral tube shape similar to that of the drill pipe, and the volume of the gas collection chamber is 3~8mL.

[0060] Furthermore, the volume of the gas collection chamber is 5 mL.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A drilling tool for collecting gas from deep underground soil, the drilling tool comprising a connector, a drill rod connected to the connector, and a drill bit fixed to the free end of the drill rod, the connector being used to connect a drive device, characterized in that, The drill rod is hollow along the axial direction and is sealed to a gas guiding device. The gas guiding device includes a capillary tube built into the hollow part of the drill rod. The capillary tube is sealed to the drill rod. A gas collecting chamber is also provided inside the free end of the drill rod. One end of the capillary tube extends towards the free end of the drill rod until it is connected to the gas passage of the gas collecting chamber. The other end of the capillary tube extends towards the connection between the drill rod and the connector and extends out of the drill rod near the connector. A gas one-way valve is provided at the end of the capillary tube extending out of the drill rod. The gas flow direction of the gas one-way valve is sequentially from the gas collecting chamber to the capillary tube to the one-way valve. The gas collection chamber is provided with a vent window leading to the outside of the drill rod. The vent window is provided with a first filter screen and a second filter screen from the inside to the outside. The mesh size of the first filter screen is smaller than that of the second filter screen.

2. The drill tool for collecting gas from deep in the ground according to claim 1, wherein A protective component is provided at the junction of the connector and the drill rod. The protective component is bowl-shaped, cup-like, cylindrical, or cylindrical. The gas one-way valve and the end of the capillary tube extending out of the drill rod are placed inside the protective component. The end of the capillary tube extending out of the drill rod is also connected to a syringe docking part.

3. The drill tool for collecting gas from deep in the ground according to claim 1, wherein An airtight component is provided at the connection between the capillary tube and the gas collection chamber, and an airtight component is provided at the connection between the capillary tube and the one-way valve.

4. The drill tool for collecting gas from deep in the ground according to claim 1, wherein An interlayer is provided on the drill rod body outside the gas collection chamber, and a protective cover is provided in the interlayer. The protective cover is located outside the second filter screen and can slide within the interlayer. The protective cover is made of stainless steel or alloy sheet.

5. The drill tool for collecting gases from deep in the ground according to claim 4, wherein, The gas collection chamber is provided with a plurality of arrayed air vents leading to the outside of the drill rod. The protective cover is provided with through holes of the same number as the air vents. The through holes are geometrically similar to the air vents and are not smaller than the cross-section of the air vents. The positions of the through holes are arranged in the same array as the air vents. The distance between adjacent through holes along the axial direction of the drill rod is greater than the diameter of each through hole. The protective cover is provided with positioning blocks. The drill rod is provided with two positioning grooves that cooperate with the positioning blocks. When the positioning block is positioned with one of the positioning grooves, the through holes and air vents correspond one-to-one and are in the same position, causing the air vents to open. When the positioning block is positioned with the other positioning groove, the through holes and air vents are misaligned, and the protective cover closes the air vents.

6. The drill tool for collecting gases from deep in the earth's soil according to claim 1, wherein, The drill pipe is detachably connected to the connector.

7. The apparatus of claim 1, wherein: The drill rod includes an integrally cast cylindrical rod and an external helix on the cylindrical rod. The outer diameter of the helix of the drill rod is 30mm to 50mm. The cylindrical rod of the drill rod has a hollow portion of 10mm to 15mm. The material of the drill rod is titanium alloy or stainless steel. The diameter of the capillary tube is 2mm to 4mm.

8. The drill tool for collecting gases from deep in the earth's soil of claim 1, wherein, The connector is equipped with a suction tube outlet fixing seat inside, and the connector is made of aluminum alloy.

9. The apparatus of claim 1, wherein, The mesh area of ​​the first filter screen is 0.05 to 0.5 times that of the mesh area of ​​the second filter screen. The second filter screen is a metal mesh, and the first filter screen is a microporous membrane.

10. The drill tool for collecting gases from deep in the ground according to claim 1, wherein, The main body of the gas collection chamber is a spiral tube shape similar to that of the drill pipe, and the volume of the gas collection chamber is 3~8mL.

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