A natural hydrogen detection device and detection method

Abstract

The application discloses a natural hydrogen detection device and a detection method. The natural hydrogen detection device comprises a pipeline assembly, a gas bag and a host. The pipeline assembly comprises a first pipeline and a second pipeline. The gas bag is connected with the second pipeline, and the first pipeline passes through the gas bag. The host is internally provided with a pump group and a sample container. A negative pressure port of the pump group is connected with an exhaust port of the sample container through a multi-channel valve, and a positive pressure port of the pump group is connected with an air inlet of the sample container through the multi-channel valve. One port of the multi-channel valve is always open as the exhaust port. After the gas bag seals a detection well, a detection channel is formed through the first pipeline, the pump group and the sample container. The well bottom gas isolated from external air is extracted into the sample container for detection through the detection channel. At the same time of detection, a negative pressure is formed to guide the well bottom gas, so that the well bottom gas is extracted into the sample container for quantitative detection for many times in a short time, and a large amount of reliable data is provided for hydrogen gas reservoir analysis.

Description

Technical Field

[0001] This invention relates to the field of gas reservoir detection technology, specifically to a natural hydrogen detection device and detection method. Background Technology

[0002] Natural hydrogen is an energy source found underground. Compared to chemical methods of hydrogen production, mining natural hydrogen can effectively reduce carbon emissions during the extraction process. However, natural hydrogen mining requires preliminary exploration of the planned area for a certain period of time to obtain more data and improve the success rate of extraction.

[0003] Currently, natural hydrogen detection typically employs a natural spillway method. This involves sealing a portion of the ground in a designated area with a container to prevent gas leakage and create an internal / external isolation. A well is drilled in the ground within the detection area, and a filter is placed there. The filter is connected via pipes to a gas monitoring device located outside the sealed container, allowing the hydrogen escaping from the ground to flow through the pipeline to the monitoring device to obtain data. While this method of isolating external air and guiding freely escaping hydrogen to the monitoring device can provide data for analyzing underground hydrogen reservoirs, the rate of hydrogen spillway is usually slow due to the resistance of geological fissures. This means that the monitoring device typically requires a considerable amount of time to obtain a small amount of gas for detection. Furthermore, as the amount of hydrogen spilled from the sealed container increases, the internal pressure increases, further affecting the spillway rate and thus impacting the detection efficiency of hydrogen reservoirs.

[0004] Therefore, existing detection devices that isolate external air and guide the free-floating hydrogen to be directionally transported to gas monitoring equipment to obtain data are inefficient in detecting hydrogen reservoirs because the passive guidance method after isolating external air makes it difficult to increase the diffusion rate of underground hydrogen. Summary of the Invention

[0005] The purpose of this invention is to provide a natural hydrogen detection device and detection method to solve the technical problem in the prior art that it is difficult to increase the escape rate of underground hydrogen by using passive guidance after isolating external air, thus affecting the detection efficiency of hydrogen reservoirs.

[0006] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0007] A natural hydrogen detection device, comprising:

[0008] A pipeline assembly suspended in a pre-dug exploration well, the pipeline assembly comprising a first pipeline and a second pipeline;

[0009] An airbag is disposed on the tubing assembly, the airbag is connected to the second tubing, and the first tubing passes through the airbag;

[0010] The main unit is located outside the detection well. The main unit contains a pump set and a sample container. The negative pressure port of the pump set is connected to the first pipeline and the exhaust port of the sample container through a multi-channel valve. The positive pressure port of the pump set is connected to the second pipeline and the air inlet of the sample container through a multi-channel valve. One of the ports of the multi-channel valve is normally open as an exhaust port.

[0011] The pump unit can inflate the airbag through the second pipeline to expand and press against the well wall, sealing and isolating the well bottom environment from the external environment. After isolation, the pump unit can discharge the well bottom air through the first pipeline and form a negative pressure to increase the underground hydrogen permeation and diffusion rate by utilizing the pressure difference.

[0012] The sample container is equipped with a sensor for detecting hydrogen content. The pump unit can deliver bottom gas to the sample container through the first pipeline for quantitative detection and create a negative pressure environment at the bottom of the well while delivering the bottom gas, thereby achieving negative pressure guidance of the bottom gas.

[0013] Furthermore, the host computer is capable of recording the hydrogen content value of each quantitative detection of the sample container.

[0014] As a preferred embodiment of the present invention, the airbag includes a core cylinder, an annular bladder body is provided on the outer peripheral wall of the core cylinder, and the two ends of the core cylinder are sealed by end caps.

[0015] A through hole is provided on the end cap, the pipeline assembly passes through the through hole through the end cap, and the gap between the through hole and the pipeline assembly is sealed by a sealing ring. Inside the core cylinder, there is an air nozzle that communicates with the annular bladder. The second pipeline is connected to the air nozzle of the annular bladder inside the core cylinder.

[0016] As a preferred embodiment of the present invention, two airbags are provided on the pipeline assembly, one of the airbags being located in the lower part of the pipeline assembly and placed in the bottom area of ​​the well, and the other airbag being located in the upper part of the pipeline assembly and placed in the wellhead area, so as to perform secondary sealing in the exploration well, forming an exploration area below the lower airbag and an isolation area between the two airbags.

[0017] Furthermore, the air nozzles of both annular bladders are connected to the second pipeline, and the first pipeline passes through the two core cylinders sequentially along the through hole.

[0018] As a preferred embodiment of the present invention, the pipeline assembly further includes a third pipeline, wherein the negative pressure port of the pump unit is connected to the first pipeline, the exhaust port of the sample container and the upper end of the third pipeline respectively through a multi-channel valve, and the lower end of the third pipeline is located between the two airbags to form a negative pressure in the isolation area.

[0019] As a preferred embodiment of the present invention, a plurality of elastic rings are provided on the outer peripheral wall of the annular bladder. The plurality of elastic rings are equidistant along the axial direction, and the elastic rings can be deformed under pressure to fit the well wall, so as to form a multi-layer seal between the annular bladder and the well wall.

[0020] As a preferred embodiment of the present invention, the first pipe is composed of multiple first pipe sections connected in sequence, and a first socket joint and a first plug joint are respectively provided at both ends of the first pipe section. Adjacent two first pipe sections are connected by the first socket joint and the first plug joint.

[0021] The second pipe is composed of multiple second pipe sections connected in sequence. A second socket and a second plug are respectively provided at both ends of the second pipe section. Adjacent second pipe sections are connected by the second socket and the second plug.

[0022] As a preferred embodiment of the present invention, the lengths of the plurality of first tube sections are equal or unequal, and the two ends of the first tube sections inside the core tube pass through the through holes on the two end caps respectively, and the first connector and the first plug connector are connected to the first tube sections outside the core tube.

[0023] As a preferred embodiment of the present invention, the lengths of the plurality of second tube sections are equal or unequal;

[0024] The two ends of the second section tube inside the upper core tube pass through the through holes on the two end caps, and the second connector and the second plug are connected to the second section tube outside the core tube.

[0025] The upper end of the second section tube inside the lower core tube passes through the through hole on the end cap, and its lower end is closed inside the core tube. The second connector or the second plug connector is connected to the second section tube outside the core tube.

[0026] Furthermore, a connector is provided in the middle of the second section of the core tube in both the upper and lower layers, and the connector of the second section of the core tube is connected to the air nozzle of the annular bladder inside the core tube.

[0027] In a preferred embodiment of the present invention, a cone is installed at the lower end of the pipeline assembly, and a plurality of air holes are provided on the peripheral wall of the cone. The air holes are distributed in the upper part of the peripheral wall of the cone, and the upper end of the cone is connected to the lower end of the first pipeline.

[0028] To address the aforementioned technical problems, the present invention further provides the following technical solution:

[0029] A detection method using the above-mentioned natural hydrogen detection device includes the following steps:

[0030] Step 100: After excavating a detection well in the detection area in advance, lower the pipeline components and airbag of the detection device into the well;

[0031] Step 200: Inflate the airbag through the second pipeline in the pump set and pipeline assembly, so that the airbag expands and presses against the inner wall of the well to seal it, forming the bottom sampling area;

[0032] Step 300: Use the pump set to extract and discharge the gas in the bottom sampling area of ​​the well, create a negative pressure environment in the bottom sampling area to guide the underground gas into the bottom sampling area, and switch the first pipeline in the pipeline assembly to connect with the sample container, so as to guide the gas in the bottom sampling area of ​​the well into the sample container through the first pipeline.

[0033] Step 400: After the pressure inside the sample container reaches the set value, quantitatively detect the gas inside the sample container to obtain and record the hydrogen content.

[0034] Step 500: After recording is completed, repeat steps 300 to 400 a preset number of times to obtain multiple quantitative detection data for analyzing the hydrogen reservoir.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] This invention utilizes an airbag to seal the exploration well, and then constructs a detection channel through a first pipeline, a pump set, and a sample container. This detection channel is used to extract the bottom gas from the well, which is isolated from the outside air, into the sample container for detection. At the same time as the detection, a negative pressure is created to guide the bottom gas, so as to achieve multiple extractions of bottom gas into the sample container for quantitative detection in a short period of time, providing a large amount of reliable data for hydrogen reservoir analysis. Attached Figure Description

[0037] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of the natural hydrogen detection device provided in an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the gasbag portion of the natural hydrogen detection device provided in an embodiment of the present invention;

[0040] Figure 3A schematic diagram of the operation of the pump set, the first pipeline, and the second pipeline of the natural hydrogen detection device provided in an embodiment of the present invention;

[0041] Figure 4 A schematic diagram of the operation of the pump group, the first pipeline, the second pipeline, and the third pipeline of the natural hydrogen detection device provided in the embodiments of the present invention.

[0042] The labels in the diagram represent the following:

[0043] 1-Pipeline assembly; 2-Airbag; 3-Main unit;

[0044] 11-First tubing; 12-Second tubing; 13-Third tubing; 14-Conical tube; 21-Core tube; 22-Annular capsule; 23-End cap; 31-Pump assembly; 32-Sample container;

[0045] 111-First pipe section; 112-First socket joint; 113-First insertion joint; 121-Second pipe section; 122-Second socket joint; 123-Second insertion joint; 141-Air hole; 221-Elastic ring; 231-Through hole. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] like Figure 1 , Figure 3 As shown, the present invention provides a natural hydrogen detection device, comprising:

[0048] Pipeline assembly 1 is suspended in a pre-excavated exploration well. Pipeline assembly 1 includes a first pipeline 11 and a second pipeline 12.

[0049] Airbag 2 is installed on pipeline assembly 1. Airbag 2 is connected to the second pipeline 12, and the first pipeline 11 passes through airbag 2.

[0050] The main unit 3 is located outside the detection well. Inside the main unit 3, there is a pump set 31 and a sample container 32. The negative pressure port of the pump set 31 is connected to the exhaust port of the first pipeline 11 and the sample container 32 through a multi-channel valve. The positive pressure port of the pump set 31 is connected to the air inlet of the second pipeline 12 and the sample container 32 through a multi-channel valve. One of the ports of the multi-channel valve is normally open as an exhaust port.

[0051] Specifically, the main unit 3 is placed outside the wellhead for operation. It is equipped with multiple pressure gauges to display the pressure in various areas and has multiple buttons for controlling or selecting corresponding functions, specifically:

[0052] The airbag 2 is inflated to the set pressure through the pump unit 31, the multi-channel valve, and the second pipeline 12.

[0053] The set pressure is achieved by drawing a vacuum at the bottom of the well through pump set 31, multi-channel valve and first pipeline 11;

[0054] The sample container 32 is evacuated to the set pressure by pump group 31, multi-channel valve and multi-channel valve;

[0055] The air at the bottom of the well is drawn into the sample container 32 through the pump set 31, multi-channel valve, multi-channel valve and first pipeline 11 to reach the set pressure.

[0056] Among them, the pump unit 31 can inflate the airbag 2 through the second pipeline 12 to expand and press against the well wall, thereby sealing and isolating the well bottom environment from the external environment. After isolation, the pump unit 31 can discharge the well bottom air through the first pipeline 11 and form a negative pressure to increase the underground hydrogen permeation and diffusion rate by utilizing the pressure difference.

[0057] The sample container 32 is equipped with a sensor for detecting hydrogen content. The pump unit 31 can transport the bottom gas to the sample container 32 through the first pipeline 11 for quantitative detection, and form a negative pressure environment at the bottom of the well when transporting the bottom gas, so as to achieve negative pressure guidance of the bottom gas.

[0058] Furthermore, the host 3 can record the hydrogen content value of each quantitative detection in the sample container 32.

[0059] Specifically, after the host 3 inflates the airbag 2 through the pump group 31 and the second pipeline 12, the airbag 2 expands and presses against the well wall to seal the bottom of the well. The original air at the bottom of the well is discharged through the pump group 31 and the first pipeline 11 to form a negative pressure. The original air in the sample container 32 is evacuated through the pump group 31. After the underground gas enters the bottom of the well through permeation, the pressure at the bottom of the well gradually recovers (the pressure in the first pipeline 11 gradually recovers). When the set detection pressure is reached, the gas at the bottom of the well is discharged into the sample container 32 through the pump group 31 and the first pipeline 11. At this time, the sensor in the sample container 32 can detect the hydrogen content of the gas inside. At the same time, the bottom of the well continues to maintain a negative pressure to guide the underground gas. Thus, after the pressure at the bottom of the well recovers to the set value each time, it can be automatically discharged into the sample container 32 for quantitative detection. By recording the hydrogen content of each detection, reliable data is provided for the analysis of underground hydrogen reservoirs.

[0060] This invention utilizes an airbag 2 to seal the exploration well, and then constructs a detection channel through a first pipeline 11, a pump set 31, and a sample container 32. This detection channel is used to extract bottom gas isolated from external air into the sample container 32 for detection. At the same time as detection, a negative pressure is created to guide the bottom gas, so as to realize multiple extractions of bottom gas into the sample container 32 for quantitative detection in a short period of time, providing a large amount of reliable data for hydrogen reservoir analysis.

[0061] Compared to existing methods that use free-flowing diffusion to detect hydrogen reservoirs, this invention can force the underground gas to flow into the well through negative pressure guidance, thereby increasing the diffusion rate. Furthermore, it uses a sample container 32 to quantitatively detect the hydrogen content in the gas entering the well, thus obtaining the hydrogen content recorded in chronological order in a quantitative and repeated manner. This allows for the provision of a large amount of reliable data for analyzing underground hydrogen reservoirs in a relatively short period of time.

[0062] like Figure 2 As shown, the airbag 2 includes a core cylinder 21, an annular bladder 22 is provided on the outer peripheral wall of the core cylinder 21, and the two ends of the core cylinder 21 are sealed by end caps 23.

[0063] A through hole 231 is provided on the end cap 23. The pipeline assembly 1 passes through the through hole 231 through the end cap 23 and the gap between the through hole 231 and the pipeline assembly 1 is sealed by a sealing ring. Inside the core cylinder 21, there is an air nozzle that connects to the annular bladder 22. The second pipeline 12 is connected to the air nozzle of the annular bladder 22 inside the core cylinder 21.

[0064] In this embodiment, the airbag 2 adopts an assembled structure, which is composed of a core cylinder 21, an annular bladder body 22 and an end cap 23. During the assembly process, the first pipe 11 and the second pipe 12 pass through the through hole 231, thereby enabling the position of the airbag 2 to be freely adjusted to adapt to different exploration wells and different bottom space.

[0065] Furthermore, using a sealing ring to seal the through hole 231 can increase the sealing performance and prevent external air from affecting the bottom detection area. Based on this, the sealing and isolation effect is further improved, and the following preferred embodiments are provided.

[0066] like Figure 1 As shown, two airbags 2 are provided on the pipeline assembly 1. One airbag 2 is located in the lower part of the pipeline assembly 1 and is placed in the bottom area of ​​the well. The other airbag 2 is located in the upper part of the pipeline assembly 1 and is placed in the wellhead area, so as to perform secondary sealing in the exploration well, forming the exploration area below the lower airbag 2 and the isolation area between the two airbags 2.

[0067] Furthermore, the nozzles of both annular bladders 22 are connected to the second pipeline 12, and the first pipeline 11 passes through the two core cylinders 21 in sequence along the through hole 231.

[0068] In this embodiment, two airbags 2 are used to form a secondary seal inside the well, that is, an isolation area is formed above the detection area at the bottom of the well, which further reduces the impact of external air on the detection area.

[0069] Furthermore, such as Figure 1 , Figure 4 As shown, the pipeline assembly 1 also includes a third pipeline 13. The negative pressure port of the pump unit 31 is connected to the first pipeline 11, the exhaust port of the sample container 32 and the upper end of the third pipeline 13 respectively through a multi-channel valve. The lower end of the third pipeline 13 is located between the two airbags 2 to form a negative pressure in the isolation area.

[0070] In this embodiment, by setting up a third pipeline 13, the isolation area is evacuated to a set value through the pump group 31 and the third pipeline 13, thereby reducing the flow of air from the isolation area through the stratum to the detection area, and further reducing the impact of air on the gas in the detection area.

[0071] In addition, to further improve the isolation and sealing effect, such as Figure 1 , Figure 2 As shown, multiple elastic rings 221 are provided on the outer peripheral wall of the annular bladder 22. The multiple elastic rings 221 are equidistantly arranged along the axial direction, and the elastic rings 221 can deform under pressure to fit the well wall, so as to form a multi-layer seal between the annular bladder 22 and the well wall.

[0072] In this embodiment, by providing multiple elastic rings 221 on the outer peripheral wall of the annular bladder 22, when the annular bladder 22 expands and is squeezed, the elastic rings 221 are squeezed and deformed on the well wall, so that the elastic rings 221 fit the well wall. The multiple elastic rings 221 provide multi-layer sealing in the contact area between the annular bladder 22 and the well wall, thus providing a sealing effect.

[0073] like Figure 2 As shown, the first pipeline 11 is composed of multiple first pipe sections 111 connected in sequence. A first socket joint 112 and a first plug joint 113 are respectively provided at both ends of the first pipe section 111. Two adjacent first pipe sections 111 are connected by the first socket joint 112 and the first plug joint 113.

[0074] The second pipeline 12 is composed of multiple second pipe sections 121 connected in sequence. A second socket joint 122 and a second plug joint 123 are respectively provided at both ends of the second pipe section 121. Two adjacent second pipe sections 121 are connected by the second socket joint 122 and the second plug joint 123.

[0075] In this embodiment, both the first pipeline 11 and the second pipeline 12 adopt a multi-segment structure, so that the number of the first pipe section 111 and the second pipe section 121 can be adjusted according to the depth of the exploration well, thereby adjusting the length of the first pipeline 11 and the second pipeline 12.

[0076] In addition, such as Figure 2 As shown, the lengths of the multiple first tubes 111 are equal or unequal. The two ends of the first tubes 111 inside the core cylinder 21 pass through the through holes 231 on the two end caps 23 respectively, and the first connector 112 and the first plug connector 113 are connected to the first tubes 111 outside the core cylinder 21.

[0077] In this embodiment, the first section tube 111, the first socket 112, and the first plug 113 adopt an assembly connection structure, which facilitates the installation of the first section tube 111 on the two end caps 23 through the through hole 231, thereby forming the airbag 2 with one of the first section tubes 111 as a whole, and facilitating the quick connection of the remaining first section tubes 111 of the first pipeline 11 and the remaining second section tubes 121 of the second pipeline 12 to adjust the position of the airbag 2.

[0078] Similarly, such as Figure 2 As shown, the lengths of the multiple second-section tubes 121 may be equal or unequal;

[0079] The two ends of the second section tube 121 inside the upper core tube 21 pass through the through holes 231 on the two end caps 23 respectively. The second connector 122 and the second plug connector 123 are connected to the second section tube 121 outside the core tube 21.

[0080] The upper end of the second section tube 121 inside the lower core tube 21 passes through the through hole 231 on the end cap 23, and its lower end is closed inside the core tube 21. The second connector 122 or the second plug connector 123 is connected to the second section tube 121 outside the core tube 21.

[0081] Furthermore, a connector is provided in the middle of the second section tube 121 inside the upper and lower core tube 21, and the connector of the second section tube 121 is connected to the air nozzle of the annular bladder 22 inside the core tube 21.

[0082] In this embodiment, the second section tube 121 and the second socket joint 122 or the second plug joint 123 adopt an assembly connection structure, which facilitates the second section tube 121 to be installed on the two end caps 23 through the through hole 231, thereby forming the airbag 2 with one of the first section tubes 111 and one of the second section tubes 121 as a whole, which facilitates the quick connection of the remaining first section tubes 111 of the first pipeline 11 and the remaining second section tubes 121 of the second pipeline 12 to adjust the position of the airbag 2.

[0083] Of course, to avoid drawing in solid particles (mud, rock cuttings, etc.) from the bottom of the well while creating a vacuum in the exploration area, such as Figure 1 As shown, a cone 14 is installed at the lower end of the pipeline assembly 1. Multiple air holes 141 are provided on the peripheral wall of the cone 14. The air holes 141 are distributed in the upper part of the peripheral wall of the cone 14, and the upper end of the cone 14 is connected to the lower end of the first pipeline 11.

[0084] In this embodiment, the cone 14 is placed at the bottom of the well to prevent the end of the first pipeline 11 from contacting the bottom of the well. After the cone 14 is connected to the first pipeline 11, the first pipeline 11 can be sucked through the air holes 141 on the peripheral wall of the cone 14. The air holes 141 are distributed at a height higher than the bottom of the well, thereby avoiding the suction of solid particles that could cause pipeline blockage.

[0085] Based on the aforementioned natural hydrogen detection device, a method for detecting natural hydrogen is provided, comprising the following steps:

[0086] Step 100: After excavating a detection well in the detection area in advance, lower the pipeline components and airbag of the detection device into the well;

[0087] Step 200: Inflate the airbag through the second pipeline in the pump set and pipeline assembly, so that the airbag expands and presses against the inner wall of the well to seal it, forming the bottom sampling area;

[0088] Step 300: Use the pump set to extract and discharge the gas in the bottom sampling area of ​​the well, create a negative pressure environment in the bottom sampling area to guide the underground gas into the bottom sampling area, and switch the first pipeline in the pipeline assembly to connect with the sample container, so as to guide the gas in the bottom sampling area of ​​the well into the sample container through the first pipeline.

[0089] Step 400: After the pressure inside the sample container reaches the set value, quantitatively detect the gas inside the sample container to obtain and record the hydrogen content.

[0090] Step 500: After recording is completed, repeat steps 300 to 400 a preset number of times to obtain multiple quantitative detection data for analyzing the hydrogen reservoir.

[0091] Specifically, based on the detection requirements, after excavating a detection well in the detection area, airbag 2 (or two airbags) and pipeline assembly 1 are placed into the detection well (the upper airbag is located in the wellhead area and placed below the wellhead). The operating host 3 controls the pump group 31 and multi-channel valve to inflate the airbag 2, and the inflation automatically stops when the set pressure is reached (i.e., Figure 3 , Figure 4 (Step S1 in the text).

[0092] At this point, the airbag 2 inflates and adheres tightly to the well wall to form a seal, creating a detection area at the bottom of the well. Switching to automatic operating mode, the main unit 3 automatically evacuates the detection area and discharges the air extracted at this time (i.e.,...). Figure 3 , Figure 4 In step S2 of the process, the vacuuming automatically stops after the required vacuum level is reached. Then, the sample container 32 is vacuumed again, and the vacuuming automatically stops after the required vacuum level is reached (i.e., ...). Figure 3 , Figure 4 (Step S3 in the text).

[0093] The host unit 3 monitors the pressure inside the first pipeline 11 in real time. After the pressure inside the first pipeline 11 returns to the set value, the host unit 3 evacuates the detection area and discharges gas into the sample container 32. The evacuation process automatically stops after the required vacuum is achieved. Figure 3 , Figure 4 In step S4 of the process, the sensor inside sample container 32 detects the hydrogen content in the internal gas. The host 3 records the current detected content value and time. After recording, the host 3 evacuates sample container 32 and automatically stops after the required vacuum level is reached (i.e., ...). Figure 3 , Figure 4 (Step S3 in the text).

[0094] When the host 3 detects that the pressure inside the first pipeline 11 has returned to the set value, the host 3 evacuates the detection area and discharges gas into the sample container 32. It automatically stops after the required vacuum is achieved (i.e.,...). Figure 3 , Figure 4 In step S4 of the process, the sensor inside sample container 32 detects the hydrogen content in the internal gas. The host 3 records the current detected content value and time. After recording, the host 3 evacuates sample container 32 and automatically stops after the required vacuum level is reached (i.e., ...). Figure 3 , Figure 4 (Step S3 in the text).

[0095] Continuous loop (i.e.) Figure 3 , Figure 4 (Steps S3-S4 in the process) record the hydrogen content in the underground gas in chronological order during the installation of the detection device, so as to provide a large amount of reliable data for the analysis of underground hydrogen reservoirs.

[0096] The vacuuming of the first pipeline 11 and the third pipeline 13 are performed in stages. First, the third pipeline 13 is evacuated (i.e., the isolation area), and then the first pipeline 11 is evacuated (i.e., the detection area). Furthermore, when the vacuum level of the third pipeline 13 is insufficient (i.e., the pressure is higher than the set negative pressure threshold), the host 3 can control the pump group 31 to start at any non-working time to evacuate the third pipeline 13 to a level lower than the set threshold.

[0097] It should be noted that the host 3 of the present invention has multiple pressure sensors, which are connected to the ports of the multi-channel valve (except for the normally open exhaust port) to detect the pressure in the first pipeline 11 (i.e., the pressure in the detection area), the pressure in the second pipeline 12 (i.e., the pressure in the airbag 2), and the pressure in the sample container 32 (quantitative detection). Adding pressure sensors is a conventional technology, which is not shown in the figure and will not be described in detail here.

[0098] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A natural hydrogen detection device, characterized in that, include: Pipeline assembly (1), which is suspended in a pre-excavated exploration well, the pipeline assembly (1) includes a first pipeline (11) and a second pipeline (12). An airbag (2) is disposed on the tubing assembly (1), the airbag (2) is connected to the second tubing (12), and the first tubing (11) passes through the airbag (2). The host (3) is located outside the detection well. The host (3) has a pump set (31) and a sample container (32). The negative pressure port of the pump set (31) is connected to the exhaust port of the first pipeline (11) and the sample container (32) through a multi-channel valve. The positive pressure port of the pump set (31) is connected to the air inlet of the second pipeline (12) and the sample container (32) through a multi-channel valve. One of the ports of the multi-channel valve is normally open as an exhaust port. The pump set (31) can inflate the airbag (2) through the second pipeline (12) to expand and press against the well wall, thereby sealing and isolating the well bottom environment from the external environment. After isolation, the pump set (31) can discharge the well bottom air through the first pipeline (11) and form a negative pressure to increase the underground hydrogen permeation and diffusion rate by utilizing the pressure difference. The sample container (32) is equipped with a sensor for detecting hydrogen content. The pump group (31) can transport the bottom gas to the sample container (32) through the first pipeline (11) for quantitative detection, and form a negative pressure environment at the bottom of the well when transporting the bottom gas, so as to achieve negative pressure guidance of the bottom gas. Furthermore, the host (3) is capable of recording the hydrogen content value of each quantitative detection of the sample container (32); The airbag (2) includes a core tube (21), an annular bladder (22) is provided on the outer peripheral wall of the core tube (21), and the two ends of the core tube (21) are sealed by end caps (23); A through hole (231) is provided on the end cap (23), the pipeline assembly (1) passes through the end cap (23) through the through hole (231), and the gap between the through hole (231) and the pipeline assembly (1) is sealed by a sealing ring. The core cylinder (21) has an air nozzle that communicates with the annular bladder (22) inside, and the second pipeline (12) is connected to the air nozzle of the annular bladder (22) inside the core cylinder (21). Two airbags (2) are provided on the pipeline assembly (1), one of the airbags (2) is located in the lower part of the pipeline assembly (1) and placed in the bottom area of ​​the well, and the other airbag (2) is located in the upper part of the pipeline assembly (1) and placed in the wellhead area, so as to perform secondary sealing in the exploration well, forming an exploration area below the lower airbag (2) and an isolation area between the two airbags (2); Furthermore, the air nozzles of both annular bladders (22) are connected to the second pipeline (12), and the first pipeline (11) passes through the two core cylinders (21) in sequence along the through hole (231). The pipeline assembly (1) also includes a third pipeline (13). The negative pressure port of the pump group (31) is connected to the first pipeline (11), the exhaust port of the sample container (32) and the upper end of the third pipeline (13) respectively through a multi-channel valve. The lower end of the third pipeline (13) is located between the two airbags (2) to form a negative pressure in the isolation area. The host (3) records the hydrogen content in the gas entering the well in the sample container (32) multiple times in a time sequence, thereby obtaining the hydrogen content recorded in time sequence.

2. The natural hydrogen detection device according to claim 1, characterized in that, Multiple elastic rings (221) are provided on the outer peripheral wall of the annular bladder (22). The multiple elastic rings (221) are equidistant along the axial direction, and the elastic rings (221) can be deformed under pressure to fit the well wall, so as to form a multi-layer seal between the annular bladder (22) and the well wall.

3. A natural hydrogen detection device according to claim 1 or 2, characterized in that, The first pipeline (11) is composed of multiple first pipe sections (111) connected in sequence. A first socket joint (112) and a first plug joint (113) are respectively provided at the two ends of the first pipe section (111). Two adjacent first pipe sections (111) are connected by the first socket joint (112) and the first plug joint (113). The second pipeline (12) is composed of multiple second pipe sections (121) connected in sequence. A second socket joint (122) and a second plug joint (123) are respectively provided at the two ends of the second pipe section (121). Two adjacent second pipe sections (121) are connected by the second socket joint (122) and the second plug joint (123).

4. A natural hydrogen detection device according to claim 3, characterized in that, The lengths of the first tubes (111) are equal or unequal. The two ends of the first tubes (111) inside the core tube (21) pass through the through holes (231) on the two end caps (23), and the first connector (112) and the first plug (113) are connected to the first tubes (111) outside the core tube (21).

5. A natural hydrogen detection device according to claim 4, characterized in that, The lengths of multiple second section tubes (121) may be equal or unequal; The two ends of the second section tube (121) inside the upper core tube (21) pass through the through holes (231) on the two end caps (23), respectively. The second connector (122) and the second plug (123) are connected to the second section tube (121) outside the core tube (21). The upper end of the second section tube (121) in the lower core tube (21) passes through the through hole (231) on the end cap (23), and its lower end is closed in the core tube (21). The second connector (122) or the second plug (123) is connected to the second section tube (121) outside the core tube (21). Furthermore, a connector is provided in the middle of the second section tube (121) inside the upper and lower core tubes (21), and the connector of the second section tube (121) is connected to the air nozzle of the annular bladder (22) inside the core tube (21).

6. A natural hydrogen detection device according to claim 1, characterized in that, A cone (14) is installed at the lower end of the pipeline assembly (1). A plurality of air holes (141) are provided on the peripheral wall of the cone (14). The air holes (141) are distributed in the upper part of the peripheral wall of the cone (14), and the upper end of the cone (14) is connected to the lower end of the first pipeline (11).

7. A detection method using the natural hydrogen detection device according to any one of claims 1-6, characterized in that, Includes the following steps: Step 100: After excavating a detection well in the detection area in advance, lower the pipeline components and airbag of the detection device into the well; Step 200: Inflate the airbag through the second pipeline in the pump set and pipeline assembly, so that the airbag expands and presses against the inner wall of the well to seal it, forming the bottom sampling area; Step 300: Use the pump set to extract and discharge the gas in the bottom sampling area of ​​the well, create a negative pressure environment in the bottom sampling area to guide the underground gas into the bottom sampling area, and switch the first pipeline in the pipeline assembly to connect with the sample container, so as to guide the gas in the bottom sampling area of ​​the well into the sample container through the first pipeline. Step 400: After the pressure inside the sample container reaches the set value, quantitatively detect the gas inside the sample container to obtain and record the hydrogen content. Step 500: After recording is completed, repeat steps 300 to 400 a preset number of times to obtain multiple quantitative detection data for analyzing the hydrogen reservoir.

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