Probe device for high-precision detection of trace marsh gas in prospecting and application method thereof

Abstract

This invention relates to the field of engineering geological exploration technology, specifically to a probe device and its application method for high-precision detection of trace amounts of biogas during exploration. The device includes a gas collection tank and a probe rod embedded within the tank. The probe rod can be raised or lowered relative to the tank. The top of the probe rod extends into the tank, and the bottom extends beyond it. A vent is provided on the portion of the probe rod extending beyond the bottom of the tank, communicating with the inner cavity of the tank. The top of the tank has a one-way sealing structure, which seals the tank. The one-way sealing structure closes the inner cavity of the tank when the probe rod is raised and opens when the probe rod is lowered. A biogas detector and a pressure sensor are built into the upper part of the tank's inner cavity. The advantages of this invention are: effective collection and measurement of biogas concentration and pressure in the formation; higher sensitivity and accuracy, providing a more reliable technical means for engineering geological exploration.

Description

Technical Field

[0001] This invention relates to the field of engineering geological exploration technology, specifically to a probe device and its application method for high-precision detection of trace methane in exploration, and more particularly to a high-precision probe device for detecting underground trace methane in engineering geological exploration. Background Technology

[0002] In engineering geological exploration, biogas detection is a crucial step in assessing geological stability, predicting geological hazards, and conducting resource exploration. Traditional biogas detection methods primarily involve collecting and detecting biogas at surface boreholes. This involves drilling holes in the strata to be explored, directly drawing biogas from underground to the surface, and then collecting and detecting the gas. However, surface borehole detection cannot determine the depth of the biogas-bearing strata, thus hindering further remediation of biogas-containing soil layers.

[0003] To overcome the above problems, existing technologies often collect biogas by drilling probes into the soil. For example, utility model patent CN212321570U discloses a gas detection probe for detecting underground harmful gases, which includes a nested structure composed of a piston rod and a sleeve. The piston rod collects biogas from specific soil layers, while the sleeve blocks biogas in other soil layers, thus achieving the purpose of determining the depth of the biogas layer.

[0004] However, the gas-measuring probe, exemplified by the aforementioned utility model patent, uses a gas passage formed by a connected piston rod and the inner cavity of the sleeve to draw in biogas from the air inlet of the piston rod and transmit it to the ground through the top opening of the sleeve. As the depth of the biogas-containing soil layer increases, the biogas transmission path lengthens accordingly. Due to the long transmission path, the biogas pressure and concentration values ​​are continuously lost during transmission, limiting detection accuracy. Therefore, biogas can only be detected when it has a high concentration and high pressure; if the soil layer contains only trace amounts of biogas, it cannot be detected. This undoubtedly poses a challenge to the reliability of engineering geological surveys. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a probe device for high-precision detection of trace biogas in engineering geological exploration. By directly collecting and detecting biogas in the strata below the surface, it avoids the adverse effects of biogas transmission paths, improves the accuracy and sensitivity of biogas detection, and provides strong technical support for engineering geological exploration.

[0006] The objective of this invention is achieved through the following technical solutions: A probe device for high-precision detection of trace amounts of biogas in engineering geological exploration is characterized by comprising a gas collection tank and a probe rod embedded within the gas collection tank, wherein the probe rod can be raised or lowered relative to the gas collection tank; the top of the probe rod extends into the gas collection tank, the bottom extends out of the bottom of the gas collection tank, and the portion of the probe rod extending out of the bottom of the gas collection tank has a vent hole, which communicates with the inner cavity of the gas collection tank; The top of the gas collecting barrel has a one-way sealing structure, and the gas collecting barrel is sealed by the one-way sealing structure. When the probe is lifted, the one-way sealing structure seals the inner cavity of the gas collecting barrel, and when the probe is pressed down, the one-way sealing structure opens. A biogas detector and a pressure sensor are built into the upper part of the inner cavity of the gas collection tank.

[0007] The one-way sealing structure is a pressure relief valve, which opens on one side toward the probe rod, creating a negative pressure zone inside the gas collecting tank.

[0008] The maximum pressure at which the pressure relief valve opens is matched with the upper limit of the pressure detection value of the air pressure sensor.

[0009] The biogas detector and the pressure sensor interact with the ground data receiving instrument via power lines and data lines, respectively.

[0010] The gas collection tank is equipped with a wall brush, which is used to brush the outer wall of the probe.

[0011] The position of the wall brush corresponds to the position of the ventilation hole opened on the probe.

[0012] A hole expander is provided at the bottom of the probe.

[0013] An application method for the aforementioned probe device for high-precision detection of trace methane in engineering geological exploration, characterized in that the application method includes the following steps: Lower the probe device to the depth of the stratum to be detected, and enlarge the aperture with a borehole expander to ensure that biogas and groundwater enter the gas collection tank through the ventilation holes on the probe rod; Raising the probe rod seals the one-way sealing structure, creating a negative pressure zone inside the gas collection tank that attracts a gas-water mixture consisting of groundwater and biogas to flow into it. The biogas rises from the gas-water mixture to form an air bladder. The biogas detector and pressure sensor are activated to directly detect the biogas at the depth of the stratum to be detected.

[0014] The ground data receiving instrument receives and processes the data transmitted by the biogas detector and the gas pressure sensor; after the detection is completed, the probe is pressed down, and the piston structure formed by the gas collection tank and the probe squeezes the one-way sealing structure to discharge the gas-water mixture in the gas collection tank.

[0015] Depending on the type of project to be detected, a suitable sensor can be installed or added inside the gas collection tank to enable simultaneous detection of different projects at the stratum to be detected.

[0016] The advantages of this invention are: it effectively collects and measures the concentration and pressure of methane in the formation in situ; it has higher sensitivity and accuracy, providing a more reliable technical means for engineering geological exploration; its structure is simple and reasonable, and the exploration scenarios can be broadened by replacing the sensor or detection device; it is easy to use and suitable for promotion. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0018] The features and other related features of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, so as to facilitate understanding by those skilled in the art: like Figure 1 As shown in the figure, the markings 1-9 represent: gas collection tank 1, probe rod 2, vent hole 3, vent expander 4, wall brush 5, pressure relief valve 6, biogas detector and pressure sensor 7, air bag 8, power cord and data cable 9.

[0019] Example: The probe device for high-precision detection of trace biogas in engineering geological exploration in this example is used to realize direct biogas detection in strata below the surface.

[0020] Specifically, such as Figure 1 As shown, the main body of the probe device includes a gas collection tank 1 and a probe rod 2, with the probe rod 2 embedded within the gas collection tank 1. The inside of the gas collection tank 1 is hollow, used to collect biogas samples. The probe rod 2 can be raised or lowered relative to the gas collection tank 1. The top of the probe rod 2 extends from the top of the gas collection tank 1, facilitating operation by personnel on the ground; the bottom of the probe rod 2 extends from the bottom of the gas collection tank 1, and the portion of the probe rod 2 extending from the bottom of the gas collection tank 1 has several evenly spaced ventilation holes 3, each ventilation hole 3 communicating with the inner cavity of the gas collection tank 1, allowing biogas to flow into the gas collection tank along with groundwater. A biogas detector and a pressure sensor 7 are built into the upper part of the inner cavity of the gas collection tank 1, both used to accurately measure the concentration and pressure of biogas.

[0021] In this embodiment, as Figure 1As shown, a borehole expander 4 is installed at the bottom of the probe 2. This expander is used to form a borehole or enlarge the diameter of an existing borehole during the detection process, facilitating the inflow of biogas and groundwater while further preventing the intrusion of deep groundwater and gas. The use of the borehole expander 4 can further improve the efficiency and accuracy of biogas detection.

[0022] In this embodiment, as Figure 1 As shown, a wall brush 5 is installed at the bottom of the gas collection tank 1. The wall brush 5 corresponds to the position of the vent hole 3 on the probe rod 2, and is used to prevent the vent hole 3 from being blocked, ensuring that biogas enters the gas collection tank smoothly. When the probe rod 2 is lifted or pressed down, the vent hole 3 on the probe rod 2 is cleaned by the wall brush 5, achieving the purpose of wall brushing.

[0023] In this embodiment, as Figure 1 As shown, a pressure relief valve 6 is installed between the gas collection tank 1 and the probe rod 2. This valve 6 can only be opened towards the probe rod 2, and the maximum pressure at which it opens is the upper limit of the detection pressure. When the probe rod 2 is lifted, the pressure relief valve 6 closes, creating a negative pressure zone inside the gas collection tank 1. This helps groundwater and methane gas to flow in more smoothly, improving detection accuracy. When the probe rod 2 is pressed down, the groundwater and gas in the gas collection tank are discharged through the pressure relief valve 6.

[0024] In this embodiment, as Figure 1 As shown, the biogas detector and pressure sensor 7 interact with the ground data receiving instrument via power and data cables 9. The ground data receiving instrument receives and processes the data transmitted by the biogas detector and pressure sensor 7. This instrument has powerful data processing capabilities, enabling it to display, record, and analyze changes in biogas concentration and pressure in real time, providing strong support for engineering geological exploration.

[0025] When using this embodiment, the following usage process is included: 1) Preparation stage: Assemble the probe device in this embodiment, ensuring that all components are tightly connected and functioning properly. Connect the ground data receiving instrument, biogas detector, and pressure sensor 7 to the power cable 9 via data cable to ensure real-time data transmission.

[0026] 2) Detection Phase: The probe device is lowered to the depth of the stratum to be detected. The aperture is enlarged using the reamer 4 to ensure smooth flow of biogas and groundwater into the gas collection tank. The probe rod 2 and probe are raised, closing the pressure relief valve 6 and creating a negative pressure zone inside the gas collection tank 1. This attracts groundwater and biogas to flow in, forming a gas-water mixture within the gas collection tank 1. The biogas rises and forms a gas bladder 8, effectively sealing the biogas between the water and the biogas detector and pressure sensor 7. At this point, the biogas detector and pressure sensor 7 begin operating, directly and in real-time measuring the biogas concentration and pressure in the gas bladder 8 within the gas collection tank 1 at the depth of the stratum to be detected, and transmitting the data to the ground data receiving instrument, avoiding the detection defects caused by long-path biogas transmission.

[0027] 3) Data processing and analysis: The ground data receiving instrument receives and processes the data transmitted by the biogas detector and the pressure sensor 7.

[0028] 4) Final Stage: After detection is complete, press down probe 2. The piston structure formed by the gas collection tank 1 and the embedded probe opens the pressure relief valve 6, releasing the remaining biogas and groundwater from the gas collection tank 1. After emptying, the entire probe device can be pressed down to other depths in the strata for biogas detection.

[0029] In this embodiment, in addition to detecting methane in the strata, other gases can also be detected by changing the detection instrument built into the gas collection tank 1, so that the probe device designed in this embodiment has a wider range of applications and uses.

[0030] Although the above embodiments have described the concept and embodiments of the present invention in detail with reference to the accompanying drawings, those skilled in the art will recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, and therefore will not be elaborated here.

Claims

1. A probe device for high-precision detection of trace methane in engineering geological exploration, characterized in that: It includes a gas collection tank and a probe embedded in the gas collection tank. The probe can be lifted or pressed down relative to the gas collection tank. The top of the probe extends into the gas collection tank, and the bottom extends out of the bottom of the gas collection tank. The part of the probe extending out of the bottom of the gas collection tank has a vent hole, which communicates with the inner cavity of the gas collection tank. The top of the gas collecting barrel has a one-way sealing structure, and the gas collecting barrel is sealed by the one-way sealing structure. When the gas collecting barrel is lifted, the one-way sealing structure closes the inner cavity of the gas collecting barrel, and the one-way sealing structure opens when the gas collecting barrel is pressed down. A biogas detector and a pressure sensor are built into the upper part of the inner cavity of the gas collection tank.

2. The probe device for high-precision detection of trace methane in engineering geological exploration according to claim 1, characterized in that: The one-way sealing structure is a pressure relief valve, which opens on one side towards the probe rod, creating a negative pressure zone inside the gas collection tank when the gas collection tank is lifted.

3. The probe device for high-precision detection of trace methane in engineering geological exploration according to claim 2, characterized in that: The maximum pressure at which the pressure relief valve opens is matched with the upper limit of the pressure detection value of the air pressure sensor.

4. The probe device for high-precision detection of trace methane in engineering geological exploration according to claim 1, characterized in that: The biogas detector and the pressure sensor interact with the ground data receiving instrument via power lines and data lines, respectively.

5. The probe device for high-precision detection of trace methane in engineering geological exploration according to claim 1, characterized in that: The gas collection tank is equipped with a wall brush, which is used to brush the outer wall of the probe.

6. The probe device for high-precision detection of trace methane in engineering geological exploration according to claim 5, characterized in that: The position of the wall brush corresponds to the position of the ventilation hole opened on the probe.

7. The probe device for high-precision detection of trace methane in engineering geological exploration according to claim 1, characterized in that: A hole expander is provided at the bottom of the probe.

8. A method for applying a probe device for high-precision detection of trace methane in engineering geological exploration, relating to any one of claims 1-7, characterized in that: The application method includes the following steps: Lower the probe device to the depth of the stratum to be detected, and enlarge the aperture with a borehole expander to ensure that biogas and groundwater enter the gas collection tank through the ventilation holes on the probe rod; Lifting the gas collection tank closes the one-way sealing structure, creating a negative pressure zone inside the gas collection tank that attracts a gas-water mixture consisting of groundwater and biogas to flow into it. The biogas rises from the gas-water mixture to form an air bladder. The biogas detector and pressure sensor are activated to directly detect the biogas at the depth of the stratum to be detected.

9. The application method of the probe device for high-precision detection of trace methane in engineering geological exploration according to claim 8, characterized in that: The ground data receiving instrument receives and processes the data transmitted by the biogas detector and the gas pressure sensor; after the detection is completed, the gas collection tank is pressed down, and the piston structure formed by the gas collection tank and the probe squeezes the one-way sealing structure to discharge the gas-water mixture in the gas collection tank.

10. The application method of the probe device for high-precision detection of trace methane in engineering geological exploration according to claim 8, characterized in that: Depending on the type of project to be detected, a suitable sensor can be installed or added inside the gas collection tank to enable simultaneous detection of different projects at the stratum to be detected.

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