CN-121047582-B - Natural hydrogen detection device and detection method

CN121047582BCN 121047582 BCN121047582 BCN 121047582BCN-121047582-B

Abstract

The invention discloses a natural hydrogen detection device which comprises a pipeline assembly, an air bag, a host, a multi-channel valve and a detection method, wherein the pipeline assembly comprises a first pipeline and a second pipeline, the air bag is communicated with the second pipeline, the first pipeline penetrates through the air bag, a pump group and a sample container are arranged in the host, a negative pressure port of the pump group is connected with an air outlet of the first pipeline and the sample container through the multi-channel valve, a positive pressure port of the pump group is connected with an air inlet of the second pipeline and the sample container through the multi-channel valve, and one port of the multi-channel valve is normally opened to serve as the air outlet. After the detection well is closed by the air bag, a detection channel is formed by the first pipeline, the pump group and the sample container, the bottom hole gas isolated from external air is pumped into the sample container by the detection channel for detection, and negative pressure guide is formed on the bottom hole gas during detection, so that quantitative detection is realized by pumping the bottom hole gas into the sample container for multiple times in a short time, and a large amount of reliable data is provided for hydrogen gas reservoir analysis.

Inventors

PANG SHOUJI
SHAN YANSHENG
LIU HUI
WANG RUI
MENG FANYANG
DONG SHIMING
MIAO MIAO
LU CHENG
ZHANG CONG
ZHANG SHUAI
FANG RONGHUI
TENG GEER
LIU QING
LI CHUNXIN
YIN JIANGUO

Assignees

中国地质调查局油气资源调查中心

Dates

Publication Date: 20260512
Application Date: 20250804

Claims (7)

1. A natural hydrogen detecting apparatus, comprising: A pipeline assembly (1), the pipeline assembly (1) being suspended within a pre-excavated detection well, the pipeline assembly (1) comprising a first pipeline (11) and a second pipeline (12); An air bag (2) arranged on the pipeline assembly (1), wherein the air bag (2) is communicated with the second pipeline (12), and the first pipeline (11) passes through the air bag (2); the host (3) is arranged outside the detection well, a pump group (31) and a sample container (32) are arranged in the host (3), a negative pressure port of the pump group (31) is connected with the first pipeline (11) and an exhaust port of the sample container (32) through a multi-channel valve, a positive pressure port of the pump group (31) is connected with the second pipeline (12) and an air inlet of the sample container (32) through a multi-channel valve, and one port of the multi-channel valve is normally opened to serve as the exhaust port; The pump set (31) can inflate the air bag (2) through the second pipeline (12) to expand and abut against a well wall, the well bottom environment and the external environment are sealed and isolated, and after the isolation, the pump set (31) can discharge the well bottom air through the first pipeline (11) and form negative pressure so as to improve the permeation and diffusion speed of the hydrogen at the bottom by utilizing the pressure difference; A sensor for detecting the hydrogen content is arranged in the sample container (32), the pump group (31) can convey the bottom hole gas to the sample container (32) through the first pipeline (11) for quantitative detection, and a negative pressure environment is formed at the bottom hole when the bottom hole gas is conveyed, so that the negative pressure guide of the bottom hole gas is realized; And the host (3) is capable of recording a hydrogen content value for each quantitative detection of the sample container (32); The air bag (2) comprises a core barrel (21), an annular bag body (22) is arranged on the peripheral wall of the core barrel (21), and two ends of the core barrel (21) are sealed through end covers (23); the end cover (23) is provided with a through hole (231), the pipeline assembly (1) passes through the end cover (23) through the through hole (231), a gap between the through hole (231) and the pipeline assembly (1) is sealed through a sealing ring, an air tap communicated with the annular bag body (22) is arranged inside the core barrel (21), and the second pipeline (12) is connected with the air tap of the annular bag body (22) inside the core barrel (21); two air bags (2) are arranged on the pipeline assembly (1), one air bag (2) is positioned at the lower part of the pipeline assembly (1) and is arranged in a well bottom area, the other air bag (2) is positioned at the upper part of the pipeline assembly (1) and is arranged in a well mouth area so as to perform secondary sealing in a detection well, and a detection area positioned below the lower air bag (2) and an isolation area positioned between the two air bags (2) are formed; the air nozzles of the two annular bag bodies (22) are communicated with the second pipeline (12), and the first pipeline (11) sequentially passes through the two core cylinders (21) along the through holes (231); The pipeline assembly (1) further comprises a third pipeline (13), the negative pressure port of the pump group (31) is respectively connected with the first pipeline (11), the exhaust port of the sample container (32) and the upper end of the third pipeline (13) through a multi-channel valve, and the lower end of the third pipeline (13) is positioned between the two air bags (2) so as to form negative pressure in an isolation area; Wherein the host computer (3) quantitatively detects the hydrogen content in the gas entering the well by recording the hydrogen content in the sample container (32) a plurality of times in time series, thereby obtaining the hydrogen content recorded in time series.
2. A natural hydrogen detecting apparatus according to claim 1, wherein, A plurality of elastic bag rings (221) are arranged on the peripheral wall of the annular bag body (22), the elastic bag rings (221) are equidistantly arranged along the axis direction, and the elastic bag rings (221) can be pressed and deformed to be attached to the well wall so as to form multi-layer sealing between the annular bag body (22) and the well wall.
3. A natural hydrogen detecting apparatus according to claim 1 or 2, wherein, The first pipeline (11) is formed by sequentially butting a plurality of first joint pipes (111), a first socket joint (112) and a first plug joint (113) are respectively arranged at two end parts of each first joint pipe (111), and two adjacent first joint pipes (111) are connected in a plug-in mode through the first socket joint (112) and the first plug joint (113); The second pipeline (12) is formed by sequentially butt-jointing a plurality of second joint pipes (121), two end parts of each second joint pipe (121) are respectively provided with a second socket joint (122) and a second plug joint (123), and two adjacent second joint pipes (121) are connected in a butt-plug manner through the second socket joints (122) and the second plug joints (123).
4. A natural hydrogen detecting apparatus according to claim 3, wherein, The lengths of the first section pipes (111) are equal or unequal, two ends of the first section pipes (111) in the core barrel (21) respectively pass through the through holes (231) on the two end covers (23), and the first socket joint (112) and the first plug joint (113) are connected with the first section pipes (111) outside the core barrel (21).
5. A natural hydrogen detecting apparatus according to claim 4, wherein, The lengths of the second section pipes (121) are equal or unequal; Two ends of the second joint pipe (121) in the upper core barrel (21) respectively penetrate through the through holes (231) on the two end covers (23), and the second socket joint (122) and the second plug joint (123) are connected with the second joint pipe (121) outside the core barrel (21); the upper end of the second joint pipe (121) in the core barrel (21) of the lower layer passes through the through hole (231) on the end cover (23), the lower end of the second joint pipe is sealed in the core barrel (21), and the second socket joint (122) or the second plug joint (123) is connected with the second joint pipe (121) outside the core barrel (21); And the middle parts of the second joint pipes (121) in the upper and lower core barrels (21) are provided with joints, and the joints of the second joint pipes (121) are connected with the air tap of the annular bag body (22) in the core barrel (21).
6. A natural hydrogen detecting apparatus according to claim 1, wherein, The lower end of the pipeline assembly (1) is provided with a cone (14), the peripheral wall of the cone (14) is provided with a plurality of air holes (141), the air holes (141) are distributed at the middle upper part of the peripheral wall of the cone (14), and the upper end of the cone (14) is in butt joint communication with the lower end of the first pipeline (11).
7. A detection method using the natural hydrogen detecting apparatus as claimed in any one of claims 1 to 6, comprising the steps of: Step 100, after a detection well is excavated in a detection area in advance, a pipeline assembly and an air bag of the detection device are lowered into the well; Step 200, inflating the air bag through a pump group and a second pipeline in the pipeline assembly, so that the air bag is closed against the inner wall of the well after being inflated, and a well bottom acquisition area is formed; Step 300, extracting and discharging gas in a well bottom collecting area by using a pump set, forming a negative pressure environment in the well bottom collecting area to guide the gas in the ground to enter the well bottom collecting area, switching a first pipeline in a pipeline assembly to be communicated with a sample container, and guiding the gas in the well bottom collecting area to enter the sample container through the first pipeline; Step 400, quantitatively detecting gas in the sample container after the pressure in the sample container reaches a set value so as to obtain and record the hydrogen content; And 500, after the recording is completed, repeating the steps 300-400 for a preset number of times again to obtain data for analyzing the repeated quantitative detection of the hydrogen gas reservoir.

Description

Natural hydrogen detection device and detection method Technical Field The invention relates to the technical field of gas reservoir detection, in particular to a natural hydrogen detection device and a natural hydrogen detection method. Background Natural hydrogen is a hydrogen energy source at the ground, and compared with chemical hydrogen production, the exploitation of natural hydrogen can effectively reduce carbon emission in the process of obtaining hydrogen. But natural hydrogen production requires detection in advance in the planned area for a certain time to obtain more data to improve the production success rate. At present, natural hydrogen is detected by adopting a natural overflowing mode, namely, a part of the ground is covered by a sealed container in a planning area, gas in the detection area is prevented from overflowing and forming internal and external isolation, a well is opened on the ground in the detection area, a filter device is placed on the ground, the filter device is connected with gas monitoring equipment positioned outside the sealed container through a pipeline, and the hydrogen scattered at the ground flows to the gas monitoring equipment through a pipeline to obtain data. Although this way of using the hydrogen gas isolated from the outside air and guiding free dissipation to be conveyed to the gas monitoring device in a directional manner to obtain data can provide data for analyzing the underground hydrogen gas reservoir, the rate of hydrogen gas dissipation is generally slow due to the influence of the formation gap resistance, that is, the gas monitoring device usually needs a long time to obtain a small amount of gas for detection, and as the amount of hydrogen gas dissipation in the sealed container increases, the internal pressure increases, further affecting the rate of hydrogen gas dissipation, thereby affecting the detection efficiency of the hydrogen gas reservoir. Therefore, the existing detection device for acquiring data by directionally conveying hydrogen gas which isolates external air and guides free dissipation to gas monitoring equipment is difficult to lift the overflow rate of underground hydrogen gas by adopting passive guide after isolating the external air, so that the detection efficiency of a hydrogen gas reservoir is affected. Disclosure of Invention The invention aims to provide a natural hydrogen detection device and a natural hydrogen detection method, which are used for solving the technical problem that the detection efficiency of a hydrogen gas reservoir is affected by the fact that the escape rate of underground hydrogen is difficult to lift by adopting passive guidance after external air is isolated in the prior art. In order to solve the technical problems, the invention specifically provides the following technical scheme: a natural hydrogen detection device comprising: The pipeline assembly is suspended in the pre-excavated detection well and comprises a first pipeline and a second pipeline; the air bag is arranged on the pipeline assembly, the air bag is communicated with the second pipeline, and the first pipeline penetrates through the air bag; The system comprises a main machine, a detection well, a first pipeline, a second pipeline, a sample container, a multi-channel valve, a pump set, a sample container and a sample container, wherein the main machine is arranged outside the detection well, the main machine is internally provided with the pump set and the sample container, a negative pressure port of the pump set is connected with the first pipeline and the exhaust port of the sample container through the multi-channel valve, a positive pressure port of the pump set is connected with the second pipeline and the air inlet of the sample container through the multi-channel valve, and one port of the multi-channel valve is normally opened to serve as the exhaust port; The pump set can inflate the air bag through the second pipeline to expand and abut against a well wall, the well bottom environment and the external environment are sealed and isolated, and after the isolation, the pump set can exhaust the air at the well bottom through the first pipeline and form negative pressure so as to improve the permeation and diffusion speed of the hydrogen at the bottom of the earth by utilizing the pressure difference; The sensor for detecting the hydrogen content is arranged in the sample container, the pump set can convey the bottom hole gas to the sample container through the first pipeline for quantitative detection, and a negative pressure environment is formed at the bottom of the well when the bottom hole gas is conveyed, so that negative pressure guiding of the bottom hole gas is realized. And the host is able to record the hydrogen content value for each quantitative detection of the sample container. As a preferable mode of the invention, the air bag comprises a core barrel, an annular bag body is arranged on the peripheral wall of