CO2 geological sequestration earth surface leakage monitoring device, mounting method and monitoring method

Abstract

The invention provides a CO2 geological sequestration earth surface leakage monitoring device, and belongs to the technical field of gas geological sequestration. Comprising a surface ventilation end and an underground ventilation end which are arranged in multiple layers from top to bottom, and further comprises a test end interface, a test module and a control module, the earth surface ventilation end and the underground ventilation end are both connected with a test end interface with an on-demand opening function, the test end interface is connected with a test module, and the test module is further connected with a control module. Different types of test ends are arranged at a certain underground depth of shallow surface soil and on the surface, the test ends are wrapped with breathable and waterproof breathable materials, and according to the requirements of active measurement, remote measurement, timing measurement and measurement at different layers, the control module opens the end interfaces according to the serial numbers of the tested ends, so that the test ends can be accurately measured. The device is changed into a negative pressure environment by utilizing devices such as a built-in getter pump in the testing device, the change condition of the CO2 concentration of the shallow surface soil is measured, and effective geological storage of CO2 is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of gas geological storage, and particularly relates to a CO2 geological storage surface leakage monitoring device, an installation method and a monitoring method thereof. Background Art

[0002] CO2 geological storage is a core component of CCUS technology, which refers to injecting the captured CO2 into selected and safe geological bodies, and permanently storing CO2 in deep saline aquifers, exploited or depleted oil and gas fields, deep unmineable coal seams, mined-out areas, shale, basalt layers, shallow seas and other geological bodies through storage mechanisms such as structural storage, residual storage, adsorption storage, dissolution storage and mineralization storage, so as to achieve large-scale carbon removal technology. However, due to the destruction of the original formation stress and the complex and changeable evolution of fractures and seepage laws, CO2 geological storage has a high leakage risk, posing a serious threat to surface plants, animals and humans. Therefore, it is of great safety and environmental protection significance to clarify the CO2 concentration distribution after CO2 geological storage.

[0003] Currently, the commonly used CO2 geological storage leakage monitoring instrument is inserted into the surface soil environment to carry out soil CO2 environment detection, and the change characteristics of CO2 concentration in the surface soil are detected to judge whether there is a shallow CO2 leakage and determine the change of CO2 concentration injected into the shallow soil. For example, the utility model patent with the publication number CN216747019U discloses a carbon dioxide surface leakage monitoring device, but it cannot actively or remotely measure the change of CO2 concentration in the shallow surface soil, and does not have the function of measuring CO2 concentration at multiple layers of the surface and shallow underground. Summary of the Invention

[0004] The technical problem to be solved by the present invention is how to measure the CO2 concentration at multiple layers of the surface and shallow underground.

[0005] To solve the above technical problem, the present invention provides the following technical solution: a CO2 geological storage surface leakage monitoring device, including surface ventilation ends and underground ventilation ends arranged in multiple layers from top to bottom, and also including a test end interface, a test module and a control module; both the surface ventilation end and the underground ventilation end are connected to the test end interface with an on-demand opening function, the test end interface is connected to the test module, and the test module is also connected to the control module.

[0006] Several surface ventilation ends and underground ventilation ends of the present invention are arranged in different stratigraphic environments and their end numbers are determined, enabling the measurement of CO2 concentrations at multiple levels on the surface and in the shallow subsurface. Moreover, the test end interface of the present invention has an on-demand opening function, which can determine the open end ports according to the specific strata to be tested. During the test, only the joint ports of the strata to be tested are opened, and other ports are closed, avoiding interference between different strata to achieve accurate measurement of the CO2 concentration of the strata to be tested.

[0007] Preferably, an air suction unit is included in the test module, and the air suction unit is connected to the test end interface.

[0008] There is an air suction unit in the test module of the present invention, which can form a negative pressure environment. The air suction unit is connected to the test end interface and can absorb the air from the monitored strata of the surface ventilation ends and underground ventilation ports connected through the test end interface.

[0009] Preferably, a communication module and a display module are further included, and both the communication module and the display module are connected to the test module.

[0010] The communication module of the present invention is used to receive or send relevant data, operation instructions, etc., and can accept remote signal control instructions to carry out CO2 gas concentration tests. Workers do not need to frequently go to the site, and can timely obtain and analyze data through the remote control and data transmission functions; the display module can display relevant experimental test parameters such as the end number, end property, and CO2 concentration of the test, and can clearly display data in both strong and weak light environments, facilitating on-site viewing by workers.

[0011] Preferably, a power supply module is further included, and the power supply module is connected to the test module.

[0012] The power supply module of the present invention can supply power to modules such as the test module, test end interface, communication module, control module, and display module.

[0013] Preferably, an external charging module is further included, and the external charging module is connected to the power supply module.

[0014] Preferably, the power supply module, display module, communication module, control module, test module, and test end interface are located inside a housing, and the external charging module, surface ventilation ends, and underground ventilation ends are located outside the housing.

[0015] Preferably, the ports of the surface ventilation ends and underground ventilation ends are externally provided with a breathable, water-proof, and dust-proof membrane.

[0016] The air-permeable, water-blocking and dust-proof film outside the surface ventilation end port of the present invention can isolate surface water and surface dust, facilitating the smooth entry of surface gas into the end. There is also an air-permeable, water-blocking and dust-proof film outside the port of the underground ventilation end, which can isolate shallow groundwater and soil, facilitating the smooth entry of underground gas into the end.

[0017] Preferably, the test module includes an electrochemical sensor or an infrared sensor.

[0018] An installation method of a CO2 geological storage surface leakage monitoring device includes the following steps:

[0019] S1: Excavate a vertical deep groove above the area where CO2 geological storage is to be carried out, and at the same time, excavate multiple horizontal monitoring position trenches at a shallow surface position 0.5 m - 1.5 m underground;

[0020] S2: Arrange the underground ventilation ends in the horizontal monitoring position trenches at the shallow surface position from bottom to top. A water-blocking and dust-proof film is sleeved outside the port of each underground ventilation end, and the underground ventilation ends are numbered from top to bottom;

[0021] S3: Build a protective structure on the surface. Open multiple ventilation holes at a height of 0.5 m - 1.5 m of the structure. Arrange the surface ventilation ends in the ventilation holes from bottom to top. A water-blocking and dust-proof film is sleeved outside the port of each surface ventilation end, and the surface ventilation ends are numbered from bottom to top;

[0022] S4: Connect each underground ventilation end and surface ventilation end to the test end interface located on the surface in sequence according to the coding. The test end interface is connected to the test module. The communication module, control module, display module and power supply module are all connected to the test module, and the external charging module is connected to the power supply module;

[0023] S5: Set the power supply module, display module, communication module, control module, test module and test end interface to be located inside a housing, and the external charging module, surface ventilation end and underground ventilation end are located outside the housing.

[0024] A monitoring method of a CO2 geological storage surface leakage monitoring device. The specific monitoring process is as follows: Set the test time interval and determine each layer position that needs to be tested, and further determine the test end interface corresponding to each layer position. Every time a test time interval passes, the control module controls the opening or closing of each test end interface. During the test, the power supply module supplies power to the test module, test end interface, control module and display module;

[0025] When selecting a certain layer for CO2 concentration testing, the corresponding test end interface is opened, and all other test end interfaces are closed. The suction unit in the test module works to form a negative pressure environment, absorbing the air from the monitored layer of the surface ventilation end or the underground ventilation port connected to the opened test end interface. During the process of absorbing the gas, the test module measures the CO2 gas concentration of this layer. During the test, the display module shows the test end number and the CO2 concentration.

[0026] If it is found that the CO2 concentration of a certain layer is abnormal, the test time interval is shortened, and encrypted monitoring is carried out on this layer.

[0027] Compared with the prior art, the advantages of the present invention are as follows: Through the collaborative work of the underground ventilation end and the surface ventilation end, it is possible to effectively monitor the CO2 concentrations of different depth layers on the surface and in the shallow subsurface, construct a monitoring system from underground to aboveground, comprehensively master the gas distribution in the shallow area of the site, and be able to timely detect the signs of CO2 leakage that may come from deep coal seams. Moreover, the test end interface of the present invention has the function of opening as needed. When selecting a certain layer for testing, only the corresponding test end interface is opened, avoiding interference between different layers and ensuring the accuracy of test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the schematic diagram of the surface leakage monitoring device for carbon dioxide geological storage in Embodiment 1 of the present invention;

[0029] Figure 2 It is the structural schematic diagram of the surface leakage monitoring device for carbon dioxide geological storage in Embodiment 1 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] Embodiment 1

[0032] Combined with Figure 1 and Figure 2 , this embodiment provides a surface leakage monitoring device for CO2 geological storage, including a plurality of surface ventilation ends 202 (U n ,..., U2, U1) arranged from top to bottom in multiple layers and underground ventilation ends 201 (D1, D2, D3,..., D n) The test adapter port 203, the test module 204, the display module 205, the communication module 206, the control module 207, the power supply module 208, and an external charging module 209.

[0033] The display module 205, the communication module 206, the control module 207, the power supply module 208, and the test end interface 203 are all connected to the test module 204. All the surface ventilation ends 202 and the underground ventilation ends 201 are connected to the test end interface 203. The communication module 206, the display module 205, the power supply module 208, the control module 207, the test module 204, and the test end interface 203 are located in a housing 210. The surface ventilation ends 202, the underground ventilation ends 201, and the external charging module 209 are located outside the housing 210. The casing for connecting the underground ventilation end 201 and the test end interface 203 is located in the backfill 211.

[0034] In this embodiment, the surface ventilation end 202 is an end for collecting gas in the surface environment, and the underground ventilation end 201 is an end for collecting gas in the shallow underground environment. The numbers of the surface ventilation ends 202 and the underground ventilation ends 201 are arranged in different layer environments according to the needs of the test horizons. The underground ventilation ends 201 are numbered according to the top-down layer arrangement order, and the surface ventilation ends 201 are numbered according to the bottom-up layer arrangement order. It can realize the measurement of CO2 concentration at multiple horizons on the surface and in the shallow underground. The outside of the port of the surface ventilation port 202 has a breathable, water-proof, and dust-proof membrane, which is used to isolate surface water and surface dust and facilitate the smooth entry of surface gas into the end. The outside of the port of the underground ventilation end 201 also has a breathable, water-proof, and dust-proof membrane, which is used to isolate the shallow underground cement soil and facilitate the smooth entry of underground gas into the end.

[0035] In this embodiment, the test end interface 203 is connected to the test module 204, the surface ventilation end 201, and the underground ventilation end 202. The test end interface 203 has a function of opening as needed, and can determine the open end port according to the specific test horizon. During the test process, only the end interface of the horizon to be tested is opened, and other interfaces are closed.

[0036] The test module 204 is used to test the air at the monitored horizons of the surface ventilation end 202 and the underground ventilation end 201 ports that are connected and opened through the test end interface 203. The test module 204 has a suction unit (not shown in the figure), which can form a negative pressure environment and absorb the air at the monitored horizons of the surface ventilation end and the underground ventilation port connected through the test end interface. The gas absorbed by the suction unit passes through the internal test unit, and the corresponding CO2 gas concentration is tested during the gas absorption process. The internal test unit includes, but is not limited to, an electrochemical sensor, an infrared sensor, and other devices convenient for testing the CO2 gas concentration.

[0037] The display module 205 of this embodiment is used to display relevant experimental parameters such as the end number, end property, and CO2 concentration during the test.

[0038] The communication module 206 of this embodiment is used to receive and send relevant data, operation instructions, etc., and can remotely transmit the test results to a data transmission module (not shown in the figure). The data transmission module has functions such as data display and data storage, and can receive remote signal control instructions to carry out corresponding CO2 gas concentration tests of sensors. The communication module 206 has a USB reading function for easy data transmission.

[0039] The control module 207 of this embodiment is used to receive cloud instructions or on-site operation instructions to carry out corresponding operations such as CO2 gas concentration tests at the test port interface, CO2 gas concentration data transmission at the corresponding layer, and instrument settings.

[0040] The power supply module 208 of this embodiment can supply power to modules such as the test module 204, the test end interface 203, the communication module 206, the control module 207, and the display module 205. The power supply module 208 is equipped with an external charging module 209. The external charging module 209 in this embodiment includes power generation devices such as a solar charging panel and a wind power generation device.

[0041] Embodiment 2

[0042] This embodiment provides an installation method for the above-mentioned CO2 geological sequestration surface leakage monitoring device, including the following steps:

[0043] S1: According to geological exploration and detection requirements, use professional deep exploration equipment to excavate a vertical deep groove above the area where CO2 geological sequestration is to be carried out. In this embodiment, the excavation depth is 5 meters. At the same time, excavate multiple horizontal monitoring position trenches at a shallow surface position of 0.5m - 1.5m underground. In this embodiment, the horizontal monitoring position deep trenches are excavated at intervals of 0.5m. During the excavation process, adopt professional support measures to prevent the trenches from collapsing;

[0044] S2: Arrange the underground ventilation ends from bottom to top in the horizontal monitoring position trenches at the shallow surface position. A water-proof and dust-proof membrane is sleeved outside the ports of each underground ventilation end, and the underground ventilation ends are numbered from top to bottom. In this embodiment, the numbers are D1, D2, and D3. Then, backfill with a mixture of original soil and special reinforcement materials to ensure the stability and good sealing of the ends;

[0045] S3: Build a protective structure on the ground surface. Open multiple ventilation holes at a height of 0.5 m - 1.5 m of the structure. In this embodiment, the ventilation holes are opened at an interval of 0.5 m. Arrange the ground surface ventilation ends from bottom to top in each ventilation hole. A water and dust isolation film is sleeved outside the ports of each ground surface ventilation end, and the ground surface ventilation ends are numbered from bottom to top. In this embodiment, the numbers are U1, U2, and U3.

[0046] S4: Connect each underground ventilation end and ground surface ventilation end to the test end interface located on the ground surface in sequence according to the coding. The test end interface is connected to the test module. The communication module, control module, display module, and power supply module are all connected to the test module. Connect the external charging module (solar charging panel, wind power generation device) to the power supply module. All connection parts are strictly sealed and protected to prevent signal interference and equipment from getting damp.

[0047] S5: Set the power supply module, display module, communication module, control module, test module, and test end interface inside a housing. The external charging module, ground surface ventilation end, and underground ventilation end are located outside the housing.

[0048] Embodiment 3

[0049] This embodiment provides a monitoring method for the above CO2 geological sequestration ground leakage monitoring device. The specific process is as follows:

[0050] Staff set the test time interval through the preset program of the control module every day. In this embodiment, it is 3 hours, and determine each layer position that needs to be tested, and further determine the test end interface corresponding to each layer position. Every time a test time interval passes, the control module controls each test end interface to open or close. During the test, the power supply module supplies power to the test module, test end interface, control module, and display module.

[0051] When selecting a certain layer position for CO2 concentration test, the corresponding test end interface is opened, and all other test end interfaces are closed. The suction unit in the test module works to form a negative pressure environment, and absorbs the air of the monitored layer of the ground surface ventilation end or underground ventilation port connected to the opened test end interface. During the process of absorbing the gas, the test module uses the internal test unit: electrochemical sensor, infrared sensor to test the CO2 gas concentration of this layer. During the test, the display module displays the test end number and CO2 concentration.

[0052] If it is found that the CO2 concentration of a certain layer position appears abnormal, that is, beyond the normal fluctuation range, then shorten the test time interval. In this embodiment, the time interval is shortened to 1 hour, and encrypted monitoring is carried out on this layer position, and the reasons for the concentration change are analyzed in combination with surrounding environmental factors (such as rainfall, farmland irrigation, etc.).

[0053] During the test, the communication module can also use the wireless transmission device dedicated to 4G / 5G networks to continuously maintain the connection with the remote data receiving module, and remotely transmit the test results to the data receiving module in real time. The data receiving module then performs data display and storage.

[0054] Staff can also send remote signal control instructions in the remote monitoring center to make the device conduct CO2 concentration tests using corresponding sensors, and can also adjust the test parameters according to the actual situation. And the staff use the USB reading function of the communication module every week to read the test data within a week to an encrypted mobile hard drive for backup, and at the same time upload it to the cloud server for long-term storage.

[0055] A carbon dioxide geological storage surface leakage monitoring device provided by the present invention can, according to the requirements of active measurement, remote measurement, timing measurement, and measurement at different horizons, through the collaborative work of the underground ventilation end and the surface ventilation end, successfully monitor the CO2 concentration at different depths on the surface and underground, build an effective monitoring system from the surface to the underground, and according to the requirements of active measurement, remote measurement, timing measurement, and measurement at different horizons, and control the end interface to open according to the test end number, comprehensively master the gas distribution in the shallow area of the site, and be able to timely detect the signs of CO2 leakage that may come from deep coal seams; and the test end interface of the present invention has the function of opening on demand, avoiding interference between different horizons and ensuring data accuracy.

[0056] The present invention uses devices such as an air suction pump built into the test device to turn the instrument into a negative pressure environment, efficiently absorb air, and combines a composite test method that combines an infrared absorption sensor and an electrochemistry sensor method to accurately measure the CO2 concentration. After comparing with the data of professional testing institutions many times, the error can be controlled within 3%.

[0057] Through the remote control and data transmission functions of the present invention, data can be obtained and analyzed in a timely manner, and staff do not need to frequently go to the site; the display module can clearly display data in both strong and weak light environments, facilitating on-site staff to view.

[0058] The modular design of the present invention enables only two faulty test end interfaces and one communication module to be replaced during the one-and-a-half-year monitoring process, without replacing the entire device, reducing the maintenance cost. The solar charging panel device can effectively utilize natural energy in the natural environment of the site, reducing the dependence on external power sources and lowering the long-term operation cost.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A CO2 geological sequestration surface leakage monitoring device, characterized in that, It includes surface ventilation ends and underground ventilation ends arranged in multiple layers from top to bottom, and also includes a test end interface, a test module, and a control module; both the surface ventilation ends and the underground ventilation ends are connected to the test end interface with an on-demand opening function, the test end interface is connected to the test module, and the test module is also connected to the control module.

2. The surface leakage monitoring device for CO2 geological storage according to claim 1, characterized in that, The test module includes an air suction unit, and the air suction unit is connected to the test end interface.

3. The surface leakage monitoring device for CO2 geological storage according to claim 1, characterized in that, It also includes a communication module and a display module, and both the communication module and the display module are connected to the test module.

4. The surface leakage monitoring device for CO2 geological storage according to claim 3, characterized in that, It also includes a power supply module, and the power supply module is connected to the test module.

5. The surface leakage monitoring device for CO2 geological storage according to claim 4, characterized in that, It also includes an external charging module, and the external charging module is connected to the power supply module.

6. The surface leakage monitoring device for CO2 geological storage according to claim 5, wherein The power supply module, the display module, the communication module, the control module, the test module, and the test end interface are located inside a housing, and the external charging module, the surface ventilation ends, and the underground ventilation ends are located outside the housing.

7. The surface leakage monitoring device for CO2 geological sequestration according to claim 6, characterized in that, The ports of the surface ventilation ends and the underground ventilation ends are externally provided with a breathable, water-proof, and dust-proof membrane.

8. The surface leakage monitoring device for CO2 geological sequestration according to claim 1, characterized in that, The test module includes an electrochemical sensor or an infrared sensor.

9. The installation method of a CO2 geological storage surface leakage monitoring device according to claims 1-8, characterized in that, It includes the following steps: S1: Excavate a vertical deep groove above the area where CO2 geological sequestration is to be carried out, and at the same time, excavate multiple horizontal monitoring position trenches at a shallow surface position 0.5 m - 1.5 m underground. S2: Arrange the underground ventilation ends from bottom to top in the horizontal monitoring position trenches at the shallow surface position, sleeve a water-proof and dust-proof membrane outside the ports of each underground ventilation end, and number the underground ventilation ends from top to bottom. S3: Build a protective structure on the surface, open multiple ventilation holes at a height of 0.5 m - 1.5 m of the structure, arrange the surface ventilation ends from bottom to top in each ventilation hole, sleeve a water-proof and dust-proof membrane outside the ports of each surface ventilation end, and number the surface ventilation ends from bottom to top. S4: Connect each underground ventilation end and surface ventilation end to the test end interface located on the surface in sequence according to the code, the test end interface is connected to the test module, the communication module, the control module, the display module, and the power supply module are all connected to the test module, and connect the external charging module to the power supply module. S5: Set the power supply module, the display module, the communication module, the control module, the test module, and the test end interface to be located inside a housing, and the external charging module, the surface ventilation ends, and the underground ventilation ends to be located outside the housing.

10. The monitoring method of a CO2 geological sequestration surface leakage monitoring device according to claims 1-8, characterized in that, The specific process of monitoring is as follows: Set the test time interval and determine each layer position that needs to be tested, further determine the test end interface corresponding to each layer position, and every time a test time interval passes, the control module controls each test end interface to open or close. When selecting a certain layer position for CO2 concentration test, the corresponding test end interface opens, and all other test end interfaces close. The air suction unit in the test module works to form a negative pressure environment, absorbs the air of the layer position monitored by the surface ventilation end or the underground ventilation port connected to the opened test end interface. During the process of absorbing the gas, the test module tests the CO2 gas concentration of this layer position. During the test, the display module displays the tested end number and the CO2 concentration. If an abnormal CO2 concentration is detected in a certain layer, shorten the test time interval and conduct encrypted monitoring on this layer; During the test process, the power supply module supplies power to the test module, test end interface, control module, and display module.

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