A carbon dioxide storage monitoring system and a storage monitoring method

Abstract

The present application relates to a carbon dioxide storage monitoring system and a storage monitoring method. The system includes a monitoring chamber, a detection chamber arranged inside the monitoring chamber, an expansion pipe fitting arranged on the outer wall of the monitoring chamber, a rotating frame located inside the detection chamber and rotatably connected to the monitoring chamber, a driver arranged on the monitoring chamber and connected to the rotating frame, an infrared light source located at the central position of the detection chamber, an infrared sensor arranged on the rotating frame, an air inlet located in the sampling area on the outer wall of the monitoring chamber and communicating with the detection chamber, and an exhaust port located in the discharge area on the outer wall of the monitoring chamber and communicating with the detection chamber. The expansion pipe fitting divides the outer wall of the monitoring chamber into a sampling area, a closed area, and a discharge area, and the infrared sensor rotates around the infrared light source. The carbon dioxide storage monitoring system and the storage monitoring method disclosed in the present application directly deploy sensors at the bottom of the well and continuously monitor the gas samples at the bottom of the well, and at the same time use a multi-point monitoring method to detect potential leakage possibilities.

Description

Technical Field

[0001] This application relates to the technical field of carbon dioxide sequestration monitoring, and particularly to a carbon dioxide sequestration monitoring system and a sequestration monitoring method. Background Art

[0002] Carbon dioxide sequestration refers to transporting the captured carbon dioxide to a sequestration site for storage, so as to reduce the amount of carbon dioxide emitted into the atmosphere in life and production. The states of carbon dioxide are gaseous, supercritical, liquid, and solid. Considering the transportation scale and storage, the supercritical state is generally preferred.

[0003] The sequestration methods mainly include three categories: geological sequestration, surface sequestration, and ocean sequestration, which are specifically as follows:

[0004] Geological sequestration: Carbon dioxide is sequestered in a formation. After the carbon dioxide is transported to an appropriate location via a pipeline or vehicle, it is injected into a formation with specific geological conditions and at a specific depth. The proposed geological conditions suitable for carbon dioxide geological sequestration include geological environments such as old oil and gas fields, difficult-to-mine coal seams, and deep groundwater layers.

[0005] Surface sequestration: The basic principle of surface sequestration is to make carbon dioxide chemically react with metal oxides to form solid carbonates and other by-products. The carbonates formed by surface sequestration are also stable solid minerals in nature, which can provide a stable carbon dioxide sequestration effect for a long time.

[0006] Ocean sequestration: The basic principle of ocean sequestration is to utilize the huge volume of the ocean water body and the relatively high solubility of carbon dioxide in the water body to make the ocean a container for sequestering carbon dioxide.

[0007] Among the above three methods, the currently easy-to-implement method is geological sequestration, that is, using the existing underground storage area to store supercritical carbon dioxide. At the same time, a supporting detection method is also required to detect whether leakage occurs.

[0008] The currently main detection methods are seismic wave detection and sensor detection. Seismic wave detection has the potential problem of damaging the underground structure and is difficult to control the intensity; the deployment of sensors is limited by depth, and the data obtained from shallow-depth deployment has a lag. Summary of the Invention

[0009] This application provides a carbon dioxide sequestration monitoring system and a sequestration monitoring method, which directly deploy sensors at the bottom of a well and continuously monitor the gas samples at the bottom of the well, and at the same time use a multi-point monitoring method to detect potential leakage possibilities.

[0010] The above object of this application is achieved through the following technical solutions:

[0011] In a first aspect, the present application provides a carbon dioxide sequestration monitoring system, comprising:

[0012] A monitoring chamber, within which there is a detection cavity;

[0013] An expansion pipe fitting, provided on the outer wall of the monitoring chamber, which divides the outer wall of the monitoring chamber into a sampling area, a closed area, and an emission area;

[0014] A rotating frame, located within the detection cavity and rotatably connected to the monitoring chamber;

[0015] A driver, provided on the monitoring chamber and connected to the rotating frame;

[0016] An infrared light source, located at the central position of the detection cavity;

[0017] An infrared sensor, provided on the rotating frame, and the infrared sensor rotates around the infrared light source;

[0018] An air inlet, located in the sampling area on the outer wall of the monitoring chamber and communicating with the detection cavity;

[0019] An exhaust port, located in the emission area on the outer wall of the monitoring chamber and communicating with the detection cavity.

[0020] In a possible implementation manner of the first aspect, a first gate for opening and closing the air inlet is provided on the monitoring chamber, and the first gate comprises:

[0021] A first sealing ring, slidably connected to the monitoring chamber;

[0022] A first driver, provided on the monitoring chamber and connected to the first sealing ring, and the first driver pushes the first sealing ring to open and close the air inlet.

[0023] In a possible implementation manner of the first aspect, a second gate for opening and closing the exhaust port is provided on the monitoring chamber, and the second gate comprises:

[0024] A second sealing ring, slidably connected to the monitoring chamber;

[0025] A second driver, provided on the monitoring chamber and connected to the second sealing ring, and the second driver pushes the second sealing ring to open and close the exhaust port.

[0026] In a possible implementation manner of the first aspect, a transparent partition ring is provided within the detection cavity, and the transparent partition ring divides the space within the detection cavity into two detection areas and a sample area;

[0027] The sample area is located between the two detection areas;

[0028] The infrared light source and the infrared sensor are respectively located in one detection area;

[0029] Both the air inlet and the air outlet are only connected to the sample area.

[0030] In a possible implementation of the first aspect, an electric heating wire is provided inside the transparent partition ring, and the electric heating wire raises the temperature of the transparent partition ring to remove the moisture on the surface of the transparent partition ring.

[0031] In a possible implementation of the first aspect, it further includes:

[0032] A rotating ring, rotatably connected to the transparent partition ring, and the rotating ring is located between two transparent partition rings;

[0033] Guiding bodies, evenly distributed on the outer side surface of the rotating ring;

[0034] A third driver, provided on the monitoring chamber and connected to the rotating ring, and the third driver is used to drive the connected rotating ring to rotate;

[0035] Wherein, the surface of the transparent partition ring is divided into a detection area and a non-detection area, and the rotating ring is located in the non-detection area;

[0036] The orientation of the distal end of the guiding body is opposite to the rotation direction of the guiding body and faces the detection area.

[0037] In a possible implementation of the first aspect, a channel is provided on the rotating ring, and the channel is located in the detection area.

[0038] In a possible implementation of the first aspect, the guiding bodies are divided into two groups, and the two groups of guiding bodies are respectively located on both sides of the channel;

[0039] The distal ends of the two groups of guiding bodies both face the channel.

[0040] In the second aspect, the present application provides a method for monitoring the sequestration of carbon dioxide, including:

[0041] Opening the air inlet and the air outlet to allow the gas sample below the monitoring chamber to enter the detection cavity;

[0042] Detecting the gas sample in the detection cavity to obtain the carbon dioxide concentration value at the location where the monitoring chamber is located;

[0043] Using the concentration values at the points obtained in the time series to draw a concentration value change curve;

[0044] Representing the concentration value change curves at multiple points in a three-dimensional coordinate map to obtain the regional concentration value change amount of carbon dioxide.

[0045] The beneficial effects of the present application are:

[0046] The carbon dioxide storage monitoring system and storage monitoring method disclosed in this application deploy the storage monitoring system directly at the bottom of the drilling well, continuously monitor the gas samples at the bottom of the drilling well, and deploy a storage monitoring system at the bottom of each drilling well. In this way, multi-point real-time monitoring of the storage area can be carried out. Through the detection data of each point, the change amount of the carbon dioxide concentration in the storage area can be obtained, and potential leakage problems can be discovered. Brief Description of the Drawings

[0047] Figure 1 It is a structural schematic diagram of a storage monitoring system provided by this application.

[0048] Figure 2 It is a schematic diagram of the installation position of a storage monitoring system provided by this application.

[0049] Figure 3 It is a deployment schematic diagram of a storage monitoring system provided by this application relative to the storage area.

[0050] Figure 4 It is a schematic diagram of the division of the area inside the detection chamber provided by this application.

[0051] Figure 5 It is a schematic diagram of the presence of an electric heating wire in a transparent partition ring provided by this application. In the figure, the transparent partition ring is unfolded.

[0052] Figure 6 It is a schematic diagram of the distribution of guides on a rotating ring provided by this application. In the figure, the rotating ring is unfolded.

[0053] Figure 7 It is a schematic diagram of the channels on a rotating ring provided by this application. In the figure, the rotating ring is unfolded.

[0054] Figure 8 It is a curve graph of the change in the concentration value of carbon dioxide obtained by using the storage monitoring system provided by this application.

[0055] Figure 9 It is a schematic diagram of the change amount of the regional concentration value of carbon dioxide obtained according to the curve graph of the concentration value change provided by this application.

[0056] In the figure, 1 is the monitoring chamber, 2 is the expansion pipe fitting, 3 is the rotating frame, 4 is the driver, 5 is the infrared light source, 6 is the infrared sensor, 7 is the first gate, 8 is the second gate, 11 is the detection chamber, 12 is the air inlet, 13 is the exhaust port, 14 is the transparent partition ring, 101 is the sampling area, 102 is the closed area, 103 is the discharge area, 111 is the detection area, 112 is the sample area, 71 is the first sealing ring, 72 is the first driver, 81 is the second sealing ring, 82 is the second driver, 141 is the electric heating wire, 142 is the rotating ring, 143 is the guiding body, 144 is the third driver, 145 is the channel. Detailed implementation mode

[0057] The following further elaborates on the technical solutions in this application in conjunction with the attached drawings.

[0058] This application discloses a carbon dioxide storage monitoring system. In some examples, the carbon dioxide storage monitoring system disclosed in this application consists of a monitoring chamber 1, an expansion pipe fitting 2, a rotating frame 3, a driver 4, an infrared light source 5, and an infrared sensor 6. There is a detection chamber 11 inside the monitoring chamber 1, and both the infrared light source 5 and the infrared sensor 6 are located inside the detection chamber 11.

[0059] Please refer to Figure 1 and Figure 2 , the number of the expansion pipe fittings 2 is two, and both of these two expansion pipe fittings 2 are installed on the outer wall of the monitoring chamber 1. The two expansion pipe fittings 2 divide the outer wall of the monitoring chamber 1 into a sampling area 101, a closed area 102, and a discharge area 103. The air inlet 12 is located in the sampling area 101 on the outer wall of the monitoring chamber 1 and is communicated with the detection chamber 11. The exhaust port 13 is located in the discharge area 103 on the outer wall of the monitoring chamber 1 and is communicated with the detection chamber 11.

[0060] In some possible implementation manners, the air inlets 12 are evenly arranged around the axis of the monitoring chamber 1.

[0061] In some possible implementation manners, the number of the exhaust ports 13 is only one.

[0062] In some possible implementation manners, the expansion pipe fitting 2 is hydraulically driven, and the hydraulic oil is provided by a hydraulic station on the ground.

[0063] Please refer to Figure 2 , the rotating frame 3 is placed inside the detection chamber 11 and is rotatably connected to the monitoring chamber 1. The driver 4 is fixedly installed on the monitoring chamber 1 and is connected to the rotating frame 3. The infrared sensor 6 is installed on the rotating frame 3. When the driver 4 is started, the infrared sensor 6 is driven to rotate around the infrared light source 5 through the rotating frame 3.

[0064] The infrared light source 5 is located at the central position of the detection chamber 11 and does not need to rotate.

[0065] The carbon dioxide sequestration monitoring system disclosed in this application (hereinafter uniformly referred to as the sequestration monitoring system) needs to be installed in a drilling well, which is located above the carbon dioxide sequestration area. The distance between the sequestration monitoring system and the top surface of the carbon dioxide sequestration area is controlled at about 15 - 50 meters, as Figure 3 shown.

[0066] When there is a leakage in the carbon dioxide sequestration area, it will cause the concentration of carbon dioxide in the soil above the carbon dioxide sequestration area to increase. If these escaped carbon dioxides enter the drilling well, they will be captured by the sequestration monitoring system, enter the detection chamber 11 through the air inlet 12, and then leave through the exhaust port 13 after passing through the detection chamber 11.

[0067] That is, this application can provide a continuous detection process. During the detection process, the infrared sensor 6 rotates around the infrared light source 5 to perform detections at various locations in the detection chamber 11, with the aim of obtaining more accurate detection values.

[0068] For example, in a complete detection process, the average value of multiple obtained detection values is calculated.

[0069] In some examples, please refer to Figure 1 , a first gate 7 for opening and closing the air inlet 12 is added to the monitoring chamber 1. The first gate 7 consists of two parts: a first sealing ring 71 and a first driver 72. The first sealing ring 71 is slidably connected to the monitoring chamber 1, and the first driver 72 is installed on the monitoring chamber 1 and connected to the first sealing ring 71. The first driver 72 pushes the first sealing ring 71 to open and close the air inlet 12.

[0070] In some possible implementation manners, the first driver 72 uses an electric cylinder.

[0071] In some examples, please refer to Figure 1 , a second gate 8 for opening and closing the exhaust port 13 is added to the monitoring chamber 1. The second gate 8 consists of two parts: a second sealing ring 81 and a second driver 82. The second sealing ring 81 is slidably connected to the monitoring chamber 1, and the second driver 82 is installed on the monitoring chamber 1 and connected to the second sealing ring 81. The second driver 82 pushes the second sealing ring 81 to open and close the exhaust port 13.

[0072] The functions of the first gate 7 and the second gate 8 are to seal the detection chamber 11. In this way, when detection is not being performed, the detection chamber 11 can be physically isolated from the environment around the monitoring chamber 1 to prevent, for example, moisture from entering the detection chamber 11.

[0073] Please refer to Figure 4, in some examples, a transparent partition ring 14 is added inside the detection chamber 11. The transparent partition ring 14 divides the space inside the detection chamber 11 into two detection regions 111 and a sample region 112, and the sample region 112 is located between the two detection regions 111.

[0074] The infrared light source 5 and the infrared sensor 6 are respectively located in one detection region 111, and the air inlet 12 and the air outlet 13 are both only communicated with the sample region 112.

[0075] By adding the transparent partition ring 14, the infrared light source 5 and the infrared sensor 6 can be enclosed. During the detection process and non-detection process, the infrared light source 5 and the infrared sensor 6 are not in direct contact with the outside world, which can extend the service life of the infrared light source 5 and the infrared sensor 6.

[0076] In some possible implementation manners, please refer to Figure 5 , an electric heating wire 141 is provided inside the transparent partition ring 14. The electric heating wire 141 raises the temperature of the transparent partition ring 14, aiming to remove the moisture on the surface of the transparent partition ring 14. It should be understood that the temperature of the underground environment is low, and the moisture in the surrounding environment may condense or stay on the transparent partition ring 14. At this time, if detection is carried out, the moisture on the transparent partition ring 14 will affect the detection result.

[0077] Therefore, in this application, the electric heating wire 141 is used to raise the temperature of the transparent partition ring 14 and remove the moisture on the surface of the transparent partition ring 14.

[0078] It should also be considered here that during the long-term use process, the transparent partition ring 14 will also have residual dust. The method of heating with the electric heating wire 141 can remove the residual dust to a certain extent, but it cannot guarantee the transparency of the transparent partition ring 14.

[0079] To solve this problem, this application adds a rotating ring 142, a guiding body 143 and a third driver 144. The rotating ring 142 is located between two transparent partition rings 14 and is rotatably connected to the transparent partition ring 14. A rotating ring 142 is installed on each transparent partition ring 14.

[0080] The third driver 144 is installed on the monitoring chamber 1 and is connected to the rotating ring 142. The third driver 144 is used to drive the connected rotating ring 142 to rotate.

[0081] In some possible implementation manners, the third driver 144 uses a motor.

[0082] The guiding bodies 143 are evenly distributed on the outer side surface of the rotating ring 142. In the direction away from the rotating ring 142, the cross-sectional area of the guiding body 143 tends to decrease. Please refer to Figure 6, the proximal end of the guiding body 143 is fixed on the rotating ring 142, and the orientation of the distal end of the guiding body 143 is opposite to the rotation direction of the guiding body 143 and faces the detection area.

[0083] The surface of the transparent partition ring 14 is divided into a detection area and a non-detection area. The rotating ring 142 is located in the non-detection area, and the detection area is provided for the infrared light source 5 and the infrared sensor 6 to use.

[0084] A certain amount of moisture will also remain on the surface of the guiding body 143. When the guiding body 143 rotates at a high speed, this moisture will be thrown onto the detection area, and the impact of the water droplets can remove the dust remaining on the detection area. When the moisture on the guiding body 143 condenses due to temperature, the electric heating wire 141 needs to defrost it in advance.

[0085] In some possible implementation manners, the electric heating wire 141 will perform zone heating. First, heat the detection area. After the moisture on the detection area is removed, then heat the guiding body 143, and then perform the working process of the guiding body 143 as described above.

[0086] In some examples, please refer to Figure 7 , a channel 145 is provided on the rotating ring 142. The channel 145 is located in the detection area. The guiding body 143 is divided into two groups, and the two groups of guiding bodies 143 are respectively located on both sides of the channel 145, and the distal ends of the two groups of guiding bodies 143 both face the channel 145.

[0087] This method deploys the guiding body 143 on both sides of the channel 145 at the same time, and the guiding bodies 143 on both sides clean the detection area at the channel 145 at the same time, and a better cleaning effect can be obtained.

[0088] In the power supply method in the above content, it is generally selected to add a storage battery on the monitoring bin 1. The storage battery is connected to a ground power supply unit (such as solar energy) to supply power to the storage battery regularly. Regarding the control method, a controller (single-chip microcomputer, industrial control computer, programmable logic controller) needs to be added for control. The connection methods of the controller with the driver 4, the infrared light source 5, the infrared sensor 6, the first driver 72, the second driver 82, the electric heating wire 141, and the third driver 144 are all electrical connections.

[0089] The controller consists of a main controller located on the ground and a sub-controller located on the monitoring bin 1. The main controller and the sub-controller can communicate with each other in a wired or wireless manner, which is specifically determined according to the distance.

[0090] For the wiring of the infrared sensor 6, first, the rotating frame 3 extends to the inner transparent partition ring 14. A rotating ring is installed on the inner transparent partition ring 14, and an electric slip ring is deployed inside. The wiring of the infrared sensor 6 passes through the rotating ring and is connected to the electric slip ring, and then extends out of the monitoring bin 1 to transmit data to the outside.

[0091] The present application also discloses a method for monitoring the sequestration of carbon dioxide, and the specific steps are as follows:

[0092] Open the air inlet 12 and the exhaust port 13 to allow the gas sample below the monitoring chamber 1 to enter the detection chamber 11;

[0093] Detect the gas sample in the detection chamber 11 to obtain the carbon dioxide concentration value at the location where the monitoring chamber 1 is located;

[0094] Use the concentration values at the points obtained in the time series to draw a curve of the concentration value change;

[0095] Represent the curves of the concentration value changes at multiple points in a three-dimensional coordinate map to obtain the change amount of the regional concentration value of carbon dioxide.

[0096] The obtained curve of the concentration value change is as Figure 8 shown. Obviously, at the end, there is an obvious change in the concentration of carbon dioxide, indicating that there may be a leakage situation here or nearby. The change amount of the regional concentration value of carbon dioxide is as Figure 9 shown. There is an obvious concentration change in the dotted area in the figure.

[0097] The embodiments of this specific implementation manner are all preferred embodiments of the present application. Without limiting the protection scope of the present application accordingly, therefore: All equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A carbon dioxide storage monitoring system, characterized in that: include: A monitoring chamber (1), wherein a detection chamber (11) is provided inside the monitoring chamber (1); An expansion pipe (2) is arranged on the outer wall of the monitoring chamber (1), and the expansion pipe (2) divides the outer wall of the monitoring chamber (1) into a sampling area (101), a closed area (102) and a discharge area (103); A rotating frame (3) is located in the detection chamber (11) and is rotatably connected to the monitoring chamber (1); A driver (4) is disposed on the monitoring chamber (1) and connected to the rotating frame (3); An infrared light source (5) is located at the center of the detection cavity (11); An infrared sensor (6) is disposed on the rotating frame (3), and the infrared sensor (6) rotates around the infrared light source (5); An air inlet (12) is located in a sampling area (101) on the outer wall of the monitoring chamber (1) and is connected to the detection chamber (11); An exhaust port (13) is located in the exhaust area (103) on the outer wall of the monitoring chamber (1) and is connected to the detection chamber (11); A transparent dividing ring (14) is provided in the detection chamber (11), and the transparent dividing ring (14) divides the space in the detection chamber (11) into two detection areas (111) and a sample area (112); The sample area (112) is located between the two detection areas (111); The infrared light source (5) and the infrared sensor (6) are respectively located in a detection area (111); The air inlet (12) and the air outlet (13) are both connected only to the sample area (112); An electric heating wire (141) is provided inside the transparent separation ring (14), and the electric heating wire (141) increases the temperature of the transparent separation ring (14) to remove moisture on the surface of the transparent separation ring (14); Also includes: A rotating ring (142) is rotatably connected to the transparent separation ring (14), and the rotating ring (142) is located between the two transparent separation rings (14); The guide bodies (143) are evenly distributed on the outer surface of the rotating ring (142); a third driver (144) disposed on the transparent separation ring (14) and connected to the rotating ring (142), the third driver (144) being used to drive the rotating ring (142) connected thereto to rotate; The surface of the transparent separation ring (14) is divided into a detection area and a non-detection area, and the rotating ring (142) is located in the non-detection area; The direction of the distal end of the guide body (143) is opposite to the rotation direction of the guide body (143) and is toward the detection area; A channel (145) is provided on the rotating ring (142), and the channel (145) is located in the detection area; The guide bodies (143) are divided into two groups, and the two groups of guide bodies (143) are respectively located on both sides of the channel (145); The distal ends of the two sets of guide bodies (143) are both directed toward the channel (145).

2. The carbon dioxide storage monitoring system according to claim 1, characterized in that: The monitoring chamber (1) is provided with a first gate (7) for opening and closing the air inlet (12), and the first gate (7) comprises: A first closed ring (71) is slidably connected to the monitoring chamber (1); The first driver (72) is disposed on the monitoring chamber (1) and connected to the first closed ring (71). The first driver (72) pushes the first closed ring (71) to open the air inlet (12) and close the air inlet (12).

3. The carbon dioxide storage monitoring system according to claim 1 or 2, characterized in that: The monitoring chamber (1) is provided with a second gate (8) for opening and closing the exhaust port (13), and the second gate (8) comprises: A second closed ring (81) is slidably connected to the monitoring chamber (1); The second driver (82) is disposed on the monitoring chamber (1) and connected to the second closed ring (81). The second driver (82) pushes the second closed ring (81) to open the exhaust port (13) and close the exhaust port (13).

4. A carbon dioxide storage monitoring method, using the carbon dioxide storage monitoring system according to any one of claims 1 to 3, characterized in that: include: Opening the air inlet (12) and the air outlet (13) to allow the gas sample below the monitoring chamber (1) to enter the detection chamber (11); Detecting the gas sample in the detection chamber (11) to obtain the carbon dioxide concentration value at the point where the monitoring chamber (1) is located; Use the point concentration values ​​obtained in the time series to draw a concentration value change curve; The concentration value change curves of multiple points are represented in a three-dimensional coordinate map to obtain the regional concentration value change of carbon dioxide.

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