Carbon dioxide sequestration monitoring system and sequestration monitoring method

Abstract

The invention relates to a carbon dioxide storage monitoring system and method, and the system comprises a monitoring bin, a detection cavity disposed in the monitoring bin, and an expansion pipe fitting disposed on the outer wall of the monitoring bin. The rotating frame is located in the detection cavity and rotationally connected with the monitoring bin, the driver is arranged on the monitoring bin and connected with the rotating frame, the infrared light source is located in the center of the detection cavity, and the infrared sensor is arranged on the rotating frame. The sampling area is located on the outer wall of the monitoring bin, the air inlet is communicated with the detection cavity, the discharging area is located on the outer wall of the monitoring bin, the air outlet is communicated with the detection cavity, the outer wall of the monitoring bin is divided into the sampling area, the closed area and the discharging area by the expansion pipe fitting, and the infrared sensor rotates around the infrared light source. According to the carbon dioxide sequestration monitoring system and the carbon dioxide sequestration monitoring method disclosed by the invention, the sensor is directly deployed at the bottom of the drilling well and continuously monitors the gas sample at the bottom of the drilling well, and meanwhile, the potential leakage possibility is found by using a multi-point monitoring mode.

Description

Technical Field

[0001] The present application relates to the technical field of carbon dioxide storage monitoring, and in particular to a carbon dioxide storage monitoring system and a carbon dioxide storage monitoring method. Background Art

[0002] Carbon dioxide storage refers to the transportation of captured carbon dioxide to a storage site for storage, which is used to reduce the amount of carbon dioxide emitted into the atmosphere by life and production. Carbon dioxide can be in gaseous, supercritical, liquid, or solid states. Considering the scale of transportation and storage, the supercritical state is generally chosen.

[0003] There are three main types of storage: geological storage, surface storage and marine storage, as follows: Geological storage: Seal carbon dioxide in the ground. After being transported to a suitable location via pipelines or vehicles and ships, carbon dioxide can be injected into the ground with specific geological conditions and a specific depth. The geological conditions suitable for geological storage of carbon dioxide include old oil and gas fields, difficult-to-mine coal seams, deep groundwater layers and other geological environments.

[0004] Surface storage: The basic principle of surface storage is to make carbon dioxide react chemically with metal oxides to form solid carbonates and other byproducts. The carbonates formed by surface storage are also stable solid minerals in nature and can provide stable carbon dioxide storage effects for a long time.

[0005] Ocean storage: The basic principle of ocean storage is to utilize the ocean’s huge water volume and the high solubility of carbon dioxide in water to make the ocean a container for storing carbon dioxide.

[0006] Among the above three methods, the most feasible one is geological storage, which is to use existing underground storage areas to store supercritical carbon dioxide. At the same time, supporting detection methods are also needed to detect whether leakage occurs.

[0007] Currently, the main detection methods include seismic wave detection and sensor detection. Seismic wave detection has the potential to damage underground structures and is difficult to control strength. Sensor deployment is limited by depth, and data obtained from shallow depth deployment has a lag. Summary of the invention

[0008] The present application provides a carbon dioxide storage monitoring system and storage monitoring method, which directly deploys sensors at the bottom of the well and continuously monitors gas samples at the bottom of the well, while using a multi-point monitoring method to detect potential leaks.

[0009] The above-mentioned purpose of the present application is achieved through the following technical solutions: In a first aspect, the present application provides a carbon dioxide storage monitoring system, comprising: A monitoring chamber, wherein a detection cavity is provided inside the monitoring chamber; The expansion pipe is arranged on the outer wall of the monitoring chamber, and the expansion pipe divides the outer wall of the monitoring chamber into a sampling area, a closed area and a discharge area; A rotating frame, located in the detection chamber and rotatably connected to the monitoring chamber; A driver, which is arranged on the monitoring chamber and connected to the rotating frame; An infrared light source is located at the center of the detection cavity; The infrared sensor is arranged on a rotating frame, and the infrared sensor rotates around the infrared light source; An air inlet is located in a sampling area on the outer wall of the monitoring chamber and is connected to the detection cavity; The exhaust port is located in the exhaust area on the outer wall of the monitoring chamber and is connected to the detection cavity.

[0010] In a possible implementation of the first aspect, a first gate for opening and closing the air inlet is provided on the monitoring chamber, and the first gate includes: A first closed loop, slidably connected to the monitoring chamber; The first driver is arranged on the monitoring chamber and connected to the first closed ring. The first driver pushes the first closed ring to open and close the air inlet.

[0011] In a possible implementation of the first aspect, a second gate for opening and closing the exhaust port is provided on the monitoring chamber, and the second gate includes: A second closed ring is slidably connected to the monitoring chamber; The second driver is arranged on the monitoring chamber and connected to the second closed ring. The second driver pushes the second closed ring to open the exhaust port and close the exhaust port.

[0012] In a possible implementation of the first aspect, a transparent separation ring is provided in the detection chamber, and the transparent separation ring divides the space in the detection chamber into two detection areas and a sample area; The sample area is located between the two detection areas; The infrared light source and the infrared sensor are respectively located in a detection area; Both the air inlet and the air outlet are connected to the sample area only.

[0013] In a possible implementation manner of the first aspect, an electric heating wire is provided in the transparent separation ring, and the electric heating wire increases the temperature of the transparent separation ring to remove moisture on the surface of the transparent separation ring.

[0014] In a possible implementation manner of the first aspect, the method further includes: A rotating ring is rotatably connected to the transparent separation ring, and the rotating ring is located between the two transparent separation rings; Guide bodies are evenly distributed on the outer side of the rotating ring; A third driver is provided on the monitoring chamber and connected to the rotating ring, and the third driver is used to drive the rotating ring connected thereto to rotate; The surface of the transparent separation ring is divided into a detection area and a non-detection area, and the rotating ring is located in the non-detection area; The direction of the distal end of the guide body is opposite to the rotation direction of the guide body and faces the detection area.

[0015] In a possible implementation manner of the first aspect, a channel is provided on the rotating ring, and the channel is located in the detection area.

[0016] In a possible implementation of the first aspect, the guide bodies are divided into two groups, and the two groups of guide bodies are respectively located on two sides of the channel; The distal ends of the two sets of guide bodies are both directed toward the channel.

[0017] In a second aspect, the present application provides a method for monitoring the storage of carbon dioxide, comprising: Open the air inlet and the air outlet to allow the gas sample below the monitoring chamber to enter the detection chamber; Detect the gas sample in the detection chamber to obtain the carbon dioxide concentration value at the point where the monitoring chamber 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.

[0018] The beneficial effects of this application are: The carbon dioxide storage monitoring system and storage monitoring method disclosed in the present application deploy the storage monitoring system directly at the bottom of the well to continuously monitor the gas samples at the bottom of the well. A storage monitoring system is deployed at the bottom of each well, so that the storage area can be monitored in real time at multiple points. The change in carbon dioxide concentration in the storage area can be obtained through the detection data of each point, and potential leakage problems can be discovered. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a storage monitoring system provided by this application.

[0020] Figure 2 This is a schematic diagram of the installation location of a storage monitoring system provided in this application.

[0021] Figure 3 This is a schematic diagram of the deployment of a storage monitoring system relative to a storage area provided in this application.

[0022] Figure 4 This is a schematic diagram of the division of the detection cavity area provided by the present application.

[0023] Figure 5 This is a schematic diagram of a transparent separator ring provided by the present application with an electric heating wire, in which the transparent separator ring is expanded.

[0024] Figure 6 This is a schematic diagram of the distribution of guide bodies on a rotating ring provided by the present application, in which the rotating ring is unfolded.

[0025] Figure 7 This is a schematic diagram of a channel on a rotating ring provided in the present application, in which the rotating ring is unfolded.

[0026] Figure 8 This application provides a graph showing changes in carbon dioxide concentration obtained using a storage monitoring system.

[0027] Fig. 9 This application provides a schematic diagram of the regional concentration value change of carbon dioxide obtained according to the concentration value change curve.

[0028] In the figure, 1, monitoring chamber, 2, expansion pipe, 3, rotating frame, 4, driver, 5, infrared light source, 6, infrared sensor, 7, first gate, 8, second gate, 11, detection chamber, 12, air inlet, 13, exhaust port, 14, transparent separation ring, 101, sampling area, 102, closed area, 103, discharge area, 111, detection area, 112, sample area, 71, first closed ring, 72, first driver, 81, second closed ring, 82, second driver, 141, electric heating wire, 142, rotating ring, 143, guide body, 144, third driver, 145, channel. DETAILED DESCRIPTION

[0029] The technical solution in this application is further described in detail below in conjunction with the accompanying drawings.

[0030] The present application discloses a carbon dioxide storage monitoring system. In some examples, the carbon dioxide storage monitoring system disclosed in the present application includes a monitoring chamber 1, an expansion pipe 2, a rotating frame 3, a driver 4, an infrared light source 5 and an infrared sensor 6. There is a detection cavity 11 inside the monitoring chamber 1, and the infrared light source 5 and the infrared sensor 6 are both located inside the detection cavity 11.

[0031] See also Figure 1 and Figure 2There are two expansion pipe fittings 2, both of which 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 connected to 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 connected to the detection chamber 11.

[0032] In some possible implementations, the air inlets 12 are evenly arranged around the axis of the monitoring chamber 1 .

[0033] In some possible implementations, the number of the exhaust port 13 is only one.

[0034] In some possible implementations, the expansion tubular member 2 is driven hydraulically, and the hydraulic oil is provided by a hydraulic station on the ground.

[0035] See also Figure 2 The rotating frame 3 is placed in 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.

[0036] The infrared light source 5 is located at the center of the detection cavity 11 and does not need to be rotated.

[0037] The carbon dioxide storage monitoring system disclosed in this application (hereinafter collectively referred to as the storage monitoring system) needs to be installed in a wellbore, the wellbore is located above the carbon dioxide storage area, and the distance between the storage monitoring system and the top surface of the carbon dioxide storage area is controlled to be about 15-50 meters. Figure 3 shown.

[0038] When a leak occurs in the carbon dioxide storage area, the carbon dioxide concentration in the soil above the carbon dioxide storage area will increase. If the escaped carbon dioxide enters the well, it will be captured by the storage monitoring system, enter the detection chamber 11 through the air inlet 12, and then leave the exhaust port 13 through the detection chamber 11.

[0039] That is, the present application can provide a continuous detection process, during which the infrared sensor 6 rotates around the infrared light source 5 and performs detection at various locations in the detection cavity 11, in order to obtain more accurate detection values.

[0040] For example, in a complete detection process, the average of multiple detection values ​​obtained is calculated.

[0041] For some examples, see Figure 1A first gate 7 for opening and closing the air inlet 12 is added to the monitoring chamber 1. The first gate 7 consists of a first closing ring 71 and a first driver 72. The first closing ring 71 is slidably connected to the monitoring chamber 1. The first driver 72 is installed on the monitoring chamber 1 and connected to the first closing ring 71. The first driver 72 pushes the first closing ring 71 to open and close the air inlet 12.

[0042] In some possible implementations, the first driver 72 uses an electric cylinder.

[0043] For some examples see 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 a second closed ring 81 and a second driver 82. The second closed ring 81 is slidably connected to the monitoring chamber 1. The second driver 82 is installed 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 and close the exhaust port 13.

[0044] The first gate 7 and the second gate 8 are used to seal the detection chamber 11 , so that when no detection is performed, the detection chamber 11 can be physically isolated from the environment around the monitoring chamber 1 to prevent moisture, etc. from entering the detection chamber 11 .

[0045] See also Figure 4 In some examples, a transparent separation ring 14 is added to the detection chamber 11 , and the transparent separation ring 14 divides the space in the detection chamber 11 into two detection areas 111 and a sample area 112 , and the sample area 112 is located between the two detection areas 111 .

[0046] The infrared light source 5 and the infrared sensor 6 are respectively located in a detection area 111 , and the air inlet 12 and the air outlet 13 are both connected only to the sample area 112 .

[0047] The infrared light source 5 and the infrared sensor 6 can be sealed by adding a transparent separation ring 14. During the detection process and the 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.

[0048] For some possible implementations, see Figure 5 The transparent separation ring 14 is provided with an electric heating wire 141, which increases the temperature of the transparent separation ring 14 to remove moisture on the surface of the transparent separation ring 14. It should be understood that the temperature of the underground environment is low, and moisture in the surrounding environment may condense or remain on the transparent separation ring 14. At this time, if a test is performed, the moisture on the transparent separation ring 14 will affect the test result.

[0049] Therefore, in the present application, an electric heating wire 141 is used to increase the temperature of the transparent separation ring 14 and remove moisture on the surface of the transparent separation ring 14 .

[0050] It should also be considered that during long-term use, dust will remain on the transparent separator ring 14 . The heating method using the electric heating wire 141 can remove the residual dust to a certain extent, but the transparency of the transparent separator ring 14 cannot be guaranteed.

[0051] In order to solve this problem, the present application adds a rotating ring 142 , a guide body 143 and a third driver 144 . The rotating ring 142 is located between the two transparent separation rings 14 and is rotatably connected to the transparent separation rings 14 . A rotating ring 142 is installed on each transparent separation ring 14 .

[0052] The third driver 144 is installed on the monitoring chamber 1 and connected to the rotating ring 142. The third driver 144 is used to drive the rotating ring 142 connected thereto to rotate.

[0053] In some possible implementations, the third driver 144 uses a motor.

[0054] The guide bodies 143 are evenly distributed on the outer surface of the rotating ring 142, and the cross-sectional area of ​​the guide bodies 143 tends to decrease in the direction away from the rotating ring 142. Figure 6 The proximal end of the guide body 143 is fixed on the rotating ring 142, and the distal end of the guide body 143 is oriented opposite to the rotation direction of the guide body 143 and toward the detection area.

[0055] The surface of the transparent separation 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 use by the infrared light source 5 and the infrared sensor 6.

[0056] A certain amount of water will also remain on the surface of the guide body 143. When the guide body 143 rotates at high speed, the water will be thrown to the detection area, and the impact of water droplets can remove dust trapped in the detection area. When the water on the guide body 143 condenses due to temperature, the electric heating wire 141 needs to be thawed in advance.

[0057] In some possible implementations, the electric heating wire 141 performs zone heating, first heating the detection zone, and then heating the guide body 143 after the moisture on the detection zone is removed, and then the above-mentioned working process of the guide body 143 is performed.

[0058] For some examples, see Figure 7 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 , and the distal ends of the two groups of guide bodies 143 are both facing the channel 145 .

[0059] In this manner, guide bodies 143 are deployed on both sides of the channel 145 at the same time, and the guide bodies 143 on both sides clean the detection area at the channel 145 at the same time, which can achieve a better cleaning effect.

[0060] In the above content, the power supply method generally chooses to add a battery to the monitoring cabin 1, and the battery is connected to the ground power supply unit (such as solar energy) to supply power to the battery regularly. Regarding the control method, it is necessary to add a controller (single-chip microcomputer, industrial computer, programmable logic controller) for control. The connection method between the controller and the driver 4, infrared light source 5, infrared sensor 6, first driver 72, second driver 82, electric heating wire 141 and third driver 144 are all electrical connections.

[0061] The controller consists of two parts: a main controller located on the ground and a sub-controller located on the monitoring cabin 1. The main controller and the sub-controller can communicate with each other by wire or wireless, depending on the distance.

[0062] The wiring of the infrared sensor 6 first extends from the rotating frame 3 to the transparent separation ring 14 located on the inner side. A rotating ring is installed on the inner transparent separation 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 from the monitoring chamber 1 to transmit data to the outside.

[0063] The present application also discloses a carbon dioxide storage monitoring method, the specific steps of which are as follows: Open 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; Detect 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.

[0064] The concentration change curve obtained is as follows Figure 8 As shown in the figure, it is obvious that the concentration of carbon dioxide has changed significantly at the end, indicating that there may be a leak here or nearby. The change in the regional concentration value of carbon dioxide is shown in Fig. 9 As shown, there is an obvious concentration change in the dotted area in the figure.

[0065] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in 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); The 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).

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. The carbon dioxide storage monitoring system according to claim 1, characterized in that: 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).

5. The carbon dioxide storage monitoring system according to claim 4, characterized in that: An electric heating wire (141) is arranged 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).

6. The carbon dioxide storage monitoring system according to claim 4, characterized in that: 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 directed toward the detection area.

7. The carbon dioxide storage monitoring system according to claim 6, characterized in that: The rotating ring (142) is provided with a channel (145), and the channel (145) is located in the detection area.

8. The carbon dioxide storage monitoring system according to claim 7, characterized in that: 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).

9. A method for monitoring the storage of carbon dioxide, 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.

Images