A carbon dioxide geological storage test well mouth sealing device

Abstract

The application discloses a kind of carbon dioxide geological storage test well mouth sealing devices, including linearly sequentially arranged in the multiple-stage sealing structure of mine inside, each stage sealing structure includes annular positioning assembly and one-way air inlet component with mine inner wall sealing positioning connection, annular positioning assembly includes annular sealing plate, the center of annular sealing plate is provided with air inlet hole;One-way air inlet component includes the arc-shaped sealing shell of the position corresponding air inlet hole and is slidably arranged on annular sealing plate, the opening end of arc-shaped sealing shell is towards the direction of mine inside, the outer diameter of arc-shaped sealing shell is greater than the aperture of air inlet hole;Arc-shaped sealing shell slides towards the direction away from or close to air inlet hole.The carbon dioxide geological storage test well mouth sealing device of the above structure is used in the application, by setting multiple-stage sealing structure, after injection is completed, arc-shaped sealing shell is sealed to air inlet hole using gas pressure, to realize well mouth sealing.

Description

Technical Field

[0001] This invention relates to the field of carbon sequestration technology, and in particular to a wellhead sealing device for carbon dioxide geological sequestration experiments. Background Technology

[0002] Resources are the driving force of development, but the reserves of some resources on Earth are finite; these resources are called non-renewable resources. Current non-renewable energy sources are mainly fossil fuels. The use of fossil fuels emits large amounts of carbon dioxide, and with the progress of social development, carbon dioxide emissions continue to increase, thus exacerbating the greenhouse effect.

[0003] To address these issues, existing research primarily focuses on carbon dioxide sequestration. Specifically, carbon dioxide geological sequestration refers to the technology of capturing carbon dioxide generated during the production processes of large-scale emission source enterprises and injecting it into deep geological reservoirs for storage, thereby achieving long-term isolation of carbon dioxide from the atmosphere. This is one of the key technologies for addressing global climate change.

[0004] Currently, artificial carbon dioxide sequestration primarily takes place in the ocean and underground. While the ocean holds immense potential for carbon dioxide processing, the complexity of marine ecosystems makes it difficult to accurately estimate the impact of large-scale carbon dioxide injection on them. Therefore, geological sequestration, which is easier to control, has become the primary method. Within geological sequestration, some researchers have proposed utilizing large numbers of depleted and abandoned mines to store carbon dioxide. While this method achieves resource reuse, the poor sealing of the wellheads could lead to carbon dioxide leakage. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a sealing device for a carbon dioxide geological storage test wellhead. By setting up a multi-stage sealing structure, the arc-shaped sealing shell can be sealed onto the air inlet using gas pressure after injection, thereby achieving wellhead sealing.

[0006] To achieve the above objectives, the present invention provides a sealing device for a carbon dioxide geological storage test wellhead, comprising a multi-stage sealing structure arranged linearly inside the mine. Each stage of the sealing structure includes an annular positioning component and a one-way air intake component that are sealed and positioned to the inner wall of the mine. The annular positioning component includes an annular sealing plate with an air intake hole at its center.

[0007] The one-way air intake assembly includes an arc-shaped sealing shell that is slidably disposed on an annular sealing plate at the position corresponding to the air intake hole. The opening end of the arc-shaped sealing shell faces the inside of the mine, and the outer diameter of the arc-shaped sealing shell is larger than the diameter of the air intake hole.

[0008] The arc-shaped sealing shell slides in a direction away from or towards the air inlet.

[0009] Preferably, the blind end of the arc-shaped sealing shell is slidably connected to the annular sealing plate via multiple guide posts. The end of the guide post extends out of the arc-shaped sealing shell and is connected to an anti-detachment head. The other end of the guide post passes through the annular sealing plate, and a tension spring is connected to the end of the guide post that passes through the annular sealing plate.

[0010] The radius of the circle formed by the multiple guide pillars is larger than the diameter of the air intake.

[0011] Preferably, the blind end of the arc-shaped sealing shell formed by multiple guide posts is bonded with an elastic sealing layer, the material of which is elastic resin.

[0012] Preferably, the arc-shaped sealing shell is connected to the inner wall of the mine via a walking assembly. The walking assembly includes multiple opening and closing walking components evenly arranged in a circle on the outer wall of the arc-shaped sealing shell. Each opening and closing walking component includes a walking leg that is vertically rotatably mounted on the outer wall of the arc-shaped sealing shell at one end, a walking wheel that is rotatably mounted on the other end of the walking leg, and an opening and closing electric push rod for driving the walking leg to open and close. A hub motor is provided on the walking wheel.

[0013] One end of the electric push rod is vertically rotatably mounted on the arc-shaped sealing shell, and the other end is vertically rotatably connected to the end of the walking leg near the arc-shaped sealing shell.

[0014] Preferably, a shock-absorbing spring is also provided between the traveling wheel and the traveling outrigger.

[0015] Preferably, an annular sealing airbag is fixed to the outer ring side of the annular sealing plate. The annular sealing airbag is connected to the air pump via an air inlet pipe. A first pressure sensor is installed on the air inlet pipe. The first pressure sensor is electrically connected to the air pump via a controller.

[0016] Preferably, the annular sealing airbags of adjacent two-stage sealing structures are connected by an air inlet pipe.

[0017] Preferably, the annular sealing plates of adjacent two-stage sealing structures are softly connected.

[0018] Preferably, the annular sealing plates of adjacent two-stage sealing structures are connected by a connecting rope.

[0019] Preferably, a second pressure sensor is also installed inside the mine between the two adjacent sealing structures. The second pressure sensor communicates with the alarm and alarm terminal.

[0020] The present invention has the following beneficial effects:

[0021] 1. By setting up a multi-stage sealing structure, the arc-shaped sealing shell can be sealed to the air inlet by gas pressure after injection, thereby achieving wellhead sealing.

[0022] 2. By setting a first pressure sensor, the sealing status between the annular sealing plate and the inner wall of the mine can be detected. At the same time, by setting a second pressure sensor, the overall sealing status of the sealing structure can be detected, thereby achieving reliable sealing.

[0023] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a diagram showing the state of a carbon dioxide geological storage test wellhead sealing device during carbon dioxide injection according to the present invention;

[0025] Figure 2 This is a diagram showing the completed injection state of a carbon dioxide geological storage test wellhead sealing device according to the present invention.

[0026] Figure 3 for Figure 2 Enlarged view of point A in the image.

[0027] The components are: 1. Mine shaft; 2. Sealing structure; 21. Annular positioning assembly; 211. Annular sealing plate; 212. Annular sealing airbag; 213. Air inlet; 22. One-way air inlet assembly; 221. Tension spring; 222. Guide column; 223. Arc-shaped sealing shell; 224. Opening and closing electric push rod; 225. Traveling legs; 226. Traveling wheels; 23. Connecting rope. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages disclosed in the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments of the present invention and are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0029] It should be noted that the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or server that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0030] Similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0032] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] like Figures 1-3 As shown, a carbon dioxide geological storage test wellhead sealing device includes a multi-stage sealing structure 2 arranged linearly inside a mine 1. Each sealing structure 2 includes an annular positioning component 21 and a one-way air intake component 22 that are sealed and positioned to the inner wall of the mine 1. The annular positioning component 21 includes an annular sealing plate 211, with an air intake hole 213 at its center. The one-way air intake component 22 includes an arc-shaped sealing shell 223 that is slidably disposed on the annular sealing plate 211 at a position corresponding to the air intake hole 213. The opening end of the arc-shaped sealing shell 223 faces the inside of the mine 1, and the outer diameter of the arc-shaped sealing shell 223 is larger than the diameter of the air intake hole 213. The arc-shaped sealing shell 223 slides in a direction away from or close to the air intake hole 213.

[0034] The blind end of the arc-shaped sealing shell 223 is slidably connected to the annular sealing plate 211 via multiple guide posts 222. The end of the guide post 222 passes through the arc-shaped sealing shell 223 and is connected to an anti-detachment head. The other end of the guide post 222 passes through the annular sealing plate 211, and a tension spring 221 is connected to the end of the guide post 222 that passes through the annular sealing plate 211. The radius of the circle formed by the multiple guide posts 222 is larger than the diameter of the air inlet 213. The tension spring 221 can quickly rebound after the carbon dioxide injection is completed, so that the annular sealing plate 211 can quickly seal onto the air inlet 213, minimizing the escape of carbon dioxide.

[0035] The blind end of the arc-shaped sealing shell 223 formed by multiple guide posts 222 is bonded with an elastic sealing layer. The elastic sealing layer is made of elastic resin, which enhances the sealing performance.

[0036] The arc-shaped sealing shell 223 is rolledly connected to the inner wall of the mine 1 via a walking assembly. The walking assembly includes multiple opening and closing walking components evenly arranged circumferentially on the outer wall of the arc-shaped sealing shell 223. Each opening and closing walking component includes a walking leg 225 with one end vertically rotatably mounted on the outer wall of the arc-shaped sealing shell 223, a walking wheel 226 rotatably mounted on the other end of the walking leg 225, and an opening and closing electric push rod 224 for driving the walking leg 225 to open and close. A hub motor is installed on the walking wheel 226. One end of the opening and closing electric push rod 224 is vertically rotatably mounted on the arc-shaped sealing shell 223, and the other end is vertically rotatably connected to the end of the walking leg 225 near the arc-shaped sealing shell 223. A vibration damping spring is also provided between the walking wheel 226 and the walking leg 225. After the sealing structure 2 is placed inside the mine 1, the opening and closing electric push rod 224 can be used to open the walking leg 225, and at the same time, in conjunction with the hub motor, the sealing structure 2 can move autonomously inside the mine 1.

[0037] An annular sealing airbag 212 is fixed to the outer ring side of the annular sealing plate 211. The outer circumference of the annular sealing airbag 212 is in close contact with the inner wall of the mine 1. The annular sealing airbag 212 is connected to the air pump through the air inlet pipe. A first pressure sensor is installed on the air inlet pipe. The first pressure sensor is electrically connected to the air pump through the controller. When the pressure of the annular sealing airbag 212 collected by the first pressure sensor is less than the set lower limit pressure (the annular sealing airbag 212 is leaking air, and the sealing between the annular sealing airbag 212 and the mine 1 is reduced), the air pump is turned on, and the annular sealing airbag 212 is inflated by the air pump and the air inlet pipe until the pressure value collected by the first pressure sensor reaches the set upper limit pressure value, and then the air pump is turned off.

[0038] The annular sealing airbags 212 of adjacent two-stage sealing structures 2 are connected by an air inlet pipe, so that multiple annular sealing airbags 212 can be inflated simultaneously by using the air inlet pipe.

[0039] The annular sealing plates 211 of adjacent two-stage sealing structures 2 are softly connected. Preferably, the annular sealing plates 211 of adjacent two-stage sealing structures 2 are connected by connecting ropes 23, and multiple sealing structures 2 are hoisted together into the mine shaft 1.

[0040] A second pressure sensor is also installed inside the mine shaft 1 between the two adjacent sealing structures 2. The second pressure sensor communicates with the alarm and alarm terminal. When carbon dioxide escapes from the mine shaft 1 to the outside of the sealing structure 2, the pressure collected by the second pressure sensor increases, and the on-site alarm and alarm terminal are used to sound an alarm. It should also be noted that in this embodiment, the location of the escape can also be indicated by the location of the second pressure sensor. For example, if the pressure collected by the second pressure sensor between the innermost sealing structure 2 and the second-to-last sealing structure 2 increases, it means that the sealing effect of the innermost sealing structure 2 has deteriorated. At this time, the value collected by the first pressure sensor is checked. If the value collected by the first pressure sensor is within the set range, there may be damage to the device, and the staff should be reminded to repair it.

[0041] Working principle: First, the multi-stage sealing structure 2 is hoisted into the mine shaft 1. The opening and closing electric push rod 224 is opened, causing the outriggers 225 to open, which in turn causes the wheels 226 to contact the inner wall of the mine shaft 1. The opening and closing electric push rod 224 is closed, and the hub motor is turned on. The hub motor drives the multi-stage sealing structure 2 to move along the mine shaft 1 until a set distance is reached (a remote camera can also be mounted on the sealing structure 2 to observe a relatively smooth area inside the mine shaft 1, determining this as the installation position of the sealing structure 2). The hub motor is then turned off, and finally, the piston rod of the opening and closing electric push rod 224 is controlled to retract, straight... Once the traveling wheel 226 is no longer in contact with the mine shaft 1, an injection pipe is inserted into the mine shaft 1 to inject carbon dioxide into it. Under the propulsion of the carbon dioxide gas, the arc-shaped sealing shell 223 is pushed away from the air inlet 213, forming an air intake channel between the arc-shaped sealing shell 223 and the air inlet 213. The carbon dioxide enters the mine shaft 1 through the air intake channel until the injection is complete. Then, the injection pipe is pulled out, and the carbon dioxide inside the mine shaft 1 pushes the arc-shaped sealing shell 223 towards the air inlet 213, thus sealing the mine shaft 1.

[0042] Therefore, the carbon dioxide geological storage test wellhead sealing device of the present invention adopts the above-mentioned structure. By setting up a multi-stage sealing structure, the arc-shaped sealing shell can be sealed to the air inlet by gas pressure after injection, thereby achieving wellhead sealing.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A sealing device for a carbon dioxide geological storage test wellhead, characterized in that: It includes a multi-stage sealing structure arranged linearly inside the mine. Each stage of the sealing structure includes an annular positioning component and a one-way air intake component that are sealed and positioned to the inner wall of the mine. The annular positioning component includes an annular sealing plate with an air intake hole at the center. The one-way air intake assembly includes an arc-shaped sealing shell that is slidably disposed on an annular sealing plate at the position corresponding to the air intake hole. The opening end of the arc-shaped sealing shell faces the inside of the mine, and the outer diameter of the arc-shaped sealing shell is larger than the diameter of the air intake hole. The arc-shaped sealing shell slides in a direction away from or towards the air inlet; The blind end of the arc-shaped sealing shell is slidably connected to the annular sealing plate via multiple guide posts. The end of the guide post passes through the arc-shaped sealing shell and is connected to an anti-detachment head. The other end of the guide post passes through the annular sealing plate, and a tension spring is connected to the end of the guide post that passes through the annular sealing plate. The radius of the circle formed by the multiple guide pillars is larger than the diameter of the air intake hole; The arc-shaped sealing shell is connected to the inner wall of the mine by a rolling assembly. The rolling assembly includes multiple opening and closing rolling components evenly arranged on the outer wall of the arc-shaped sealing shell. Each opening and closing rolling component includes a rolling leg that is vertically rotatably mounted on the outer wall of the arc-shaped sealing shell, a rolling wheel that is rotatably mounted on the other end of the rolling leg, and an opening and closing electric push rod for driving the rolling leg to open and close. A hub motor is provided on the rolling wheel. One end of the electric push rod is vertically rotatably mounted on the arc-shaped sealing shell, and the other end is vertically rotatably connected to the end of the walking leg near the arc-shaped sealing shell. An annular sealing airbag is fixed on the outer ring side of the annular sealing plate. The annular sealing airbag is connected to the air pump through the air inlet pipe. A first pressure sensor is installed on the air inlet pipe. The first pressure sensor is electrically connected to the air pump through the controller. The annular sealing airbags of adjacent two-stage sealing structures are connected by an air inlet pipe; The annular sealing plates of adjacent two-stage sealing structures are softly connected. A second pressure sensor is also installed inside the mine between the two adjacent sealing structures. The second pressure sensor communicates with the alarm and alarm terminal.

2. The carbon dioxide geological storage test wellhead sealing device according to claim 1, characterized in that: The blind end of the arc-shaped sealing shell formed by multiple guide pillars is bonded with an elastic sealing layer, which is made of elastic resin.

3. The carbon dioxide geological storage test wellhead sealing device according to claim 1, characterized in that: A shock-absorbing spring is also installed between the traveling wheels and the traveling legs.

4. The carbon dioxide geological storage test wellhead sealing device according to claim 1, characterized in that: The annular sealing plates of adjacent sealing structures are connected by a connecting rope.

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