An underground carbon dioxide injection device

Abstract

The present invention discloses a carbon dioxide underground injection device, which includes multiple injection mechanisms arranged on the ground and a multi-section self-sealing centering injection well communicated with the output ends of the multiple injection mechanisms. The injection well is composed of multiple sections of centering fiberglass pipes successively extending into the drilling well, and a sealing structure is arranged between adjacent two sections of centering fiberglass pipes; concrete slurry is poured between the fiberglass pipe and the inner wall of the drilling well. By using the carbon dioxide underground injection device with the above structure, the centering fiberglass pipe driving the sealing structure is used to replace the traditional cast iron pipe, greatly improving the corrosion resistance and sealing performance, and contributing to the efficient injection of carbon dioxide into the saline aquifer.

Description

Technical Field

[0001] The present invention relates to the field of carbon dioxide sequestration, and particularly to an underground carbon dioxide injection device. Background Art

[0002] The increase in the content of greenhouse gases such as CO2 in the atmosphere is one of the important reasons for global warming and frequent climate disasters. To achieve "carbon peak" and "carbon neutrality" as soon as possible, on the one hand, it is necessary to continuously reduce the use of fossil energy and vigorously develop renewable energy such as solar energy and wind energy. On the other hand, it is necessary to promote the implementation of CCS (Carbon Capture and Storage) technology.

[0003] Among them, the steps of carbon capture and storage are as follows:

[0004] 1. Carbon capture (Capture): That is, carbon dioxide capture (Carbon Dioxide Capture, CDC), which is a key step in carbon capture and storage (CCS) technology. The main purpose is to separate and capture carbon dioxide (CO2) from industrial emission sources or the atmosphere.

[0005] 2. Inject the captured carbon dioxide underground for storage: Use an injection well to inject the captured carbon dioxide into the underground saline aquifer.

[0006] The existing injection wells have the following defects:

[0007] 1. It is easily corroded by the salt water in the saline aquifer, reducing the service life.

[0008] 2. The sealing effect between two adjacent saline aquifers is poor, and the carbon dioxide in the injection well is easily spilled from the joints, affecting the underground environment.

[0009] 3. The centering effect of multiple saline aquifers is poor, resulting in obstruction of carbon dioxide filling.

[0010] 4. Most are single-channel injections and do not support multi-channel simultaneous injections, reducing the injection efficiency. Summary of the Invention

[0011] To solve the above problems, the present invention provides an underground carbon dioxide injection device. By using a centering fiberglass pipe with a driving sealing structure to replace the traditional cast iron pipe, the corrosion resistance and sealing performance are greatly improved, which helps to efficiently inject carbon dioxide into the saline aquifer.

[0012] To achieve the above-mentioned object, the present invention provides a carbon dioxide underground injection device, comprising a multi-port injection mechanism arranged on the ground, and a multi-section self-sealing centering injection well connected to the output end of the multi-port injection mechanism, the injection well is composed of a multi-section centering glass fiber reinforced plastic pipe sequentially extending into the wellbore, and a sealing structure is arranged between the centering glass fiber reinforced plastic pipes at two adjacent ends;

[0013] Concrete slurry is poured between the FRP pipe and the inner wall of the well.

[0014] Preferably, the sealing structure includes an insertion ring fixed to one end of the centering glass fiber reinforced plastic pipe, an annular insertion groove opened at the other end of the centering glass fiber reinforced plastic pipe, and a multi-layer sealing protrusion arranged on the inner wall of the annular insertion groove, and the sealing protrusion is a flexible resin;

[0015] Two adjacent sections of the centering glass fiber reinforced plastic pipes are plugged in sequentially through the inserting ring and the annular inserting groove, and are sealed and connected through the sealing protrusion.

[0016] Preferably, the flexible resin has a porous structure.

[0017] Preferably, the centering FRP pipe comprises a FRP pipe body and a plurality of centering components evenly arranged around the circumference of the FRP pipe body, the centering components comprising an inner air cavity fixed at one end to the outer circumference of the FRP pipe body and an outer air cavity fixed at the other end of the inner air cavity, the outer air cavity being slidably arranged inside the inner air cavity;

[0018] The inner air cavity and the outer air cavity of two adjacent centering components are connected in an alternating manner via a hose.

[0019] Preferably, a side of the outer air cavity facing away from the inner air cavity is vertically rotatably connected with a guide wheel, and the guide wheel fits against the inner wall of the drill hole.

[0020] Preferably, the multi-port injection mechanism includes a plurality of injection units arranged around the injection well, each injection unit includes an injection pipe and a pressure pump arranged on the injection pipe, one end of the injection pipe is provided with a quick connector, and the other end is connected to the circumferential side of the injection well, and a one-way flow component is provided between the pressure pump and the injection well.

[0021] Preferably, the one-way flow assembly comprises an annular blocking ring fixed on the inner wall of the injection pipe, a flow hole formed on the annular blocking ring, and a blocking ball aligned with the flow hole and arranged inside the injection pipe, wherein the blocking ball and the annular blocking ring are sequentially arranged inside the injection pipe along the direction of carbon dioxide injection;

[0022] The blocking ball is also connected to the inner wall of the injection tube via a return spring, and a movement margin is left between the blocking ball and the inner wall of the injection tube.

[0023] The present invention has the following beneficial effects:

[0024] 1. By using a centered glass steel pipe with a driving seal structure to replace the traditional cast iron pipe, the corrosion resistance and sealing performance are greatly improved, which helps to efficiently inject carbon dioxide into the saline aquifer.

[0025] 2. By setting up a multi-port injection mechanism, carbon dioxide can be injected into the injection well through multiple injection pipes simultaneously without affecting each other, thus improving the carbon dioxide injection efficiency.

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0027] Figure 1 It is a radial cross-sectional view of an injection well of a carbon dioxide underground injection device of the present invention;

[0028] Figure 2 It is an arrangement diagram of injection pipes of a carbon dioxide underground injection device of the present invention;

[0029] Figure 3 It is an axial cross-sectional view of an injection well of a carbon dioxide underground injection device of the present invention.

[0030] Wherein: 1. Injection well; 2. Inner air cavity; 3. Guide wheel; 4. Outer air cavity; 5. Hose; 6. Injection pipe; 7. Blocking ball; 8. Ring-shaped blocking ring; 9. Return spring; 10. Insertion ring; 11. Ring-shaped insertion groove; 12. Sealing protrusion. Detailed Embodiments

[0031] In order to make the purpose, technical solution and advantages of 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 embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application. The 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.

[0032] It should be noted that the terms "include" and "have" 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 does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0033] Like reference numerals and letters refer to like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0035] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] As Figures 1 - 3 shown, a carbon dioxide underground injection device includes a plurality of injection mechanisms arranged on the ground and a multi-stage self-sealing centering injection well 1 communicated with the output ends of the plurality of injection mechanisms. The injection well 1 is composed of a plurality of centering glass steel pipes extending into the drilling well in sequence, and a sealing structure is arranged between adjacent two ends of the centering glass steel pipes; a concrete slurry is poured between the glass steel pipe and the inner wall of the drilling well.

[0037] Specifically, the sealing structure includes an insertion ring 10 fixed at one end of the centering glass steel pipe, an annular insertion groove 11 opened at the other end of the centering glass steel pipe, and a plurality of layers of sealing protrusions 12 arranged on the inner wall of the annular insertion groove 11. The sealing protrusions 12 are flexible resins; adjacent two sections of centering glass steel pipes are sequentially inserted through the insertion ring 10 and the annular insertion groove 11, and are hermetically connected through the sealing protrusions 12. In this embodiment, a plurality of layers of sealing protrusions 12 are arranged on both the inner ring side and the outer ring side of the insertion groove. When the insertion ring 10 of the top centering glass steel pipe is inserted into the annular insertion groove 11 of the bottom centering glass steel pipe, the insertion ring 10 can be sealed by means of the sealing protrusions 12. The insertion ring 10 in this embodiment is integrally formed with the centering glass steel pipe.

[0038] The flexible resin has a porous structure, which is beneficial to improving the elasticity of the flexible resin, thereby improving the sealing performance.

[0039] The centering FRP pipe includes a FRP pipe body and a plurality of centering components evenly arranged around the circumference of the FRP pipe body, the centering component includes an inner air cavity 2 fixed at one end to the outer circumference of the FRP pipe body and an outer air cavity 4 fixed at the other end of the inner air cavity 2, the outer air cavity 4 is slidably arranged inside the inner air cavity 2; the inner air cavity 2 and the outer air cavity 4 of two adjacent centering components are interconnected via a hose 5, and the centering principle is as follows: when the FRP pipe body is tilted toward one of the centering components, the inner air cavity 2 of the centering component compresses the outer air cavity 4, and the gas in the outer air cavity 4 flows to the inner air cavity 2 of the adjacent centering component via the hose, the inner air cavity 2 is inflated, and the FRP pipe body is pulled in this direction, and similarly, the inner air cavity 2 of each FRP pipe body is inflated in turn until balance is achieved, thereby maintaining the centering position of the inflated inner air cavity 2.

[0040] The side of the outer air cavity 4 facing away from the inner air cavity 2 is vertically rotatably connected with a guide wheel 3, and the guide wheel 3 fits the inner wall of the drill hole to facilitate the lowering and centering of the glass fiber reinforced plastic pipe.

[0041] The multi-port injection mechanism includes a plurality of injection units arranged around an injection well 1, each injection unit includes an injection pipe 6 and a booster pump arranged on the injection pipe 6, one end of the injection pipe 6 is provided with a quick connector, and the other end is connected to the circumferential side of the injection well 1, and a one-way flow component is provided between the booster pump and the injection well 1. The one-way flow component includes an annular blocking ring 8 fixed on the inner wall of the injection pipe 6, a flow hole opened on the annular blocking ring 8, and a blocking ball 7 arranged inside the injection pipe 6 in alignment with the flow hole. The blocking ball 7 and the annular blocking ring 8 are arranged inside the injection pipe 6 in sequence along the direction of carbon dioxide injection; the blocking ball 7 is also connected to the inner wall of the injection pipe 6 via a reset spring 9, and a movement margin is left between the blocking ball 7 and the inner wall of the injection pipe 6. When there is no carbon dioxide injection, the blocking ball 7 and the annular blocking ring 8 are pressed tightly to close the flow hole. That is, when carbon dioxide is injected, the carbon dioxide is used to impact the blocking ball 7 to open the connecting hole, and the carbon dioxide flows into the injection well 1 through the connecting hole and the injection pipe 6. When there is no carbon dioxide injection, the blocking ball 7 closes the flow hole. At this time, when carbon dioxide enters the injection pipe 6 from the injection well 1 in the reverse direction, the blocking ball 7 is further pressed to the flow hole, thereby further improving the sealing effect and avoiding backflow.

[0042] Therefore, the present invention adopts the above-mentioned structure of the underground carbon dioxide injection device, and replaces the traditional cast iron pipe with a centering glass fiber reinforced plastic pipe with a driving sealing structure, which greatly improves the corrosion resistance and sealing performance, and helps to efficiently inject carbon dioxide into the saline water layer.

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

Claims

1. A carbon dioxide underground injection device, characterized in that: It includes a multi-port injection mechanism arranged on the ground, and a multi-section self-sealing centering injection well connected with the output end of the multi-port injection mechanism, the injection well is composed of a multi-section centering glass fiber reinforced plastic pipe sequentially extended into the wellbore, and a sealing structure is arranged between the centering glass fiber reinforced plastic pipes at two adjacent ends; Concrete slurry is poured between the FRP pipe and the inner wall of the borehole; The centering glass fiber reinforced plastic pipe comprises a glass fiber reinforced plastic pipe body and a plurality of centering components evenly arranged around the circumference of the glass fiber reinforced plastic pipe body, the centering components comprising an inner air cavity fixed at one end to the outer circumference of the glass fiber reinforced plastic pipe body and an outer air cavity fixed at the other end of the inner air cavity, the outer air cavity being slidably arranged inside the inner air cavity; The inner air cavity and the outer air cavity of two adjacent centering components are connected in an alternating manner via a hose; The multi-port injection mechanism includes a plurality of injection units arranged around the injection well, each injection unit includes an injection pipe and a booster pump arranged on the injection pipe, one end of the injection pipe is provided with a quick connector, the other end is connected to the circumferential side of the injection well, and a one-way flow component is provided between the booster pump and the injection well; The one-way flow assembly includes an annular blocking ring fixed on the inner wall of the injection pipe, a flow hole opened on the annular blocking ring, and a blocking ball aligned with the flow hole and arranged inside the injection pipe, wherein the blocking ball and the annular blocking ring are sequentially arranged inside the injection pipe along the direction of carbon dioxide injection; The blocking ball is also connected to the inner wall of the injection pipe via a return spring, and a movement margin is left between the blocking ball and the inner wall of the injection pipe; The centering principle is: when the FRP pipe body tilts toward one of the centering components, the inner air cavity of this centering component compresses the outer air cavity, and the gas in the outer air cavity flows to the inner air cavity of the adjacent centering component through the hose. The inner air cavity is inflated, pulling the FRP pipe body in this direction. Similarly, the inner air cavity of each FRP pipe body is inflated in turn until balance is achieved, thereby maintaining the centering position of the inflated inner air cavity.

2. A carbon dioxide underground injection device according to claim 1, characterized in that: The sealing structure includes an insertion ring fixed to one end of the centering glass fiber reinforced plastic pipe, an annular insertion groove opened at the other end of the centering glass fiber reinforced plastic pipe, and a multi-layer sealing protrusion arranged on the inner wall of the annular insertion groove, and the sealing protrusion is a flexible resin; Two adjacent sections of the centering glass fiber reinforced plastic pipes are plugged in sequentially through the inserting ring and the annular inserting groove, and are sealed and connected through the sealing protrusion.

3. A carbon dioxide underground injection device according to claim 2, characterized in that: The flexible resin has a porous structure.

4. A carbon dioxide underground injection device according to claim 1, characterized in that: A guide wheel is vertically rotatably connected to a side of the outer air cavity away from the inner air cavity, and the guide wheel is in contact with the inner wall of the drill hole.

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