Carbon dioxide oil and gas displacement sealing device for coal-oil-gas symbiotic area

Abstract

The invention relates to the technical field of carbon dioxide oil displacement, in particular to a carbon dioxide oil displacement and gas displacement sealing device for a coal-oil-gas symbiotic area. The gas injection assembly is arranged above the base; the storage tank is fixedly arranged at the top of the base, and the gas inlet end of the gas injection assembly communicates with the interior of the storage tank; the conveying pipe is arranged above the base, and the gas outlet end of the gas injection assembly communicates with the interior of the conveying pipe; and the position adjusting assembly is arranged above the base, and the output end of the position adjusting assembly is connected with the conveying pipe. When the device is used, the device is moved to a designated place through the base, the gas injection assembly can pump carbon dioxide in the storage tank into the conveying pipe, the conveying pipe discharges the carbon dioxide into the ground, and oil type gas, methane and coal bed gas can be pumped to the ground. The position adjusting assembly can drive the conveying pipe to move in the vertical direction, the position of the conveying pipe in the vertical direction can be freely changed, the conveying pipe automatically moves upwards again, and carbon dioxide is discharged at a specific accurate position.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide enhanced oil recovery, and specifically relates to a carbon dioxide enhanced oil recovery, gas displacement and storage device in a coalbed methane and oil coexistence area. Background Art

[0002] The carbon dioxide enhanced oil recovery and gas displacement technology is to inject carbon dioxide underground to drive the flow of oil, oil-type gas and coalbed methane in order to improve the oil recovery rate of oilfields. In the prior art, a carbon dioxide injection device can be used to continuously inject carbon dioxide underground to improve the continuous supply efficiency of carbon dioxide gas. For example, a Chinese invention patent with the patent application number "CN201811267136.3" provides a carbon dioxide injection device for carbon dioxide enhanced oil recovery. When the device is in use, the second air duct can slide within the first air duct. First, the second air duct is inserted into the oil and gas well, and then through the left and right movement of the piston, carbon dioxide is first discharged into the first air duct and the second air duct, and then discharged into the oil and gas well.

[0003] However, this device has deficiencies. The first air duct in this device is fixedly connected to the fixed column, so the first air duct cannot move in the vertical direction, and the second air duct is not connected to any driving device that can adjust the position. This results in that after the second air duct slides down, it cannot automatically move up again. Therefore, the second air duct cannot arbitrarily change its position in the vertical direction underground, and it cannot achieve discharging carbon dioxide at a specific precise position. Summary of the Invention

[0004] The purpose of the present invention is to provide a carbon dioxide enhanced oil recovery, gas displacement and storage device in a coalbed methane and oil coexistence area. The position adjustment assembly can drive the delivery pipe to move in the vertical direction. The delivery pipe can arbitrarily change its position in the vertical direction, automatically move up again, and achieve discharging carbon dioxide at a specific precise position.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A carbon dioxide enhanced oil recovery, gas displacement and storage device in a coalbed methane and oil coexistence area, comprising: a base; an air injection assembly provided above the base; a storage tank fixedly arranged on the top of the base, the intake end of the air injection assembly being communicated with the inside of the storage tank; a delivery pipe provided above the base, the outlet end of the air injection assembly being communicated with the inside of the delivery pipe; a position adjustment assembly provided above the base, the output end of the position adjustment assembly being connected to the delivery pipe for driving the delivery pipe to move in the vertical direction.

[0006] Preferably, the position adjustment assembly includes: a limit frame fixedly arranged on the top of the base. A chute is provided on the side wall of the limit frame away from the conveying pipe, and an avoidance groove is provided on the side wall of the limit frame facing the conveying pipe. The avoidance groove is communicated with the chute. The length of the limit frame is greater than the length of the conveying pipe, and the conveying pipe can slide along the side wall of the limit frame; a position adjustment plate arranged in the chute and capable of sliding along the chute. The length of the position adjustment plate is greater than the length of the limit frame. The bottom of the position adjustment plate facing the conveying pipe is connected to the conveying pipe; a first driver fixedly arranged on the top of the base. The output end of the first driver is connected to the position adjustment plate for driving the position adjustment plate to move in the vertical direction.

[0007] Preferably, the air injection assembly includes: an air injection box fixedly arranged on the top of the base; a gas driving plate arranged inside the air injection box and capable of sliding along the inner wall of the air injection box. The gas driving plate divides the interior of the air injection box into a first air guide cavity and a second air guide cavity. Both the first air guide cavity and the second air guide cavity are communicated with the interior of the storage tank; a first electric telescopic rod arranged below the air injection box. The output end of the first electric telescopic rod extends into the air injection box and is fixedly connected to the gas driving plate; an air supply assembly. The air supply assembly includes a first air supply pipe. The top of the first air supply pipe is arranged outside the conveying pipe and fixedly connected to the top of the limit frame. There is a gap between the first air supply pipe and the avoidance groove. The bottom of the first air supply pipe extends into the conveying pipe. The interiors of the first air guide cavity, the second air guide cavity, and the conveying pipe are all communicated with the interior of the first air supply pipe.

[0008] Preferably, the air supply assembly further includes a second air supply pipe and a separation disk. The length of the first air supply pipe is the same as the length of the conveying pipe. The second air supply pipe and the separation disk are respectively fixedly arranged at the top and bottom of the first air supply pipe. Both the first air guide cavity and the second air guide cavity are communicated with the interior of the first air supply pipe through the second air supply pipe. The separation disk can slide along the inner wall of the conveying pipe. An exhaust cavity is provided on the bottom surface of the separation disk, and the exhaust cavity is communicated with the interior of the first air supply pipe.

[0009] Preferably, the gas injection assembly further includes a two-way gas guiding assembly, which includes: a first gas pipe disposed between the gas injection box and the storage tank, with the first end of the first gas pipe communicating with the inside of the storage tank; a second gas pipe disposed between the gas injection box and the first gas pipe, with the first end of the second gas pipe communicating with the second end of the first gas pipe. A first one-way valve is provided at the second end of the first gas pipe. The second end of the second gas pipe is fixedly disposed on the top surface of the gas injection box and communicates with the first gas guiding cavity. A second one-way valve is provided at the second end of the second gas pipe; a third gas pipe, the first end of the third gas pipe is fixedly disposed on the top surface of the gas injection box and communicates with the first gas guiding cavity. A third one-way valve is provided at the first end of the third gas pipe. The second end of the third gas pipe communicates with the first end of the second gas delivery pipe, and the second end of the second gas delivery pipe communicates with the inside of the first gas delivery pipe.

[0010] Preferably, the two-way gas guiding assembly further includes: a fourth gas pipe disposed between the gas injection box and the first gas pipe, with the first end of the fourth gas pipe communicating with the middle of the first gas pipe. The second end of the fourth gas pipe is fixedly disposed on the bottom surface of the gas injection box and communicates with the second gas guiding cavity. Fourth and fifth one-way valves are respectively provided at both ends of the fourth gas pipe; a fifth gas pipe disposed on the side of the gas injection box away from the first gas pipe. The first end of the fifth gas pipe is fixedly disposed on the bottom surface of the gas injection box and communicates with the second gas guiding cavity. The second end of the fifth gas pipe communicates with the middle of the third gas pipe. Sixth and seventh one-way valves are respectively provided at both ends of the fifth gas pipe.

[0011] Preferably, the first driver includes: a metal plate fixedly disposed on the side wall of the limit frame; a magnet plate fixedly disposed on the side wall of the position adjustment plate; a rack fixedly disposed on the side wall of the position adjustment plate away from the delivery pipe, and the length of the rack is the same as the length of the position adjustment plate; a motor fixedly disposed on the top of the base, and the output end of the motor is fixedly connected to a gear, and the gear is in meshing transmission with the rack.

[0012] Preferably, an avoidance channel is provided on the first gas delivery pipe, which penetrates the side wall of the first gas delivery pipe. The depth extension direction of the avoidance channel is the same as that of the avoidance groove. The avoidance channel does not communicate with the inside of the first gas delivery pipe. The position adjustment assembly further includes a locking assembly, and the locking assembly is disposed inside the avoidance channel. The position adjustment plate is connected to the delivery pipe through the locking assembly.

[0013] Preferably, the locking assembly includes: a plugging plate. An assembly cavity is provided inside the position-adjusting plate. The top of the assembly cavity penetrates through the side wall of the position-adjusting plate facing the avoidance groove. The plugging plate is arranged inside the assembly cavity and can slide along the inner wall of the assembly cavity; a plugging column. A first jack is provided on the side wall of the position-adjusting plate. The first end of the plugging column is fixedly connected to the side wall of the plugging plate facing the avoidance groove. The second end of the plugging column extends into the first jack and can slide along the inner wall of the first jack. The length of the plugging column is greater than the depth of the first jack. The depth of the assembly cavity is greater than the sum of the thickness of the plugging plate and the length of the plugging column. A second jack is provided on the outer surface of the delivery pipe, and the position of the second jack corresponds to that of the first jack; a second driver is arranged on the top of the delivery pipe. The output end of the second driver passes through the avoidance channel and is connected to the top of the plugging plate. The second driver is used to drive the plugging plate to move horizontally.

[0014] Preferably, there are several plugging columns, first jacks and second jacks, and they are equally spaced from top to bottom; the second driver includes: a connecting plate arranged on the top of the delivery pipe and detachably connected to the delivery pipe; a second electric telescopic rod fixedly arranged on the side wall of the connecting plate facing the avoidance channel. The output end of the second electric telescopic rod extends into the assembly cavity and is fixedly connected to the plugging plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are: (1) The present invention includes a base, an air injection assembly, a storage tank, a delivery pipe and a position-adjusting assembly. When the present invention is in use, the air injection assembly can pump carbon dioxide in the storage tank into the delivery pipe, and the delivery pipe discharges the carbon dioxide underground. The position-adjusting assembly can drive the delivery pipe to move in the vertical direction. The delivery pipe can arbitrarily change its position in the vertical direction and automatically move upward again to discharge carbon dioxide at a specific precise position.

[0016] (2) In the present invention, the air injection assembly further includes a two-way air guiding assembly. The two-way air guiding assembly can ensure that no matter which direction the air driving plate moves, the carbon dioxide in the air injection box can continuously enter the second air delivery pipe through the third air delivery pipe, and the carbon dioxide on both sides of the air driving plate will not affect the movement of the air driving plate.

[0017] (3) In the present invention, the position-adjusting assembly further includes a locking assembly. The locking assembly is arranged inside the avoidance channel. The locking assembly can make the position-adjusting plate and the delivery pipe enter a locked state or a separated state, so that the position-adjusting plate and the delivery pipe move together, or the delivery pipe can be detached from the position-adjusting assembly. Description of the Drawings

[0018] Figure 1 Isometric view of the present invention; Figure 2 Front view sectional view of the present invention; Figure 3 Isometric view of the base and the storage tank in the present invention; Figure 4 Isometric view of the gas injection assembly in the present invention; Figure 5 Isometric sectional view of the gas injection box in the present invention; Figure 6 Isometric view of the gas delivery assembly in the present invention; Figure 7 Isometric sectional view of the first gas delivery pipe in the present invention; Figure 8 Is Figure 7 Enlarged view of part A in Figure 9 Isometric view of the isolation disc in the present invention; Figure 10 Isometric view of the two-way gas guiding assembly in the present invention; Figure 11 Front view sectional view of the first gas guiding pipe in the present invention; Figure 12 Front view sectional view of the second gas guiding pipe in the present invention; Figure 13 Front view sectional view of the third gas guiding pipe and the fifth gas guiding pipe in the present invention; Figure 14 Front view sectional view of the fourth gas guiding pipe in the present invention; Figure 15 Isometric view of the delivery pipe in the present invention; Figure 16 Is Figure 15 Enlarged view of part B in Figure 17 Isometric view of the position adjustment assembly in the present invention; Figure 18 Isometric view of the limit frame in the present invention; Figure 19 Is Figure 18 Enlarged view of part C in Figure 20 Isometric view of the position adjustment plate in the present invention; Figure 21 Is Figure 20 Enlarged view of part D in Figure 22 Isometric view of the first driver in the present invention; Figure 23 Isometric view of the locking assembly in the present invention; Figure 24 Is Figure 23 Enlarged view of part E in

[0019] The reference numerals include: 1 - Base, 2 - Gas injection assembly, 21 - Gas injection box, 211 - First air guide cavity, 212 - Second air guide cavity, 22 - Air driving plate, 23 - First electric telescopic rod, 24 - Air supply assembly, 241 - First air supply pipe, 2411 - Avoidance channel, 242 - Second air supply pipe, 243 - Isolation plate, 2431 - Exhaust cavity, 25 - Bidirectional air guide assembly, 251 - First air guide pipe, 2511 - First one - way valve, 252 - Second air guide pipe, 2521 - Second one - way valve, 253 - Third air guide pipe, 2531 - Third one - way valve, 254 - Fourth air guide pipe, 2541 - Fourth one - way valve, 2542 - Fifth one - way valve, 255 - Fifth air guide pipe, 2551 - Sixth one - way valve, 2552 - Seventh one - way valve, 3 - Storage tank, 4 - Delivery pipe, 41 - Second jack, 5 - Position adjustment assembly, 51 - Limit frame, 511 - Slide groove, 512 - Avoidance groove, 52 - Position adjustment plate, 521 - Assembly cavity, 522 - First jack, 53 - First driver, 531 - Metal plate, 532 - Magnet plate, 533 - Rack, 534 - Motor, 535 - Gear, 54 - Locking assembly, 541 - Plug - in plate, 542 - Plug - in post, 543 - Second driver, 5431 - Connecting plate, 5432 - Second electric telescopic rod. Detailed implementation mode

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment 1

[0021] Please refer to Figure 1-24, the present invention provides a technical solution: a carbon dioxide flooding, gas displacement and storage device in a coal and oil gas co-generation area, which includes a base 1, an air injection component 2, a storage tank 3, a delivery pipe 4 and a position adjustment component 5. In this embodiment, universal wheels are installed at the bottom of the base 1, which is convenient for moving the present invention to a designated location. A drilling mechanism and a storage mechanism (not shown in the figure) can also be installed on the base 1, which is convenient for completing surface drilling and subsequent carbon dioxide storage operations. After the surface drilling is completed, first extract oil, oil-type gas and coalbed methane. When the extraction rate and oil production rate decrease, the position adjustment component 5 drives the delivery pipe 4 to move downward in the vertical direction, and the air injection component 2 pumps the carbon dioxide in the storage tank 3 into the delivery pipe 4, and the delivery pipe 4 discharges the carbon dioxide underground through the conical gas pipe head at the bottom. The underground coal seam is located above the sandstone layer and the shale layer, and there are fissures between the coal seam and the shale layer. When the carbon dioxide is discharged underground, gas molecules such as oil-type gas and methane can enter the roadway and goaf in the coal seam area through the fissures, and then pour into the heading face. The oil-type gas, methane and coalbed methane can all be pumped to the ground. This operation can displace methane in the coal seam, reduce gas accidents, and also drive the flow of oil and oil-type gas, improving the oil and gas production rate. When the extraction is completed and coal mining ends, the carbon dioxide can be stored in the closed space after coal seam mining and the oil reservoir. When the present invention is in use, the delivery pipe 4 can arbitrarily change its position in the vertical direction and automatically move upward again to discharge carbon dioxide at a specific precise position.

[0022] Please refer to Figure 1-8 , the air injection component 2 includes an air injection box 21, a gas displacement plate 22, a first electric telescopic rod 23 and a gas delivery component 24. The gas displacement plate 22 divides the interior of the air injection box 21 into a first air guide cavity 211 and a second air guide cavity 212. The gas delivery component 24 includes a first gas delivery pipe 241, and the bottom of the first gas delivery pipe 241 extends into the delivery pipe 4. The output end of the first electric telescopic rod 23 can drive the gas displacement plate 22 to reciprocate upward or downward along the inner wall of the air injection box 21 by extending and shortening. When the gas displacement plate 22 moves upward, the carbon dioxide in the storage tank 3 is pumped into the second air guide cavity 212, and the gas in the first air guide cavity 211 is pumped into the first gas delivery pipe 241 and finally discharged into the delivery pipe 4. When the gas displacement plate 22 moves downward, the carbon dioxide in the storage tank 3 is pumped into the first air guide cavity 211, and the gas in the second air guide cavity 212 is pumped into the first gas delivery pipe 241 and finally discharged into the delivery pipe 4. Therefore, no matter which direction the gas displacement plate 22 moves, the carbon dioxide in the air injection box 21 can continuously enter the delivery pipe 4 and discharge the carbon dioxide underground through the conical gas pipe head, ensuring the stable and orderly injection of carbon dioxide and improving the continuous supply efficiency of carbon dioxide.

[0023] Please refer to Figure 1-9, the air supply assembly 24 further includes a second air supply pipe 242 and an isolation disk 243. An exhaust cavity 2431 is provided on the bottom surface of the isolation disk 243. When the air driving plate 22 reciprocates, the carbon dioxide in the first air guide cavity 211 and the second air guide cavity 212 is first discharged into the second air supply pipe 242, then discharged into the first air supply pipe 241 through the second air supply pipe 242, and then discharged into the exhaust cavity 2431 through the first air supply pipe 241, and finally discharged into the delivery pipe 4. When the delivery pipe 4 does not extend into the ground, the isolation disk 243 is located at the bottom inside the delivery pipe 4. When the delivery pipe 4 moves downward and extends into the ground, the isolation disk 243 slides along the inner wall of the delivery pipe 4. Therefore, no matter which position the bottom of the delivery pipe 4 moves to after reaching the ground, the carbon dioxide entering the delivery pipe 4 through the exhaust cavity 2431 can only fill the area below the isolation disk 243 inside the delivery pipe 4, and the carbon dioxide cannot enter the area above the isolation disk 243 inside the delivery pipe 4, avoiding waste of carbon dioxide.

[0024] Please refer to Figure 1-9 and Figure 17-22 , the position adjustment assembly 5 includes a limit frame 51, a position adjustment plate 52 and a first driver 53. The first driver 53 can drive the position adjustment plate 52 to move in the vertical direction. The bottom of the position adjustment plate 52 is connected to the delivery pipe 4. Therefore, the delivery pipe 4 can move up or down together with the position adjustment plate 52 to change its position in the vertical direction. A sliding groove 511 and an avoidance groove 512 are provided on the limit frame 51. The position adjustment plate 52 can slide along the sliding groove 511 to prevent the position adjustment plate 52 from deflecting to both sides. The avoidance groove 512 can ensure that there is sufficient movement space at the connection position between the delivery pipe 4 and the position adjustment plate 52 when they move, and there will be no interference with the limit frame 51. Embodiment 2

[0025] On the basis of Embodiment 1, please refer to Figure 1-22 , the gas injection assembly 2 further includes a two-way air guide assembly 25. The two-way air guide assembly 25 includes a first air guide pipe 251, a second air guide pipe 252, a third air guide pipe 253, a fourth air guide pipe 254 and a fifth air guide pipe 255. A first one-way valve 2511 is provided in the first air guide pipe 251, a second one-way valve 2521 is provided in the second air guide pipe 252, a third one-way valve 2531 is provided in the third air guide pipe 253, a fourth one-way valve 2541 and a fifth one-way valve 2542 are provided in the fourth air guide pipe 254, and a sixth one-way valve 2551 and a seventh one-way valve 2552 are provided in the fifth air guide pipe 255. The two-way air guide assembly 25 can ensure that no matter which direction the air driving plate 22 moves, the carbon dioxide in the gas injection box 21 can continuously enter the second air supply pipe 242 through the third air guide pipe 253, and the carbon dioxide on both sides of the air driving plate 22 will not affect the movement of the air driving plate 22.

[0026] Please refer to Figure 1-22, when the air driving plate 22 moves upward, the gas in the first air guiding cavity 211 is discharged into the second air supply pipe 242 through the third air guiding pipe 253. At this time, the second one-way valve 2521 can prevent the gas in the first air guiding cavity 211 from entering the second air guiding pipe 252, and the seventh one-way valve 2552 can prevent the gas in the first air guiding cavity 211 from entering the fifth air guiding pipe 255. Meanwhile, the carbon dioxide in the storage tank 3 first enters the first air guiding pipe 251, and then is pumped into the second air guiding cavity 212 through the fourth air guiding pipe 254. The first one-way valve 2511 can prevent the gas in the second air guiding pipe 252 from being pumped into the fourth air guiding pipe 254, and the sixth one-way valve 2551 can prevent the gas in the fifth air guiding pipe 255 from being pumped into the second air guiding cavity 212.

[0027] Please refer to Figure 1-22 , when the air driving plate 22 moves downward, the gas in the second air guiding cavity 212 enters the third air guiding pipe 253 through the fifth air guiding pipe 255, and then is discharged into the second air supply pipe 242. At this time, the third one-way valve 2531 can prevent the gas in the second air guiding cavity 212 from entering the first air guiding cavity 211, and the fifth one-way valve 2542 can prevent the gas in the second air guiding cavity 212 from entering the fourth air guiding pipe 254. Meanwhile, the carbon dioxide in the storage tank 3 first enters the first air guiding pipe 251, and then is pumped into the first air guiding cavity 211 through the second air guiding pipe 252. The fourth one-way valve 2541 can prevent the gas in the fourth air guiding pipe 254 from being pumped into the second air guiding pipe 252. Embodiment III

[0028] On the basis of Embodiment I, please refer to Figure 1-22 , the first driver 53 includes a metal plate 531, a magnet plate 532, a rack 533, a motor 534 and a gear 535. When it is necessary to control the downward movement of the conveying pipe 4, the motor 534 drives the gear 535 to rotate forward, the gear 535 drives the rack 533 to move downward, and the rack 533 drives the conveying pipe 4 to move downward through the position adjusting plate 52. At this time, the position adjusting plate 52 slides along the sliding groove 511. When the conveying pipe 4 reaches the specified position, the motor 534 stops working, and the magnet plate 532 can adsorb the metal plate 531, and the position adjusting plate 52 and the conveying pipe 4 hover and remain stationary together. When it is necessary to change the moving direction of the conveying pipe 4, the motor 534 drives the gear 535 to rotate reversely, and the position adjusting plate 52 drives the conveying pipe 4 to move upward. Embodiment IV

[0029] On the basis of Embodiment I, please refer to Figure 1-24, an avoidance channel 2411 is provided on the first air delivery pipe 241. The position adjustment assembly 5 further includes a locking assembly 54, and the locking assembly 54 is arranged inside the avoidance channel 2411. The locking assembly 54 can enable the position adjustment plate 52 and the delivery pipe 4 to enter a locked state or a separated state, so that the position adjustment plate 52 and the delivery pipe 4 move together, or the delivery pipe 4 is removed from the position adjustment assembly 5.

[0030] Please refer to Figure 1-24 , the locking assembly 54 includes a plugging plate 541, a plugging post 542 and a second driver 543. The second driver 543 includes a connecting plate 5431 and a second electric telescopic rod 5432. When the position adjustment plate 52 and the delivery pipe 4 need to enter the locked state, the second electric telescopic rod 5432 shortens, driving the plugging plate 541 to approach the delivery pipe 4. The plugging plate 541 slides along the inner wall of the assembly cavity 521. The plugging post 542 passes through the first jack 522 and enters the second jack 41 on the outer surface of the delivery pipe 4. The plugging post 542 can provide a supporting force for the delivery pipe 4 to ensure that the delivery pipe 4 and the position adjustment plate 52 can move synchronously. In this embodiment, there are several first jacks 522 and second jacks 41, so that the delivery pipe 4 is uniformly stressed. The plugging post 542 can also apply a pressure to the delivery pipe 4 to ensure that the delivery pipe 4 can slide along the outer surfaces of the first air delivery pipe 241 and the limit frame 51, increasing the stability of the delivery pipe 4. When the delivery pipe 4 moves in the vertical direction, both the plugging post 542 and the second driver 543 move in the avoidance channel 2411. Therefore, the plugging post 542 and the second driver 543 will not interfere with the first air delivery pipe 241. When the position adjustment plate 52 and the delivery pipe 4 need to enter the separated state, the second electric telescopic rod 5432 elongates, driving the plugging plate 541 away from the delivery pipe 4. The plugging post 542 leaves the second jack 41 and returns to the first jack 522. At this time, the connecting plate 5431 is removed from the top of the delivery pipe 4, and the delivery pipe 4 is no longer restricted. The delivery pipe 4 can be removed from the position adjustment assembly 5.

[0031] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0032] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for carbon dioxide enhanced oil and gas recovery and storage in a coalbed methane and natural gas co-production area, characterized in that, Comprising: Base; Gas injection assembly, provided above the base; Storage tank, fixedly arranged on the top of the base, the intake end of the gas injection assembly is communicated with the interior of the storage tank; Delivery pipe, provided above the base, the outlet end of the gas injection assembly is communicated with the interior of the delivery pipe; Position adjustment assembly, provided above the base, the output end of the position adjustment assembly is connected to the delivery pipe for driving the delivery pipe to move in the vertical direction.

2. The carbon dioxide flooding, gas displacement and storage device in the coalbed methane and natural gas coexistence area according to claim 1, wherein The position adjustment assembly includes: Limit frame, fixedly arranged on the top of the base, a chute is provided on the side wall of the limit frame away from the delivery pipe, an avoidance groove is provided on the side wall of the limit frame facing the delivery pipe, the avoidance groove is communicated with the chute, the length of the limit frame is greater than the length of the delivery pipe, and the delivery pipe can slide along the side wall of the limit frame; Position adjustment plate, the position adjustment plate is arranged in the chute and can slide along the chute, the length of the position adjustment plate is greater than the length of the limit frame, and the bottom of the position adjustment plate facing the delivery pipe is connected to the delivery pipe; First driver, fixedly arranged on the top of the base, the output end of the first driver is connected to the position adjustment plate for driving the position adjustment plate to move in the vertical direction.

3. The carbon dioxide flooding, gas displacement and storage device in the coalbed methane and natural gas coexistence area according to claim 2, wherein The gas injection assembly includes: Gas injection box, fixedly arranged on the top of the base; Gas driving plate, arranged inside the gas injection box and can slide along the inner wall of the gas injection box, the gas driving plate divides the interior of the gas injection box into a first air guide cavity and a second air guide cavity, and both the first air guide cavity and the second air guide cavity are communicated with the interior of the storage tank; First electric telescopic rod, arranged below the gas injection box, the output end of the first electric telescopic rod extends into the gas injection box and is fixedly connected to the gas driving plate; Gas delivery assembly, the gas delivery assembly includes a first gas delivery pipe, the top of the first gas delivery pipe is arranged outside the delivery pipe and is fixedly connected to the top of the limit frame, there is a gap between the first gas delivery pipe and the avoidance groove, the bottom of the first gas delivery pipe extends into the delivery pipe, and the first air guide cavity, the second air guide cavity and the interior of the delivery pipe are all communicated with the interior of the first gas delivery pipe.

4. The carbon dioxide flooding, gas displacement and storage device in the coalbed methane and natural gas coexistence area according to claim 3, characterized in that, The gas delivery assembly further includes a second gas delivery pipe and a separation disc, the length of the first gas delivery pipe is the same as the length of the delivery pipe, the second gas delivery pipe and the separation disc are respectively fixedly arranged on the top and bottom of the first gas delivery pipe, both the first air guide cavity and the second air guide cavity are communicated with the interior of the first gas delivery pipe through the second gas delivery pipe, the separation disc can slide along the inner wall of the delivery pipe, and an exhaust cavity is provided on the bottom surface of the separation disc, and the exhaust cavity is communicated with the interior of the first gas delivery pipe.

5. The carbon dioxide flooding, gas displacement and storage device in the coalbed methane and natural gas coexistence area according to claim 4, wherein, The gas injection assembly further includes a two-way air guide assembly, and the two-way air guide assembly includes: First air guide pipe, arranged between the gas injection box and the storage tank, the first end of the first air guide pipe is communicated with the interior of the storage tank; The second air duct is arranged between the air injection box and the first air duct. The first end of the second air duct communicates with the second end of the first air duct. A first one-way valve is provided at the second end of the first air duct. The second end of the second air duct is fixedly arranged on the top surface of the air injection box and communicates with the first air guiding cavity. A second one-way valve is provided at the second end of the second air duct; The third air duct, the first end of the third air duct is fixedly arranged on the top surface of the air injection box and communicates with the first air guiding cavity. A third one-way valve is provided at the first end of the third air duct. The second end of the third air duct communicates with the first end of the second air delivery pipe. The second end of the second air delivery pipe communicates with the inside of the first air delivery pipe.

6. The carbon dioxide flooding, gas displacement and storage device in the coalbed methane and natural gas coexistence area according to claim 5, wherein The two-way air guiding assembly further includes: The fourth air duct is arranged between the air injection box and the first air duct. The first end of the fourth air duct communicates with the middle part of the first air duct. The second end of the fourth air duct is fixedly arranged on the bottom surface of the air injection box and communicates with the second air guiding cavity. Fourth and fifth one-way valves are respectively provided at both ends of the fourth air duct; The fifth air duct is arranged on one side of the air injection box away from the first air duct. The first end of the fifth air duct is fixedly arranged on the bottom surface of the air injection box and communicates with the second air guiding cavity. The second end of the fifth air duct communicates with the middle part of the third air duct. Sixth and seventh one-way valves are respectively provided at both ends of the fifth air duct.

7. The carbon dioxide flooding, gas displacement and storage device in the coalbed methane and natural gas coexistence area according to claim 3, characterized in that The first driver includes: A metal plate fixedly arranged on the side wall of the limit frame; A magnet plate fixedly arranged on the side wall of the position adjustment plate; A rack fixedly arranged on the side wall of the position adjustment plate away from the delivery pipe. The length of the rack is the same as the length of the position adjustment plate; A motor fixedly arranged on the top of the base. The output end of the motor is fixedly connected with a gear. The gear is in meshing transmission with the rack.

8. The carbon dioxide flooding, gas displacement and storage device in the coalbed methane and natural gas coexistence area according to claim 3, wherein, An avoidance channel is provided on the first air delivery pipe. The avoidance channel penetrates through the side wall of the first air delivery pipe. The depth extension direction of the avoidance channel is the same as that of the avoidance groove. The avoidance channel does not communicate with the inside of the first air delivery pipe. The position adjustment assembly further includes a locking assembly. The locking assembly is arranged inside the avoidance channel. The position adjustment plate is connected to the delivery pipe through the locking assembly.

9. The carbon dioxide flooding, gas displacement and storage device in the coalbed methane and natural gas coexistence area according to claim 8, wherein The locking assembly includes: A plugging plate. An assembly cavity is provided inside the position adjustment plate. The top of the assembly cavity penetrates through the side wall of the position adjustment plate facing the avoidance groove. The plugging plate is arranged inside the assembly cavity and can slide along the inner wall of the assembly cavity; Insertion post. A first jack is provided on the side wall of the position adjustment plate. The first end of the insertion post is fixedly connected to the side wall of the insertion plate facing the avoidance groove. The second end of the insertion post extends into the first jack and can slide along the inner wall of the first jack. The length of the insertion post is greater than the depth of the first jack. The depth of the assembly cavity is greater than the sum of the thickness of the insertion plate and the length of the insertion post. A second jack is provided on the outer surface of the delivery pipe, and the position of the second jack corresponds to that of the first jack. Second driver, provided on the top of the delivery pipe. The output end of the second driver passes through the avoidance channel and is connected to the top of the insertion plate. The second driver is used to drive the insertion plate to move horizontally.

10. The carbon dioxide flooding, gas displacement and storage device in the coalbed methane and natural gas coexistence area according to claim 9, characterized in that, There are several of the insertion posts, the first jacks, and the second jacks, and they are equally spaced from top to bottom. The second driver includes: Connection plate, provided on the top of the delivery pipe and detachably connected to the delivery pipe. Second electric telescopic rod, fixedly provided on the side wall of the connection plate facing the avoidance channel. The output end of the second electric telescopic rod extends into the assembly cavity and is fixedly connected to the insertion plate.

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