A carbon dioxide storage and energy storage system and method based on well pattern mode

Abstract

The present invention discloses a carbon dioxide storage and energy storage system and method based on a well network mode, including a carbon dioxide storage and energy storage system and an underground salt water extraction system, which together form a circulation system; the present application proposes a storage and energy storage system of supercritical carbon dioxide "horizontal well network + vertical well pumping" combination, when carbon dioxide is injected into a horizontal well, the pumping of water through the vertical well can reduce the carbon dioxide injection resistance and improve the injection efficiency of the salt water layer; when carbon dioxide is released for power generation, the pumped groundwater is injected into the salt water layer through the vertical well, which helps to speed up the power generation speed of carbon dioxide. In addition, in this process, the underground salt water is recycled without other chemical additives, and the ecological environment of the area is not affected.

Description

Technical Field

[0001] The present invention relates to the field of carbon dioxide storage and energy storage, and in particular to a carbon dioxide storage and energy storage system and method based on a well pattern mode. Background Art

[0002] Carbon dioxide geological storage is considered to be one of the effective measures to reduce the concentration of carbon dioxide in the atmosphere and alleviate the greenhouse effect. Deep saline aquifers are widely distributed and have huge storage potential. There are also actual engineering cases in use, so it has always been a hot topic of international research. At present, vertical wells are often used to inject carbon dioxide into saline aquifers, and the storage capacity is relatively limited. In order to increase the storage capacity and energy storage of carbon dioxide, the present invention proposes a supercritical carbon dioxide "horizontal well network injection + vertical well pumping" system and method, which uses horizontal well networks to expand the radiation range of carbon dioxide and vertical well pumping to increase the injection space of carbon dioxide. Summary of the invention

[0003] The purpose of the present invention is to solve the problems in the above-mentioned background technology and to provide a carbon dioxide storage and energy storage system and method based on a well pattern mode.

[0004] A carbon dioxide storage and energy storage system based on a well network mode, comprising a carbon dioxide storage and energy storage system and an underground salt water extraction system, wherein the carbon dioxide storage and energy storage system and the underground salt water extraction system together form a circulation system;

[0005] The carbon dioxide storage and energy storage system includes a wind power generation unit, a solar power generation unit, a rectifier, a carbon dioxide manifold, a compressor, a high-pressure carbon dioxide storage tank, a first switch valve, a heater, a pressure sensor, a temperature sensor, a second switch valve, a third switch valve, an expansion heater, a generator, a carbon dioxide injection pipe, an orifice pipe, a packer, a downhole temperature and pressure sensor and a horizontal well screen pipe. The wind power generation unit and the solar power generation unit are connected to the compressor through the rectifier to provide power to the compressor. The compressor is connected to the carbon dioxide manifold. The compressor is used to compress the carbon dioxide gas input by the carbon dioxide manifold. The high-pressure carbon dioxide storage tank is connected to the compressor, the heater is connected to the carbon dioxide storage tank, a first switch valve is arranged between the heater and the carbon dioxide storage tank, the heater is connected to the carbon dioxide injection pipe, and the heater is connected to the carbon dioxide A second switch valve is arranged between the carbon injection pipes, a pressure sensor and a temperature sensor are arranged between the second switch valve and the heater, the expansion heater is connected to the carbon dioxide injection pipe, the expansion heater and the heater are in parallel, a third switch valve is arranged between the expansion heater and the carbon dioxide injection pipe, the expansion heater is connected to the generator, the generator is connected to the carbon dioxide manifold, the carbon dioxide injection pipe passes through the salt water layer and extends into the salt water layer from the covering layer and the impermeable layer, an orifice pipe is arranged outside the carbon dioxide injection pipe, the orifice pipe is arranged on the salt water layer from the covering layer, a packer is arranged outside the carbon dioxide injection pipe, the packer is arranged in the upper impermeable layer, a downhole temperature and pressure sensor is arranged outside the carbon dioxide injection pipe, the downhole temperature and pressure sensor is arranged in the salt water layer, the bottom of the carbon dioxide injection pipe is connected to the horizontal well screen pipe, and the horizontal well screen pipe is arranged in the salt water layer;

[0006] The underground salt water extraction system comprises a sand control pipe, an electric submersible pump, a liquid level gauge, an outer casing, a water pumping pipe, a fourth switch valve, a water storage tank, a fifth switch valve, an injection pump and a sixth switch valve. The sand control pipe passes through the salt water layer and extends into the salt water layer through the covering layer and the aquiclude. The electric submersible pump is arranged in the sand control pipe, and the electric submersible pump is located in the salt water layer. The bottom of the outer casing is connected to the sand control pipe, and the upper part of the outer casing is connected to the injection pump. The injection pump is connected to the water storage tank. The sixth switch valve is arranged between the outer casing and the injection pump, and the fifth switch valve is arranged between the injection pump and the water storage tank. The electric submersible pump is connected to the water storage tank through the water pumping pipe, and the fourth switch valve is arranged between the water pumping pipe and the water storage tank. The liquid level gauge is installed on the outer side of one end of the water pumping pipe close to the electric submersible pump.

[0007] The carbon dioxide storage and energy storage system and the underground salt water extraction system form a well network in the form of concentric circle radiation or strip extension;

[0008] A carbon dioxide storage and energy storage method based on a well pattern mode comprises the following steps:

[0009] S1; When storing carbon dioxide in the saline layer, the electric energy generated by the wind power generation unit and the solar power generation unit is processed by the rectifier to drive the compressor to compress the carbon dioxide in the carbon dioxide manifold and store it in the high-pressure carbon dioxide storage tank. At this time, the first switch valve and the second switch valve need to be opened, and the third switch valve needs to be closed. The high-pressure carbon dioxide is heated by the heater to form supercritical carbon dioxide, and then flows through the carbon dioxide injection pipe and the horizontal well screen pipe in sequence, and finally injected into the saline layer. The pressure sensor, temperature sensor and downhole temperature and pressure sensor are used to monitor the state of supercritical carbon dioxide on the surface and underground;

[0010] S2; while injecting supercritical carbon dioxide into the saline layer, start the electric submersible pump to store the underground saline water flowing through the vertical well sand control pipe into the water storage tank through the pumping pipe, then open the fourth switch valve, close the fifth switch valve and the sixth switch valve, and during the pumping process, monitor the groundwater level in the vertical well through a liquid level meter. Pumping water from the vertical well will form a drop funnel in the saline layer, which is convenient for increasing the storage capacity and efficiency of supercritical carbon dioxide in the saline layer;

[0011] S3; After the supercritical carbon dioxide storage is completed, the first switch valve and the second switch valve are closed when needed, and the third switch valve is opened. The carbon dioxide flows from the saline layer through the horizontal well screen and the carbon dioxide injection pipe, generates electricity through the expansion heater and the generator, and finally the carbon dioxide flows back to the carbon dioxide manifold again. During the carbon dioxide release and power generation process, the fourth switch valve is closed, and the fifth switch valve and the sixth switch valve are opened. The salt water in the water storage tank is injected into the annular gap between the outer casing and the pumping pipe through the injection pump, and finally enters the saline layer, accelerating the return of carbon dioxide gas to generate electricity.

[0012] Beneficial effects of the present invention:

[0013] 1 The present invention proposes a storage and energy storage system of supercritical carbon dioxide "horizontal well network + vertical well pumping". When carbon dioxide is injected into the horizontal well, the pumping of water through the vertical well can reduce the carbon dioxide injection resistance and improve the injection efficiency of the saline layer; when carbon dioxide is released for power generation, the pumped groundwater is injected into the saline layer through the vertical well, which helps to speed up the power generation of carbon dioxide. In addition, the underground saline water is recycled in this process without other chemical additives, and the ecological environment of the area is not affected.

[0014] 2 Compared with vertical wells, the constructed supercritical carbon dioxide horizontal well storage mode effectively increases the storage range of carbon dioxide and greatly increases the storage capacity of carbon dioxide. In addition, according to the spatial distribution of the saline layer, a well network can be formed in the form of concentric circle radiation or strip extension to realize a regional carbon dioxide storage and energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a system diagram of the carbon dioxide storage and energy storage system and the underground salt water extraction system of the present invention;

[0016] Figure 2 Plan view of the well network layout of the carbon dioxide storage and energy storage system and the underground salt water extraction system (a. concentric circle radial well network; b. strip extension well network).

[0017] 1. Wind power generation unit; 2. Solar power generation unit; 3. Rectifier; 4. Carbon dioxide manifold; 5. Compressor; 6. High-pressure carbon dioxide storage tank; 7. First switch valve; 8. Heater; 9. Pressure sensor; 10. Temperature sensor; 11. Second switch valve; 12. Third switch valve; 13. Expansion heater; 14. Generator; 15. Carbon dioxide injection pipe; 16. Orifice pipe; 17. Cover layer; 18. Waterproof layer; 19. Saline layer; 20. Packer; 21. Downhole temperature and pressure sensor; 22. Horizontal well screen; 23. Vertical well sand control pipe; 24. Submersible pump; 25. Liquid level meter; 26. Outer casing; 27. Pumping pipe; 28. Fourth switch valve; 29. ​​Water storage tank; 30. Fifth switch valve; 31. Injection pump; 32. Sixth switch valve. DETAILED DESCRIPTION

[0018] See also Figure 1 and Figure 2 As shown, a carbon dioxide storage and energy storage system based on a well pattern mode includes a carbon dioxide storage and energy storage system 34 and an underground salt water extraction system 35, and the carbon dioxide storage and energy storage system 34 and the underground salt water extraction system 35 together form a circulation system;

[0019] The carbon dioxide storage and energy storage system includes a wind power generation unit 1, a solar power generation unit 2, a rectifier 3, a carbon dioxide manifold 4, a compressor 5, a high-pressure carbon dioxide storage tank 6, a first switch valve 7, a heater 8, a pressure sensor 9, a temperature sensor 10, a second switch valve 11, a third switch valve 12, an expansion heater 13, a generator 14, a carbon dioxide injection pipe 15, an orifice pipe 16, a packer 20, a downhole temperature and pressure sensor 21 and a horizontal well screen pipe 22. The wind power generation unit 1 and the solar power generation unit 2 are connected to the compressor 5 through the rectifier 3 to provide power to the compressor 5. The compressor 5 is connected to the carbon dioxide manifold 4. The compressor 5 is used to compress the carbon dioxide gas input by the carbon dioxide manifold 4. The high-pressure carbon dioxide storage tank 6 is connected to the compressor 5. The heater 8 is connected to the carbon dioxide storage tank 6. The first switch valve 7 is arranged between the heater 8 and the carbon dioxide storage tank 6. The heater 8 is connected to the carbon dioxide injection pipe 15. There is a A second switch valve 11, a pressure sensor 9 and a temperature sensor 10 are arranged between the second switch valve 11 and the heater 8, an expansion heater 13 is connected to a carbon dioxide injection pipe 15, the expansion heater 13 and the heater 8 are in parallel relationship, a third switch valve 12 is arranged between the expansion heater 13 and the carbon dioxide injection pipe 15, the expansion heater 13 is connected to a generator 14, the generator 14 is connected to a carbon dioxide manifold 4, the carbon dioxide injection pipe 15 passes through the saline layer from the cover layer 17 and the waterproof layer 18 to the saline layer 19, an orifice pipe 16 is arranged outside the carbon dioxide injection pipe 15, the orifice pipe 16 is arranged on the saline layer from the cover layer 17, a packer 20 is arranged outside the carbon dioxide injection pipe 15, the packer 20 is arranged in the upper waterproof layer 18, a downhole temperature and pressure sensor 21 is arranged outside the carbon dioxide injection pipe 15, the downhole temperature and pressure sensor 21 is arranged in the saline layer 19, the bottom of the carbon dioxide injection pipe 15 is connected to a horizontal well screen pipe 22, and the horizontal well screen pipe 22 is arranged in the saline layer 19;

[0020] Specifically, the packer 20 is installed in the upper water-proof layer 18 to prevent the stored carbon dioxide from leaking, the orifice pipe 16 is used to protect the stability of the wellhead on the surface of the horizontal well, the pressure sensor 9 and the temperature sensor 10 are installed on the pipeline between the heater 8 and the second switch valve 11, and the downhole temperature and pressure sensor 21 is arranged on the outside of the carbon dioxide injection pipe 15 at the lower end of the packer 20. The lower end of the injection pipe 15 is embedded in the horizontal well screen pipe 22 to facilitate the diffusion of carbon dioxide in the saline layer 19;

[0021] The underground salt water extraction system includes a sand control pipe 23, an electric submersible pump 24, a liquid level meter 25, an outer casing 26, a pumping pipe 27, a fourth switch valve 28, a water storage tank 29, a fifth switch valve 30, an injection pump 31 and a sixth switch valve 32. The sand control pipe 23 passes through the salt water layer and extends into the salt water layer 19 through the cover layer 17 and the waterproof layer 18. The electric submersible pump 24 is arranged in the sand control pipe 23, and the electric submersible pump 24 is located in the salt water layer 19. The bottom of the outer casing 26 is connected to the sand control pipe 23. The upper part of the outer casing 26 is connected with the injection pump 31, and the injection pump 31 is connected with the water storage tank 29. A sixth switch valve 32 is provided between the outer casing 26 and the injection pump 31, and a fifth switch valve 30 is provided between the injection pump 31 and the water storage tank 29. The electric submersible pump 24 is connected with the water storage tank 29 through a pumping pipe 27, and a fourth switch valve 28 is provided between the pumping pipe 27 and the water storage tank 29. A liquid level gauge 25 is installed on the outer side of one end of the pumping pipe 27 close to the electric submersible pump 24;

[0022] Specifically, the liquid level meter 25 is installed at the upper end of the electric submersible pump 24 to detect the groundwater level.

[0023] The carbon dioxide storage and energy storage system 34 and the underground salt water extraction system 35 form a well network in the form of concentric circle radiation or strip extension;

[0024] Specifically, the carbon dioxide storage and energy storage system 34 and the underground salt water extraction system 35 form a well network in the form of concentric circle radiation or strip extension, so as to increase the storage capacity of carbon dioxide in the salt water layer and realize a regional carbon dioxide storage and energy storage system;

[0025] A carbon dioxide storage and energy storage method based on a well pattern mode comprises the following steps:

[0026] S1; when storing carbon dioxide in the saline layer, the electric energy generated by the wind power generation unit 1 and the solar power generation unit 2 is processed by the rectifier 3 to drive the compressor 5 to compress the carbon dioxide in the carbon dioxide manifold 4 and store it in the high-pressure carbon dioxide storage tank 6. At this time, it is necessary to open the first switch valve 7 and the second switch valve 11, and close the third switch valve 12. The high-pressure carbon dioxide is heated by the heater 8 to form supercritical carbon dioxide, and then flows through the carbon dioxide injection pipe 15 and the horizontal well screen pipe 22 in sequence, and finally injected into the saline layer 19, wherein the pressure sensor 9, the temperature sensor 10 and the downhole temperature and pressure sensor 21 are used to monitor the state of the supercritical carbon dioxide on the surface and underground;

[0027] S2; while injecting supercritical carbon dioxide into the saline layer, start the electric submersible pump 24, and store the underground saline water flowing through the vertical well sand control pipe 23 into the water storage tank 29 through the pumping pipe 27. At this time, open the fourth switch valve 28, close the fifth switch valve 30 and the sixth switch valve 32. During the pumping process, the groundwater level in the vertical well is monitored by the liquid level meter 25. Pumping water from the vertical well will form a drop funnel in the saline layer, which is convenient for increasing the storage capacity and efficiency of supercritical carbon dioxide in the saline layer;

[0028] S3; After the supercritical carbon dioxide storage is completed, the first switch valve 7 and the second switch valve 11 are closed when necessary, and the third switch valve 12 is opened. The carbon dioxide flows from the saline layer 19 through the horizontal well screen 22 and the carbon dioxide injection pipe 15, and generates electricity through the expansion heater 13 and the generator 14. Finally, the carbon dioxide flows back to the carbon dioxide manifold 4 again. During the carbon dioxide release and power generation process, the fourth switch valve 28 is closed, the fifth switch valve 30 and the sixth switch valve 32 are opened, and the salt water in the water storage tank 29 is injected into the annular gap between the outer casing 26 and the pumping pipe 27 through the injection pump 31, and finally enters the saline layer 19, accelerating the return of carbon dioxide gas to generate electricity.

Claims

1. A carbon dioxide storage and energy storage system based on a well pattern, characterized by: It includes a carbon dioxide storage and energy storage system (34) and an underground salt water extraction system (33), wherein the carbon dioxide storage and energy storage system (34) and the underground salt water extraction system (33) together form a circulation system; The carbon dioxide storage and energy storage system (34) comprises a wind power generation unit (1), a solar power generation unit (2), a rectifier (3), a carbon dioxide manifold (4), a compressor (5), a high-pressure carbon dioxide storage tank (6), a first switch valve (7), a heater (8), a pressure sensor (9), a temperature sensor (10), a second switch valve (11), a third switch valve (12), an expansion heater (13), a generator (14), a carbon dioxide injection pipe (15), an orifice pipe (16), a packer (20), a downhole temperature and pressure sensor (21) and a horizontal well screen pipe (22). The element (1) and the solar power generation unit (2) are connected to a compressor (5) through a rectifier (3) to provide electric energy for the compressor (5). The compressor (5) is connected to a carbon dioxide manifold (4). The compressor (5) is used to compress the carbon dioxide gas input from the carbon dioxide manifold (4). The high-pressure carbon dioxide storage tank (6) is connected to the compressor (5). The heater (8) is connected to the carbon dioxide storage tank (6). A first switch valve (7) is provided between the heater (8) and the carbon dioxide storage tank (6). The heater (8) is connected to a carbon dioxide injection pipe (15). A second switch valve (11) is arranged between the second switch valve (11) and the heater (8), a pressure sensor (9) and a temperature sensor (10) are arranged between the second switch valve (11) and the heater (8), the expansion heater (13) is connected to the carbon dioxide injection pipe (15), the expansion heater (13) and the heater (8) are in parallel relationship, a third switch valve (12) is arranged between the expansion heater (13) and the carbon dioxide injection pipe (15), the expansion heater (13) is connected to the generator (14), the generator (14) is connected to the carbon dioxide manifold (4), the carbon dioxide injection pipe (15) passes through the salt water layer and is connected to the cover layer (17) and the aquiclude (18) extends into the saline water layer (19), an orifice pipe (16) is arranged outside the carbon dioxide injection pipe (15), the orifice pipe (16) is arranged on the cover layer (17) of the saline water layer, a packer (20) is arranged outside the carbon dioxide injection pipe (15), the packer (20) is arranged in the upper water-proof layer (18), a downhole temperature and pressure sensor (21) is arranged outside the carbon dioxide injection pipe (15), the downhole temperature and pressure sensor (21) is arranged in the saline water layer (19), the bottom of the carbon dioxide injection pipe (15) is connected to the horizontal well screen pipe (22), and the horizontal well screen pipe (22) is arranged in the saline water layer (19); The underground salt water extraction system (33) comprises a sand control pipe (23), an electric submersible pump (24), a liquid level meter (25), an outer casing (26), a pumping pipe (27), a fourth switch valve (28), a water storage tank (29), a fifth switch valve (30), an injection pump (31) and a sixth switch valve (32). The sand control pipe (23) passes through the salt water layer and extends from the cover layer (17) and the waterproof layer (18) into the salt water layer (19). The electric submersible pump (24) is arranged in the sand control pipe (23), and the electric submersible pump (24) is located in the salt water layer (19). The bottom of the outer casing (26) is connected to the sand control pipe (23). The outer casing (26) is connected to the water storage tank (23), the upper part of the outer casing (26) is connected to the injection pump (31), the injection pump (31) is connected to the water storage tank (29), a sixth switch valve (32) is arranged between the outer casing (26) and the injection pump (31), a fifth switch valve (30) is arranged between the injection pump (31) and the water storage tank (29), the electric submersible pump (24) is connected to the water storage tank (29) through a water pumping pipe (27), a fourth switch valve (28) is arranged between the water pumping pipe (27) and the water storage tank (29), and a liquid level meter (25) is installed on the outer side of one end of the water pumping pipe (27) close to the electric submersible pump (24).

2. A carbon dioxide storage and energy storage system based on a well pattern mode according to claim 1, characterized in that: The carbon dioxide storage and energy storage system (34) and the underground salt water extraction system (33) form a well network in the form of concentric circle radiation or strip extension.

3. A method for storing and storing carbon dioxide and energy based on a well pattern pattern based on a carbon dioxide storage and energy storage system according to any one of claims 1 or 2, characterized in that: The following steps are involved: S1; when storing carbon dioxide in a saline layer, the electric energy generated by the wind power generation unit (1) and the solar power generation unit (2) is processed by the rectifier (3) to drive the compressor (5) to compress the carbon dioxide in the carbon dioxide manifold (4) and store it in the high-pressure carbon dioxide storage tank (6). At this time, it is necessary to open the first switch valve (7) and the second switch valve (11), and close the third switch valve (12). The high-pressure carbon dioxide is heated by the heater (8) to form supercritical carbon dioxide, and then flows through the carbon dioxide injection pipe (15) and the horizontal well screen pipe (22) in sequence, and finally injected into the saline layer (19). The pressure sensor (9), the temperature sensor (10) and the downhole temperature and pressure sensor (21) are used to monitor the state of the supercritical carbon dioxide on the surface and underground. S2: while injecting supercritical carbon dioxide into the saline layer, the electric submersible pump (24) is turned on to store the underground saline water flowing through the vertical well sand control pipe (23) in the water storage tank (29) through the pumping pipe (27). At this time, the fourth switch valve (28) is opened, and the fifth switch valve (30) and the sixth switch valve (32) are closed. During the pumping process, the groundwater level in the vertical well is monitored by the liquid level meter (25). Pumping water from the vertical well will form a drop funnel in the saline layer, which is convenient for increasing the storage capacity and efficiency of supercritical carbon dioxide in the saline layer. S3; After the supercritical carbon dioxide storage is completed, the first switch valve (7) and the second switch valve (11) are closed when necessary, and the third switch valve (12) is opened. The carbon dioxide flows from the saline layer (19) through the horizontal well screen (22) and the carbon dioxide injection pipe (15), and generates electrical energy through the expansion heater (13) and the generator (14). Finally, the carbon dioxide flows back to the carbon dioxide manifold (4). During the carbon dioxide release and power generation process, the fourth switch valve (28) is closed, the fifth switch valve (30) and the sixth switch valve (32) are opened, and the salt water in the water storage tank (29) is injected into the annular gap between the outer casing (26) and the pumping pipe (27) through the injection pump (31), and finally enters the saline layer (19), thereby accelerating the return of carbon dioxide gas to generate electricity.

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