CN114629169A - Waste underground space compressed air energy storage system and method - Google Patents
Waste underground space compressed air energy storage system and method Download PDFInfo
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- CN114629169A CN114629169A CN202210352737.4A CN202210352737A CN114629169A CN 114629169 A CN114629169 A CN 114629169A CN 202210352737 A CN202210352737 A CN 202210352737A CN 114629169 A CN114629169 A CN 114629169A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
Abstract
The invention provides a system and a method for storing compressed air in a waste underground space, wherein the system comprises the following steps: the acidizing pipe column is inserted into the shaft and is connected with the acidizing equipment; the wind power generation equipment and the photovoltaic power generation equipment are connected with an air compression system; the air compression system is communicated with the shaft through a high-pressure air supply pipeline; a turbine generator is arranged in the compressed air energy storage power station, an air inlet of the turbine generator is communicated with the shaft through a high-pressure exhaust pipeline, and an electric output end of the turbine generator is connected with a ground power grid. The method comprises the following steps: selecting a waste oil-gas well; acid injection and acidification operation; repeating the acidification operation; compressed air energy storage operation; releasing air to generate electricity; the circulating charging and discharging operation of compressed air and released air is carried out, so that the energy storage and power generation processes are flexibly and alternately carried out; the system and the method are beneficial to realizing the secondary utilization of the waste oil-gas well, can conveniently convert surplus electric energy into compressed air to be stored in the waste oil-gas well, and can release the compressed air to perform power generation operation when needed.
Description
Technical Field
The invention belongs to the technical field of resource recycling of waste underground spaces, and particularly relates to a compressed air energy storage system and method for a waste underground space.
Background
At present, the new energy power generation technology mainly based on wind power generation and photovoltaic power generation is influenced by factors such as seasons and weather, and the problems of fluctuation, randomness and other unstable work exist. The compressed air is used for converting the energy of the fluctuating electric energy and then storing the converted energy and outputting the stability in the later period, so that the peak clipping and valley filling of the power grid can be realized. The compressed air energy storage technology generally selects underground natural caves or waste salt caverns and the like as energy storage spaces, so that the construction cost is greatly reduced, and the effective utilization of space resources of waste mines and natural caves is realized. The conventional oil and gas reservoir is a rock stratum with high porosity and high permeability, the internal space of the rock stratum is high in connectivity and large in size, and the mobility and the diffusion speed of air are far higher than those of crude oil. The reservoir of the abandoned oil and gas well which is finished to be produced can be slightly modified to provide huge space for the storage of compressed air. One of the keys of the transformation of the oil and gas reservoir is how to efficiently increase the permeability and porosity of the reservoir to form a highly-communicated space network so as to increase the storage volume of compressed air and realize large-scale energy storage and efficient utilization of waste oil and gas wells. Under the circumstance, a new power generation technology needs to be developed to solve the technical problems of fluctuation and randomness existing in new energy power generation, and further improve new energy grid-connected friendliness and capacity supporting capacity.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a waste underground space compressed air energy storage system and a method, the system is beneficial to increasing the internal energy storage space of a waste oil-gas well, realizing the secondary utilization of the waste oil-gas well, reducing the construction cost of the energy storage space, and meanwhile, the system can be convenient for converting surplus electric energy generated by wind and solar power generation equipment into compressed air to be stored in the waste oil-gas well and releasing the compressed air to perform power generation operation when needed. The method has simple steps, can fully utilize underground waste space resources as energy storage space, and can greatly save the construction cost of the gas storage space; meanwhile, the technical problem of low utilization rate of new energy caused by unstable operation of wind and light generation can be solved, and the problem of grid connection consumption caused by wave mobility of wind and light generation can be solved.
In order to achieve the aim, the invention provides a waste underground space compressed air energy storage system, which comprises a waste oil-gas well, a ground power grid, wind power generation equipment, photovoltaic power generation equipment, acidification equipment, an acidification pipe column, an air compression system and a compressed air energy storage power station; a shaft communicated to a crude oil and gas reservoir is arranged in the waste oil and gas well;
the acidification device, the wind power generation device, the photovoltaic power generation device, the air compression system and the compressed air energy storage power station are all arranged on the ground;
the acidizing pipe column is inserted into the shaft and connected with acidizing equipment, and is used for conveying acid liquor into the shaft;
the wind power generation equipment and the photovoltaic power generation equipment are connected with the air compression system and supply power for the air compression system;
the air compression system is communicated with the shaft through a high-pressure air supply pipeline;
the compressed air energy storage power station is internally provided with a turbine generator, an air inlet of the turbine generator is communicated with a shaft through a high-pressure exhaust pipeline, and an electric output end of the turbine generator is connected with a ground power grid.
Further, in order to ensure that the service life of the acid injection pipe column is longer, the acid injection pipe column is strong acid resistant and high corrosion resistant.
Furthermore, in order to fully utilize the old resources and reduce the overall cost, the wind power generation equipment and the photovoltaic power generation equipment are both original equipment on the ground.
According to the invention, the acidizing pipe column is inserted into the shaft and connected with the acidizing equipment, so that acid liquor can be conveniently conveyed into the shaft, the acid liquor can be used for permeating pores to corrode and dissolve a rock stratum, and a seepage channel in a crude oil gas storage layer is improved, so that the purposes of increasing the energy storage space in the waste oil gas well and reducing the construction cost of the energy storage space are achieved. The wind power generation equipment and the photovoltaic power generation equipment are connected with the air compression system, so that surplus electric energy generated by the wind power generation equipment and the photovoltaic power generation equipment can be conveniently utilized to compress air; the air compression system is communicated with the shaft through the high-pressure air supply pipeline, so that compressed air can be conveniently injected into the waste oil-gas well; the turbine generator in the compressed air energy storage power station is communicated with the shaft through the high-pressure exhaust pipeline and is connected with the ground motor, when the efficiency of wind and electricity generating equipment is low, the compressed air can be used for driving the turbine generator to generate electricity, and the generated electric energy is connected into a ground power grid so as to achieve the effect of 'peak clipping and valley filling'. The system is favorable for realizing secondary utilization of the waste oil-gas well, can convert surplus electric energy generated by wind and light power generation equipment into compressed air conveniently, stores the compressed air in the waste oil-gas well, and can release the compressed air to perform power generation operation when the power generation efficiency of the wind and light power generation equipment is low.
The invention also provides a method for storing energy by compressed air in the waste underground space, which comprises the following steps:
the method comprises the following steps: preparing; selecting a waste oil-gas well meeting the condition of implementing compressed air energy storage according to original oil-gas reservoir geological parameters and pore permeability data; then arranging acidizing equipment on the ground, and putting an acid injection pipe column into the shaft; meanwhile, establishing the electrical connection between the wind power generation equipment and the photovoltaic power generation equipment and the air compression system, and establishing the electrical connection between a turbine generator in the compressed air energy storage power station and a ground power grid;
step two: acid injection and acidification; pumping and injecting acid liquor to the tail end of a shaft in the crude oil and gas reservoir through an acid injection pipe column, so that the acid liquor permeates into the crude oil and gas reservoir through the pores of the reservoir around the shaft, and corroding and dissolving part of rocks by utilizing the chemical reaction of the acid liquor and the rocks of the crude oil and gas reservoir so as to improve the volume and the permeability of the pores of the reservoir; when the pump injects acid liquor, the acid injection pipe column is upwards recovered according to a certain speed;
step three: repeatedly acidifying; after the primary acid injection is completed, repeating the second step after the acidification reaction is finished, and performing repeated acidification operation on the crude oil gas reservoir;
step four: compressing air to store energy; during the non-electricity-consumption peak, the surplus electric energy produced by the wind power generation equipment and the photovoltaic power generation equipment is utilized to drive the air compression system to work, air is compressed and injected into the transformed waste oil-gas well, and after the injection is finished, the compressed air injected into the well is subjected to high-pressure sealing, so that the sealing and energy storage operation is realized;
step five: releasing air to generate electricity: when the wind power generation equipment and the photovoltaic power generation equipment are low in power generation efficiency or in the peak time of power utilization, compressed air sealed in an underground reservoir is released, so that high-pressure air flows to the ground from the underground reservoir along with a pressure difference and flows into a turbine generator in a compressed air energy storage power station to push the turbine generator to generate power; connecting the stable electric energy subjected to energy conversion by the turbine generator into a ground power grid to continuously transmit the electric energy to residential areas;
step six: and (4) repeating the fourth step and the fifth step according to the actual conditions of power generation and power utilization, and performing cyclic charging and discharging operation of compressed air and released air so as to flexibly and alternately perform the energy storage and power generation processes.
Preferably, in the step one, the gas storage capacity in the underground reservoir of the abandoned oil and gas well is at least 105m3The above.
Further, in order to prolong the service life of the acid injection column, in the step one, the acid injection column is a strong acid resistant and high corrosion resistant column.
Further, in order to ensure that the acid liquor and the rock can react more fully, in the second step, the recovery speed of the acid injection pipe column is 0.6-1.2 m/s.
Preferably, in the second step, the acid solution is hydrochloric acid or hydrofluoric acid liquid.
Further, in order to fully increase the volume of the pores of the reservoir and ensure that more acid corrosion cracks can be formed around the shaft, so as to fully increase the energy storage space, in the third step, the second step is repeated for 5-8 times.
Further, in order to ensure that the storage pressure of the compressed air in the waste oil and gas well can be maintained within a set range, so that the energy conversion operation can be carried out more efficiently in the releasing power generation process, in the fourth step, the storage pressure of the compressed air is higher than the pore pressure of the stratum but lower than the fracture extension pressure of the stratum.
The invention firstly provides an innovative technical idea for reconstructing the energy storage space of the waste oil-gas well by adopting an acidification reconstruction mode. The acid liquor is pumped into the original oil and gas well through the acid liquor pipe column, so that the acid liquor permeates into pores to corrode and dissolve the rock stratum, seepage channels in the crude oil and gas reservoir are improved, the process is repeated for many times, the volume of the pores in the crude oil and gas reservoir can be remarkably improved through the contact reaction of the acid liquor and crude oil and gas reservoir rocks for many times, acid corrosion cracks can be formed around a shaft, and the energy storage space is further increased. The method of recovering the acid injection pipeline to inject the acid liquor into the shaft pump is adopted, so that the using amount of the acid liquor can be reduced, the acid liquor can be ensured to be fully contacted with an original reservoir, a reaction area can be increased rapidly, the acidification reaction efficiency is improved, and the acidification transformation is completed until an underground space. Therefore, the original oil and gas reservoir with high porosity and high permeability is subjected to reaming and permeability-increasing transformation in an acidification mode, the permeability and the pore volume of the reservoir are fully improved, the gas storage space is increased, and the gas storage capacity of the reservoir around the abandoned oil and gas well is further increased, so that a large enough effective utilization space is provided for storing compressed air. Secondly, the method takes the original oil and gas reservoir around the existing waste oil and gas well as an air storage space, and fully combines the compressed air energy storage with the secondary utilization of the waste oil and gas well. Because the rock stratum in the high-porosity and high-permeability crude oil gas reservoir has good connectivity and is a natural high-capacity gas storage, during the non-electricity-consumption peak, surplus electric energy produced by wind power generation equipment and photovoltaic power generation equipment is used as a power source to drive an air compression system to work, and air is compressed and injected into the acidized and transformed waste oil gas well and is sealed and stored. When the electricity consumption peak or the power generation efficiency of the wind power generation equipment and the photovoltaic power generation equipment is low, the compressed air is released to drive the turbine generator to generate power and is connected to a ground power grid. Therefore, the form of converting valley electricity, abandoned wind electricity and abandoned light electricity into compressed air can be effectively stored, and the compressed air can be released to perform power generation operation when wind and light power generation equipment is low in efficiency. The method not only realizes the secondary utilization of the waste oil-gas well, but also fully utilizes the underground space resources, and saves the construction cost of the gas storage space; meanwhile, the technical problem of low utilization rate of new energy caused by unstable operation of wind and light generation is effectively solved, and the problem of grid connection consumption caused by wave mobility of wind and light generation is solved.
Drawings
FIG. 1 is a schematic diagram of selected abandoned oil and gas wells in the process of the present invention;
FIG. 2 is a schematic diagram of the layout of the acidification device according to the invention;
FIG. 3 is a schematic diagram of pumping acid solution in the method of the present invention;
FIG. 4 is a partial enlarged view of portion A of FIG. 3;
FIG. 5 is a schematic representation of reservoir acidizing reformation in the process of the present invention;
FIG. 6 is a partial enlarged view of portion B of FIG. 5;
FIG. 7 is a schematic diagram of the process of storing energy in compressed air in the method of the present invention;
FIG. 8 is a schematic illustration of the process of generating electricity by releasing air in the process of the present invention;
fig. 9 is a schematic structural diagram of the whole compressed air energy storage system of the waste oil-gas well in the invention.
In the figure: 1. the system comprises a crude oil gas reservoir, 2, a shaft, 3, acidizing equipment, 4, acidizing pipe columns, 5, acidizing fluid, 6, reservoir pores, 7, acid corrosion cracks, 8, wind power generation equipment, 9, photovoltaic power generation equipment, 10, an air compression system, 11, air, 12, a compressed air energy storage power station, 13, a ground power grid, 14 and a residential area.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 to 9, the invention provides a waste underground space compressed air energy storage system, which comprises a waste oil-gas well, a ground power grid 13, a wind power generation device 8, a photovoltaic power generation device 9, an acidification device 3, an acidification pipe column 4, an air compression system 10 and a compressed air energy storage power station 12; a shaft 2 communicated to an original oil and gas reservoir 1 is arranged in the waste oil and gas well;
the acidification device 3, the wind power generation device 8, the photovoltaic power generation device 9, the air compression system 10 and the compressed air energy storage power station 12 are all arranged on the ground;
the acidizing pipe column 4 is inserted into the shaft 2, is connected with the acidizing equipment 3 and is used for conveying acid liquor 5 into the shaft 2;
the wind power generation equipment 8 and the photovoltaic power generation equipment 9 are both connected with an air compression system 10 and supply power for the air compression system 10;
the air compression system 10 is communicated with the shaft 2 through a high-pressure air supply pipeline;
the compressed air energy storage power station 12 is internally provided with a turbine generator, an air inlet of the turbine generator is communicated with the shaft 2 through a high-pressure exhaust pipeline, and an electric output end of the turbine generator is connected with a ground power grid 13.
In order to ensure that the acid injection column has a long service life, the acid injection column 4 is a strong acid resistant and high corrosion resistant column.
In order to fully utilize the old resources and reduce the overall cost, the wind power generation equipment 8 and the photovoltaic power generation equipment 9 are both original equipment on the ground.
According to the invention, the acidizing pipe column is inserted into the shaft and connected with the acidizing equipment, so that acid liquor can be conveniently pumped into the shaft, the acid liquor can be used for permeating pores to erode and dissolve a rock stratum, and a seepage channel in a crude oil gas storage layer is improved, so that the purposes of increasing the internal energy storage space of the waste oil gas well and reducing the construction cost of the energy storage space are achieved. The wind power generation equipment and the photovoltaic power generation equipment are connected with the air compression system, so that surplus electric energy generated by the wind power generation equipment and the photovoltaic power generation equipment can be conveniently utilized to compress air; the air compression system is communicated with the shaft through the high-pressure air supply pipeline, so that compressed air can be conveniently injected into the waste oil-gas well; the turbine generator in the compressed air energy storage power station is communicated with the shaft through the high-pressure exhaust pipeline and is connected with the ground motor, when the efficiency of wind and electricity generating equipment is low, the compressed air can be used for driving the turbine generator to generate electricity, and the generated electric energy is connected into a ground power grid so as to achieve the effect of 'peak clipping and valley filling'. The system is favorable for realizing secondary utilization of the waste oil-gas well, can convert surplus electric energy generated by wind and light power generation equipment into compressed air conveniently, stores the compressed air in the waste oil-gas well, and can release the compressed air to perform power generation operation when the power generation efficiency of the wind and light power generation equipment is low.
The invention also provides a method for storing energy by compressing air in the waste underground space, which comprises the following steps:
the method comprises the following steps: preparing; firstly, selecting a waste oil-gas well meeting the condition of implementing compressed air energy storage according to the geological parameters and the pore permeability data of an original oil-gas reservoir 1, as shown in figure 1; then arranging an acidification device 3 on the ground, as shown in figure 2, and putting an acid injection pipe column 4 into the shaft 2; meanwhile, establishing the electrical connection between the wind power generation equipment 8 and the photovoltaic power generation equipment 9 and the air compression system 10, and establishing the electrical connection between a turbine generator in the compressed air energy storage power station 12 and a ground power grid 13;
step two: acid injection and acidification; pumping and injecting an acid solution 5 into the end of a shaft 2 in the crude oil and gas reservoir 1 through an acid injection pipe column 4, so that the acid solution 5 permeates into the crude oil and gas reservoir 1 through reservoir pores 6 around the shaft 2, and corroding and dissolving part of rocks by utilizing a chemical reaction between the acid solution 5 and the rocks of the crude oil and gas reservoir 1 so as to improve the volume and the permeability of the reservoir pores 6; while pumping the acid solution 5, the acid injection pipe column 4 is upwards recovered at a certain speed;
step three: repeating acidification; after the primary acid injection is completed, repeating the second step after the acidification reaction is finished, and performing repeated acidification operation on the crude oil gas reservoir 1; as shown in fig. 4, under the multiple contact reaction of the acid liquor 5 and the rock of the original reservoir 1, the volume of the internal pores 6 of the crude oil and gas reservoir 1 is remarkably increased; by means of the mode that the acid injection pipeline 4 is recovered to inject the acid liquor 5 into the shaft 2 through a pump, the using amount of the acid liquor 5 can be reduced, the acid liquor 5 can be in full contact with the original reservoir 1, the reaction area is rapidly increased, the acidification reaction efficiency is improved, and acidification transformation is completed until underground space. After the acidizing transformation is completed, not only the volume of the reservoir pores 6 is increased, but also acid corrosion cracks 7 are formed around the shaft 2, so that the energy storage space is further increased;
step four: compressing air to store energy; as shown in fig. 5, during the non-electricity-consumption peak, the surplus electric energy produced by the wind power generation equipment 8 and the photovoltaic power generation equipment 9 is used for driving the air compression system 10 to work, air 11 is compressed and injected into the transformed waste oil-gas well, and after the injection is finished, the compressed air injected into the well is subjected to high-pressure sealing, so that the sealing and energy storage operation is realized;
step five: releasing air to generate electricity: when the power generation efficiency of the wind power generation equipment 8 and the photovoltaic power generation equipment 9 is low or the electricity consumption peak time is up, releasing the compressed air sealed in the underground reservoir, so that the high-pressure air 11 flows to the ground from the underground reservoir along with the pressure difference and flows into a turbine generator in the compressed air energy storage power station 12 to push the turbine generator to generate electricity; the stable electric energy which is subjected to energy conversion by the turbine generator is connected to a ground power grid 13 to continuously transmit the electric energy to a residential area 14;
step six: and (4) repeating the fourth step and the fifth step according to the actual conditions of power generation and power utilization, and performing circular charging and discharging operation of compressed air and released air 11 to flexibly and alternately perform the energy storage and power generation processes.
Preferably, in the step one, the gas storage capacity in the underground reservoir of the abandoned oil and gas well is at least 105m3The above.
In order to prolong the service life of the acid injection column, in the step one, the acid injection column 4 is a strong acid resistant and high corrosion resistant column.
In order to ensure that the acid liquor and the rock can react more fully, in the second step, the recovery speed of the acid injection pipe column 4 is 0.6-1.2 m/s.
Preferably, in the second step, the acid solution 5 is hydrochloric acid or hydrofluoric acid liquid.
In order to fully increase the volume of the pores of the reservoir and ensure that more acid-etched fractures can be formed around the shaft, so as to fully increase the energy storage space, in the third step, the second step is repeated for 5-8 times.
In order to ensure that the storage pressure of the compressed air in the waste oil and gas well can be maintained in a set range so as to more efficiently perform energy conversion operation in the process of releasing power generation, in the fourth step, the storage pressure of the compressed air is higher than the pore pressure of the stratum but lower than the fracture extension pressure of the stratum.
The invention firstly provides an innovative technical idea for reconstructing the energy storage space of the waste oil-gas well by adopting an acidification reconstruction mode. The acid liquor is pumped into the original oil and gas well through the acid liquor pipe column, so that the acid liquor permeates into pores to corrode and dissolve the rock stratum, seepage channels in the crude oil and gas reservoir are improved, the process is repeated for many times, the volume of the pores in the crude oil and gas reservoir can be remarkably improved through the contact reaction of the acid liquor and crude oil and gas reservoir rocks for many times, acid corrosion cracks can be formed around a shaft, and the energy storage space is further increased. The method of injecting acid liquor into the shaft pump by using the recovery acid injection pipeline can reduce the using amount of the acid liquor, ensure the sufficient contact of the acid liquor and the original reservoir, be beneficial to quickly increasing the reaction area and improving the acidification reaction efficiency until the underground space is acidified and reformed. Therefore, the original high-porosity and high-permeability oil and gas reservoir is subjected to reaming and permeability-increasing transformation in an acidification mode, the permeability and pore volume of the reservoir are fully improved, the gas storage space is increased, and the gas storage capacity of the reservoir around the abandoned oil and gas well is further increased, so that a large enough effective utilization space is provided for storing compressed air. Secondly, the method takes the original oil and gas reservoir around the existing waste oil and gas well as an air storage space, and fully combines the compressed air energy storage with the secondary utilization of the waste oil and gas well. Because the rock stratum in the high-porosity and high-permeability crude oil gas reservoir has good connectivity and is a natural high-capacity gas storage, during the non-electricity-consumption peak, surplus electric energy produced by wind power generation equipment and photovoltaic power generation equipment is used as a power source to drive an air compression system to work, and air is compressed and injected into the acidized and transformed waste oil gas well and is sealed and stored. When the electricity consumption peak or the power generation efficiency of the wind power generation equipment and the photovoltaic power generation equipment is low, the compressed air is released to drive the turbine generator to generate power and is connected to a ground power grid. Therefore, the form of converting valley electricity, abandoned wind electricity and abandoned light electricity into compressed air can be effectively stored, and the compressed air can be released to perform power generation operation when wind and light power generation equipment is low in efficiency. The method not only realizes the secondary utilization of the waste oil-gas well, but also fully utilizes the underground space resources, and saves the construction cost of the gas storage space; meanwhile, the technical problem of low utilization rate of new energy caused by unstable operation of wind and light generation is effectively solved, and the problem of grid connection consumption caused by wave mobility of wind and light generation is solved.
Claims (10)
1. A waste underground space compressed air energy storage system comprises a waste oil-gas well, a ground power grid (13), wind power generation equipment (8) and photovoltaic power generation equipment (9), wherein a shaft (2) communicated to an original oil-gas reservoir (1) is arranged in the waste oil-gas well; the system is characterized by also comprising an acidification device (3), an acidification pipe column (4), an air compression system (10) and a compressed air energy storage power station (12);
the acidification device (3), the wind power generation device (8), the photovoltaic power generation device (9), the air compression system (10) and the compressed air energy storage power station (12) are all arranged on the ground;
the acidizing pipe column (4) is inserted into the shaft (2), is connected with the acidizing equipment (3) and is used for conveying acid liquor (5) to the inside of the shaft (2);
the wind power generation equipment (8) and the photovoltaic power generation equipment (9) are both connected with the air compression system (10) and supply power for the air compression system (10);
the air compression system (10) is communicated with the shaft (2) through a high-pressure air supply pipeline;
the compressed air energy storage power station (12) is internally provided with a turbine generator, an air inlet of the turbine generator is communicated with the shaft (2) through a high-pressure exhaust pipeline, and an electric output end of the turbine generator is connected with a ground power grid (13).
2. A waste underground space compressed air energy storage system according to claim 1, characterized in that the acid injection pipe column (4) is a strong acid and high corrosion resistant pipe column.
3. A waste underground space compressed air energy storage system according to claim 1 or 2, wherein the wind power generation equipment (8) and the photovoltaic power generation equipment (9) are all original equipment on the ground.
4. The energy storage method for the compressed air in the waste underground space is characterized by comprising the following steps of:
the method comprises the following steps: preparing; selecting a waste oil-gas well meeting the condition of implementing compressed air energy storage according to the geological parameters and the pore permeability data of an original oil-gas reservoir (1); then, arranging an acidification device (3) on the ground, and putting an acid injection pipe column (4) into the shaft (2); meanwhile, establishing the electrical connection between the wind power generation equipment (8), the photovoltaic power generation equipment (9) and the air compression system (10), and establishing the electrical connection between a turbine generator in the compressed air energy storage power station (12) and a ground power grid (13);
step two: acid injection and acidification; pumping and injecting acid liquor (5) into the tail end of a shaft (2) in the crude oil and gas reservoir (1) through an acid injection pipe column (4), so that the acid liquor (5) permeates into the crude oil and gas reservoir (1) through reservoir pores (6) around the shaft (2), and corroding and dissolving part of rocks by utilizing chemical reaction of the acid liquor (5) and the rocks of the crude oil and gas reservoir (1) so as to improve the volume and the permeability of the reservoir pores (6); when the acid liquid (5) is injected by a pump, the acid injection pipe column (4) is upwards recovered at a certain speed;
step three: repeatedly acidifying; after the primary acid injection is completed, repeating the second step after the acidification reaction is finished, and performing repeated acidification operation on the crude oil gas reservoir (1);
step four: compressing air to store energy; during the non-electricity-consumption peak, the surplus electric energy produced by the wind power generation equipment (8) and the photovoltaic power generation equipment (9) is utilized to drive the air compression system (10) to work, the air (11) is compressed and injected into the transformed waste oil-gas well, and after the injection is finished, the compressed air injected into the well is subjected to high-pressure sealing, so that the sealing and energy storage operation is realized;
step five: releasing air to generate electricity: when the wind power generation equipment (8) and the photovoltaic power generation equipment (9) have low power generation efficiency or are in peak time of power utilization, releasing compressed air sealed in an underground reservoir, enabling high-pressure air (11) to flow to the ground from the underground reservoir along with pressure difference, and flowing into a turbine generator in a compressed air energy storage power station (12) to push the turbine generator to generate power; the stable electric energy which is subjected to energy conversion by the turbine generator is connected into a ground power grid (13) to continuously transmit electric energy for a residential area (14);
step six: and (4) repeating the fourth step and the fifth step according to the actual conditions of power generation and power utilization, and performing cyclic charging and discharging operation of compressed air and released air so as to flexibly and alternately perform the energy storage and power generation processes.
5. A method for storing energy by compressed air in waste underground space as claimed in claim 4, wherein in step one, the gas storage capacity in underground reservoir of waste oil and gas well is at least 105m3The above.
6. The method for storing energy of compressed air in a waste underground space as claimed in claim 5, wherein in the first step, the acid injection pipe column (4) is a strong acid and high corrosion resistant pipe column.
7. The energy storage method of the compressed air in the waste underground space as claimed in claim 6, wherein in the second step, the recovery speed of the acid injection column (4) is 0.6-1.2 m/s.
8. The method for storing energy of compressed air in waste underground space as claimed in claim 7, wherein in the second step, the acid solution (5) is hydrochloric acid or hydrofluoric acid liquid.
9. The method for storing energy of compressed air in a waste underground space as claimed in claim 8, wherein in the third step, the second step is repeated 5-8 times.
10. A method of storing energy as claimed in claim 9 wherein in step four the compressed air storage pressure is higher than the formation pore pressure but lower than the formation fracture propagation pressure.
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