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Method for generating electricity by utilizing underground space pressurized water energy storage

An underground space and energy storage technology, which is applied in the method of container discharge, container filling method, and equipment loaded into pressure vessels, etc. effect of address range

Pending Publication Date: 2022-05-27
江苏国能石油天然气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for generating electricity by using pressurized water energy storage in underground space, which can solve the problem of mismatch between supply and demand of electric energy, and realize efficient storage, stable supply and full utilization of electric energy

Method used

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  • Method for generating electricity by utilizing underground space pressurized water energy storage
  • Method for generating electricity by utilizing underground space pressurized water energy storage
  • Method for generating electricity by utilizing underground space pressurized water energy storage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) In the rock salt mining area, there are two wells A and B from the salt cavern to the ground. The depth of the salt cavern in the lower part of Well A is 1810-1950m, and the depth of the salt cavern in the lower part of Well B is 1800-1940m. The salt cavern has a total volume of 800,000 cubic meters and is air-tight.

[0044] (2) In the two salt wells A and B, Φ244.5mm gas-tight casings were run respectively, among which the Φ244.5mm casing hole depth of A well was 1940m, and the Φ244.5mm casing hole depth of B well was 1930m.

[0045] (3) By analyzing the test results of in-situ stress, it is concluded that the fracture pressure of the layer where the salt cavern is located is 43.2MPa, the upper limit pressure after gas injection in the selected salt cavern is 24MPa, and the upper limit pressure after liquid injection into the salt cavern is 28MPa.

[0046] (4) Using a gas compressor, nitrogen is injected into the underground salt cavern space through the Φ244.5mm ...

Embodiment 2

[0052] (1) Select an underground cave, which is full of groundwater. The volume of the cave is 400,000 square meters, and its depth range is 1210-1350m, and it has air-tight conditions.

[0053] (2) Between the ground and the underground cave, run the concentric casing string, the combination of the pipe string is Φ244.5mm+Φ177.8mm, the bottom depth of the Φ244.5mm casing is 1325m, and the bottom depth of the Φ177.8mm casing is 1345m.

[0054] (3) By analyzing the test results of in-situ stress, it is concluded that the rupture pressure of the layer where the cave is located is 28.8MPa, the upper limit pressure after gas injection in the selected cave is 15.8MPa, and the upper limit pressure after liquid injection in the cave is 20MPa.

[0055] (4) Using a gas compressor, the air is injected into the underground cave through the casing annular space of Φ244.5mm and Φ177.8mm. When the pressure of the cave reaches 15.8MPa, the gas injection is stopped, the depth of the gas-liqu...

Embodiment 3

[0061] (1) In the oil and gas reservoir structural area, select an underground high-pressure storage body. There are two wells A and B in the storage body to the ground. The depth of the storage body in the lower part of Well A is 1810-1980 m, and the storage body in the lower part of Well B is in the range of 1810-1980 m. The depth range is 1960-2150m. The high-pressure storage space has a total volume of 900,000 cubic meters and is air-tight.

[0062] (2) In the two oil and gas wells A and B, Φ273mm gas-tight casings were run respectively, among which the Φ273mm casing hole depth of A well was 1940m, and the Φ273mm casing hole depth of B well was 2130m.

[0063] (3) By analyzing the test results of in-situ stress, it is concluded that the fracture pressure of the underground high pressure storage body formation is 43.4MPa, the upper limit pressure of the underground storage body after gas injection is 26MPa, and the upper limit pressure after liquid injection is 30MPa.

[0...

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Abstract

The invention relates to a method for energy storage and power generation by using underground space pressurized water, which comprises the following steps of: selecting a certain volume of underground confined space such as a salt cavern, establishing a connecting channel between the ground and the underground space, and storing gas in the underground confined space in advance; in the electric energy surplus time period, liquid is pressed into the underground space through electric water injection equipment; and in the peak period of power utilization, the liquid in the underground space is released, and the liquid with certain pressure drives the hydroelectric generating set to generate power. According to the gas compressible principle, the underground space is used for pressurized water energy storage power generation, the problems of mismatching of supply and demand of electric energy, new energy power generation absorption and the like are solved, and efficient storage, stable supply and full utilization of the electric energy can be achieved.

Description

technical field [0001] The invention relates to a method for utilizing the underground space such as a salt cave to pressurize water for energy storage and power generation, and belongs to the fields of high-efficiency storage of electric energy, stable supply and hydropower generation. Background technique [0002] Energy storage refers to the process of storing energy through media or equipment and releasing it when needed. Usually, energy storage mainly refers to electric energy storage. Energy storage can provide various services such as peak regulation, frequency regulation, backup, black start and demand response support for grid operation, and is an important means to improve the flexibility, economy and safety of traditional power systems. In addition, energy storage can also significantly improve the consumption level of new energy such as wind energy and solar energy, solve the randomness and volatility of new energy power generation, and enable intermittent, low-d...

Claims

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Application Information

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IPC IPC(8): F17C1/00F17C5/06F17C13/00F01K27/00
CPCF17C1/007F17C5/06F17C13/00F01K27/00F17C2201/052F17C2221/033F17C2223/0123F17C2227/0157F17C2265/07F17C2270/0144F17C2270/0152Y02E70/30
Inventor 刘正友刘凯
Owner 江苏国能石油天然气有限公司
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