A new energy consumption method based on an electrothermal molten salt energy storage steam injection system

Abstract

The present application belongs to the field of oil and gas field ground engineering, and discloses a new energy consumption method based on an electrically heated molten salt energy storage steam injection system. The method comprises obtaining real-time power data and predicted power data of photovoltaic and wind power generation, accessing the data to a molten salt electric heater control system, judging whether grid valley time electricity needs to be supplemented and performing corresponding processing, judging whether the existing power of the grid can achieve new energy consumption and performing corresponding processing, and can realize exploitation after new energy consumption. Compared with conventional technology, the present application has a great cost advantage. When the wind and light new energy generation capacity is strong, the green electricity generated by wind and light can be fully utilized to heat the molten salt without consuming grid electricity. At the same time, the carbon emission intensity of the heavy oil thermal recovery process can be effectively reduced, and the green transformation of heavy oil production is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas field surface engineering, and specifically relates to a new energy consumption method based on an electrothermal molten salt energy storage and steam injection system. Background Technology

[0003] The efficient utilization of renewable energy sources such as wind power and photovoltaic power generation must be accompanied by a certain proportion of energy storage systems. Energy storage systems convert the green electricity generated by wind and solar power into mechanical energy, chemical energy or thermal energy and store it. During peak electricity demand or periods without wind and solar power, the stored energy is released to achieve the effect of "peak shaving and valley filling".

[0004] Heavy oil resources account for 70% of the world's remaining oil resources, making it an important replacement for global oil resources. my country has a wide distribution of heavy oil resources, with more than 70 heavy oil fields discovered in 12 basins. Currently, four major heavy oil production areas have been established in Liaohe, Xinjiang, Shengli, and Henan, with an annual oil production of 10 million tons.

[0005] Currently, heavy oil extraction is primarily achieved through thermal extraction, including steam injection, steam drive, SAGD, and VHSD. Heavy oil steam injection thermal recovery requires a large volume of steam and has a high carbon emission intensity, making it a key energy-consuming process. The steam injected in traditional heavy oil extraction processes is produced by burning fossil fuels (coal, oil, and natural gas), resulting in high energy consumption. Therefore, alternative solutions for traditional heavy oil steam injection systems are urgently needed to reduce carbon emissions.

[0006] Combining heavy oil steam injection thermal recovery with molten salt thermal storage technology is an efficient and feasible approach. Current molten salt energy storage technology primarily stores thermal or electrical energy in molten salt, using the stored thermal energy to generate steam to drive a turbine for power generation when needed. However, this approach suffers from significant losses during the steam-driven turbine process, resulting in low conversion efficiency, with an overall efficiency of approximately 35%. Summary of the Invention

[0007] To overcome the shortcomings of existing technologies, this invention provides a new energy consumption method based on an electrothermal molten salt energy storage steam injection system, aiming to solve the problem of mismatch between the power regulation of electric heating equipment in binary nitrate molten salt thermal energy storage systems and the power generation of new energy.

[0008] The above-mentioned objective of this invention is achieved through the following technical solution: a method for the consumption of new energy based on an electrothermal molten salt energy storage and steam injection system, comprising the following steps:

[0009] 1. Obtain real-time and predicted power data for photovoltaic and wind power generation;

[0010] 2. The data processed in step 1 is then fed into the molten salt electric heater control system;

[0011] 3. Determine if off-peak electricity supplementation is needed and take appropriate action;

[0012] 4. Determine whether the existing power capacity of the power grid can accommodate new energy sources and take appropriate measures accordingly;

[0013] 5. Heavy oil extraction can be carried out after the new energy source is consumed.

[0014] Furthermore, the real-time power data and predicted power data of photovoltaic and wind power generation in step 1 are obtained through the centralized monitoring and control system for photovoltaic and wind power generation.

[0015] Furthermore, in step 2, the molten salt electric heater control system is equipped with an electric heating device that can be infinitely adjusted within a large range.

[0016] Furthermore, step 2 specifically involves: after the data processing in step 1 is completed, it is connected to the molten salt electric heater control system, and the molten salt electric heater adjusts the heating power according to the real-time power of wind and solar power generation.

[0017] Furthermore, step 3 involves determining whether the power generated by wind and solar power can meet the process heat storage requirements, and then determining whether grid off-peak electricity supplementation is needed.

[0018] Furthermore, the specific processing procedure in step 3 is as follows: if the power generated by wind and solar power cannot meet the process heat storage requirements, then the off-peak electricity of the power grid is used as a supplement, that is, the off-peak electricity of the power grid is used to heat the molten salt as a supplement; if the power generated by wind and solar power meets the process heat storage requirements, then the green electricity of wind and solar power is used to heat the molten salt.

[0019] Furthermore, step 4 specifically involves: when the existing power of the power grid can achieve the absorption of new energy, the new energy power generation is directly absorbed by the power grid; when the existing power of the power grid cannot achieve the absorption of new energy, the power is calculated and adjusted in the molten salt electric heater power regulation system until the absorption of new energy can be achieved.

[0020] Furthermore, the calculated power includes the surplus power of new energy power generation and the power of the molten salt energy storage device.

[0021] Furthermore, step 5 specifically involves using a steam generator to exchange heat between high-temperature molten salt and water to produce steam for heavy oil steam injection extraction.

[0022] In a further preferred embodiment of the present invention, step 5 specifically involves: using an electrothermal molten salt energy storage system to absorb new energy sources, and then releasing the thermal energy stored in the high-temperature molten salt to produce steam for heavy oil steam injection extraction.

[0023] The beneficial effects of this invention compared with the prior art are as follows: Compared with the conventional technical route of using off-peak electricity to heat molten salt for thermal storage, this invention has a significant cost advantage. When the power generation capacity of new energy sources such as wind and solar is strong, it can realize the complete use of green electricity generated by wind and solar to heat molten salt without consuming grid electricity. At the same time, it can effectively reduce the carbon emission intensity of heavy oil thermal recovery process and help the green transformation of heavy oil production. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 This is a flowchart illustrating steps 1-3 of the new energy consumption method based on the electrothermal molten salt energy storage and steam injection system of the present invention.

[0026] Figure 2 This is a schematic diagram of step 4 of the new energy consumption method based on the electrothermal molten salt energy storage and steam injection system of the present invention. Detailed Implementation

[0027] The present invention is described in detail below through specific embodiments, but this does not limit the scope of protection of the present invention. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can all be obtained commercially.

[0028] Example 1

[0029] A method for new energy consumption based on an electrothermal molten salt energy storage and steam injection system includes the following steps:

[0030] 1. Obtain real-time and predicted power data for photovoltaic and wind power generation through a centralized monitoring and control system for photovoltaic and wind power generation;

[0031] 2. After the data processing in step 1 is completed, it is connected to the molten salt electric heater control system. The molten salt electric heater adjusts the heating power according to the real-time power of wind and solar power generation. The molten salt electric heater control system is equipped with an electric heating device that can be steplessly adjusted within a large range.

[0032] 3. By determining whether the power generated by wind and solar power can meet the process heat storage requirements, it can be determined whether the grid off-peak electricity is needed for supplementation. If the power generated by wind and solar power cannot meet the process heat storage requirements, the grid off-peak electricity is used as a supplement, that is, the grid off-peak electricity is used to heat the molten salt as a supplement. If the power generated by wind and solar power meets the process heat storage requirements, the green electricity from wind and solar power is used to heat the molten salt.

[0033] 4. Determine whether the existing power of the power grid can achieve the absorption of new energy. If the existing power of the power grid can achieve the absorption of new energy, the new energy power generation is directly absorbed by the power grid. If the existing power of the power grid cannot achieve the absorption of new energy, calculate the remaining power of new energy power generation and the input power of the molten salt energy storage device, and adjust it in the molten salt electric heater power regulation system until the absorption of new energy can be achieved.

[0034] 5. It can realize the production of steam for heavy oil steam injection after the new energy is consumed and the steam generator exchanges heat with water.

[0035] Example 2

[0036] After achieving the goal of absorbing new energy sources:

[0037] 1. Wind and solar power, after being stepped up, are transmitted through the power grid to the molten salt energy storage station to supply power to the molten salt electric heater;

[0038] 2. The real-time power of wind and solar power generation is transmitted to the molten salt electric heater power regulation system through the centralized monitoring and control system for wind and solar power generation. The molten salt electric heater power regulation system adjusts the operating power of the molten salt electric heater according to the wind and solar power generation curve.

[0039] 3. If the power generated by wind and solar power cannot meet the thermal storage requirements of the process, then off-peak grid power will be used as a supplement.

[0040] 4. After the molten salt thermal storage is completed, a steam generator is used to exchange heat between the high-temperature molten salt and water to produce steam for heavy oil steam injection extraction.

[0041] The embodiments described above are merely preferred embodiments of the present invention, and not all feasible embodiments of the present invention. Any obvious modifications made by those skilled in the art without departing from the principles and spirit of the present invention should be considered to be included within the scope of protection of the claims of the present invention.

Claims

1. A method for new energy consumption based on an electrothermal molten salt energy storage and steam injection system, characterized in that, The steps are as follows: S1. Obtain real-time power data and predicted power data for photovoltaic and wind power generation; S2. The data from step S1 is input into the molten salt electric heater control system; S3. Determine whether off-peak electricity replenishment is needed and take appropriate action; S4. Determine whether the existing power of the power grid can accommodate new energy sources and take appropriate measures accordingly; S5. It can enable the extraction of heavy oil after the consumption of new energy sources.

2. The method for new energy consumption based on an electrothermal molten salt energy storage and steam injection system according to claim 1, characterized in that, The real-time power data and predicted power data of photovoltaic and wind power generation in step S1 are obtained through the centralized monitoring and control system for photovoltaic and wind power generation.

3. The method for new energy consumption based on an electrothermal molten salt energy storage and steam injection system according to claim 1, characterized in that, In step S2, the molten salt electric heater control system is equipped with an electric heating device that can be infinitely adjusted within a large range.

4. The method for new energy consumption based on an electrothermal molten salt energy storage and steam injection system according to claim 1, characterized in that, Specifically, step S2 involves the following steps: after data processing in step S1, the data is connected to the molten salt electric heater control system, and the molten salt electric heater adjusts its heating power according to the real-time power of wind and solar power generation.

5. The method for new energy consumption based on an electrothermal molten salt energy storage and steam injection system according to claim 1, characterized in that, Step S3 involves determining whether the power generated by wind and solar power can meet the process heat storage requirements, and then determining whether grid off-peak electricity supplementation is needed.

6. The method for new energy consumption based on an electrothermal molten salt energy storage and steam injection system according to claim 1, characterized in that, The specific processing procedure of step S3 is as follows: if the power generated by wind and solar power cannot meet the heat storage requirements of the process, then the off-peak electricity of the power grid is used as a supplement, that is, the off-peak electricity of the power grid is used to heat the molten salt as a supplement. If the power generated by wind and solar power meets the heat storage requirements of the process, then the green electricity of wind and solar power is used to heat the molten salt.

7. The method for new energy consumption based on an electrothermal molten salt energy storage and steam injection system according to claim 1, characterized in that, Specifically, step S4 is as follows: when the existing power of the power grid can achieve the absorption of new energy, the new energy power generation is directly absorbed by the power grid; when the existing power of the power grid cannot achieve the absorption of new energy, the power is calculated and adjusted in the molten salt electric heater power regulation system until the absorption of new energy can be achieved.

8. The method for new energy consumption based on an electrothermal molten salt energy storage and steam injection system according to claim 7, characterized in that, The calculated power includes the surplus power of new energy power generation and the power put into operation by molten salt energy storage devices.

9. The method for new energy consumption based on an electrothermal molten salt energy storage and steam injection system according to claim 1, characterized in that, Specifically, step S5 involves using a steam generator to exchange heat with water to produce steam for steam injection mining of heavy oil.

10. The method for new energy consumption based on an electrothermal molten salt energy storage and steam injection system according to claim 9, characterized in that, Step S5 specifically involves: using an electrothermal molten salt energy storage system to absorb new energy sources, and then releasing the thermal energy stored in the high-temperature molten salt to produce steam for heavy oil steam injection extraction.

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