Multi-energy complementary energy supply system and method for heavy oil thermal recovery

Abstract

The invention belongs to the technical field of heavy oil thermal recovery, and discloses a multi-energy complementary energy supply system and method.The system comprises a photo-thermal steam production subsystem, a photovoltaic energy storage power generation subsystem, a combined heat and power generation subsystem and a control subsystem, and the control subsystem is used for controlling the load of the photo-thermal steam production subsystem according to the predicted load of the photo-thermal steam production subsystem; the load of the photovoltaic energy storage power generation subsystem and the load of the combined heat and power generation subsystem control coupling operation of the photo-thermal steam generation subsystem, the photovoltaic energy storage power generation subsystem and the combined heat and power generation subsystem. According to the system, the photo-thermal steam generation subsystem with the highest efficiency is firstly used as a main energy source for clean replacement and can provide steam for heavy oil thermal recovery, then the combined heat and power generation subsystem is used as a basic load, continuity of energy supply for an oil field can be achieved, and finally the photovoltaic energy storage power generation subsystem is used for supplementing and peak regulation. And the stability of energy supply is realized through the control subsystem.

Description

Technical Field

[0001] This invention belongs to the field of heavy oil thermal recovery technology, and specifically relates to a multi-energy complementary power supply system and method for heavy oil thermal recovery. Background Technology

[0002] Heavy oil, due to its high viscosity, cannot be directly extracted from oil wells using mechanical extraction methods. It requires the injection of high-temperature, high-pressure steam into the formation to raise the oil's temperature and reduce its viscosity. The heavy oil is then mixed with steam condensate to form a more fluid oil-water mixture, which is then extracted from the well using mechanical means. This process consumes a large amount of steam and heat; for example, in one oilfield, approximately 77.5% of its annual energy consumption is used for the heavy oil steam injection system.

[0003] Currently, steam from heavy oil thermal recovery is primarily produced using gas-fired boilers. Very few oilfields have implemented clean alternatives using new energy systems such as solar thermal and photovoltaic. This process not only consumes a large amount of natural gas but also emits a significant amount of carbon dioxide, resulting in high steam production costs.

[0004] To address this issue, existing heavy oil thermal recovery technologies include the following:

[0005] Using a solar steam production system for heavy oil thermal recovery, this technology employs a linear focusing trough-type solar thermal mirror field, which has a low focusing ratio. As a result, the temperature, pressure, and superheat of the generated steam are relatively low, leading to low efficiency in steam injection for heavy oil thermal recovery.

[0006] To achieve continuous 24-hour steam supply to the oilfield using a parabolic trough solar thermal system with energy storage, the required energy storage capacity is very large, resulting in high steam costs and poor economic efficiency and feasibility.

[0007] The design incorporates a large-scale complementary and synergistic steam injection system integrating wind, solar, and energy storage. This system utilizes battery energy storage to store surplus electricity generated during peak solar and wind power periods, which is then heated by an electrode boiler to produce steam. However, due to the instability of solar and wind power generation, a large-scale energy storage system is required to ensure the stability of the heavy oil steam injection flow rate, significantly reducing the economic efficiency of the steam injection system. Furthermore, the electrode boiler struggles to produce superheated steam with high superheat, resulting in low thermal recovery efficiency for heavy oil.

[0008] In summary, existing heavy oil thermal recovery systems suffer from problems such as high cost and low efficiency. Summary of the Invention

[0009] To address the above problems, this invention provides a multi-energy complementary power supply system and method for heavy oil thermal recovery, employing the following technical solution:

[0010] A multi-energy complementary power supply system for heavy oil thermal recovery includes:

[0011] The solar thermal steam generation subsystem is used to absorb solar heat to heat water, generate superheated steam, and then transport the superheated steam to the external steam supply network.

[0012] Photovoltaic energy storage power generation systems are used to convert solar radiation into electrical energy and store or output the electrical energy to an external power grid;

[0013] The combined heat and power (CHP) subsystem is used to convert the energy generated by burning natural gas and air into electrical energy and superheated steam, and output the electrical energy to the external power grid and transport the superheated steam to the external steam supply network.

[0014] The control subsystem is used to predict the load of the solar thermal steam generation subsystem based on latitude and longitude data, meteorological data, sky cloud data, and efficiency parameters of the solar thermal steam generation subsystem, and to calculate the load of the photovoltaic energy storage power generation subsystem and the load of the combined heat and power subsystem.

[0015] Based on the predicted loads of the solar thermal steam generation subsystem, the photovoltaic energy storage power generation system, and the cogeneration subsystem, the coupled operation of the solar thermal steam generation subsystem, the photovoltaic energy storage power generation system, and the cogeneration subsystem is controlled.

[0016] Furthermore, the solar thermal steam production subsystem includes a feedwater pump, a heat absorption tower, a heliostat field, and a water-based heat absorber;

[0017] The water-based heat absorber is installed on the heat absorption tower. The inlet of the feed water pump is connected to the outlet of the deaerator, and the outlet of the feed water pump is connected to the inlet of the water-based heat absorber. The water-based heat absorber is used to absorb the solar heat focused and projected by the heliostat field, convert water into superheated steam, and transport the superheated steam to the external steam supply network.

[0018] Furthermore, photovoltaic energy storage power generation systems include photovoltaic modules, inverters, and energy storage battery packs;

[0019] The output of the photovoltaic module is connected to the charging interface of the energy storage battery pack and the input of the inverter. The output of the energy storage battery pack is connected to the input of the inverter, and the output of the inverter is connected to the external power supply network.

[0020] Furthermore, the cogeneration subsystem includes a gas turbine, a generator, and a waste heat boiler;

[0021] The gas turbine's power output is connected to the generator's power input. The gas turbine drives the generator to produce electricity. The generator's power output is connected to an external power supply network. The gas turbine's outlet is connected to the waste heat boiler's inlet. The waste heat boiler's inlet is connected to the boiler water pump's outlet. The boiler water pump's inlet is connected to the deaerator's outlet via a feedwater pipe. The waste heat boiler's outlet is connected to an external steam supply network.

[0022] Furthermore, the control subsystem includes a feedforward control system, which comprises a weather station, an all-sky imager, and a server.

[0023] The weather station is used to send the collected meteorological data to the server, the all-sky imager is used to send the collected sky cloud data to the server, and the server is used to predict the load of the solar thermal steam generation subsystem and calculate the load of the photovoltaic energy storage power generation subsystem and the combined heat and power subsystem.

[0024] Furthermore, the control subsystem also includes a distributed control system;

[0025] The distributed control system is used to control the amount of water entering the tower-type solar thermal steam production subsystem according to the predicted load of the solar thermal steam production subsystem, so as to generate superheated steam that enters the external steam supply network.

[0026] Based on the demand of the external steam supply network, the load of the cogeneration subsystem is calculated and controlled, and the superheated steam generated by the cogeneration subsystem enters the external steam supply network.

[0027] Based on the load of the cogeneration subsystem, calculate the power generation of the cogeneration subsystem, and coupled calculate the power generation and storage capacity of the photovoltaic energy storage power generation system. Based on the calculation results, control the cogeneration subsystem and / or photovoltaic energy storage power generation system to transmit electrical energy to the external power grid.

[0028] Furthermore, a first valve is installed at the outlet of the water pump and the inlet of the water-working heat absorber.

[0029] Furthermore, a third valve is installed between the inlet of the waste heat boiler and the outlet of the boiler water pump.

[0030] This invention also provides a multi-energy complementary power supply method for heavy oil thermal recovery, comprising the following steps:

[0031] Based on latitude and longitude data, meteorological data, cloud cover data, and efficiency parameters of the solar thermal steam generation subsystem, the load of the solar thermal steam generation subsystem is predicted, and the load of the photovoltaic energy storage power generation subsystem and the load of the combined heat and power subsystem are calculated.

[0032] Based on the predicted loads of the solar thermal steam generation subsystem, the photovoltaic energy storage power generation system, and the cogeneration subsystem, the coupled operation of the solar thermal steam generation subsystem, the photovoltaic energy storage power generation system, and the cogeneration subsystem is controlled.

[0033] Furthermore, meteorological data includes solar position data, atmospheric transmittance, temperature, and wind speed; efficiency parameters of the solar thermal steam generation subsystem include heliostat field efficiency parameters and water-based receiver efficiency parameters; sky cloud data includes cloud information and cloud cover coefficient; and loads include steam load and electrical load.

[0034] Furthermore, based on latitude and longitude data, meteorological data, cloud cover data, and efficiency parameters of the solar thermal steam generation subsystem, the load of the solar thermal steam generation subsystem is predicted, and the loads of the photovoltaic energy storage power generation system and the combined heat and power (CHP) subsystem are calculated, including the following steps:

[0035] When there is sunlight, the feedforward control system predicts the intensity of direct solar radiation at all times of the day based on latitude and longitude data and solar position data.

[0036] Predict the power of the water-based receiver and the steam load in clear skies based on data of direct solar radiation intensity, atmospheric transmittance, wind speed, temperature, efficiency parameters of heliostat field, and efficiency parameters of the water-based receiver.

[0037] Analyze the cloud conditions in the sky, obtain cloud information, and predict the cloud cover coefficient for a certain period of time in the future based on the cloud information and wind speed;

[0038] Based on the power of the clear-sky water-based heat receiver, the clear-sky steam load, and the cloud cover coefficient, the load of the solar thermal steam generation subsystem is predicted for a certain period of time in the future, and the loads of the photovoltaic energy storage power generation system and the combined heat and power subsystem are calculated.

[0039] Furthermore, based on the predicted loads of the solar thermal steam generation subsystem, the photovoltaic energy storage power generation system, and the cogeneration subsystem, the coupled operation of the solar thermal steam generation subsystem, the photovoltaic energy storage power generation system, and the cogeneration subsystem is controlled, including the following steps:

[0040] Based on the predicted load of the solar thermal steam production subsystem, a set amount of water is controlled to enter the tower-type solar thermal steam production subsystem to generate superheated steam which enters the external steam supply network.

[0041] Based on the demand of the external steam supply network, the load of the cogeneration subsystem is calculated and controlled, and the superheated steam generated by the cogeneration subsystem enters the external steam supply network.

[0042] Based on the load of the cogeneration subsystem, calculate the power generation of the cogeneration subsystem, and coupled calculate the power generation and storage capacity of the photovoltaic energy storage power generation system. Based on the calculation results, control the cogeneration subsystem and / or photovoltaic energy storage power generation system to transmit electrical energy to the external power grid.

[0043] The beneficial effects of this invention are:

[0044] 1. This invention first utilizes the most efficient solar thermal steam generation subsystem as the main clean alternative energy source, which can efficiently provide steam for heavy oil thermal recovery. Then, the cogeneration subsystem is used as the base load to ensure the continuity of energy supply to the oil field. Finally, the photovoltaic energy storage power generation system is used for supplementation and peak shaving. The stability of energy supply is achieved through the control subsystem.

[0045] 2. This invention can achieve as much clean energy substitution as possible while ensuring a stable and continuous energy supply, thereby reducing energy consumption and carbon emissions.

[0046] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 A schematic diagram of a multi-energy complementary power supply system for heavy oil thermal recovery according to an embodiment of the present invention is shown.

[0049] Figure 2 A schematic diagram of the structure of a control subsystem according to an embodiment of the present invention is shown;

[0050] Figure 3 A schematic flowchart illustrating the calculation of the load of each subsystem by the feedforward control system according to an embodiment of the present invention is shown.

[0051] In the diagram: 1. Water treatment unit; 2. Deaerator; 3. Feed pump; 4. Heat absorption tower; 5. Heliostat field; 6. Water-based heat absorber; 7. First valve; 8. First steam pipe; 9. Second valve; 10. Photovoltaic module; 11. Inverter; 12. Energy storage battery pack; 13. Gas turbine; 14. Generator; 15. Waste heat boiler; 16. Boiler water pump; 17. Third valve; 18. Second steam pipe; 19. Fourth valve; 20. Weather station; 21. All-sky imager; 22. Server; 23. Distributed control system. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," "longitudinal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings.

[0054] This invention provides a multi-energy complementary power supply system and method for heavy oil thermal recovery. First, it utilizes a highly efficient tower-type solar thermal steam generation system as the primary clean energy source, efficiently providing steam for heavy oil thermal recovery. Then, a combined heat and power system (CHP) consisting of a gas turbine and a waste heat boiler serves as the base load, ensuring continuous power supply to the oilfield. Finally, photovoltaic energy storage is used for supplementation and peak shaving. The stability of the power supply is achieved through a steam supply control subsystem. This invention enables maximum clean energy substitution while ensuring a stable and continuous power supply, reducing energy consumption and carbon emissions.

[0055] A multi-energy complementary power supply system for heavy oil thermal recovery includes a solar thermal steam generation subsystem, a photovoltaic energy storage and power generation subsystem, a combined heat and power (CHP) subsystem, and a control subsystem. The four parts work together to provide thermal recovery steam and electricity to the heavy oil well area.

[0056] Among them, the solar thermal steam generation subsystem is used to absorb solar heat to heat water, generate high-temperature and high-pressure superheated steam, and transport the superheated steam to the external steam supply network.

[0057] Photovoltaic energy storage power generation systems are used to convert solar radiation into electrical energy and store or output the electrical energy to external power grids.

[0058] The combined heat and power (CHP) subsystem is used to convert the energy generated by burning natural gas and air into electricity and superheated steam, and output the electricity to the external power grid and transport the superheated steam to the external steam supply network.

[0059] The control subsystem is used to predict the load of the solar thermal steam generation subsystem and calculate the load of the photovoltaic energy storage power generation subsystem and the combined heat and power subsystem based on latitude and longitude data, meteorological data, sky cloud data and efficiency parameters of the solar thermal steam generation subsystem.

[0060] The control subsystem is also used to control the coupled operation of the solar thermal steam generation subsystem, the photovoltaic energy storage power generation subsystem, and the cogeneration subsystem based on the predicted load of the solar thermal steam generation subsystem, the photovoltaic energy storage power generation subsystem, and the cogeneration subsystem, so as to stably and continuously output superheated steam and electricity to the well area.

[0061] like Figure 1 As shown, for example, the solar thermal steam generation subsystem includes a feedwater pump 3, a heat absorption tower 4, a heliostat field 5, and a water-based heat absorber 6, which is mounted on the heat absorption tower 4.

[0062] Oilfield produced water is transported to water treatment unit 1 for purification and then to deaerator 2. Deaerator 2 deoxygenates the purified water. The inlet of feedwater pump 3 is connected to the outlet of deaerator 2 through feedwater pipeline, and the outlet of feedwater pump 3 is connected to the inlet of water-working heat absorber 6. For example, a first valve 7 is provided at the outlet of feedwater pump 3 and the inlet of water-working heat absorber 6.

[0063] The water-based heat absorber 6 is used to absorb the solar heat focused and projected by the heliostat field 5, converting water into high-temperature, high-pressure superheated steam, and then transporting the superheated steam to the external steam supply network through the first steam pipe 8. For example, a second valve 9 is installed on the first steam pipe 8.

[0064] like Figure 1 As shown, for example, a photovoltaic energy storage power generation system includes a photovoltaic module 10, an inverter 11, and an energy storage battery pack 12. The output terminal of the photovoltaic module 10 is connected to the charging interface of the energy storage battery pack 12 and the input terminal of the inverter 11. The output terminal of the energy storage battery pack 12 is connected to the input terminal of the inverter 11. The output terminal of the inverter 11 is connected to an external power supply network.

[0065] The photovoltaic module 10 is used to convert the received solar radiation into electrical energy, and transmit part of the electrical energy to the inverter 11 and part to the energy storage battery pack 12 for storage. When power generation is needed, the inverter 11 transmits the electrical energy to the external power grid through the cable.

[0066] like Figure 1As shown, for example, the cogeneration subsystem includes a gas turbine 13, a generator 14, and a waste heat boiler 15. The power output end of the gas turbine 13 is connected to the power input end of the generator 14. The gas turbine 13 is used to drive the generator 14 to generate electrical energy. The power output end of the generator 14 is connected to an external power supply network through a power cable. The electrical energy is output to the external power supply network through the power cable. The gas outlet of the gas turbine 13 is connected to the gas inlet of the waste heat boiler 15. The water inlet of the waste heat boiler 15 is connected to the water outlet of the boiler water pump 16. For example, a third valve 17 is provided between the water inlet of the waste heat boiler 15 and the water outlet of the boiler water pump 16.

[0067] The inlet of the boiler water pump 16 is connected to the outlet of the deaerator 2 through the water supply pipe, and the outlet of the waste heat boiler 15 is connected to the external steam supply network through the second steam pipe 18. The low-temperature tail gas of the waste heat boiler 15 is discharged into the air. For example, a fourth valve 19 is installed on the second steam pipe 18.

[0068] Natural gas and air enter the gas turbine 13 and mix and burn, forming a high-temperature, high-pressure airflow. This airflow drives the blades to rotate and generate electricity, which is then transmitted to the external power grid via cables. After the high-temperature, high-pressure airflow performs work, its temperature and pressure decrease, forming high-temperature exhaust gas (approximately 600°C), which enters the waste heat boiler 15. Purified and deoxygenated feedwater is pumped to the waste heat boiler 15 via the boiler water pump 16, where it exchanges heat with the high-temperature exhaust gas to generate highly superheated steam, which is then connected to the external steam supply network via steam pipelines.

[0069] like Figure 2 As shown, for example, the control subsystem includes a feedforward control system and a distributed control system (DCS). The feedforward control system is used to predict the load of the solar thermal steam generation subsystem based on latitude and longitude data, meteorological data, sky cloud data and efficiency parameters of the solar thermal steam generation subsystem. The feedforward control system is also used to calculate the load of the photovoltaic energy storage power generation subsystem and the load of the combined heat and power subsystem. The load includes steam load and power load.

[0070] The meteorological data includes solar position data, atmospheric transmittance, temperature and wind speed; the efficiency parameters of the solar thermal steam generation subsystem include the efficiency parameters of the heliostat field 5 and the efficiency parameters of the water-based heat receiver 6; and the cloud data includes cloud information and cloud cover coefficient.

[0071] The distributed control system 23 is used to control the amount of water entering the tower-type solar thermal steam production subsystem according to the predicted load of the solar thermal steam production subsystem, so as to generate superheated steam that enters the external steam supply network.

[0072] The distributed control system 23 is also used to calculate and control the load of the cogeneration subsystem according to the demand of the external steam supply network. The superheated steam generated by the cogeneration subsystem enters the external steam supply network, which provides stable and continuous steam to the well area.

[0073] The distributed control system 23 is also used to calculate the power generation of the cogeneration subsystem based on the load of the cogeneration subsystem, and to couple the calculation of the power generation and storage capacity of the photovoltaic energy storage power generation system. Based on the calculation results, it controls the cogeneration subsystem and / or the photovoltaic energy storage power generation system to transmit power to the external power network, so as to provide stable and continuous power to the well area.

[0074] The distributed control system 23 is also used to control the solar thermal steam generation subsystem and the photovoltaic energy storage and power generation subsystem to stop operating when there is no sunlight at night or on cloudy days, while the cogeneration subsystem operates at full load to provide stable and continuous steam and electricity to the well area.

[0075] like Figure 2 As shown, for example, the feedforward control system includes a weather station 20, an all-sky imager 21, and a server 22. The weather station 20 is used to send the collected meteorological data to the server 22, the all-sky imager 21 is used to send the collected sky cloud data to the server 22, and the server 22 is used to predict the load of the solar thermal steam generation subsystem and calculate the load of the photovoltaic energy storage power generation subsystem and the load of the combined heat and power subsystem.

[0076] Based on the above-mentioned multi-energy complementary power supply system for heavy oil thermal recovery, the present invention also provides a multi-energy complementary power supply method for heavy oil thermal recovery, comprising the following steps:

[0077] S1. The feedforward control system predicts the load of the solar thermal steam generation subsystem based on latitude and longitude data, meteorological data, cloud cover data, and efficiency parameters of the solar thermal steam generation subsystem, and calculates the load of the photovoltaic energy storage power generation subsystem and the combined heat and power subsystem, such as... Figure 3 As shown, the details are as follows:

[0078] S11. When there is sunlight, the feedforward control system predicts the direct solar radiation intensity (DNI) at all times of the day based on latitude and longitude data and solar position data.

[0079] S12, the feedforward control system predicts the power of the clear-sky water-working medium receiver 6 and the clear-sky steam load based on the direct solar radiation intensity data, atmospheric transmittance, wind speed, temperature, efficiency parameters of the heliostat field 5 and the efficiency parameters of the water-working medium receiver 6.

[0080] S13, the all-sky imager 21 of the feedforward control system analyzes the sky cloud conditions, obtains cloud information, and predicts and calculates the cloud cover coefficient for a certain period of time (10-30 minutes) based on the cloud information and wind speed.

[0081] S14. The feedforward control system predicts the load of the solar thermal steam generation subsystem for a certain period of time (10-30 minutes) based on the power of the clear-sky water-based heat receiver 6, the clear-sky steam load, and the cloud cover coefficient, and calculates the load of the photovoltaic energy storage power generation subsystem and the combined heat and power subsystem.

[0082] S2, Distributed Control System 23 controls the coupled operation of the solar thermal steam generation subsystem, the photovoltaic energy storage power generation subsystem, and the cogeneration subsystem based on the predicted load of the solar thermal steam generation subsystem, the photovoltaic energy storage power generation subsystem, and the cogeneration subsystem, so as to stably and continuously output superheated steam and electricity to the well area.

[0083] S21. Based on the predicted load of the solar thermal steam production subsystem, control the set amount of water to enter the tower-type solar thermal steam production subsystem to generate superheated steam that enters the external steam supply network.

[0084] S22. Calculate and control the load of the cogeneration subsystem according to the demand of the external steam supply network. The superheated steam generated by the cogeneration subsystem enters the external steam supply network, which provides stable and continuous steam to the well area.

[0085] S23. Based on the load of the cogeneration subsystem, calculate the power generation of the cogeneration subsystem, and coupled the calculation of the power generation and storage capacity of the photovoltaic energy storage power generation system. Based on the calculation results, control the cogeneration subsystem and / or the photovoltaic energy storage power generation system to transmit power to the external power network, thereby providing stable and continuous power to the well area.

[0086] S24. When there is no sunlight at night or on cloudy days, control the solar thermal steam generation subsystem and the photovoltaic energy storage power generation subsystem to stop operating, and the combined heat and power subsystem to operate at full load to provide stable and continuous steam and electricity to the well area.

[0087] For example, the solar thermal steam production subsystem selects a 100t / h capacity concentrating solar thermal system, the photovoltaic energy storage and power generation system selects a 100MWe capacity photovoltaic module 10 and a 50MWh capacity energy storage battery pack 12, the cogeneration subsystem selects a 6FA gas turbine 13 and a waste heat boiler 15 (150t / h steam production capacity, 75MWe power generation capacity), and the control subsystem includes a 150t / h capacity steam injection network system that can adjust the load of each system.

[0088] Taking a typical day's meteorological data from an oilfield as an example, at 9:00 AM sunrise, the solar thermal steam generation subsystem and the photovoltaic energy storage power generation system start up with the sunrise. By noon, the load of the solar thermal steam generation subsystem increases from 0 t / h to 100 t / h. While ensuring a total steam volume of 150 t / h in the steam injection network, the load of the waste heat boiler 15 is adjusted from 150 t / h to 50 t / h. At the same time, the power generation of the photovoltaic module 10 increases from 0 MWe to a full-capacity 100 MWe. The output power and stored power of the photovoltaic energy storage power generation system are adjusted in real time according to the power generation of the gas turbine 13, controlling the stability of the external power generation of the solar-thermal-electric integrated energy system. The excess power can be transmitted externally.

[0089] From noon to sunset, the load of the solar thermal steam production subsystem is reduced from 100 t / h to 0 t / h. While ensuring a total steam volume of 150 t / h in the steam injection network, the load of waste heat boiler 15 is increased from 50 t / h to 150 t / h. Simultaneously, the power generation of photovoltaic module 10 is reduced from 100 MWe to 0 MWe. The photovoltaic energy storage power generation system is adjusted in real-time based on the power generation of gas turbine 13 to control the stability of external power generation from the solar-thermal-electric integrated energy system. Any insufficient power can be purchased from the grid. At night, when there is no sunlight, gas turbine 13 and waste heat boiler 15 operate at full load, providing steam and electricity to the well area.

[0090] This invention first utilizes the most efficient solar thermal steam generation subsystem as the primary clean energy source, enabling efficient steam supply for heavy oil thermal recovery. Then, a combined heat and power (CHP) subsystem consisting of gas turbine 13 and waste heat boiler 15 serves as the base load, ensuring continuous energy supply to the oilfield. Finally, a photovoltaic energy storage and power generation system is used for supplementation and peak shaving, and a control subsystem ensures stable energy supply. This invention achieves maximum clean energy substitution while ensuring stable and continuous energy supply, reducing energy consumption and carbon emissions.

[0091] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-energy complementary power supply system for heavy oil thermal recovery, characterized in that, include: The solar thermal steam generation subsystem is used to absorb solar heat to heat water, generate superheated steam, and then transport the superheated steam to the external steam supply network. Photovoltaic energy storage power generation systems are used to convert solar radiation into electrical energy and store or output the electrical energy to an external power grid; The combined heat and power (CHP) subsystem is used to convert the energy generated by burning natural gas and air into electrical energy and superheated steam, and output the electrical energy to the external power grid and transport the superheated steam to the external steam supply network. The control subsystem is used to predict the load of the solar thermal steam generation subsystem based on latitude and longitude data, meteorological data, sky cloud data, and efficiency parameters of the solar thermal steam generation subsystem, and to calculate the load of the photovoltaic energy storage power generation subsystem and the load of the combined heat and power subsystem. Based on the predicted loads of the solar thermal steam generation subsystem, the photovoltaic energy storage power generation system, and the cogeneration subsystem, the coupled operation of the solar thermal steam generation subsystem, the photovoltaic energy storage power generation system, and the cogeneration subsystem is controlled.

2. The multi-energy complementary power supply system for heavy oil thermal recovery according to claim 1, characterized in that, The solar thermal steam production subsystem includes a feedwater pump, a heat absorption tower, a heliostat field, and a water-based heat absorber; The water-based heat absorber is installed on the heat absorption tower. The inlet of the feed water pump is connected to the outlet of the deaerator, and the outlet of the feed water pump is connected to the inlet of the water-based heat absorber. The water-based heat absorber is used to absorb the solar heat focused and projected by the heliostat field, convert water into superheated steam, and transport the superheated steam to the external steam supply network.

3. The multi-energy complementary power supply system for heavy oil thermal recovery according to claim 1, characterized in that, Photovoltaic energy storage power generation systems include photovoltaic modules, inverters, and energy storage battery packs; The output of the photovoltaic module is connected to the charging interface of the energy storage battery pack and the input of the inverter. The output of the energy storage battery pack is connected to the input of the inverter, and the output of the inverter is connected to the external power supply network.

4. The multi-energy complementary power supply system for heavy oil thermal recovery according to claim 1, characterized in that, The cogeneration subsystem includes a gas turbine, a generator, and a waste heat boiler; The gas turbine's power output is connected to the generator's power input. The gas turbine drives the generator to produce electricity. The generator's power output is connected to an external power supply network. The gas turbine's outlet is connected to the waste heat boiler's inlet. The waste heat boiler's inlet is connected to the boiler water pump's outlet. The boiler water pump's inlet is connected to the deaerator's outlet via a feedwater pipe. The waste heat boiler's outlet is connected to an external steam supply network.

5. The multi-energy complementary power supply system for heavy oil thermal recovery according to any one of claims 1-4, characterized in that, The control subsystem includes a feedforward control system, which comprises a weather station, an all-sky imager, and a server. The weather station is used to send the collected meteorological data to the server, the all-sky imager is used to send the collected sky cloud data to the server, and the server is used to predict the load of the solar thermal steam generation subsystem and calculate the load of the photovoltaic energy storage power generation subsystem and the combined heat and power subsystem.

6. The multi-energy complementary power supply system for heavy oil thermal recovery according to claim 5, characterized in that, The control subsystem also includes a distributed control system; The distributed control system is used to control the amount of water entering the tower-type solar thermal steam production subsystem according to the predicted load of the solar thermal steam production subsystem, so as to generate superheated steam that enters the external steam supply network. Based on the demand of the external steam supply network, the load of the cogeneration subsystem is calculated and controlled, and the superheated steam generated by the cogeneration subsystem enters the external steam supply network. Based on the load of the cogeneration subsystem, calculate the power generation of the cogeneration subsystem, and coupled calculate the power generation and storage capacity of the photovoltaic energy storage power generation system. Based on the calculation results, control the cogeneration subsystem and / or photovoltaic energy storage power generation system to transmit electrical energy to the external power grid.

7. The multi-energy complementary power supply system for heavy oil thermal recovery according to claim 2, characterized in that, The outlet of the water pump and the inlet of the water-working heat absorber are equipped with a first valve.

8. The multi-energy complementary power supply system for heavy oil thermal recovery according to claim 4, characterized in that, A third valve is installed between the inlet of the waste heat boiler and the outlet of the boiler water pump.

9. A multi-energy complementary power supply method for heavy oil thermal recovery, characterized in that, Includes the following steps: Based on latitude and longitude data, meteorological data, cloud cover data, and efficiency parameters of the solar thermal steam generation subsystem, the load of the solar thermal steam generation subsystem is predicted, and the load of the photovoltaic energy storage power generation subsystem and the load of the combined heat and power subsystem are calculated. Based on the predicted loads of the solar thermal steam generation subsystem, the photovoltaic energy storage power generation system, and the cogeneration subsystem, the coupled operation of the solar thermal steam generation subsystem, the photovoltaic energy storage power generation system, and the cogeneration subsystem is controlled.

10. The multi-energy complementary power supply method for heavy oil thermal recovery according to claim 9, characterized in that, Meteorological data includes solar position data, atmospheric transmittance, temperature, and wind speed; efficiency parameters of the solar thermal steam generation subsystem include heliostat efficiency parameters and water-based receiver efficiency parameters; cloud data includes cloud information and cloud cover coefficient; and loads include steam load and power load.

11. The multi-energy complementary power supply method for heavy oil thermal recovery according to claim 10, characterized in that, Based on latitude and longitude data, meteorological data, cloud cover data, and efficiency parameters of the solar thermal steam generation subsystem, the load of the solar thermal steam generation subsystem is predicted, and the loads of the photovoltaic energy storage power generation subsystem and the combined heat and power subsystem are calculated, including the following steps: When there is sunlight, the feedforward control system predicts the intensity of direct solar radiation at all times of the day based on latitude and longitude data and solar position data. Predict the power of the water-based receiver and the steam load in clear skies based on data of direct solar radiation intensity, atmospheric transmittance, wind speed, temperature, efficiency parameters of heliostat field, and efficiency parameters of the water-based receiver. Analyze the cloud conditions in the sky, obtain cloud information, and predict the cloud cover coefficient for a certain period of time in the future based on the cloud information and wind speed; Based on the power of the clear-sky water-based heat receiver, the clear-sky steam load, and the cloud cover coefficient, the load of the solar thermal steam generation subsystem is predicted for a certain period of time in the future, and the loads of the photovoltaic energy storage power generation system and the combined heat and power subsystem are calculated.

12. The multi-energy complementary power supply method for heavy oil thermal recovery according to claim 10 or 11, characterized in that, Based on the predicted loads of the solar thermal steam generation subsystem, the photovoltaic energy storage power generation system, and the cogeneration subsystem, the coupled operation of these three subsystems is controlled, including the following steps: Based on the predicted load of the solar thermal steam production subsystem, a set amount of water is controlled to enter the tower-type solar thermal steam production subsystem to generate superheated steam which enters the external steam supply network. Based on the demand of the external steam supply network, the load of the cogeneration subsystem is calculated and controlled, and the superheated steam generated by the cogeneration subsystem enters the external steam supply network. Based on the load of the cogeneration subsystem, calculate the power generation of the cogeneration subsystem, and coupled calculate the power generation and storage capacity of the photovoltaic energy storage power generation system. Based on the calculation results, control the cogeneration subsystem and / or photovoltaic energy storage power generation system to transmit electrical energy to the external power grid.

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