A wind-solar-storage complementary and collaborative steam production and auxiliary thickened oil thermal recovery system

Abstract

The present application relates to a kind of wind-light-storage complementary cooperation's steam production and auxiliary thick oil thermal recovery system.A kind of wind-light-storage complementary cooperation's steam production and auxiliary thick oil thermal recovery system includes solar energy heat collection subsystem, wind power subsystem, steam production subsystem, operation control subsystem, the scheme makes full use of solar energy and wind energy such renewable resources for thick oil thermal recovery provides steam, replaces the direct fuel fossil fuel mode in traditional steam production, reduces the pollution to environment, will significantly promote the development and utilization of renewable energy, by comprehensive utilization solar energy and wind energy complementary characteristics, effectively reduce the volatility of single energy system, improve the stability of steam production.According to the different characteristics of radiant heat energy and wind power, different complementary utilization is realized, and the grade of energy is matched and comprehensively utilized, the utilization efficiency of renewable energy is significantly improved, and the development cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to high-temperature water vapor process, in particular to a wind-solar-storage complementary collaborative steam production and auxiliary heavy oil thermal recovery system. BACKGROUND

[0002] Heavy oil is a kind of petroleum resources, according to the global published oil and gas resources statistics, heavy oil reserves account for 70% of the global oil reserves, but the physical properties of heavy oil are very special, mainly showing very viscous, poor flowability, heavy oil due to its high viscosity, poor flowability, generally cannot flow under the condition of oil layer, it is difficult to develop by conventional recovery method, thermal recovery is the most important method for heavy oil thermal recovery at present, which refers to the use of heat engineering theory and method for oil recovery, which is to reduce the viscosity of underground crude oil, dissolve and dissolve the blockage of oil layer, improve the seepage characteristics of the formation, so as to improve the seepage capacity of crude oil in the formation to improve the production, recovery and exploitation benefit, which is a kind of oil recovery technology developed for heavy crude oil and high condensate oil, according to the different ways of heating oil reservoir, the commonly used thermal recovery methods can be divided into steam stimulation, steam flooding, hot water flooding, fire flooding, electromagnetic heating, thermal chemical method and so on, among which steam stimulation and steam flooding are the most widely used methods with the largest oil production, at present, more than 80% of the thermal recovery production in the world is obtained by steam injection recovery method. The general method of on-site preparation of thermal recovery steam is to use crude oil or natural gas as the fuel of thermal recovery steam generator, send it into the thermal recovery steam generator for combustion to prepare thermal recovery steam, and then inject the thermal recovery steam into the heavy oil reservoir to heat and reduce the viscosity for heavy oil recovery, among which steam stimulation and steam flooding are the most widely used.

[0003] However, conventional steam injection heavy oil thermal recovery needs to consume a large amount of water vapor, and the general oil-steam ratio is between 0.15-0.25, and steam production needs to consume a large amount of fossil fuel. Reducing this part of fuel consumption will help improve the recovery rate and reduce environmental pollution. From the geographical environmental distribution, 76% of the recoverable oil resources in China are distributed in plains, shallow seas, gobi and deserts, which are distributed in remote areas. Such areas often have sufficient wind energy, solar energy and other renewable resources.

[0004] Solar energy and wind energy are widely used renewable resources in terms of reserves, which can be taken without exhaustion, and from the regional distribution, wind energy and solar energy can be taken locally without transportation, while the transportation of mineral resources such as coal and oil puts pressure on transportation. Even for electricity, there are still great limitations in remote areas such as gobi and desert. In addition, wind energy and solar energy will not pollute the environment and will not destroy the ecology in the process of utilization.

[0005] Although the above-mentioned advantages exist between solar energy and wind energy, there are also some disadvantages. First, the energy density is low, which cannot be directly applied to the actual production process. Second, the energy stability is poor. Whether it is wind energy or solar energy, it changes with the weather and climate. The instability of energy brings difficulties to the use of the two kinds of energy. In order to provide continuous and stable energy conversion output, whether it is a solar energy collection system or a wind power generation system, an energy storage device needs to be used to adjust the energy supply and demand balance during system operation. However, wind and light resources have good complementarity in time. From the day and night changes, the solar energy resource is sufficient during the day, while the wind energy is more sufficient at night. From the long-term seasonal changes, the solar energy resource is more abundant in spring and summer, while the wind energy resource is more abundant in autumn and winter.

[0006] Therefore, by combining wind energy and solar energy to provide clean renewable energy for the heavy oil thermal recovery process, not only can the problem of high energy consumption and serious environmental pollution in the heavy oil thermal recovery process be solved, but also the complementary characteristics of solar energy and wind energy in time can be fully utilized to improve the stability of energy supply in the heavy oil thermal recovery process. SUMMARY

[0007] The purpose of the present application is to provide a wind-light-storage complementary and collaborative steam production and auxiliary heavy oil thermal recovery system, which produces steam required in the heavy oil thermal recovery process by using solar energy and wind energy, reduces the instability of wind energy and solar energy with time by complementing wind energy and solar energy, and realizes continuous steam production by using heat storage and external power grid to supplement power, promotes the development and utilization of new energy in the field of heavy oil thermal recovery, and reduces direct fuel combustion and environmental pollution in the steam production process.

[0008] Technical scheme: A wind-light-storage complementary and collaborative steam production and auxiliary heavy oil thermal recovery system, comprising a solar energy collection subsystem, a wind power generation subsystem, a steam production subsystem, and a running control subsystem. The solar energy collection subsystem collects solar radiation energy to provide clean heat energy for steam production. The wind power generation subsystem efficiently converts wind power energy into electric energy, adjusts the electric power parameters, and provides electric energy for the system. The steam production subsystem follows the principle of energy grade matching to comprehensively utilize heat energy and electric energy to produce steam that meets the needs of heavy oil thermal recovery. The running control subsystem adjusts the running state of each device in real time, dynamically optimizes the heat energy and electric energy supply ratio in the steam production process, and ensures that the system energy is stably supplied and matched with the energy consumption of steam production.

[0009] Solar energy collection subsystem: composed of a solar energy collection mirror field (a trough type solar energy collector), a high-temperature heat storage tank, a low-temperature heat storage tank, a first working medium circulating pump, a second working medium circulating pump and a circulating loop, the high-temperature heat storage tank and the low-temperature heat storage tank are combined into a heat storage device, the solar energy collection subsystem uses the trough type collector to collect dispersed solar energy into high-energy flow density heat energy and transfer it to the heat-conducting working medium, and the heat-absorbed working medium provides heat energy to the steam production subsystem or enters the high-temperature heat storage tank and the low-temperature heat storage tank for storage under the driving of the circulating pump.

[0010] The solar energy collection mirror field is used to concentrate low-energy-density solar energy into high-energy-flow-density radiant energy, and the collection method can be selected from a trough type, a tower type, a dish type and a linear Fresnel type, the receiver receives the concentrated high-energy-flow-density solar radiant energy and converts it into high-temperature heat energy to be transferred to the heat-conducting working medium or water vapor, the receiver can be selected as a vacuum heat collection pipe and a cavity type according to needs, the heat storage device stores the excess energy of the system in the form of heat energy to supplement the system when the energy supply is insufficient, so as to reduce the energy fluctuation of the system, and the storage and release of heat energy are switched by changing the circulating mode of the heat-conducting working medium.

[0011] The wind power generation subsystem is composed of a wind turbine generator set, an electric control device and an external power grid, the electric control device includes a transformer and a power transmission device, the wind turbine generator set obtains environmental wind power and realizes efficient conversion of kinetic energy into electric energy, the generated electric energy is adjusted by the electric control device and provided to the system power consumption device, and the external power grid is powered when the system has excess electric energy, and vice versa, the external power grid is used as a standby energy source of the wind power generation subsystem to ensure the overall electric energy supply of the system.

[0012] The wind turbine generator set includes an impeller, a gear box, a generator and a tower, which is used to obtain environmental wind energy and efficiently convert the wind energy into electric energy, the electric control device includes a transformer, a power generation controller, a heat exchange and power transmission device, which is used to control the voltage, current and phase parameters of the wind power generation process, provide electric energy for the system, and adjust the connection of the external power grid as a standby energy source of the system, and input electric energy from the external power grid when the system has insufficient electric energy, and correspondingly, the excess electric energy is transmitted to the power grid.

[0013] The steam production subsystem is composed of a softened water storage tank, a feed water pump, a first steam generator (a heat exchanger), a second steam generator (a heat exchanger), a first steam generator (an electric heating drive), a second steam generator (an electric heating drive) and control valves (a-f).

[0014] The steam production subsystem is used for storing softened feed water meeting steam production standards, a feed water pump provides required pressure for steam injection, and the pressurized water enters a first steam generator (heat exchanger), a second steam generator (heat exchanger), a first steam generator (electric heating drive), and a second steam generator (electric heating drive) to produce water vapor meeting production requirements in the form of direct heat exchange and electric heating drive; during steam production, the production process can be changed by adjusting the control valve of steam production, so as to realize mutual matching of steam production heat load and system energy supply.

[0015] The operation control subsystem includes a central controller, and is divided into three control modules as follows:

[0016] Control module A: the light collection angle of the heliostat field is adjusted by tracking the sun motion trajectory, and the heat energy storage and release process of the solar heat collection subsystem is adjusted.

[0017] Control module B: the wind power generation subsystem is adjusted, and the electric energy of the wind power generation subsystem is flexibly dispatched according to the steam production electric power requirement of the system.

[0018] Control module C: the heat load and system energy supply matching relationship in the steam production process are cooperatively controlled.

[0019] The central controller adopts an optimization algorithm, and according to the real-time change of wind and light resources, the system power generation and heat collection are predicted, the possible energy supply change is pre-adjusted and optimized, the wind power energy with high energy grade is used for the high-temperature stage of steam production, and the solar thermal energy is used for the heating stage with relatively low temperature, so that the wind power energy and the solar thermal energy are matched with different quality energy required in different stages of steam production, and the energy utilization mode is optimized.

[0020] As a preferred scheme of the wind-light-storage complementary and cooperative steam production and auxiliary thickened oil thermal recovery system in the application, the light collection heliostat field is composed of a plurality of light collection and heat collection units, each unit includes a light collector, a heat collector and a tracking drive device, a linear light collection mode is adopted to realize tracking and collection of solar energy, solar radiation energy is converged to a vacuum heat collection pipe through a trough type heat collection mirror, and then heat energy is transmitted to a steam generator or stored in a high-temperature heat storage tank through a heat conducting medium, so as to realize storage and utilization of heat energy, double-tank heat storage is adopted to realize storage and release of heat energy, the heat storage medium can be molten salt or heat conducting oil, according to the energy scheduling requirement of the system, the heat conducting medium from the low-temperature heat storage tank is transported to the mirror field to absorb solar radiation heat during heat storage, the high-temperature medium after heat absorption is transported to the high-temperature heat storage tank for heat storage, and the medium in the high-temperature heat storage tank flows into a heat exchanger during heat release, so as to realize the medium circulation process of heat storage and heat release.

[0021] As a preferred scheme of the wind-solar-storage complementary and collaborative steam production and auxiliary thickened oil thermal recovery system in the application, the working medium circulation mode comprises the following five modes:

[0022] 1) Steady-state circulation flow: when the solar radiation heat collection amount is equal to the heat load of the first steam generator (heat exchanger) and the second steam generator (heat exchanger), the passages of the control valves a, b and the high-temperature heat storage tank and the low-temperature heat storage tank are closed, the heat-conducting working medium is sequentially passed through each solar heat collecting unit in the trough-type solar heat collecting mirror field under the action of the first working medium circulating pump, absorbs solar radiation energy and transmits heat energy to the first steam generator (heat exchanger) and the second steam generator (heat exchanger) for steam production, and forms a closed circulation.

[0023] 2) Solar energy heat storage flow: when the solar radiation heat collection amount is greater than the heat load demand of the first steam generator (heat exchanger) and the second steam generator (heat exchanger), the control valve b is adjusted, the first working medium circulating pump transports the heat-conducting working medium from the low-temperature heat storage tank and the outlets of the first steam generator (heat exchanger) and the second steam generator (heat exchanger) to the solar heat collecting mirror field to absorb solar radiation heat, then the working medium is divided into two parts through the control valve a, one part passes through the second steam generator (heat exchanger) to meet the heat load demand of steam production, and the other part of the high-temperature working medium is transported to the high-temperature heat storage tank.

[0024] 3) Electric heat storage flow: when the power supply of the wind turbine generator set is rich, the cooling working medium in the low-temperature heat storage tank is heated by the working medium heater and stored in the high-temperature heat storage tank, and the electric heat storage and other heat storage and release processes of the high-temperature heat storage tank do not affect each other and can be performed at the same time.

[0025] 4) Solar storage complementary flow: when the solar radiation heat collection amount is less than the heat exchange demand of the first steam generator (heat exchanger) and the second steam generator (heat exchanger), part of the heat working medium needs to be supplemented from the high-temperature heat storage tank, the first working medium circulating pump, the second working medium circulating pump and the control valve a are jointly adjusted to make the working medium of the solar heat collecting mirror field and the high-temperature heat storage tank flow into the first steam generator (heat exchanger) and the second steam generator (heat exchanger) together, and the working medium after heat exchange is divided into two parts through the control valve b, one part flows into the low-temperature heat storage tank, and the other part enters the trough-type solar heat collecting mirror field for recycling.

[0026] 5) Heat storage independent heating flow: when the solar heat collecting mirror field cannot obtain radiation heat, the heat of the heat exchanger first steam generator (electric heating driven) and the second steam generator (electric heating driven) is entirely supplied by stored heat energy, at this time, the passages of the control valves a, b and the solar heat collecting mirror field are closed, the high-temperature working medium in the high-temperature heat storage tank flows through the second working medium circulating pump, the first steam generator (heat exchanger) and the second steam generator (heat exchanger), and then flows into the low-temperature heat storage tank after cooling.

[0027] As a preferred scheme of the wind-light-storage complementary and collaborative steam production and auxiliary thickened oil thermal recovery system in the application: the wind turbine converts wind into electric energy, the generated electric energy is transmitted to the power consumption equipment through the voltage transmission device, the first steam generator (electric heating driven) and the second steam generator (electric heating driven) driven by the electric energy are used for producing steam, the steam superheater is used for finally adjusting the thermal parameters of the injected steam, when the wind power generation is insufficient to meet the power load demand of the system, the electric energy can be directly input from the external power grid, in the extreme case, the steam production load of the system can be met by the external power grid, when the wind power generation is surplus, the surplus electric power is heated by the working medium heater to heat the low-temperature working medium in the low-temperature heat storage tank and is transmitted to the high-temperature heat storage tank, the electric energy is converted into heat energy for storage, when the heat storage capacity reaches the upper limit, the remaining electric energy is supplied to the power grid after being boosted by the electric control device.

[0028] As a preferred scheme of the wind-light-storage complementary and collaborative steam production and auxiliary thickened oil thermal recovery system in the application: the steam heating process in the steam production subsystem is adjusted by the control module B of the control subsystem, under ideal environmental conditions, the feed water is softened and stored in the softening storage tank, is boosted by the feed water pump after being softened, is superheated by the second steam generator (heat exchanger) and the first steam generator (electric heating driven), according to the energy quality difference between wind energy and light energy, the solar energy and the wind power are used in stages to produce high-temperature water steam meeting the injection and recovery standards, and finally are input into the steam injection well.

[0029] As a preferred scheme of the wind-light-storage complementary and collaborative steam production and auxiliary thickened oil thermal recovery system in the application: in the operation control subsystem,

[0030] The control module A adopts the sun motion trajectory tracking, the sunlight ray sensor collects the solar radiation intensity and the incident angle in real time, outputs the tracking signal after being calculated and processed by the central controller, the tracking driving device adjusts the light collection angle of the mirror field, ensures the optimal heat collection efficiency, at the same time, according to the energy regulation strategy, the first working medium circulating pump and the control valves a and b are adjusted in time, the flow and the circulation mode of the working medium are controlled, so that the heat storage and heat release of the heat storage device are switched, and the specific adjustment mode is as follows:

[0031] The control module B adjusts the operation state of the wind turbine according to the wind direction parameters obtained by the wind sensor, and predicts the wind power generation in advance, and pre-regulates the power supply;

[0032] The control module C optimizes the energy utilization mode in the steam production process according to the energy supply conditions of the solar heat collection subsystem and the wind power generation subsystem, adjusts and controls the valves f, e and the valves c, d and the feed water pump in real time, so as to adjust the consumption ratio of heat energy and electric energy in the steam production, feeds the parameters of the injected steam to the control system for timely adjustment, and transmits the electric energy generated by the wind turbine to the first steam generator (electric heating drive) and the second steam generator (electric heating drive) to be converted into heat energy for steam production. The surplus electric energy is stored as heat energy by the working medium heater, and finally the electric energy exceeding the heat storage limit is boosted and transmitted to the external power grid. When the system power load cannot be met by the wind power generation system, the electric energy is selected from the external power grid to ensure the continuity of steam production.

[0033] As a preferred scheme of the wind-solar-storage complementary and collaborative steam production and auxiliary thickened oil thermal recovery system in the application, the control module B can control the system to adopt the following six types of operation modes:

[0034] ①, independent photothermal mode: the wind power generation of the system is zero, and the heat load of steam production is provided by the first steam generator (heat exchanger) and the second steam generator (heat exchanger). At this time, the control valve f, the control valve d and the passageway of the electrically driven first steam generator (electric heating drive) and the second steam generator (electric heating drive) are closed. The production process of steam is as follows: the softened water tank is pressurized by the feed water pump, then heated by the first steam generator (heat exchanger) and the second steam generator (heat exchanger) to become high-temperature steam, then adjusted by the steam superheater to finally be injected into the well, and the heat conduction working medium flows in three modes: steady-state circulation, solar energy storage and solar heat and storage complementary flow;

[0035] ②, independent electric heating mode: when the solar heat collection and storage of the system is zero, the heat load of steam production is provided by the first steam generator (heat exchanger) and the second steam generator (heat exchanger). At this time, the control valve f, d and the passageway of the first steam generator (heat exchanger) and the second steam generator (heat exchanger) are closed. The production process of steam is as follows: the softened water tank is pressurized by the feed water pump, then heated by the first steam generator (heat exchanger) and the second steam generator (heat exchanger) to become high-temperature steam, then adjusted by the steam superheater to finally be injected into the well, and the heat conduction working medium circulates in the electric energy storage flow or stops circulating when the power supply of the wind turbine is insufficient;

[0036] ③, no energy storage wind and light complementary steam production mode: the wind and light energy supply of the system just meets the steam production heat load demand, the steam production process is: softened water flows through the feed water pump, control valve f, the second steam generator (heat exchanger), and then is divided into two parts by control valve c, one part passes through control valve d and the first steam generator (electric heating driven), and the other part passes through the first steam generator (heat exchanger) for heating, and then is jointly injected into control valve e, and finally is injected into the wellbore, because the heat source temperature generated by the thermoelectric effect is higher than that of the solar heat collection, the electric energy generated by the wind power generation is mainly used for the high-temperature heating section of the first steam generator (electric heating driven) and the steam superheater, and the heat of the heat conducting medium is mostly used for the low-temperature heating section of the steam, so as to improve the heat transfer temperature difference and realize full utilization of heat, at this time the flow mode of the heat conducting medium is steady-state circulating flow;

[0037] ④, light and heat storage wind and light complementary steam production mode: when the wind and light energy supply of the system is greater than the steam production heat load demand, the steam production process is: softened water is pressurized by the working medium pump, and then flows through the control valve f, and according to the principle of preferentially using electric heating, the water is divided into two parts, one part flows into the first steam generator (electric heating driven), and the other part flows into the first steam generator (heat exchanger), and the water vapor at the outlet of the second steam generator (heat exchanger) is divided into two parts by the control valve c, one part is heated by the first steam generator (heat exchanger), and the other part is heated by the steam generator, and the superheated steam is finally combined by the control valve e, and is injected into the well after adjusting the thermal parameters by the steam superheater, for the wind power generation system, the electric power is all used for the electric energy consumption equipment first steam generator (electric heating driven), second steam generator (electric heating driven) and steam superheater, for the solar heat collection subsystem, the working medium circulation mode is solar heat storage flow, in this way, preferentially using electric energy to heat water / steam can improve the heat transfer temperature difference and realize full utilization of heat, and preferentially storing the heat generated by solar heat collection is beneficial to reduce energy loss;

[0038] ⑤, wind and light heat storage electric steam production mode: the wind power of the system is sufficient to meet the steam production demand, the steam production process is consistent with the independent electric heating mode, and the electric energy of the wind power generation system is used for the first steam generator (electric heating driven) and the second steam generator (electric heating driven) to generate steam, and the surplus electric power is used for the working medium heater to store in the high-temperature heat storage tank, and for the solar heat collection subsystem, the working medium flow mode is electric heat storage flow and solar heat storage flow at the same time;

[0039] ⑥, wind light storage complementary steam production mode: the wind light production capacity of the system can be less than the steam production demand, the steam production process is consistent with the complementary steam production mode, at this time the electric energy in the wind power generation system is used for the first steam generator (electric heating driven), if necessary, the power supply of the first steam generator (electric heating driven) and the second steam generator (electric heating driven) is ensured from the outside, for the solar energy heat collection subsystem, the working medium flow mode is in the solar energy and storage complementary flow, or the storage device independent heating flow when there is no solar energy collection.

[0040] Beneficial effects: the wind-light-storage complementary collaborative steam production and auxiliary heavy oil thermal recovery system and production process disclosed by the application has the following beneficial effects:

[0041] 1, make full use of solar energy and wind energy, such as renewable resources, to provide steam for heavy oil thermal recovery, replace the direct fossil fuel mode in traditional steam production, reduce the pollution to the environment, and significantly promote the development and utilization of renewable energy.

[0042] 2, by comprehensively utilizing the complementary characteristics of solar energy and wind energy, the volatility of single energy system is effectively reduced, and the stability of steam production is improved. According to the different characteristics of radiant heat energy and wind power generation electric energy, the differential complementary utilization is realized, the energy grade is matched, and the comprehensive cascade utilization is realized, the utilization efficiency of renewable energy is significantly improved, and the development cost is reduced.

[0043] 3, by increasing the heat storage device, the solar radiation energy and wind energy are stored as heat energy, the heat energy supply is guaranteed when there is no solar radiation at night, and the continuous production of steam is realized by inputting the electric energy of external power grid when the power supply is insufficient, the reliability of steam production under extreme weather conditions is guaranteed.

[0044] 4, the method can flexibly control and deploy the heat energy and electric energy in the system according to the production needs, the technical flexibility is high, the adaptability is strong, and better popularization and application can be obtained. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 It is a structure diagram of the wind-light-storage complementary collaborative steam production and auxiliary heavy oil thermal recovery system disclosed by the application;

[0046] Among them:

[0047] A- solar energy heat collection subsystem

[0048] B- wind power generation system

[0049] C- steam production subsystem

[0050] 1- solar energy heat collection mirror field 2- first working medium circulating pump

[0051] 3- first steam generator (heat exchanger)

[0052] 4-Second Steam Generator (Heat Exchanger)

[0053] 5-High-temperature thermal storage tank 6-Low-temperature thermal storage tank

[0054] 7-Second working fluid circulation pump; 8-Wind turbine generator set

[0055] 9-Electrical control device 10-External power grid

[0056] 11-First Steam Generator (Electrically Driven)

[0057] 12-Second Steam Generator (Electrically Driven)

[0058] 13-Working fluid heater; 14-Softened water storage tank

[0059] 15-Water supply pump 16-Steam injection well

[0060] 17-Central controller; 18-Steam superheater. Detailed Implementation

[0061] The specific embodiments of the present invention are described in detail below. Specific Implementation

[0063] like Figure 1 As shown, a wind-solar-storage complementary and synergistic steam production and auxiliary heavy oil thermal recovery system includes a solar thermal collector subsystem A, a wind power generator subsystem B, a steam production subsystem C, and an operation control subsystem. The solar thermal collector subsystem A collects solar radiation energy to provide clean thermal energy for steam production. The wind power generator subsystem B efficiently converts wind power energy into electrical energy and provides electrical energy to the system after adjusting the power parameters. The steam production subsystem C comprehensively utilizes thermal energy and electrical energy to produce steam that meets the needs of heavy oil thermal recovery, following the principle of matching energy quality. The operation control subsystem adjusts the operating status of each device in real time and dynamically optimizes the ratio of thermal energy to electrical energy supply during the steam production process to ensure a stable energy supply to the system and a coordinated match between energy consumption and steam production.

[0064] Solar thermal collector subsystem A consists of a solar thermal collector field 1 (parallel solar collector), a high-temperature thermal storage tank 5, a low-temperature thermal storage tank 6, a first working fluid circulation pump 2, a second working fluid circulation pump 7, and a circulation loop. The high-temperature thermal storage tank 5 and the low-temperature thermal storage tank 6 are combined to form a thermal storage device. Solar thermal collector subsystem A uses the parallel solar collector to gather dispersed solar energy into high-energy-flux-density thermal energy and transfer it to the heat-conducting working fluid. After absorbing heat, the working fluid, driven by the circulation pump, provides the thermal energy to the steam production subsystem C or enters the high-temperature thermal storage tank 5 and the low-temperature thermal storage tank 6 for storage.

[0065] Solar energy collector field 1 is used to concentrate low energy density solar energy into high energy flux density radiant energy, the collector can be selected from trough type, tower type, dish type and linear Fresnel type, the receiver converts the concentrated high energy flux density solar radiant energy into high temperature heat energy and transmits it to the heat conducting medium or water vapor, the receiver can be selected from vacuum heat collecting tube and cavity type according to the needs, the heat storage device stores the excess energy of the system in the form of heat energy to supplement the system energy supply when the system energy supply is insufficient, so as to reduce the energy fluctuation of the system, and the heat energy storage and release are switched by changing the circulation mode of the heat conducting medium.

[0066] Wind power generation system B is composed of wind turbine generator set 8, electric control device 9 and external power grid 10, the electric control device 9 includes transformer and power transmission equipment, the wind turbine generator set 8 obtains environmental wind power and realizes efficient conversion of kinetic energy into electric energy, the generated electric energy is adjusted by the electric control device 9 and provided to the system power consumption device, and the external power grid 10 is powered when the system electric energy is abundant, and vice versa, the external power grid 10 is used as a standby energy source to ensure the overall power supply of the system.

[0067] The wind turbine generator set 8 includes impeller, gear box, generator and tower, which is used to obtain environmental wind energy and efficiently convert wind energy into electric energy, the electric control device 9 includes transformer, power generation controller, heat exchange and power transmission device, which is used to control the voltage, current and phase parameters of the wind power generation process, provide electric energy for the system, and connect the external power grid 10 as a standby energy source for the system, and input electric energy from the external power grid when the system electric energy is insufficient, and correspondingly transmit the excess electric energy to the power grid.

[0068] Steam production subsystem C is composed of softened water storage tank 14, feed water pump 15, first steam generator (heat exchanger) 3, second steam generator (heat exchanger) 4, first steam generator (electric heating drive) 11, second steam generator (electric heating drive) 12 and control valve (a-f).

[0069] The steam production subsystem C is used to store softened feed water meeting the steam production standard, the feed water pump 15 provides the required pressure for steam injection, and the pressurized water enters the first steam generator (heat exchanger) 3, the second steam generator (heat exchanger) 4, the first steam generator (electric heating drive) 11 and the second steam generator (electric heating drive) 12, which are used to produce water vapor meeting the production requirements by direct heat exchange and electric heating; during the steam production process, the production process can be changed by adjusting the control valve of the steam production, so as to realize the matching of the steam production heat load and the system energy supply.

[0070] The operation control subsystem includes a central controller 17, and the control subsystem is divided into three control modules, as follows:

[0071] Control module A: Adjust the field of the collector to track the sun's movement and adjust the heat storage and release process of the solar thermal subsystem A.

[0072] Control module B: Adjust the wind power subsystem B and flexibly dispatch the power of the wind power subsystem B according to the steam production power needs.

[0073] Control module C: Cooperatively control the heat load and system energy supply matching relationship in the steam production process.

[0074] The central controller 17 uses an optimization algorithm to predict the system power generation and heat collection according to the real-time changes of wind and light resources, and to pre-adjust and optimize the energy supply changes that may occur. The high-grade wind power is used for the high-temperature stage of steam production, and the solar thermal energy is used for the relatively low-temperature heating stage. The wind power and solar thermal energy are matched with different quality energy required in different stages of steam production, and the energy utilization mode is optimized.

[0075] Further, the concentrated collector field is composed of multiple concentrated collector units, each unit including a concentrator, a collector, and a tracking drive device. A linear concentration method is used to track and collect solar energy. Solar radiation energy is concentrated into a vacuum heat pipe through a trough collector, and then the heat energy is transferred to a steam generator or stored in a high-temperature heat storage tank 5, realizing the storage and utilization of heat energy. Double-tank heat storage is used to realize heat storage and release. The heat storage medium can be molten salt or heat-conducting oil. According to the energy dispatching needs of the system, the heat-conducting medium from the low-temperature heat storage tank 6 is transported to the mirror field to absorb solar radiation heat during heat storage. The high-temperature medium after heat absorption is transported to the high-temperature heat storage tank 5 for heat storage. During heat release, the medium in the high-temperature heat storage tank 5 flows into the heat exchanger, and the medium after heat exchange flows into the low-temperature heat storage tank 6, thereby realizing the circulating process of heat storage and release.

[0076] The heat-conducting medium is sent by the first medium circulating pump 2 to the vacuum heat pipe of the solar heat collection subsystem A to absorb solar radiation heat. The high-temperature medium after heat absorption flows through the control valve a to enter the first steam generator (heat exchanger) 3 and the second steam generator (heat exchanger) 4. The low-temperature medium after heat exchange enters the circulating pump again for reciprocal circulation. The high-temperature medium after heat absorption of the solar collector field 1 can also enter the high-temperature heat storage tank 5 through the control valve a for heat storage. The heat storage part uses the double-tank heat storage method of heat tank and low-temperature heat storage tank 6. The high-temperature medium after heating is stored in the heat tank, and the low-temperature medium after heat exchange is stored in the low-temperature heat storage tank 6. In addition, the medium heater 13 uses the surplus power of the system to heat the low-temperature medium, converts the electric energy into heat energy, and stores it in the high-temperature heat storage tank 5.

[0077] Further, the medium circulation method includes the following five kinds:

[0078] 1) Steady state circulation flow: when the solar radiation heat collection is equal to the heat load of the first steam generator (heat exchanger) 3 and the second steam generator (heat exchanger) 4, the control valves a, b and the passages of the high-temperature thermal storage tank 5 and the low-temperature thermal storage tank 6 are closed, and the heat-conducting working medium is sequentially passed through each solar heat collecting unit in the trough type solar heat collecting mirror field 1 under the action of the first working medium circulating pump 2, absorbs solar radiation energy and transfers heat energy to the first steam generator (heat exchanger) 3 and the second steam generator (heat exchanger) 4 for steam production, forming a closed circulation;

[0079] 2) Solar heat storage flow: when the solar radiation heat collection is greater than the heat load demand of the first steam generator (heat exchanger) 3 and the second steam generator (heat exchanger) 4, adjust the control valve b, the first working medium circulating pump 2 transports the heat-conducting working medium from the low-temperature thermal storage tank 6 and the outlets of the first steam generator (heat exchanger) 3 and the second steam generator (heat exchanger) 4 to the solar heat collecting mirror field 1 to absorb solar radiation heat, then the working medium is divided into two parts through the control valve a, one part passes through the second steam generator (heat exchanger) 4 to meet the heat load demand of steam production, and the other part of the high-temperature working medium is transported to the high-temperature thermal storage tank 5;

[0080] 3) Electric heat storage flow: when the power supply of the wind turbine generator set 8 is surplus, the cooling working medium in the low-temperature thermal storage tank 6 is heated by the working medium heater 13 and enters the high-temperature thermal storage tank 5 for storage, and the electric heat storage and other heat storage and release processes in the high-temperature thermal storage tank 5 do not affect each other, and can be performed at the same time;

[0081] 4) Light storage complementary flow: when the solar radiation heat collection is less than the heat exchange demand of the first steam generator (heat exchanger) 3 and the second steam generator (heat exchanger) 4, part of the heat working medium needs to be supplemented from the high-temperature thermal storage tank 5, and through the cooperation of the first working medium circulating pump 2, the second working medium circulating pump 7 and the control valve a, the working medium of the solar heat collecting mirror field 1 and the high-temperature thermal storage tank 5 flows into the first steam generator (heat exchanger) 3 and the second steam generator (heat exchanger) 4, and the working medium after heat exchange is divided into two parts through the control valve b, one part flows into the low-temperature thermal storage tank 6, and the other part enters the trough type solar heat collecting mirror field 1 for recycling;

[0082] 5) Heat storage independent heating flow: when the solar heat collecting mirror field 1 cannot obtain radiation heat, the heat of the heat exchanger first steam generator (electric heating driven) 11 and the second steam generator (electric heating driven) 12 is entirely supplied by stored heat energy, at this time the passages of the control valves a, b and the solar heat collecting mirror field 1 are closed, and the high-temperature working medium in the high-temperature thermal storage tank 5 flows through the second working medium circulating pump 7, the first steam generator (heat exchanger) 3 and the second steam generator (heat exchanger) 4, and then flows into the low-temperature thermal storage tank 6 after cooling.

[0083] Further, the wind turbine 8 converts wind into electricity, and the generated electricity is transmitted to the power consumption equipment through the voltage transmission device. The first steam generator (electric heating driven) 11 and the second steam generator (electric heating driven) 12 driven by the electricity are used to produce steam, and the steam superheater 18 is used to adjust the thermal parameters of the injected steam. When the wind power is insufficient to meet the system power load demand, the electricity can be directly input from the external power grid 10. In the extreme case, the external power grid 10 can fully input electricity to meet the system steam production load demand. When the wind power is abundant, the working medium heater 13 heats the low-temperature working medium in the low-temperature heat storage tank 6 with the surplus electricity and transmits it to the high-temperature heat storage tank 5, so as to convert the electricity into heat energy storage. When the heat storage capacity reaches the upper limit, the remaining electricity is boosted by the electric control device 9 and supplied to the power grid.

[0084] Further, the steam heating process in the steam production subsystem C is adjusted by the control module B of the control subsystem. Under ideal environmental conditions, the feed water is softened and stored in the softened water storage tank, and after being softened, it is boosted by the feed water pump 15, and is superheated by the second steam generator (heat exchanger) 4 and the first steam generator (electric heating driven) 11. According to the energy quality difference between wind energy and light energy, the high-temperature water vapor meeting the injection standard is produced by using solar energy and wind power in stages, and finally is input into the injection well 16.

[0085] Further, in the control subsystem:

[0086] The control module A adopts the sun motion trajectory tracking. The solar radiation intensity and incident angle are collected by the sunlight sensor in real time, and the tracking signal is output after being calculated and processed by the central controller 17. The tracking driving device adjusts the light collection angle of the mirror field to ensure the best heat collection efficiency. At the same time, according to the energy regulation strategy, the first working medium circulating pump 2 and the control valves a and b are adjusted in time to control the flow and circulation mode of the working medium, so as to realize the switching of heat storage and heat release of the heat storage device. The specific adjustment mode is as follows:

[0087] The control module B adjusts the operation state of the wind turbine 8 according to the wind direction parameters obtained by the wind sensor, and predicts the wind power in advance to pre-schedule the power supply.

[0088] The control module C optimizes the energy utilization mode in the steam production process according to the energy supply conditions of the solar heat collection subsystem A and the wind power subsystem B, and adjusts the control valves f, e and the control valves c, d and the feed water pump 15 in real time to adjust the consumption ratio of heat energy and electric energy in the steam production, and feeds the parameters of the injected steam to the control system for timely adjustment. The electric energy generated by the wind turbine generator set 8 is first transmitted to the first steam generator (electric heating drive) 11 and the second steam generator (electric heating drive) 12 through the electric control device 9 to be converted into heat energy for steam production. The surplus electric energy is stored as heat energy through the working medium heater 13. Finally, the electric energy exceeding the heat storage limit is boosted and transmitted to the external power grid 10. When the system power load cannot be met by the wind power system, the electric energy is selected from the external power grid to ensure the continuity of steam production.

[0089] Further, the control module B can control the system to adopt the following six types of operation modes:

[0090] ①, independent light-heat mode: the wind power of the system is zero, and the heat load of steam production is provided by the first steam generator (heat exchanger) 3 and the second steam generator (heat exchanger) 4. At this time, the control valve f, the control valve d and the electrically driven first steam generator (electric heating drive) 11 and the second steam generator (electric heating drive) 12 are closed. The production process of steam is as follows: the softened water tank 14 is pressurized by the feed water pump 15, then heated by the first steam generator (heat exchanger) 3 and the second steam generator (heat exchanger) 4 to become high-temperature steam, and then adjusted by the steam superheater 18 to finally be injected into the well. The flow mode of the heat-conducting working medium is as follows: steady-state circulation, solar heat storage, and solar heat and heat storage complementation;

[0091] ②, independent electric heating mode: when the solar heat collection and heat storage of the system is zero, the heat load of steam production is provided by the first steam generator (heat exchanger) 3 and the second steam generator (heat exchanger) 4. At this time, the control valve f, d and the first steam generator (heat exchanger) 3 and the second steam generator (heat exchanger) 4 are closed. The production process of steam is as follows: the softened water tank 14 is pressurized by the feed water pump 15, then heated by the first steam generator (heat exchanger) 3 and the second steam generator (heat exchanger) 4 to become high-temperature steam, and then adjusted by the steam superheater 18 to finally be injected into the well. When the power supply of the wind turbine generator set 8 is insufficient, it is supplemented by the external power grid 10. The circulation mode of the heat-conducting working medium is electric heat storage circulation or stop circulation;

[0092] ③, without energy storage wind-solar complementary steam production mode: the wind-solar energy supply of the system just meets the steam production heat load demand, the steam production process is: softened water flows through the feedwater pump 15, control valve f, the second steam generator (heat exchanger) 4, and then is divided into two parts by control valve c, one part passes through control valve d and the first steam generator (electric heating driven) 11, and the other part passes through the first steam generator (heat exchanger) 3 for heating, and then is jointly injected into control valve e, and finally is injected into the wellbore, because the heat source temperature generated by the thermoelectric effect is higher than that of the solar heat collection, the electric energy generated by the wind power generation is mainly used for the high-temperature heating section of the first steam generator (electric heating driven) 11 and the steam superheater 18, and the heat of the heat conducting medium is mostly used for the low-temperature heating section of the steam, so as to improve the heat exchange temperature difference and realize full utilization of heat, at this time the flow mode of the heat conducting medium is steady-state circulating flow;

[0093] ④, light heat storage wind-solar complementary steam production mode: when the wind-solar energy supply of the system is greater than the steam production heat load demand, the steam production process is: softened water is pressurized by the working medium pump, and after flowing through the control valve f, the water is divided into two parts according to the principle of preferentially using electric heating, one part flows into the first steam generator (electric heating driven) 11, and the other part flows into the first steam generator (heat exchanger) 3, and the water vapor at the outlet of the second steam generator (heat exchanger) 4 is divided into two parts by the control valve c, one part is heated by the first steam generator (heat exchanger) 3, and the other part is heated by the steam generator, and the superheated steam is finally combined by the control valve e, and after adjusting the thermal parameters by the steam superheater 18, it is injected into the well, the wind power electronic system B, and the electric power is used for the electric energy consumption equipment first steam generator (electric heating driven) 11, second steam generator (electric heating driven) 12 and steam superheater 18, the solar heat collection subsystem A, the working medium circulation mode is solar heat storage flow, in this way, preferentially using electric energy to heat water / steam can improve the heat exchange temperature difference and realize full utilization of heat, and preferentially storing the heat generated by solar heat collection can reduce energy loss;

[0094] ⑤, wind-solar heat storage electric steam production mode: the wind power of the system is sufficient to meet the steam production demand, the steam production process is consistent with the independent electric heating mode, and the electric energy of the wind power electronic system B is used for the first steam generator (electric heating driven) 11 and the second steam generator (electric heating driven) 12 to generate steam, and the surplus electric power is used for the working medium heater 13 to store in the high-temperature heat storage tank 5, and the solar heat collection subsystem A, the working medium flow mode is electric heat storage flow and solar heat storage flow at the same time;

[0095] ⑥, wind and light complementary steam production mode: the wind and light heat production capacity of the system can be less than the steam production demand, the steam production process is consistent with the complementary steam production mode, at this time the electric energy in the wind power generation system B is all used for the first steam generator (electric heating driven) 11, if necessary, the power from the outside is transmitted to ensure the power supply of the first steam generator (electric heating driven) 11 and the second steam generator (electric heating driven) 12, for the solar heat collection subsystem A, the working medium flow mode is in the solar energy and heat storage complementary flow, or in the heat storage device independent heat flow without solar energy collection.

[0096] In summary:

[0097] Make full use of solar energy and wind energy such as renewable resources to provide steam for heavy oil thermal recovery, replace the direct fuel fossil fuel mode in traditional steam production, reduce the pollution to the environment, which will significantly promote the development and utilization of renewable energy.

[0098] By comprehensively utilizing the complementary characteristics of solar energy and wind energy, the volatility of single energy system is effectively reduced, and the stability of steam production is improved. According to the different characteristics of radiant heat energy and wind power electric energy, differential complementary utilization is realized, the energy grade is matched, and comprehensive cascade utilization is realized, which significantly improves the utilization efficiency of renewable energy and reduces the development cost.

[0099] By increasing the heat storage device, the solar radiation energy and wind energy are stored as heat energy, which ensures the heat energy supply when there is no solar radiation at night, and realizes the continuous production of steam by inputting the electric energy from the external power grid 10 when the power supply is insufficient, which guarantees the reliability of steam production under extreme weather conditions.

[0100] The method can flexibly control and allocate the heat energy and electric energy in the system according to the production needs, has high technical flexibility and strong adaptability, and can be well popularized and applied.

[0101] The above has made a detailed description of the embodiments of the present application. However, the present application is not limited to the above embodiments, and various changes can be made within the knowledge range of ordinary skilled persons in the art without departing from the purpose of the present application.

Claims

1. A wind-solar-storage complementary and synergistic steam production and auxiliary heavy oil thermal recovery system, characterized in that, The system includes a solar thermal collection subsystem (A), a wind power generation subsystem (B), a steam production subsystem (C), and an operation control subsystem. The solar thermal collection subsystem (A) collects solar radiation energy to provide clean thermal energy for steam production. The wind power generation subsystem (B) efficiently converts wind power energy into electrical energy and provides electrical energy to the system after adjusting the power parameters. The steam production subsystem (C) comprehensively utilizes thermal energy and electrical energy to produce steam that meets the needs of heavy oil thermal recovery, following the principle of matching energy quality. The operation control subsystem adjusts the operating status of each device in real time and dynamically optimizes the ratio of thermal energy to electrical energy supply during steam production to ensure a stable energy supply to the system and a coordinated match between energy consumption and steam production. The solar thermal collector subsystem (A) consists of a solar thermal collector field (1), a high-temperature thermal storage tank (5), a low-temperature thermal storage tank (6), a first working fluid circulation pump (2), a second working fluid circulation pump (7), and a circulation loop. The high-temperature thermal storage tank (5) and the low-temperature thermal storage tank (6) are combined to form a thermal storage device. The solar thermal collector subsystem (A) uses a trough collector to gather the dispersed solar energy into high-energy-flux-density thermal energy and transfer it to the heat-conducting working fluid. After absorbing heat, the working fluid, driven by the circulation pump, provides the thermal energy to the steam production subsystem (C) or enters the high-temperature thermal storage tank (5) and the low-temperature thermal storage tank (6) for storage. The solar thermal collector field (1) receives and converts the high energy flux density solar radiation energy into high temperature heat energy, which is then transferred to the heat-conducting working medium or water vapor. The receiver can be selected as a vacuum collector tube or a cavity type as needed. Wind power generation system (B): It consists of wind turbine generator set (8), electrical control device (9) and external power grid (10). The electrical control device (9) includes transformer and power transmission equipment. The wind turbine generator set (8) obtains environmental wind power and realizes efficient conversion of kinetic energy into electrical energy. The generated electrical energy is regulated by the electrical control device (9) and then supplied to the system's electrical devices. The electrical control device (9) provides electrical energy to the system and connects to the external power grid (10) as a backup energy source for the system. When the system's electrical energy is insufficient, electrical energy is input from the external power grid, and correspondingly, the surplus electrical energy is transmitted to the power grid. Steam production subsystem (C): consists of softened water storage tank (14), feed water pump (15), first steam generator heat exchanger (3), second steam generator (4), third steam generator (11), fourth steam generator (12), and control valve (af); The steam production subsystem (C) is used to store softened feedwater that meets the steam production standards. The feedwater pump (15) provides the required pressure for steam injection. The pressurized water enters the first steam generator heat exchanger (3), the second steam generator (4), the third steam generator (11), and the fourth steam generator (12). The operation control subsystem includes a central controller (17), and the operation control subsystem is divided into three control modules, as shown below: Control module A: It uses solar motion trajectory tracking to adjust the focusing angle of the solar collector mirror field and adjusts the thermal energy storage and release process of the solar collector subsystem (A); Control module B: Adjusts the wind power generator system (B) and flexibly dispatches the power of the wind power generator system (B) according to the system's steam power generation needs; Control module C: Coordinates the matching relationship between heat load and system energy supply in the steam production process.

2. The wind-solar-storage complementary synergistic steam production and auxiliary heavy oil thermal recovery system according to claim 1, characterized in that, The concentrating solar collector field consists of multiple concentrating solar collector units. Each unit includes a concentrating mirror, a solar collector, and a tracking drive device. It adopts a linear concentrating method to track and collect solar energy. Solar radiation energy is gathered by the trough-type solar collector to the vacuum solar collector tube, and then the heat transfer medium transfers the heat energy to the steam generator or stores it in the high-temperature heat storage tank (5) to realize the storage and utilization of heat energy. The dual-tank heat storage is used to realize the storage and release of heat energy. According to the energy scheduling needs of the system, when storing heat, the heat transfer medium from the low-temperature heat storage tank (6) is transported to the mirror field to absorb solar radiation heat. The high-temperature medium after absorbing heat is transported to the high-temperature heat storage tank (5) for heat storage. When releasing heat, the medium in the high-temperature heat storage tank (5) flows into the heat exchanger, and the medium after heat exchange flows into the low-temperature heat storage tank (6) to realize the medium circulation process of heat storage and heat release.

3. The wind-solar-storage complementary and synergistic steam production and auxiliary heavy oil thermal recovery system according to claim 2, characterized in that, The working fluid circulation methods include the following five types: 1) Steady-state circulation: When the solar radiation heat collection is equal to the heat load of the first steam generator heat exchanger (3) and the second steam generator (4), the passages of control valves a and b to the high-temperature heat storage tank (5) and the low-temperature heat storage tank (6) are closed. Under the action of the first working fluid circulation pump (2), the heat transfer medium passes through each solar heat collection unit in each trough solar heat collection mirror field (1) in sequence, absorbs solar radiation energy and transfers the heat energy to the first steam generator heat exchanger (3) and the second steam generator (4) for steam production, forming a closed loop; 2) Solar thermal storage flow: When the solar radiation heat collection is greater than the heat load demand of the first steam generator heat exchanger (3) and the second steam generator (4), the control valve b is adjusted, and the first working fluid circulation pump (2) transports the heat-conducting working fluid from the outlet of the low temperature heat storage tank (6) and the first steam generator heat exchanger (3) and the second steam generator (4) to the solar thermal collector mirror field (1) to absorb solar radiation heat. Then the working fluid is divided into two parts by the control valve a. One part passes through the second steam generator (4) to meet the heat load demand of steam production, and the other part of the high temperature working fluid is transported to the high temperature heat storage tank (5). 3) Electric thermal storage flow: When the power supply of the wind turbine generator set (8) is excessive, the cooling working medium in the low temperature thermal storage tank (6) is heated by the working medium heater (13) and stored in the high temperature thermal storage tank (5). The electric thermal storage and other heat storage and release processes in the high temperature thermal storage tank (5) do not affect each other and are carried out simultaneously. 4) Photovoltaic-storage complementary flow: When the solar radiation heat collection is less than the heat exchange requirements of the first steam generator heat exchanger (3) and the second steam generator (4), it is necessary to supplement some working fluid from the high-temperature heat storage tank (5). The working fluid of the solar collector field (1) and the high-temperature heat storage tank (5) are regulated by the first working fluid circulation pump (2), the second working fluid circulation pump (7) and the control valve a, so that the working fluid of the solar collector field (1) and the high-temperature heat storage tank (5) flows into the first steam generator heat exchanger (3) and the second steam generator (4). After heat exchange, the working fluid is divided into two parts by the control valve b. One part flows into the low-temperature heat storage tank (6) and the other part enters the trough solar collector field (1) for recirculation. 5) Independent heat supply flow for heat storage: When the solar collector mirror field (1) cannot obtain radiant heat, the heat of the third steam generator (11) and the fourth steam generator (12) of the heat exchanger is supplied by the stored heat energy. At this time, the passage between the control valves a and b and the solar collector mirror field (1) is closed. The high-temperature working fluid in the high-temperature heat storage tank (5) flows through the second working fluid circulation pump (7), the first steam generator heat exchanger (3), and the second steam generator (4), and flows into the low-temperature heat storage tank (6) after cooling.

4. The wind-solar-storage complementary and synergistic steam production and auxiliary heavy oil thermal recovery system according to claim 3, characterized in that, The wind turbine generator set (8) converts wind power into electrical energy, and the generated electrical energy is transmitted to the power-consuming equipment via a transformer and transmission device. The third steam generator (11) and the fourth steam generator (12) driven by electrical energy are used to produce steam. The steam superheater (18) is used to make final adjustments to the thermal parameters of the injected steam. When the wind power generation is insufficient to meet the system's power load demand, the power is directly input from the external power grid (10). In extreme cases, all the power is input from the external power grid (10) to meet the system's steam production load demand. When the wind power generation is surplus, the working fluid heater (13) heats the low-temperature working fluid in the low-temperature heat storage tank (6) with the surplus power and transmits it to the high-temperature heat storage tank (5) to convert electrical energy into heat energy for storage. When the heat storage capacity reaches the upper limit, the remaining electrical energy is boosted by the electrical control device (9) and supplied to the power grid.

5. The wind-solar-storage complementary synergistic steam production and auxiliary heavy oil thermal recovery system according to claim 1, characterized in that, In the steam production subsystem (C), the steam heating process is regulated by the control module B of the control subsystem. Under ideal environmental conditions, the feedwater is softened and stored in a softened water storage tank. After softening, it is pressurized by the feedwater pump (15) and superheated by the second steam generator (4) and the third steam generator (11). Based on the energy quality difference between wind energy and solar energy, high-temperature steam that meets the injection and production standards is produced by using solar energy and wind power in stages and finally input into the steam injection well (16).

6. The wind-solar-storage complementary and synergistic steam production and auxiliary heavy oil thermal recovery system according to claim 5, characterized in that, In the operation control subsystem: The control module A adopts solar motion trajectory tracking. The solar radiation intensity and incident angle are collected in real time by the solar light sensor. After being calculated and processed by the central controller (17), the tracking signal is output. The tracking drive device adjusts the focusing angle of the mirror field to ensure the best heat collection efficiency. At the same time, according to the energy adjustment strategy, the first working fluid circulation pump (2) and control valves a and b are adjusted in time to control the flow rate and circulation mode of the working fluid, so as to realize the switching of heat storage and heat release of the heat storage device. The specific adjustment method is as follows: The control module B adjusts the operating status of the wind turbine generator set (8) based on the wind force and direction parameters obtained by the wind force sensor, and predicts the wind power generation in advance to schedule the power supply in advance. The control module C optimizes the energy utilization mode in the steam production process according to the power supply of the solar thermal collector subsystem (A) and the wind power generator system (B), and adjusts the control valves f, e, c, d and the feed water pump (15) in real time to adjust the ratio of heat energy and electrical energy consumption in steam production. The parameters of the injected steam are fed back to the control system for timely adjustment. The electrical energy generated by the wind turbine generator set (8) is first delivered to the third steam generator (11) and the fourth steam generator (12) through the electronic control device (9) and converted into heat energy for steam production. The excess electrical energy is stored as heat energy through the working fluid heater (13). Finally, the electrical energy exceeding the heat storage limit is boosted and delivered to the external power grid (10). When the system's power load cannot be met by the wind power generation system, the power energy is selected to be input from the external power grid to ensure the continuity of steam production.

7. The wind-solar-storage complementary and synergistic steam production and auxiliary heavy oil thermal recovery system according to claim 6, characterized in that, The control module B control system adopts the following six operating modes: ① Independent solar thermal mode: The wind power generation of the system is zero. The heat load of steam production is provided by the heat exchanger of the first steam generator (3) and the second steam generator (4). At this time, the passage of control valve f, control valve d and the electrically driven third steam generator (11) and fourth steam generator (12) is closed. The steam production process is as follows: the softened water storage tank (14) is pressurized by the feed water pump (15), and then heated into high temperature steam by the heat exchanger of the first steam generator (3) and the second steam generator (4) in sequence. After the parameters are adjusted by the steam superheater (18), it is finally injected into the well. The heat transfer medium flows in three ways: steady-state circulation flow, solar thermal storage flow, and solar thermal and thermal storage complementary flow. ② Independent electric heating mode: When the solar energy collection and storage heat of the system are zero, the heat load of steam production is provided by the first steam generator heat exchanger (3) and the second steam generator (4). At this time, the passage between the control valves f and d and the first steam generator heat exchanger (3) and the second steam generator (4) is closed. The steam production process is as follows: the softened water storage tank (14) is pressurized by the water pump (15), and then passes through the first steam generator heat exchanger (3) and the second steam generator (4) in sequence to become high temperature steam. After the parameters are adjusted by the steam superheater (18), it is finally injected into the well. When the power supply of the wind turbine generator set (8) is insufficient, it is supplemented by the external power grid (10). The heat transfer medium circulation mode is electric heat storage flow or stop circulation. ③ Wind-solar hybrid steam generation mode without energy storage: The wind and solar energy supply of the system just meets the heat load demand of steam production. The steam production process is as follows: Softened water flows through the feed water pump (15), control valve f, second steam generator (4), and is then divided into two parts by control valve c. One part passes through control valve d and third steam generator (11), and the other part is heated by the heat exchanger (3) of the first steam generator. Then they all flow into control valve e and are finally injected into the well. Since the heat source temperature generated by the thermoelectric effect is higher than that of the solar heat source, the electrical energy generated by wind power generation is mainly used for the high-temperature heating section of the third steam generator (11) and steam superheater (18). The heat of the heat transfer medium is mostly used for the low-temperature heating section of steam, thereby improving the heat exchange temperature difference and realizing the full utilization of heat. At this time, the flow mode of the heat transfer medium is steady-state circulation flow. ④ Solar-Feng-Gen Complementary Steam Generation Mode: When the solar and wind energy supply of the system exceeds the heat load demand for steam production, the steam production process is as follows: Softened water is pressurized by a working fluid pump and flows through control valve f. According to the principle of prioritizing electric heating, the water is divided into two parts. One part flows into the third steam generator (11), and the other part flows into the heat exchanger (3) of the first steam generator. The steam at the outlet of the second steam generator (4) is divided into two parts by control valve c. One part is heated by the heat exchanger (3) of the first steam generator, and the other part is heated by the steam generator. The superheated steam is finally combined through control valve e and the heat is adjusted by the steam superheater (18). After the parameters are injected into the well, the power is used for the wind power generation system (B), and all the electricity is used for the third steam generator (11), the fourth steam generator (12) and the steam superheater (18). For the solar thermal collector subsystem (A), the working fluid circulation mode is solar thermal storage flow. In this mode, the electrical energy is preferentially used to heat water / steam to increase the heat exchange temperature difference and make full use of the heat. The heat generated by the solar thermal collector is preferentially stored because the storage of electrical energy requires first heating the molten salt through the working fluid electric heater, and then the molten salt exchanges heat with the water, which is a secondary heating. Preferential storage of solar thermal collector heat is beneficial to reduce energy loss. ⑤ Wind-solar thermal storage and steam generation mode: The wind power of the system is sufficient to meet the steam production demand. The steam production process is consistent with the independent electric heating mode ②. In addition to using the power of the wind power generation system (B) to generate steam in the third steam generator (11) and the fourth steam generator (12), the surplus power is used for the working fluid heater (13) and stored in the high temperature heat storage tank (5). For the solar thermal collector subsystem (A), the working fluid flow mode is that the electric thermal storage flow and the solar thermal storage flow are carried out simultaneously. ⑥ Wind-solar-storage complementary steam generation mode: When the wind and solar heat generation capacity of the system is less than the steam production demand, the steam production process is consistent with the complementary steam generation mode. At this time, all the electrical energy in the wind power generation system (B) is used for the third steam generator (11). If necessary, external power is transmitted to ensure the power supply of the third steam generator (11) and the fourth steam generator (12). For the solar thermal collector subsystem (A), the working fluid flow mode is in the complementary flow of solar energy and thermal storage, or the thermal storage device independently supplies heat when there is no solar thermal collection.

8. The wind-solar-storage complementary and synergistic steam production and auxiliary heavy oil thermal recovery system according to claim 1, characterized in that, The solar thermal collector field (1) is used to concentrate solar energy with low energy density into radiation energy with high energy flux density. The heat collection methods are trough, tower, dish and linear Fresnel.

9. The wind-solar-storage complementary and synergistic steam production and auxiliary heavy oil thermal recovery system according to claim 1, characterized in that, The heat storage device stores the system's surplus energy in the form of heat energy, which is then used to supplement the system's energy supply when it is insufficient, thereby reducing system energy fluctuations. The storage and release of heat energy are switched by changing the circulation mode of the heat transfer medium.

10. A wind-solar-storage complementary and synergistic steam production and auxiliary heavy oil thermal recovery system according to claim 1, characterized in that, In the wind power generation system (B), when the system has surplus power, it supplies power to the external power grid (10); otherwise, the external power grid (10) serves as a backup energy source for the wind power generation system (B) to ensure the overall power supply of the system.

11. The wind-solar-storage complementary and synergistic steam production and auxiliary heavy oil thermal recovery system according to claim 1, characterized in that, The wind turbine generator set (8) includes an impeller, a gearbox, a generator, and a tower, and is used to acquire ambient wind energy and efficiently convert wind energy into electrical energy.

12. The wind-solar-storage complementary and synergistic steam production and auxiliary heavy oil thermal recovery system according to claim 1, characterized in that, In the steam production subsystem (C), steam that meets production requirements is produced by direct heat exchange and electric drive heating. During the steam production process, the production process is changed by adjusting the control valve of steam production, so as to achieve a match between the steam production heat load and the system energy supply.

13. The wind-solar-storage complementary and synergistic steam production and auxiliary heavy oil thermal recovery system according to claim 1, characterized in that, The central controller (17) uses an optimization algorithm to predict the power generation and heat collection of the system based on the real-time changes of wind and solar resources, and to pre-adjust and optimize the possible changes in energy supply. It uses high-quality wind power for the high-temperature stage of steam production, and solar thermal energy for the relatively low-temperature heating stage, so that wind power and solar thermal energy can be matched with the different qualities of energy required for different stages of steam production, and optimize the energy utilization method.

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