A solar steam production system for assisting heavy oil thermal recovery

Abstract

The present application relates to a kind of solar steam production systems for assisting heavy oil thermal recovery.A kind of solar steam production systems for assisting heavy oil thermal recovery includes solar energy collection subsystem, steam production subsystem, heat storage combustion supplementing subsystem and operation control subsystem.Clean renewable solar energy is used instead of traditional fossil fuel to produce water vapor for thermal recovery, which meets the development trend of energy transformation, achieves the purpose of saving fossil energy and reducing pollutant emissions, and overcomes the disadvantages of discontinuity and instability of solar energy through the optimized complementary cooperation of non-concentrating / concentrating solar energy, boiler and heat storage, which can realize the continuous and stable operation of solar steam production system, and the method of heating low-temperature feedwater by non-concentrating solar collector and further heating steam production by single-axis tracking solar energy fully utilizes the grade attribute of different heat sources, realizes the "temperature matching, cascade utilization" of energy, reduces irreversible loss and improves the overall energy utilization efficiency of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to a solar steam production process, in particular to a solar steam production system for assisting heavy oil thermal recovery. BACKGROUND

[0002] With the continuous development of the economic society, the demand for energy of human beings is rapidly increasing. According to the World Energy Statistics Yearbook published by the British Petroleum Company, the global primary energy consumption in 2019 reached 583.9x1018J, of which the oil consumption accounted for the highest proportion, reaching 33.1%. However, the current shortage of oil resources has affected the rapid development of the economic society. As an important oil resource, heavy oil accounts for a large proportion in the total world oil reserves, and the green and efficient exploitation of heavy oil is of great significance to the healthy and rapid development of the oil industry.

[0003] Due to the characteristics of high density and viscosity, heavy oil brings great difficulties to its exploitation, gathering and processing. Thermal oil recovery technology uses heat to increase the temperature of the oil layer, reduce the viscosity of heavy oil, and thus improve the flowability of heavy oil, which is considered as one of the advanced enhanced oil recovery technologies and has been widely used in the global oil industry. The main methods of heavy oil thermal recovery include steam huff and puff, steam flooding, fire-flood, hot water flooding, etc. Steam huff and puff generally needs to continuously inject steam into the oil layer for several days to several tens of days, and then shut down for 2-3 days to allow the heat to diffuse in the oil layer, so that the steam condenses, and then the well is opened for production. Due to its relative simplicity, steam huff and puff has the advantages of simple construction and strong practicability, and has become the main heavy oil recovery technology. However, due to the limited heating radius, the recovery rate of steam huff and puff is limited, generally at 15-20%. Steam flooding refers to continuously injecting steam into the oil layer to heat the oil layer with high-temperature steam, thereby improving the flowability of heavy oil and driving heavy oil to the production well for recovery. Steam flooding is a necessary stage for further improving the recovery rate of heavy oil reservoirs after steam huff and puff. Due to its continuous provision of heat to the formation, the steam consumption is much larger than that in the steam huff and puff stage, but it can increase the recovery rate by 20%-30%. Steam huff and puff and steam flooding are the two most widely used heavy oil thermal recovery schemes at present.

[0004] The ratio of the oil produced to the steam injected during the heavy oil development process is called the steam-oil ratio, and the average steam-oil ratio during the entire heavy oil production process is generally between 0.3 and 0.5, and the steam demand is large, and the cost of steam production accounts for 45% to 60% of the cost of crude oil production. The traditional steam generator produces heat by burning fossil fuels such as oil and natural gas, and uses a boiler to heat the water to produce steam that meets the requirements. Therefore, oil fields have the dual identity of being both a large energy producer and a large energy consumer, and the energy consumption of oil field heating furnaces accounts for about 70% of the total energy consumption of oil fields. Using traditional steam generation methods to produce heavy oil wastes valuable non-renewable resources and emits pollutants. Therefore, it is urgent to find a clean and efficient renewable energy source to assist or even replace traditional steam injection boilers for producing steam for heavy oil thermal recovery.

[0005] Solar energy is an inexhaustible renewable energy source, and has the characteristics of being clean and renewable, and widely distributed. Its large-scale application can reduce dependence on fossil fuels and effectively reduce pollutant emissions. China has abundant solar energy resources, and more than 2 / 3 of the country's annual sunshine hours are more than 2000h, and the annual solar radiation of various regions is about 930-2330kW·h / m2, and the average solar radiation distribution is high in the west and low in the east. The Qinghai-Tibet Plateau, northern Gansu, northern Ningxia and other regions have abundant solar energy resources, with annual sunshine hours exceeding 3000 hours. Most of China's heavy oil resources are stored in areas with available solar energy resources, and most oil fields are located in sparsely populated flat areas, providing good conditions for the application of solar energy to heavy oil production.

[0006] Due to the low energy density of solar energy, solar energy needs to be concentrated for use to obtain high-temperature heat energy, and this process requires the use of a concentrating solar collector. The solar energy concentrating system mainly includes movable mirrors and solar tracking devices, and can be divided into parabolic trough, linear Fresnel, tower and dish types according to the type of concentration. The first two types use linear concentration, and the last two types use point concentration. Among them, the application range of the trough type solar collector is the most widely used. The successful application of solar energy in the field of thermal power generation shows that it is fully feasible to produce steam that meets the thermal recovery parameters. Using solar energy to produce water vapor for heavy oil thermal recovery can reduce the consumption of fossil fuels, reduce the energy consumption and pollutant emissions of the heavy oil production process, and is of great significance for energy saving and emission reduction, and finds a new breakthrough point for the green and healthy development of the oil industry.

[0007] Therefore, the application of solar energy to produce heavy oil thermal recovery water vapor has good development prospects, but due to the inherent discontinuity and instability of solar energy, how to use solar energy for long-term and stable heavy oil thermal recovery has become a major problem. SUMMARY

[0008] The application aims at the deficiency of the prior art and provides a solar steam production system for assisting thick oil thermal recovery, which overcomes the problems of unstable system operation caused by solar energy fluctuation through heat storage and supplementary combustion, and realizes continuous production of thermal recovery steam and green economic development of thick oil resources.

[0009] The solar steam production system for assisting thick oil thermal recovery comprises a solar heat collection subsystem, a steam production subsystem, a heat storage and supplementary combustion subsystem and an operation control subsystem, the steam production subsystem receives solar heat energy collected by the solar heat collection subsystem, and the heat storage and supplementary combustion subsystem is started in time under the regulation and control of the operation control subsystem and with the change of solar direct radiation.

[0010] The solar heat collection subsystem comprises a non-concentrating solar heat collector, a linear concentrating solar heat collector mirror field and a heat conducting working medium circulating pump, wherein the non-concentrating solar heat collector uses absorbed solar energy to heat softened feed water flow, and then produces high-temperature heat conducting working medium by the linear concentrating solar heat collector mirror field, and the feed water flow produces qualified water vapor after high-temperature heat exchange.

[0011] The steam production subsystem comprises a feed water softening device, a feed water pump, a steam generator and a steam superheater, the softened water is preheated by the non-concentrating solar heat collector, the feed water pump increases the feed water pressure according to the injection and recovery steam parameter demand, and then the steam generator and the steam superheater heat the feed water into high-temperature water vapor meeting the thermal recovery parameter requirements by fully absorbing the heat of the high-temperature heat conducting working medium provided by the linear concentrating solar heat collector mirror field.

[0012] The heat storage and supplementary combustion subsystem comprises a heat storage and release heat exchanger, a high-temperature heat storage tank, a low-temperature heat storage tank and a supplementary combustion boiler, according to the heat load of the steam generator and the steam superheater and the real-time solar energy resource, part of the high-temperature heat conducting working medium heated by the linear concentrating solar heat collector mirror field is stored by heat exchange with the working medium in the high-temperature heat storage tank and the low-temperature heat storage tank, and is also released and utilized according to real-time demand, and the supplementary combustion boiler is started when the solar radiation intensity is insufficient or there is no solar radiation to ensure stable and reliable production of steam.

[0013] The operation control subsystem comprises operation parameter sensing detection, a calculation control unit and a system operation adjustment and execution action device, and can control valve a, valve b, valve c, valve d, valve e, valve f, valve g, valve h, valve i, valve k, the heat conducting working medium circulating pump, the feed water pump and the crude oil gathering and transportation pump, and adjusts the system operation mode according to the injection parameter demand of the steam injection device and the change of solar energy.

[0014] As a preferred scheme of the solar steam production system for assisting heavy oil thermal recovery in the application, in the solar heat collection subsystem, valve i and h are adjusted according to the solar radiation intensity; when there is solar radiation, the water flow is preheated by the non-concentrating solar heat collector and then enters the water pump; the water flow is preheated by the non-concentrating solar heat collector with low heat collection temperature, and then the heat conduction working medium at the outlet of the linear concentrating solar heat collector field is heated to produce steam, so that the solar heat energy is used in stages, and the irreversible loss is reduced.

[0015] As a preferred scheme of the solar steam production system for assisting heavy oil thermal recovery in the application, in the solar heat collection subsystem, according to the solar radiation intensity, the operating parameters of the heat conduction working medium circulating pump are adjusted to control the flow rate and outlet pressure of the heat conduction working medium in the vacuum heat collection tube, reduce the heat collection loss, and ensure the heat collection effect.

[0016] As a preferred scheme of the solar steam production system for assisting heavy oil thermal recovery in the application, the heat conduction working medium can be selected from heat conducting oil, low melting point molten salt, or water / steam directly used in a direct expansion mode.

[0017] As a preferred scheme of the solar steam production system for assisting heavy oil thermal recovery in the application, in the steam production subsystem, during the steam production process, the operating control subsystem optimizes the heat transfer process of the heat conduction working medium according to the solar radiation and the heat storage, and controls the water supply parameters by the water pump to ensure the steam production effect.

[0018] As a preferred scheme of the solar steam production system for assisting heavy oil thermal recovery in the application, a heat storage device is arranged in the heat storage combustion supplementing subsystem.

[0019] During heat storage, the heat conduction working medium at the outlet of the linear concentrating solar heat collector field enters the heat storage / heat release heat exchanger and transfers heat to the heat storage working medium in the low-temperature heat storage tank, and the heated heat storage working medium is stored in the high-temperature heat storage tank to store heat energy.

[0020] During heat release, the heat storage process is reversely operated, the heat storage working medium from the high-temperature heat storage tank heats the heat conduction working medium in the heat storage / heat release heat exchanger, and the heat conduction working medium circulates in the loop to produce water steam.

[0021] As a preferred scheme of the solar steam production system for assisting heavy oil thermal recovery in the application, the heat storage working medium can be selected from heat conducting oil or molten salt, and the system flow process pipeline circulation is adjusted according to the difference between the heat conduction working medium and the heat storage working medium.

[0022] As a preferred scheme of the solar steam production system for assisting heavy oil thermal recovery in the application: in the heat accumulating and combustion supplementing subsystem, when the solar radiation is sufficient, the feedwater flow is sufficiently preheated, the combustion supplementing boiler is in a hot backup state, and through the control of the valve f and the valve e, the high-temperature heat conducting medium at the outlet of the linearly concentrating solar collector field is used to supply heat energy to the steam generator and the steam superheater to produce high-temperature steam.

[0023] As a preferred scheme of the solar steam production system for assisting heavy oil thermal recovery in the application: the heat accumulating and combustion supplementing subsystem occupies the combustion supplementing boiler, which is used as a system operation guarantee device, and the fuel for combustion includes natural gas, diesel and coal, and the combustion supplementing boiler can also be adjusted to be an electrically driven boiler according to the actual demand of the place.

[0024] The control mode of the flow rate and the outlet pressure of the heat conducting medium in the vacuum heat collecting tube of the solar steam production system for assisting heavy oil thermal recovery is as follows:

[0025] A. When the solar radiation intensity and the heat storage amount of the heat storage device are sufficient, the combustion supplementing boiler is in a hot backup state, the high-temperature heat conducting medium at the outlet of the linearly concentrating solar collector field is mainly used to supply heat energy through the control of the valve f and the valve e, and the high-temperature steam is directly produced through the steam generator and the steam superheater, and the operation state of the combustion supplementing boiler and the steam production process are dynamically adjusted according to the real-time solar energy resource.

[0026] B. When the solar radiation intensity is low, the heat collecting amount of the solar energy is difficult to meet the heat load of steam production, the feedwater flow is sent into the combustion supplementing boiler for continuous heating after being heated in the steam generator by controlling the valve c and the valve d, and the water steam meeting the parameter requirement is produced.

[0027] C. When there is no solar radiation, the feedwater flow avoids the non-concentrating solar collector through the valve k, the heat conducting medium is heated in the heat storage / heat releasing heat exchanger by using the heat storage medium, the feedwater is heated to a certain degree in the steam generator together with the heat conducting medium, and then the feedwater enters the combustion supplementing boiler through the valve c and the valve d to absorb the heat of the high-temperature flue gas and produce water steam.

[0028] Beneficial effects: the solar steam production system for assisting heavy oil thermal recovery and the production process have the following beneficial effects:

[0029] 1. The clean and renewable solar energy is used to replace the traditional fossil fuel to produce water steam for thermal recovery, which meets the development trend of energy transformation, saves the fossil energy and reduces the pollutant emission.

[0030] 2. Through the optimized complementary cooperation of the non-concentrating / concentrating solar energy, the boiler and the heat storage, the discontinuous and unstable shortcomings of the solar energy are overcome, and the continuous and stable operation of the solar steam production system is realized.

[0031] 3. By heating low-temperature feedwater with a non-concentrating solar collector and then further heating it with single-axis tracking solar energy to produce steam, the system can make full use of the grade attributes of different heat sources, achieve "temperature matching and cascade utilization" of energy, reduce irreversible losses, and improve the overall energy utilization efficiency of the system. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a solar steam production system for assisting heavy oil thermal recovery disclosed in this invention;

[0033] in:

[0034] 1—Water softening device; 2—Non-concentrating solar collector

[0035] 3—Water supply pump 4—Steam generator

[0036] 5—Steam superheater; 6—High-temperature heat storage tank

[0037] 7—Low-temperature thermal storage tank; 8—Heat storage / release exchanger

[0038] 9—Heat-conducting working fluid circulation pump; 10—Linear concentrating solar thermal collector field

[0039] 11—Refueling Boiler 12—Steam Injection Device

[0040] 13—Crude oil processing unit; 14—Crude oil heating heat exchanger

[0041] 15—Crude oil gathering and transportation pump. Detailed Implementation

[0042] The specific embodiments of the present invention are described in detail below. Specific implementation examples:

[0044] like Figure 1 As shown, a solar steam production system for assisting heavy oil thermal recovery includes a solar thermal collector subsystem, a steam production subsystem, a thermal storage and combustion supplementary system, and an operation control subsystem. The steam production subsystem receives solar thermal energy collected by the solar thermal collector subsystem. Under the regulation of the operation control subsystem, the thermal storage and combustion supplementary system will be activated in a timely manner according to the changes in direct solar radiation.

[0045] The solar thermal collector subsystem includes a non-concentrating solar collector 2, a linear concentrating solar collector mirror field 10, and a heat transfer medium circulation pump 9. The non-concentrating solar collector 2 directly absorbs solar radiation to heat the feed water. The feed water preheated by the non-concentrating solar collector 2 then exchanges heat with the high-temperature heat transfer medium produced by the linear concentrating solar collector mirror field to produce steam.

[0046] Steam production subsystem: including water softening device 1, water pump 3, steam generator 4 and steam superheater 5, water flow after softening treatment through water softening device 1 into non-concentrating solar collector 2 preheating, and then directly into water pump 3, water pump 3 will be according to the injection of steam parameters demand to raise the water pressure, then through steam generator 4 and steam superheater 5 in turn, will fully absorb the heat of high temperature heat conducting medium provided by linear concentrating solar collector field 10, and finally the water flow is heated into high temperature water steam meeting the parameter requirements. In the process of steam production, the operation control system will optimize the heat transfer process of heat conducting medium according to the solar radiation and heat storage conditions, and control the water parameters through water pump 3 to ensure the steam production effect.

[0047] Heat storage and combustion supplement subsystem: including heat storage and release heat exchanger 8, high temperature heat storage tank 6, low temperature heat storage tank 7 and combustion supplement boiler 11. When the solar radiation is sufficient, the heat conducting medium heated by linear concentrating solar collector field 10 first meets the heat energy demand of water steam production, through control valves a and b, directly enters steam generator 4 and steam superheater 5 for heat exchange, the excess heat passes through high temperature heat storage tank 6, part of the heat conducting medium enters heat storage and release heat exchanger 8 through control valves a and b, the heat storage medium from low temperature heat storage tank 7 absorbs heat in it and then enters high temperature heat storage tank 6 to realize heat storage, and combustion supplement boiler 11 starts when the solar radiation intensity is insufficient or there is no solar radiation to ensure stable and reliable steam production.

[0048] Operation control subsystem: contains operation parameter sensing detection, calculation control unit and system operation adjustment execution action device, and can control valve a, valve b, valve c, valve d, valve e, valve f, valve g, valve h, valve i, valve k, heat conducting medium circulating pump 9, water pump 3 and crude oil gathering pump 15, and adjust the system operation mode according to the steam injection parameter demand of steam injection device 12 and the change of solar energy.

[0049] Further, in the solar heat collection subsystem, according to the solar radiation intensity, adjust valves i and h, when there is solar radiation, the water flow is preheated by non-concentrating solar collector 2 after preheating, then heated by the outlet heat conducting medium of linear concentrating solar collector field 10 with relatively high concentration to produce steam, so that the solar heat energy is utilized in stages and the irreversible loss is reduced.

[0050] Further, in the solar heat collection subsystem, according to the solar radiation intensity, adjust the operation parameters of heat conducting medium circulating pump 9 to control the flow velocity and outlet pressure of heat conducting medium in vacuum heat collecting tube, reduce the heat collecting loss and ensure the heat collecting effect.

[0051] Further, the heat-conducting medium can be selected from heat-conducting oil, low-melting-point molten salt, or water / steam directly used in a direct expansion mode.

[0052] Further, in the steam production subsystem, during the steam production process, the operation control subsystem optimizes the heat transfer process of the heat-conducting medium according to the solar radiation and heat storage conditions, and controls the feed water parameters through the feed water pump 3 to ensure the steam production effect.

[0053] Further, the heat storage combustion supplement subsystem is configured with a heat storage device.

[0054] During heat storage, the heat-conducting medium at the outlet of the linearly concentrated solar collector field 10 enters the heat storage / heat release heat exchanger 8 and transfers heat to the heat storage medium in the low-temperature heat storage tank 7. The heated heat storage medium enters the high-temperature heat storage tank 6 to store heat energy.

[0055] During heat release, the heat storage process is operated in reverse. The heat storage medium from the high-temperature heat storage tank 6 heats the heat-conducting medium in the heat storage / heat release heat exchanger 8. The heat-conducting medium circulates in the loop to produce water vapor.

[0056] Further, the heat storage medium can be selected from heat-conducting oil or molten salt. According to the differences between the heat-conducting medium and the heat storage medium, the system flow path circulation is adjusted appropriately.

[0057] Further, in the heat storage combustion supplement subsystem, when the solar radiation is sufficient, the feed water flow is fully preheated, and the combustion supplement boiler 11 is in a hot backup state. Through the control of the valve f and the valve e, the high-temperature heat-conducting medium at the outlet of the linearly concentrated solar collector field 10 is used to supply heat energy to the steam generator 4 and the steam superheater 5 to produce high-temperature steam.

[0058] Further, the heat storage combustion supplement subsystem is configured with the combustion supplement boiler 11 as a system operation guarantee device. The fuel that can be used includes natural gas, diesel, and coal. It can also be adjusted to an electrically driven boiler according to the actual needs of the territory.

[0059] A solar steam production system for assisting thick oil thermal recovery, characterized in that the control of the flow rate and outlet pressure of the heat-conducting medium in the evacuated collector tube is as follows:

[0060] A, when the solar radiation is sufficient, the feed water flow is fully preheated, and the combustion supplement boiler 11 is in a hot backup state. Through the control of the valve f and the valve e, the preheated feed water directly produces high-temperature steam through the steam generator 4 and the steam superheater 5, fully utilizes the high-temperature heat energy generated by the linearly concentrated solar collector field 10, and according to the temperature and flow rate of the heat-conducting medium at the outlet of the linearly concentrated solar collector field 10, combines the steam parameters of the thermal recovery and the feed water temperature at the outlet of the non-concentrating solar collector 2 to obtain the required flow rate of the heat-conducting medium for heating the feed water flow, and controls the flow rate of the feed water flow through the feed water pump 3.

[0061] B. When the solar radiation intensity is low, it is difficult for the solar heat collection to meet the steam production. The heat-conducting medium continues to heat the feedwater flow in the steam generator 4, and then continues to heat in the supplementary combustion boiler 11. According to the outlet temperature and flow of the heat-conducting medium of the linear concentrating solar collector field 10, combined with the steam parameters and the outlet feedwater temperature of the non-concentrating solar collector 2, the flow of the heat-conducting medium heating the feedwater flow is obtained. The feedwater flow is heated by the heat-conducting medium in the steam generator 4, and then enters the supplementary combustion boiler 11 through valves c and d. The supplementary combustion boiler 11 controls the supply of fuel and air according to the steam parameters and the feedwater flow parameters at the outlet of the steam generator 4, to produce high-temperature steam that meets the requirements of the steam injection parameters.

[0062] C. When there is no solar radiation, the linear concentrating solar collector field 10 stops working. The flow of the feedwater flow is determined according to the heat storage capacity and the steam injection demand. The feedwater flow does not need to be preheated and avoids the non-concentrating solar collector 2 through valve k. In the heat storage / heat release heat exchanger 8, the heat storage medium is used to heat the heat-conducting medium. The feedwater and the heat-conducting medium exchange heat in the steam generator 4 to raise the temperature of the feedwater to a certain extent. Then the feedwater enters the supplementary combustion boiler 11 through valves c and d to absorb the heat of the high-temperature flue gas, avoiding the large temperature difference in heat exchange when the supplementary combustion boiler 11 directly heats the low-temperature feedwater flow, which causes a loss of heating capacity of the supplementary combustion boiler 11.

[0063] According to the oil well parameters and geological conditions, the best steam injection parameters are obtained. By controlling the flow and pressure of the feedwater pump 3, the steam parameters produced are controlled, and the valve assembly is adjusted in combination with the operation control subsystem to optimize the matching of solar energy and the heat energy of the supplementary combustion boiler 11, and to produce steam that meets the requirements of the steam injection parameters.

[0064] The feedwater flow heated by the non-concentrating solar collector 2 can be used to heat crude oil to ensure the normal collection and transportation of crude oil, and can also be used for hot water for daily use in oil production fields.

[0065] In summary:

[0066] Using clean and renewable solar energy to replace traditional fossil fuels to produce steam for steam injection meets the development trend of energy transformation, and at the same time achieves the purpose of saving fossil energy and reducing pollutant emissions.

[0067] Through the optimized complementary cooperation of non-concentrating / concentrating solar energy, boilers and heat storage, the discontinuous and unstable shortcomings of solar energy are overcome, and continuous and stable operation of the solar steam production system can be realized.

[0068] The method of heating low-temperature feedwater by the non-concentrating solar collector 2 and further heating to produce steam by the single-axis tracking solar energy fully utilizes the grade attributes of different heat sources, realizes the "temperature matching and cascade utilization" of energy, reduces the irreversible loss, and improves the overall energy utilization efficiency of the system.

[0069] The embodiments of the present application are described above in detail. However, the present application is not limited to the above embodiments but various changes which can be conceived by those having ordinary knowledge in the art to which the present application pertains can be made without departing from the scope of the present application.

Claims

1. A solar steam production system for assisting heavy oil thermal recovery, characterized in that, The system comprises a solar heat collection subsystem, a steam production subsystem, a heat storage and combustion supplement subsystem and an operation control subsystem, the steam production subsystem receives solar heat energy collected by the solar heat collection subsystem, and the heat storage and combustion supplement subsystem will be started in time under the regulation of the operation control subsystem with the change of direct solar radiation; The solar heat collection subsystem comprises a non-concentrating solar heat collector (2), a linear concentrating solar heat collector field (10) and a heat conducting medium circulating pump (9), wherein the non-concentrating solar heat collector (2) uses absorbed solar energy to heat softened feed water flow, and then produces high-temperature heat conducting medium by the linear concentrating solar heat collector field, and the feed water flow produces qualified steam after high-temperature heat exchange; The steam production subsystem comprises a feed water softening device (1), a feed water pump (3), a steam generator (4) and a steam superheater (5), the softened water is preheated by the non-concentrating solar heat collector (2), the feed water pump (3) increases the feed water pressure according to the injection and extraction steam parameter demand, and then passes through the steam generator (4) and the steam superheater (5); The heat storage and combustion supplement subsystem comprises a heat storage and release heat exchanger (8), a high-temperature heat storage tank (6), a low-temperature heat storage tank (7) and a combustion supplement boiler (11), according to the heat load of the steam generator (4) and the steam superheater (5) and the real-time solar energy resource, part of the high-temperature heat conducting medium heated by the linear concentrating solar heat collector field (10) is stored by heat exchange with the heat conducting medium in the high-temperature heat storage tank (6) and the low-temperature heat storage tank (7), and is also released and utilized according to real-time demand; The operation control subsystem comprises operation parameter sensing detection, calculation control unit and system operation regulation execution action device, and can control valve a, valve b, valve c, valve d, valve e, valve f, valve g, valve h, valve i, valve k, the heat conducting medium circulating pump (9), the feed water pump (3) and the crude oil gathering and transportation pump (15); In the solar heat collection subsystem, valve i and valve h are adjusted according to the solar radiation intensity, when there is solar radiation, the feed water flow is preheated by the non-concentrating solar heat collector (2) after entering the feed water pump (3), the feed water flow is preheated by the non-concentrating solar heat collector (2) with lower heat collection temperature, and then the outlet heat conducting medium of the linear concentrating solar heat collector field (10) with higher concentration is used to produce steam, so that the solar heat energy is used in stages and the irreversible loss is reduced; In the solar heat collection subsystem, the operation parameters of the heat conducting medium circulating pump (9) are adjusted according to the solar radiation intensity to control the flow rate and outlet pressure of the heat conducting medium in the vacuum heat collecting tube, reduce the heat collection loss and ensure the heat collection effect; The heat conducting medium is heat conducting oil or low-melting-point molten salt; In the steam production subsystem, the operation control subsystem optimizes the heat transfer process of the heat conducting medium according to the solar radiation and heat storage conditions during the steam production process, and controls the feed water parameters by the feed water pump (3) to ensure the steam production effect; The heat storage and combustion supplement subsystem is provided with a heat storage device When storing heat: the heat-conducting medium at the outlet of the linearly concentrating solar collector field (10) enters the heat storage and release heat exchanger (8) and transfers heat to the heat storage medium in the low-temperature heat storage tank (7), and the heated heat storage medium is stored in the high-temperature heat storage tank (6) to store heat energy; When releasing heat: the heat storage process is reversed, the heat storage medium from the high-temperature heat storage tank (6) heats the heat-conducting medium in the heat storage and release heat exchanger (8), and the heat-conducting medium circulates in the loop to produce steam; The heat storage medium is heat-conducting oil or molten salt, and the system flow pipeline circulation is adjusted moderately according to the difference between the heat-conducting medium and the heat storage medium; In the heat storage and supplementary combustion subsystem, when the solar radiation is sufficient, the feedwater flow is fully preheated, and the supplementary combustion boiler (11) is in a hot backup state. In the heat storage and supplementary combustion subsystem, by controlling valves f and e, the high-temperature heat-conducting medium at the outlet of the linearly concentrating solar collector field (10) is used to supply heat energy to the steam generator (4) and the steam superheater (5) to produce high-temperature steam. The heat storage and supplementary combustion subsystem occupies the supplementary combustion boiler (11) configured as a system operation guarantee device, and the fuel that can be combusted includes natural gas, diesel and coal. The supplementary combustion boiler (11) can use natural gas, diesel and coal as fuel.

2. The solar steam production system for assisting heavy oil thermal recovery according to claim 1, characterized in that, The control of the flow rate and outlet pressure of the heat-conducting medium in the evacuated collector tube is as follows: A. When the solar radiation intensity and the heat storage amount of the heat storage device are sufficient, the supplementary combustion boiler (11) is in a hot backup state, valves f and e are controlled, and mainly the high-temperature heat-conducting medium at the outlet of the linearly concentrating solar collector field (10) is used to provide heat energy, and high-temperature steam is directly produced through the steam generator (4) and the steam superheater (5), and the operation state of the supplementary combustion boiler (11) and the steam production process will be dynamically adjusted according to the real-time solar resource situation; B. When the solar radiation intensity is low, the solar heat collection amount is difficult to meet the steam production heat load, the heat-conducting medium heats the feedwater flow in the steam generator (4), and then valves c and d are controlled to send the feedwater into the supplementary combustion boiler (11) for further heating to produce water vapor that meets the parameter requirements; C. When there is no solar radiation, the feedwater flow avoids the non-concentrating solar collector (2) through valve k, heats the heat-conducting medium in the heat storage and release heat exchanger (8) using the heat storage medium, and then the feedwater and the heat-conducting medium are heated in the steam generator (4) to raise the temperature of the feedwater to a certain extent, and then the feedwater enters the supplementary combustion boiler (11) through valves c and d to absorb the heat of the high-temperature flue gas to produce water vapor.

3. The solar steam production system for assisting heavy oil thermal recovery according to claim 1, characterized in that, In the heat storage and supplementary combustion subsystem, the supplementary combustion boiler (11) is started when the solar radiation intensity is insufficient or there is no solar radiation to ensure stable and reliable steam production.

4. The solar steam production system for assisting heavy oil thermal recovery according to claim 1, characterized in that, In the operation control subsystem, the system operation mode is adjusted according to the injection parameter requirements of the injection device (12) and the change of solar energy.

5. The solar steam production system for assisting heavy oil thermal recovery according to claim 1, characterized in that, In the steam production subsystem, the feedwater fully absorbs the heat of the high-temperature heat-conducting medium provided by the linearly concentrating solar collector field (10) to heat the feedwater into high-temperature water vapor that meets the thermal recovery parameter requirements.

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