Oil field heat supply system and control method

Abstract

The invention discloses an oil field heat supply system and a control method, relates to the technical field of thermal engineering, and discloses the oil field heat supply system which comprises a heat supply module and a heat storage module. And the heat supply module is connected with the heat storage module and external heat utilization equipment. And the heat storage module is also connected with external heat utilization equipment. The heat supply module is used for supplying heat to external heat utilization equipment and the heat storage module; when the heat supply load of the heat supply module is insufficient, the heat storage module is used for supplementing; when the heat supply load of the heat supply module is excessive, heat is stored in the heat storage module, so that heat resources are saved; when the heat supply module does not need heat supply, the economic cost is saved through valley electricity heat storage; due to the introduction of the heat storage module in the oil field heat supply system, the flexibility and economical efficiency of the heat supply system are greatly improved, the application scene is wider, and the energy utilization rate is increased.

Description

Technical Field

[0001] This application relates to the field of thermal engineering technology, and in particular to an oilfield heating system and control method. Background Technology

[0002] With the gradual increase in installed capacity of new energy sources, the energy structure is beginning to develop towards green, low-carbon, and efficient directions. However, during the winter heating season, combined heat and power (CHP) units are limited by the "heat-driven power generation" operating mode, which makes it impossible to achieve deep peak shaving targets under certain heat loads, resulting in increased wind and solar curtailment rates. Meanwhile, the large-scale grid connection of new energy sources brings significant grid load fluctuations, and CHP units need to prioritize ensuring heating loads. Compared to pure condensing operation, the unit's ability to regulate electrical load is greatly reduced, and its operational flexibility is decreased. During the non-heating season, the unit maintains a single mode of pure condensing operation, which also reduces the unit's operating economy. Summary of the Invention

[0003] The main objective of this application is to provide an oilfield heating system and control method, which aims to solve the technical problems of poor flexibility and economy in existing oilfield heating systems.

[0004] To achieve the above objectives, this application proposes an oilfield heating system, comprising: a heating module and a heat storage module; the heat storage module is further connected to external heat-using equipment; the heating module is connected to the heat storage module and the external heat-using equipment; the heating module is used to output heat energy to the external heat-using equipment, and is also used to output surplus heat energy to the heat storage module when the heating load is excessive; the heat storage module is used to store the surplus heat energy of the heating module; the heat storage module is also used to output heat energy to the external heat-using equipment when the heating load of the heating module is insufficient; the heat storage module is also used to utilize off-peak electricity for heat storage when the heating module stops supplying heat.

[0005] In one embodiment, the system further includes: a cascade heat utilization module; the heat storage module is also connected to the cascade heat utilization module; the heat storage module is also used to output heat energy to the cascade heat utilization module; the cascade heat utilization module is used to convert the heat energy into energy of different gradients for heating after receiving the heat energy transmitted by the heat storage module.

[0006] In one embodiment, the heating module includes: a combined heat and power (CHP) unit; the CHP unit is connected to the thermal storage module and external heat-consuming equipment; the CHP unit is used to output heat energy to the external heat-consuming equipment, and also to output hot steam to the thermal storage module when the heating load is excessive.

[0007] In one embodiment, the heat storage module includes: a steam accumulator, a screw compressor, and a heater; the steam accumulator is connected to the screw compressor and the cascade heat-using module respectively; the heater is connected to the cogeneration unit and the screw compressor respectively; the steam accumulator is used to receive hot steam and generate saturated water for energy storage through condensation and heat release; the steam accumulator is also used to flash the saturated water to generate hot steam for heating external heat-using equipment when the heating load is insufficient; the heater is used to heat the gas from the cogeneration unit using off-peak electricity when the cogeneration unit stops supplying heat, and output the heated gas to the screw compressor; the screw compressor is used to compress the heated gas into saturated steam for heat storage using off-peak electricity; the steam accumulator is also used to output hot steam for heating the cascade heat-using module.

[0008] In one embodiment, the thermal storage module further includes: a water tank, an energy storage water supply pump, and a regenerative water supply pump; the water tank is connected to the steam accumulator via the energy storage water supply pump; the water tank is also connected to the cogeneration unit via the regenerative water supply pump; the water tank is used to store equipment water and to supply equipment water to the steam accumulator and the cogeneration unit.

[0009] In one embodiment, the cascade heat module includes: a screw expander; the screw expander is connected to the steam accumulator; the screw expander is used to generate electricity by expanding the steam after receiving the hot steam output from the steam accumulator, and to provide heat through the exhaust gas generated by the expansion power generation.

[0010] Furthermore, to achieve the above objectives, this application also proposes a control method. This method applies to the oilfield heating system described above. The method includes: acquiring the operating condition information of the heating module; determining, based on the operating condition information, whether the heating load of the heating module meets the heating demand of external heating equipment; when the heating load meets the heating demand of the external heating equipment, controlling the thermal storage module to store excess thermal energy; when the heating load does not meet the heating demand of the external heating equipment, controlling the thermal storage module to replenish thermal energy; and when the heating module stops supplying heat, controlling the thermal storage module to utilize off-peak electricity for heat storage.

[0011] In one embodiment, after the step of controlling the thermal storage module to utilize off-peak electricity for heat storage when the heating module stops supplying heat, the method further includes: when the heating load meets the heating demand of external heating equipment or the heating module stops supplying heat, controlling the thermal storage module to output heat energy to the cascade heating module; and controlling the cascade heating module to convert the heat energy into energy of different gradients for heating.

[0012] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and which, when executed by a processor, implements the steps of the control method described above.

[0013] In addition, to achieve the above objectives, this application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the control method described above.

[0014] One or more technical solutions proposed in this application have at least the following technical effects:

[0015] The heating system provides heat to external heating equipment and thermal storage modules via heating modules; when the heating load of the heating modules is insufficient, the thermal storage modules supplement it; when the heating load of the heating modules is excessive, the heat is stored in the thermal storage modules to save thermal resources; when the heating modules do not need to provide heat, off-peak electricity is used to save economic costs. The introduction of thermal storage modules has greatly improved the flexibility and economy of the heating system, broadened its application scenarios, and improved energy utilization. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural block diagram provided for Embodiment 1 of the oilfield heating system of this application;

[0019] Figure 2 This is a system diagram provided for Embodiment 1 of the oilfield heating system of this application;

[0020] Figure 3 This is an equipment connection diagram of the heat storage module provided in Embodiment 1 of the oilfield heating system of this application;

[0021] Figure 4 This is an equipment connection diagram of the cascade heat-using module provided in Embodiment 1 of the oilfield heating system of this application;

[0022] Figure 5 This is a flowchart illustrating the second embodiment of the control method of this application.

[0023] In this application, 10 is a heating module; 20 is a thermal storage module; and 30 is a cascade heat utilization module.

[0024] Specifically, 2A is the energy storage shut-off valve; 2B is the water spray desuperheating valve; 2C is the steam accumulator; 2D is the drain shut-off valve; 2E is the heat release main steam valve; 2F is the heat release electric regulating valve; 2G is the second heat exchanger; 2H is the water treatment device; 2I is the water tank; 2J is the regenerative water supply pump; 2K is the regenerative shut-off valve; 2L is the energy storage water supply pump; 2M is the water supply shut-off valve; 2N is the exhaust steam shut-off valve; 2O is the heater; 2P is the electric motor; 2Q is the screw compressor; 2R is the compressor exhaust shut-off valve; and 2S is the compressor exhaust electric regulating valve.

[0025] In addition, 3A is the electric regulating valve for the inlet steam of the screw expander; 3B is the screw expander; 3C is the generator; and 3D is the third heat exchanger.

[0026] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0027] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0028] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0029] Currently, my country's combined heat and power (CHP) units follow the principle of "replacing small units with large ones," primarily with capacities of 200, 600, and 1000 MW. The heating steam for these units mostly utilizes extraction steam from the connecting pipes of the medium and low-pressure cylinders. Flexible retrofit technologies for CHP units in oilfields mainly include unit-side modifications such as near-zero output modification of the low-pressure cylinder, low-pressure cylinder shaft operation, and turbine bypass; and unit-side modifications involving the addition of auxiliary heating equipment such as electric boilers, heat pumps, and thermal storage tanks. For CHP unit heating retrofit technologies, waste heat utilization is similar to high back pressure retrofit and coupled heat pump retrofit technologies, while waste pressure utilization mainly relies on heating steam combined with waste pressure turbine technology.

[0030] The aforementioned technologies, which employ variable-pressure steam accumulators with stronger heat storage capacity for phase change heat storage and screw expanders with stronger adaptability to medium and low temperature working fluids for the cascade utilization of heating steam, have not been widely applied. At the same time, most of the flexibility modification technologies are only applicable to areas with long heating seasons. During the non-heating season, the units maintain pure condensing operation, and the added flexibility modification equipment is basically shut down. This results in limited unit operation flexibility and poor operating economy.

[0031] Therefore, in order to solve the technical problems of poor flexibility and economy in existing oilfield heating systems, this embodiment proposes an oilfield heating system. Please refer to... Figure 1 , Figure 1 This is a structural block diagram provided for Embodiment 1 of the oilfield heating system of this application.

[0032] In this embodiment, the oilfield heating system includes a heating module 10 and a thermal storage module 20. The two modules cooperate to ensure efficient utilization of thermal energy and stable heating for external heating equipment. The heating module 10 connects the thermal storage module 20 to the external heating equipment; the thermal storage module 20 is also connected to the external heating equipment.

[0033] It should be noted that the heating module 10 is used to output heat energy to external heat-using equipment, and also to output excess heat energy to the heat storage module when the heating load is excessive. It can be understood that the heating module 10 is the heat energy provider for the entire system. Its main responsibility is to output heat energy to external heat-using equipment to meet its heating needs.

[0034] Furthermore, when the heat generated by the heating module 10 exceeds the actual demand of external heating equipment, i.e., when the heating load is excessive, it can also transfer this excess heat to the heat storage module 20 for storage. This design avoids the waste of heat energy and improves the overall efficiency of the system.

[0035] It should be noted that the heat storage module 20 is used to store the remaining heat energy of the heating module; the heat storage module 20 is also used to output heat energy to external heat-using equipment when the heating load of the heating module 10 is insufficient; the heat storage module 20 is also used to utilize off-peak electricity for heat storage when the heating module 10 stops supplying heat.

[0036] Understandably, the thermal storage module 20 plays the role of thermal energy storage and regulation. It is responsible for receiving and storing excess thermal energy from the heating module 10. When the heating load of the heating module 10 is insufficient to meet the heating needs of external heating equipment, the thermal storage module 20 will output the stored thermal energy to supplement the deficiency of the heating module 10. In this way, even if the heating capacity of the heating module 10 fluctuates, the heating of the external heating equipment can remain stable.

[0037] Understandably, off-peak electricity typically refers to electricity generated during periods of lower electricity prices. Utilizing this time for heat storage can reduce system operating costs. Simultaneously, this provides the heating module 10 with additional thermal energy reserves when needed, enhancing the system's flexibility and reliability.

[0038] In one feasible implementation, the oilfield heating system further includes: a cascade heat consumption module 30; the heat storage module 20 is also connected to the cascade heat consumption module 30; the heat storage module 20 is also used to output heat energy to the cascade heat consumption module 30; the cascade heat consumption module 30 is used to convert the heat energy transmitted by the heat storage module 20 into energy of different gradients for heating.

[0039] Understandably, the cascaded heating module 30 can convert heat energy into heat energy output at different temperatures or in different forms according to different heat demand. This cascaded utilization of heat energy can greatly improve the utilization rate of heat energy and reduce energy waste.

[0040] In practical applications, the cascade heating module 30 may contain multiple heat energy conversion units, each of which can convert heat energy into energy of a specific gradient. In this way, the system can select the most suitable heat energy gradient for heating according to the specific needs of the external heating equipment.

[0041] In this embodiment, the efficient utilization and stable output of thermal energy are achieved through the coordinated operation of the heating module 10 and the thermal storage module 20. Whether it's thermal energy storage during periods of excess heating load, thermal energy supplementation during periods of insufficient heating load, or even utilizing off-peak electricity for thermal storage to reduce operating costs, all are included within the management scope, offering high flexibility and efficiency. Simultaneously, the introduction of the cascaded heat utilization module 30 makes the oilfield heating system more precise and efficient in its thermal energy utilization, further improving the system's flexibility and reliability.

[0042] Specifically, please refer to Figure 2 , Figure 2 This is a system diagram provided for an embodiment of the oilfield heating system of this application. Under the premise of the above-described implementation, when considering an oilfield scenario, the heating module 10 is typically selected as a combined heat and power unit.

[0043] As is understandable, a combined heat and power (CHP) unit is a process that simultaneously produces electricity and heat. Power plants use the steam generated by turbine generators to supply heat to users while simultaneously producing electricity. This method is more fuel-efficient than producing electricity and heat separately. Due to their high efficiency and environmental friendliness, CHP units are widely used in oilfield power plants.

[0044] Understandably, combined heat and power (CHP) units generate high-temperature, high-pressure steam by burning fossil fuels (such as natural gas, coal, or associated gas from oil fields). Part of this steam is used to drive a steam turbine, which in turn drives a generator to produce electricity; the other part is used to provide heat energy to external heat-consuming equipment through heat exchangers or direct pipeline transmission.

[0045] Therefore, although cogeneration units are limited to the "heat-driven power generation" operation mode, they are better adapted to the oilfield heating system described in this application.

[0046] It should be noted that the combined heat and power (CHP) unit connects the thermal storage module 20 and the external heat-consuming equipment. The CHP unit is used to output heat energy to the external heat-consuming equipment and also to output hot steam to the thermal storage module 20 when there is excess heating load. When the external heat-consuming equipment requires more heat energy, or when the CHP unit shuts down for any reason, the thermal storage module 20 can release the stored heat energy to meet the heating demand.

[0047] Further, please refer to Figure 3 , Figure 3 This is an equipment connection diagram for the thermal storage module provided in Embodiment 1 of the oilfield heating system of this application. This embodiment shows the specific selection and connection relationship of the thermal storage module 20.

[0048] In this embodiment, the heat storage module mainly includes: a steam accumulator 2C, a screw compressor 2Q, and a heater 2O.

[0049] The steam accumulator 2C is connected to both the screw compressor 2Q and the cascade heat module 30; the heater 2O is connected to both the cogeneration unit and the screw compressor 2Q. Each of these connections is equipped with corresponding valves for easy mechanical control and manual management.

[0050] It should be noted that the steam accumulator 2C is one of the core components of the entire system. It has two main functions: First, upon receiving hot steam, the steam accumulator utilizes the condensation and heat release process of the steam to generate saturated water, thereby storing thermal energy. This function enables the system to effectively store energy when thermal energy is abundant. Second, when the heating load is insufficient, the steam accumulator can flash-evaporate the stored saturated water to generate hot steam for use by external heat-consuming equipment. This function ensures that the system can provide a stable supply of thermal energy during peak demand periods.

[0051] It should be noted that heater 2O is mainly used to supplement the heat energy when the cogeneration unit stops supplying heat. It uses off-peak electricity to heat the gas released from the cogeneration unit and outputs the heated gas to screw compressor 2Q. This process not only realizes the reuse of heat energy, but also reduces operating costs by utilizing off-peak electricity.

[0052] It should be noted that the screw compressor 2Q plays the role of compressing the heated gas into saturated steam in the system. During this process, the screw compressor uses off-peak electricity as a power source to compress the gas into a saturated steam state for further storage in the steam accumulator 2C. In this way, the system can achieve continuous storage and supply of thermal energy through the coordinated operation of the heater 2O and the screw compressor 2Q when the cogeneration unit stops supplying heat.

[0053] In addition, the steam accumulator 2C also has the function of outputting hot steam to the cascade heat utilization modules. By outputting hot steam to the cascade heat utilization modules, the steam accumulator 2C can further improve the efficiency of thermal energy utilization and achieve maximum utilization of thermal energy.

[0054] Furthermore, in order to ensure the water-vapor balance of the oilfield heating system, the heat storage module also includes: a water tank 2I, an energy storage water supply pump 2L, and an energy storage water supply pump 2J; the water tank 2I is connected to the steam accumulator 2C through the energy storage water supply pump 2L.

[0055] Understandably, as the water storage device in the entire thermal storage module, the main function of water tank 2I is to store sufficient water for the equipment to meet the water demand that may arise during the operation of steam accumulator 2C and the cogeneration unit. Through reasonable water storage design, water tank 2I can ensure a stable water supply for the system under various operating conditions, thereby avoiding system shutdown or efficiency reduction due to water shortage.

[0056] It should be noted that the energy storage water supply pumps 2L and 2J are responsible for replenishing the water supply to the steam accumulator 2C and the combined heat and power unit, respectively. These two pumps, through precise control and adjustment, can perform timely water replenishment operations based on the actual water demand of the equipment. This design not only helps maintain a stable water level inside the equipment but also effectively prevents equipment damage or performance degradation due to excessively low water levels.

[0057] In the specific workflow, when the water level in the steam accumulator 2C or the combined heat and power unit falls below the set value, the corresponding energy storage water supply pump 2L or 2J will automatically start, drawing an appropriate amount of water from the water tank 2I to replenish it. The water replenishment process is ensured to be accurate and stable through precise flow control and pressure monitoring. Simultaneously, to avoid waste and contamination during the water replenishment process, the system is also equipped with appropriate valves and filters to ensure that the replenished water quality meets the equipment requirements.

[0058] Based on the above, please refer to Figure 4 , Figure 4 This is a diagram showing the equipment connection of the cascade heat supply module provided in Embodiment 1 of the oilfield heating system of this application.

[0059] In this embodiment, the cascade heat supply module includes: a screw expander 3A; the screw expander is connected to the steam accumulator 2C; the screw expander 3A is used to expand and generate electricity after receiving hot steam output from the steam accumulator 2C, and to supply heat through the exhaust gas generated by the expansion and power generation, thereby realizing energy heating at different gradients.

[0060] It should be noted that the screw expander 3A operates based on thermodynamic principles. When it receives high-temperature, high-pressure steam from the steam accumulator 2C, the steam expands inside the screw expander, driving the screw to rotate and generating electrical energy. In this process, the internal energy of the steam is effectively converted into mechanical energy, and ultimately into electrical energy output. Simultaneously, the expanded steam's temperature and pressure decrease, but it still retains some thermal energy, which can be further utilized for heating.

[0061] Understandably, the thermal energy stored in the steam accumulator 2C is released to drive the screw expander 3A to generate electricity, achieving efficient conversion of high-grade energy. Subsequently, the expanded steam can still be used as a low-grade heat source to meet other heating needs in the oilfield, such as heating crude oil and maintaining equipment temperature. This cascaded heat utilization method not only improves energy utilization efficiency but also reduces energy waste, achieving a dual improvement in economic and environmental benefits.

[0062] Furthermore, combined Figure 2 , Figure 3 and Figure 4 In addition to the main equipment mentioned above, the heating module 10 of this application should also include a first heat exchanger for realizing heat exchange.

[0063] It should be noted that the thermal storage module 20 also includes: energy storage shut-off valve 2A, water spray desuperheating valve 2B, drainage shut-off valve 2D, heat release main steam valve 2E; heat release electric regulating valve 2F, second heat exchanger 2G, water treatment device 2H, regenerative shut-off valve 2K, water supply shut-off valve 2M; exhaust steam shut-off valve 2N, electric motor 2P, compressor exhaust shut-off valve 2R, and compressor exhaust electric regulating valve 2S.

[0064] The valves mentioned above facilitate system control; the second heat exchanger 2G is used for heat exchange between the heat storage module and other equipment; the water treatment device 2H is used to treat the water quality inside the heat storage module, including removing impurities and adjusting the pH value of the water, to ensure the stability and safety of the water quality inside the system; the electric motor 2P serves as the power source in the heat storage module, and is used to drive various pumps, compressors and other equipment to ensure that the heat storage module can operate efficiently and stably.

[0065] In addition, the cascade heat module of this application also includes a screw expander inlet electric regulating valve 3A, a generator 3C, and a third heat exchanger 3D, which will not be described in detail here.

[0066] In summary, considering the non-deep peak shaving phase, deep peak shaving phase, and non-heating season phase faced by cogeneration units, this application presents the workflow of the oilfield heating system described herein.

[0067] During periods of non-deep peak shaving, the steam accumulator 2C needs to be replenished with a certain amount of soft water before energy storage. The municipal water supply is treated by the water treatment device 2H to become soft water that meets the unit's water supply standards. The treated soft water is then transported to the water tank 2I for storage. The water tank 2I can be an insulated softened condensate tank. When replenishing water to the steam accumulator 2C, the drain shut-off valve 2D is fully closed, the energy storage water replenishment pump 2L is turned on, and after the pressure meets the pressure in the water replenishment pipeline to the steam accumulator 2C, the water replenishment shut-off valve 2M is opened to transport the treated soft water to the steam accumulator 2C through the water tank 2I. After the water replenishment level is reached, the water replenishment shut-off valve 2M is closed.

[0068] During energy storage in steam accumulator 2C, the cogeneration unit increases its operating conditions while maintaining a constant electrical load, resulting in an increase in the corresponding extraction of steam for heating. The heat release shut-off valve 2E and the drain shut-off valve 2D are closed, while the energy storage shut-off valve 2A is opened to extract the increased heating steam. During this process, the regenerative shut-off valve 2K and the regenerative makeup water pump 2J also need to be opened to ensure the steam-water balance of the cogeneration unit. The heating steam, after being cooled to saturated steam at the energy storage pressure of steam accumulator 2C by the spray desuperheating valve 2B, enters steam accumulator 2C. The saturated steam mixes with water through nozzles within steam accumulator 2C and exchanges heat, forming saturated water through condensation and heat release. When the pressure of the saturated water in steam accumulator 2C rises to the energy storage pressure, the energy storage shut-off valve 2A and the spray desuperheating valve 2B are closed, at which point the energy storage in steam accumulator 2C is complete.

[0069] During periods of deep peak shaving, the steam accumulator 2C is used as a separate heating unit. Before heat release, the stored energy load should meet the heat supply requirements during peak shaving. After closing the heat storage shut-off valve, the water spray desuperheating valve 2B, and the drain shut-off valve 2D, the heat release main steam valve 2E and the heat release electric regulating valve 2G are opened. The saturated water in the steam accumulator 2C flashes to form saturated steam under heat release pressure after the valve is opened. It enters the second heat exchanger 2G to exchange heat with the heat users and finally returns to the water tank 2I. During this process, the external required heat and electricity load is outside the heat and electricity feasible region. The steam accumulator releases heat to the outside to supplement the insufficient heat load. The cogeneration unit reduces the electrical load by extracting less heating steam, thus achieving the goal of deep peak shaving.

[0070] If energy storage is required during deep peak shaving, the unit must operate at the boiler's minimum stable combustion load to ensure a constant external heating load. The steam accumulator 2C extracts and stores more heating steam, thus increasing the unit's total heating steam extraction and reducing its work capacity and electrical load. It is important to note that the heat storage capacity of the steam accumulator 2C is always less than the unit's maximum heating load under this operating condition.

[0071] During non-peak hours in the daytime, before the cascade heat module 30 generates electricity by releasing heat, all equipment except for the steam accumulator 2C, the main steam valve 2E, and the water tank 2I are shut down. After the steam accumulator 2C releases heat, the electric regulating valve 3A of the screw expander is opened. The saturated steam enters the screw expander 3B and expands to do work, driving the generator 3C to generate electricity. The exhaust steam of the expander enters the third heat exchanger 3D to exchange heat with the heat users and then returns to the water tank 2I. This process makes full use of the energy of the steam supplied by the steam accumulator 2C, realizes combined heat and power, and improves the energy cascade utilization rate.

[0072] During the non-heating season, the unit operates under pure condensing mode. At night, the thermal storage module 20 uses off-peak electricity storage and daytime peak electricity release for heat generation from the cascade heat consumption module 30, operating in conjunction with each other. The energy storage shut-off valve 2A, the water spray desuperheating valve 2B, the heat release electric regulating valve 2F, and the second heat exchanger 2G in the thermal storage module 20 are all closed and stopped.

[0073] During off-peak electricity hours at night, the main steam release valve 2E is closed, and the exhaust steam shut-off valve 2N is opened. While extracting exhaust steam, water must be simultaneously added to the unit's regenerative heating system; the water addition operation will not be detailed here. The unit's exhaust steam is in a wet steam state and needs to be heated using off-peak electricity via the electric heater 2O. After heating, the exhaust steam enters the screw compressor 2Q and is compressed to saturated steam. During this process, the screw compressor 2Q is powered by the electric motor 2P using off-peak electricity. The compressed steam passes through the compressor exhaust shut-off valve 2R and the compressor exhaust electric regulating valve 2S before entering the steam accumulator 2C. The water addition operation during this process will not be detailed here. At this point, the energy storage module 20's operation using off-peak electricity for energy storage is complete. The total power consumption in this operating mode is the total power consumption of the electric heater and electric motor during off-peak electricity hours.

[0074] During peak daytime electricity hours, all equipment in the thermal storage module 20, except for the steam accumulator 2C, the main steam valve 2E, and the insulated softened condensate tank 2I, is shut down. The operation of the saturated steam released by the steam accumulator 2C entering the cascade heat utilization module 30 is not described in detail. During heat exchange, the heat user in the heat exchanger 3D can be either the external environment or the unit itself. In this operating mode, the revenue generated by the screw expander 3B is obtained by releasing the energy stored during off-peak hours. Therefore, the net revenue from peak daytime electricity and off-peak nighttime electricity within the same day is considered as the total revenue of the unit during the non-heating season, realizing the cascade utilization of energy from the steam accumulator 2C and improving the operational flexibility and economy of unit 1.

[0075] In this embodiment, a heating module supplies heat to external heat-consuming equipment and a heat storage module. When the heating module's heating load is insufficient, the heat storage module supplements it. When the heating module's heating load is excessive, the heat is stored in the heat storage module, achieving energy conservation. When the heating module does not need to supply heat, off-peak electricity is used for heat storage to save economic costs. In addition, the cascade heat-consuming module also converts high-grade heat energy into energy of different gradients, solving the problem of high supply and low utilization. The introduction of the heat storage module and the cascade heat-consuming module greatly improves the flexibility and economy of the heating system, broadens its application scenarios, and improves energy utilization.

[0076] In addition, this application also proposes a control method, please refer to... Figure 5 , Figure 5 This is a flowchart illustrating a second embodiment of the control method of this application. In this embodiment, the method is applied to the oilfield heating system described above. The control method proposed in this application is an intelligent management strategy for oilfield heating systems. This method acquires the operating condition information of the heating module in real time and dynamically adjusts the operating status of the thermal storage module based on this information to ensure that the heating demand of external heating equipment is met, while achieving efficient energy utilization.

[0077] In this embodiment, the control method includes steps S10 to S50.

[0078] Step S10: Obtain the operating status information of the heating module.

[0079] It is understood that the operating condition information of the heating module can be collected in real time through sensors or other monitoring devices. This operating condition information includes, but is not limited to, key parameters such as heating load, steam temperature, and pressure. This information provides data support for subsequent judgment and decision-making.

[0080] Step S20: Based on the operating condition information, determine whether the heating load of the heating module meets the heating demand of the external heating equipment.

[0081] Understandably, the system will compare and analyze the heating load of the heating module with the heating demand of external heating equipment. This step is crucial for dynamically adjusting the operating status of the thermal storage module, aiming to ensure that the heating system can be flexibly adjusted according to actual needs.

[0082] Step S30: When the heating load meets the heating demand of the external heating equipment, control the heat storage module to store excess heat energy.

[0083] Step S40: When the heating load does not meet the heating demand of the external heating equipment, control the heat storage module to supplement heat energy.

[0084] Step S50: When the heating module stops supplying heat, control the heat storage module to store heat using off-peak electricity.

[0085] Understandably, if the heating load of the heating module exceeds the actual demand of the external heating equipment, the system will control the thermal storage module to activate the storage mode, storing the excess heat energy for later use. This step helps balance the heat output of the heating system and avoid energy waste.

[0086] Conversely, if the heating load of the heating module cannot meet the heating demand of external heating equipment, the system will control the thermal storage module to release stored heat energy to supplement the heating capacity of the heating module. This step ensures that the heating system can provide stable and continuous heat energy during peak demand periods.

[0087] Meanwhile, when the heating module stops supplying heat, the system will utilize off-peak electricity to drive the thermal storage module for heat storage. This step not only helps reduce operating costs but also provides rapid thermal support when the heating module restarts.

[0088] Furthermore, after the step of controlling the thermal storage module to utilize off-peak electricity for heat storage when the heating module stops supplying heat, the method further includes: when the heating load meets the heating demand of external heating equipment or the heating module stops supplying heat, controlling the thermal storage module to output heat energy to the cascade heating module; and controlling the cascade heating module to convert the heat energy into energy of different gradients for heating.

[0089] In this embodiment, building upon the previous embodiments, the operating status information of the heating module is acquired in real time, and the working state of the thermal storage module is dynamically adjusted based on this information, ensuring the efficient and stable operation of the oilfield heating system. Simultaneously, by introducing cascaded heat utilization modules, cascaded utilization of thermal energy and maximization of benefits are achieved, providing strong support for the sustainable development and energy conservation and emission reduction of the oilfield.

[0090] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the control method of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0091] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, the computer-readable program instructions being used to execute the control method described in the above embodiments.

[0092] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0093] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0094] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0095] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0096] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the above-described control method, which can solve the technical problems of poor flexibility and economy in existing oilfield heating systems. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as the beneficial effects of the control method provided in the above embodiments, and will not be repeated here.

[0097] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the control method described above.

[0098] The computer program product provided in this application can solve the technical problems of poor flexibility and economy in existing oilfield heating systems. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as the beneficial effects of the control method provided in the above embodiments, and will not be repeated here.

[0099] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. An oilfield heating system, characterized in that, The system includes: a heating module and a heat storage module; The heating module is connected to the heat storage module and external heat-using equipment; The heat storage module is also connected to external heat-using equipment; The heating module is used to output heat energy to external heat-using equipment, and also to output the remaining heat energy to the heat storage module when the heating load is excessive. The heat storage module is used to store the remaining heat energy of the heating module; The heat storage module is also used to output heat energy to external heat-using equipment when the heating module's heating load is insufficient; The heat storage module is also used to store heat using off-peak electricity when the heating module stops supplying heat.

2. The oilfield heating system as described in claim 1, characterized in that, The system also includes: a cascade heating module; The heat storage module is also connected to the cascade heat consumption module; The thermal storage module is also used to output thermal energy to the cascade heat-using module; The cascade heat module is used to convert the heat energy transmitted by the heat storage module into energy of different gradients for heating.

3. The oilfield heating system as described in claim 2, characterized in that, The heating module includes: a combined heat and power unit; The combined heat and power unit is connected to the thermal storage module and external heat-using equipment; The combined heat and power unit is used to output heat energy to external heat-using equipment, and also to output hot steam to the heat storage module when there is excess heat load.

4. The oilfield heating system as described in claim 3, characterized in that, The thermal storage module includes: a steam accumulator, a screw compressor, and a heater; The steam accumulator is connected to the screw compressor and the cascade heat module, respectively. The heater is connected to the cogeneration unit and the screw compressor, respectively. The steam accumulator is used to receive hot steam and then generate saturated water through condensation to store energy. The steam accumulator is also used to flash saturated water to generate hot steam to heat external heat-consuming equipment when the heating load is insufficient. The heater is used to heat the gas from the cogeneration unit using off-peak electricity when the cogeneration unit stops supplying heat, and outputs the heated gas to the screw compressor. The screw compressor is used to compress heated gas into saturated steam for heat storage using off-peak electricity. The steam accumulator is also used to output hot steam to heat the cascade heat module.

5. The oilfield heating system as described in claim 4, characterized in that, The thermal storage module also includes: a water tank, an energy storage water supply pump, and a regenerative water supply pump; The water tank is connected to the steam accumulator via the energy storage water pump. The water tank is also connected to the cogeneration unit via the regenerative water supply pump; The water tank is used to store water for the equipment and also to replenish the water for the steam accumulator and the combined heat and power unit.

6. The oilfield heating system as described in claim 5, characterized in that, The cascade heat-using module includes: a screw expander; The screw expander is connected to the steam accumulator; The screw expander is used to generate electricity after receiving hot steam from the steam accumulator, and to provide heat through the exhaust gas generated by the expansion power generation.

7. A control method, characterized in that, The method applies the oilfield heating system as described in any one of claims 1 to 6, and the method includes: Obtain operating information of the heating module; Based on the operating condition information, determine whether the heating load of the heating module meets the heating demand of the external heating equipment. When the heating load meets the heating demand of external heating equipment, the heat storage module is controlled to store excess heat energy. When the heating load does not meet the heating demand of external heating equipment, the heat storage module is controlled to supplement heat energy. When the heating module stops supplying heat, the control heat storage module utilizes off-peak electricity to store heat.

8. The control method as described in claim 7, characterized in that, The step of controlling the thermal storage module to utilize off-peak electricity for heat storage when the heating module stops supplying heat also includes: When the heating load meets the heating demand of the external heating equipment or the heating module stops supplying heat, the heat storage module is controlled to output heat energy to the cascade heating module. The cascade heating module is controlled to convert thermal energy into energy of different gradients for heating.

9. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the control method as described in any one of claims 7 to 8.

10. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the steps of the control method as described in any one of claims 7 to 8.

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