Heat pump system and heavy oil thermal recovery system

Abstract

The invention provides a heat pump system and a heavy oil thermal recovery system.The heat pump system comprises a working medium side, heat exchange working medium circulation is formed in the working medium side, the working medium side comprises a gas compressor and a turbine which are sequentially arranged according to the flow of a heat exchange working medium, the gas compressor is suitable for compressing the heat exchange working medium, and the turbine is suitable for recycling pressure energy of the heat exchange working medium; the turbine is coaxially connected with the gas compressor, and torque generated by rotation of the turbine is transmitted to the gas compressor, so that the gas compressor compresses the heat exchange working medium; water-steam circulation is formed in the steam side, and the steam side comprises a first heat exchanger suitable for conducting heat exchange on water and first waste heat generated by an external industrial scene so as to preheat the water in the steam side; the preheated water on the steam side communicates with the cold side of the heat exchanger, the heat exchange working medium, compressed by the gas compressor, on the working medium side communicates with the hot side of the heat exchanger, and the heat exchanger is suitable for containing water and the heat exchange working medium for heat exchange so that the water on the cold side can be heated and steam can be generated.

Description

Technical Field

[0001] At least one embodiment of the present disclosure relates to the field of energy utilization technology, and specifically to a heat pump system and a heavy oil thermal recovery system. Background Art

[0002] In some industrial scenarios, high-temperature and high-pressure steam is often required. For example, in industrial scenarios where steam-assisted gravity draining (SAGD) technology is used, high-temperature and high-pressure steam is injected to heat the oil reservoir to reduce the viscosity of the crude oil, so that it flows to the production well under the action of gravity and is produced by the production well.

[0003] At present, for the above industrial scenarios, steam is generally generated by burning natural gas or other fuels in boilers to heat water. To this end, it not only consumes a large amount of fuel, but also produces carbon oxides and / or nitrogen oxides that need to be collected and processed during the fuel combustion process.

[0004] In view of this, how to provide a technical method for producing steam without consuming fuel has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In order to solve at least one of the above and other technical problems in the prior art, the present disclosure provides a heat pump system and a heavy oil thermal recovery system, which gradually heats the water on the steam side through a heat-increasing heat pump system until steam of the required temperature and pressure is produced.

[0006] The embodiment of the present disclosure provides a heat pump system, including: a working fluid side, a heat exchange working fluid cycle is formed in the working fluid side, the working fluid side includes a compressor and a turbine arranged in sequence according to the flow rate of the heat exchange working fluid, the compressor is suitable for compressing the heat exchange working fluid, the turbine is suitable for recovering the pressure energy of the heat exchange working fluid, and the turbine and the compressor are coaxially connected to transmit the torque generated by the rotation of the turbine to the compressor, so that the compressor compresses the heat exchange working fluid; a steam side, a water-steam cycle is formed in the steam side, the industrial steam side includes a first heat exchanger, which is suitable for heat exchanging water with the first waste heat generated by the external industrial scene to preheat the water in the steam side; and a heat exchanger, the preheated water on the steam side is connected to the cold side of the heat exchanger, the heat exchange working fluid compressed by the compressor on the working fluid side is connected to the hot side of the heat exchanger, and the heat exchanger is suitable for accommodating water and the heat exchange working fluid for heat exchange, so that the water on the cold side is heated and generates steam.

[0007] According to an embodiment of the present disclosure, the compressor is configured to be driven by an electric motor.

[0008] According to an embodiment of the present disclosure, the motor is further configured to be powered by renewable energy.

[0009] According to an embodiment of the present disclosure, the working fluid side further includes a pressure regulating module, which is suitable for regulating the pressure of the heat exchange working fluid entering the compressor.

[0010] According to an embodiment of the present disclosure, the working fluid side further includes a heat storage portion, which is disposed between the compressor and the heat exchanger and is suitable for storing at least a portion of the heat in the compressed heat exchange working fluid.

[0011] According to an embodiment of the present disclosure, the working fluid side also includes a second heat exchanger, which is arranged upstream of the compressor according to the flow direction of the heat exchange working fluid and is suitable for performing heat exchange between the heat exchange working fluid and the first waste heat to heat the heat exchange working fluid.

[0012] According to an embodiment of the present disclosure, the working fluid side also includes a third heat exchanger, which is arranged upstream of the compressor according to the flow direction of the heat exchange working fluid and is suitable for exchanging heat between the heat exchange working fluid and the utilized steam on the steam side to heat the heat exchange working fluid.

[0013] An embodiment of the present disclosure also provides a heavy oil thermal recovery system, comprising: a steam injection well and a production well drilled in an oil reservoir; and a heat pump system, wherein an output end of the steam side of the heat pump system is connected to the steam injection well, and is suitable for injecting generated steam into the steam injection well to contact with cold oil in the steam injection well and release heat to form a steam chamber; wherein the steam injection well and the production well include horizontal wells, and the steam injection well is located above the production well.

[0014] According to an embodiment of the present disclosure, the heat pump system is suitable for recovering the first waste heat of the produced fluid generated by the production well.

[0015] According to an embodiment of the present disclosure, at least a portion of the water in the produced fluid enters the steam side for circulation.

[0016] According to the heat pump system and heavy oil thermal recovery system provided by the present disclosure, a heat-increasing heat pump system is used to replace the current method of heating the water on the steam side by burning fuel in a boiler. The compressor configured on the working fluid side is used to increase the pressure of the heat exchange working fluid, thereby increasing the hot side temperature of the heat exchanger to increase the heat exchange amount on the steam side in the heat exchanger, so as to achieve the design requirement of "large temperature increase" and produce high-temperature and high-pressure steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of heat pump system module connection according to an illustrative embodiment of the present disclosure.

[0018] In the drawings, the meanings of the reference numerals are as follows:

[0019] 1. Working fluid side;

[0020] 11. Turbine;

[0021] 12. Pressure regulation module;

[0022] 13. Second heat exchanger;

[0023] 14. The third heat exchanger;

[0024] 15. Compressor;

[0025] 16. Heat storage unit;

[0026] 17. Motor;

[0027] 2. Heat exchanger;

[0028] 3. Steam side;

[0029] 31. Water pump;

[0030] 32. A first heat exchanger; and

[0031] 4. Horizontal well. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0033] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0034] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification, and should not be interpreted in an idealized or overly rigid manner.

[0035] When using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, and C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc. When using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted as the meaning of the expression generally understood by those skilled in the art. For example, "a system having at least one of A, B, or C" should include but not be limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.

[0036] In some industrial scenarios, high-temperature and high-pressure steam is often required. For example, in industrial scenarios where steam-assisted gravity draining (SAGD) technology is used, two horizontal wells are drilled in the reservoir, including a steam injection well at the top and a production well at the bottom.

[0037] High-temperature and high-pressure steam is injected into the reservoir through the steam injection well, and it releases heat when it contacts the cold oil, which raises the temperature of the oil layer. When the temperature of the oil layer rises, the viscosity of the oil will be greatly reduced, so that the heavy oil or asphalt that was originally unextractable will begin to flow. As the steam diffuses in the oil reservoir, the heavy oil or asphalt will flow downward under the action of gravity and gather in the production well. The condensed water after the steam condenses, the heavy oil or asphalt, the sand and gravel in the oil reservoir and other impurities will be mixed in the production well to form the produced fluid, which will be uniformly extracted to the outside.

[0038] At present, for the above-mentioned industrial scenarios, the prepared steam is generated by burning hot water in a boiler. In the process of burning hot water, not only a large amount of fuel is consumed, but also the carbon oxides and nitrogen oxides generated by the burning fuel need to be processed. Therefore, its energy consumption is high and the process is complicated.

[0039] On this basis, heat pump technology, as a means with high heat exchange efficiency and reliability, can also be used to produce steam. However, in actual application, heat pump systems often find it difficult to meet the design requirements of "large temperature rise" and the production of high-pressure steam. Therefore, the use of heat pump systems to produce high-temperature and high-pressure steam is hindered.

[0040] In view of this, how to provide a heat pump system and a heavy oil thermal recovery system based on the same inventive concept has become a technical problem that needs to be solved urgently.

[0041] Figure 1 It is a schematic diagram of heat pump system module connection according to an illustrative embodiment of the present disclosure.

[0042] According to the heat pump system provided by the present disclosure, Figure 1 As shown, it includes a working medium side 1, a steam side 3 and a heat exchanger 2. A heat exchange working medium cycle is formed in the working medium side 1. The working medium side 1 includes a compressor 15 and a turbine 11 arranged in sequence according to the flow rate of the heat exchange working medium. The compressor 15 is suitable for compressing the heat exchange working medium. The turbine 11 is suitable for recovering the pressure energy of the heat exchange working medium. The turbine 1 and the compressor 15 are coaxially connected to transmit the torque generated by the rotation of the turbine 1 to the compressor 15 to compress the heat exchange working medium. A water-steam cycle is formed in the steam side 3. The steam side 3 includes a first heat exchanger 32, which is suitable for heat exchanging water with the first waste heat generated by the external industrial scene to preheat the water in the steam side 3. The preheated water on the steam side 3 is connected to the cold side of the heat exchanger 2, and the heat exchange working medium compressed by the compressor 15 on the working medium side 1 is connected to the hot side of the heat exchanger 2. The heat exchanger 2 is suitable for accommodating water and the heat exchange working medium for heat exchange, so that the water on the cold side is heated and generates steam.

[0043] In an illustrative embodiment, the working medium side 1 includes a pipeline with a heat exchange working medium built in, and the pipeline includes but is not limited to a pump, a valve, a flow meter, a pressure gauge, a filter, an expansion tank, a compensator, and at least a part of an exhaust valve, so that the heat exchange working medium can form a closed cycle on the working medium side 1. In this way, it is helpful to broaden the application scope of the heat pump system to suit a variety of industrial scenarios.

[0044] The working fluid circulating in the working fluid side 1 includes, but is not limited to, air, helium, carbon dioxide and other gaseous working fluids suitable for heat exchange with the steam side 3 .

[0045] In such an embodiment, a first heat exchanger 32 is provided in the steam side 3, and the third heat exchanger 32 uses the first waste heat in the industrial scene (such as the produced fluid produced by the production well described below) to perform heat exchange with the normal temperature water on the cold side to preheat the normal temperature water on the steam side 3. The heat exchange working medium in the closed cycle on the working medium side 1 is compressed by the compressor 15 during the circulation process, thereby increasing the temperature of the hot side of the heat exchanger 2 to increase the heat exchange capacity of the steam side 3 in the heat exchanger 2. Through the above design, water at normal temperature (such as about 25°C) can be heated to a higher preheating temperature (such as about 140°C) after being preheated with the first heat exchanger 32, and finally heat-exchanged with the high-temperature heat exchange working medium in the heat exchanger 2 to be heated to a suitable high temperature (such as about 260°C) and high pressure state.

[0046] In this way, compared with the current heat pump system, it meets the design requirements of "large temperature rise" and breaks through the current limitation of not being able to produce high-temperature and high-pressure steam through the heat pump system. Furthermore, compared with the traditional method of generating steam by burning hot water in a boiler, there is no need to burn fuel. Therefore, it can be seen that it will not produce carbon oxides and nitrogen oxides, which helps to reduce energy consumption and carbon and nitrogen emissions.

[0047] According to the embodiments of the present disclosure, Figure 1 As shown, the compressor 15 is configured to be driven by an electric motor 17 .

[0048] According to the embodiments of the present disclosure, Figure 1 As shown, the electric machine 17 is also configured to be powered by renewable energy.

[0049] In an illustrative embodiment, Figure 1 As shown, the shaft of the compressor 15, the shaft of the turbine 11 and the output shaft of the motor 17 are coaxially connected through a coupling. In detail, the compressor 15 is driven by the motor 17 to compress the heat exchange medium to a high temperature and high pressure state. Further, after the high temperature and high pressure heat exchange medium is heat exchanged in the heat exchanger 2, the low temperature and high pressure heat exchange medium releases pressure energy through the turbine 11 to enter the next cycle.

[0050] The turbine 11 rotates due to the pressure energy released by the heat exchange medium. Since the turbine 11 is coaxially connected with the motor 17 and the compressor 15, that is, the output shaft of the motor 17 is coaxially connected with the drive shaft of the compressor 15 and the main shaft of the turbine 11. When the heat exchange medium passes through the blades of the rotor of the turbine 11, its pressure energy (released energy and kinetic energy) is converted into kinetic energy for driving the rotor (including the main shaft) to rotate. Since the main shaft is axially connected with the drive shaft of the compressor 15 (via a coupling), the impeller of the compressor 15 can be rotated, and the heat exchange medium passing through the compressor 15 is compressed through the stator and the diffuser.

[0051] Furthermore, the drive shaft of the compressor 15 is also axially connected to the drive shaft of the motor 17 to drive the compressor 15 to operate stably. The motor 17 is driven by an external power supply, and the power supply of the power supply preferably adopts renewable energy, such as electricity generated by solar panels, wind power, hydropower, etc. Since the electricity generated by renewable energy is not stable enough, corresponding power storage equipment and voltage and current stabilizing equipment are also required to meet the storage and use of electricity.

[0052] In such an embodiment, the coaxially arranged compressor 15, motor 17 and turbine 11 form an integrated design, which makes the layout compact and has a high power density, suitable for recovering the pressure energy in the heat exchange medium. Further, by coupling the turbine 11 with the power generation of external renewable energy, it can be supplied to the compressor 15, so as to further reduce the energy consumption of the heat pump system.

[0053] According to the embodiments of the present disclosure, Figure 1 As shown, the working medium side 1 further includes a pressure regulating module 12 , which is suitable for regulating the pressure of the heat exchange working medium entering the compressor 15 .

[0054] In an illustrative embodiment, Figure 1 As shown, the pressure regulating module 12 is arranged on the working medium side 1 and is connected in series with the compressor 15. In detail, the pressure regulating module 12 includes but is not limited to regulating the pressure and / or flow of the heat exchange working medium entering the input end of the compressor 15 in the working medium side 1 by a pressure-flow method or a volume-flow method.

[0055] In an illustrative embodiment, the pressure regulating module 12 includes but is not limited to a valve and / or a valve group disposed in the pipeline of the working medium side 1. In this way, the flow rate of the heat exchange working medium passing through the compressor 15 can be adjusted by adjusting the opening of the valve or the valve group. It should be understood that the embodiments of the present disclosure are not limited thereto.

[0056] For example, if necessary, a corresponding pump may be added to the pressure regulating module 12 to further adjust the flow rate of the heat exchange medium during the circulation process.

[0057] In such an embodiment, the pressure regulating module is set to adjust the pressure and flow of the heat exchange medium entering the input end of the compressor 15, thereby adjusting the outlet pressure and temperature of the heat exchange medium output through the output end of the compressor 15, and finally adjusting the heating power of the heat exchanger 2, so that the parameters (such as temperature and pressure, etc.) of the steam exchanged through the heat exchanger 2 can be adjusted, so that the heat pump system can quantitatively control the output steam to meet the required steam usage requirements in different industrial scenarios.

[0058] According to the embodiments of the present disclosure, Figure 1 As shown, the working medium side 1 further includes a heat storage portion 16, which is disposed between the compressor 15 and the heat exchanger 2 and is suitable for storing at least a portion of the heat in the compressed heat exchange working medium.

[0059] In an illustrative embodiment, a heat storage medium (such as molten salt or thermal phase change material, etc.) is built into the heat storage part 16. In detail, the heat storage part 16 is arranged between the output end of the compressor 15 and the hot side of the heat exchanger 2 to store at least a portion of the heat in the high-temperature and high-pressure heat exchange medium in the heat storage part 16, or to make the high-pressure heat exchange medium absorb heat when passing through the heat storage part 6 to achieve a high-temperature and high-pressure state.

[0060] In such an embodiment, the heat storage part arranged between the compressor 15 and the heat exchanger 2 can be used to store excess heat energy in the heat exchange medium, and can also supplement its heat energy when the temperature of the heat exchange medium is low to maintain the stable operation of the heat pump system.

[0061] According to the embodiments of the present disclosure, Figure 1 As shown, the working medium side 1 also includes a second heat exchanger 13, which is arranged upstream of the compressor 15 according to the flow direction of the heat exchange working medium and is suitable for performing heat exchange between the heat exchange working medium and the first waste heat to heat the heat exchange working medium.

[0062] According to the embodiments of the present disclosure, Figure 1 As shown, the working medium side 1 also includes a third heat exchanger 14, which is arranged upstream of the compressor 15 according to the flow direction of the heat exchange working medium and is suitable for performing heat exchange between the heat exchange working medium and the utilized steam on the steam side 3 to heat the heat exchange working medium.

[0063] In an illustrative embodiment, Figure 1 As shown, the second heat exchanger 13 and the third heat exchanger 14 are sequentially arranged between the pressure regulating module 12 and the air inlet end of the compressor 15 according to the flow direction of the heat exchange medium. In detail, the second heat exchanger 13 includes but is not limited to using the first waste heat in the industrial scene (such as the produced fluid produced by the production well described below) to exchange heat with the normal temperature water on the cold side. The industrial scenes of the waste heat used by the second heat exchanger 13 and the first heat exchanger 32 can be the same or different. Furthermore, the steam used in the industrial scene (such as the horizontal well 4, i.e., the steam injection well) is also connected to the hot side of the third heat exchanger 14 to further heat the heat exchange medium in the working medium side 1.

[0064] In such an embodiment, by providing the first heat exchanger 32, the second heat exchanger 13 and the third heat exchanger 14 in the heat pump system, the working fluid side 1 and the steam side 3 of the heat pump system are respectively connected to the waste heat source in the external industrial scene to form a step heat exchange, thereby making full use of the external waste heat, so that the heat pump system can achieve heat energy output in a wide temperature range.

[0065] Based on the same inventive concept, the present disclosure also provides a heavy oil thermal recovery system, not shown in the figure, including a steam injection well and a production well drilled in the oil reservoir, and a heat pump system. The output end of the steam side 3 of the heat pump system is connected to the steam injection well, which is suitable for injecting the generated steam into the steam injection well to contact with the cold oil in the steam injection well and release heat to form a steam chamber. Among them, the steam injection well and the production well include a horizontal well 4, and the steam injection well is located above the production well.

[0066] According to an embodiment of the present disclosure, the heat pump system is suitable for recovering the first waste heat of the produced fluid generated by the production well.

[0067] In an illustrative embodiment, not shown in the figure, the horizontal well 4 includes a steam injection well located at the top and a production well located at the bottom. Among them, the steam side 3 of the heat pump system is equipped with a water pump 31 to extract normal temperature water for circulation in the steam side 3, so that the water in the steam side 3 is pressurized, and the heat exchange working medium on the working medium side 1 is fully exchanged with the heat exchanger 2 to generate high-temperature and high-pressure steam. Steam is injected into the oil reservoir through the steam injection well, and releases heat in contact with the cold oil, so that the temperature of the oil layer increases. When the temperature of the oil layer increases, the viscosity of the oil will be greatly reduced, so that the heavy oil or asphalt that was originally unextractable will begin to flow. As the steam diffuses in the oil reservoir, the heavy oil or asphalt will flow downward under the action of gravity, gather in the production well and be finally extracted.

[0068] In some exemplary embodiments, the heat pump system is specifically designed based on the above-mentioned industrial scenario, namely, the characteristics of the industrial scenario of Steam Assisted Gravity Drainage (SAGD) technology.

[0069] The produced fluid extracted from the production well is extracted from the production well in a liquid state of approximately 160°C and 6.19 bar. In this state, the produced fluid can be recovered for waste heat to be connected to the hot sides of the first heat exchanger 32 and the second heat exchanger 13, thereby preheating the normal temperature water (such as 25.41°C, 53 bar) in the steam side 3 and the heat exchange working fluid in the working fluid side 1, respectively.

[0070] On this basis, the preheated normal temperature water can be heated to a liquid state of approximately 140°C and 53 bar before entering the cold side of the heat exchanger 2; further, the preheated heat exchange medium can be preheated to a gaseous state of 140°C and 1.01 bar before entering the input end of the compressor 15.

[0071] When the heat exchange medium continues to pass through the compressor 15, it can be compressed to a gaseous state of 464.44°C and 5.62 bar. After further heat exchange with the water in the steam side 3 through the heat exchanger 2, the water can be heated to a gaseous state of 267.62°C and 53 bar (i.e., steam). In this way, the heavy oil thermal recovery system can produce the steam required for producing the produced liquid without burning fuel.

[0072] According to an embodiment of the present disclosure, at least a portion of water in the produced fluid enters the steam side 3 for circulation.

[0073] In an illustrative embodiment, the heavy oil thermal recovery system is also equipped with processing equipment and water treatment equipment. The processing equipment includes but is not limited to being configured to remove at least a portion of ethylene glycol in the produced fluid, and the water treatment equipment is configured to condense and filter at least a portion of water in the produced fluid and return the water to the steam side 3 for the next cycle.

[0074] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only reference directions of the drawings and are not intended to limit the scope of protection of the present disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or configurations will be omitted when they may cause confusion in the understanding of the present disclosure.

[0075] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. The scope of the present disclosure is defined by the attached claims and their equivalents. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A heat pump system, characterized in that: include: A working medium side (1), wherein a heat exchange working medium cycle is formed in the working medium side (1), wherein the working medium side (1) comprises a compressor (15) and a turbine (11) which are arranged in sequence according to the flow rate of the heat exchange working medium, wherein the compressor (15) is adapted to compress the heat exchange working medium, and the turbine (11) is adapted to recover the pressure energy of the heat exchange working medium, and wherein the turbine (1) and the compressor (15) are coaxially connected to transmit the torque generated by the rotation of the turbine (1) to the compressor (15), so that the compressor (15) compresses the heat exchange working medium; A steam side (3), wherein a water-steam cycle is formed in the steam side (3), and the steam side (3) comprises a first heat exchanger (32) adapted to perform heat exchange between water and first waste heat generated by an external industrial scene, so as to preheat the water in the steam side (3); and A heat exchanger (2), wherein the preheated water on the steam side (3) is connected to the cold side of the heat exchanger (2), and the heat exchange medium compressed by the compressor (15) on the working medium side (1) is connected to the hot side of the heat exchanger (2), and the heat exchanger (2) is suitable for accommodating water and the heat exchange medium for heat exchange, so that the water on the cold side is heated and steam is generated.

2. The heat pump system according to claim 1, characterized in that: The compressor (15) is configured to be driven by an electric motor (17).

3. The heat pump system according to claim 2, characterized in that: The electric motor (17) is also configured to be powered by renewable energy.

4. The heat pump system according to claim 1, characterized in that: The working medium side (1) further comprises a pressure regulating module (12) adapted to regulate the pressure of the heat exchange working medium entering the compressor (15).

5. The heat pump system according to claim 1, characterized in that: The working medium side (1) further comprises a heat storage part (16), which is arranged between the compressor (15) and the heat exchanger (2) and is suitable for storing at least a portion of the heat in the compressed heat exchange working medium.

6. The heat pump system according to claim 1, characterized in that: The working medium side (1) further comprises a second heat exchanger (13), which is arranged upstream of the compressor (15) according to the flow direction of the heat exchange working medium and is suitable for performing heat exchange between the heat exchange working medium and the first waste heat to heat the heat exchange working medium.

7. The heat pump system according to claim 1, characterized in that: The working medium side (1) further comprises a third heat exchanger (14), which is arranged upstream of the compressor (15) according to the flow direction of the heat exchange working medium and is suitable for performing heat exchange between the heat exchange working medium and the utilized steam on the steam side (3) to heat the heat exchange working medium.

8. A heavy oil thermal recovery system, characterized in that: include: Steam injection wells and production wells drilled in oil reservoirs; as well as The heat pump system according to any one of claims 1 to 7, wherein the output end of the steam side (3) of the heat pump system is connected to the steam injection well, and is suitable for injecting the generated steam into the steam injection well to contact with the cold oil in the steam injection well and release heat to form a steam chamber; The steam injection well and the production well comprise a horizontal well (4), and the steam injection well is located above the production well.

9. The heavy oil thermal recovery system according to claim 8, characterized in that: The heat pump system is suitable for recovering the first waste heat of the produced fluid generated by the production well.

10. The heavy oil thermal recovery system according to claim 9, characterized in that: At least a portion of the water in the produced fluid enters the steam side (3) for circulation.

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