A device for reducing the viscosity of heavy oil using carbon dioxide based on multiphase flow mixing
By using a multi-phase flow mixed carbon dioxide heavy oil viscosity reduction device in heavy oil mining, a supercritical state and recycling carbon dioxide is formed, which solves the problems of high cost of heavy oil equipment and unstable heating viscosity reduction, and achieves the stability of heavy oil Reduce viscosity and improve environmental protection.
Patent Information
- Application Number
- CN202410882445.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-03
- Publication Date
- 2024-12-17
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the existing heavy oil mining technology, bulky equipment increases the mining cost, and the method of heating to reduce viscosity is unstable, resulting in the problem of heat loss and viscosity increase in heavy oil during transportation.
Using a carbon dioxide thick oil viscosity reduction device based on multiphase flow mixing, the supercritical state of carbon dioxide is formed in the pressure box to mix it with the heavy oil, the viscosity of the heavy oil is reduced by using a stirring motor, and the liquid nitrogen is rapidly cooled and cycled. Utilize carbon dioxide to reduce chemical use and resource waste.
It achieves stable and reduced viscosity of heavy oil, reduces equipment costs and heat loss, improves the conveying efficiency and environmental protection of heavy oil, and adapts to the needs of different heavy oil wells.
Smart Images
Figure CN118815425B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a carbon dioxide thick oil viscosity reduction device based on multiphase flow mixing, belonging to the technical field of oil and gas field development engineering. Background Art
[0002] With the development of industrial technology, modern heavy oil extraction technology has become more and more perfect. For the extraction of heavy oil, a high-power pump is required to transport the heavy oil. The heavy equipment used in heavy oil extraction increases the extraction cost, and the heavy heavy oil extraction equipment requires a lot of manpower costs when it is built or disassembled.
[0003] Secondly, in the past, heavy oil was heated to reduce its viscosity. The heated heavy oil would lose heat during transportation. When the temperature of the heavy oil gradually decreased, its viscosity would also increase slowly. The heating method to reduce the viscosity of heavy oil is not stable. Summary of the invention
[0004] The purpose of the present invention is to provide a carbon dioxide heavy oil viscosity reduction device based on multiphase flow mixing in view of the deficiencies in the prior art. When the device is in use, carbon dioxide gas is pushed into a closed pressure box. At this time, liquid nitrogen is injected into all U-shaped tubes through a charging pipe and a diverging charging pipe, so that the carbon dioxide inside the pressure box forms a supercritical state under a low temperature and high pressure environment. The supercritical gas-liquid mixture of carbon dioxide has extremely strong solubility. The supercritical carbon dioxide is transported to the inside of a mixing box to dissolve the heavy components in the heavy oil in the carbon dioxide. The first stop valve and the second stop valve at the upper and lower parts of the mixing box are locked at the same time to form a closed space inside the mixing box. The stirring motor drives the stirring impeller to stir the heavy oil inside the mixing box to reduce its viscosity, thereby solving the problems mentioned in the background technology.
[0005] To solve the above problems, the present invention provides the following technical solutions: a carbon dioxide heavy oil viscosity reduction device based on multiphase flow mixing, comprising a pressure box, a carbon dioxide supercritical preparation component is arranged inside the pressure box, a feeding steel pipe is arranged on the front side wall of the pressure box, a pressure relief valve is arranged inside the feeding steel pipe, and the end of the feeding steel pipe is connected to a conveying pipe; a mixing box is arranged on one side of the pressure box, the conveying pipe is connected to the inside of the mixing box, a production pipe is arranged on the top of the mixing box, a stirring device is arranged inside the mixing box, a pressure control component is arranged on the upper and lower side walls of the mixing box, and a stirring component is also arranged inside the mixing box; a receiving box is arranged below the mixing box, the mixing box and the receiving box are connected by a conveying pipe, and a recycling component is arranged between the receiving box and the pressure box.
[0006] Compared with conventional chemical viscosity reduction, the device of the present invention utilizes the physical dissolution effect of carbon dioxide, reduces the use of chemical agents, and is green and environmentally friendly. At the same time, the mixing reactor and the separation unit adopt a modular design, and the processing capacity can be flexibly adjusted to meet the needs of different heavy oil wells.
[0007] Furthermore, the carbon dioxide supercritical preparation component includes five U-shaped tubes in a linear array, and ten through holes matching the ports of the U-shaped tubes are arranged on the side walls of the pressure box. The front ports of the U-shaped tubes are all provided with divergent filling tubes, which are centrally connected to the filling tubes, and the outer ends of the filling tubes are provided with first liquid nitrogen valves, which are connected to the liquid nitrogen input pumps, and the rear ports of the U-shaped tubes are all provided with collecting tubes, which are centrally connected to the discharge tubes, and the outer ends of the discharge tubes are provided with liquid nitrogen discharge valves.
[0008] Furthermore, heat-conducting fins are arranged on the side walls of the U-shaped tube. The material of the heat-conducting fins is metal aluminum and the thickness of the heat-conducting fins is one millimeter.
[0009] Furthermore, the pressure control assembly includes a first stop valve and a second stop valve, the first stop valve is arranged at an inlet above the mixing box, and the second stop valve is arranged at an outlet below the mixing box.
[0010] Furthermore, the stirring assembly includes a stirring motor on the side wall of the mixing box, a square opening is provided on the side wall of the mixing box, the outer wall of the stirring motor and the inner wall of the square opening are connected by sealant, and a stirring impeller is also provided at the output end of the stirring motor.
[0011] Furthermore, the recycling and reuse component includes a vertical pipe at the top of the storage box, a recovery box is arranged at the top of the vertical pipe, a pressure pump is arranged on the side wall of the recovery box, the input end of the pressure pump extends to the interior of the recovery box, a return pipe is arranged at the output end of the pressure pump, a recovery steel pipe is arranged on the rear side wall of the pressure box, a pressure-stabilizing valve is arranged inside the recovery steel pipe, the end of the return pipe is connected to the recovery steel pipe, and a heating component is arranged on the recovery box.
[0012] Furthermore, the heating component includes an inner groove on the side wall of the recovery box, and an electric heating block is installed in the inner groove.
[0013] Furthermore, the U-shaped tube is made of high-speed steel, and a spiral groove is arranged on the inner wall of the U-shaped tube.
[0014] Compared with the prior art, the embodiments of the present application have the following beneficial effects:
[0015] Firstly, when the device is in use, the produced heavy oil is transported to the inside of the mixing box through the production pipe, and then the carbon dioxide gas is pushed into the closed pressure box. At this time, liquid nitrogen is injected into all U-tubes through the filling pipe and the divergent filling pipe, and then the carbon dioxide inside the pressure box forms a supercritical state under the low temperature and high pressure environment. The supercritical gas-liquid mixture of carbon dioxide has extremely strong solubility. The supercritical carbon dioxide is transported to the inside of the mixing box to dissolve the heavy components in the heavy oil in the carbon dioxide. The first stop valve and the second stop valve at the upper and lower parts of the mixing box are locked at the same time to form a closed space inside the mixing box, and the stirring motor drives the stirring impeller to stir the heavy oil inside the mixing box to reduce its viscosity.
[0016] Compared with conventional chemical viscosity reduction, the device of the present invention utilizes the physical dissolution effect of carbon dioxide, reduces the use of chemical agents, and is green and environmentally friendly. At the same time, the mixing reactor and the separation unit adopt a modular design, and the processing capacity can be flexibly adjusted to meet the needs of different heavy oil wells.
[0017] Secondly, the heavy oil will precipitate carbon dioxide after the heating and decompression treatment inside the storage box. The precipitated carbon dioxide is lifted into the recovery box, and the pressure pump extracts the carbon dioxide inside the recovery box and re-inputs it into the pressure box for recycling. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention from the front view.
[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention from a side view.
[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention when viewed from above.
[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the present invention in cross section.
[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the pressure box of the present invention.
[0023] Figure 6 It is a schematic diagram of the three-dimensional structure of the U-shaped tube of the present invention.
[0024] Description of reference numerals:
[0025] Pressure box 1, feed pipe 101, feed steel pipe 102, recovery steel pipe 103, mixing box 2, mining pipe 201, first stop valve 202, delivery pipe 203, second stop valve 204, storage box 3, riser 301, recovery box 302, stirring motor 4, pressure pump 5, reflux pipe 501, charging pipe 6, divergent charging pipe 601, first liquid nitrogen valve 602, discharge pipe 7, collection pipe 701, liquid nitrogen outlet valve 702, U-shaped tube 8, thermal fins 801. DETAILED DESCRIPTION
[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.
[0027] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0028] The present invention provides a device for reducing the viscosity of heavy oil using carbon dioxide based on multiphase flow mixing, such as Figure 1-6 As shown, it includes a pressure box 1, wherein a supercritical carbon dioxide preparation component is arranged inside the pressure box 1, a feeding steel pipe 102 is arranged on the front side wall of the pressure box 1, a pressure relief valve is arranged inside the feeding steel pipe 102, and the end of the feeding steel pipe 102 is connected to a conveying pipe 101; a mixing box 2 is arranged on one side of the pressure box 1, the conveying pipe 101 is connected to the inside of the mixing box 2, a mining pipe 201 is arranged on the top of the mixing box 2, a stirring device is arranged inside the mixing box 2, pressure control components are arranged on the upper and lower side walls of the mixing box 2, and a stirring component is also arranged inside the mixing box 2; a receiving box 3 is arranged below the mixing box 2, the mixing box 2 and the receiving box 3 are connected by a conveying pipe 203, and a recycling component is arranged between the receiving box 3 and the pressure box 1.
[0029] In this embodiment, the produced heavy oil is transported to the inside of the mixing box 2 through the production pipe 201, and then the carbon dioxide gas is pushed into the inside of the closed pressure box 1, and the pressure box 1 is subjected to high pressure and low temperature conditions, so that the carbon dioxide in the pressure box 1 forms a supercritical state under the low temperature and high pressure environment. The supercritical gas-liquid mixture of carbon dioxide has extremely strong solubility. The supercritical carbon dioxide is transported to the inside of the mixing box 2, so that the heavy components in the heavy oil are dissolved in the carbon dioxide. The heavy oil with reduced viscosity can be more easily transported to the inside of the storage box 3 through the delivery pipe 203 or subjected to other process treatments. Compared with the heavy oil treatment of the prior art, the previous heavy oil uses heating to reduce the viscosity, and the effect of reducing the viscosity by heating is relatively poor, and the heavy oil will lose heat during the transportation process, and the viscosity of the heavy oil is unstable during the transportation process. The carbon dioxide mixed with air pressure of the present invention has a better viscosity reduction effect, and the viscosity of the heavy oil is also relatively stable.
[0030] In a further embodiment of the present invention, Figure 1-6 As shown, the carbon dioxide supercritical preparation component includes five U-shaped tubes 8 in a linear array, and ten through holes matching the ports of the U-shaped tubes 8 are arranged on the side wall of the pressure box 1. The front ports of the U-shaped tubes 8 are all provided with divergent filling tubes 601, and the divergent filling tubes 601 are centrally connected to the filling tube 6. The outer end of the filling tube 6 is provided with a first liquid nitrogen valve 602, and the first liquid nitrogen valve 602 is connected to the liquid nitrogen input pump. The rear ports of the U-shaped tubes 8 are all provided with collecting tubes 701, and the collecting tubes 701 are centrally connected to the discharge pipe 7, and the outer port of the discharge pipe 7 is provided with a liquid nitrogen outlet valve 702.
[0031] In this embodiment, liquid nitrogen is injected into all the U-shaped tubes 8 through the charging tube and the diverging charging tube. The liquid nitrogen in the U-shaped tube 8 absorbs the heat of the carbon dioxide inside the pressure box 1, and the gasified liquid nitrogen is depressurized from the liquid nitrogen outlet valve 702, and then the lost liquid nitrogen is replenished from the first liquid nitrogen valve 602. The liquid nitrogen can quickly reduce the temperature of the carbon dioxide, causing the carbon dioxide to quickly reach a subcritical state. Compared with the compressor cooling method in the prior art, the compressor cooling consumes a lot of time, which reduces the work efficiency.
[0032] In a further embodiment of the present invention, Figure 1-6 As shown, a heat-conducting fin 801 is provided on the side wall of the U-shaped tube 8. The material of the heat-conducting fin 801 is metal aluminum, and the thickness of the heat-conducting fin 801 is one millimeter.
[0033] In this embodiment, the heat-conducting fins 801 on the outer side wall of the U-shaped tube 8 increase the heat exchange rate, and the heat of the carbon dioxide can be quickly transferred to the liquid nitrogen in the U-shaped tube 8 .
[0034] In a further embodiment of the present invention, Figure 1-3As shown, the pressure control assembly includes a first stop valve 202 and a second stop valve 204 . The first stop valve 202 is arranged at the inlet above the mixing box 2 , and the second stop valve 204 is arranged at the outlet below the mixing box 2 .
[0035] In this embodiment, after the mixing box 2 is loaded with heavy oil, the first stop valve 202 and the second stop valve 204 at the upper and lower parts of the mixing box 2 are locked at the same time to form a closed space inside the mixing box 2. The closed space can effectively reduce the precipitation and gasification of supercritical carbon dioxide and reduce the loss of supercritical carbon dioxide.
[0036] In a further embodiment of the present invention, Figure 1-3 As shown, the stirring assembly includes a stirring motor 4 on the side wall of the mixing box 2, a square opening is provided on the side wall of the mixing box 2, the outer wall of the stirring motor 4 and the inner wall of the square opening are connected by sealant, and a stirring impeller is also provided at the output end of the stirring motor 4.
[0037] In this embodiment, the stirring motor 4 drives the stirring impeller to stir the thick oil inside the mixing box 2 to reduce its viscosity.
[0038] In a further embodiment of the present invention, Figure 1-4 As shown, the recycling and reuse component includes a vertical pipe 301 at the top of the storage box 3, a recovery box 302 is arranged at the top of the vertical pipe 301, a pressure pump 5 is arranged on the side wall of the recovery box 302, the input end of the pressure pump 5 extends to the interior of the recovery box 302, and a return pipe 501 is arranged at the output end of the pressure pump 5. A recovery steel pipe 103 is arranged on the rear side wall of the pressure box 1, a pressure-stabilizing valve is arranged inside the recovery steel pipe 103, and the end of the return pipe 501 is connected to the recovery steel pipe 103. A heating component is arranged on the recovery box 302.
[0039] In this embodiment, the heavy oil will precipitate carbon dioxide after the heating and decompression treatment inside the storage box 3, and the precipitated carbon dioxide is lifted into the recovery box 302. The pressure pump 5 extracts the carbon dioxide inside the recovery box 302 and re-inputs it into the pressure box 1 for recycling, thereby reducing resource waste.
[0040] In a further embodiment of the present invention, Figure 1-4 As shown, the heating component includes an inner groove on the side wall of the recovery box 302, and an electric heating block is installed in the inner groove.
[0041] In this embodiment, the carbon dioxide released inside the recovery box 302 will be temporarily concentrated inside the recovery box 302, and the electric heating block will heat the side wall of the recovery box 302, so that the supercritical carbon dioxide will be converted into stable gaseous carbon dioxide, which is convenient for the extraction operation of the pressure pump 5.
[0042] In a further embodiment of the present invention, Figure 1-6As shown, the material of the U-shaped tube 8 is high-speed steel, and a spiral groove is arranged on the inner wall of the U-shaped tube 8 .
[0043] In this embodiment, the spiral grooves on the inner wall of the U-shaped tube 8 increase the contact surface with the liquid nitrogen, thereby increasing the heat conduction rate of the U-shaped tube 8 .
[0044] Working principle: The produced heavy oil is transported to the inside of the mixing box 2 through the production pipe 201, and then the carbon dioxide gas is pushed into the inside of the sealed pressure box 1, and the pressure box 1 is subjected to high pressure and low temperature conditions, so that the carbon dioxide inside the pressure box 1 forms a supercritical state under the low temperature and high pressure environment. The supercritical gas-liquid mixture of carbon dioxide has extremely strong solubility. The supercritical carbon dioxide is transported to the inside of the mixing box 2, so that the heavy components in the heavy oil are dissolved in the carbon dioxide. The heavy oil with reduced viscosity can be more easily transported to the inside of the storage box 3 through the delivery pipe 203 or subjected to other process treatments. Compared with the heavy oil treatment of the prior art, the previous heavy oil utilization The effect of reducing viscosity by heating is relatively poor, and the heavy oil will lose heat during transportation, and the viscosity of the heavy oil will be unstable during transportation. The gas-pressure mixed carbon dioxide of the present invention has a better viscosity reduction effect, and the viscosity of the heavy oil is also relatively stable. Liquid nitrogen is injected into all U-shaped tubes 8 through the filling pipe and the divergent filling pipe. The liquid nitrogen in the U-shaped tube 8 absorbs the heat of the carbon dioxide inside the pressure box 1, and the gasified liquid nitrogen is depressurized from the liquid nitrogen outlet valve 702, and then the lost liquid nitrogen is supplemented from the first liquid nitrogen valve 602. The liquid nitrogen can quickly reduce the temperature of the carbon dioxide, which promotes the rapid The subcritical state is reached. Compared with the compressor cooling method of the prior art, the compressor cooling consumes a lot of time and reduces the work efficiency. The heat transfer fins 801 on the outer wall of the U-shaped tube 8 increase the heat exchange rate. The heat of carbon dioxide can be quickly transferred to the liquid nitrogen in the U-shaped tube 8. After the mixing box 2 is loaded with heavy oil, the first stop valve 202 and the second stop valve 204 at the upper and lower parts of the mixing box 2 are locked at the same time to form a closed space inside the mixing box 2. The closed space can effectively reduce the precipitation and gasification of supercritical carbon dioxide and reduce the loss of supercritical carbon dioxide. The stirring motor 4 drives the stirring impeller to stir the heavy oil inside the mixing box 2 to reduce its viscosity. The heavy oil in the storage box 3 will precipitate carbon dioxide after the temperature increase and pressure reduction treatment. The precipitated carbon dioxide is lifted into the recovery box 302. The pressure pump 5 extracts the carbon dioxide in the recovery box 302 and re-inputs it into the pressure box 1 for recycling, which reduces the waste of resources. The precipitated carbon dioxide in the recovery box 302 will be temporarily concentrated in the recovery box 302, and the electric heating block heats the side wall of the recovery box 302 to turn the supercritical carbon dioxide into stable gaseous carbon dioxide, which is convenient for the extraction operation of the pressure pump 5. The spiral groove on the inner wall of the U-shaped tube 8 increases the contact surface with the liquid nitrogen, thereby increasing the thermal conductivity of the U-shaped tube 8.
[0045] It should be noted that, for the above-mentioned embodiments, for the sake of simplicity, they are all described as a series of action combinations, but those skilled in the art should know that the present invention is not limited by the described order of actions, because according to the present invention, some steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.
[0046] In the several embodiments provided in the present application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely schematic, such as the division of the above-mentioned units. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunication or other forms.
[0047] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to the scope of protection of the present invention.
Claims
1. A carbon dioxide heavy oil viscosity reduction device based on multiphase flow mixing, characterized in that: It comprises a pressure box (1), wherein a carbon dioxide supercritical preparation component is arranged inside the pressure box (1), a feeding steel pipe (102) is arranged on the front side wall of the pressure box (1), a pressure relief valve is arranged inside the feeding steel pipe (102), and the end of the feeding steel pipe (102) is connected to a conveying pipe (101); A mixing box (2) is arranged on one side of the pressure box (1), a material delivery pipe (101) is connected to the interior of the mixing box (2), a production pipe (201) is arranged at the top of the mixing box (2), pressure control components are arranged on the upper and lower side walls of the mixing box (2), and a stirring component is also arranged inside the mixing box (2); A storage box (3) is provided below the mixing box (2); the mixing box (2) and the storage box (3) are connected via a delivery pipe (203); and a recycling component is provided between the storage box (3) and the pressure box (1); The carbon dioxide supercritical preparation assembly comprises five U-shaped tubes (8) in a linear array, ten through holes matching the ports of the U-shaped tubes (8) are arranged on the side wall of the pressure box (1), and the front ports of the U-shaped tubes (8) are all provided with divergent filling tubes (601); The divergent filling pipe (601) is centrally connected to the filling pipe (6), the outer end of the filling pipe (6) is provided with a first liquid nitrogen valve (602), and the first liquid nitrogen valve (602) is connected to a liquid nitrogen input pump; The rear ports of the U-shaped tubes (8) are all provided with collecting tubes (701), the collecting tubes (701) are centrally connected to the discharge tubes (7), and the outer ports of the discharge tubes (7) are provided with liquid nitrogen outlet valves (702); The stirring assembly comprises a stirring motor (4) on the side wall of the mixing box (2), the side wall of the mixing box (2) is provided with a square opening, the outer wall of the stirring motor (4) and the inner wall of the square opening are connected by a sealing adhesive, and the output end of the stirring motor (4) is also provided with a stirring impeller; The recycling and reuse component comprises a standpipe (301) at the top of the storage box (3), a recycling box (302) is arranged at the top of the standpipe (301), and a pressure pump (5) is arranged on the side wall of the recycling box (302); The input end of the pressure pump (5) extends into the interior of the recovery box (302), the output end of the pressure pump (5) is provided with a return pipe (501), a recovery steel pipe (103) is provided on the rear side wall of the pressure box (1), and a pressure stabilizing valve is provided inside the recovery steel pipe (103). The end of the reflux pipe (501) is connected to the recovery steel pipe (103), and a heating component is provided on the recovery box (302).
2. The device for reducing viscosity of heavy oil using carbon dioxide based on multiphase flow mixing according to claim 1, characterized in that: A heat-conducting fin (801) is provided on the side wall of the U-shaped tube (8); the heat-conducting fin (801) is made of metal aluminum; and the thickness of the heat-conducting fin (801) is one millimeter.
3. The device for reducing viscosity of heavy oil using carbon dioxide based on multiphase flow mixing according to claim 1, characterized in that: The pressure control assembly comprises a first stop valve (202) and a second stop valve (204), wherein the first stop valve (202) is arranged at an inlet above the mixing box (2), and the second stop valve (204) is arranged at an outlet below the mixing box (2).
4. The device for reducing viscosity of heavy oil using carbon dioxide based on multiphase flow mixing according to claim 1, characterized in that: The heating component comprises an inner groove on the side wall of the recovery box (302), and an electric heating block is installed in the inner groove.
5. The device for reducing viscosity of heavy oil using carbon dioxide based on multiphase flow mixing according to claim 1, characterized in that: The material of the U-shaped tube (8) is high-speed steel, and a spiral groove is provided on the inner side wall of the U-shaped tube (8).