An unattended intelligent oil and gas mixed transmission system

Abstract

The present invention discloses an unattended intelligent oil and gas mixed transportation system, including a feed pipeline, a wax prevention and descaling device is arranged on the feed pipeline, the end of the feed pipeline is connected to the first oil and gas transportation system, the first oil and gas transportation system includes a transportation pipeline, a first control valve, a filter, an oil and gas mixed transportation pump, a one-way valve and a second control valve, and an electromagnetic heater is arranged on the discharge pipeline. The present invention is aimed at sites with low liquid production and high gas-oil ratio. Under the premise of meeting the functions that the site should have, the oil production of a single well can be directly transported out under low temperature conditions through an oil and gas mixed transportation pump and under the action of an electromagnetic heater, which completely simplifies the processing flow of the transfer station, optimizes the gathering and transportation system, abandons the associated gas pipeline network and the hot water circulation pipeline network, and stops the buffer tank and the heating furnace, which greatly reduces the operation risk of the site. At the same time, the oil and gas mixed transportation system can be automatically controlled by PLC, and can automatically complete the mixed transportation of oil and gas.

Description

Technical Field

[0001] The present invention relates to the field of oil and gas mixed transportation, and in particular to an unmanned intelligent oil and gas mixed transportation system. Background Art

[0002] In order to transport the crude oil collected from the oil field, it must be pressurized and then transported to the refinery through a pressure pipeline. However, since crude oil contains a large amount of associated gas, water, and sand, the transportation of crude oil is not simply liquid transportation, but the transportation of a multiphase mixture of liquid, gas, and solid.

[0003] At present, most of the domestic oil and gas mixed transportation systems adopt transfer stations or booster stations to collect the oil produced by a single well, heat it, separate it, boost it, and finally transport it to the pressure pipeline. The associated gas is compressed and then transported out through the associated gas pipeline network, and the oil mixture is transported out through another process through the oil pump. This kind of oil and gas mixed transportation system requires the establishment of associated gas pipeline network, oil transportation pipeline network, hot water circulation pipeline network, buffer tank and heating furnace, etc. The initial basic investment is huge, and it is necessary to build two external transmission pipelines for oil and associated gas. The process has many processing links and the boiler heating heat load is large. Moreover, after the oil is transported to the terminal, it is necessary to separate the oil, gas and solid before it can be used in the next process. Summary of the invention

[0004] The purpose of the present invention is to provide an unattended intelligent oil and gas mixed transportation system to solve the problems that the existing oil and gas mixed transportation system is complex, has many processing steps, and needs to build two external transmission pipelines for oil and associated gas.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention discloses an unattended intelligent oil and gas mixed transportation system, comprising a feed pipeline, on which a wax preventer and descaling device is provided, and the end of the feed pipeline is connected to a first oil and gas transportation system;

[0007] The first oil and gas transportation system includes a transportation pipeline connected to the end of the feed pipeline, and the transportation pipeline is provided with a first control valve, a filter, an oil and gas mixed transportation pump, a one-way valve and a second control valve in sequence according to the oil and gas transportation direction. The transportation pipelines on the inlet and outlet sides of the oil and gas mixed transportation pump are provided with a pressure transmitter and a mechanical pressure gauge, and the end of the transportation pipeline is connected to the outlet pipeline;

[0008] An electromagnetic heater is arranged on the discharge pipe.

[0009] Furthermore, the feed pipeline is provided with a feed control valve and a temperature transmitter in sequence according to the oil and gas transportation direction, and the temperature transmitter is located upstream of the anti-wax and descaling device.

[0010] Furthermore, the first oil and gas transportation system also includes two sewage pipes, which are respectively connected to the transportation pipes on the inlet and outlet sides of the oil and gas mixed transportation pump, and sewage stop valves are provided on the sewage pipes. Furthermore, it also includes a second oil and gas transportation system, which has the same structure as the first oil and gas transportation system, and the second oil and gas transportation system is connected in parallel with the first oil and gas transportation system between the feed pipe and the outlet pipe.

[0011] Furthermore, a discharge control valve is provided on the discharge pipe, and the discharge control valve is located upstream of the electromagnetic heater.

[0012] Furthermore, the feed pipeline is connected to a feed emergency pressure relief pipeline, the starting end of the feed emergency pressure relief pipeline is located between the feed control valve and the temperature transmitter, and the feed emergency pressure relief pipeline is provided with a feed emergency safety valve according to the oil and gas pressure relief direction;

[0013] The discharge pipeline is connected to a discharge emergency pressure relief pipeline, the starting end of the discharge emergency pressure relief pipeline is located downstream of the electromagnetic heater, and the discharge emergency pressure relief pipeline is provided with a discharge emergency safety valve according to the oil and gas pressure relief direction;

[0014] The ends of the feed emergency pressure relief pipeline and the discharge emergency pressure relief pipeline are connected to the main pressure relief pipeline, the main pressure relief pipeline is connected to the feed port of the emergency storage tank, and the main pressure relief pipeline is provided with an emergency pressure relief stop valve;

[0015] The discharge port of the emergency storage tank is connected to the feed pipe through an emergency feed pipe, the end of the emergency feed pipe is located between the temperature transmitter and the anti-wax and descaling device, and an emergency feed stop valve is provided on the emergency feed pipe.

[0016] Furthermore, the feed pipeline is connected to a spare feed emergency pressure relief pipeline, the starting end of the spare feed emergency pressure relief pipeline is located downstream of the anti-wax and scale remover, the end of the spare feed emergency pressure relief pipeline is connected to the main pressure relief pipeline, and the spare feed emergency pressure relief pipeline is provided with a spare emergency pressure relief electric valve.

[0017] Furthermore, it also includes a circulation pipeline, the circulation pipeline and the second oil and gas transportation system and the first oil and gas transportation system are connected in parallel between the feed pipeline and the discharge pipeline, and the circulation pipeline is provided with a circulation electric valve;

[0018] The filter is connected to a spare filter discharge pipe, the spare filter discharge pipe is located below the transport pipeline and is connected to the transport pipeline, and a spare filter discharge electric valve is arranged on the spare filter discharge pipe.

[0019] Compared with the prior art, the beneficial technical effects of the present invention are:

[0020] The present invention is aimed at sites with low liquid production and high gas-oil ratio. Under the premise of meeting the functions of the sites, the oil produced by single wells can be directly transported out under low temperature conditions through an oil and gas mixed transportation pump and under the action of an electromagnetic heater after being gathered, which completely changes the traditional oil and gas method, eliminates the intermediate oil and gas separation section, and directly transports the three-phase medium of oil, gas and water to the terminal for separation, optimizes the gathering and transportation system, abandons the associated gas pipeline network and hot water circulation pipeline network, and stops the buffer tank and heating furnace, greatly reducing the operation risk of the site. The system has two sets of identical oil and gas transportation pipelines, ensuring that one is started and the other is in standby under normal circumstances. At the same time, the oil and gas mixed transportation system can be automatically controlled by PLC, and can automatically complete the mixed transportation of oil and gas and the high-pressure early warning processing of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 A schematic diagram of the unattended intelligent oil and gas mixed transportation system of the present invention;

[0023] Figure 2 This is a schematic diagram of the installation and connection of the filter of the present invention;

[0024] Figure 3 It is the principle diagram of the control system of the present invention.

[0025] Description of the reference numerals: 1. Feed pipeline; 2. Feed control valve; 3. Temperature transmitter; 4. Wax preventer and descaling device; 5. First oil and gas transportation system; 501. Transportation pipeline; 502. First control valve; 503. Filter; 504. Oil and gas mixed pump; 505. Check valve; 506. Second control valve; 507. Pressure transmitter; 508. Mechanical pressure gauge; 6. Discharge pipeline; 7. Electromagnetic heater; 8. Drain pipeline; 9. Drain stop valve; 10. Second oil and gas transportation system; 11. Feed emergency pressure relief pipeline; 12. Feed emergency safety valve; 13. Discharge emergency pressure relief pipeline; 14. Discharge emergency safety valve; 15. Main pressure relief pipeline; 16. Emergency storage tank; 17. Emergency pressure relief stop valve; 18. Emergency feed pipeline; 19. Emergency feed stop valve; 20. Spare feed emergency pressure relief pipeline; 21. Spare emergency pressure relief electric valve; 22. Circulation pipeline; 23. Circulation electric valve; 24. Spare filter discharge pipe; 25. Spare filter discharge electric valve; 26. Discharge control valve. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] like Figures 1 to 2 As shown, in this embodiment, an unattended intelligent oil and gas mixed transportation system is disclosed, including a feed pipeline 1, on which a feed control valve 2, a temperature transmitter 3 and a wax preventer and descaling device 4 are sequentially arranged according to the oil and gas transportation direction, and the end of the feed pipeline 1 is connected to a first oil and gas transportation system 5; the first oil and gas transportation system 5 includes a transportation pipeline 501 connected to the end of the feed pipeline 1, and the transportation pipeline 501 is sequentially provided with a first control valve 502, a filter 503, an oil and gas mixed transportation pump 504, a one-way valve 505 and a second control valve 506 according to the oil and gas transportation direction, and the transportation pipeline 501 on the inlet and outlet sides of the oil and gas mixed transportation pump 504 is provided with a pressure transmitter 507 and a mechanical pressure gauge 508, and the end of the transportation pipeline 501 is connected to the discharge pipeline 6; the discharge pipeline 6 is provided with an electromagnetic heater 7. The pressure transmitter 507 and the mechanical pressure gauge 508 need to be used together with the stop valve when in use and installation, so as to facilitate their later maintenance.

[0028] The temperature transmitter 3 converts the signal of the temperature sensor into a current signal, which is connected to the secondary instrument to display the corresponding temperature. The temperature transmitter 3 is used to monitor the change of the oil and gas temperature in the feed pipeline 1 and feed the signal back to the control room. The pressure transmitter 507 is used to monitor the pressure change of the oil and gas in the transportation pipeline 501, and feed the signal back to the control room. The control room comprehensively controls the operating frequency of the oil and gas mixed transportation pump 504 according to the temperature and pressure signals of the oil and gas. The electromagnetic heater 7 is used to heat the crude oil in the oil and gas, so that the crude oil becomes diluted, the crude oil transmission pressure is reduced, and a reasonable temperature rise is provided. This oil and gas mixed transportation system removes the intermediate oil and gas separation section. After the transportation function of the first oil and gas transportation system 5, the oil and gas are transported through the discharge pipeline 6 to directly transport the three-phase medium of oil, gas and water to the terminal for separation. The terminal equipment does not need to be modified, which greatly simplifies the layout of the oil and gas transportation pipeline network.

[0029] It should be noted that crude oil is a mixture of various hydrocarbons with complex components and is also a diamagnetic material. When crude oil passes through a magnetic field with a sufficiently large magnetic field strength and gradient, due to the effect of the Lorentz force, the wax molecules in disordered thermal motion near the crystallization temperature gain energy, adjust the magnetic collision orientations of each other, and provide universal crystallization nucleation conditions, thereby generating a large number of microcrystals with very small diameters and in a spherical shape suspended in the crude oil. The anti-wax descaling device 4 can prevent the generation of crystalline wax in crude oil. The anti-wax descaling device 4 can change the electrostatic potential of the contacted fluid, thereby changing the binding force field between various material molecules in the fluid, making the solid phase particles in a suspended and dispersed state, inhibiting the formation of wax, scale and corrosion, making the wax and colloidal substances in the crude oil in a suspended state, not easy to aggregate and adsorb on the pipe wall, making various ions and impurities in the liquid phase not easy to combine to form scale, and can make the scale that has been formed fall off. The anti-wax descaling device 4 belongs to the prior art, and the technicians in this field can fully implement it. The structure and principle of the anti-wax descaling device 4 will not be repeated here.

[0030] The oil and gas extracted from the well will be mixed with mineral impurities such as sand, which may cause the transportation system to malfunction. Therefore, the first oil and gas transportation system 5 also includes two sewage pipes 8, which are respectively connected to the transportation pipes 501 on the inlet and outlet sides of the oil and gas mixed transport pump 504. A sewage stop valve 9 is provided on the sewage pipes 8, and each sewage pipe 8 is connected to the sewage pool after merging. It should be noted that when discharging sewage, the feed control valve 2 and the control valve on the outlet pipe 6 need to be closed, and the oil and gas mixed transport pump 504 stops working to discharge the oil and gas in the entire system.

[0031] In order to make the system operate continuously and prevent the first oil and gas transportation system 5 from malfunctioning, the system further includes a second oil and gas transportation system 10. The second oil and gas transportation system 10 has the same structure as the first oil and gas transportation system 5, and the second oil and gas transportation system 10 and the first oil and gas transportation system 5 are connected in parallel between the feed pipe 1 and the discharge pipe 6. The first oil and gas transportation system 5 and the second oil and gas transportation system 10 can work in rotation, so that one of the transportation systems can be easily repaired.

[0032] In order to isolate the discharge pipeline 6 from the first oil and gas transportation system 5 and the second oil and gas transportation system 10 and facilitate the inspection and maintenance of the discharge pipeline 6 , a discharge control valve 26 is provided on the discharge pipeline 6 , and the discharge control valve 26 is located upstream of the electromagnetic heater 7 .

[0033] In order to prevent the oil pressure in the feed pipeline 1 from being too high, a feed emergency pressure relief pipeline 11 is connected to the feed pipeline 1. The starting end of the feed emergency pressure relief pipeline 11 is located between the feed control valve 2 and the temperature transmitter 3. The feed emergency pressure relief pipeline 11 is provided with a feed emergency safety valve 12 according to the oil and gas pressure relief direction; the feed emergency safety valve 12 needs to be used together with a stop valve during use and installation, and stop valves are provided on both sides of the feed emergency safety valve 12 to facilitate its later maintenance.

[0034] In order to prevent the oil pressure in the discharge pipe 6 from being too high, a discharge emergency pressure relief pipe 13 is connected to the discharge pipe 6. The starting end of the discharge emergency pressure relief pipe 13 is located downstream of the electromagnetic heater 7. The discharge emergency pressure relief pipe 13 is provided with a discharge emergency safety valve 14 according to the oil and gas pressure relief direction; the discharge emergency safety valve 14 needs to be used together with a stop valve during use and installation, and stop valves are provided on both sides of the feed emergency safety valve 12 to facilitate its later maintenance.

[0035] The end of the feed emergency pressure relief pipe 11 and the end of the discharge emergency pressure relief pipe 13 are connected to the main pressure relief pipe 15, the main pressure relief pipe 15 is connected to the feed port of the emergency storage tank 16, and the main pressure relief pipe 15 is provided with an emergency pressure relief stop valve 17; the discharge port of the emergency storage tank 16 is connected to the feed pipe 1 through the emergency supply pipe 18, the end of the emergency supply pipe 18 is located between the temperature transmitter 3 and the anti-wax descaling device 4, and the emergency supply pipe 18 is provided with an emergency supply stop valve 19.

[0036] During actual transportation, the probability of overpressure in the feed pipeline 1 is much greater than that in the discharge pipeline 6. Therefore, a spare feed emergency pressure relief pipeline 20 is connected to the feed pipeline 1. The starting end of the spare feed emergency pressure relief pipeline 20 is located downstream of the anti-wax and scale remover 4, and the end of the spare feed emergency pressure relief pipeline 20 is connected to the main pressure relief pipeline 15. A spare emergency pressure relief electric valve 21 is provided on the spare feed emergency pressure relief pipeline 20.

[0037] When the associated gas in the transport pipeline 501 suddenly increases and far exceeds the transport upper limit of the oil and gas mixed transport pump 504, the oil and gas mixed transport pump 504 will produce a gas lock phenomenon, which reduces the displacement of the oil and gas mixed transport pump 504. In order to remove the gas in the oil and gas mixed transport pump 504, the system also includes a circulation pipeline 22. The circulation pipeline 22 is connected in parallel with the second oil and gas transportation system 10 and the first oil and gas transportation system 5 between the feed pipeline 1 and the discharge pipeline 6. A circulation electric valve 23 is provided on the circulation pipeline 22; a spare filter discharge pipe 24 is connected to the filter 503, and the spare filter discharge pipe 24 is located below the transport pipeline 501 and is connected to the transport pipeline 501. A spare filter discharge electric valve 25 is provided on the spare filter discharge pipe 24.

[0038] The exhaust process is as follows: during the oil and gas production process, the content of associated gas will occasionally increase at a certain production stage and exceed the transportation capacity of the oil and gas mixed pump 504. The pressure transmitters 507 located on both sides of the oil and gas mixed pump 504 detect the pressure in the transportation pipeline 501. Specifically, the pressure detected by the pressure transmitter 507 on the discharge side of the oil and gas mixed pump 504 decreases, and the pressure detected by the pressure transmitter 507 on the feed side of the oil and gas mixed pump 504 increases. At this time, the spare filter discharge electric valve 25 is actuated. Since the spare filter discharge pipe 24 is located below the transportation pipeline 501, pure oil will pass through the spare filter discharge pipe 24 first. The pure oil will be added to the transportation pipeline 501 to reduce the content of associated gas in the system. If the above operation cannot relieve the gas lock phenomenon, the circulation electric valve 23 starts to operate intermittently, and the oil and gas containing gas circulate and pass through the filter 503 again. At this time, the associated gas is stored in the filter 503. It should be noted that, due to the high pressure on the discharge pipe 6, when the circulation electric valve 23 is opened instantly, the oil and gas containing gas will preferentially pass through the circulation pipe 22. The associated gas is only temporarily stored in the filter 503. With the transportation of the oil and gas mixed pump 504, the associated gas will be gradually transported out, and the associated gas stored in the filter 503 will return to normal. If the above operation still cannot eliminate the gas lock phenomenon, the standby emergency pressure relief electric valve 21 is controlled to operate at this time, and the excess oil and gas, especially the associated gas, will flow to the emergency storage tank 16 through the standby feed emergency pressure relief pipe 20.

[0039] like Figure 3 As shown, the temperature transmitter 3 and the pressure transmitter 507 on the inlet and outlet sides of the oil and gas mixed transportation system are used to collect relevant data in the pipeline, and transmit the collected data to the PLC controller in the control room, and the PLC controller controls the actions of the oil and gas mixed transportation pump 504, the spare filter discharge electric valve 25, the circulation electric valve 23 and the spare emergency pressure relief electric valve 21. The system is automatically controlled by the PLC controller, and the system can automatically realize the operation of three working conditions. The first is to realize the switching operation of the first oil and gas transportation system 5 and the second oil and gas transportation system 10 to ensure that one is started and one is on standby under normal circumstances; the second is to eliminate the gas lock phenomenon of the oil and gas mixed transportation pump 504; the third is to eliminate the abnormal pressure increase in the feed pipeline 1. The system is controlled by PLC, which is not necessary for the problem to be solved by the technical solution. PLC is a preferred way to control the system.

[0040] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An unattended intelligent oil and gas mixed transportation system, characterized by: It comprises a feed pipeline (1), on which a wax preventer and descaling device (4) is provided, and the end of the feed pipeline (1) is connected to a first oil and gas transportation system (5); The first oil and gas transportation system (5) comprises a transportation pipeline (501) connected to the end of the feed pipeline (1); the transportation pipeline (501) is provided with a first control valve (502), a filter (503), an oil and gas mixed transportation pump (504), a non-return valve (505) and a second control valve (506) in sequence according to the oil and gas transportation direction; the transportation pipeline (501) is provided with a pressure transmitter (507) and a mechanical pressure gauge (508) on the inlet and outlet sides of the oil and gas mixed transportation pump (504); and the end of the transportation pipeline (501) is connected to the outlet pipeline (6); The discharge pipe (6) is provided with an electromagnetic heater (7); The invention also comprises a second oil and gas transportation system (10), wherein the second oil and gas transportation system (10) has the same structure as the first oil and gas transportation system (5), and the second oil and gas transportation system (10) and the first oil and gas transportation system (5) are connected in parallel between the feed pipeline (1) and the discharge pipeline (6); It also comprises a circulation pipeline (22), the circulation pipeline (22) being connected in parallel with the second oil and gas transportation system (10) and the first oil and gas transportation system (5) between the feed pipeline (1) and the discharge pipeline (6), and the circulation pipeline (22) being provided with a circulation electric valve (23); the filter (503) being connected with a spare filter discharge pipe (24), the spare filter discharge pipe (24) being located below the transportation pipeline (501) and connected to the transportation pipeline (501), and the spare filter discharge pipe (24) being provided with a spare filter discharge electric valve (25); The feed pipe (1) is connected to a spare feed emergency pressure relief pipe (20), the starting end of the spare feed emergency pressure relief pipe (20) is located downstream of the wax preventer and descaling device (4), the end of the spare feed emergency pressure relief pipe (20) is connected to the main pressure relief pipe (15), and the spare feed emergency pressure relief pipe (20) is provided with a spare emergency pressure relief electric valve (21); The exhaust process is as follows: during the oil and gas production process, the content of associated gas at a certain production stage will occasionally increase and exceed the transportation capacity of the oil and gas mixed transport pump (504). The pressure transmitters (507) located on both sides of the oil and gas mixed transport pump (504) detect the pressure in the transport pipeline (501). The pressure detected by the pressure transmitter (507) on the discharge side of the oil and gas mixed transport pump (504) decreases, and the pressure detected by the pressure transmitter (507) on the feed side of the oil and gas mixed transport pump (504) increases. At this time, the standby filter discharge electric valve (25) is actuated. Since the standby filter discharge pipe (24) is located below the transport pipeline (501), pure oil passes through the standby filter discharge pipe (24) first, and pure oil is added to the transport pipeline (501) to reduce the system pressure. The content of associated gas in the system. If the above exhaust process cannot eliminate the gas lock phenomenon, the circulation electric valve (23) starts to operate intermittently. Due to the high pressure on the discharge pipeline (6), when the circulation electric valve (23) is instantly opened, the oil and gas containing gas preferentially pass through the circulation pipeline (22); the oil and gas containing gas circulate and pass through the filter (503) again. At this time, the associated gas is stored in the filter (503). With the transportation of the oil and gas mixed transport pump (504), the associated gas will be gradually transported out, and the associated gas stored in the filter (503) returns to normal; if the above operation still cannot eliminate the gas lock phenomenon, the standby emergency pressure relief electric valve (21) is controlled to operate, and the excess oil and gas flows to the emergency storage tank (16) through the standby feed emergency pressure relief pipeline (20); The feed pipeline (1) is connected to a feed emergency pressure relief pipeline (11), the starting end of the feed emergency pressure relief pipeline (11) is located between the feed control valve (2) and the temperature transmitter (3), and the feed emergency pressure relief pipeline (11) is provided with a feed emergency safety valve (12) in the oil and gas pressure relief direction; The discharge pipe (6) is connected to a discharge emergency pressure relief pipe (13), the starting end of the discharge emergency pressure relief pipe (13) is located downstream of the electromagnetic heater (7), and the discharge emergency pressure relief pipe (13) is provided with a discharge emergency safety valve (14) in the oil and gas pressure relief direction; The end of the feed emergency pressure relief pipeline (11) and the end of the discharge emergency pressure relief pipeline (13) are connected to the main pressure relief pipeline (15), and the main pressure relief pipeline (15) is connected to the feed port of the emergency storage tank (16). The main pressure relief pipeline (15) is provided with an emergency pressure relief stop valve (17); The discharge port of the emergency storage tank (16) is connected to the feed pipe (1) via an emergency feed pipe (18), the end of the emergency feed pipe (18) is located between the temperature transmitter (3) and the anti-wax descaling device (4), and an emergency feed stop valve (19) is provided on the emergency feed pipe (18).

2. The unattended intelligent oil and gas mixed transportation system according to claim 1 is characterized by: The feed pipeline (1) is provided with a feed control valve (2) and a temperature transmitter (3) in sequence according to the oil and gas transportation direction. The temperature transmitter (3) is located upstream of the anti-wax and descaling device (4).

3. The unattended intelligent oil and gas mixed transportation system according to claim 1 is characterized in that: The first oil and gas transportation system (5) further comprises two sewage pipes (8), the two sewage pipes (8) being respectively connected to the transportation pipe (501) at the inlet and outlet sides of the oil and gas mixed transportation pump (504), and sewage stop valves (9) are provided on the sewage pipes (8).

4. The unattended intelligent oil and gas mixed transportation system according to claim 1 is characterized by: The discharge pipe (6) is provided with a discharge control valve (26), and the discharge control valve (26) is located upstream of the electromagnetic heater (7).

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