Double-coupling gas-liquid mixed transportation device and control method thereof

Abstract

The invention relates to the technical field of oil and gas conveying, and particularly discloses a double-coupling gas-liquid mixed conveying device and a control method thereof.The double-coupling gas-liquid mixed conveying device comprises a medium input header pipe and a medium output header pipe, and the medium input header pipe and the medium output header pipe are connected to a conveying pipeline of oil well produced media in series; the first buffer tank and the second buffer tank are connected in parallel between the medium input header pipe and the medium output header pipe; the reversing mechanism is installed between the first buffer tank and the second buffer tank, medium guide ports are formed in the first buffer tank and the second buffer tank, and the two ends of the reversing mechanism are connected with the medium guide port of the first buffer tank and the medium guide port of the second buffer tank respectively; electrical components of the double-coupling gas-liquid mixed transportation device are all connected with the automatic controller. According to the invention, the construction cost is saved, the construction period is shortened, the occupied area of the oil and gas transmission station is reduced, the use is simple, and the occurrence rate of risk accidents is reduced.

Description

Technical Field

[0001] This invention relates to the field of oil and gas transportation technology, and in particular to a dual-coupled gas-liquid mixed transportation device and its control method. Background Technology

[0002] The medium extracted from underground in oil and gas field development is usually a gas-liquid-solid mixed phase, which mainly includes heavy oil, light oil, water, natural gas, mud and sand.

[0003] Traditional transportation technology involves gas-liquid separation. The disadvantages of this method include the need to construct transfer and booster stations, as well as multiple pipelines to transport the separated oil, water, and natural gas, or oil-water and natural gas. The construction of transfer stations and multiple pipelines involves significant investment, long construction periods, and large land areas. Furthermore, it requires numerous and complex equipment and facilities, a large workforce, many safety control points, and poses significant risks.

[0004] In recent years, a new method of oil and gas transportation has emerged, which involves transporting oil, gas, and water together under pressure from the wellhead to the centralized processing station without separation or distribution during the transportation process. This method saves investment, allows for faster construction, reduces management difficulty, and minimizes safety risks, providing strong technical support for improving the quality, efficiency, and safety of oil and gas field production.

[0005] Existing technology discloses a dual-chamber liquid reciprocating drive multiphase flow mixing method and apparatus, application number 201811286148.0. This method utilizes a vacuum suction chamber and a compression discharge chamber alternately formed by two tanks as the suction and discharge chambers of a multiphase flow mixing pump. After separation within the tanks, the gas in the liquid-gas mixture is compressed and discharged outside. The power pump always operates in pure liquid conditions, eliminating the impact of high gas content on the pump. By employing a dual-chamber reciprocating cycle and using a centrifugal pump as power, multiphase flow mixing and transportation can be achieved. It can even operate continuously as a water-based hydraulic piston compressor. However, this technology uses a control system to control the opening and closing of solenoid valves to switch the suction and discharge ports of the power pump. Frequent opening of the solenoid valves can easily damage the valve body and equipment in the switching mechanism. This results in high initial manufacturing and subsequent operation and maintenance costs. Frequent failure of the solenoid valves can cause the mixing and transportation device to shut down, severely impacting on-site oil and gas production.

[0006] Therefore, it is necessary to propose an improvement to overcome the shortcomings of the existing technology. Summary of the Invention

[0007] The purpose of this invention is to solve the problems in the prior art and provide a dual-coupled gas-liquid mixed transportation device and its control method, which solves the problems of large investment, long construction period, large land occupation, complex use, large number of laborers, many safety control points and high risks in the construction of existing oil and gas transportation equipment.

[0008] The technical solution of this invention is: A dual-coupling gas-liquid mixing and transport device, comprising: The medium input main pipe and the medium output main pipe are connected in series in the pipeline for transporting the produced medium from the oil well; The first buffer tank and the second buffer tank are connected in parallel between the medium input main pipe and the medium output main pipe; A reversing mechanism is installed between the first buffer tank and the second buffer tank. Both the first and second buffer tanks have medium guide ports. The two ends of the reversing mechanism are connected to the medium guide ports of the first and second buffer tanks, respectively. The reversing mechanism is used to transport the oil and gas produced medium between the first and second buffer tanks, realizing the alternating operation of the intake and discharge of the oil and gas produced medium between the first and second buffer tanks. The automatic controller is equipped with a PLC automatic control system, and all electrical components of the dual-coupled gas-liquid mixing and conveying device are connected to the automatic controller.

[0009] As a preferred technical solution, the reversing mechanism includes a first reversing mechanism, which includes a first coupler, a second coupler, a first power pump, a second power pump, and a bidirectional motor. The first power pump and the second power pump are respectively located on both sides of the bidirectional motor. The first coupler is located between the first power pump and the bidirectional motor, and the second coupler is located between the second power pump and the bidirectional motor. The input end of the first power pump is connected to the medium guide port of the first buffer tank, the input end of the second power pump is connected to the medium guide port of the second buffer tank, and the output end of the first power pump is connected to the output end of the second power pump.

[0010] As a preferred technical solution, the reversing mechanism includes a second reversing mechanism, which includes a first drive motor, a second drive motor, a first coupler, a second coupler, a first power pump, and a second power pump. The first power pump is located at the output end of the first drive motor, the first coupler is located between the first power pump and the first drive motor, and the input end of the first power pump is connected to the medium guide port of the first buffer tank. The second power pump is located at the output end of the second drive motor, the second coupler is located between the second power pump and the second drive motor, the input end of the second power pump is connected to the medium guide port of the second buffer tank, and the output ends of the first power pump and the second power pump are connected.

[0011] As a preferred technical solution, both the first buffer tank and the second buffer tank are provided with a medium inlet and a medium outlet. A first input check valve is installed on the medium inlet pipe of the first buffer tank, and a first output check valve is installed on the medium outlet pipe of the first buffer tank. A second input check valve is installed on the medium inlet pipe of the second buffer tank, and a second output check valve is installed on the medium outlet pipe of the second buffer tank.

[0012] As a preferred technical solution, the media inlet of the first buffer tank and the media inlet of the second buffer tank are both connected to the media inlet manifold, and the media outlet of the first buffer tank and the media outlet of the second buffer tank are both connected to the media outlet manifold.

[0013] As a preferred technical solution, the first buffer tank is equipped with a first level gauge, and the second buffer tank is equipped with a second level gauge.

[0014] As a preferred technical solution, the first buffer tank is provided with a first safety valve, and the second buffer tank is provided with a second safety valve.

[0015] As a preferred technical solution, it also includes a drain pipe. Both the first buffer tank and the second buffer tank are provided with drain ports. The drain ports of the first buffer tank and the second buffer tank are connected to the drain pipe. The output end of the drain pipe is connected to the media output main pipe. A first drain check valve is installed on the drain port end pipe of the first buffer tank, and a second drain check valve is installed on the drain port end pipe of the second buffer tank. A drain control valve is installed on the drain pipe.

[0016] A control method based on a dual-coupled gas-liquid mixing transport device includes the following steps: Step 1: Medium input. The oil and gas produced medium is input into the first buffer tank and the second buffer tank through the medium input main pipe, the first input check valve, the second input check valve and the medium input port respectively. The gas in the first buffer tank and the second buffer tank is discharged through the medium output port, the first output check valve, the second output check valve and the medium output main pipe in sequence. Step 2: Liquid level monitoring. The first buffer tank and the second buffer tank are monitored by the first liquid level gauge and the second liquid level gauge, respectively. When the liquid level in the first buffer tank and the second buffer tank reaches the set height, the first liquid level gauge and the second liquid level gauge transmit signals to the automatic controller. The automatic controller receives the signals, processes them, and issues instructions. Step 3: Medium intake and discharge. The reversing mechanism opens, and driven by the motor and power pump of the reversing mechanism, the oil and gas extracted medium in the second buffer tank is transported to the first buffer tank through the reversing mechanism. The pressure inside the second buffer tank decreases, and the pressure inside the first buffer tank increases, driving the first input check valve and the second output check valve to close. The first output check valve and the second input check valve open, and the oil and gas extracted medium in the first buffer tank is discharged through the medium output main pipe. The second buffer tank is drawn in the oil and gas extracted medium through the medium input main pipe. Step 4: Medium intake and discharge. When the automatic controller detects that the liquid level in the second buffer tank has dropped to the designated position through the second level gauge, it issues a command to the reversing mechanism to perform a reversing operation. Driven by the motor and power pump of the reversing mechanism, the oil and gas extracted medium in the first buffer tank is transported to the second buffer tank through the reversing mechanism. The pressure inside the first buffer tank decreases, and the pressure inside the second buffer tank increases, driving the first output check valve and the second input check valve to close. The first input check valve and the second output check valve open, and the oil and gas extracted medium in the second buffer tank is discharged through the medium output main pipe. The oil and gas extracted medium in the first buffer tank is drawn in through the medium input main pipe. Step 5: Repeat. When the automatic controller detects that the liquid level in the first buffer tank has dropped to the designated position through the first liquid level gauge, the process repeats from step 2. The oil well produced medium is transferred back and forth between the first buffer tank and the second buffer tank. The first buffer tank and the second buffer tank alternately suck in and discharge, realizing the mixed transportation of the oil well produced medium.

[0017] As a preferred technical solution, the reversing mechanism controls the operation of the motor, the first coupler and the second coupler through the automatic controller. By controlling the alternating operation of the first coupler and the second coupler, it is used to control the start and stop of the first power pump and the second power pump, and to facilitate the reciprocating transmission of the oil well produced medium between the first buffer tank and the second buffer tank.

[0018] Compared with the prior art, the beneficial effects of the present invention are: The dual-coupling gas-liquid mixing transport device and control method of the present invention includes a medium input main pipe, a medium output main pipe, a first buffer tank, a second buffer tank, a reversing mechanism, and an automatic controller. The medium input main pipe and the medium output main pipe are connected in series on the transport pipeline for the oil well produced medium. The first buffer tank and the second buffer tank are connected in parallel between the medium input main pipe and the medium output main pipe. The reversing mechanism is installed between the first buffer tank and the second buffer tank for transporting the oil and gas produced medium between the first and second buffer tanks, achieving the purpose of alternating intake and discharge between the first and second buffer tanks. The automatic controller controls the switching of the electrical components of the overall device and controls the pressure inside the first and second buffer tanks, realizing the overall device's depressurized intake and pressurized discharge of the oil and gas produced medium, reducing the pressure at the oil well's liquid outlet and increasing the pressure in the output pipeline, thereby improving the transport efficiency of the oil well produced medium. This application achieves gas-liquid mixing and transportation through a reversing mechanism, a first buffer tank, a second buffer tank, and an automatic controller, which saves on the construction cost of oil and gas transportation stations, shortens the construction period, reduces the land area occupied by oil and gas transportation stations, is simple to use, reduces the number of workers and safety control points at transportation stations, and reduces the incidence of risk accidents. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the single-unit dual-coupling gas-liquid mixing and conveying device of the present invention; Figure 2 This is a schematic diagram of the structure of the dual-machine dual-coupling gas-liquid mixing and conveying device of the present invention.

[0020] The components include: 1. First input check valve; 2. First output check valve; 3. First safety valve; 4. First buffer tank; 5. First level gauge; 6. First drain check valve; 7. Second input check valve; 8. Second output check valve; 9. Second safety valve; 10. Second buffer tank; 11. Second level gauge; 12. Second drain check valve; 13. Medium output main pipe; 14. Medium input main pipe; 15. Outlet pressure gauge; 16. Inlet pressure gauge; 17. Drain control valve; 18. Drain pipe; 19. Automatic controller. A: First reversing mechanism; A20: Bidirectional motor; A21: Second coupler; A22: First power pump; A23: Second power pump; A24: First coupler; B, Second reversing mechanism; B201, First drive motor; B202, Second drive motor. Detailed Implementation

[0021] To make the technical means, technical features, inventive purpose and technical effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0022] Example 1: like Figure 1 The diagram shown is a structural schematic of the single-unit dual-coupling gas-liquid mixing and transport device of the present invention.

[0023] The single-unit dual-coupling gas-liquid mixing and transportation device of this embodiment includes a medium input main pipe 14, a medium output main pipe 13, a first buffer tank 4, a second buffer tank 10, a first reversing mechanism A, and an automatic controller 19. The medium input main pipe 14 and the medium output main pipe 13 are connected in series to the pipeline for transporting the produced medium from the oil well. The first buffer tank 4 and the second buffer tank 10 are installed in parallel between the medium input main pipe 14 and the medium output main pipe 13. Both the first buffer tank 4 and the second buffer tank 10 are provided with medium guide ports. The two ends of the first reversing mechanism A are respectively connected to the medium guide ports of the first buffer tank 4 and the second buffer tank 10, which are used for transporting the produced medium from the oil well between the first buffer tank 4 and the second buffer tank 10, thereby changing the internal pressure of the first buffer tank 4 and the second buffer tank 10, and realizing the purpose of pressure reduction for intake and pressure increase for discharge of the overall mixing and transportation device.

[0024] All electrical components of the present invention are connected to the automatic controller 19, which is equipped with a PLC automatic control system for automatic control of the overall mixing and conveying device.

[0025] The first reversing mechanism A includes a bidirectional motor A20, a first coupler A24, a second coupler A21, a first power pump A22, and a second power pump A23. The first power pump A22 and the second power pump A23 are respectively located at both ends of the bidirectional motor A20. The first coupler A24 is installed between the first power pump A22 and the bidirectional motor A20, and the second coupler A21 is installed between the second power pump A23 and the bidirectional motor A20. The input end of the first power pump A22 is connected to the medium guide port pipe of the first buffer tank 4, the input end of the second power pump A23 is connected to the medium guide port pipe of the second buffer tank 10, and the output end of the first power pump A22 is connected to the output end pipe of the second power pump A23.

[0026] During operation of the overall mixed-transport unit, the bidirectional motor A20 is normally open. The first coupler A24 and the second coupler A21 are alternately opened and closed by the automatic controller 19, thereby controlling the alternating operation of the first power pump A22 and the second power pump A23 to realize the medium transportation between the first buffer tank 4 and the second buffer tank 10. This is used to change the internal pressure of the first buffer tank 4 and the second buffer tank 10, improving the drawback of the existing technology that uses the valve body to control the reversing mechanism for reversing the transportation between the two tanks. With the motor in the normally open state, the operation of the power pumps is controlled by controlling the opening and closing of the coupler, avoiding equipment damage caused by frequent start-stop of the motor equipment and avoiding equipment shutdown caused by frequent valve body damage in the existing technology. This improves the operating efficiency of the gas-liquid mixed-transport unit, ensures the stable operation of the oil and gas field production and transportation system, and saves the later maintenance costs of the mixed-transport unit.

[0027] Both the first buffer tank 4 and the second buffer tank 10 are provided with a medium inlet and a medium outlet. A first input check valve 1 is installed on the medium inlet pipe of the first buffer tank 4, and a first output check valve 2 is installed on the medium outlet pipe of the first buffer tank 4. A second input check valve 7 is installed on the medium inlet pipe of the second buffer tank 10, and a second output check valve 8 is installed on the medium outlet pipe of the second buffer tank 10. The two input check valves and the two output check valves are automatically opened and closed by the pressure changes in the two buffer tanks, and together with the reversing mechanism, realize the suction and discharge operations of the first buffer tank 4 and the second buffer tank 10.

[0028] The first buffer tank 4 is equipped with a first level gauge 5, and the second buffer tank 10 is equipped with a second level gauge 11. The automatic controller 19 monitors the liquid level in the first buffer tank 4 and the second buffer tank 10 respectively through the level gauges, in order to coordinate the transportation of oil and gas media in the overall device.

[0029] The dual-coupling gas-liquid mixing device of the present invention also includes a drain pipe 18. Both the first buffer tank 4 and the second buffer tank 10 are provided with drain ports. The drain ports of the first buffer tank 4 and the second buffer tank 10 are connected to the drain pipe 18. A first drain check valve 6 is installed on the drain port end pipe of the first buffer tank 4, and a second drain check valve 12 is installed on the drain port pipe of the second buffer tank 10. A drain control valve 17 is installed on the drain pipe 18. The drain pipe 18 is connected to the medium output main pipe 13. When the mud and sand in the first buffer tank 4 and the second buffer tank 10 are discharged, a certain amount of crude oil is also included. The automatic controller 19 controls the discharge of the mud and sand and crude oil mixture in the tank through the valve body. The discharged material is transported to the medium output main pipe 13 through the drain pipe 18 and transported together with the oil well produced medium to the oil and gas processing terminal station for centralized processing.

[0030] An inlet pressure gauge 16 is installed at the inlet port of the medium input main pipe 14, and an outlet pressure gauge 15 is installed at the outlet port of the medium output main pipe 13. The inlet pressure gauge 16 and the outlet pressure gauge 15 are used to monitor the pressure inside the medium input main pipe 14 and the medium output main pipe 13, respectively. These two pressure values ​​are important bases for adjusting the pump speed of the mixing and conveying device and evaluating the pressure reduction and pressure increase effects of the mixing and conveying device.

[0031] Working principle: This device is usually installed near the wellhead of oil and gas wells, or at a node of the oil gathering branch or trunk line of an oil well, or at a node of the gas gathering branch or trunk line of a gas well. It can also replace the traditional surface engineering process for oil and gas fields with separate storage and distribution.

[0032] The first buffer tank 4 and the second buffer tank 10 are not limited to various tank types such as vertical tanks and horizontal tanks. The medium input main pipe 14 is connected to the oil and gas transportation pipeline upstream of the mixing and transportation device, and the medium output main pipe 13 is connected to the oil and gas transportation pipeline downstream of the mixing and transportation device. In order to optimize the operation of oil and gas well production and oil and gas field surface engineering transportation pipelines, the PLC automatic control system controls the reciprocating transportation of oil, gas and liquid in the first buffer tank 4 and the second buffer tank 10, thereby changing the internal pressure of the first buffer tank 4 or the second buffer tank 10 to achieve the operation of the device with depressurized intake and pressurized discharge.

[0033] Control method based on dual-coupled gas-liquid mixing transport device: Before the entire unit is manufactured and put into operation, both the first buffer tank 4 and the second buffer tank 10 are empty. First, the buffer tanks and their associated pipelines are filled with clean water to displace the air and serve as the initial circulating working fluid. During operation, the automatic controller 19 controls the operation of the first power pump A22 and the second power pump A23 to draw liquid from the first buffer tank 4 and the second buffer tank 10. A relative negative pressure is generated inside the buffer tanks, and oil and gas from the medium inlet are alternately drawn into the first buffer tank 4 and the second buffer tank 10. The oil, gas, and liquid automatically separate in the first and second buffer tanks 4 and 10, with the liquid located at the bottom and the gas at the top.

[0034] Automatic controller 19 controls the first coupler A24 to close, causing the first power pump A22 to engage with the bidirectional motor A20. The bidirectional motor A20 drives the first power pump A22 to run, and the first power pump A22 extracts the liquid in the first buffer tank 4 and delivers it to the second buffer tank 10. The pressure in the first buffer tank 4 decreases, and the pressure in the second buffer tank 10 increases. The first input check valve 1 and the second output check valve 8 open, and the first output check valve 2 and the second input check valve 7 close. The oil and gas well produced medium is drawn into the first buffer tank 4 through the medium input manifold 14. The gas in the second buffer tank 10 is first discharged through the medium output manifold 13, and then the oil and water are discharged through the medium output manifold 13.

[0035] When the first level gauge 5 detects that the liquid level in the first buffer tank 4 has dropped to the set height, the automatic controller 19 controls the first coupler A24 to disconnect, the first power pump A22 to separate from the bidirectional motor A20, and simultaneously controls the second coupler A21 to close, the second power pump A23 to engage with the bidirectional motor A20, and the bidirectional motor A20 to drive the second power pump A23 to run. The oil and water liquid is transported to the first buffer tank 4 through the second buffer tank 10 and the second power pump A23. The pressure in the first buffer tank 4 increases, and the pressure in the second buffer tank 10 decreases. The first input check valve 1 and the second output check valve 8 close, and the first output check valve 2 and the second input check valve 7 open. The gas in the first buffer tank 4 is first discharged through the medium output main pipe 13, and then the oil and water liquid is discharged. The oil, gas and liquid are drawn into the second buffer tank 10 through the medium input main pipe 14.

[0036] When the second level gauge 11 detects that the liquid level in the second buffer tank 10 has dropped to the set height, the automatic controller 19 controls the second coupler A21 to disconnect, the second power pump A23 to separate from the bidirectional motor A20, and simultaneously controls the first coupler A24 to close, the first power pump A22 to engage with the bidirectional motor A20, and the oil in the first buffer tank 4 is transported to the second buffer tank 10 again. Through the regulation of the automatic controller 19, the oil, gas and liquid are transported in a cycle. The two tanks realize the simultaneous intake and discharge of oil, gas and liquid, realize the pressure reduction at the end of the medium inlet pipe, improve the production efficiency of the oil and gas well, and at the same time increase the pressure at the end of the medium outlet pipe, improve the power and efficiency of gas-liquid mixing and transportation.

[0037] The automatic controller 19 adjusts the speed of the bidirectional motor A20 based on the pressure values ​​monitored by the inlet pressure gauge 16 and the outlet pressure gauge 15. When it is necessary to increase the pressure difference between the inlet pressure of the medium input manifold 14 and the outlet pressure of the medium output manifold 13, the speed of the bidirectional motor A20 is increased; when it is necessary to decrease the pressure difference between the inlet pressure of the medium input manifold 14 and the outlet pressure of the medium output manifold 13, the speed of the bidirectional motor A20 is decreased.

[0038] Example 2: The reversing mechanism adopts the second reversing mechanism B scheme. The difference between the second reversing mechanism B and the first reversing mechanism A is that the bidirectional motor A20 is replaced by a structure consisting of a first drive motor B201 and a second drive motor B202. The first power pump A22 is located at the output end of the first drive motor B201, and the second power pump A23 is located at the output end of the second drive motor B202. The first coupler A24 is located between the first power pump A22 and the first drive motor B201, and the second coupler A21 is located between the second power pump A23 and the second drive motor B202. In this embodiment, the first drive motor B201 and the second drive motor B202 are normally open during the operation of the overall device. The opening and closing of the first coupler A24 and the second coupler A21 are controlled by the automatic controller 19 to control the first power pump A22 and the second power pump A23, thereby realizing the medium transportation between the first buffer tank 4 and the second buffer tank 10, achieving the purpose of gas-liquid mixing transportation.

[0039] The dual-motor structure further ensures the safe operation of the overall mixed-transport unit, guaranteeing the safety and efficiency of oil well produced medium transportation.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. All equivalent changes and modifications made in accordance with the scope of the claims of this invention should fall within the technical scope of this invention.

Claims

1. A dual coupling gas-liquid mixed transport device, characterized in that, include: The medium input main pipe (14) and the medium output main pipe (13) are connected in series on the pipeline for transporting the produced medium from the oil well; The first buffer tank (4) and the second buffer tank (10) are connected in parallel between the media input main pipe (14) and the media output main pipe (13); A reversing mechanism is installed between the first buffer tank (4) and the second buffer tank (10). Both the first buffer tank (4) and the second buffer tank (10) are provided with medium guide ports. The two ends of the reversing mechanism are respectively connected to the medium guide ports of the first buffer tank (4) and the second buffer tank (10). The reversing mechanism is a first reversing mechanism (A). The first reversing mechanism (A) includes a first coupler (A24), a second coupler (A21), a first power pump (A22), a second power pump (A23), and a bidirectional motor (A20). The first power pump (A22) and the second power pump (A23) are respectively located on both sides of the bidirectional motor (A20). The first coupler (A24) is located between the first power pump (A22) and the bidirectional motor (A20). The second coupler (A21) is located between the second power pump (A23) and the bidirectional motor (A20). The input end of the first power pump (A22) is connected to the medium guide port of the first buffer tank (4). The input end of the second power pump (A23) is connected to the medium guide port of the second buffer tank (10). The output end of the first power pump (A22) is connected to the output end of the second power pump (A23). The automatic controller (19) is equipped with a PLC automatic control system. All electrical components of the dual-coupled gas-liquid mixing device are connected to the automatic controller (19).

2. The dual-coupled gas-liquid mixed-conveyance device according to claim 1, characterized by The reversing mechanism is a second reversing mechanism (B). The second reversing mechanism (B) includes a first drive motor (B201), a second drive motor (B202), a first coupler (A24), a second coupler (A21), a first power pump (A22), and a second power pump (A23). The first power pump (A22) is located at the output end of the first drive motor (B201), and the first coupler (A24) is located between the first power pump (A22) and the first drive motor (B201). The input end of the first power pump (A22) is connected to the medium guide port of the first buffer tank (4). The second power pump (A23) is located at the output end of the second drive motor (B202), and the second coupler (A21) is located between the second power pump (A23) and the second drive motor (B202). The input end of the second power pump (A23) is connected to the medium guide port of the second buffer tank (10), and the output end of the first power pump (A22) is connected to the output end of the second power pump (A23).

3. The dual-coupled gas-liquid mixed-conveyance device according to claim 1, characterized by Both the first buffer tank (4) and the second buffer tank (10) are provided with a medium inlet and a medium outlet. The first buffer tank (4) is equipped with a first input check valve (1) on the medium inlet pipe and a first output check valve (2) on the medium outlet pipe. The second buffer tank (10) is equipped with a second input check valve (7) on the medium inlet pipe and a second output check valve (8) on the medium outlet pipe.

4. The dual-coupled gas-liquid mixed-conveyance device according to claim 3, characterized by The media input port of the first buffer tank (4) and the media input port of the second buffer tank (10) are both connected to the media input manifold (14), and the media output port of the first buffer tank (4) and the media output port of the second buffer tank (10) are both connected to the media output manifold (13).

5. The dual-coupled gas-liquid mixed-conveyance device according to claim 1, characterized by The first buffer tank (4) is equipped with a first level gauge (5), and the second buffer tank (10) is equipped with a second level gauge (11).

6. The dual-coupled gas-liquid mixed-conveyance device according to claim 1, characterized by The first buffer tank (4) is provided with a first safety valve (3), and the second buffer tank (10) is provided with a second safety valve (9).

7. The dual-coupled gas-liquid mixed-conveyance device according to claim 1, characterized by It also includes a drain pipe (18), and both the first buffer tank (4) and the second buffer tank (10) are provided with drain ports. The drain ports of the first buffer tank (4) and the second buffer tank (10) are connected to the drain pipe (18). The output end of the drain pipe (18) is connected to the medium output main pipe (13). A first drain check valve (6) is installed on the drain port end pipe of the first buffer tank (4), and a second drain check valve (12) is installed on the drain port end pipe of the second buffer tank (10). A drain control valve (17) is installed on the drain pipe (18).

8. A control method based on a double-coupling gas-liquid mixed transport device, characterized in that, Includes the following steps: Step 1: Medium input. The oil and gas produced medium is input into the first buffer tank (4) and the second buffer tank (10) through the medium input main pipe (14), the first input check valve (1), the second input check valve (7) and the medium input port respectively. The gas in the first buffer tank (4) and the second buffer tank (10) is discharged in sequence through the medium output port, the first output check valve (2), the second output check valve (8) and the medium output main pipe (13). Step 2: Liquid level monitoring. The first buffer tank (4) and the second buffer tank (10) monitor the liquid level height in the tanks through the first liquid level gauge (5) and the second liquid level gauge (11) respectively. When the liquid level height in the first buffer tank (4) and the second buffer tank (10) reaches the set height, the first liquid level gauge (5) and the second liquid level gauge (11) respectively transmit signals to the automatic controller (19). The automatic controller (19) receives the signals, processes them, and issues instructions. Step 3: Medium intake and discharge. The reversing mechanism is opened. Driven by the motor and power pump of the reversing mechanism, the oil and gas extracted medium in the second buffer tank (10) is transported to the first buffer tank (4) through the reversing mechanism. The pressure inside the second buffer tank (10) decreases and the pressure inside the first buffer tank (4) increases. The first input check valve (1) and the second output check valve (8) are closed. The first output check valve (2) and the second input check valve (7) are opened. The oil and gas extracted medium in the first buffer tank (4) is discharged through the medium output main pipe (13). The second buffer tank (10) is sucked in the oil and gas extracted medium through the medium input main pipe (14). Step 4: Medium intake and discharge. When the automatic controller detects that the liquid level in the second buffer tank (10) drops to the specified position through the second liquid level gauge (11), it issues a command and the reversing mechanism performs a reversing operation. Driven by the motor and power pump of the reversing mechanism, the oil and gas extracted medium in the first buffer tank (4) is transported to the second buffer tank (10) through the reversing mechanism. The pressure inside the first buffer tank (4) decreases and the pressure inside the second buffer tank (10) increases, driving the first output check valve (2) and the second input check valve (7) to close. The first input check valve (1) and the second output check valve (8) open. The oil and gas extracted medium in the second buffer tank (10) is discharged through the medium output main pipe (13), and the first buffer tank (4) is sucked in the oil and gas extracted medium through the medium input main pipe (14). Step 5: Repeat. When the automatic controller (19) detects that the liquid level in the first buffer tank (4) drops to the specified position through the first liquid level gauge (5), the process repeats from step 2. The oil well produced medium is transferred back and forth between the first buffer tank (4) and the second buffer tank (10). The first buffer tank (4) and the second buffer tank (10) alternately suck in and discharge, thereby realizing the mixed transportation of the oil well produced medium.

9. The control method based on the double-coupling gas-liquid mixed-conveyance device according to claim 8, characterized by, The reversing mechanism controls the operation of the motor, the first coupler (A24) and the second coupler (A21) via the automatic controller (19). By controlling the alternating operation of the first coupler (A24) and the second coupler (A21), it is used to control the start and stop of the first power pump (A22) and the second power pump (A23), thereby realizing the reciprocating transmission of the oil well produced medium between the first buffer tank (4) and the second buffer tank (10).

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