Oil-gas mixed transmission gas-liquid ratio control device and control method

Abstract

The application discloses an oil-gas mixed transportation gas-liquid ratio control device, which comprises a device base, an input pipeline group fixed on the device base, a speed reducer motor, a double support pump, an output pipeline group, a backflow pipeline group, an accumulator and a control cabinet. The application also proposes an oil-gas mixed transportation gas-liquid ratio control method, which comprises the following steps: step one, building the oil-gas mixed transportation gas-liquid ratio control device and running; step two, regularly judging whether the temperature data detected by the temperature sensor on the double support pump is within the set threshold range; step three, backflow control: the controller controls the second stop valve to open, so that the liquid in the backflow temporary storage pipe enters the buffer pipe through the backflow outlet pipe; step four, when the temperature data returns to the threshold range, the controller controls the second stop valve to directly close or delay to close, and the backflow ends; and step five, regularly judging whether the liquid level data in the backflow temporary storage pipe is within the set threshold. The application can realize gas-liquid ratio control under the oil-gas mixed transportation condition.

Description

[Technical Field]

[0001] This invention relates to the technical field of oil and gas mixed transportation equipment for oil fields, and in particular to the technical field of gas-liquid ratio control devices and control methods for oil and gas mixed transportation. [Background Technology]

[0002] An oil well is a hole drilled according to the well layout system in an oilfield development plan for oil extraction. The passage through which oil rises from the bottom of the well to the wellhead is called an oil well. In oilfield development and transportation, one type of transportation is mixed oil and gas transport.

[0003] Oil pumped from oil wells contains gas, and the amount of this gas varies constantly. Pumps are needed for the mixed transport of oil and gas. Because the gas content in the oil is uncertain, it needs to be controlled. Without control, pumps are prone to burnout when there is too much gas, while they can operate normally when there is too little. Therefore, it is necessary to design a device and control method specifically for the mixed transport of oil and gas with a controllable gas-liquid ratio to adapt to different gas content conditions. [Summary of the Invention]

[0004] The purpose of this invention is to solve the problems in the prior art and to propose a gas-liquid ratio control device and method for oil-gas mixed transportation, which can realize gas-liquid ratio control in the case of oil wells transporting oil in oil-gas mixed transportation, thereby ensuring the stable long-term operation of pumps in the system.

[0005] To achieve the above objectives, this invention proposes an oil-gas mixed-transport gas-liquid ratio control device, comprising a device base and an input pipeline group, a reducer motor, a dual-support pump, an output pipeline group, a return pipeline group, an accumulator, and a control cabinet fixed on the device base. One end of the input pipeline group is connected to the oil well via an external pipeline through an inlet flange, and the other end is connected to the inlet below the dual-support pump. The output end of the reducer motor is mechanically connected to the input end of the dual-support pump. The outlet above the dual-support pump is connected to the output pipeline group, and the middle of the output pipeline group is connected to the input pipeline group via the return pipeline group. The output pipeline group outputs through an external pipeline connected to the outlet flange, and the outlet pipeline of the output pipeline group is connected to the accumulator via a pipeline. The control cabinet is electrically connected to the reducer motor, the dual-support pump, the output pipeline group, and the return pipeline group.

[0006] Preferably, the input pipeline assembly includes an inlet flange, a straight inlet pipe, a buffer pipe, a buffer outlet straight pipe, an arc-shaped inlet pipe, and an inlet housing. The straight inlet pipe is horizontally connected to the middle left side of the buffer pipe, and its end enters the oil well through an external pipeline connected to the inlet flange. The buffer outlet straight pipe is vertically connected to the bottom front side of the buffer pipe, and the lower end of the buffer outlet straight pipe is connected to the arc-shaped inlet pipe via a flange. The right end of the arc-shaped inlet pipe is connected to the inlet housing, and the upper outlet of the inlet housing is fixed relative to the inlet below the dual-support pump. The straight inlet pipe, the buffer outlet straight pipe, and the arc-shaped inlet pipe have equal diameters. The diameter of the buffer pipe is at least twice the diameter of the arc-shaped inlet pipe, and the center of the buffer pipe is higher than the center of the dual-support pump. An inlet baffle is horizontally embedded inside the inlet housing. The upper part of the inlet housing has two circular channels, each containing an inlet sleeve. The inlet baffle has two large through holes and a small vent hole. An inlet plug ball is installed between the through holes on the inlet baffle and the inlet sleeve.

[0007] Preferably, the output pipeline assembly includes an outlet housing, an elbow, a layered inlet straight pipe, a layered pipe, a pressure gauge, a layered outlet straight pipe, a clamp check valve, an outlet pipe, and an outlet flange. The lower end of the outlet housing is fixed to the upper outlet of the double-support pump. An elbow is connected to the upper rear side of the outlet housing. The elbow is vertically connected to the layered inlet straight pipe via a flange. The upper end of the layered inlet straight pipe is connected to the lower left end of the layered pipe. A pressure gauge is installed on the upper part of the layered pipe and connected to the control cabinet. The lower right end of the layered pipe is vertically connected to the layered outlet straight pipe. The upper end of the layered outlet straight pipe is higher on the left and lower on the right, with the upper part inserted into the inner cavity of the layered pipe. The lower end of the layered outlet straight pipe is connected to the outlet pipe via a flange. A clamp check valve is also installed between the lower end of the layered outlet straight pipe and the outlet pipe. The end of the outlet pipe is connected to an external pipeline via the outlet flange. An accumulator is connected to the outlet pipe via a pipeline.

[0008] The return pipeline assembly includes a return main pipe, an accumulator, a return riser pipe, a first shut-off valve, a return temporary storage pipe, a return outlet pipe, and a second shut-off valve. The return main pipe is vertically connected to the lower middle part of the layered pipe of the output pipeline assembly. The lower part of the return main pipe is connected to the middle right side of the return temporary storage pipe through the return riser pipe, and the first shut-off valve is installed in the return riser pipe. The lower left side of the return temporary storage pipe is connected to the upper part of the buffer pipe of the input pipeline assembly through the return outlet pipe, and the second shut-off valve is installed in the return outlet pipe. Both the first shut-off valve and the second shut-off valve are electrically connected to the control cabinet.

[0009] The elbow, layered inlet straight pipe, layered outlet straight pipe, and outlet pipe have equal diameters, and the outlet pipe's diameter is equal to the diameter of the straight inlet pipe of the input pipe assembly. The diameter of the layered pipe is at least three times the diameter of the layered inlet straight pipe, and the center of the layered pipe is higher than the center of the return storage pipe. The diameter of the return main pipe is smaller than the diameter of the layered outlet straight pipe, and the diameter of the return main pipe is at least four times the diameter of the return riser pipe. The diameter of the return riser pipe is equal to the diameter of the return outlet pipe, and the diameter of the return storage pipe is at least half the diameter of the buffer pipe. Two circular channels are provided below the outlet housing, and outlet sleeves are embedded within these channels. An outlet partition is provided laterally inside the outlet housing, and the outlet partition has two large circular through holes. An outlet plug ball is provided between the outlet sleeve and the circular through holes on the outlet partition.

[0010] This invention also proposes a method for controlling the gas-liquid ratio in oil-gas mixed transportation, comprising the following steps:

[0011] Step 1: Set up and operate the oil-gas mixed transportation gas-liquid ratio control device;

[0012] Step 2: Periodically check whether the temperature data detected by the temperature sensor on the dual-support pump is within the set threshold range: If the temperature data is within the threshold range, continue running and process the temperature data after a certain interval; if the temperature data exceeds the threshold range, the controller activates the reflux control and proceeds to Step 3.

[0013] Step 3: Reflux control: The controller controls the second shut-off valve to open, allowing the liquid in the reflux storage tube to enter the buffer tube through the reflux outlet tube;

[0014] Step 4: Once the temperature data returns to the threshold range, the controller will either directly close or delay closing the second shut-off valve, thus ending the reflux process.

[0015] Step 5: Periodically check whether the liquid level in the reflux storage tube is within the set threshold: If the liquid level is lower than the set threshold, the controller controls the opening of the first shut-off valve, and the liquid enters the reflux storage tube from the stratification tube; if the liquid level is higher than the set threshold, the controller controls the closing of the first shut-off valve.

[0016] The beneficial effects of this invention are as follows: The internal structure of the inlet housing, which allows for gas to pass through before liquid, ensures sufficient liquid in the incoming pipeline, reducing the possibility of pump burnout. The structure of the outlet housing allows gas to reach a certain pressure before entering the pipeline, ensuring smooth gas delivery. Backflow control within the mixed output pipeline assembly ensures stable and continuous pump operation even with high gas levels. The accumulator's buffering mechanism mitigates system disturbances caused by uneven gas flow.

[0017] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. [Attached Image Description]

[0018] Figure 1 This invention relates to a three-dimensional device for controlling the gas-liquid ratio in oil-gas mixed transportation and a control method. Figure 1 ;

[0019] Figure 2 This invention relates to a three-dimensional device for controlling the gas-liquid ratio in oil-gas mixed transportation and a control method. Figure 2 ;

[0020] Figure 3 This invention relates to a pipeline three-dimensional system of an oil-gas mixed transport gas-liquid ratio control device and control method. Figure 1 ;

[0021] Figure 4 This invention relates to a pipeline three-dimensional system of an oil-gas mixed transport gas-liquid ratio control device and control method. Figure 2 ;

[0022] Figure 5 This is a top view of the oil-gas mixed transport gas-liquid ratio control device and control method of the present invention;

[0023] Figure 6 This is the present invention. Figure 5 AA section view in the middle;

[0024] Figure 7 This is the present invention. Figure 5 BB cross-section diagram.

[0025] In the diagram: 1-Input piping assembly, 11-Inlet flange, 12-Straight inlet pipe, 13-Buffer pipe, 14-Buffer outlet straight pipe, 15-Arc-shaped inlet pipe, 16-Inlet housing, 1601-Inlet baffle, 1602-Inlet plug, 1603-Inlet sleeve, 2-Equipment base, 3-Reducer motor, 4-Double-support pump, 5-Output piping assembly, 51-Outlet housing, 5101-Outlet sleeve, 5102-Outlet plug. 5103-Outlet baffle, 52-Elbow, 53-Layered inlet straight pipe, 54-Layered pipe, 55-Pressure gauge, 56-Layered outlet straight pipe, 57-Clip check valve, 58-Outlet pipe, 59-Outlet flange, 6-Return pipe assembly, 61-Return main pipe, 62-Return riser pipe, 63-First shut-off valve, 64-Return temporary storage pipe, 65-Return outlet pipe, 66-Second shut-off valve, 7-Accumulator, 8-Control cabinet.

Detailed Implementation Methods

[0026] See Figures 1-7This invention includes a device base 2 and an input pipeline assembly 1, a reducer motor 3, a dual-support pump 4, an output pipeline assembly 5, a return pipeline assembly 6, an accumulator 7, and a control cabinet 8 fixed on the device base 2. One end of the input pipeline assembly 1 is connected to the oil well via an external pipeline through an inlet flange 11, and the other end is connected to the inlet below the dual-support pump 4. The output end of the reducer motor 3 is mechanically connected to the input end of the dual-support pump 4. The outlet above the dual-support pump 4 is connected to the output pipeline assembly 5. The middle part of the output pipeline assembly 5 is connected to the input pipeline assembly 1 via the return pipeline assembly 6. The output pipeline assembly 5 is connected to an external pipeline through an outlet flange 59. The outlet pipeline 59 of the output pipeline assembly 5 is connected to the accumulator 7 via a pipeline. The control cabinet 8 is electrically connected to the reducer motor 3, the dual-support pump 4, the output pipeline assembly 5, and the return pipeline assembly 6.

[0027] Specifically, the input pipeline assembly 1 includes an inlet flange 11, a straight inlet pipe 12, a buffer pipe 13, a buffer outlet straight pipe 14, an arc-shaped inlet pipe 15, and an inlet housing 16. The straight inlet pipe 12 is horizontally connected to the middle left side of the buffer pipe 13, and the end of the straight inlet pipe 12 enters the oil well through an external pipeline connected to the inlet flange 11. The buffer outlet straight pipe 14 is vertically connected to the bottom front side of the buffer pipe 13, and the lower end of the buffer outlet straight pipe 14 is connected to the arc-shaped inlet pipe 15 through a flange. The right end of the arc-shaped inlet pipe 15 is connected to the inlet housing 16, and the upper outlet of the inlet housing 16 is fixed relative to the inlet below the dual-support pump 4. The diameters of the straight inlet pipe 12, the buffer outlet straight pipe 14, and the arc-shaped inlet pipe 15 are equal, the diameter of the buffer pipe 13 is at least twice the diameter of the arc-shaped inlet pipe 15, and the center of the buffer pipe 13 is higher than the center of the dual-support pump 4. An inlet partition 1601 is horizontally embedded inside the inlet box 16. The upper part of the inlet box 16 is provided with two circular channels and an inlet sleeve 1603 is embedded in the circular channels. The inlet partition 1601 is provided with two large circular through holes and a small air hole. An inlet plug ball 1602 is provided between the circular through holes on the inlet partition 1601 and the inlet sleeve 1603.

[0028] Specifically, the output pipeline assembly 5 includes an outlet housing 51, an elbow 52, ​​a layered inlet straight pipe 53, a layered pipe 54, a pressure gauge 55, a layered outlet straight pipe 56, a clamp check valve 57, an outlet pipe 58, and an outlet flange 59. The lower end of the outlet housing 51 is fixed to the upper outlet of the double-support pump 4. An elbow 52 is connected to the upper rear side of the outlet housing 51. The elbow 52 is vertically connected to the layered inlet straight pipe 53 via a flange. The upper end of the layered inlet straight pipe 53 is connected to the lower left end of the layered pipe 54. 4. A pressure gauge 55 is installed on the upper part and connected to the control cabinet 8. The lower right end of the layered pipe 54 is vertically connected to the layered outlet straight pipe 56. The upper end of the layered outlet straight pipe 56 is higher on the left and lower on the right, and the upper part is inserted into the inner cavity of the layered pipe 54. The lower end of the layered outlet straight pipe 56 is connected to the outlet pipe 58 through a flange. A clamp check valve 57 is also installed between the lower end of the layered outlet straight pipe 56 and the outlet pipe 58. The end of the outlet pipe 58 is connected to the external pipeline through the outlet flange 59. An accumulator 7 is connected to the outlet pipe 58 through a pipeline.

[0029] The return pipeline assembly 6 includes a return main pipe 61, an accumulator 7, a return riser pipe 62, a first shut-off valve 63, a return temporary storage pipe 64, a return outlet pipe 65, and a second shut-off valve 66. The return main pipe 61 is vertically connected to the lower middle part of the layered pipe 54 of the output pipeline assembly 5. The lower part of the return main pipe 61 is connected to the middle right side of the return temporary storage pipe 64 through the return riser pipe 62. The first shut-off valve 63 is installed in the return riser pipe 62. The lower left side of the return temporary storage pipe 64 is connected to the upper part of the buffer pipe 13 of the input pipeline assembly 1 through the return outlet pipe 65. The second shut-off valve 66 is installed in the return outlet pipe 65. Both the first shut-off valve 63 and the second shut-off valve 66 are electrically connected to the control cabinet 8.

[0030] 1. The elbow 52, ​​the layered inlet straight pipe 53, the layered outlet straight pipe 56, and the outlet pipe 58 have equal diameters, and the diameter of the outlet pipe 58 is equal to the diameter of the straight inlet pipe 12 of the input pipe assembly 1; the diameter of the layered pipe 54 is at least three times the diameter of the layered inlet straight pipe 53, and the center of the layered pipe 54 is higher than the center of the return temporary storage pipe 64; the diameter of the return main pipe 61 is smaller than the diameter of the layered outlet straight pipe 56, and the diameter of the return main pipe 61 is at least four times the diameter of the return riser pipe 62, the diameter of the return riser pipe 62 is equal to the diameter of the return outlet pipe 65, and the diameter of the return temporary storage pipe 64 is at least half the diameter of the buffer pipe 13. The outlet box 51 has two circular channels at the bottom and an outlet sleeve 5101 is embedded in the circular channels. An outlet partition 5103 is provided horizontally inside the outlet box 51 and two large circular through holes are provided on the outlet partition 5103. An outlet plug ball 5102 is provided between the outlet sleeve 5101 and the circular through holes on the outlet partition 5103.

[0031] The present invention further includes the following steps:

[0032] Step 1: Set up and operate the oil-gas mixed transportation gas-liquid ratio control device;

[0033] Step 2: Periodically check whether the temperature data detected by the temperature sensor on the dual-support pump 4 is within the set threshold range: If the temperature data is within the threshold range, continue running and process the temperature data after a certain interval; if the temperature data exceeds the threshold range, the controller starts the reflux control and proceeds to Step 3.

[0034] Step 3: Reflux control: The controller controls the second shut-off valve 66 to open, so that the liquid in the reflux storage tube 64 enters the buffer tube 13 through the reflux outlet tube 65;

[0035] Step 4: Once the temperature data returns to the threshold range, the controller will directly or delay closing the second shut-off valve 66, ending the reflux.

[0036] Step 5: Periodically check whether the liquid level in the reflux storage tube 64 is within the set threshold: If the liquid level is lower than the set threshold, the controller controls the opening of the first shut-off valve 63, and the liquid enters the reflux storage tube 64 from the stratification tube 54; if the liquid level is higher than the set threshold, the controller controls the closing of the first shut-off valve 63.

[0037] The working process of this invention:

[0038] The working process of the oil-gas mixed transportation gas-liquid ratio control device and control method of the present invention is described in conjunction with the accompanying drawings.

[0039] Step 1: Construct and operate the oil-gas mixed transport gas-liquid ratio control device: Connect the pipeline from the oil well to the inlet flange 11 of the device. The inlet buffer pipe 13 can be used to temporarily store a certain amount of gas and liquid (it will separate into layers, with gas on top and liquid below). The buffer pipe 13 has a large diameter and is positioned high. Oil mixed with gas in the oil well is pumped up by the dual-support pump 4, and after passing through the pipeline of the mixed input pipeline assembly 1, it reaches the inlet housing 16. The dual-support pump 4 is supported partly by the inlet housing 16. The inlet plug 1602 of the inlet housing 16 can be opened, and gas and liquid escape from the side of the plug. When there is a lot of gas in the oil, the inlet vent 1605 in the middle of the inlet baffle 1601 can be drilled out; when there is a lot of liquid in the oil, the inlet plug 1602 will open. The structure of the inlet housing 16 has the characteristic of allowing gas to pass through first and then liquid to pass through, which can ensure that there is enough liquid in the incoming pipeline, reducing the possibility of the dual-support pump 4 burning out. The petroleum-liquid mixture enters through the inlet housing 16, passes through the dual-support pump 4, and then enters the outlet pipeline group 5. Most of the gas-liquid mixture is output from the outlet flange 59, while a small portion of the liquid flows into the return storage pipe 64 in the control cabinet 8 for replenishment when there is excessive gas. The outlet housing 51 is equipped with an outlet plug 5102; the gas needs to be compressed to a certain level before the outlet plug 5102 can be opened. When the gas and liquid mix, the gas is on top and the liquid is below. The gas needs to penetrate the pipeline, thus requiring a certain pressure. As for the liquid, the pressure is quickly increased by the operation of the dual-support pump 4. The space under the outlet plug 5102 is where the gas compression process takes place. The structure of the outlet housing 51 ensures that the gas has sufficient pressure before entering the pipeline for transport, guaranteeing smooth gas delivery within the pipeline. The stratification tube 54 is large enough that gas stratifies at the top, while liquid leaks directly down at the bottom. A portion of the liquid leaks into the main return pipe 61, then flows through the return riser pipe 62 into the return storage pipe 64. The diameter of the return riser pipe 62 is smaller than that of the main return pipe 61, which is smaller than that of the return storage pipe 64, which is smaller than that of the stratification tube 54. Furthermore, the center of the stratification tube 54 is higher than the center of the return storage pipe 64, ensuring that the return storage pipe 64 can store liquid. The center of the return storage pipe 64 is higher than the center of the buffer pipe 13, and the return storage pipe 64 is connected to the buffer pipe 13 via a very thin return outlet pipe 65. The first shut-off valve 63 and the second shut-off valve 66, respectively, on the return riser pipe 62 and the return outlet pipe 65, open and close under the control of the control cabinet 8, thereby activating the return function when needed.

[0040] Step 2: Periodically check whether the temperature data detected by the temperature sensor on the dual-support pump 4 is within the set threshold range: If the temperature data is within the threshold range, continue running and process the temperature data after a certain interval; if the temperature data exceeds the threshold range, the controller starts the reflux control and proceeds to Step 3.

[0041] Step 3: Reflux control: The controller controls the second shut-off valve 66 to open, so that the liquid in the reflux storage tube 64 enters the buffer tube 13 through the reflux outlet tube 65;

[0042] Step 4: Once the temperature data returns to the threshold range, the controller will directly or delay closing the second shut-off valve 66, ending the reflux.

[0043] Step 5: Periodically check whether the liquid level in the reflux storage tube 64 is within the set threshold: If the liquid level is lower than the set threshold, the controller controls the opening of the first shut-off valve 63, and the liquid enters the reflux storage tube 64 from the stratification tube 54; if the liquid level is higher than the set threshold, the controller controls the closing of the first shut-off valve 63.

[0044] A 1.6L accumulator 7 is installed at the outlet of the output pipeline group 5: the gas is undergoing different and continuous compression processes, and the gas content varies, resulting in intermittent movement; in order to eliminate the vibration caused by the change in gas-liquid ratio in the pipeline, the accumulator 7 can play a buffering role.

[0045] The system described in this application ensures continuous and normal operation of the equipment even when there is a large amount of gas in the oil well. The overall dimensions of the device in the embodiment provided in this application are 3 meters long, 2 meters wide, and 1.8 meters high. The pipe diameter can be determined according to the proportions in the accompanying drawings, or it can be adjusted appropriately. Theoretically, a larger pipe is better because gas-liquid separation has efficiency requirements, and a larger pipe can achieve better separation. The pipe material is a conventional existing material with no special requirements; the dual-support pump 4 is a conventional rotor pump with no special requirements.

[0046] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the scope of protection of the present invention.

Claims

1. A gas-liquid ratio control device for oil-gas mixed transportation, characterized in that: The device includes a base (2) and an input pipeline assembly (1) fixed on the base (2), a reducer motor (3), a double-support pump (4), an output pipeline assembly (5), a return pipeline assembly (6), an accumulator (7), and a control cabinet (8). One end of the input pipeline assembly (1) is connected to the oil well through an external pipeline via an inlet flange (11), and the other end is connected to the inlet below the double-support pump (4). The output end of the reducer motor (3) is mechanically connected to the input end of the double-support pump (4). The outlet above the double-support pump (4) is connected to the output pipeline assembly (8). The output pipeline group (5) is connected to the input pipeline group (1) through the return pipeline group (6) in the middle. The output pipeline group (5) is connected to the external pipeline through the outlet flange (59). The outlet pipeline (58) of the output pipeline group (5) is connected to the accumulator (7) through the pipeline. The control cabinet (8) is electrically connected to the reducer motor (3), the double support pump (4), the output pipeline group (5), the first shut-off valve (63) located on the return riser pipe (62), and the second shut-off valve (66) located on the return outlet pipe (65). The input pipeline assembly (1) includes an inlet housing (16), the upper outlet of the inlet housing (16) is fixed relative to the inlet below the double-support pump (4); an inlet partition (1601) is horizontally embedded inside the inlet housing (16), the upper part of the inlet housing (16) is provided with two circular channels and an inlet sleeve (1603) is embedded in the circular channels, the inlet partition (1601) is provided with two large circular through holes and a small air hole, and an inlet plug ball (1602) is provided between the circular through holes on the inlet partition (1601) and the inlet sleeve (1603). The output pipe assembly (5) includes an outlet box (51), a layered pipe (54), and an outlet pipe (58); the outlet box (51) is provided with an outlet partition (5103), and an outlet plug (5102) is provided between the outlet sleeve (5101) and the partition; the outlet box (51) has two circular channels below it and the outlet sleeve (5101) is embedded in the circular channels; the outlet box (51) has an outlet partition (5103) arranged horizontally inside it and the outlet partition (5103) has two large circular through holes; the outlet plug (5102) is provided between the outlet sleeve (5101) and the circular through holes on the outlet partition (5103). The return pipeline assembly (6) includes a return main pipe (61), a return temporary storage pipe (64), and a return outlet pipe (65). The return temporary storage pipe (64) is connected to the buffer pipe (13) through the return outlet pipe (65). The lower part of the return main pipe (61) is connected to the middle right side of the return temporary storage pipe (64) through the return riser pipe (62). A second shut-off valve (66) is installed in the return outlet pipe (65).

2. The oil-gas mixed transport gas-liquid ratio control device as described in claim 1, characterized in that: The input pipeline group (1) also includes an inlet flange (11), a straight inlet pipe (12), a buffer pipe (13), a buffer outlet straight pipe (14), and an arc-shaped inlet pipe (15). The straight inlet pipe (12) is horizontally connected to the middle left side of the buffer pipe (13). The end of the straight inlet pipe (12) enters the oil well through the external pipeline of the inlet flange (11). The buffer outlet straight pipe (14) is vertically connected to the bottom front side of the buffer pipe (13). The lower end of the buffer outlet straight pipe (14) is connected to the arc-shaped inlet pipe (15) through a flange. The right end of the arc-shaped inlet pipe (15) is connected to the inlet box (16).

3. The oil-gas mixed transport gas-liquid ratio control device as described in claim 2, characterized in that: The diameters of the straight inlet pipe (12), the buffer outlet straight pipe (14), and the arc-shaped inlet pipe (15) are equal. The diameter of the buffer pipe (13) is at least twice the diameter of the arc-shaped inlet pipe (15), and the center of the buffer pipe (13) is higher than the center of the double-support pump (4).

4. The oil-gas mixed transport gas-liquid ratio control device as described in claim 1, characterized in that: The output pipeline assembly (5) also includes an elbow (52), a layered inlet straight pipe (53), a pressure gauge (55), a layered outlet straight pipe (56), a clamp check valve (57), and an outlet flange (59). The lower end of the outlet housing (51) is fixed to the upper outlet of the double-support pump (4). An elbow (52) is connected to the upper rear side of the outlet housing (51). The elbow (52) is vertically connected to the layered inlet straight pipe (53) through the flange. The upper end of the layered inlet straight pipe (53) is connected to the lower left side of the layered pipe (54). A pressure gauge (59) is installed on the upper part of the layered pipe (54). 5) The pressure gauge (55) is connected to the control cabinet (8). The lower right end of the layered pipe (54) is vertically connected to the layered outlet straight pipe (56). The upper end of the layered outlet straight pipe (56) is higher on the left and lower on the right, and the upper part is inserted into the inner cavity of the layered pipe (54). The lower end of the layered outlet straight pipe (56) is connected to the outlet pipe (58) through a flange. A clamp check valve (57) is also installed between the lower end of the layered outlet straight pipe (56) and the outlet pipe (58). The end of the outlet pipe (58) is connected to the external pipeline through the outlet flange (59). An accumulator (7) is connected to the outlet pipe (58) through a pipeline. The return pipeline group (6) also includes an accumulator (7), a return riser (62), a first shut-off valve (63), and a second shut-off valve (66). The middle lower end of the layered pipe (54) of the output pipeline group (5) is vertically inserted above the return main pipe (61). The first shut-off valve (63) is installed in the return riser (62). The lower left side of the return temporary storage pipe (64) is connected to the upper part of the buffer pipe (13) of the input pipeline group (1) through the return outlet pipe (65).

5. The oil-gas mixed transport gas-liquid ratio control device as described in claim 4, characterized in that: The elbow (52), the layered inlet straight pipe (53), the layered outlet straight pipe (56), and the outlet pipe (58) have the same diameter, and the diameter of the outlet pipe (58) is equal to the diameter of the straight inlet pipe (12) of the input pipe group (1); the diameter of the layered pipe (54) is at least three times the diameter of the layered inlet straight pipe (53), and the center of the layered pipe (54) is higher than the center of the return storage pipe (64); the diameter of the return main pipe (61) is smaller than the diameter of the layered outlet straight pipe (56), and the diameter of the return main pipe (61) is at least four times the diameter of the return riser pipe (62), the diameter of the return riser pipe (62) is equal to the diameter of the return outlet pipe (65), and the diameter of the return storage pipe (64) is at least half the diameter of the buffer pipe (13).

6. A method for controlling the gas-liquid ratio in oil-gas mixed transportation, based on the apparatus of any one of claims 1-5, characterized in that: Includes the following steps: Step 1: Set up and operate the oil-gas mixed transportation gas-liquid ratio control device; Step 2: Periodically check whether the temperature data detected by the temperature sensor on the dual-support pump (4) is within the set threshold range: if the temperature data is within the threshold range, continue to run and process the temperature data after a certain interval; if the temperature data exceeds the threshold range, the controller starts the reflux control and proceeds to Step 3. Step 3: Reflux control: The controller controls the second shut-off valve (66) to open, so that the liquid in the reflux storage tube (64) enters the buffer tube (13) through the reflux outlet tube (65); Step 4: When the temperature data returns to the threshold range, the controller directly or with a delay closes the second shut-off valve (66), and the reflux ends; Step 5: Periodically check whether the liquid level data in the reflux storage tube (64) is within the set threshold: If the liquid level data is lower than the set threshold, the controller controls the opening of the first shut-off valve (63), and the liquid enters the reflux storage tube (64) from the stratification tube (54); if the liquid level data is higher than the set threshold, the controller controls the closing of the first shut-off valve (63).

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