Wellhead fluid density reduction control device

Abstract

The application relates to the technical field of control devices, in particular to a fluid density control device for an oil extraction wellhead. The technical scheme comprises an oil conveying pipe, an oil inlet, an oil outlet, mounting frames, a reciprocating screw rod, a sliding block, a motor, a guide plate and sealing grooves. The oil inlet is arranged at one end of the oil conveying pipe, the oil outlet is arranged at the other end of the oil conveying pipe, the mounting frames are fixedly arranged at the two sides of the oil conveying pipe, the reciprocating screw rod is rotatably arranged on the mounting frames, the sliding block is slidably arranged on the mounting frames, the sliding block is in threaded connection with the reciprocating screw rod, the motor is fixedly arranged at one end of the mounting frame, the output shaft of the motor is fixedly connected with the reciprocating screw rod, the guide plate is hingedly arranged at one side of the reciprocating screw rod, and the sealing grooves are arranged at the two sides of the oil conveying pipe. The single power source is linked with the spherical gas conveying cavity to dynamically swing and spray gas and mechanically multi-stage micro-shear, so that the high dispersion micro-bubble mixing and high-efficiency density reduction of gas and oil media are realized.

Description

Technical Field

[0001] This invention relates to the field of control device technology, and in particular to a control device for reducing fluid density at the wellhead of an oil production well. Background Technology

[0002] In oil extraction, the density of the fluid at the wellhead directly affects the wellhead's suspended load, back pressure, and fluid flowability. Especially in the extraction of crude oil with high water content, high viscosity, or high wax content, excessively high crude oil density often leads to difficulties in wellhead lifting, increased pipeline resistance, and even problems such as wax buildup and blockage. Therefore, taking appropriate control measures at the wellhead to promptly reduce fluid density is a crucial step in ensuring the efficient and stable operation of the oil production system.

[0003] Currently, the traditional method for reducing fluid density at oil wellheads mainly involves installing fixed gas injection nozzles at the wellhead pipeline. This involves directly injecting high-pressure gas (such as natural gas, air, or carbon dioxide) into the crude oil to achieve gas mixing and density reduction. However, this traditional method has significant drawbacks in practical applications: the fixed nozzles have a single, static injection position, making it prone to agglomeration and the formation of large bubbles during continuous local injection. These large bubbles rise and escape from the oil-water phase very quickly, making it difficult to form a stable suspension with the crude oil. This not only significantly reduces the efficiency of gas mixing and density reduction but also easily leads to wellhead pressure fluctuations and gas lock phenomena. Existing gas mixing devices mostly rely on the fluid's own flow for natural mixing, lacking strong mechanical shearing and dispersing mechanisms for the gas-liquid mixture. Furthermore, the bubble size cannot be effectively miniaturized, resulting in an unstable gas-liquid phase. The fluid density rapidly recovers after leaving the wellhead, failing to achieve long-term density reduction. Finally, the crude oil at the wellhead generally contains large amounts of waxes, gums, asphaltene, and silt, among other impurities. Fixed nozzles are in a relatively stagnant local flow field for a long time. Wax and impurities are very easy to deposit, crystallize and adhere around the nozzle, causing frequent blockage or jamming of the nozzle, which seriously affects the reliability of continuous operation of the device and the daily maintenance cost is high. Therefore, this application proposes a fluid density reduction control device at the wellhead of the oil production well. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the background art by proposing a device for controlling the reduction of fluid density at the wellhead of an oil production well.

[0005] The technical solution of this invention: A fluid density reduction control device for oil wellheads, comprising an oil pipeline and an oil inlet, wherein the oil inlet is located at one end of the oil pipeline, and an oil outlet is located at the other end of the oil pipeline. Mounting frames are fixedly installed on both sides of the oil pipeline, and a reciprocating screw is rotatably mounted on the mounting frames. A slider is slidably mounted on the mounting frames, and the slider is threadedly connected to the reciprocating screw. A motor is fixedly mounted at one end of the mounting frames, and the output shaft of the motor is fixedly connected to the reciprocating screw. A guide plate is hinged to one side of the reciprocating screw. Sealing grooves are located on both sides of the oil pipeline, and a spherical object is rotatably mounted within the sealing groove. The gas delivery chamber includes a sealing gasket within the sealing groove, which fits tightly against the spherical gas delivery chamber. The spherical gas delivery chamber is hollow and has multiple gas outlets. A high-pressure nozzle is fixedly installed inside each gas outlet and communicates with it. A positioning block is slidably installed on one side of the spherical gas delivery chamber, with one bottom end of the positioning block hinged to a guide plate. A pressurizing air pump is fixedly installed on the oil delivery pipe, and connecting pipes are fixedly installed on both sides of the pressurizing air pump. One end of each connecting pipe communicates with the spherical gas delivery chamber. The oil delivery pipe is equipped with a dispersing mechanism to fully disperse the mixed oil-gas solution.

[0006] Optionally, the dispersing mechanism includes a rotating shaft rotatably mounted on one end of the mounting frame, a first pulley fixedly mounted on one end of the rotating shaft, a connecting shaft rotatably mounted inside the oil supply pipe, a crushing fan blade fixedly mounted on one end of the connecting shaft, the crushing fan blade being inclined, a plurality of crushing rods arranged at equal intervals fixedly mounted on the connecting shaft, and a second pulley fixedly mounted on the other end of the connecting shaft passing through the oil supply pipe, with a belt sleeved between the second pulley and the first pulley.

[0007] Optionally, a positioning rod is fixedly installed at one end of the mounting frame, and a positioning plate is fixedly installed on the positioning rod. The positioning plate is rotatably connected to the first pulley.

[0008] Optionally, a connecting rod is fixedly mounted on one of the sliders, one end of which is fixedly connected to the other slider. The connecting rod is U-shaped and is bolted to the slider.

[0009] Optionally, fixing rods are fixedly installed on both sides of the oil pipeline, and one end of the fixing rod is fixedly connected to the mounting frame.

[0010] Optionally, a connecting column is fixedly installed at one end of the positioning block, and an installation block is slidably installed at one end of the connecting column, with the installation block being fixedly connected to the spherical air delivery chamber.

[0011] Optionally, a spring is fitted onto the connecting column, and the two ends of the spring are fixedly connected to the positioning block and the mounting block, respectively.

[0012] Optionally, a support plate is fixedly installed on the oil pipeline, the support plate is fixedly connected to the pressurizing air pump, an air inlet is fixedly installed at one end of the pressurizing air pump, a connecting frame is fixedly installed on the air inlet, a filter screen is fixedly installed on the connecting frame, the connecting frame and the air inlet are bolted together, and air outlet grooves are fixedly installed at both ends of the pressurizing air pump. The air outlet grooves are connected to the connecting pipe, and a connecting flange for improving sealing is provided between the air outlet grooves and the connecting pipe.

[0013] Optionally, the mounting frame is provided with a sliding groove, and the slider is located in the sliding groove and slidably connected to the sliding groove.

[0014] Optionally, a sealing shaft is fixedly installed on one side of the oil pipeline. The sealing shaft is rotatably connected to the connecting shaft, and a sealing ring is provided inside the sealing shaft to prevent the oil-gas mixture from overflowing.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects:

[0016] This invention uses a reciprocating screw and guide plate to drive a spherical gas delivery chamber to continuously swing horizontally within a sealed groove. Combined with high-pressure gas injected by a pressurized air pump, it breaks through the limitations of traditional single-point jet injection and effectively avoids the formation of large bubbles due to local gas accumulation. At the same time, it works in conjunction with the downstream coaxially driven inclined pulverizing fan blades and pulverizing rod to perform multi-stage mechanical dispersion, cutting the gas into micron-sized microbubbles, significantly slowing down the bubble's upward escape speed, and improving the fluid density reduction effect by more than 30%.

[0017] Furthermore, by using a single motor as a power source, the device not only achieves the reciprocating oscillation of the gas delivery chamber, but also synchronously drives the dispersing mechanism to rotate at high speed through a belt pulley transmission mechanism. This eliminates the need for multiple power units, greatly simplifies the wellhead explosion-proof structure, improves explosion-proof safety, and reduces energy consumption.

[0018] Furthermore, by continuously oscillating the spherical gas delivery chamber, the high-pressure nozzle is placed in a dynamically changing flow field. Utilizing the dual effects of fluid mechanical shearing and high-pressure airflow scouring, the crystallization and accumulation of wax and gum in crude oil at the nozzle is effectively prevented, ensuring the long-term stable operation of the unit.

[0019] This invention achieves high-dispersion microbubble mixing and efficient density reduction of gas and oil media by using a single power source to dynamically swing the jet in a spherical gas delivery chamber and mechanical multi-stage micro-shearing. Attached Figure Description

[0020] Figure 1 Schematic diagram of a control device for reducing fluid density at the oil wellhead Figure 1 ;

[0021] Figure 2 Schematic diagram of a control device for reducing fluid density at the oil wellhead Figure 2 ;

[0022] Figure 3 Schematic diagram of a control device for reducing fluid density at the oil wellhead Figure 3 ;

[0023] Figure 4 Schematic diagram of a control device for reducing fluid density at the oil wellhead Figure 4 ;

[0024] Figure 5 Schematic diagram of a control device for reducing fluid density at the oil wellhead Figure 5 ;

[0025] Figure 6 This is a schematic diagram of the spherical gas delivery chamber structure;

[0026] Figure 7 for Figure 1 A magnified schematic diagram of the local structure at point A;

[0027] Figure 8 for Figure 2 A magnified schematic diagram of the structure at point B in the middle.

[0028] Reference numerals: 1. Oil supply pipe; 2. Oil inlet; 3. Oil outlet; 4. Mounting frame; 5. Slide groove; 6. Slider; 7. Reciprocating screw; 8. Guide plate; 9. Spring; 10. Positioning block; 11. Connecting rod; 12. Spherical air supply chamber; 13. Fixing rod; 14. Air outlet; 15. Sealing groove; 16. Crushing fan blade; 17. Connecting shaft; 18. Crushing rod; 19. Sealing shaft; 20. First pulley; 21. Second pulley; 22. Belt; 23. Positioning rod; 24. Pressurized air pump; 25. Air inlet; 26. Air outlet groove; 27. Support plate; 28. Connecting pipe; 29. ​​Connecting frame; 30. Filter screen; 31. Connecting column; 32. Mounting block; 33. Motor; 34. Positioning plate; 35. Rotating shaft. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0031] Example 1

[0032] like Figure 1-8As shown, the oil wellhead fluid density reduction control device proposed in this invention includes an oil pipeline 1 and an oil inlet 2, which is located at one end of the oil pipeline 1. An oil outlet 3 is located at the other end of the oil pipeline 1. Mounting frames 4 are fixedly installed on both sides of the oil pipeline 1. A reciprocating screw 7 is rotatably mounted on the mounting frames 4. A slider 6 is slidably mounted on the mounting frames 4 and threadedly connected to the reciprocating screw 7. A motor 33 is fixedly mounted on one end of the mounting frames 4, and the output shaft of the motor 33 is fixedly connected to the reciprocating screw 7. A guide plate 8 is hinged to one side of the reciprocating screw 7. Sealing grooves 15 are located on both sides of the oil pipeline 1. A spherical gas delivery chamber 12 is rotatably mounted within the sealing groove 15. A sealing gasket is placed within the sealing groove 15, and the sealing gasket is tightly fitted to the spherical gas delivery chamber 12. The spherical gas delivery chamber 12 is a hollow cavity with multiple gas outlets 14. High-pressure nozzles are fixedly installed inside each outlet 14 and are connected to the outlets. A positioning block 10 is slidably installed on one side of the spherical gas delivery chamber 12, with one bottom end of the positioning block 10 hinged to the guide plate 8. A pressurized air pump 24 is fixedly installed on the oil delivery pipe 1, with connecting pipes 28 fixedly installed on both sides of the pressurized air pump 24. One end of the connecting pipe 28 is connected to the spherical gas delivery chamber 12. A dispersing mechanism is installed inside the oil delivery pipe 1 to fully disperse the mixed oil-gas solution. When it is necessary to reduce the fluid density, the motor 33 is started. The output shaft of the motor 33 drives the reciprocating screw 7 to rotate, and the reciprocating screw 7 drives the slider 6 to perform horizontal reciprocating motion on the mounting frame 4. A connecting rod 11 is fixedly installed between the sliders 6, enabling the two sliders 6 to move synchronously. When the sliders 6 move, they squeeze or pull the guide plate 8. The guide plate 8 drives the positioning block 10 at one end to move together, and the positioning block 10 drives the spherical air delivery chamber 12 at one end to move together. This causes the spherical air delivery chamber 12 to swing horizontally within the sealing groove 15. This is coordinated with the activation of the pressurizing air pump 24, which draws in the filtered gas and then pressurizes and ejects it from the outlet groove 26. The ejected gas is then transported to the connecting pipe 28, and then from the connecting pipe 28 to the spherical air delivery chamber 12. Finally, it is ejected from the outlet 14 on the spherical air delivery chamber 12. The pressurized gas is then transported into the fluid to reduce the fluid density. This, combined with the swinging motion of the spherical air delivery chamber 12, prevents prolonged local pressurization. The gas generates large bubbles, improving the uniformity of gas distribution within the fluid. Driven by motor 33, the reciprocating screw 7, along with the linkage mechanism of slider 6, guide plate 8, and positioning block 10, causes the spherical gas delivery chamber 12 to continuously swing horizontally within the sealing groove 15. This overcomes the defect of traditional fixed nozzles where continuous single-point gas injection easily leads to bubble aggregation into large bubbles, significantly improving the uniform dispersion of gas in the oil-water phase. Wellhead crude oil often contains wax, colloids, and mud, making static nozzles extremely prone to scaling and clogging. The continuous swing of the spherical gas delivery chamber 12 keeps the high-pressure nozzle outlet in a dynamically changing flow field at all times. Combined with the impact force of the high-pressure airflow, it generates a self-cleaning effect of mechanical friction and airflow scouring, completely solving the problem of wax buildup and blockage in traditional wellhead gas-injecting nozzles.

[0033] Example 2

[0034] like Figure 1-8As shown, the dispersing mechanism includes a rotating shaft 35 rotatably mounted on one end of the mounting frame 4. A first pulley 20 is fixedly mounted on one end of the rotating shaft 35. A connecting shaft 17 is rotatably mounted inside the oil supply pipe 1. A crushing fan blade 16 is fixedly mounted on one end of the connecting shaft 17. The crushing fan blade 16 is inclined. Multiple crushing rods 18 arranged at equal intervals are fixedly mounted on the connecting shaft 17. A second pulley 21 is fixedly mounted on the other end of the connecting shaft 17, which passes through the oil supply pipe 1. A belt 22 is sleeved between the second pulley 21 and the first pulley 20. A positioning rod 23 is fixedly mounted on one end of the mounting frame 4. A positioning plate 34 is fixedly mounted on the positioning rod 23 and rotatably connected to the first pulley 20. A connecting rod 11 is fixedly mounted on one of the sliders 6. One end of rod 11 is fixedly connected to another slider 6. The connecting rod 11 is U-shaped and is bolted to the slider 6. The connecting rod 11 clamps the sliders 6 on both sides of the oil pipe 1 into a rigid whole, ensuring that the reciprocating motion on both sides is absolutely synchronized. This avoids the phenomenon of the slider 6 getting stuck or wearing unevenly in the groove 5 due to uneven force when driven on one side, thus ensuring mechanical stability and durability under high-intensity continuous operation. Fixed rods 13 are fixedly installed on both sides of the oil pipe 1. One end of the fixed rod 13 is fixedly connected to the mounting frame 4. A connecting column 31 is fixedly installed on one end of the positioning block 10. A mounting block 32 is slidably installed on one end of the connecting column 31. The mounting block 32 is fixedly connected to the spherical air supply chamber 12. A spring 9 is sleeved on the connecting column 31. The two ends of the spring 9 are... The positioning block 10 and mounting block 32 are fixedly connected. A support plate 27 is fixedly installed on the oil supply pipe 1. The support plate 27 is fixedly connected to the pressurizing air pump 24. An air inlet 25 is fixedly installed at one end of the pressurizing air pump 24. A connecting frame 29 is fixedly installed on the air inlet 25. A filter screen 30 is fixedly installed on the connecting frame 29. The connecting frame 29 and the air inlet 25 are bolted together. Air outlet grooves 26 are fixedly installed at both ends of the pressurizing air pump 24. The air outlet grooves 26 are connected to the connecting pipe 28. A connecting flange for improving sealing is provided between the air outlet grooves 26 and the connecting pipe 28. A sliding groove 5 is opened on the mounting frame 4. The slider 6 is located in the sliding groove 5 and is slidably connected to the sliding groove 5. A sealing shaft 19 is fixedly installed on one side of the oil supply pipe 1. The sealing shaft 19 rotates with the connecting shaft 17. The connection and sealing shaft 19 are equipped with a sealing ring to prevent the oil-gas mixture from overflowing. When the reciprocating screw 7 rotates, it drives the rotating shaft 35 to rotate together. The rotating shaft 35 drives the first pulley 20 at one end, the first pulley 20 drives the second pulley 21 to rotate, the second pulley 21 drives the connecting shaft 17 to rotate together, and the connecting shaft 17 drives the pulverizing fan blade 16 to rotate. The pulverizing fan blade 16 initially disperses the fluid after the air is added, breaking large bubbles into small bubbles. The connecting shaft 17 drives multiple pulverizing rods 18 to rotate together. The pulverizing rods 18 further disperse the dispersed fluid. The small bubbles float very slowly in the oil-water phase and can be suspended for a long time. The inclined pulverizing fan blade 16 and multiple sets of pulverizing rods 18, which are linked by the same power source, form a multi-stage dispersing structure.The inclined pulverizing fan blade 16 first stirs the flow field and performs preliminary mechanical shearing on the mixed-phase fluid, breaking up large and medium-sized bubbles; then the pulverizing rod 18 performs secondary high-frequency collision and dispersal to form micron-sized suspended bubbles, which greatly slows down the speed at which bubbles rise and escape, thereby increasing the effective duration of density reduction and the overall density reduction efficiency by more than 30%.

[0035] Working principle: When it is necessary to reduce the fluid density, the motor 33 is started. The output shaft of the motor 33 drives the reciprocating screw 7 to rotate. The reciprocating screw 7 drives the slider 6 to perform horizontal reciprocating motion on the mounting frame 4. Since the connecting rod 11 is fixedly installed between the two sliders 6, the two sliders 6 can move synchronously. When the slider 6 moves, it squeezes or pulls the guide plate 8. The guide plate 8 drives the positioning block 10 at one end to move together. The positioning block 10 drives the spherical air delivery chamber 12 at one end to move together, so that the spherical air delivery chamber 12 performs horizontal swinging motion in the sealing groove 15. This, in conjunction with starting the pressurizing air pump 24, pressurizes the air. The air pump 24 draws in the filtered gas, pressurizes it, and ejects it from the outlet 26. The ejected gas is then transported to the connecting pipe 28, and from there to the spherical gas delivery chamber 12. It is then ejected from the outlet 14 on the spherical gas delivery chamber 12. The pressurized gas is delivered into the fluid, reducing its density. Combined with the oscillation of the spherical gas delivery chamber 12, this prevents large bubbles from forming due to prolonged localized pressurization, improving the uniformity of gas distribution within the fluid. The motor 33 drives the reciprocating screw 7, and through the linkage mechanism of the slider 6, guide plate 8, and positioning block 10, the spherical gas delivery chamber 12 moves within the sealing groove 15. Continuous horizontal oscillation overcomes the defect of traditional fixed nozzles where single-point continuous air jetting easily leads to bubble agglomeration into large bubbles, significantly improving the uniform dispersion of gas in the oil-water phase. Wellhead crude oil often contains wax, colloids, and silt, making static nozzles extremely prone to scaling and clogging. The continuous oscillation of the spherical gas delivery chamber 12 keeps the high-pressure nozzle outlet in a dynamically changing flow field at all times. Combined with the impact force of the high-pressure airflow, it generates a self-cleaning effect of mechanical friction and airflow scouring, completely solving the problem of wax buildup and blockage in traditional wellhead gas-injecting nozzles. When the reciprocating screw 7 rotates, it drives the rotating shaft 35 to rotate as well. The first pulley 20 at one end drives the second pulley 21 to rotate, and the second pulley 21 drives the connecting shaft 17 to rotate together. The connecting shaft 17 drives the pulverizing fan blade 16 to rotate. The pulverizing fan blade 16 initially disperses the fluid after the air is added, breaking large bubbles into small bubbles. The connecting shaft 17 drives multiple pulverizing rods 18 to rotate together. The pulverizing rods 18 further disperse the dispersed fluid. The small bubbles float very slowly in the oil-water phase and can be suspended for a long time. The inclined pulverizing fan blade 16 and multiple pulverizing rods 18 linked by the same power source form a multi-stage dispersing structure. The inclined pulverizing fan blade 16 first stirs the flow field and performs preliminary mechanical shearing on the mixed-phase fluid, breaking up large and medium-sized bubbles; then the pulverizing rod 18 performs secondary high-frequency collision and dispersal to form micron-sized suspended bubbles, which greatly slows down the speed at which bubbles rise and escape, thereby increasing the effective duration of density reduction and the overall density reduction efficiency by more than 30%. This invention achieves high-dispersion microbubble mixing and efficient density reduction of gas and oil media by using a single power source to link the dynamic swing jet of the spherical gas delivery chamber with mechanical multi-stage micro-shearing.

[0036] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A device for controlling fluid density reduction at the wellhead of an oil production well, comprising an oil pipeline (1), characterized in that, It also includes an oil inlet (2), which is located at one end of the oil pipeline (1), and an oil outlet (3) at the other end of the oil pipeline (1). Mounting frames (4) are fixedly installed on both sides of the oil pipeline (1). A reciprocating screw (7) is rotatably mounted on the mounting frame (4). A slider (6) is slidably mounted on the mounting frame (4). The slider (6) is threadedly connected to the reciprocating screw (7). A motor (33) is fixedly mounted on one end of the mounting frame (4). The output shaft of the motor (33) is fixedly connected to the reciprocating screw (7). A guide plate (8) is hinged to one side of the reciprocating screw (7). Sealing grooves (15) are provided on both sides of the oil pipeline (1). A spherical gas delivery chamber (12) is rotatably mounted inside the sealing groove (15). A sealing gasket is provided inside, and the sealing gasket is tightly fitted to the spherical gas delivery chamber (12). The spherical gas delivery chamber (12) is a cavity. Multiple air outlets (14) are provided on the spherical gas delivery chamber (12). A high-pressure nozzle is fixedly installed in the air outlet (14). The high-pressure nozzle is connected to the air outlet (14). A positioning block (10) is slidably installed on one side of the spherical gas delivery chamber (12). One end of the bottom of the positioning block (10) is hinged to the guide plate (8). A pressurizing air pump (24) is fixedly installed on the oil delivery pipe (1). Connecting pipes (28) are fixedly installed on both sides of the pressurizing air pump (24). One end of the connecting pipe (28) is connected to the spherical gas delivery chamber (12). A dispersing mechanism is provided inside the oil delivery pipe (1) to fully disperse the mixed oil and gas solution.

2. The wellhead fluid density reduction control device according to claim 1, characterized in that, The dispersing mechanism includes a rotating shaft (35) rotatably mounted on one end of the mounting frame (4), a first pulley (20) fixedly mounted on one end of the rotating shaft (35), a connecting shaft (17) rotatably mounted inside the oil pipeline (1), a crushing fan blade (16) fixedly mounted on one end of the connecting shaft (17), the crushing fan blade (16) being inclined, a plurality of crushing rods (18) arranged at equal distances fixedly mounted on the connecting shaft (17), a second pulley (21) fixedly mounted on the other end of the connecting shaft (17) passing through the oil pipeline (1), and a belt (22) sleeved between the second pulley (21) and the first pulley (20).

3. The wellhead fluid density reduction control device according to claim 2, characterized in that, A positioning rod (23) is fixedly installed at one end of the mounting frame (4), and a positioning plate (34) is fixedly installed on the positioning rod (23). The positioning plate (34) is rotatably connected to the first pulley (20).

4. The wellhead fluid density reduction control device according to claim 1, characterized in that, A connecting rod (11) is fixedly installed on one of the sliders (6). One end of the connecting rod (11) is fixedly connected to the other slider (6). The connecting rod (11) is U-shaped and is bolted to the slider (6).

5. The wellhead fluid density reduction control device according to claim 1, characterized in that, The oil pipeline (1) is fixedly installed on both sides with fixing rods (13), and one end of the fixing rods (13) is fixedly connected to the mounting frame (4).

6. The wellhead fluid density reduction control device according to claim 1, characterized in that, One end of the positioning block (10) is fixedly installed with a connecting column (31), and one end of the connecting column (31) is slidably installed with an installation block (32). The installation block (32) is fixedly connected to the spherical gas delivery chamber (12).

7. The wellhead fluid density reduction control device according to claim 6, characterized in that, A spring (9) is fitted on the connecting column (31), and the two ends of the spring (9) are fixedly connected to the positioning block (10) and the mounting block (32) respectively.

8. The wellhead fluid density reduction control device according to claim 1, characterized in that, A support plate (27) is fixedly installed on the oil pipeline (1). The support plate (27) is fixedly connected to the pressurizing air pump (24). An air inlet (25) is fixedly installed at one end of the pressurizing air pump (24). A connecting frame (29) is fixedly installed on the air inlet (25). A filter screen (30) is fixedly installed on the connecting frame (29). The connecting frame (29) and the air inlet (25) are bolted together. Air outlet grooves (26) are fixedly installed at both ends of the pressurizing air pump (24). The air outlet grooves (26) are connected to the connecting pipe (28). A connecting flange for improving sealing is provided between the air outlet grooves (26) and the connecting pipe (28).

9. The wellhead fluid density reduction control device according to claim 1, characterized in that, The mounting frame (4) has a groove (5) and the slider (6) is located in the groove (5) and is slidably connected to the groove (5).

10. The wellhead fluid density reduction control device according to claim 2, characterized in that, A sealing shaft (19) is fixedly installed on one side of the oil pipeline (1). The sealing shaft (19) is rotatably connected to the connecting shaft (17). A sealing ring is provided inside the sealing shaft (19) to prevent the oil-gas mixture from overflowing.

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