Water-mixed valve group combined wellhead device with anti-freezing and plugging function

Abstract

The present application relates to the technical fields of petroleum machinery equipment, in particular to a combined wellhead device with water mixing valve group and anti-freezing and anti-blocking function, which comprises a main valve body, an oil inlet pipe and an oil outlet pipe connected to the two ends of the main valve body respectively, and an anti-freezing assembly installed on the oil inlet pipe. The anti-freezing assembly comprises a water inlet pipe, a shunt pipe connected to one end of the water inlet pipe, a first connecting pipe arranged inside the oil inlet pipe, a block assembly arranged inside the oil inlet pipe, a separation assembly installed on one end of the block assembly, a second connecting pipe arranged at a position of the oil inlet pipe close to the main valve body, and a fluid linkage assembly arranged outside the oil inlet pipe. The device can effectively deal with the freezing and blocking problem. The fluid linkage assembly works to drive the separation assembly to block the frozen block, and the block assembly works to break the frozen block, thereby further improving the freezing and blocking treatment efficiency.

Description

Technical Field

[0001] This invention relates to the field of petroleum machinery and equipment technology, and in particular to a water injection valve assembly wellhead device with anti-freezing and anti-clogging function. Background Technology

[0002] Water mixing valve assemblies are widely used in oilfield production. They are typically installed at the wellhead of oil wells and their function is to add high-temperature water at a certain pressure to the crude oil coming out of the wellhead. This increases the fluidity and flow force of the crude oil, allowing it to be transported normally to the metering room through the return pipeline. Because each well is located at a different distance from the pump house and the oil temperature varies, the actual amount of water required for each well also varies. Another function of the water mixing valve assembly is to shut off the water mixing during sampling. When sampling oil from each well, the water mixing valve assembly needs to be closed. If water enters the crude oil during sampling, it will affect the sampling and analysis results.

[0003] When existing water mixing valve assemblies are used in low-temperature environments, the low temperature of the well oil makes the oil more viscous, resulting in slower transport in pipelines. In severe cases, the oil may freeze into lumps, which can easily cause blockages in the water mixing valve assembly, thus affecting the normal operation of the water mixing valve. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a water injection valve assembly wellhead device with anti-freezing and anti-blocking function to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides a water injection valve assembly wellhead device with anti-freezing and anti-blocking function, comprising a main valve body, wherein an oil inlet pipe and an oil outlet pipe are respectively connected to both ends of the main valve body, and an anti-freezing component is installed on the oil inlet pipe, the anti-freezing component comprising:

[0006] The inlet pipe has a branch pipe connected to one end;

[0007] A first connecting pipe is disposed inside the oil inlet pipe, and one end of the first connecting pipe is bent and passes through the oil inlet pipe to communicate with the diverting pipe.

[0008] A fragmentation assembly is disposed inside the oil inlet pipe. The fragmentation assembly is hollow. One end of the fragmentation assembly is connected to the free end of the first connecting pipe, and the other end is equipped with a separation component for screening frozen blocks.

[0009] The second connecting pipe is located near the main valve body of the oil inlet pipe. The second connecting pipe passes through the oil inlet pipe. One end of the second connecting pipe is connected to the water inlet pipe near the branch pipe, and the other end is used to connect to the hot water source.

[0010] A fluid linkage assembly is disposed outside the oil inlet pipe. One end of the fluid linkage assembly is connected to the diverter pipe, and the other end is connected to the separation assembly via a transmission connection.

[0011] Preferably, a first solenoid valve is connected to the end of the water inlet pipe away from the diversion pipe.

[0012] Preferably, the fragment assembly includes:

[0013] An annular box is fixed inside the oil inlet pipe. The outer annular surface of the annular box is connected to one end of the second connecting pipe, and an annular through hole is provided on the inner annular surface of the annular box.

[0014] An annular sealing plate is disposed inside the annular box, and the inner annular surface of the annular sealing plate covers the annular through hole;

[0015] A shaft tube, one end of which is connected to the free end of the first connecting tube, and a disk is fixedly provided at the other end. The disk has a hollow structure inside, and the hollow structure is connected to the shaft tube.

[0016] A driving component is disposed between the shaft tube and the first connecting tube, and the driving component is connected to the shaft tube in a driving manner.

[0017] Multiple fragment tubes are disposed within the annular through hole. One end of each fragment tube is fixedly connected to and communicates with the annular sealing plate, and the other end is fixedly connected to the outer surface of the disc and communicates with the hollow structure.

[0018] Preferably, the driving element includes:

[0019] The housing has a center on one side that is fixedly connected to and communicates with the free end of the first connecting pipe. One end of the shaft tube passes through the center of the housing and communicates with the free end of the first connecting pipe. The shaft tube is rotatably connected to the housing. An inlet pipe and an outlet pipe are connected tangentially on the outer surface of the housing. The free end of the inlet pipe passes through the oil inlet pipe and communicates with the diverter pipe. The free end of the outlet pipe passes through the oil inlet pipe and communicates with the second connecting pipe.

[0020] An impeller is disposed inside the housing. The impeller is sleeved on the shaft tube and fixedly connected. Sealing discs that fit against the inner wall of the housing are fixed on both sides of the impeller.

[0021] Preferably, a second solenoid valve is provided outside the oil inlet pipe, and the second solenoid valve is installed on the oil inlet pipe.

[0022] Preferably, the separation component includes:

[0023] An intermediate plate is disposed between the fragment assembly and the main valve body, and both ends of the intermediate plate are fixedly connected to the inner wall of the oil inlet pipe.

[0024] Two arc-shaped frames are hinged to the two sides of the middle plate respectively with their straight edges. The arc surface of each arc-shaped frame is adapted to fit the inner wall of the oil inlet pipe. The shaft of each arc-shaped frame hinged to the middle plate passes through the oil inlet pipe and is connected to the fluid linkage assembly for transmission. Each arc-shaped frame is fixedly connected to the corresponding shaft, and each arc-shaped frame is equipped with a screen inside.

[0025] Preferably, the screen is made of heating wire. The arc frame has a cavity at a location away from the middle plate. The cavity contains a connecting plate and two guide rods. A convex shaft is fixed on one side of the connecting plate and passes through the arc surface of the arc frame. A first conductive sheet is fixed on the other side of the connecting plate. A second conductive sheet is fixed on the side of the cavity near the first conductive sheet. One end of both the first and second conductive sheets is electrically connected to the screen. Each guide rod passes through the connecting plate, and both ends of each guide rod are fixedly connected to the inner wall of the cavity. A spring is sleeved on each guide rod, and both ends of each spring abut against the side of the connecting plate away from the convex shaft and the inner wall of the cavity, respectively.

[0026] Preferably, the fluid linkage component includes:

[0027] The third connecting pipe has one end connected to the shunt pipe;

[0028] A U-shaped tube is fixed to the oil inlet pipe by a bracket. A rectangular through hole is provided on the outer wall of the U-shaped tube. A connecting rod is slidably connected inside the rectangular through hole. A rack is fixed at one end of the connecting rod and an arc-shaped sealing strip is fixed at the other end. The arc-shaped sealing strip is fitted inside the U-shaped tube and covers the rectangular through hole. A piston is fixed in the middle of the arc-shaped sealing strip, and an air outlet is provided at the end of the U-shaped tube near the rectangular through hole.

[0029] The three-way solenoid valve has one port connected to a drain pipe, and the other two ports are respectively connected to the free end of the third connecting pipe and the end of the U-shaped pipe away from the air outlet.

[0030] Two gears are respectively sleeved on the shaft and fixedly connected, and the two gears are meshed together, with one of the gears meshing with the rack.

[0031] The beneficial effects of this invention are as follows: Hot water is introduced into the branch pipe through the inlet pipe, and then introduced into the first connecting pipe and the fluid linkage component through the branch pipe. It is then introduced into the fragmentation component through the first connecting pipe, and into the second connecting pipe through the fragmentation component, forming a circulation. This circulation process heats the oil inlet pipe through the heat conduction of the hot water, effectively addressing the freezing blockage problem. The fluid linkage component drives the separation component to block frozen blocks, and the fragmentation component breaks up the frozen blocks, further improving the efficiency of freezing blockage treatment. This solves the problem that existing water mixing valve assemblies, when used in low-temperature environments, suffer from viscous oil due to the low temperature of the well oil, resulting in slow transport in the pipeline and, in severe cases, freezing into lumps that easily cause blockages in the water mixing valve assembly, thus affecting the normal operation of the water mixing valve. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the internal structure of the oil inlet pipe according to an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the fragment assembly according to an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the structure of the separation component and the fluid linkage component according to an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the internal structure of the cavity in an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of the internal structure of the U-shaped tube according to an embodiment of the present invention.

[0039] The diagram is marked as follows:

[0040] 1. Main valve body; 2. Oil inlet pipe; 3. Oil outlet pipe; 4. Water inlet pipe; 5. Diverter pipe; 6. First connecting pipe; 7. Second connecting pipe; 8. First solenoid valve; 9. Annular box; 10. Annular through hole; 11. Annular sealing plate; 12. Shaft tube; 13. Disc; 14. Fragmentation pipe; 15. Housing; 16. Liquid inlet pipe; 17. Liquid outlet pipe; 18. Impeller; 19. Sealing disc; 20. Second solenoid valve; 21. 1. Intermediate plate; 22. Arc frame; 23. Shaft; 24. Screen; 25. Connecting plate; 26. Guide rod; 27. Convex shaft; 28. First conductive sheet; 29. ​​Second conductive sheet; 30. Spring; 31. Third connecting pipe; 32. U-shaped pipe; 33. Connecting rod; 34. Rack; 35. Arc sealing strip; 36. Piston; 37. Vent hole; 38. Three-way solenoid valve; 39. Drain pipe; 40. Gear. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0042] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] like Figures 1 to 6 As shown, a water-injection valve assembly wellhead device with anti-freezing and anti-blocking function includes a main valve body 1. An oil inlet pipe 2 and an oil outlet pipe 3 are respectively connected to both ends of the main valve body 1. An anti-freezing component is installed on the oil inlet pipe 2, and the anti-freezing component includes:

[0044] Water inlet pipe 4, one end of which is connected to a diversion pipe 5;

[0045] The first connecting pipe 6 is disposed inside the oil inlet pipe 2, and one end of the first connecting pipe 6 is bent and passes through the oil inlet pipe 2 to communicate with the diversion pipe 5.

[0046] A fragmentation assembly is disposed inside the oil inlet pipe 2. The fragmentation assembly is hollow. One end of the fragmentation assembly is connected to the free end of the first connecting pipe 6, and the other end is equipped with a separation component for screening frozen blocks.

[0047] The second connecting pipe 7 is located near the main valve body 1 of the oil inlet pipe 2. The second connecting pipe 7 passes through the oil inlet pipe 2. One end of the second connecting pipe 7 is connected to the water inlet pipe 4 near the branch pipe 5, and the other end is used to connect to the hot water source.

[0048] A fluid linkage assembly is disposed outside the oil inlet pipe 2. One end of the fluid linkage assembly is connected to the diverter pipe 5, and the other end is connected to the separation assembly via a transmission connection.

[0049] As an optional embodiment, the end of the water inlet pipe 4 away from the diversion pipe 5 is connected to a first solenoid valve 8.

[0050] As an optional embodiment, the fragment assembly includes:

[0051] An annular box 9 is fixed inside the oil inlet pipe 2. The outer annular surface of the annular box 9 is connected to one end of the second connecting pipe 7. An annular through hole 10 is provided on the inner annular surface of the annular box 9.

[0052] An annular sealing plate 11 is disposed inside the annular box 9, and the inner annular surface of the annular sealing plate 11 covers the annular through hole 10;

[0053] The shaft tube 12 has one end connected to the free end of the first connecting tube 6, and the other end is fixed with a disk 13. The disk 13 has a hollow structure inside, and the hollow structure is connected to the shaft tube 12.

[0054] A driving component is disposed between the shaft tube 12 and the first connecting tube 6, and the driving component is connected to the shaft tube 12 in a transmission manner;

[0055] Multiple fragment tubes 14 are disposed within the annular through hole 10. One end of each fragment tube 14 is fixedly connected to and communicates with the annular sealing plate 11, and the other end is fixedly connected to the outer surface of the disc 13 and communicates with the hollow structure.

[0056] like Figure 1 , Figure 2 and Figure 3As shown, by opening the first solenoid valve 8, hot water is introduced into the inlet pipe 4 into the branch pipe 5, then into the first connecting pipe 6, then into the shaft pipe 12, then into the interior of the disc 13, then into the fragmentation pipe 14, then into the annular box 9, then into the second connecting pipe 7, and finally into the hot water source, forming a circulation. The hot water heats the oil inlet pipe 2 through heat conduction, effectively addressing the freezing problem. Due to the liquid flow rate, to prevent freezing blockage... The flow is blocked by a separation component, preventing the frozen blockage from flowing into the oil outlet pipe 3 through the main valve body 1. At the same time, the drive unit drives the shaft tube 12 to rotate, the shaft tube 12 drives the disc 13 to rotate, the disc 13 drives the fragmentation tube 14 to rotate, and the fragmentation tube 14 drives the annular sealing plate 11 to rotate, thereby breaking up the frozen blockage and further improving the efficiency of handling the frozen blockage. It should be noted that the annular box 9, the annular through hole 10 and the annular sealing plate 11 are treated with a strict sealing structure to ensure that oil will not enter the annular box 9 during the rotation of the annular sealing plate 11.

[0057] As an optional embodiment, the driver includes:

[0058] The housing 15 has a center on one side that is fixedly connected to and communicates with the free end of the first connecting pipe 6. One end of the shaft pipe 12 passes through the center of the housing 15 and communicates with the free end of the first connecting pipe 6. The shaft pipe 12 is rotatably connected to the housing 15. An inlet pipe 16 and an outlet pipe 17 are connected along the tangential direction on the outer surface of the housing 15. The free end of the inlet pipe 16 passes through the oil inlet pipe 2 and communicates with the diverter pipe 5. The free end of the outlet pipe 17 passes through the oil inlet pipe 2 and communicates with the second connecting pipe 7.

[0059] An impeller 18 is disposed inside the housing 15. The impeller 18 is sleeved on the shaft tube 12 and fixedly connected. Both sides of the impeller 18 are fixedly provided with sealing discs 19 that fit against the inner wall of the housing 15.

[0060] As an optional embodiment, a second solenoid valve 20 is provided on the outside of the oil inlet pipe 2, and the second solenoid valve 20 is installed on the liquid inlet pipe 16.

[0061] like Figure 1 , Figure 2 and Figure 3As shown, hot water is introduced into the inlet pipe 16 through the diverter pipe 5, and then into the housing 15 through the inlet pipe 16. The hot water acts on the impeller 18. Due to the sealing discs 19 on both sides of the impeller 18, the hot water can only act on the impeller 18, causing it to rotate. The hot water continues to be discharged through the outlet pipe 17 into the second connecting pipe 7. This cycle is repeated to ensure the impeller 18 rotates. The impeller 18 drives the shaft pipe 12 to rotate, which in turn drives the disc 13 to rotate, and the disc 13 drives the fragmentation pipe 14 to rotate. This process breaks up the frozen blockage. A second solenoid valve 20 is installed on the inlet pipe 16. The second solenoid valve 20 is opened or closed according to the temperature inside the oil inlet pipe 2. When the temperature inside the oil inlet pipe 2 is lower than the range that makes the oil viscous, the second solenoid valve 20 does not need to be opened, and the process can be completed by hot water circulation. When the temperature inside the oil pipe is lower than the range that makes the oil freeze, the second solenoid valve 20 is opened, so that the impeller 18 is driven by water to rotate and break up the frozen blockage, thereby improving the efficiency of freezing blockage treatment.

[0062] As an optional embodiment, the separation component includes:

[0063] An intermediate plate 21 is disposed between the fragment assembly and the main valve body 1, and both ends of the intermediate plate 21 are fixedly connected to the inner wall of the oil inlet pipe 2.

[0064] Two arc-shaped frames 22 are hinged to the two sides of the intermediate plate 21 respectively. The arc surface of each arc-shaped frame 22 is adapted to fit the inner wall of the oil inlet pipe 2. The shaft 23 of each arc-shaped frame 22 hinged to the intermediate plate 21 passes through the oil inlet pipe 2 and is connected to the fluid linkage assembly for transmission. Each arc-shaped frame 22 is fixedly connected to the corresponding shaft 23, and each arc-shaped frame 22 is equipped with a screen 24 inside.

[0065] like Figure 4 As shown, the fluid linkage component drives the shaft 23 to rotate, and the shaft 23 drives the arc frame 22 to flip, so that the two arc frames 22 unfold symmetrically with the middle plate 21 as the center. The arc surface of the arc frame 22 fits against the inner wall of the oil inlet pipe 2 and is blocked by the screen 24. Normal liquid oil is introduced into the oil outlet pipe 3 through the screen 24 and the main valve body 1. When the temperature in the oil inlet pipe 2 rises and no viscous oil or frozen blockage is generated, the fluid linkage component does not work, so that the arc frame 22 is reset under the thrust of the crude oil flow to ensure the crude oil flow rate.

[0066] As an optional embodiment, the screen 24 is made of heating wire. The arc frame 22 has a cavity at a location away from the intermediate plate 21. The cavity contains a connecting plate 25 and two guide rods 26. A convex shaft 27 is fixed on one side of the connecting plate 25 and passes through the arc surface of the arc frame 22. A first conductive sheet 28 is fixed on the other side of the connecting plate 25. A second conductive sheet 29 is fixed on the side of the cavity near the first conductive sheet 28. One end of the first conductive sheet 28 and the second conductive sheet 29 are electrically connected to the screen 24. Each guide rod 26 passes through the connecting plate 25, and both ends of each guide rod 26 are fixedly connected to the inner wall of the cavity. A spring 30 is sleeved on each guide rod 26, and both ends of each spring 30 abut against the side of the connecting plate 25 away from the convex shaft 27 and the inner wall of the cavity, respectively.

[0067] like Figure 4 and Figure 5 As shown, since the frozen blockage does not melt immediately after being broken up, but only breaks into pieces and adheres to the screen 24, in order to further improve the processing efficiency of the frozen blockage fragments, the screen 24 is made of heating wire. When the arc frame 22 is unfolded, the inner wall of the oil inlet pipe 2 will push the convex shaft 27 against the arc surface of the arc frame 22. The convex shaft 27 drives the connecting plate 25 to move, and the connecting plate 25 drives the first conductive sheet 28 to move to contact the second conductive sheet 29 and energize it, so that the heating wire screen 24 can be heated, thereby improving the processing efficiency of the frozen blockage fragments adhered to the screen 24.

[0068] As an optional embodiment, the fluid linkage component includes:

[0069] The third connecting pipe 31 has one end connected to the diversion pipe 5;

[0070] A U-shaped tube 32 is fixed to the oil inlet pipe 2 by a bracket. A rectangular through hole is provided on the outer wall of the U-shaped tube 32. A connecting rod 33 is slidably connected inside the rectangular through hole. A rack 34 is fixed to one end of the connecting rod 33, and an arc-shaped sealing strip 35 is fixed to the other end. The arc-shaped sealing strip 35 is fitted inside the U-shaped tube 32 and covers the rectangular through hole. A piston 36 is fixed in the middle of the arc-shaped sealing strip 35, and an air outlet 37 is provided at the end of the U-shaped tube 32 near the rectangular through hole.

[0071] The three-way solenoid valve 38 has one port connected to a drain pipe 39, and the other two ports are respectively connected to the free end of the third connecting pipe 31 and the end of the U-shaped pipe 32 away from the vent 37.

[0072] Two gears 40 are respectively sleeved on the shaft 23 and fixedly connected. The two gears 40 are meshed with each other, and one of the gears 40 meshes with the rack 34.

[0073] like Figure 2 , Figure 4 and Figure 6 As shown, when the arc-shaped frame 22 needs to be unfolded, the three-way solenoid valve 38 operates, causing the third connecting pipe 31 to introduce hot water from the diversion pipe 5 into the U-shaped pipe 32. This pushes the piston 36, causing the arc-shaped sealing strip 35 and connecting rod 33 to move. The connecting rod 33 then moves the rack 34, which in turn rotates one gear 40. This gear 40 then rotates another gear 40, which in turn rotates two shafts 23. These two shafts 23 then rotate the two arc-shaped frames 22, thus achieving the flipping operation of the arc-shaped frame 22. When the crude oil temperature... When the pump is raised and can be transported normally, the three-way solenoid valve 38 is activated, which closes the third connecting pipe 31 and connects the U-shaped pipe 32 to the drain pipe 39. The water in the U-shaped pipe 32 is discharged through the drain pipe 39, and the piston 36 is no longer pushed by water pressure. The thrust of the crude oil flow in the oil inlet pipe 2 will cause the arc frame 22 to flip, the arc frame 22 will cause the shaft 23 to flip, the shaft 23 will cause the gear 40 to flip, the gear 40 will cause the rack 34 to move, the rack 34 will cause the connecting rod 33 to move, and the connecting rod 33 will cause the piston 36 to move, thereby resetting the piston 36.

[0074] The working principle is as follows: Hot water is introduced into the diversion pipe 5 through the inlet pipe 4, and then introduced into the first connecting pipe 6 and the fluid linkage component through the diversion pipe 5. The hot water then enters the fragmentation component through the first connecting pipe 6, and then into the second connecting pipe 7, forming a circulation. Throughout the circulation process, the pipeline structure heats the oil inlet pipe 2 through the heat conduction of the hot water, effectively addressing the freezing blockage problem. The fluid linkage component drives the separation component to block the frozen blocks, and the fragmentation component breaks up the frozen blocks, further improving the efficiency of freezing blockage treatment. This solves the problem that existing water mixing valve groups, when used in low-temperature environments, suffer from viscous oil due to the low temperature of the well oil, resulting in slow transport in the pipeline and, in severe cases, freezing into lumps that easily cause blockages in the water mixing valve group, thus affecting the normal operation of the water mixing valve.

[0075] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A water-mixing valve assembly wellhead device with anti-freezing and anti-blocking function, comprising a main valve body (1), wherein an oil inlet pipe (2) and an oil outlet pipe (3) are respectively connected to both ends of the main valve body (1), and an anti-freezing component is installed on the oil inlet pipe (2), characterized in that, The antifreeze component includes: The water inlet pipe (4) is connected to a branch pipe (5) at one end; The first connecting pipe (6) is disposed inside the oil inlet pipe (2), and one end of the first connecting pipe (6) is bent and passes through the oil inlet pipe (2) to communicate with the diversion pipe (5); The fragment assembly is disposed inside the oil inlet pipe (2). The fragment assembly is hollow. One end of the fragment assembly is connected to the free end of the first connecting pipe (6), and the other end is equipped with a separation component for screening frozen blocks. The second connecting pipe (7) is located near the main valve body (1) of the oil inlet pipe (2). The second connecting pipe (7) passes through the oil inlet pipe (2). One end of the second connecting pipe (7) is connected to the water inlet pipe (4) near the branch pipe (5), and the other end is used to connect to the hot water source. A fluid linkage assembly is disposed outside the oil inlet pipe (2). One end of the fluid linkage assembly is connected to the diverter pipe (5), and the other end is connected to the separation assembly.

2. The wellhead device with anti-freezing and anti-blocking function of a water-injection valve group according to claim 1, characterized in that, The end of the water inlet pipe (4) away from the branch pipe (5) is connected to a first solenoid valve (8).

3. The wellhead device with anti-freezing and anti-blocking function for water-injection valve assembly according to claim 1, characterized in that, The fragment assembly includes: An annular box (9) is fixed inside the oil inlet pipe (2). The outer annular surface of the annular box (9) is connected to one end of the second connecting pipe (7). An annular through hole (10) is provided on the inner annular surface of the annular box (9). An annular sealing plate (11) is disposed inside the annular box (9), and the inner annular surface of the annular sealing plate (11) covers the annular through hole (10); The shaft tube (12) has one end connected to the free end of the first connecting tube (6) and the other end is fixed with a disc (13). The disc (13) has a hollow structure inside and is connected to the shaft tube (12). A driving component is disposed between the shaft tube (12) and the first connecting tube (6), and the driving component is connected to the shaft tube (12) in a transmission manner; Multiple fragment tubes (14) are disposed in the annular through hole (10). One end of each fragment tube (14) is fixedly connected to and communicates with the annular sealing plate (11), and the other end is fixedly connected to the outer surface of the disc (13) and communicates with the hollow structure.

4. A water-injection valve assembly wellhead device with anti-freezing and anti-blocking function according to claim 3, characterized in that, The driving component includes: The housing (15) is fixedly connected to and communicates with the free end of the first connecting pipe (6) at the center of one side. One end of the shaft pipe (12) passes through the center of the housing (15) and communicates with the free end of the first connecting pipe (6). The shaft pipe (12) is rotatably connected to the housing (15). The outer surface of the housing (15) is provided with an inlet pipe (16) and an outlet pipe (17) in a tangential direction. The free end of the inlet pipe (16) passes through the oil inlet pipe (2) and communicates with the diverter pipe (5). The free end of the outlet pipe (17) passes through the oil inlet pipe (2) and communicates with the second connecting pipe (7). An impeller (18) is disposed inside the housing (15). The impeller (18) is sleeved on the shaft tube (12) and fixedly connected. Both sides of the impeller (18) are fixedly provided with sealing discs (19) that fit against the inner wall of the housing (15).

5. A water-injection valve assembly wellhead device with anti-freezing and anti-blocking function according to claim 4, characterized in that, The oil inlet pipe (2) is provided with a second solenoid valve (20) on the outside, and the second solenoid valve (20) is installed on the liquid inlet pipe (16).

6. A water-injection valve assembly wellhead device with anti-freezing and anti-blocking function according to claim 1, characterized in that, The separation component includes: An intermediate plate (21) is disposed between the fragment assembly and the main valve body (1), and both ends of the intermediate plate (21) are fixedly connected to the inner wall of the oil inlet pipe (2). Two arc-shaped frames (22) are hinged to the two sides of the middle plate (21) respectively. The arc surface of each arc-shaped frame (22) is adapted to fit the inner wall of the oil inlet pipe (2). The shaft (23) of each arc-shaped frame (22) hinged to the middle plate (21) passes through the oil inlet pipe (2) and is connected to the fluid linkage assembly. Each arc-shaped frame (22) is fixedly connected to the corresponding shaft (23), and each arc-shaped frame (22) is equipped with a screen (24) inside.

7. A water-injection valve assembly wellhead device with anti-freezing and anti-blocking function according to claim 6, characterized in that, The screen (24) is made of heating wire. The arc frame (22) has a cavity at a location away from the middle plate (21). Inside the cavity, there is a connecting plate (25) and two guide rods (26). A convex shaft (27) is fixed on one side of the connecting plate (25), and the convex shaft (27) passes through the arc surface of the arc frame (22). A first conductive sheet (28) is fixed on the other side of the connecting plate (25). A second conductive sheet (26) is fixed on the side of the cavity near the first conductive sheet (28). Two conductive sheets (29), one end of the first conductive sheet (28) and the second conductive sheet (29) are electrically connected to the screen (24), each of the guide rods (26) is inserted on the connecting plate (25), both ends of each guide rod (26) are fixedly connected to the inner wall of the cavity, and each guide rod (26) is fitted with a spring (30), and both ends of each spring (30) abut against the side of the connecting plate (25) away from the convex shaft (27) and the inner wall of the cavity, respectively.

8. A water-injection valve assembly wellhead device with anti-freezing and anti-blocking function according to claim 6, characterized in that, The fluid linkage component includes: The third connecting pipe (31) has one end connected to the diversion pipe (5); A U-shaped tube (32) is fixed to the oil inlet pipe (2) by a bracket. A rectangular through hole is provided on the outer wall of the U-shaped tube (32). A connecting rod (33) is slidably connected inside the rectangular through hole. A rack (34) is fixed at one end of the connecting rod (33), and an arc-shaped sealing strip (35) is fixed at the other end. The arc-shaped sealing strip (35) is fitted inside the U-shaped tube (32) and covers the rectangular through hole. A piston (36) is fixed in the middle of the arc-shaped sealing strip (35), and an air outlet (37) is provided at one end of the U-shaped tube (32) near the rectangular through hole. A three-way solenoid valve (38) has one port connected to a drain pipe (39), and the other two ports are respectively connected to the free end of the third connecting pipe (31) and the end of the U-shaped pipe (32) away from the air outlet (37). Two gears (40) are respectively sleeved on the shaft (23) and fixedly connected. The two gears (40) are meshed together, and one of the gears (40) meshes with the rack (34).

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