A sand-proof fracturing wellhead device

Abstract

The present invention belongs to the technical field of oil extraction and provides a sand fracturing wellhead device, comprising a main pipe, a branch pipe connected to the side of the main pipe, a mounting ring slidably installed in the branch pipe, and a second telescopic member fixedly installed in the branch pipe to drive the mounting ring to move, the mounting ring and the branch pipe are coaxially arranged and the outer side of the mounting ring is in sliding contact with the inside of the branch pipe, a first filter is fixedly installed in the mounting ring, and a temporary storage box is provided on the branch pipe, the temporary storage box is located on the outside of the branch pipe and a storage box and a connecting groove are fixedly installed at both ends of the temporary storage box, and the connecting groove is connected to the branch pipe. Compared with the prior art, the beneficial effects of the present invention are as follows: impurities on the first filter screen will fall off the first filter screen due to speed reasons, and at the same time, the oil flowing into the connecting groove will drive the impurities that have fallen off the first filter screen into the temporary storage box, thereby achieving the cleaning of impurities on the first filter screen, and the cleaning of the first filter screen can be achieved without stopping the transportation of oil.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum extraction, and in particular relates to a sand-proof fracturing wellhead device. Background Art

[0002] In the process of oil field development, in order to increase the output of oil wells, fracturing technology measures are often adopted, that is, high-pressure fracturing vehicles and high-pressure manifold facilities are used to press fracturing sand into the formation through wellhead devices and high-pressure fracturing tubing.

[0003] During the extraction process, oil will be mixed with a large amount of sand. A large amount of sand will erode the inner wall of the device and reduce the service life of the device. Most of the fracturing wellhead devices currently used on the market generally filter the sand through a filter. For example, the Chinese patent with patent announcement number CN207526485U filters through a filter when in use and cleans it by vibration of the filter. However, since oil is always being transported, the sand impurities will always be pressed on the filter under the action of oil pressure, which has a poor cleaning effect on the filter and affects the filtering effect. Summary of the Invention

[0004] The purpose of the present invention is to provide a sand-proof fracturing wellhead device, aiming to solve the technical problem in the prior art that the filter screen cannot be cleaned during the oil transportation process, which affects the filtering effect.

[0005] and a tube connecting the dischar e side of the pump with a plug in the forward end of the crank case, said tube having a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, said tube having a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, said tube having a check valve in it at the pump end.

[0006] Further technical solution: the push plate matches the cross section of the temporary storage box, and the push plate contacts the second filter screen when it moves into the storage box.

[0007] Further technical solution: A connecting cavity is opened in the side wall of the mounting ring away from the connecting groove, and the connecting cavity is connected to multiple groups of evenly distributed oil injection pipes. The oil sprayed from the oil injection pipes flows along the surface of the first filter to the connecting groove. The oil injection pipes are located in the area where the unfiltered oil is located in the branch pipe, and an oil pump for transporting oil to the connecting cavity is fixedly installed on the branch pipe.

[0008] Further technical solution: the oil pump is connected to an oil supply pipe and an oil extraction pipe, the oil supply pipe is connected to the connecting cavity and the pipe located in the branch pipe is a hose, and the oil extraction pipe is connected to the area where the filtered oil is located in the branch pipe.

[0009] Further technical solution: A support plate located in the area where unfiltered oil is located in the branch pipe is fixedly installed on the side of the mounting ring, the support plate is located near the connecting groove of the mounting ring, a first vertical plate is fixedly installed on the support plate, a first slide plate is slidably installed on the first vertical plate, multiple groups of first rotating plates located in the area where unfiltered oil is located in the branch pipe are rotatably installed in the branch pipe, a first connecting plate is fixedly and rotatably installed on the first rotating plate, and an end of the first connecting plate away from the first rotating plate is fixedly connected to the first slide plate.

[0010] Further technical solution: The rotation axes of multiple groups of the first rotating plates are distributed in a plane parallel to the first filter screen. When the first rotating plates rotate to a state parallel to the first filter screen, their ends contact the inner wall of the branch pipe, and a gap is provided between two adjacent groups of first rotating plates. A group of first rotating plates close to the branch plate is spaced apart from the inner wall of the branch pipe.

[0011] Further technical solution: A first baffle is fixedly installed in the branch pipe, the support plate passes through the first baffle and the two are slidably connected. When the first rotating plate close to the support plate rotates to be parallel to the first filter screen, the side surface of the group of first rotating plates contacts the first baffle and closes the gap between the group of first rotating plates and the inner wall of the branch pipe.

[0012] Further technical solution: A second vertical plate is fixedly installed on the side of the mounting ring, the second vertical plate and the first vertical plate are located on both sides of the mounting ring, the second vertical plate is located on the side of the mounting ring away from the connecting groove, a second slide plate is slidably installed on the second vertical plate, and multiple groups of second rotating plates are rotatably installed in the branch pipe, located in the area where the oil is filtered in the branch pipe. The second rotating plates have the same structural arrangement as the first rotating plates, and a group of second rotating plates away from the connecting groove is spaced apart from the inner wall of the branch pipe.

[0013] Further technical solution: A second baffle is fixedly installed in the branch pipe. When the second rotating plate away from the connecting groove rotates to be parallel to the first filter screen, the side surface of the second rotating plate contacts the second baffle and closes the gap between the second rotating plate and the inner wall of the branch pipe.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The second telescopic member drives the mounting ring to move quickly toward the main pipe, exposing the connecting groove. At this time, the impurities on the first filter screen will separate from the first filter screen due to the speed. At the same time, the oil flowing into the connecting groove will drive the impurities separated from the first filter screen into the temporary storage box. Then, the first telescopic member drives the push plate to move toward the storage box. At this time, the push plate pushes the oil in the temporary storage box back to the branch pipe through the return pipe. The impurities returning to the branch pipe are filtered by the second filter screen to prevent the impurities from returning to the branch pipe, so that the impurities on the first filter screen can be temporarily separated, and the falling impurities are brought into the temporary storage box by the flowing oil. Then, the oil in the temporary box is refluxed and the impurities are separated, thereby realizing the cleaning of impurities on the first filter screen. The first filter screen can be cleaned without stopping the oil delivery, ensuring that the first filter screen is always in a clean state, thereby improving the oil filtering effect.

[0016] 2. The oil pump extracts the filtered oil through the oil extraction pipe and transports it to the connecting chamber. Under the action of pressure, the oil in the connecting chamber is ejected through the oil injection pipe. The ejected oil flows along the surface of the first filter to the connecting groove. When the connecting groove is in a closed state, the ejected high-speed flowing oil can push the impurities on the surface of the first filter to move and gather near the connecting groove. At the same time, the high-speed flowing oil can preliminarily clean the surface of the first filter. When the connecting groove is opened, the impurities that have escaped from the first filter can better enter the connecting groove under the action of the high-speed flowing oil, further improving the cleaning effect of the filter and improving the collection effect of impurities in the branch pipe.

[0017] 3. A blocking surface that is nearly a complete plane is formed by the first baffle and the first rotating plate. At the same time, a blocking surface that is nearly a complete plane is formed by the second rotating plate and the second baffle. The blocking surface formed by the first rotating plate is located on the side of the branch pipe close to the connecting groove, and the blocking surface formed by the second rotating plate is located on the side of the branch pipe away from the connecting groove. At this time, the oil can only pass through the first filter screen from the side away from the connecting groove and leave from the side close to the connecting groove, so that the oil can only flow from the side away from the connecting groove to the side close to the connecting groove between the blocking surfaces formed by the first rotating plate and the second rotating plate, thereby realizing directional flow of the oil. The directional flow of the oil can further clean the surface of the first filter screen and can further carry impurities into the connecting groove, thereby further improving the efficiency of impurities leaving the first filter screen and entering the connecting groove, further improving the cleaning effect of the first filter screen and the collection effect of impurities, and ensuring the filtering effect of the first filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure inside the branch pipe of the present invention from a first perspective.

[0020] Figure 3 This is a schematic structural diagram of the interior of the branch pipe from a second perspective in the present invention.

[0021] Figure 4 It is a schematic cross-sectional structural diagram of the present invention.

[0022] Figure 5 for Figure 4 Schematic diagram of the enlarged A1 region.

[0023] Figure 6 for Figure 4 A magnified schematic diagram of the A2 region in the middle.

[0024] Figure 7 for Figure 4 Schematic diagram of the enlarged A3 region.

[0025] Figure 8 for Figure 4 Schematic diagram of the enlarged A4 area.

[0026] In the accompanying drawings: 1. main pipe; 2. branch pipe; 3. mounting ring; 4. first filter; 5. connecting chamber; 6. fuel injection pipe; 7. oil pump; 8. fuel supply pipe; 9. oil extraction pipe; 10. temporary storage box; 11. storage box; 12. connecting groove; 13. oil return pipe; 14. second filter; 15. first telescopic member; 16. push plate; 17. discharge pipe; 18. support plate; 19. first baffle; 20. first vertical plate; 21. first slide plate; 22. first connecting plate; 23. first rotating plate; 24. second vertical plate; 25. second slide plate; 26. second connecting plate; 27. second rotating plate; 28. second baffle; 29. ​​second telescopic member. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0029] like Figures 1-8As shown, a sand fracturing wellhead device provided by the present invention includes a main pipe 1, a branch pipe 2 is connected to the side of the main pipe 1, a mounting ring 3 is slidably installed in the branch pipe 2, and a second telescopic member 29 that drives the mounting ring 3 to move is fixedly installed in the branch pipe 2, the mounting ring 3 and the branch pipe 2 are coaxially arranged, and the outer side of the mounting ring 3 is in sliding contact with the inside of the branch pipe 2, a first filter screen 4 is fixedly installed in the mounting ring 3, a temporary storage box 10 is provided on the branch pipe 2, the temporary storage box 10 is located outside the branch pipe 2, and a storage box 11 and a connecting groove 12 are fixedly installed at both ends of the temporary storage box 10, the connecting groove 12 is connected to the branch pipe 2, and the mounting ring 3 is located at the initial When in the position, the communication area between the communication groove 12 and the branch pipe 2 is blocked. The storage box 11 is connected with a return oil pipe 13, and the return oil pipe 13 is connected to the area where the unfiltered oil is located in the branch pipe 2. A one-way valve is fixedly installed on the return oil pipe 13. A second filter screen 14 is fixedly installed at the position where the return oil pipe 13 is connected to the storage box 11. The storage box 11 is connected with a discharge pipe 17. A push plate 16 is slidably installed in the temporary storage box 10 and a first telescopic member 15 that drives the push plate 16 to move is fixedly installed on the temporary storage box 10. The cross-section of the push plate 16 matches that of the temporary storage box 10. When the push plate 16 moves into the storage box 11, it contacts the second filter screen 14.

[0030] When the oil enters the branch pipe 2, it is filtered through the first filter screen 4. The filtered oil enters the main pipe 1 and continues to be transported. After a set time, the second telescopic member 29 drives the mounting ring 3 to move rapidly toward the main pipe 1, so that the connecting groove 12 is exposed. Since the temporary storage box 10 is empty, the oil near the first filter screen 4 in the branch pipe 2 will flow into the temporary storage box 10 through the connecting groove 12. Due to the rapid movement of the mounting ring 3, the impurities on the first filter screen 4 will break away from the first filter screen 4 due to the speed. At the same time, the oil flowing into the connecting groove 12 will drive the impurities that have broken away from the first filter screen 4 into the temporary storage box 10. After a set time, the temporary storage box 10 is filled with oil. At this time, the mounting ring 3 returns to its original position to close the connecting groove 12, and the first telescopic member 15 drives the mounting ring 3 to move rapidly toward the main pipe 1. The plate 16 moves toward the storage box 11. At this time, the push plate 16 pushes the oil in the temporary storage box 10 back to the branch pipe 2 through the return oil pipe 13, and filters the impurities that flow back into the branch pipe 2 through the second filter screen 14 to prevent the impurities from returning to the branch pipe 2. At the same time, after the push plate 16 moves to the top of the storage box 11, it will scrape and clean the second filter screen 14. Under the action of the push plate 16, the impurities in the temporary storage box 10 are moved to the top of the storage box 11 and finally dropped into the storage box 11. After that, the push plate 16 is reset. The floating operation is repeated continuously, so that the impurities on the first filter 4 can be temporarily detached, and the detached impurities are brought into the temporary storage box 10 by the flowing oil. After that, the oil in the temporary storage box 10 is refluxed and the impurities are separated, thereby realizing the cleaning of the impurities on the first filter 4. The cleaning of the first filter 4 can be realized without stopping the transportation of oil, thereby ensuring that the first filter 4 is always in a clean state and improving the filtering effect of oil. After long-term use, the valve on the discharge pipe 17 is opened to allow the oil in the storage box 11 to flow out with impurities.

[0031] In an example of this embodiment, the first telescopic member 15 and the second telescopic member 29 are respectively the first electric telescopic rod and the second electric telescopic rod. Of course, they can also be other components that can actively change the length, such as hydraulic cylinders. The push plate 16 is driven to move by the first electric telescopic rod, and the mounting ring 3 is driven to move by the second electric telescopic rod.

[0032] like Figures 1-4 As shown, a sand control fracturing wellhead device provided by the present invention is provided. A connecting cavity 5 is opened in the side wall of the mounting ring 3 away from the connecting groove 12. The connecting cavity 5 is connected to a plurality of evenly distributed oil injection pipes 6. The oil sprayed from the oil injection pipes 6 flows along the surface of the first filter 4 to the connecting groove 12. The oil injection pipes 6 are located in the area where the unfiltered oil is located in the branch pipe 2. An oil pump 7 for transporting oil to the connecting cavity 5 is fixedly installed on the branch pipe 2.

[0033] Specifically, the oil pump 7 is connected to an oil supply pipe 8 and an oil extraction pipe 9. The oil supply pipe 8 is connected to the communication cavity 5 and the pipeline located in the branch pipe 2 is a hose. The oil extraction pipe 9 is connected to the area in the branch pipe 2 where the filtered oil is located.

[0034] In actual application of this embodiment, the oil pump 7 extracts the filtered oil through the oil extraction pipe 9 and transports it to the connecting chamber 5. Under the action of pressure, the oil in the connecting chamber 5 is ejected through the oil injection pipe 6. The ejected oil flows along the surface of the first filter 4 to the connecting groove 12. When the connecting groove 12 is in a closed state, the ejected high-speed flowing oil can push the impurities on the surface of the first filter 4 to move and gather near the connecting groove 12. At the same time, the high-speed flowing oil can preliminarily clean the surface of the first filter 4. When the connecting groove 12 is opened, the impurities that have escaped from the first filter 4 can better enter the connecting groove 12 under the action of the high-speed flowing oil, further improving the cleaning effect of the first filter 4 and improving the collection effect of impurities in the branch pipe 2.

[0035] like Figures 1-8 As shown, a sand control and fracturing wellhead device provided by the present invention is provided. A support plate 18 located in the area where unfiltered oil is located in the branch pipe 2 is fixedly installed on the side of the mounting ring 3. The support plate 18 is located near the connecting groove 12 of the mounting ring 3. A first vertical plate 20 is fixedly installed on the support plate 18. A first slide plate 21 is slidably installed on the first vertical plate 20. Multiple groups of first rotating plates 23 located in the area where unfiltered oil is located in the branch pipe 2 are rotatably installed in the branch pipe 2. A first connecting plate 22 is fixedly and rotatably installed on the first rotating plate 23. The end of the first connecting plate 22 away from the first rotating plate 23 is fixedly connected to the first slide plate 21.

[0036] Specifically, the rotation axes of multiple groups of first rotating plates 23 are distributed in a plane parallel to the first filter screen 4. When the first rotating plates 23 rotate to a state parallel to the first filter screen 4, their ends contact the inner wall of the branch pipe 2, and a gap is provided between two adjacent groups of first rotating plates 23. A group of first rotating plates 23 close to the support plate 18 is spaced apart from the inner wall of the branch pipe 2.

[0037] Specifically, a first baffle 19 is fixedly installed in the branch pipe 2, and the support plate 18 passes through the first baffle 19 and the two are slidably connected. When the first rotating plate 23 close to the support plate 18 rotates to be parallel to the first filter screen 4, the side surfaces of the group of first rotating plates 23 contact the first baffle 19 and close the gap between the group of first rotating plates 23 and the inner wall of the branch pipe 2.

[0038] Specifically, a second vertical plate 24 is fixedly installed on the side of the mounting ring 3. The second vertical plate 24 and the first vertical plate 20 are located on both sides of the mounting ring 3. The second vertical plate 24 is located on the side of the mounting ring 3 away from the connecting groove 12. A second slide plate 25 is slidably installed on the second vertical plate 24. A plurality of groups of second rotating plates 27 are rotatably installed in the branch pipe 2 and are located in the area where the oil is filtered in the branch pipe 2. The second rotating plates 27 have the same structural arrangement as the first rotating plates 23. A group of second rotating plates 27 away from the connecting groove 12 is spaced apart from the inner wall of the branch pipe 2.

[0039] Specifically, a second baffle 28 is fixedly installed in the branch pipe 2. When the second rotating plate 27 away from the connecting groove 12 rotates to be parallel to the first filter screen 4, the side surfaces of the group of second rotating plates 27 contact the second baffle 28 and close the gap between the group of second rotating plates 27 and the inner wall of the branch pipe 2.

[0040] In actual application of this embodiment, in the initial state, the multiple groups of first rotating plates 23 and the multiple groups of second rotating plates 27 are all in a state of being inclined close to the horizontal plane, and the oil can pass between the first rotating plates 23 and the second rotating plates 27, reducing the obstruction to the flow of oil. When the mounting ring 3 moves toward the direction close to the main pipe 1, the mounting ring 3 drives the first vertical plate 20 to move toward the direction close to the mounting ring 3 through the support plate 18, and then the first vertical plate 20 can push the first rotating plate 23 to rotate through the first slide plate 21 and the first connecting plate 22, and the first rotating plate The rotation axis of 23 is located at one end thereof close to the mounting ring 3. When the mounting ring 3 moves to the set position, the multiple sets of first rotating plates 23 are all rotated to a state parallel to the first filter screen 4. There is only a narrow gap between the first rotating plates 23 for the first rotating plates 23 to rotate, and the end of the first rotating plate 23 contacts the inner wall of the branch pipe 2. The first baffle 19 also contacts the first rotating plate 23, and a blocking surface close to a complete plane is formed by the first baffle 19 and the first rotating plate 23. At the same time, when the mounting ring 3 moves, the second vertical plate 24 and the second slide plate 2 5. The second connecting plate 26 drives the second rotating plate 27 to rotate, so that the second rotating plate 27 and the second baffle 28 form an obstruction surface that is close to a complete plane. The obstruction surface formed by the first rotating plate 23 is located on the side of the branch pipe 2 close to the connecting groove 12, and the obstruction surface formed by the second rotating plate 27 is located on the side of the branch pipe 2 far from the connecting groove 12. At this time, the oil can only pass through the first filter screen 4 from the side far from the connecting groove 12 and leave from the side close to the connecting groove 12, so that the oil can only flow from the side far from the connecting groove 12 to the side close to the connecting groove 12 between the obstruction surfaces formed by the first rotating plate 23 and the second rotating plate 27, thereby realizing directional flow of the oil. The directional flow of the oil can further clean the surface of the first filter screen 4, and at the same time can further carry impurities into the connecting groove 12, further improving the efficiency of impurities leaving the first filter screen 4 and entering the connecting groove 12, further improving the cleaning effect of the first filter screen 4 and the collection effect of impurities, thereby ensuring the filtering effect of the first filter screen 4. Subsequently, the installation ring 3 is reset to restore the first rotating plate 23 and the second rotating plate 27, so that the oil flows smoothly.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0042] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A sand control fracturing wellhead device, comprising a main pipe (1), characterized in that: The main pipe (1) is connected to the branch pipe (2) on its side, a mounting ring (3) is slidably mounted in the branch pipe (2), and a second telescopic member (29) is fixedly mounted in the branch pipe (2) for driving the mounting ring (3) to move, the mounting ring (3) and the branch pipe (2) are coaxially arranged, and the outer side of the mounting ring (3) is in sliding contact with the inside of the branch pipe (2), a first filter (4) is fixedly mounted in the mounting ring (3), a temporary storage box (10) is provided on the branch pipe (2), the temporary storage box (10) is located outside the branch pipe (2), and a storage box (11) and a connecting groove (12) are fixedly mounted at both ends of the temporary storage box (10), the connecting groove (12) and the branch pipe ( 2) communication, the mounting ring (3) blocks the communication area between the communication groove (12) and the branch pipe (2) when it is in the initial position, the storage box (11) is connected with a return oil pipe (13), the return oil pipe (13) is connected with the area where the unfiltered oil in the branch pipe (2) is located, a one-way valve is fixedly installed on the return oil pipe (13), a second filter (14) is fixedly installed at the position where the return oil pipe (13) is connected to the storage box (11), the storage box (11) is connected with a discharge pipe (17), a push plate (16) is slidably installed in the temporary storage box (10), and a first telescopic member (15) for driving the push plate (16) to move is fixedly installed on the temporary storage box (10); A connecting cavity (5) is formed in the side wall of the mounting ring (3) away from the connecting groove (12). The connecting cavity (5) is connected to a plurality of evenly distributed oil injection pipes (6). The oil sprayed from the oil injection pipes (6) flows along the surface of the first filter (4) to the connecting groove (12). The oil injection pipes (6) are located in the area where the unfiltered oil is located in the branch pipe (2). An oil pump (7) for delivering oil to the connecting cavity (5) is fixedly installed on the branch pipe (2); A support plate (18) located in the area where unfiltered oil is located in the branch pipe (2) is fixedly installed on the side of the mounting ring (3). The support plate (18) is located near the connecting groove (12) of the mounting ring (3). A first vertical plate (20) is fixedly installed on the support plate (18). A first slide plate (21) is slidably installed on the first vertical plate (20). Multiple groups of first rotating plates (23) located in the area where unfiltered oil is located in the branch pipe (2) are rotatably installed in the branch pipe (2). A first connecting plate (22) is fixedly and rotatably installed on the first rotating plate (23). One end of the first connecting plate (22) away from the first rotating plate (23) is fixedly connected to the first slide plate (21).

2. A sand control fracturing wellhead device according to claim 1, characterized in that: The push plate (16) matches the cross section of the temporary storage box (10), and the push plate (16) contacts the second filter screen (14) when it moves into the storage box (11).

3. The sand control fracturing wellhead device according to claim 1, characterized in that: The oil pump (7) is connected to an oil supply pipe (8) and an oil extraction pipe (9), the oil supply pipe (8) is connected to the communication cavity (5), and the oil supply pipe (8) is located in the branch pipe (2) as a hose, and the oil extraction pipe (9) is connected to the area where the filtered oil is located in the branch pipe (2).

4. The sand control fracturing wellhead device according to claim 1, characterized in that: The rotation axes of the plurality of groups of the first rotating plates (23) are located in a plane parallel to the first filter screen (4). When the first rotating plates (23) rotate to a state parallel to the first filter screen (4), their ends contact the inner wall of the branch pipe (2), and a gap is provided between two adjacent groups of the first rotating plates (23). A gap is provided between the group of first rotating plates (23) close to the support plate (18) and the inner wall of the branch pipe (2).

5. The sand control fracturing wellhead device according to claim 4, characterized in that: A first baffle (19) is fixedly installed in the branch pipe (2), the support plate (18) passes through the first baffle (19) and the two are slidably connected. When the first rotating plate (23) close to the support plate (18) rotates to be parallel to the first filter screen (4), the side surface of the group of first rotating plates (23) contacts the first baffle (19) and closes the gap between the group of first rotating plates (23) and the inner wall of the branch pipe (2).

6. The sand control fracturing wellhead device according to claim 1, characterized in that: A second vertical plate (24) is fixedly mounted on the side of the mounting ring (3). The second vertical plate (24) and the first vertical plate (20) are located on both sides of the mounting ring (3). The second vertical plate (24) is located on a side of the mounting ring (3) away from the connecting groove (12). A second slide plate (25) is slidably mounted on the second vertical plate (24). Multiple groups of second rotating plates (27) located in the oil filtering area of ​​the branch pipe (2) are rotatably mounted in the branch pipe (2). The second rotating plates (27) have the same structural arrangement as the first rotating plates (23). A group of second rotating plates (27) away from the connecting groove (12) is spaced from the inner wall of the branch pipe (2).

7. The sand control fracturing wellhead device according to claim 6, characterized in that: A second baffle (28) is fixedly installed in the branch pipe (2). When the second rotating plate (27) away from the connecting groove (12) rotates to be parallel to the first filter screen (4), the side surface of the second rotating plate (27) contacts the second baffle (28) and closes the gap between the second rotating plate (27) and the inner wall of the branch pipe (2).

Images