An automatically detectable water injection wellhead device

Abstract

This invention provides an automatically detectable water injection wellhead device for oil production, relating to the field of water injection technology. It includes a wellhead pipeline, a water injection pipe mounted on the sidewall of the wellhead pipeline, and a water injection assembly at the end of the water injection pipe furthest from the wellhead pipeline. The water injection assembly includes a filter pipe with a sealing seat at its lower end. One end of an inlet pipe is connected to the upper part of the filter pipe, and one end of an outlet pipe is connected to the lower part of the filter pipe. A filter screen is installed at the connection between the outlet pipe and the filter pipe. The other end of the outlet pipe is connected to the water injection pipe. A first pressure sensor is installed inside the inlet pipe, and a second pressure sensor is installed inside the outlet pipe. An alarm and a controller are installed outside the outlet pipe. In this invention, the controller has a preset pressure difference threshold for filter clogging. When the difference between the fluid pressure in the inlet pipe and the fluid pressure in the outlet pipe exceeds the pressure difference threshold, the controller determines that the filter is clogged and sends an alarm to the on-site maintenance personnel via the alarm for timely handling.

Description

Technical Field

[0001] This invention relates to the field of water injection technology in oil production, and in particular to an automatic detection device for water injection wellheads in oil production. Background Technology

[0002] Water injection is an oilfield development technique that involves injecting purified water into the reservoir to maintain formation pressure and improve oil recovery. It is primarily suitable for reservoirs with insufficient energy or for replenishing formation energy in the later stages of development. In actual operations, the injected water often carries formation impurities (such as silt and rock cuttings) or particulate matter remaining from surface treatment. If these impurities enter the reservoir with the fluid, they can not only clog formation pores and reduce permeability, but also wear down wellhead pipelines, pumps, and other equipment. Therefore, filters must be installed in the water injection process to intercept impurities and ensure the quality of the injected water and the stable operation of the system.

[0003] For example, Chinese patent CN120789955B discloses a water injection device for oil wellheads, including a mixing tank. The inlet of the mixing tank is connected to an inlet pipe and a first auxiliary pipe. The mixing tank is provided with a mixing chamber and a narrowing chamber from top to bottom. A conical bucket is fixedly connected in the mixing chamber. Several first through grooves are opened on the inner wall of the narrowing chamber. The inlet pipe is connected to the inlet of the filter through a second auxiliary pipe. The other end of the first auxiliary pipe is connected to the outlet of the filter. The outlet of the filter is connected to an outlet pipe. The outlet pipe is connected to the inlet of the filter through a third auxiliary pipe. The mixing tank is provided with a chemical dosing mechanism and a self-mixing mechanism. It realizes automatic mixing of chemicals when flowing, relying entirely on the kinetic energy of the fluid to drive the spiral vortex. The flexible switching of three modes can adapt to the addition requirements of different agents, improving the targeting and efficiency of water injection in oil production.

[0004] However, the filters in the aforementioned water injection devices are fixed in place. Although they can intercept impurities through the filter screen, impurities tend to accumulate at the filter screen, causing blockage problems. When the filter screen is blocked, since there are no automatic detection components in the water injection device, the blockage status is determined entirely by manual inspection. Manual inspection is periodic, and the problem is often only discovered after the blockage has caused a sharp drop in water injection volume and abnormal system pressure, missing the opportunity for early cleaning and making it impossible to clean the filter screen in time. Furthermore, once the blockage is confirmed, manual shutdown and disassembly are required, which is not only time-consuming but also interrupts the water injection operation, leading to a decrease in oil production efficiency. Summary of the Invention

[0005] This invention provides an automatic detection device for water injection wellheads, which solves the technical problem that current water injection devices do not have automatic detection components when the filter screen is clogged, and rely entirely on manual inspection to determine the clogging status of the filter screen, making it impossible to clean the filter screen in a timely manner.

[0006] To solve the above-mentioned technical problems, the present invention discloses an automatic detection water injection oil wellhead device, comprising: a wellhead pipe, a water injection pipe installed on the side wall of the wellhead pipe, a water injection assembly installed at the end of the water injection pipe away from the wellhead pipe, the water injection assembly including a filter pipe, an inlet pipe and an outlet pipe, a sealing seat installed at the lower end of the filter pipe, one end of the inlet pipe connected to the upper part of the filter pipe, one end of the outlet pipe connected to the lower part of the filter pipe, a filter screen installed at the connection between the outlet pipe and the filter pipe, the other end of the outlet pipe connected to the water injection pipe, a first pressure sensor installed inside the inlet pipe, a second pressure sensor installed inside the outlet pipe, an alarm and a controller installed outside the outlet pipe, the controller being electrically connected to the first pressure sensor, the second pressure sensor and the alarm respectively.

[0007] Preferably, a cleaning mechanism is provided inside the filter pipe. The cleaning mechanism includes a screw and a cleaning plate. The upper end of the screw is rotatably connected to the inner wall of the upper end of the filter pipe. A threaded hole is provided in the center of the cleaning plate. The cleaning plate is threadedly connected to the outer wall of the screw through the threaded hole. A slider is provided on the outer wall of the cleaning plate. A groove corresponding to the slider is provided on the inner wall of the filter pipe. The groove is vertically set. The slider is slidably connected to the inner wall of the groove. A first motor is provided at the top of the filter pipe. The first motor is electrically connected to the controller. The output end of the first motor is connected to the upper end of the screw.

[0008] Preferably, the cleaning plate is frustum-shaped, and the diameter of the lower end of the cleaning plate is smaller than the diameter of the upper end of the cleaning plate.

[0009] Preferably, the cleaning plate has several vertically penetrating water outlets, which are arranged vertically.

[0010] Preferably, a cleaning ring is fixedly installed on the inner wall of the upper end of the filter pipe, the center of the cleaning ring is rotatably connected to the outer wall of the screw, and a number of cleaning rods are installed on the lower surface of the cleaning ring, with each cleaning rod corresponding to a water outlet hole, and the diameter of the cleaning rod is smaller than the diameter of the water outlet hole.

[0011] Preferably, the upper surface of the sealing seat is provided with a guide hole, the inner wall of the guide hole is adapted to the outer wall of the cleaning plate, a proximity sensor is provided in the guide hole, and the proximity sensor is electrically connected to the controller. The sealing seat is provided with a rotating cavity, which is spherical in shape. The rotating cavity is connected to the lower end of the guide hole through a connecting hole, and the bottom of the rotating cavity is connected to the lower part of the sealing seat through a debris discharge hole. A cleaning ball is provided in the rotating cavity, and a storage hole is provided in the cleaning ball. The upper end of the storage hole is connected to the lower end of the connecting hole. A second motor is provided on the outer wall of the sealing seat, and the second motor is electrically connected to the controller. A first rotating hole is provided in the sealing seat, and a first rotating shaft is provided in the first rotating hole. One end of the first rotating shaft is connected to the output end of the second motor, and the other end of the first rotating shaft is connected to the center position of the outer wall of the cleaning ball.

[0012] Preferably, a support plate is horizontally installed inside the connecting hole, the cross-sectional area of ​​the support plate is smaller than that of the connecting hole, the front and rear ends of the support plate are fixedly connected to the front and rear sides of the connecting hole respectively, and the lower end of the screw is rotatably connected to the upper surface of the support plate.

[0013] Preferably, guide plates are symmetrically arranged on the front and rear sides of the support plate, and the longitudinal cross-section of the guide plates is triangular.

[0014] Preferably, a mounting shell is provided on the side of the sealing seat away from the second motor, and a through groove is provided at the bottom of the mounting shell. A second rotating hole is provided on the side of the rotating cavity away from the first rotating hole. A second rotating shaft is provided in the second rotating hole. One end of the second rotating shaft is connected to the outer wall of the cleaning ball, and the other end of the second rotating shaft extends into the mounting shell and is provided with a first bevel gear. A third rotating shaft is provided in the mounting shell. The third rotating shaft is perpendicular to the second rotating shaft. The front and rear ends of the third rotating shaft are rotatably connected to the inner wall of the mounting shell, respectively. A second bevel gear and a drive gear are provided on the third rotating shaft. The second bevel gear meshes with the first bevel gear. A sealing plate is provided at the bottom of the sealing seat. The sealing plate is used to seal the discharge hole. The upper surface of the sealing plate is slidably connected to the bottom wall of the sealing seat. A rack is provided at the end of the sealing plate near the mounting shell. The upper surface of the rack meshes with the lower side of the drive gear.

[0015] Preferably, a guide hole is horizontally provided in the sealing seat, and a guide rod is slidably provided in the guide hole. The guide rod is parallel to the rack, and one end of the guide rod extends to the outside of the guide hole and is provided with a connecting block. The connecting block is connected to the upper surface of the rack. The connecting block and the drive gear are not on the same vertical plane. A connecting spring is provided in the guide hole. One end of the connecting spring is connected to the inner wall of the guide hole, and the other end of the connecting spring is connected to the end of the guide rod away from the connecting block.

[0016] The technical solution of this invention has the following advantages: This invention provides an automatically detectable water injection wellhead device for oil production, relating to the field of water injection technology for oil production. It includes a wellhead pipeline, a water injection pipe installed on the side wall of the wellhead pipeline, and a water injection assembly installed at the end of the water injection pipe furthest from the wellhead pipeline. The water injection assembly includes a filter pipe, a sealing seat installed at the lower end of the filter pipe, an inlet pipe connected to the upper part of the filter pipe at one end, and an outlet pipe connected to the lower part of the filter pipe at one end. A filter screen is installed at the connection between the outlet pipe and the filter pipe. The other end of the outlet pipe is connected to the water injection pipe. A first pressure sensor is installed inside the inlet pipe, a second pressure sensor is installed inside the outlet pipe, and an alarm and controller are installed outside the outlet pipe. In this invention, the controller has a preset pressure difference threshold for filter screen blockage. When the difference between the fluid pressure in the inlet pipe and the fluid pressure in the outlet pipe exceeds the pressure difference threshold, the controller determines that the filter screen is blocked and sends an alarm notification to the on-site maintenance personnel via the alarm for timely handling.

[0017] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the means particularly pointed out in the written description and the accompanying drawings.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the internal structure of a water injection oil wellhead device capable of automatic detection according to the present invention. Figure 2 This is a schematic diagram of the overall structure of a water injection oil wellhead device capable of automatic detection according to the present invention. Figure 3 For the present invention Figure 1 Enlarged view of the structure at point A in the middle; Figure 4 For the present invention Figure 1 Enlarged view of the structure at point B in the middle; Figure 5 This is a schematic diagram of the internal structure of the sealing seat in this invention; Figure 6 For the present invention Figure 5 Enlarged view of the structure at point C.

[0020] In the diagram: 1. Wellhead pipe; 2. Injection pipe; 3. Filter pipe; 4. Inlet pipe; 5. Outlet pipe; 6. Sealing seat; 7. Filter screen; 8. Screw; 9. Cleaning plate; 10. First motor; 11. Outlet hole; 12. Cleaning ring; 13. Cleaning rod; 14. Guide hole; 15. Rotating cavity; 16. Connecting hole; 17. Impurity discharge hole; 18. Cleaning ball; 19. Storage hole; 20. Second motor; 21. First rotating shaft; 22. Support plate; 23. Guide plate; 24. Mounting shell; 25. Second rotating shaft; 26. First bevel gear; 27. Third rotating shaft; 28. Second bevel gear; 29. ​​Drive gear; 30. Sealing plate; 31. Rack; 32. Guide hole; 33. Guide rod; 34. Connecting block; 35. Connecting spring. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] Example 1: This embodiment of the invention provides an automatic detection device for water injection oil wellheads, such as... Figures 1-6 As shown, it includes: a wellhead pipe 1, a water injection pipe 2 installed on the side wall of the wellhead pipe 1, a water injection assembly installed at the end of the water injection pipe 2 away from the wellhead pipe 1, the water injection assembly including a filter pipe 3, an inlet pipe 4 and an outlet pipe 5, a sealing seat 6 installed at the lower end of the filter pipe 3, one end of the inlet pipe 4 connected to the upper part of the filter pipe 3, one end of the outlet pipe 5 connected to the lower part of the filter pipe 3, a filter screen 7 installed at the connection position between the outlet pipe 5 and the filter pipe 3, the other end of the outlet pipe 5 connected to the water injection pipe 2, a first pressure sensor installed inside the inlet pipe 4, a second pressure sensor installed inside the outlet pipe 5, an alarm and a controller installed outside the outlet pipe 5, the controller being electrically connected to the first pressure sensor, the second pressure sensor and the alarm respectively.

[0024] The working principle and beneficial effects of the above technical solution are as follows: During water injection, the high-pressure water to be injected first flows into the filter pipe 3 through the inlet pipe 4. When the high-pressure water flows through the filter screen 7, the filter screen 7 can intercept impurities such as mud, sand, and rock fragments in the high-pressure water. The filtered clean high-pressure water flows into the outlet pipe 5 and finally into the wellhead pipe 1 through the injection pipe 2. A first pressure sensor is installed in the inlet pipe 4, which can automatically and continuously detect the fluid pressure in the inlet pipe 4. At the same time, a second pressure sensor in the outlet pipe 5 can automatically and continuously detect the fluid pressure in the outlet pipe 5. The first pressure sensor and the second pressure sensor will detect the fluid pressure. The result is converted into an electrical signal and continuously transmitted to the controller. The controller has a preset pressure difference threshold for filter 7 blockage. The pressure difference threshold can be set according to the actual situation on site. When the difference between the fluid pressure in the inlet pipe 4 and the fluid pressure in the outlet pipe 5 is greater than the pressure difference threshold, it indicates that filter 7 is severely blocked. At this time, the controller determines that filter 7 is blocked and sends an alarm to the on-site maintenance personnel through the alarm so that they can deal with it in time. The maintenance personnel can clean filter 7 in time. The first pressure sensor and the second pressure sensor realize the automatic detection of the filter 7 blockage status, reducing the daily inspection workload of the staff and reducing labor costs.

[0025] Example 2: Based on Example 1 above, as follows Figures 1-3 As shown, a cleaning mechanism is installed inside the filter pipe 3. The cleaning mechanism includes a screw 8 and a cleaning plate 9. The upper end of the screw 8 is rotatably connected to the inner wall of the upper end of the filter pipe 3. A threaded hole is provided in the center of the cleaning plate 9. The cleaning plate 9 is threadedly connected to the outer wall of the screw 8 through the threaded hole. A slider is provided on the outer wall of the cleaning plate 9. A groove corresponding to the slider is provided on the inner wall of the filter pipe 3. The groove is vertically set. The slider is slidably connected to the inner wall of the groove. A first motor 10 is provided at the top of the filter pipe 3. The first motor 10 is electrically connected to the controller. The output end of the first motor 10 is connected to the upper end of the screw 8. The cleaning plate 9 is shaped like a frustum, and the diameter of the lower end of the cleaning plate 9 is smaller than the diameter of the upper end of the cleaning plate 9. The cleaning plate 9 is provided with several vertically penetrating water outlet holes 11, which are vertically arranged. A cleaning ring 12 is fixedly installed on the inner wall of the upper end of the filter pipe 3. The center of the cleaning ring 12 is rotatably connected to the outer wall of the screw 8. Several cleaning rods 13 are installed on the lower surface of the cleaning ring 12. Each cleaning rod 13 corresponds to a water outlet 11. The diameter of the cleaning rod 13 is smaller than the diameter of the water outlet 11.

[0026] The working principle and beneficial effects of the above technical solution are as follows: When the controller determines that the filter screen 7 needs cleaning based on the difference between the values ​​detected by the first pressure sensor and the second pressure sensor exceeding the pressure difference threshold, the controller can send a start signal to the first motor 10. The first motor 10 is a forward and reverse motor. The start of the first motor 10 can drive the screw 8 to rotate forward. The rotation of the screw 8 drives the cleaning plate 9 to slide downward along the inner wall of the filter pipe 3. The outer wall of the cleaning plate 9 is in contact with the inner wall of the filter pipe 3. During the downward movement of the cleaning plate 9, it can scrape off the impurities attached to the inner wall of the filter pipe 3. When the cleaning plate 9 passes the filter screen 7, it can scrape off the impurities attached to the surface of the filter screen 7. Under the action of the cleaning plate 9, the fallen impurities are pushed to the sealing seat 6 at the bottom of the filter pipe 3, realizing automatic cleaning of the surface of the filter screen 7. After a single cleaning is completed, the controller controls the first motor 10 to reverse, and the screw 8 reverses to drive the cleaning plate 9 to slide upward. The cleaning plate 9 is equipped with several water outlet holes 11. During the movement of the cleaning plate 9, the high-pressure water flowing in from the water inlet pipe 4 can flow through the water outlet holes 11 to the bottom of the cleaning plate 9, thus ensuring the continuity of water injection. When the cleaning plate 9 slides upward and approaches the cleaning ring 12, the cleaning rod 13 set at the bottom of the cleaning ring 12 can be inserted into the corresponding water outlet hole 11 to unclog the water outlet hole 11 and prevent the water outlet hole 11 from becoming blocked. When the cleaning plate 9 returns to its original position, the height of the cleaning plate 9 is higher than the height of the water inlet pipe 4, so it will not interfere with the water inlet. Through the above scheme, the automatic cleaning of the filter screen 7 can be achieved. Compared with the existing device, which requires manual shutdown and disassembly for cleaning, the cleaning efficiency is greatly improved and the number of manual maintenance is reduced. Moreover, during the entire cleaning process, the high-pressure water flowing in through the water inlet pipe 4 can still flow through the filter pipe 3 to the water outlet pipe 5. The cleaning process does not require stopping the machine, ensuring the continuity of water injection operation.

[0027] Example 3: Based on Example 2, such as Figures 1-4 As shown, the upper surface of the sealing seat 6 is provided with a guide hole 14. The inner wall of the guide hole 14 is adapted to the outer wall of the cleaning plate 9. A proximity sensor is provided in the guide hole 14 and is electrically connected to the controller. The sealing seat 6 is provided with a rotating cavity 15. The rotating cavity 15 has a spherical structure. The rotating cavity 15 is connected to the lower end of the guide hole 14 through a connecting hole 16. The bottom of the rotating cavity 15 is connected to the lower part of the sealing seat 6 through a waste discharge hole 17. A cleaning ball 18 is provided in the rotating cavity 15. A storage hole 19 is provided in the cleaning ball 18. The upper end of the storage hole 19 is connected to the lower end of the connecting hole 16. A second motor 20 is provided on the outer wall of the sealing seat 6 and is electrically connected to the controller. A first rotating hole is provided in the sealing seat 6. A first rotating shaft 21 is provided in the first rotating hole. One end of the first rotating shaft 21 is connected to the output end of the second motor 20, and the other end of the first rotating shaft 21 is connected to the center position of the outer wall of the cleaning ball 18. A horizontal support plate 22 is installed inside the connecting hole 16. The cross-sectional area of ​​the support plate 22 is smaller than that of the connecting hole 16. The front and rear ends of the support plate 22 are fixedly connected to the front and rear sides of the connecting hole 16, respectively. The lower end of the screw 8 is rotatably connected to the upper surface of the support plate 22. The front and rear sides of the support plate 22 are symmetrically provided with guide plates 23, and the longitudinal section of the guide plates 23 is triangular.

[0028] The working principle and beneficial effects of the above technical solution are as follows: Initially, the upper end of the storage hole 19 of the cleaning ball 18 is connected to the lower end of the connecting hole 16 through an opening. Under the sealing effect of the cleaning ball 18, the high-pressure water in the filter pipe 3 is not easy to flow out from the discharge hole 17. During the cleaning process, the cleaning plate 9 moves downward along the inner wall of the filter pipe 3 under the drive of the first motor 10 and gradually approaches the guide hole 14 on the upper surface of the sealing seat 6. During this process, the cleaning plate 9 pushes the scraped impurities into the guide hole 14, and the impurities can fall into the storage hole 19 of the cleaning ball 18 through the guide hole 14. This process collects impurities. A proximity sensor, which can be inductive or capacitive, is pre-installed inside the guide hole 14. The proximity sensor detects the distance to the cleaning plate 9 in real time. When the distance between the lower end of the cleaning plate 9 and the proximity sensor reaches a preset distance (5-10mm), the cleaning plate 9 pushes the impurities remaining in the guide hole 14 further into the connecting hole 16, and then into the storage hole 19, reducing impurity residue and enhancing the cleaning effect. Simultaneously, the controller stops the first motor 10, allowing the cleaning process to continue. Plate 9 remains within the guide hole 14. Then, the controller starts the second motor 20, a servo motor. The rotation of the second motor 20 drives the cleaning ball 18 to rotate forward within the spherical rotating cavity 15 via the first rotating shaft 21, aligning the upper opening of the storage hole 19 with the discharge hole 17. Impurities in the storage hole 19 are then discharged through the discharge hole 17 to the outside of the sealing seat 6 under gravity. When the opening of the storage hole 19 connects with the discharge hole 17, the controller stops the second motor 20 and waits for a preset time to ensure sufficient impurity removal. After discharge and waiting for a preset time, the second motor 20 restarts and drives the cleaning ball 18 to rotate in the opposite direction until the upper opening of the storage hole 19 rotates back to connect with the connecting hole 16. At the same time, the controller controls the first motor 10 to rotate in the opposite direction, so that the cleaning plate 9 returns to its original position for the next cleaning. During use, the second motor 20 only needs to be started during cleaning, reducing the ineffective operation of the second motor 20 and greatly reducing energy consumption. The cleaning ball 18 also only needs to rotate during cleaning, reducing the number of times the cleaning ball 18 rubs against the inner wall of the rotating cavity 15 and extending the service life of the cleaning ball 18.

[0029] Example 4: Based on Example 3, such as Figures 1-6As shown, a mounting shell 24 is provided on the side of the sealing seat 6 away from the second motor 20. A through groove is provided at the bottom of the mounting shell 24. A second rotating hole is provided on the side of the rotating cavity 15 away from the first rotating hole. A second rotating shaft 25 is provided in the second rotating hole. One end of the second rotating shaft 25 is connected to the outer wall of the cleaning ball 18. The other end of the second rotating shaft 25 extends into the mounting shell 24 and is provided with a first bevel gear 26. A third rotating shaft 27 is provided in the mounting shell 24. The third rotating shaft 27 is perpendicular to the second rotating shaft 25. The front and rear ends of the third rotating shaft 27 are rotatably connected to the inner wall of the mounting shell 24, respectively. A second bevel gear 28 and a drive gear 29 are provided on the third rotating shaft 27. The second bevel gear 28 meshes with the first bevel gear 26. A sealing plate 30 is provided at the bottom of the sealing seat 6. The sealing plate 30 is used to seal the discharge hole 17. The upper surface of the sealing plate 30 is slidably connected to the bottom wall of the sealing seat 6. A rack 31 is provided at the end of the sealing plate 30 near the mounting shell 24. The upper surface of the rack 31 meshes with the lower side of the drive gear 29. A guide hole 32 is horizontally provided inside the sealing seat 6. A guide rod 33 is slidably provided inside the guide hole 32. The guide rod 33 is parallel to the rack 31. One end of the guide rod 33 extends to the outside of the guide hole 32 and is provided with a connecting block 34. The connecting block 34 is connected to the upper surface of the rack 31. The connecting block 34 and the drive gear 29 are not on the same vertical plane. A connecting spring 35 is provided inside the guide hole 32. One end of the connecting spring 35 is connected to the inner wall of the guide hole 32, and the other end of the connecting spring 35 is connected to the end of the guide rod 33 away from the connecting block 34.

[0030] The working principle and beneficial effects of the above technical solution are as follows: A sealing plate 30 is slidably installed at the bottom of the sealing seat 6. During the water injection operation, the sealing plate 30 can seal the discharge hole 17, improve the sealing effect of the discharge hole 17, and reduce the leakage rate of water injection. When cleaning is completed and impurities need to be discharged, the second motor 20 starts and drives the cleaning ball 18 to rotate in the forward direction, so that the upper opening of the storage hole 19 of the cleaning ball 18 is connected to the discharge hole 17. The forward rotation of the cleaning ball 18 can drive the second rotating shaft 25 to rotate synchronously in the forward direction. The rotation of the second rotating shaft 25 drives the first bevel gear 26 to rotate. The rotation of the first bevel gear 26 drives the second bevel gear 28 to rotate, thereby driving the third rotating shaft 27 and the drive gear 29 to rotate. The rotation of the drive gear 29 drives the rack 31 to slide away from the sealing seat 6. The rack 31 drives the sealing plate 30 along the bottom of the sealing seat 6. The wall slides, causing the discharge hole 17 to open automatically, allowing impurities in the storage hole 19 of the cleaning ball 18 to be discharged through the discharge hole 17. When the second motor 20 drives the cleaning ball 18 to rotate in the opposite direction via the first rotating shaft 21, the second rotating shaft 25 rotates in the opposite direction and drives the second bevel gear 28 to rotate in the opposite direction via the first bevel gear 26. The third rotating shaft 27 and the drive gear 29 rotate in the opposite direction. The drive gear 29 drives the rack 31 to slide towards the sealing seat 6. The rack 31 drives the sealing plate 30 to slide, thereby resealing the discharge hole 17, achieving automatic sealing of the discharge hole 17, improving the reliability of the seal, and preventing fluid leakage. During the movement of the rack 31, the rack 31 drives the guide rod 33 to slide in the guide hole 32 via the connecting block 34, which can provide precise guidance for the movement of the rack 31 and improve the stability of the sliding of the sealing plate 30.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. An automatic detection device for water injection oil wellheads, characterized in that, include: A wellhead pipe (1) is provided with a water injection pipe (2) on the side wall of the wellhead pipe (1). A water injection assembly is provided at the end of the water injection pipe (2) away from the wellhead pipe (1). The water injection assembly includes a filter pipe (3), an inlet pipe (4) and an outlet pipe (5). A sealing seat (6) is provided at the lower end of the filter pipe (3). One end of the inlet pipe (4) is connected to the upper part of the filter pipe (3). One end of the outlet pipe (5) is connected to the lower part of the filter pipe (3). A filter screen (7) is provided at the connection between the outlet pipe (5) and the filter pipe (3). The other end of the outlet pipe (5) is connected to the water injection pipe (2). A first pressure sensor is provided inside the inlet pipe (4). A second pressure sensor is provided inside the outlet pipe (5). An alarm and a controller are provided outside the outlet pipe (5). The controller is electrically connected to the first pressure sensor, the second pressure sensor and the alarm respectively.

2. The water injection wellhead device capable of automatic detection according to claim 1, characterized in that, A cleaning mechanism is installed inside the filter pipe (3). The cleaning mechanism includes a screw (8) and a cleaning plate (9). The upper end of the screw (8) is rotatably connected to the inner wall of the upper end of the filter pipe (3). A threaded hole is provided in the center of the cleaning plate (9). The cleaning plate (9) is threadedly connected to the outer wall of the screw (8) through the threaded hole. A slider is provided on the outer wall of the cleaning plate (9). A groove corresponding to the slider is provided on the inner wall of the filter pipe (3). The groove is vertically set. The slider is slidably connected to the inner wall of the groove. A first motor (10) is provided at the top of the filter pipe (3). The first motor (10) is electrically connected to the controller. The output end of the first motor (10) is connected to the upper end of the screw (8).

3. The water injection wellhead device capable of automatic detection according to claim 2, characterized in that, The cleaning plate (9) is truncated cone-shaped, and the diameter of the lower end of the cleaning plate (9) is smaller than the diameter of the upper end of the cleaning plate (9).

4. The water injection wellhead device capable of automatic detection according to claim 2, characterized in that, The cleaning plate (9) is provided with several vertically penetrating water outlets (11), which are set vertically.

5. The water injection wellhead device capable of automatic detection according to claim 4, characterized in that, A cleaning ring (12) is fixedly installed on the inner wall of the upper end of the filter pipe (3). The center of the cleaning ring (12) is rotatably connected to the outer wall of the screw (8). Several cleaning rods (13) are installed on the lower surface of the cleaning ring (12). The cleaning rods (13) correspond one-to-one with the water outlet (11). The diameter of the cleaning rods (13) is smaller than the diameter of the water outlet (11).

6. The water injection wellhead device capable of automatic detection according to claim 2, characterized in that, A guide hole (14) is provided on the upper surface of the sealing seat (6). The inner wall of the guide hole (14) is adapted to the outer wall of the cleaning plate (9). A proximity sensor is provided inside the guide hole (14) and is electrically connected to the controller. A rotating cavity (15) is provided inside the sealing seat (6). The rotating cavity (15) has a spherical structure. The rotating cavity (15) is connected to the lower end of the guide hole (14) through a connecting hole (16). The bottom of the rotating cavity (15) is connected to the lower part of the sealing seat (6) through a discharge hole (17). The rotating cavity (15) is provided with a guide hole (14) on the upper surface of the upper surface of the sealing seat (6). Place a cleaning ball (18), and a storage hole (19) is provided inside the cleaning ball (18). The upper end of the storage hole (19) is connected to the lower end of the connecting hole (16). A second motor (20) is provided on the outer wall of the sealing seat (6). The second motor (20) is electrically connected to the controller. A first rotating hole is provided inside the sealing seat (6). A first rotating shaft (21) is provided inside the first rotating hole. One end of the first rotating shaft (21) is connected to the output end of the second motor (20), and the other end of the first rotating shaft (21) is connected to the center position of the outer wall of the cleaning ball (18).

7. The water injection wellhead device capable of automatic detection according to claim 6, characterized in that, A support plate (22) is horizontally installed inside the connecting hole (16). The cross-sectional area of ​​the support plate (22) is smaller than that of the connecting hole (16). The front and rear ends of the support plate (22) are fixedly connected to the front and rear sides of the connecting hole (16) respectively. The lower end of the screw (8) is rotatably connected to the upper surface of the support plate (22).

8. The water injection wellhead device capable of automatic detection according to claim 7, characterized in that, The support plate (22) has guide plates (23) symmetrically arranged on the front and rear sides, and the longitudinal section of the guide plate (23) is triangular.

9. The water injection wellhead device capable of automatic detection according to claim 6, characterized in that, A mounting shell (24) is provided on the side of the sealing seat (6) away from the second motor (20). A through groove is provided at the bottom of the mounting shell (24). A second rotating hole is provided on the side of the rotating cavity (15) away from the first rotating hole. A second rotating shaft (25) is provided in the second rotating hole. One end of the second rotating shaft (25) is connected to the outer wall of the cleaning ball (18). The other end of the second rotating shaft (25) extends into the mounting shell (24) and is provided with a first bevel gear (26). A third rotating shaft (27) is provided in the mounting shell (24). The third rotating shaft (27) is perpendicular to the second rotating shaft (25). The front and rear ends are rotatably connected to the inner wall of the mounting shell (24) respectively. The second bevel gear (28) and the drive gear (29) are set on the third rotating shaft (27). The second bevel gear (28) meshes with the first bevel gear (26). The bottom of the sealing seat (6) is provided with a sealing plate (30). The sealing plate (30) is used to block the discharge hole (17). The upper surface of the sealing plate (30) is slidably connected to the bottom wall of the sealing seat (6) from left to right. A rack (31) is set at one end of the sealing plate (30) near the mounting shell (24). The upper surface of the rack (31) meshes with the lower side of the drive gear (29).

10. The water injection wellhead device capable of automatic detection according to claim 9, characterized in that, A guide hole (32) is horizontally provided inside the sealing seat (6). A guide rod (33) is slidably provided inside the guide hole (32). The guide rod (33) is parallel to the rack (31). One end of the guide rod (33) extends to the outside of the guide hole (32) and is provided with a connecting block (34). The connecting block (34) is connected to the upper surface of the rack (31). The connecting block (34) and the drive gear (29) are not on the same vertical plane. A connecting spring (35) is provided inside the guide hole (32). One end of the connecting spring (35) is connected to the inner wall of the guide hole (32), and the other end of the connecting spring (35) is connected to the end of the guide rod (33) away from the connecting block (34).

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