Wellhead water injection metering device for underground separated layer water injection

Abstract

The invention discloses a wellhead water injection metering device for underground separated layer water injection, and relates to the technical field of water injection metering devices. The device comprises a water injection device, a filtering assembly and a metering device. The water injection device forms a periodically changing pressurizing chamber in the water injection chamber through the pressurizing assembly, so that suction and pressurized discharge of a water source are realized. The filtering assembly comprises a conical filtering net and a follow-up cleaning mechanism driven by the pressurizing assembly, impurities can be effectively filtered, and self-cleaning can be achieved. The metering device comprises a winding mechanism and a pressure detection assembly. The rolling mechanism can lower the pressure detection assembly to different depths of the water injection pipe, the pressure detection assembly achieves flow calculation according to the Bernoulli equation by means of an annular space structure formed by a shell of the pressure detection assembly and the inner wall of the water injection pipe, the function of an intelligent sensor is achieved, and the technical problem that high-pressure layered water injection flow is accurately measured in a narrow pipeline space is solved. The device has the advantages of high automation degree, accurate measurement and simple and convenient maintenance.

Description

Technical Field

[0001] This invention relates to the field of water injection metering device technology, specifically a wellhead water injection metering device for downhole stratified water injection. Background Technology

[0002] In oilfield development, layered water injection is commonly used to maintain formation pressure and improve oil recovery. Wellhead equipment needs to inject high-pressure water into different oil layers downhole. During this process, the injected water usually needs to be filtered to prevent impurities from clogging the downhole water distributor. Existing water injection wellhead equipment often uses independently installed static filters. Under high-pressure, high-flow water injection operations, these filters are easily and quickly clogged by impurities, leading to decreased filtration efficiency and increased injection pressure.

[0003] Meanwhile, accurate flow measurement of water injection layers at different depths also presents challenges such as limited installation space and high pressure environment. Intelligent sensors are usually used to measure and detect water injection in the well, and the flow rate is accurately detected by the pressure difference between the front and rear parts. Summary of the Invention

[0004] The purpose of this invention is to provide a wellhead water injection metering device for downhole stratified water injection, so as to solve the problems mentioned in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: including a water injection device, a filter assembly, and a metering device; The water injection device includes a water injection chamber, a pressurizing component, and a water injection pipe. The pressurizing component is installed on the water injection chamber, and the water injection pipe is connected to the outlet of the water injection chamber. The filtration assembly includes a filter element, a follower element, and a cleaning element. The follower element is mounted on the pressurization assembly, the cleaning element is mounted on the follower element, and magnetic elements are mounted on both the follower element and the water injection chamber. The filter element includes a filter plate, a filter screen, and a collection box. The filter plate is installed on the water injection chamber and the pressurization assembly. The filter screen and the collection box are both installed on the filter plate. The outlet of the collection box passes through the water injection chamber and communicates with the outside. The metering device monitors the flow rate of the water injection pipe.

[0006] The pressurization assembly includes a pressurization box, a drive source, and a drive component. The inner wall of the pressurization box is provided with a protrusion. Both the pressurization box and the drive source are installed on the water injection chamber. The output end of the drive source is connected to the drive component. Multiple sets of rotating plates are installed on the drive component. The filter plate is installed on the water injection chamber and the pressurization box. The follower is installed on the output end of the drive source through a sliding member. The follower is located on the upper side of the filter plate.

[0007] The driving source is a drive motor.

[0008] The magnetic component on the follower is a magnet, and the magnetic component on the water injection chamber is an electromagnet, coil, etc. The follower and the magnetic component on the water injection chamber are arranged opposite to each other. The lower side of the follower is connected to the output end of the drive source through a reset spring.

[0009] A reset element is connected between each of the rotating plates and the driving component.

[0010] The sliding component consists of spline teeth and spline grooves. The spline teeth and spline grooves cooperate with each other to form a sliding connection. The spline teeth and spline grooves are respectively set on the output end of the drive source and the follower. The sliding component enables the follower to slide.

[0011] During water injection, the control system drives the drive component to rotate via the drive source. The drive component drives multiple sets of rotating plates to rotate as well, so that the multiple sets of rotating plates are on the inner wall of the water injection chamber. At this time, a pressurized chamber is formed between the two sets of rotating plates, the inner wall of the water injection chamber, and the drive component. When the two sets of rotating plates move away from the protrusion on the inner wall of the water injection chamber, the control system opens the solenoid valve in the inlet and closes the solenoid valve in the outlet. At this time, the reset component is released and pushes the two sets of rotating plates to move outward from the drive component. The volume of the pressurized chamber gradually increases and the external water source enters the pressurized chamber through the inlet. When the two sets of rotating plates come into contact with the protrusions on the inner wall of the pressurization chamber, the control system closes the solenoid valve in the inlet and opens the solenoid valve in the outlet. At this time, the two sets of rotating plates are forced to move into the drive unit at the same time, and the two sets of rotating plates compress the reset unit at the same time. The volume of the pressurization chamber gradually decreases, and the water in the pressurization chamber is discharged through the outlet.

[0012] After the water is discharged from the outlet, it passes through the filter screen and is discharged from the outlet of the water injection chamber. The water then enters the water injection pipe through the outlet of the water injection chamber and is discharged through the water injection pipe, thus realizing the water injection operation.

[0013] The filter plate includes a conical ring and two sets of fixing plates. The two sets of fixing plates are respectively disposed at both ends of the conical ring and are respectively installed on the water injection chamber and the pressurization box.

[0014] The conical ring has a conical cross-section, the filter screen is mounted on the conical ring, and the collection box is mounted on the fixed plate on the lower side.

[0015] After the water passes through the filter screen, the conical filter screen and conical ring guide the impurities downwards. The impurities move down the filter screen and fall onto the fixed plate on the lower side, so that they can be collected and processed.

[0016] The filter screen is elastic and has pleats.

[0017] The follower is connected to contact balls at both ends via telescopic components, and the cleaning component is located between two sets of contact balls. The telescopic component is a first spring, and the contact balls slide within the follower via the first spring. The contact balls are made of elastic material, such as rubber or silicone. The cleaning component is a brush.

[0018] The pressurization box is provided with an inlet and an outlet. The inlet is located on the side of the outlet and is connected to an external water source through the water injection chamber. The outlet is located on the protrusion and is directly opposite the filter element. Solenoid valves are installed in the inlet, outlet, and collection tank. Flow meters are also installed in the inlet and outlet.

[0019] The metering device includes a winding mechanism and a pressure detection component; The winding mechanism includes a power source, a winding roller, a winding rope, and a support. The power source is mounted on the support, and its output end is connected to the winding roller. The winding rope is wound around the winding roller, and one end of the winding rope is connected to a pressure detection component.

[0020] The power source drives the winding roller to rotate, and the winding roller releases or tightens the winding rope. By changing the length of the winding rope release, the position of the pressure detection component in the water injection pipe is changed, which can detect the water injection flow rate of different layers, meet the needs of multi-layer water injection flow rate measurement, solve the problem of high-pressure downhole water injection flow rate measurement, and has the functions of long service life, maintenance-free, reducing the labor intensity of on-site workers and improving the safety of production operations.

[0021] The pressure detection assembly includes a housing and a pressure core. The housing is connected to a winding rope, and the pressure core is mounted on the housing. The pressure core is electrically connected to a control system, and the housing and pressure core are located inside a water injection pipe.

[0022] The pressure core is a pressure sensor.

[0023] The outer shell and the interior of the water injection pipe form an annular structure. When water injection is carried out inside the water injection pipe, water passes through the annular structure, creating a pressure difference before and after the annular structure. The flow calculation method of the annular structure satisfies Bernoulli's fluid equation, enabling water flow detection. This measurement method cleverly installs a downhole micro high-pressure component in the narrow space of the water injection pipe and cleverly utilizes the structural flow channel to accurately measure the downhole water injection flow rate, which can meet the requirements of the micro-structure of water injection pipes with a diameter of 28mm-30mm.

[0024] Compared with the prior art, the beneficial effects of the present invention are: 1. Achieves self-cleaning and anti-clogging of the filter screen, ensuring continuous and efficient filtration. The pressure component's drive source rotates the follower, whose elastic contact balls at both ends alternately compress the pleated elastic filter screen and the fixed conical ring, causing the filter screen to undergo continuous up-and-down deformation. This deformation shakes off attached impurities and alters the water flow path, agitating the filter cake. During cleaning, the follower is moved downwards by the repulsive force of an electromagnet, causing the brush on it to scrape the filter screen surface and push impurities into the collection box; this achieves dynamic self-cleaning during the filtration process. The periodic deformation of the filter screen during water injection effectively prevents impurities from becoming embedded and compacted in the mesh, significantly improving filtration efficiency and service life. When deep cleaning is required, there is no need to stop the machine for disassembly; cleaning is completed by magnetically controlling the brush to contact the filter screen, and impurities are collected and discharged. This completely changes the situation of traditional static filters being prone to clogging and difficult to clean, greatly reducing maintenance frequency and downtime, ensuring continuous and stable operation of water injection, and reducing the risks and costs of manual operation.

[0025] 2. Achieving precise measurement of stratified water injection flow rate in confined spaces within high-pressure wells. The depth of the pressure detection component within the injection pipe is adjusted by releasing or retracting the winding rope via a winding mechanism at the wellhead. This pressure adjustment component functions as an intelligent sensor. The outer shell of the pressure detection component forms an annular flow channel with the inner wall of the injection pipe, generating a pressure difference as the injected water flows through this annular gap. The pressure core mounted on the component detects this pressure difference signal and transmits it to the control system, which calculates the real-time flow rate based on Bernoulli's equation. By combining a miniature high-pressure sensor with a movable retraction structure, the system cleverly utilizes the annular flow channel within the injection pipe to generate the required pressure difference for measurement. By changing the sensor's position, flow rate measurement can be easily performed on different injection layers. This structure is particularly suitable for small-diameter high-pressure injection pipes of 28mm-30mm, solving the problem of installing reliable metering instruments in such confined spaces. It offers high measurement accuracy, eliminates the need for complex mechanical moving parts installed downhole, and significantly improves the control precision and management level of the stratified water injection process.

[0026] 3. High degree of integration and automation, enhancing system reliability and operational safety. The system highly integrates pressurized water injection, dynamic filtration, magnetically controlled cleaning, and stratified metering functions into a single wellhead unit. The filtration and cleaning actions are directly powered by the water injection pressurization drive source, with the cleaning mode switching controlled by the on / off switching of an electromagnet. Each inlet, outlet, and collection tank is equipped with a solenoid valve and flow meter, all centrally coordinated and controlled. This highly integrated design simplifies wellhead pipeline and equipment layout, reduces connection points and potential leakage risks, and improves overall system reliability. The linked design of pressurization and filtration cleaning requires no additional power source, resulting in energy savings and a compact structure. The entire unit's operation, from pressurized water injection and self-cleaning filtration to stratified metering, can be automatically monitored and operated through the control system, significantly reducing the need for manual intervention. This not only reduces the labor intensity of workers but also avoids the safety risks associated with frequent personnel access to high-pressure water injection areas for maintenance operations, achieving safer and more intelligent oilfield water injection operations. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the take-up roller in this invention; Figure 3 This is a schematic diagram of the water injection chamber in this invention; Figure 4 This is a schematic diagram of the driving source structure in this invention; Figure 5 yes Figure 4 A magnified view of a portion of region A in the middle; Figure 6 This is a schematic diagram of the filter screen in this invention; Figure 7 This is a schematic diagram of the rotating plate in this invention.

[0028] In the diagram: 1. Water injection device; 11. Water injection chamber; 12. Pressure tank; 121. Liquid inlet; 122. Liquid outlet; 13. Drive source; 14. Drive component; 141. Rotating plate; 15. Filter component; 151. Filter plate; 1511. Conical ring; 152. Filter screen; 153. Collection box; 16. Follower component; 17. Cleaning component; 18. Magnetic component; 2. Metering device; 21. Winding mechanism; 211. Power source; 212. Winding roller; 213. Winding rope; 22. Pressure detection component; 221. Outer shell; 222. Pressure core. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example: Figures 1-7 As shown, the present invention provides a technical solution for a wellhead water injection metering device for downhole stratified water injection, including a water injection device 1, a filter assembly, and a metering device 2; the water injection device 1 includes a water injection chamber 11, a pressurizing assembly, and a water injection pipe, the pressurizing assembly is installed on the water injection chamber 11, and the water injection pipe is connected to the outlet of the water injection chamber 11; the filter assembly includes a filter element 15, a follower element 16, and a cleaning element 17, the follower element 16 is installed on the pressurizing assembly, the cleaning element 17 is installed on the follower element 16, and magnetic elements 18 are installed on both the follower element 16 and the water injection chamber 11; the filter element 15 includes a filter plate 151, a filter screen 152, and a collection box 153, the filter plate 151 is installed on the water injection chamber 11 and the pressurizing assembly, the filter screen 152 and the collection box 153 are both installed on the filter plate 151, and the outlet of the collection box 153 passes through the water injection chamber 11 and communicates with the outside; the metering device 2 monitors the flow rate of the water injection pipe.

[0031] The pressurization assembly includes a pressurization box 12, a drive source 13, and a drive component 14. The inner wall of the pressurization box 12 is provided with a protrusion. The pressurization box 12 and the drive source 13 are both installed on the water injection chamber 11. The output end of the drive source 13 is connected to the drive component 14. Multiple sets of rotating plates 141 are installed on the drive component 14. The filter plate 151 is installed on the water injection chamber 11 and the pressurization box 12. The follower 16 is installed on the output end of the drive source 13 through a sliding member. The follower 16 is located on the upper side of the filter plate 15.

[0032] The drive source 13 is a drive motor. The magnetic component 18 on the follower 16 is a magnet, and the magnetic component 18 on the water injection chamber 11 is an electromagnet, coil, etc. The follower 16 and the magnetic component 18 on the water injection chamber 11 are arranged opposite to each other. The lower side of the follower 16 is connected to the output end of the drive source 13 through a return spring. A reset component is connected between each rotating plate 141 and the drive component 14. The sliding component is a spline tooth and a spline groove. The spline tooth and spline groove cooperate with each other to form a sliding connection. The spline tooth and spline groove are respectively set on the output end of the drive source 13 and the follower 16. The sliding component realizes the sliding of the follower 16.

[0033] During water injection, the control system drives the drive component 14 to rotate via the drive source 13. The drive component 14 drives multiple sets of rotating plates 141 to rotate as well, so that the multiple sets of rotating plates 141 are on the inner wall of the water injection chamber 11. At this time, a pressurized chamber is formed between the two sets of rotating plates 141, the inner wall of the water injection chamber 11, and the drive component 14. When the two sets of rotating plates 141 move away from the protrusion on the inner wall of the water injection chamber 11, the control system opens the solenoid valve in the inlet 121 and closes the solenoid valve in the outlet 122. At this time, the reset member is released and pushes the two sets of rotating plates 141 to move outward from the drive member 14. The volume of the pressurized chamber gradually increases and the external water source enters the pressurized chamber through the inlet 121. When the two sets of rotating plates 141 come into contact with the protrusions on the inner wall of the pressurization chamber 12, the control system closes the solenoid valve in the inlet 121 and opens the solenoid valve in the outlet 122. At this time, the two sets of rotating plates 141 are forced to move into the drive member 14 at the same time, and the two sets of rotating plates 141 simultaneously compress the reset member. The volume of the pressurization chamber gradually decreases, and the water in the pressurization chamber is discharged through the outlet 122.

[0034] The filter plate 151 includes a conical ring 1511 and two sets of fixing plates. The two sets of fixing plates are respectively disposed at both ends of the conical ring 1511 and are respectively installed on the water injection chamber 11 and the pressurization box 12. The longitudinal section of the conical ring 1511 is conical. The filter screen 152 is installed on the conical ring 1511 and the collection box 153 is installed on the lower fixing plate.

[0035] After water is discharged from the outlet 122, it passes through the filter screen 152 and is discharged from the outlet of the water injection chamber 11. The water enters the water injection pipe through the outlet of the water injection chamber 11 and is discharged through the water injection pipe, thus realizing the water injection operation.

[0036] After the water is filtered through the filter screen 152, the conical filter screen 152 and the conical ring 1511 will guide the impurities to move downwards. The impurities move downwards along the filter screen 152 and fall onto the fixed plate on the lower side, so that the impurities can be collected and processed.

[0037] The filter 152 is elastic and has pleats.

[0038] The follower 16 has contact balls connected to both ends via telescopic components, and the cleaning component 17 is located between the two sets of contact balls. The telescopic component is a first spring (not shown in the figure), and the contact balls slide within the follower 16 via the first spring. The contact balls are made of elastic material, such as rubber or silicone. The cleaning component 17 is a brush.

[0039] During water injection, the contact ball on the follower 16 alternately contacts the filter screen 152 and the conical ring 1511; When the contact ball comes into contact with the filter screen 152, the telescopic component pushes the contact ball downward to squeeze the filter screen 152, causing the filter screen 152 to protrude downward. When the contact ball contacts the conical ring 1511, the contact ball is forced to retract into the follower 16, and the contact member simultaneously compresses the telescopic member. At this time, the filter screen 152 recovers upward through its own elasticity. As the follower 16 continues to rotate, the contact ball continuously squeezes the filter screen 152 and moves away, causing the filter screen 152 to move up and down, improving the filtration effect of the filter screen 152, and also facilitating the removal of impurities from the filter screen 152 and moving them to the fixed plate on the lower side, thus achieving the cleaning of the filter screen 152.

[0040] When the filter screen 152 needs to be cleaned, the operator opens the solenoid valve in the collection box 153 through the control system and connects the magnetic component 18 on the water injection chamber 11 to the circuit, so that the water injection chamber 11 and the magnetic component 18 on the follower 16 generate a repulsive magnetic field. Under the action of the magnetic repulsive force, the follower 16 moves downward through the sliding component, and the cleaning component 17 on the follower 16 can contact the filter screen 152. At this time, the cleaning component 17 will push the impurities on the lower fixed plate into the collection box 153 during the rotation process. The impurities are discharged to the outside through the outlet of the collection box 153, thereby realizing the discharge of impurities.

[0041] The pressurization tank 12 is equipped with an inlet 121 and an outlet 122. The inlet 121 is located to the side of the outlet 122 and passes through the water injection chamber 11 to connect to an external water source. The outlet 122 is located on a protrusion and faces the filter element 15. Solenoid valves are installed in the inlet 121, the outlet 122, and the collection tank 153. Flow meters are also installed in the inlet 121 and the outlet 122.

[0042] The metering device 2 includes a winding mechanism 21 and a pressure detection component 22. The winding mechanism 21 includes a power source 211, a winding roller 212, a winding rope 213, and a bracket. The power source 211 is mounted on the bracket, and the output end of the power source 211 is connected to the winding roller 212. The winding rope 213 is wound around the winding roller 212, and one end of the winding rope 213 is connected to the pressure detection component 22. The pressure detection component 22 includes a housing 221 and a pressure core 222. The housing 221 is connected to the winding rope 213, and the pressure core 222 is mounted on the housing 221. The pressure core 222 is electrically connected to the control system. The housing 221 and the pressure core 222 are located inside the water injection pipe.

[0043] The power source 211 drives the winding roller 212 to rotate, and the winding roller 212 releases or tightens the winding rope 213. By changing the release length of the winding rope 213, the position of the pressure detection component 22 in the water injection pipe is changed, which can detect the water injection flow rate of different layers, meet the multi-layer water injection flow rate measurement needs, solve the problem of high-pressure well water injection flow rate measurement, and has the functions of long service life, maintenance-free, reducing the labor intensity of on-site workers and improving the safety of production operations.

[0044] Pressure core 222 is a pressure sensor.

[0045] The outer shell 221 and the inside of the water injection pipe form an annular structure. When water injection is carried out inside the water injection pipe, water passes through the annular structure, creating a pressure difference before and after the annular structure. The flow calculation method of the annular structure satisfies Bernoulli's fluid equation to realize the flow detection of water. This measurement method cleverly installs a downhole micro high-pressure component in the narrow space of the water injection pipe and cleverly uses the structural flow channel to accurately measure the downhole water injection flow. It can meet the requirements of the micro-structure of water injection pipes of 28mm-30mm.

[0046] Working principle: During water injection, the control system starts the drive source 13 to drive the drive component 14 to rotate. Multiple sets of rotating plates 141 on the drive component 14 follow the rotation and slide on the inner wall and protrusion of the pressurization box 12 to form a pressurization chamber composed of two sets of rotating plates 141, the inner wall of the water injection chamber 11 and the drive component 14. When the rotating plate 141 moves away from the protrusion, the control system opens the solenoid valve of the inlet 121 and closes the solenoid valve of the outlet 122. The reset component is released and pushes the rotating plate 141 to move outward, the volume of the pressurized chamber increases, and the external water source enters through the inlet 121. When the rotating plate 141 contacts the protrusion, the control system closes the solenoid valve of the inlet 121 and opens the solenoid valve of the outlet 122. The rotating plate 141 moves inward to compress the reset component, the volume of the pressurized chamber decreases, and water is discharged from the outlet 122 to the filter element 15.

[0047] Water is filtered through the filter screen 152 of the filter element 15, and impurities are guided to the collection box 153 along the conical ring 1511. Simultaneously, the follower element 16 rotates with the output end of the drive source 13 via a sliding member, and its contact balls alternately squeeze the filter screen 152 and the conical ring 1511, causing the filter screen 152 to move up and down to enhance filtration and cleaning effects. When deep cleaning is required, the control system energizes the magnetic component 18 on the water injection chamber 11, generating a repulsive magnetic field with the magnetic component 18 on the follower element 16, pushing the follower element 16 downwards so that the cleaning component 17 contacts it. The filter screen 152 pushes impurities into the collection box 153, and the impurities are discharged through the solenoid valve of the collection box 153. The filtered water enters the water injection pipe from the outlet of the water injection chamber 11. The metering device 2 is activated, and the power source 211 drives the winding roller 212 to rotate to release or tighten the winding rope 213. The position of the pressure detection component 22 in the water injection pipe is adjusted. The outer shell 221 and the pressure core 222 of the pressure detection component 22 use the pressure difference generated by the annular gap structure to calculate the water flow rate through Bernoulli's fluid equation, thereby realizing the monitoring of the downhole stratified water injection flow rate.

[0048] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A wellhead water injection metering device for downhole stratified water injection, characterized in that: It includes a water injection device (1), a filter assembly, and a metering device (2). The water injection device (1) includes a water injection chamber (11), a pressurizing component and a water injection pipe. The pressurizing component is installed on the water injection chamber (11) and the water injection pipe is connected to the outlet of the water injection chamber (11). The filter assembly includes a filter element (15), a follower element (16) and a cleaning element (17). The follower element (16) is mounted on the pressurization assembly, and the cleaning element (17) is mounted on the follower element (16). Magnetic elements (18) are mounted on both the follower element (16) and the water injection chamber (11). The filter element (15) includes a filter plate (151), a filter screen (152), and a collection box (153). The filter plate (151) is installed on the water injection chamber (11) and the pressurization assembly. The filter screen (152) and the collection box (153) are both installed on the filter plate (151). The outlet of the collection box (153) passes through the water injection chamber (11) and communicates with the outside. The metering device (2) monitors the flow rate of the water injection pipe.

2. The wellhead water injection metering device for downhole stratified water injection according to claim 1, characterized in that: The pressurization assembly includes a pressurization box (12), a drive source (13), and a drive component (14). The inner wall of the pressurization box (12) is provided with protrusions. The pressurization box (12) and the drive source (13) are both installed on the water injection chamber (11). The output end of the drive source (13) is connected to the drive component (14). Multiple sets of rotating plates (141) are installed on the drive component (14). The filter plate (151) is installed on the water injection chamber (11) and the pressurization box (12), and the follower (16) is installed on the output end of the drive source (13) through the sliding member.

3. A wellhead water injection metering device for downhole stratified water injection according to claim 2, characterized in that: The filter plate (151) includes a conical ring (1511) and two sets of fixing plates. The two sets of fixing plates are respectively disposed at both ends of the conical ring (1511) and are respectively installed on the water injection chamber (11) and the pressurization box (12).

4. A wellhead water injection metering device for downhole stratified water injection according to claim 3, characterized in that: The longitudinal section of the conical ring (1511) is conical, the filter screen (152) is installed on the conical ring (1511), and the collection box (153) is installed on the fixing plate on the lower side.

5. A wellhead water injection metering device for downhole stratified water injection according to claim 4, characterized in that: The filter screen (152) is elastic and has pleats.

6. A wellhead water injection metering device for downhole stratified water injection according to claim 5, characterized in that: The two ends of the follower (16) are connected to contact balls via telescopic components, and the cleaning component (17) is located between the two sets of contact balls.

7. A wellhead water injection metering device for downhole stratified water injection according to claim 6, characterized in that: The pressurizing box (12) is provided with an inlet (121) and an outlet (122). The inlet (121) is located on one side of the outlet (122). The inlet (121) passes through the water injection chamber (11) and is connected to an external water source. The outlet (122) is located on the protrusion and faces the filter element (15). Solenoid valves are installed in the inlet (121), outlet (122), and collection tank (153).

8. A wellhead water injection metering device for downhole stratified water injection according to claim 1, characterized in that: The metering device (2) includes a winding mechanism (21) and a pressure detection component (22). The winding mechanism (21) includes a power source (211), a winding roller (212), a winding rope (213), and a bracket. The power source (211) is mounted on the bracket, and the output end of the power source (211) is connected to the winding roller (212). The winding rope (213) is wound around the winding roller (212), and one end of the winding rope (213) is connected to the pressure detection component (22).

9. A wellhead water injection metering device for downhole stratified water injection according to claim 8, characterized in that: The pressure detection component (22) includes a housing (221) and a pressure core (222). The housing (221) is connected to a winding rope (213). The pressure core (222) is mounted on the housing (221) and is electrically connected to the control system. The housing (221) and the pressure core (222) are located inside the water injection pipe.

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