Self-adjusting reset type water distributor

Abstract

The present application relates to the technical field of water distributor of oil field, especially to an automatic adjusting reset type water distributor, which comprises a lower joint, an outer sleeve and an upper joint, the outer wall of the outer sleeve is connected with the lower joint and the upper joint through O-shaped sealing rings on both sides, and the inner wall of the upper joint is provided with an adjusting assembly. Through the cooperation between the piston column, the reset spring, the flange sleeve, the short rod, the middle rod, the long rod and the stop block, if the water inlet pressure is still rising, it indicates that the water flow cannot be completely entered from the inner hole of the flange sleeve, and after the water injection is completed, the reset spring can drive the circular plate and the piston column to move right to reset, and then the circular plate can be driven to be inserted back into the inside of the flange sleeve through the stop block on the outer wall of the long rod, the middle rod and the short rod, so that the problem that the prior art cannot automatically adjust the flow area according to the actual injection pressure and flow rate of the downhole, and the water distribution device has self-recovery ability after abnormal working condition can be effectively solved.

Description

Technical Field

[0001] This invention relates to the field of oilfield water distributor technology, specifically an automatic adjustment and reset type water distributor. Background Technology

[0002] Currently, the water distributors commonly used in oilfield water injection development rely on manual retrieval and fixed nozzle adjustment. In actual complex downhole conditions, problems such as decreased water distribution accuracy, frequent testing and adjustment, high labor intensity, and long operation cycles often occur due to scaling, corrosion, pressure fluctuations, or blockage by impurities. Especially in high-salinity and scale-prone formations, the adjustment mechanism of conventional water distributors is prone to jamming and loss of adjustment function, which seriously affects the effect of stratified water injection and the needs of stable oilfield production development. Furthermore, there is still a problem that the flow area can only be adjusted under a fixed pressure value, which cannot meet the needs of use. Summary of the Invention

[0003] The purpose of this invention is to solve the problem that in high-mineralization, easily scaling formations, the adjustment mechanism of conventional water distributors is prone to jamming and losing its adjustment function, which seriously affects the effect of stratified water injection and the needs of stable oilfield production development. Furthermore, the device still has the problem that it can only adjust the flow area under a fixed pressure value, which cannot meet the needs of use. Therefore, an automatic adjustment and reset type water distributor is proposed.

[0004] To achieve the above objectives, the present invention provides the following technical solution: Design an automatic adjusting and resetting water distributor, including a lower connector, an outer sleeve and an upper connector. The two ends of the outer sleeve are connected to the lower connector and the upper connector respectively by threads. The outer walls of the outer sleeve are sealed to the lower connector and the upper connector by O-rings. The inner wall of the upper connector is provided with an adjusting component. The adjusting assembly includes a flange and a return spring. The flange can be connected to the upper connector by bolts. A piston rod is fitted to the inner wall of the flange. A circular plate is fixed to the end of the piston rod. Multiple long rods, middle rods and short rods are slidably connected to the outer, middle and inner sides of the circular plate, respectively. Stops are fixed to the outer walls and ends of the long rods, middle rods and short rods. The two sides of the return spring are fixedly connected to the circular plate and the flange, respectively.

[0005] This setup: Through the design of the circular plate, short rod, middle rod, and long rod, the piston rod can drive the circular plate to move. After moving for a period of time, the circular plate first contacts the stop at the end of the short rod, which then drives the short rod to move to the left and pull it out from inside the flange sleeve. If the inlet water pressure is rising, the continuous movement will cause the circular plate to pull the middle rod out from inside the flange sleeve, allowing water to flow through the middle ring hole. If the inlet water pressure is still rising, it will eventually automatically drive the long rod to pull it out from the flange sleeve, allowing water to flow through the outer ring hole.

[0006] Preferably, the right ends of the long rod, middle rod, and short rod form a complete arc surface with the inner wall of the flange sleeve.

[0007] Preferably, one side of the inner wall of the outer sleeve is connected to the sealing element fixing device by a hexagonal set screw, and the center of the inner wall of the outer sleeve is fixedly connected to the valve seat of the main valve component.

[0008] Preferably, the valve disc and central shaft of the main valve component are connected to an external motor via a rotating component, and a turbine flow meter is installed on the outer wall of the central shaft of the main valve component.

[0009] This setting: Through the design of the turbine flow meter and main valve, the turbine flow meter can measure the injection water flow in real time and convert the fluid velocity into an electrical signal (pulse or frequency signal) to provide core data for flow control. The main valve, as the core flow regulation unit of the water distributor, changes the flow area by the displacement of the valve disc to achieve precise control of the stratified flow. In conjunction with the upper and lower limits, the valve disc stroke is limited.

[0010] Preferably, a control component is provided at the left end of the flange sleeve. The control component includes an arc-shaped connecting plate, a first vertical plate, and a second vertical plate. Each layer of the arc-shaped connecting plate can connect the end blocks of the long rod, the middle rod, and the short rod together. The first vertical plate is fixed to the end block face of the long rod on the upper and lower sides, and the second vertical plate is fixed to the end block face of the middle rod on the upper and lower sides.

[0011] Preferably, the upper interior of the first vertical plate is threaded with an adjusting bolt, and the lower inner wall of the first vertical plate is machined with a hole. The lower interior of the second vertical plate is also threaded with an adjusting bolt, and the upper inner wall of the second vertical plate is also machined with a hole. The end of the adjusting bolt is fixed with a pressure plate.

[0012] This setup, through the design of adjusting bolts, pressure plates, long rods, middle rods, and circular plates, allows rotating the upper adjusting bolt to move the end pressure plate to the right, closer to the circular plate. When the circular plate then moves to the left, it, through the pressure plate, and consequently through the vertical plate and the arc-shaped connecting plate, moves all the long rods synchronously. The lower adjusting bolt operates on the same principle. This allows the circular plate to push the pressure plate at different positions, thereby pulling out the long rods and middle rod. This enables the control and adjustment of different flow area trigger values ​​according to specific pressure changes.

[0013] Preferably, the inner wall of the upper connector is threaded with an intermediate sleeve, and the inner wall of the intermediate sleeve is threaded with a circuit board bracket.

[0014] Preferably, the inner wall step of the intermediate sleeve is machined with an upper limit and a lower limit on both sides.

[0015] The automatic adjustment and reset type water distributor proposed in this invention has the following advantages: Through the cooperation of the piston rod, return spring, flange sleeve, short rod, middle rod, long rod, and stop block, as water is continuously injected, the pressure increases. This water pressure then pushes the piston rod to the left, overcoming the spring force of the return spring. The piston rod drives the circular plate to move. After moving for a period of time, the circular plate first contacts the stop block at the end of the short rod, which then drives the short rod to move to the left, pulling it out of the flange sleeve and allowing water to flow into the outer sleeve. If the inlet pressure continues to rise, it indicates that water cannot fully enter through the inner ring hole of the flange sleeve alone. In this case, the water pressure will further push the piston rod and the circular plate, causing the circular plate to pull the middle rod out of the flange sleeve. The internal part is pulled out to allow water flow through the middle ring hole. If the water pressure is still rising, the long rod will eventually be automatically pulled out from the flange sleeve to allow water flow through the outer ring hole. This allows for automatic adjustment of the flow area according to different injection pressures. After the water injection ends, the return spring can move the circular plate and piston column to the right to reset. Then, the circular plate can be pushed back into the flange sleeve by the blocks on the outer walls of the long rod, middle rod, and short rod. This effectively solves the problem that existing water distribution devices cannot automatically adjust the flow area according to changes in actual downhole water injection pressure and flow rate, and have self-recovery capabilities after abnormal operating conditions. By adjusting the bolts, circular plate, pressure plate, long rod, return spring, and pressure plate, the user can control different positions by rotating two adjusting bolts. For example, rotating the upper adjusting bolt moves the pressure plate at the end to the right, closer to the circular plate. When the circular plate moves to the left, it will move the long rod synchronously through the pressure plate, the vertical plate, and the arc-shaped connecting plate. The lower adjusting bolt works in the same way. In this way, the circular plate can push the pressure plate at different positions (different movement distances correspond to different compression states of the return spring, which in turn correspond to different water injection pressures), thereby pulling out the long rod and the middle rod. This effectively avoids the problem that the flow area can only be adjusted at a fixed pressure value, which cannot meet the needs of use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the external structure of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of a partial cross-sectional structure in the diagram; Figure 3 For the present invention Figure 1 A schematic diagram of the cross-sectional structure at one end of the middle section; Figure 4 This is a partial cross-sectional view of the upper connector in this invention; Figure 5 For the present invention Figure 4Schematic diagram of the flange sleeve structure; Figure 6 For the present invention Figure 5 A schematic diagram of the rear view structure in the diagram; Figure 7 For the present invention Figure 5 Schematic diagram of the cross-sectional structure in the middle; Figure 8 This is a cross-sectional front view schematic diagram of the outer sleeve, lower connector, and upper connector in this invention.

[0017] In the diagram: 1. Lower connector, 2. Sealing element fixing device, 3. Outer sleeve, 4. Adjusting assembly, 401. Flange sleeve, 402. Piston column, 403. Circular plate, 404. Long rod, 405. Middle rod, 406. Short rod, 407. Return spring, 408. Stop block, 5. Control assembly, 501. Adjusting bolt, 502. Arc-shaped connecting plate, 503. Vertical plate one, 504. Pressure plate, 505. Vertical plate two, 6. Rotating component, 7. Intermediate sleeve, 8. Circuit board bracket, 9. O-ring seal, 10. Upper connector, 11. Hexagonal set screw, 12. Upper limit, 13. Lower limit, 14. Main valve, 15. Turbine flow meter. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings: See attached document Figure 1-8 In this embodiment, an automatic adjustment and reset type water distributor includes a lower connector 1, an outer sleeve 3 and an upper connector 10. The two ends of the outer sleeve 3 are connected to the lower connector 1 and the upper connector 10 respectively by threads. The outer walls of the outer sleeve 3 are sealed to the lower connector 1 and the upper connector 10 by O-rings 9. An adjustment component 4 is provided on the inner wall of the upper connector 10. Adjustment assembly 4 includes a flange sleeve 401 and a return spring 407. The flange sleeve 401 can be connected to the upper connector 10 by bolts. A piston rod 402 is fitted against the inner wall of the flange sleeve 401. The piston rod 402 can move inside the flange sleeve 401 while ensuring relative sealing during movement. A circular plate 403 is fixed to the end of the piston rod 402. Multiple long rods 404, middle rods 405, and short rods 406 are slidably connected to the outer, middle, and inner sides of the circular plate 403, respectively. 04. The outer walls and ends of the middle rod 405 and the short rod 406 are fixedly connected to the stop blocks 408. The circular plate 403 can drive the long rod 404, the middle rod 405 and the short rod 406 to move through the stop blocks 408. The elastic coefficient of the return spring 407 can be determined according to the specific application. The two sides of the return spring 407 are fixedly connected to the circular plate 403 and the flange sleeve 401 respectively. The right ends of the long rod 404, the middle rod 405 and the short rod 406 form a complete arc surface with the inner wall of the flange sleeve 401.

[0019] See attached document Figure 1-8In this embodiment, one side of the inner wall of the outer sleeve 3 is connected to the sealing element fixing device 2 by a hexagonal set screw 11. The center of the inner wall of the outer sleeve 3 is fixedly connected to the valve seat of the main valve 14. The valve disc and the central shaft of the main valve 14 are connected to an external motor through a rotating component 6. A turbine flow meter 15 is installed on the outer wall of the central shaft of the main valve 14. The model of the turbine flow meter 15 can be determined according to the specific application. The inner wall of the upper connector 10 is threaded with an intermediate sleeve 7. The inner wall of the intermediate sleeve 7 is threaded with a circuit board bracket 8. The upper limit position 12 and the lower limit position 13 are respectively machined on both sides of the inner wall step of the intermediate sleeve 7.

[0020] The lower connector 1 serves as the fluid outlet end of the water distributor, connecting to the lower tubing or the injection layer tubing to deliver the regulated injection water to the target formation. The sealing element fixing device 2 provides a supporting reference surface for the internal rotating parts 6 and the main valve 5, preventing fluid leakage along the gaps between the parts and ensuring pressure isolation between the inner flow channel and the external annulus. The outer casing 3 serves as the external pressure-bearing shell of the water distributor, withstanding downhole pressure of 0~60MPa and high temperature of 0~150℃, protecting the internal precision components. The turbine flow meter 15 can measure the injection water flow rate in real time, converting the fluid velocity into an electrical signal (pulse or frequency signal) to provide core data for flow control. The main valve 14 serves as the core flow regulation unit of the water distributor, changing the flow area through valve disc displacement to achieve precise control of stratified flow. In conjunction with the upper limit 12 and lower limit 13, it limits the valve disc stroke.

[0021] The rotating component 6 can transmit the output torque (12 N·m) of the external motor, converting the rotational motion of the motor into the linear or rotational motion of the main valve 5 to achieve opening adjustment. The intermediate sleeve 7 can separate the internal flow channel from the electrical control chamber, preventing well fluid from entering the circuit board and sensors, protecting the electrical components, and providing guidance and support for the rotating component 6 and the main valve 5. The circuit board bracket 8 can be used to fix the control circuit board, pressure sensors (P1 / P2), and flow signal processing module, realizing the integrated installation of electrical components. The O-ring seal 9 realizes static and dynamic sealing between various components, preventing high-pressure injected water leakage or well fluid from entering the internal components. The upper connector 10 serves as the fluid inlet end of the water distributor, connecting to the upper tubing string to receive injected water from the surface. The hexagonal set screw 11 can be used to circumferentially fasten the sealing element fixing device 2 and the circuit board bracket 8. The components are designed to prevent loosening or rotation caused by downhole vibration. The upper limit 12 restricts the maximum opening of the main valve 5 to prevent structural damage or flow loss caused by valve disc overshoot. The lower limit 13 restricts the minimum opening of the main valve 5 to prevent the valve disc from completely closing and causing flow channel blockage, thus ensuring the minimum injection flow rate.

[0022] See attached document Figure 1-8In this embodiment, a control component 5 is provided at the left end of the flange sleeve 401. The control component 5 includes an arc-shaped connecting plate 502, a first vertical plate 503, and a second vertical plate 505. Each arc-shaped connecting plate 502 can connect the end blocks 408 of the long rod 404, the middle rod 405, and the short rod 406 together. The first vertical plate 503 is fixed to the end face of the end block 408 of the long rod 404 on both the upper and lower sides. The second vertical plate 505 is fixed to the end face of the end block 408 of the middle rod 405 on both the upper and lower sides. The position of the pressure plate 504 is... When the circular plate 403 moves, it can move the long rod 404 or the middle rod 405 through the vertical plate. The upper part of the vertical plate 1 503 is threaded with an adjusting bolt 501, and the lower inner wall of the vertical plate 1 503 is machined with a hole. The lower part of the vertical plate 2 505 is also threaded with an adjusting bolt 501. When the adjusting bolt 501 rotates, it can drive the pressure plate 504 to move and adjust its position. The upper inner wall of the vertical plate 2 503 is also machined with a hole, and the end of the adjusting bolt 501 is fixed to the pressure plate 504.

[0023] Working principle: When this automatic adjusting and resetting water distributor is needed, the user first assembles and connects the overall structure, and connects the rotating part 6 to the output shaft of an external motor via a spline. In use, the entire water distributor is installed in the corresponding oil well, and then water is injected from the surface pump set through the oil pipe to the upper connector 10, entering the inner cavity of the water distributor's outer sleeve 3. The water flow first passes through the sealing element fixing device 2, where the O-ring seal 9 provides initial sealing to prevent fluid leakage along the gaps between components. Subsequently, the water flow enters the turbine flow meter 15 area, where the water impacts the turbine's rotation. The turbine speed is proportional to the flow rate. The turbine flow meter 15 converts the flow signal into an electrical signal, which is transmitted to the control circuit in real time, providing data support for subsequent adjustments.

[0024] The control circuit drives the motor (technical requirements: 48V, torque 12N·m) inside the water distributor to output torque based on the difference between the set flow rate and the actual flow rate. The torque is transmitted to the main valve 5 through the rotating component 6, driving the valve to rotate / move axially, changing the gap between the valve disc and the valve seat, thereby adjusting the flow area. If the measured flow rate is less than the set flow rate: the motor rotates forward, the rotating part 6 drives the main valve 14 to open wider, the flow area increases, and the flow rate increases; If the measured flow rate is greater than the set flow rate: the motor reverses, and the rotating part 6 drives the main valve 14 to close less, reducing the flow area and decreasing the flow rate. During the adjustment process, the upper limit 12 and the lower limit 13 play a mechanical protection role: when the main valve 14 is opened to the maximum, it touches the upper limit 12 to prevent overrush damage; when it is closed to the minimum, it touches the lower limit 13 to avoid completely blocking the flow channel and causing water injection interruption.

[0025] After being regulated by the main valve 14, the water flow is divided according to the target layer through the lateral outlet of the water distributor: upper water injection layer: the water flow enters the upper lateral outlet from the upstream channel of the main valve 14 and is injected into the upper formation; lower water injection layer: after being regulated by the main valve 14, the water flow flows to the lower lateral outlet near the lower connector 1 and is injected into the lower formation; finally, the water injection flow rate of each layer is precisely matched with the formation water absorption capacity, and the layered water injection operation of this well section is completed.

[0026] However, conventional water distributors are prone to jamming and losing their regulating function, which seriously affects the stratified water injection effect and the needs of stable oilfield production development. They lack the ability to automatically adjust the flow area according to actual downhole water injection pressure and flow rate changes, and to have self-recovery capabilities after abnormal operating conditions. Therefore, this design incorporates an regulating component 4. During use, the injected water first flows into the flange sleeve 401 inside the upper connector 10. As water is continuously injected, the pressure increases, causing the piston rod 402 to overcome the spring force of the return spring 407 and move to the left. The piston rod 402 can then move the circular plate 403. After a period of movement, the circular plate 403 first contacts the stop block 408 at the end of the short rod 405, thereby moving the short rod 405 to the left and pulling it out from inside the flange sleeve 401, allowing water to flow into the outer sleeve 3. If the inlet pressure continues to rise, it indicates that the water cannot fully enter through the inner ring hole of the flange sleeve 401. When water is injected, the water pressure further pushes the piston rod 402 and the circular plate 403, allowing the circular plate 403 to pull the middle rod 405 out of the flange sleeve 401, thus allowing water to flow through the middle ring hole. If the water pressure continues to rise, the long rod 404 will eventually be automatically pulled out of the flange sleeve 401, allowing water to flow through the outer ring hole. This achieves automatic adjustment of the flow area according to different injection pressures. After water injection ends, the return spring 407 can move the circular plate 403 and the piston rod 402 to the right to reset. Then, the circular plate 403 can be pushed back into the flange sleeve 401 by the stop 408 on the outer wall of the long rod 404, the middle rod 405, and the short rod 406 (during the repositioning process, debris blocking the hole can be pushed away). This effectively solves the problem that existing water distribution devices cannot automatically adjust the flow area according to the actual injection pressure and flow rate changes downhole and have self-recovery capabilities after abnormal operating conditions.

[0027] In specific adjustments to the flow area, it is usually necessary to control the trigger value of different flow areas according to the specific pressure changes. This avoids the problem that flow area adjustment can only be performed at a fixed pressure value, which cannot meet the usage requirements. Therefore, this design includes a control component 5. In use, the flow area can be adjusted at a fixed pressure value according to the above scheme. When different positions need to be controlled, the user can do so by rotating the two adjusting bolts 501. For example, rotating the upper adjusting bolt 501 will cause the adjusting bolt 501 to move the end pressure plate 504 to the right, closer to the circular plate 4. Position 03 allows the circular plate 403 to move to the left, which in turn drives all the long rods 404 to move synchronously via the position of the pressure plate 504, the vertical plate 503, and the arc-shaped connecting plate 502. The same principle applies to the adjusting bolt 501 below. This allows the circular plate 403 to push the pressure plate 504 at different positions (different movement distances correspond to different compression states of the return spring 407, which in turn correspond to different water injection pressures), thereby driving the long rods 404 and the middle rod 405 to be pulled out. This effectively avoids the problem that the flow area can only be adjusted under a fixed pressure value, which cannot meet the usage requirements.

[0028] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art will understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. An automatic adjusting and resetting water distributor, comprising a lower connector (1), an outer sleeve (3), and an upper connector (10), wherein the two ends of the outer sleeve (3) are respectively connected to the lower connector (1) and the upper connector (10) by threads, characterized in that: Both sides of the outer wall of the outer sleeve (3) are sealed to the lower connector (1) and the upper connector (10) by O-ring seals (9), and the inner wall of the upper connector (10) is provided with an adjustment component (4). The adjusting assembly (4) includes a flange sleeve (401) and a return spring (407). The flange sleeve (401) can be connected to the upper connector (10) by bolts. The inner wall of the flange sleeve (401) is fitted with a piston column (402). The end of the piston column (402) is fixedly connected to a circular plate (403). The outer, middle and inner sides of the circular plate (403) are slidably connected with multiple long rods (404), middle rods (405) and short rods (406). The outer walls and ends of the long rods (404), middle rods (405) and short rods (406) are all fixedly connected with stop blocks (408). The two sides of the return spring (407) are fixedly connected to the circular plate (403) and the flange sleeve (401) respectively.

2. The automatic adjusting and resetting water distributor according to claim 1, characterized in that: The right ends of the long rod (404), the middle rod (405), and the short rod (406) form a complete arc surface with the inner wall of the flange sleeve (401).

3. The automatic adjusting and resetting water distributor according to claim 1, characterized in that: The inner wall of the outer sleeve (3) is connected to the sealing element fixing device (2) by a hexagonal set screw (11), and the center of the inner wall of the outer sleeve (3) is fixedly connected to the valve seat of the main valve (14).

4. The automatic adjusting and resetting water distributor according to claim 3, characterized in that: The valve disc and central shaft of the main valve (14) are connected to an external motor through a rotating component (6), and a turbine flow meter (15) is installed on the outer wall of the central shaft of the main valve (14).

5. The automatic adjusting and resetting water distributor according to claim 1, characterized in that: A control component (5) is provided at the left end of the flange sleeve (401). The control component (5) includes an arc-shaped connecting plate (502), a first vertical plate (503), and a second vertical plate (505). Each arc-shaped connecting plate (502) can connect the end blocks (408) of the long rod (404), the middle rod (405), and the short rod (406) together. The first vertical plate (503) is fixed to the end face of the block (408) at the end of the long rod (404) on the upper and lower sides. The second vertical plate (505) is fixed to the end face of the block (408) at the end of the middle rod (405) on the upper and lower sides.

6. The automatic adjusting and resetting water distributor according to claim 5, characterized in that: The upper interior of the first vertical plate (503) is threaded with an adjusting bolt (501), and the lower inner wall of the first vertical plate (503) is machined with a hole. The lower interior of the second vertical plate (505) is also threaded with an adjusting bolt (501), and the upper inner wall of the second vertical plate (503) is also machined with a hole. The end of the adjusting bolt (501) is fixed with a pressure plate (504).

7. The automatic adjusting and resetting water distributor according to claim 1, characterized in that: The inner wall of the upper connector (10) is threaded with an intermediate sleeve (7), and the inner wall of the intermediate sleeve (7) is threaded with a circuit board bracket (8).

8. An automatic adjusting and resetting water distributor according to claim 7, characterized in that: The inner wall step of the intermediate sleeve (7) is respectively machined with an upper limit (12) and a lower limit (13).

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