Balanced pressure anti-blocking intelligent stratified polymer injection device

Abstract

The present application relates to a kind of balanced pressure anti-blocking intelligent layered polymer injection device, including polymer injection regulator and lower joint, the polymer channel of polymer injection regulator's polymer injection regulator mechanism is embedded in the polymer channel for adjusting polymer injection in polymer channel is arranged in the lower end surface of the lower joint, polymer injection regulator is also arranged in the lower joint with the polymer channel interval balanced pressure channel, the upper end of balanced pressure channel is communicated with the polymer channel, the lower end of the balanced pressure channel penetrates the lower joint, piston is arranged in the balanced pressure channel, when the polymer channel is closed and opened by the polymer injection regulator mechanism control, the pressure change in polymer channel drives the pre-set liquid in the balanced pressure channel to push and pull the piston up and down movement to balance the pressure in the polymer channel.The present application is injected in the balanced pressure channel before downhole, by changing the volume of pre-set liquid to realize non-contact balanced pressure mode, effectively prevent polymer blockage.

Description

Technical Field

[0001] This invention belongs to the field of oilfield stratified polymer injection technology, specifically relating to a balanced pressure anti-clogging intelligent stratified polymer injection device. Background Technology

[0002] Polymer flooding, a type of tertiary oil recovery technology, involves injecting a water-soluble polymer solution of a certain molecular weight into the oil reservoir to alter the oil-water mobility ratio and expand the swept volume. Successful polymer flooding schemes can generally increase oil recovery by approximately 7%-15%. Two types of polymers are commonly used in polymer flooding projects: one is a synthetic polymer, primarily polyacrylamide polymerized from acrylamide monomers, with partially hydrolyzed polyacrylamide being the most common; the other is a natural polymer, with guar gum being the most frequently used.

[0003] While large-scale polymer flooding in oilfields has achieved increased production, it has also led to numerous problems, including injection difficulties, poor displacement effects, and increased injection pressure. The primary cause of this is blockage in the polymer injection unit, which restricts the application of polymer technology and prevents the effective utilization of production capacity. Dissolving the blockage caused by polymer requires the use of a dissolving agent, which is typically an acidic solution that corrodes and damages the tubing and injection unit. Another method involves retrieving the tubing and instruments from the well, manually unblocking them on the surface, and then re-lowering them into the well. This method is cumbersome, costly, and time-consuming, severely impacting the effectiveness of polymer flooding and failing to meet the dynamic, rapid, and high-frequency requirements of polymer flooding.

[0004] Based on the above requirements, the polymer injection unit should possess the following performance characteristics: 1. It should be able to improve the water absorption profile of polymer injection wells. However, due to limitations imposed by reservoir conditions, severe heterogeneity cannot be completely resolved. The differences in polymer absorption between and within layers in polymer-driven wells are significant, and the phenomenon of polymer solution rushing along high-permeability bands is very common, making partial injection an urgent requirement. 2. Since polymer flooding primarily increases the viscosity of the displacement fluid to enhance oil recovery, and polymer solutions have strong thixotropic properties, they are prone to shear degradation at throttling points. Therefore, maintaining polymer viscosity during partial injection is crucial, requiring the polymer injection unit to possess low-shear performance for polymer injection. 3. The high viscosity of polymers significantly increases the risk of clogging in the polymer injection unit. Therefore, the polymer injection unit should have anti-clogging capabilities to reduce the risk of clogging.

[0005] An electro-hydraulic integrated layered polymer injection device disclosed in publication number CN115726747 A includes a polymer injection switch and a flow regulation and control device connected together. The flow regulation and control device includes an electrical control mechanism and a body.

[0006] The main body has vertical and horizontal channels. The vertical channel includes a main channel, an electrical control mechanism mounting cavity, a hydraulic pressure channel, and a cable passage channel. The horizontal channel includes an inner pressure channel. The electrical control mechanism is installed in the electrical control mechanism mounting cavity and is electrically connected to the cable. The electrical control mechanism mounting cavity is connected to the hydraulic pressure channel through the inner pressure channel. In use, the motor pushes the piston inside the piston chamber downward, compressing the spring and causing the connecting rod and movable water nozzle to move downward. The flow rate is adjusted by changing the gap between the movable water nozzle and the lower connector. When the preset flow rate is reached, the motor automatically stops, completing the adjustment of this layer. The polymer flows from the oil pipe through the gap of the movable water nozzle at the bottom of the polymer injection device, pushing the valve and compressing the lower spring, allowing the polymer to flow from the injection port to the formation. The motor then stops working, and the water nozzle stops moving.

[0007] This type of device uses a single channel to control the polymer flow rate. Although it reduces the risk of polymer blockage to a certain extent, the single channel causes an imbalance in the pressure of the upper and lower polymer channels. The polymer injection can only be controlled and adjusted by an electronic control mechanism, which still makes blockage easy to occur. Summary of the Invention

[0008] To address the aforementioned issues, this invention provides a polymer injection regulator and a balanced pressure anti-clogging intelligent stratified polymer injection device. It employs a non-contact balanced pressure structure, pre-filling a pre-fluid into the balanced pressure channel before running it into the well. By changing the volume of the pre-filled fluid, a non-contact balanced pressure mode is achieved, enabling the polymer injection device to open with a high pressure differential, with continuously adjustable flow rate and the ability to be completely shut off, thus preventing polymer clogging.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A balanced pressure anti-clogging intelligent stratified polymer injection device includes a polymer injection regulator and a lower connector. The lower connector has a polymer channel extending through its lower end face. The polymer injection regulator's adjustment mechanism is embedded within the polymer channel to adjust the polymer injection within the channel. The device is characterized in that: the lower connector also has a balanced pressure channel spaced apart from the polymer channel. The upper end of the balanced pressure channel communicates with the polymer channel, and the lower end of the balanced pressure channel extends through the lower connector. A piston is installed within the balanced pressure channel. When the polymer injection adjustment mechanism controls the opening and closing of the polymer channel, the changing pressure within the polymer channel drives a pre-filled liquid within the balanced pressure channel to push and pull the piston up and down to balance the pressure within the polymer channel.

[0011] Furthermore, a conduit is provided inside the pressure balancing channel, the piston is embedded in the conduit, and the upper end of the conduit communicates with the polymer channel.

[0012] Furthermore, a plug is embedded at the upper end of the pressure balancing channel.

[0013] Furthermore, a retaining ring is provided at the lower end of the pressure balancing channel to prevent the piston from moving out of the pressure balancing channel.

[0014] Furthermore, the retaining ring is nested inside the lower port of the conduit.

[0015] Furthermore, the polymer injection adjustment mechanism includes a push rod, on which a valve core is sleeved. One end of the push rod is provided with an adjusting cone that stops the valve core, and the other end of the push rod is connected to a polymer injection drive mechanism. The polymer injection drive mechanism drives the push rod to move the valve core and the adjusting cone within the polymer channel.

[0016] Furthermore, the adjustable cone is composed of several hammer-like bodies connected in series.

[0017] Furthermore, the polymer channel has chamfered and rounded corners at the diameter change points; the surface finish of the polymer channel is ≤1.6.

[0018] Furthermore, a valve sleeve is embedded within the polymer channel, and a sealing ring and a sealing ring are nested at the lower end of the valve sleeve at the lower end of the polymer channel, while a sealing ring is nested at the upper end of the valve sleeve within the polymer channel.

[0019] Furthermore, it also includes an upper connector, the lower end of which is connected to the upper end of the electromagnetic flow component via an upper connecting pipe, and the upper end of the lower connector is connected to the lower end of the electromagnetic flow component via a lower connecting pipe. A cover plate is provided on the lower connector, and the cover plate covers the outlet of the lower connector.

[0020] Because the present invention adopts the above technical solution, it has the following advantages and effects:

[0021] 1. The polymer injection device of the present invention adopts a non-contact pressure balancing structure. Before going downhole, a pre-filled liquid is injected into the polymer channel and the pressure balancing channel. During the going downhole process, as the pressure increases, the piston moves upward and continuously compresses the pre-filled liquid, so that the pressure at both ends of the piston remains consistent. During the opening and closing of the polymer injection regulator, the internal pre-filled liquid moves and drives the piston to balance the pressure, ensuring that a non-contact pressure balancing mode is achieved during the adjustment of polymer injection. At the same time, the non-contact pressure balancing structure has the function of preventing polymer blockage, ensuring the effectiveness and long-term reliability of the polymer injection device.

[0022] 2. When the piston moves in the balance pressure channel of the polymer injection device of the present invention, it can be used to isolate the polymer injection adjustment mechanism from the unclean polymer in the outside world, so as to provide the polymer injection adjustment mechanism with a clean and pollution-free environment and avoid the polymer injection adjustment mechanism from being unable to adjust due to various downhole dirt and polymer (viscous state), and the instrument becoming unusable.

[0023] 3. The polymer injection device of the present invention is not prone to clogging, thus having a low failure rate, reducing the cost increase and resource waste caused by the tubing string, and effectively reducing production costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the internal structure of the balanced pressure anti-clogging intelligent layered polymer injection device of the present invention.

[0025] Figure 2 This is an enlarged structural diagram of the polymer injection regulator and lower connector assembly of the present invention.

[0026] Figure 3 This is a schematic diagram illustrating the working principle of the polymer injection device of the present invention.

[0027] in Figure 3 (a) is a schematic diagram of the water inlet fully open. Figure 3 (b) Schematic diagram of the water inlet fully closed.

[0028] In the diagram, 101 upper connector, 102 upper connecting pipe, 103 lower connecting pipe, 104 lower connector, 105 cover plate, 106 sealing ring, 107 valve sleeve, 108 sealing ring / retaining ring, 109 sealing ring, 120 plug, 121 conduit, 122 piston, 123 retaining ring, 200 electromagnetic flow assembly, 300 polymer injection regulator, 301 limiting pipe, 302 push rod, 303 valve core, 304 adjusting cone, 321 polymer channel, 322 polymer injection regulating mechanism, 323 polymer injection drive mechanism, 324 balanced pressure channel, 325 outlet, 326 inclined hole, 400 first sensor assembly, 500 second sensor assembly, and 600 main control flow limiting assembly. Detailed Implementation

[0029] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings to provide a clearer understanding of the purpose, features, and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative of the essential spirit of the technical solution of the present invention.

[0030] Existing balanced pressure anti-clogging intelligent stratified polymer injection devices regulate the introduction of polymer liquid through a polymer injection regulator. During the regulation process, due to the high viscosity of the polymer, the pressure within the polymer channel of the regulator often causes blockage and jamming of the polymer injection regulating mechanism, rendering the regulator unable to adjust, the instrument malfunctioning, and unusable. The balanced pressure anti-clogging intelligent stratified polymer injection device provided by this invention has a balanced pressure channel in the lower connector that communicates with the upper end of the polymer channel. A piston is installed in the balanced pressure channel. Before being lowered into the well, a pre-filled liquid is injected into the balanced pressure channel. The piston movement changes the volume of the pre-filled liquid to achieve a non-contact balanced pressure mode, effectively reducing the impact of the polymer injection regulating mechanism on the polymer viscosity. This achieves high pressure differential opening, continuously adjustable flow rate, and complete shut-off, ensuring sealing verification, preventing blockage, and providing low-shear functionality.

[0031] like Figure 1 As shown. This invention provides a balanced pressure anti-clogging intelligent stratified polymer injection device, comprising an upper connector 101 and a lower connector 104. The lower end of the upper connector 101 is connected to the upper end of an electromagnetic flow component 200 via an upper connecting pipe 102. The upper end of the lower connector 104 is connected to the lower end of the electromagnetic flow component 200 via a lower connecting pipe 103. A polymer injection regulator 300 is nested within the lower connector 104. A cover plate 105 is provided on the outer periphery of the lower connector 104, and the cover plate 105 presses against the outlet 325 of the polymer injection regulator 300. Simultaneously, a first sensor component 400, a second sensor component 500, and a main control flow limiting component 600 are also provided on the upper end of the lower connector 104. The first sensor component 400, the second sensor component 500, and the main control flow limiting component 600 are respectively installed on the component channel holes of the lower connector 104. Furthermore, the electromagnetic flowmeter assembly 200 of the present invention comprises electrodes, coils, an insulating sleeve, and a flowmeter body. The insulating sleeve is installed inside the flowmeter body, and the electrodes and coils are fixed to the flowmeter body, all connected by threads and sealed with rubber sealing rings.

[0032] The first sensor assembly 400 comprises a first sensor base, a first sensor retaining ring, a first coil frame, a first circuit board frame, a temperature sensor, a first pressure sensor, and a motor acquisition circuit board. The first pressure sensor is installed in the first sensor base, and after being pressed by the first sensor retaining ring, it is fixed to the first coil frame. The temperature sensor is installed on the first coil frame. The motor acquisition circuit board is fixed to the first circuit board frame with screws, and the first circuit board frame is installed on the first coil frame.

[0033] The second sensor assembly 500 comprises a second sensor base, a second sensor retaining ring, a second circuit board frame, a second pressure sensor, and an electromagnetic flowmeter circuit board. The second pressure sensor is installed in the second sensor base and pressed tightly by the second sensor retaining ring. The electromagnetic flowmeter circuit board is fixed to the second circuit board frame with screws, and the second circuit board frame is mounted on the second sensor base.

[0034] The main control current limiting component 600 consists of a current limiting connector, a main control current limiting circuit board, and insulating posts. The main control current limiting circuit board is fixed to the current limiting connector by screws and insulating posts.

[0035] Furthermore, such as Figure 1 , Figure 2 As shown. The polymer injection regulator 300 includes a polymer injection adjustment mechanism 322 and a polymer injection drive mechanism 323. A polymer channel 321 penetrating the lower end face of the lower connector 104 is provided inside the lower connector 104. The polymer injection adjustment mechanism 322 is provided inside the polymer channel 321, and the polymer injection drive mechanism 323 is located outside the upper end of the lower connector 104. The polymer injection adjustment mechanism 322 adjusts the polymer injection within the polymer channel 321. Simultaneously, the lower connector 104 is also provided with a balancing pressure channel 324 spaced apart from the polymer channel 321. The upper end of the balancing pressure channel 324 communicates with the polymer channel 321, and the lower end of the balancing pressure channel 324 penetrates the lower connector 104. A piston 122 is provided within the balancing pressure channel 324. When the polymer injection adjustment mechanism 322 controls the opening and closing of the polymer channel 321, the changing pressure within the polymer channel 321 causes the pre-filled liquid within the balancing pressure channel 324 to push and pull the piston 122 up and down to balance the pressure within the polymer channel 321.

[0036] Specifically, the polymer channel 321 is a T-shaped structure formed by the continuous connection of an axial channel and a radial channel. The axial channel vertically penetrates the upper and lower end faces of the lower connector 104, and the radial channel horizontally penetrates the outer peripheral surface of the lower connector 104 and connects with the axial channel. The outer side of the radial channel forms the polymer outlet 325. The polymer injection adjustment mechanism 322 is located inside the upper end of the axial channel. The balancing pressure channel 324 is axially and vertically arranged inside the lower connector 104, parallel to and spaced apart from the axial channel. The balancing pressure channel 324 is a blind hole and closed at the upper end. The upper end of the balancing pressure channel 324 is connected to the upper end of the axial channel through an oblique hole. The upper port of the axial channel is connected to the polymer injection adjustment mechanism 322 to form a closed state.

[0037] The polymer injection adjustment mechanism 322 in the polymer channel 321 is connected to the polymer injection drive mechanism 323. The polymer injection drive mechanism 323 controls the polymer injection adjustment mechanism 322 to adjust the polymer to flow from the axial channel through the radial channel out of the outlet 325.

[0038] Furthermore, to ensure smooth and unobstructed movement of the piston 122 within the pressure balance channel 324, a conduit 121 is provided within the pressure balance channel 324. The piston 122 is embedded within the conduit 121, and the upper end of the conduit 121 communicates with the polymer channel 321 through the inclined hole. The lower end of the conduit 121 extends to the lower end of the pressure balance channel 324, and the conduit 121 is tightly fitted and connected to the pressure balance channel.

[0039] Furthermore, in order to ensure the sealing performance of piston 122, an O-ring is provided around the outer periphery of piston 122.

[0040] Furthermore, to prevent the piston 122 from moving out of the conduit 121, a retaining ring 123 is embedded in the lower end of the conduit 121. That is, an arc-shaped groove is provided at the lower end of the conduit 121, and the retaining ring 123 is embedded in the arc-shaped groove to prevent the piston 122 from moving out of the conduit 121.

[0041] Of course, as a preferred option, the retaining ring 123 can also be disposed in the pressure balance channel at the lower end of the conduit 121 and fit against the end of the conduit 121. The inner diameter of the retaining ring 123 is smaller than the inner diameter of the conduit, which is sufficient to block the piston 122.

[0042] Preferably, the pressure balancing channel 324 has a through-hole structure, and a plug 120 is embedded at the upper end of the pressure balancing channel 324 to block the upper end of the pressure balancing channel. This structure is convenient for manufacturing, processing and assembly.

[0043] Furthermore, the polymer injection adjustment mechanism 322 includes a limiting tube 301, a push rod 302, an adjusting cone 304, and a valve core 303. The valve core 303 is sleeved on the push rod 302. One end of the push rod 302 is provided to stop the adjusting cone 304 of the valve core 303. The other end of the push rod 302 is connected to a polymer injection drive mechanism 323. The polymer injection drive mechanism 323 drives the push rod 302 to move the valve core 303 and the adjusting cone 304 in the axial channel within the polymer channel 321. To prevent the valve core 303 from moving out of the axial channel of the polymer channel 321, the limiting tube 301 is provided at the upper end of the axial channel. The upper end of the push rod 302 passes through the limiting tube 301 and is connected to the polymer injection drive mechanism 323. The limiting tube 301, while stopping the valve core 303, together with the push rod 302, closes the upper end of the axial channel. At this time, the end of the inclined hole 326 that connects with the axial channel is located at the lower end of the limiting tube 301, and the end of the inclined hole 326 that connects with the balance pressure channel is higher than the end that connects with the axial channel. The pre-filled liquid is filled in the polymer channel 321 at the upper end of the adjusting cone 304 and the balance pressure channel 324 at the upper end of the piston 122. The pre-filled liquid flows back and forth through the inclined hole 326 at the upper ends of the two polymer channels and the balance pressure channel.

[0044] The injection drive mechanism 323 includes a lead screw and a motor-driven lead screw and nut mechanism. The lead screw is movably connected to the push rod 302. The motor drives the lead screw to rotate, thereby controlling and adjusting the length of the push rod 302 to adjust the position of the cone 304 in the axial channel.

[0045] Furthermore, since the polymer has high viscosity and easily adheres to the regulating cone 304, in order to prevent the regulating cone 304 from contacting the polymer while facilitating the adjustment of the injection volume and reducing the viscosity loss of the injected polymer, the regulating cone 304 is composed of several imitation hammer bodies connected in series, with damping grooves formed between the imitation hammer bodies. The injection volume is adjusted by adjusting the number and gap of the damping grooves between the regulating cone 304 and the outlet 325. This structure of the regulating cone 304 makes it difficult for the polymer to adhere to the regulating cone 304.

[0046] Preferably, the surface of the adjusting cone 304 is sprayed to further improve its anti-adhesion ability.

[0047] Furthermore, in order to reduce the influence of the polymer injection adjustment mechanism 322 on the polymer viscosity, chamfers and rounded corners are provided at the diameter change of the polymer channel 321, and the surface finish of the polymer channel 321 is ≤1.6.

[0048] Furthermore, in order to ensure the sealing performance of the polymer channel 321, a valve sleeve 107 is embedded in the polymer channel 321. The lower end of the valve sleeve 107 is provided with a sealing ring retainer 108 and a sealing ring 109 nested in the lower end of the polymer channel 321, and the upper end of the valve sleeve 107 is provided with a sealing ring 106 nested in the polymer channel 321.

[0049] Specifically, the upper end of the valve sleeve 107 is located at the upper edge of the transverse channel, the radial direction of the valve sleeve 107 is in communication with the transverse channel, the sealing ring 106 seals the upper edge of the valve sleeve 107, the sealing ring 109 seals the lower edge of the valve sleeve 107, and the sealing ring retainer 108 stops the sealing ring 109.

[0050] like Figure 3 As shown in (a) and (b), when the polymer injection regulator 300 is working, the intelligent layered polymer injection device supplies power to the circuit board and motor via cable. By issuing commands, the circuit board controls the motor to move, driving the valve core 303 and the adjusting cone 304 of the polymer injection regulator 300 to move upward (outlet fully open) and downward (outlet fully closed). By adjusting the number and gap of the damping grooves between the adjusting cone 304 and the outlet 325, the injection volume is adjusted. During the opening and closing process of the polymer injection regulator 300, the volume of the internal balance oil (clean liquid pre-injected into the polymer channel 321 and the balance pressure channel 324) changes. The volume change causes the piston 122 in the conduit 121 to move. When the piston 122 moves, it is used to balance the pressure in the polymer channel. At the same time, the piston 122 is also used to isolate the polymer injection regulating mechanism 322 from the unclean polymer in the outside, providing a clean and uncontaminated environment for the polymer injection regulating mechanism. This prevents the polymer injection regulating mechanism from being unable to adjust due to various downhole contaminants and polymers (viscous state), which would cause the instrument to fail and become unusable.

[0051] When installing the polymer injection regulator 300 of the present invention, the sealing ring 108 and the sealing ring 109 are installed sequentially inside the lower side of the polymer channel 321 of the inner polymer injection regulator 300; the sealing ring 106 and the O-ring are installed inside the upper side of the polymer channel 321; after the valve sleeve 107 is installed, the cover plate 105 is used to press the valve sleeve 107 and the cover plate 105 is fixed to the lower connector 104 with screws.

[0052] Then, install O-ring seals on the plug 120, conduit 121, and piston 122 respectively. Install the retaining ring 123 in the arc groove of the conduit 121. Insert the piston 122 from the other end of the conduit 121 and use a tool to push the piston 122 at both ends of the conduit 121 to confirm that the piston 122 moves smoothly and without jamming in the conduit 121. Insert the installed conduit 121 into the channel of the second sensor assembly 500 of the lower connector 104 and screw on the plug 120.

[0053] The internal connecting channels of the upper connector 101, upper connecting pipe 102, electromagnetic flow component 200, lower connecting pipe 103, and lower connector 104 are the central flow channels of the polymer injection device and also the flow channels of the entire tubing. When the polymer flows through the lower connector 104, it enters the polymer channel 321 of the polymer injection regulator 300 after passing through the flow channel of the lower connector 104. After flowing through the regulating cone 304 with adjustable differential pressure, it is injected into the formation through the outlet 325.

[0054] In use, the polymer injection device of this invention delivers multiple intelligent stratified polymer injection devices to predetermined injection layers via tubing (the number of intelligent stratified polymer injection devices is determined according to the number of layers). A communication cable runs along the outer wall of the tubing all the way to the wellhead surface monitoring equipment. Commands are communicated via a host computer and a surface control cabinet. During polymer injection, the polymer reaches the intelligent stratified polymer injection device through the tubing string, flows through the upper connecting pipe 102 into the electromagnetic flow assembly 200, then enters the lower connecting pipe 103, and is divided in two by the lower connector 104. One part enters the next layer, and the other part flows through the polymer channel 321 of the polymer injection regulator 300, through the regulating cone 304, and is injected into the formation through the outlet 325.

[0055] During polymer injection, the electromagnetic flow component 200 measures the amount of polymer injected, while the polymer injection drive mechanism 323 can control the injection volume by adjusting the opening of the polymer injection regulating mechanism 322 via a motor. If the current layer's injection volume is too large, ground control personnel send a command to control the motor to reduce the opening of the polymer injection regulating mechanism 322, thereby reducing the injection volume; conversely, the opening of the polymer injection regulator 300 is increased.

[0056] Because the piston in the pressure balancing channel can balance the pressure in the polymer channel, there is no need for the test vehicle to go to the well site for adjustment throughout the entire process. The entire adjustment does not require contact with the polymer, which greatly reduces labor intensity, saves costs, avoids frequent well start-up operations and multiple instrument operations, reduces polymer flooding costs, and improves polymer flooding performance.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A balanced pressure anti-clogging intelligent stratified polymer injection device, comprising a polymer injection regulator (300) and a lower connector (104), wherein a polymer channel (321) penetrating its lower end face is provided in the lower connector (104), and the polymer injection adjustment mechanism (322) of the polymer injection regulator (300) is embedded in the polymer channel (321) for adjusting the polymer injection within the polymer channel (321), characterized in that: The lower connector (104) is also provided with a pressure balancing channel (324) spaced apart from the polymer channel (321). The upper end of the pressure balancing channel (324) is connected to the polymer channel (321), and the lower end of the pressure balancing channel (324) passes through the lower connector (104). A piston (122) is provided in the pressure balancing channel (324). When the polymer injection adjustment mechanism (322) controls the opening and closing of the polymer channel (321), the changing pressure in the polymer channel (321) drives the pre-filled liquid in the pressure balancing channel (324) to push and pull the piston (122) up and down to balance the pressure in the polymer channel (321). The pressure balancing channel (324) is provided with a conduit (121), the piston (122) is embedded in the conduit (121), and the upper end of the conduit (121) is connected to the polymer channel (321); The lower end of the pressure balance channel (324) is provided with a retaining ring (123) to prevent the piston (122) from moving out of the pressure balance channel (324). The retaining ring (123) is nested inside the lower port of the conduit (121); The polymer injection adjustment mechanism (322) includes a push rod (302), on which a valve core (303) is sleeved. One end of the push rod (302) is provided with an adjusting cone (304) that stops the valve core (303). The other end of the push rod (302) is connected to a polymer injection drive mechanism (323). The polymer injection drive mechanism (323) drives the valve core (303) and the adjusting cone (304) to move within the polymer channel (321) by driving the push rod (302). The polymer channel (321) is fitted with a valve sleeve (107). The lower end of the valve sleeve (107) is provided with a sealing ring retainer (108) and a sealing ring (109) nested in the lower end of the polymer channel (321). The upper end of the valve sleeve (107) is provided with a sealing ring (106) nested in the polymer channel (321).

2. The balanced pressure anti-clogging intelligent stratified polymer injection device according to claim 1, characterized in that: A plug (120) is embedded at the upper end of the pressure balancing channel (324).

3. The balanced pressure anti-clogging intelligent stratified polymer injection device according to claim 2, characterized in that: The adjustable cone (304) is composed of several imitation hammer bodies connected in series.

4. The balanced pressure anti-clogging intelligent stratified polymer injection device according to claim 1, characterized in that: The polymer channel (321) has chamfered and rounded corners at the diameter change point; the surface finish of the polymer channel (321) is ≤1.

6.

5. The balanced pressure anti-clogging intelligent stratified polymer injection device according to claim 4, characterized in that: It also includes an upper connector (101), the lower end of which is connected to the upper end of the electromagnetic flow component (200) via an upper connecting pipe (102), the upper end of the lower connector (104) is connected to the lower end of the electromagnetic flow component (200) via a lower connecting pipe (103), and a cover plate (105) is provided on the lower connector (104), the cover plate (105) covering the outlet (325) of the lower connector (104).

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