A concentric dual-control injection allocator and method of use

Abstract

This invention relates to the field of oil extraction technology, and particularly to a concentric dual-control injector and its usage method. The technical solution is as follows: the upper end of the connecting sleeve is connected to an upper connector, and the lower end is connected to a sealing sleeve. The lower inner wall of the sealing sleeve is connected to the upper end of the outer pipe. An anti-backflow valve and a large spring are installed on the outside of the outer pipe. A small spring, a sand-blocking sleeve, and a regulating valve are installed inside the connecting sleeve. A fixed valve is connected to the inner wall of the sealing sleeve. The inner wall of the fixed valve is fixedly connected to the upper end of the upper central pipe. An outer pipe water passage hole is opened on the upper side of the outer pipe. The lower outer wall is connected to the lower outer pipe. The lower end of the lower outer pipe is connected to a lower connector. The annular space formed between the lower central pipe and the lower outer pipe serves as a battery compartment and a test control compartment. This invention, by employing a concentric motor and cableless test adjustment, combined with concentric measurement and adjustment water distribution, achieves the following: water distribution works until failure, then the measurement and adjustment instrument is lowered, the water distributor is shut off, and the concentric measurement and adjustment water distribution relays the work. Furthermore, the water distributor has a small outer diameter and a large inner diameter, meeting the measurement and adjustment water distribution needs of small wellbore wells.

Description

Technical Field

[0001] This invention relates to the field of oil extraction technology, and in particular to a concentric dual-control injector and its usage method. Background Technology

[0002] Currently, water injection is an effective means of maintaining formation pressure, achieving high and stable oil production, and improving oilfield development efficiency during oil extraction, playing a crucial role in the process. Since most water injection wells are heterogeneous multi-layered reservoirs with significant inter-layer differences and varying water absorption properties, the injection volume of each layer is typically adjusted using a water distributor to achieve balanced displacement water injection, based on the water absorption properties of each layer. With continuous technological advancements, water distributors have evolved from wire-guided core adjustment nozzles to mature systems that periodically adjust water distribution via instruments lowered by wire cables, and more recently, intelligent measurement and adjustment systems using either wired (surface-powered adjustment) or wireless (downhole battery adjustment) systems are still in the exploratory development stage. Due to the conflict between the need for long-term water injection in the field and the relatively immature and short-term use of intelligent measuring and adjusting water distributors, relevant technicians have proposed a mature technical solution combining wireline measuring and adjusting with intelligent measuring and adjusting. For example, the Chinese patent "A Dual-Control Downhole Cabled Intelligent Water Distributor (CN202510868906.3)" features two measuring and control processes that do not interfere with each other, effectively extending the tubing string's lifespan. It is suitable for existing cabled intelligent process tubing strings, adding cable deployment and measurement capabilities to the existing cabled intelligent working cylinder, thus achieving both cabled and simultaneous measuring and adjusting control. This meets the needs of multi-segment layered water injection, precise injection distribution, and real-time measuring and adjusting. However, this solution still has the following problems: The motor and the testing and adjustment instrument are offset, and the water injection flow channel has an eccentric structure. This makes it easy for the testing and adjustment instrument to get stuck or obstructed when it is lowered into the cable. This makes it impossible to perform effective testing and adjustment or to carry out major repairs on the water injection well after the testing and adjustment is blocked. In addition, the eccentric structure of the water injection channel results in a large outer diameter of the entire water distributor, which cannot meet the intelligent injection needs of small casing wells. If the cable-connected intelligent measurement and adjustment suddenly fails, the water tap of the intelligent water distributor, which has already been turned on, will remain open and cannot be automatically turned off. Subsequent measurement and adjustment through the downstream measurement and adjustment instrument will be affected by the previous intelligent water distributor and will not be able to accurately dispense water. Cable-connected intelligent water injection is expensive because it requires disconnection and reconnection at the water distributor and packer, resulting in numerous points of failure in the power supply and communication systems of intelligent water injection. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned deficiencies in existing technologies by providing a concentric dual-control injector and its usage method. This invention combines a concentric motor with cableless testing and adjustment, along with a concentric measuring and adjusting water distribution system, to achieve water distribution operation until failure, followed by the insertion of the measuring and adjusting instrument, shutdown of the water distributor, and relay operation of the concentric measuring and adjusting water distribution system. Furthermore, the water distributor has a small outer diameter and a large inner diameter, meeting the measuring and adjusting water distribution requirements of small-bore wells.

[0004] The present invention discloses a concentric dual-control dispensing device, the technical solution of which includes an upper connector, a connecting sleeve, a small spring, a sand-blocking sleeve, an adjusting valve, a sealing sleeve, a fixing valve, an upper central tube, an outer tube, an anti-backflow valve, a large spring, a lower adjusting sleeve, a concentric motor rotor, a concentric motor stator, a lower outer tube, a lower central tube, a battery compartment, a test control compartment, and a lower connector. The upper end of the connecting sleeve is connected to the upper connector, and the lower end of the connecting sleeve is connected to the sealing sleeve. The lower inner wall of the sealing sleeve is connected to the upper end of the outer pipe. An anti-backflow valve and a large spring are installed on the outside of the outer pipe. Under the action of the lower large spring, the upper end of the anti-backflow valve cooperates with the lower end of the sealing sleeve to open and close. A small spring, a sand-blocking sleeve, and a regulating valve are installed inside the connecting sleeve. A fixed valve is connected to the inner wall of the sealing sleeve. The inner wall of the fixed valve is fixedly connected to the upper end of the upper central pipe. The lower end of the upper central pipe is connected to the lower end of the outer pipe. An outer pipe water passage hole is opened on the upper side of the outer pipe. The lower outer wall of the outer pipe is connected to the lower outer pipe. The lower end of the lower outer pipe is connected to the lower connector. The inner wall of the lower connector is connected to the lower central tube. The annular space formed between the lower central tube and the lower outer tube is the battery compartment and the test control compartment. The upper end of the lower central tube is connected to the stator of the concentric motor, and the upper end of the stator of the concentric motor is connected to the rotor of the concentric motor. The upper end of the rotor of the concentric motor is connected to the lower adjusting sleeve, which drives the lower adjusting sleeve to move up and down relative to the upper central tube, adjusting the opening of the fixed water distribution groove hole on the upper central tube. After the injected water passes through the fixed water distribution groove hole, it flows into the annular space between the upper central tube and the outer tube, and through the water passage hole of the outer tube, pushes the anti-backflow valve to compress the large spring, opening the first water injection channel.

[0005] Preferably, the inner cavity of the upper connector is provided with a positioning switch fixing groove for connecting with the mechanical claw of the measuring and adjusting instrument.

[0006] Preferably, the aforementioned regulating valve is installed in the lower middle part of the inner cavity of the connecting sleeve and is connected in conjunction with the fixed valve. When the battery is low on power or other abnormal conditions prevent it from working properly, the measuring and adjusting instrument is lowered in. By rotating the regulating valve, the overlapping area of ​​the grooves on the regulating valve and the fixed valve is adjusted to adjust the size of the water nozzle area, thereby adjusting the water injection volume. After the injected water passes through the fixed valve, it flows along the water flow channels of the regulating valve and the fixed valve into the annulus between the upper central pipe and the outer pipe. Through the water passage of the outer pipe, it pushes the anti-backflow valve to compress the large spring and open the second water injection channel.

[0007] Preferably, the aforementioned upper central pipe includes a fixed water distribution groove hole, an upper central pipe body, an upper central pipe lower connector, an upper central pipe limiting protrusion, and an upper central pipe upper connector. The upper end of the upper central pipe body is provided with an upper central pipe upper connector, and the lower end is provided with an upper central pipe limiting protrusion and an upper central pipe lower connector. A fixed water distribution groove hole is provided on the upper side wall of the upper central pipe lower connector, and the lower end of the upper central pipe lower connector is movably connected to a lower adjusting sleeve. By adjusting the position of the lower adjusting sleeve, the opening size of the fixed water distribution groove hole on the upper central pipe can be adjusted.

[0008] Preferably, a ceramic sleeve and a fixing adhesive are installed at the fixed water distribution groove hole of the upper central tube to achieve a seal for the fixed water distribution groove hole.

[0009] Preferably, a retaining ring is installed between the concentric motor stator and the concentric motor rotor, and the concentric motor rotor is fixed to the lower adjusting sleeve by a concave-convex connection.

[0010] Preferably, the inner wall of the regulating valve is provided with two sets of arc-shaped regulating valve water flow channels, and the inner wall of the fixed valve is provided with two sets of arc-shaped fixed valve water flow channels. When the two are connected, the injected water flows down along the regulating valve water flow channel and through the fixed valve water flow channel into the annulus between the upper central pipe and the outer pipe, and then through the water passage of the outer pipe, pushes the anti-backflow valve to compress the large spring and opens the second water injection channel.

[0011] Preferably, a sand-blocking sleeve is installed at the upper end of the aforementioned regulating valve. The lower end limiting protrusion of the sand-blocking sleeve forms a liquid-passing ring cavity between the connecting sleeve and the regulating valve. A small spring is installed on the upper side of the lower end limiting protrusion of the sand-blocking sleeve. The upper end of the small spring contacts the upper step of the inner wall of the connecting sleeve. The small spring pushes the sand-blocking sleeve to continuously apply pressure to the upper end of the regulating valve.

[0012] Preferably, the upper outer side of the aforementioned anti-backflow valve has an arc-shaped structure, which is used to cooperate with the inclined structure at the lower end of the sealing sleeve to achieve the anti-backflow sealing function; a large spring is installed at the lower end of the anti-backflow valve, and the large spring continuously applies spring force to the anti-backflow valve. When the pressure of the injected water is greater than the spring force of the large spring, the anti-backflow valve moves downward to open; when the pressure of the injected water is less than the spring force of the large spring, the anti-backflow valve moves upward to close.

[0013] The method of using the concentric dual-control dispensing device mentioned in this invention includes the following steps: (a) When the concentric motor is supplied with cable: First, the slots of the regulating valve and the fixed valve on the upper side of the injector are offset, and the contact surface is mirror-sealed. They are pressed together by a small spring. The batteries in the downhole battery compartment supply power to the concentric motor and the test control system. The concentric motor is started, and the number of revolutions of the concentric motor rotor in the forward or reverse direction is controlled, which drives the lower regulating sleeve to rotate. This causes the lower regulating sleeve to move up and down relative to the upper central tube, adjusting the opening of the fixed water distribution slot on the upper central tube to adjust the amount of water injected. After the injected water passes through the fixed water distribution slot, it flows into the annulus between the upper central tube and the outer tube, and then through the water passage of the outer tube. When the pressure of the injected water is greater than the spring force of the large spring, it pushes the anti-backflow valve to compress the large spring, opening the first water injection channel to achieve injection. (II) Concentric water distribution relay injection: When the concentric motor malfunctions due to battery depletion or other abnormalities, the matching measuring and adjusting instrument is lowered into position. When the measuring and adjusting instrument reaches the position of the concentric dual-control dispenser, the mechanical claw on the measuring and adjusting instrument engages in the positioning switch fixing slot of the upper connector. Then, the mechanical claw on the measuring and adjusting instrument engages in the groove inside the lower adjusting sleeve to rotate and close the fixed water distribution slot on the upper central tube. Next, the mechanical claw on the measuring and adjusting instrument engages in the rotating switch fixing slot of the regulating valve. By rotating the regulating valve, the overlapping area of ​​the slots on the regulating valve and the fixed valve is adjusted to regulate the water injection volume. After the injected water passes through the fixed valve, it flows into the annulus between the upper central tube and the outer tube. Through the water passage of the outer tube, it pushes the anti-backflow valve to compress the large spring, opening the second water injection channel to achieve relay injection. (iii) When stopping injection, prevent backflow: When water injection stops, the anti-backflow valve presses against the sealing sleeve under the action of the large spring, closing the channel for formation fluid to enter the injector and preventing formation fluid and formation debris from flowing back into the injector and clogging it.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention adopts a concentric motor, an annular battery compartment, and an annular test and control compartment, which has a simple structure, clear functions, and convenient assembly and installation; it is easy to install and lower into the field, and after the water distributor is in place, subsequent testing and adjustment instruments are not easily blocked when passing through the inside of the water distributor; in addition, the optimized concentric motor can further realize a small outer diameter and a large inner diameter, which can meet the injection requirements of small casing wells. 2. This invention adopts a cableless concentric water distribution and concentric measurement and adjustment water distribution relay operation, which is conducive to the long service life of the downhole water distributor; and the subsequent installation of the measurement and adjustment instrument can effectively shut down the cableless concentric water distribution system, effectively ensuring that the two systems operate without interference. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 yes Figure 1 Schematic diagram of section AA in the diagram; Figure 3 yes Figure 1 Schematic diagram of the BB section in the diagram; Figure 4 yes Figure 1 Schematic diagram of the CC section in the diagram; Figure 5 yes Figure 1 Schematic diagram of the DD section in the diagram; Figure 6 yes Figure 1 Schematic diagram of the EE section in the diagram; Figure 7 This is a schematic diagram showing the connection between the upper central tube and the lower adjusting sleeve; Figure 8 This is a schematic diagram of the structure after the lower adjusting sleeve has been adjusted to the desired position; Figure 9 This is a schematic diagram of water injection, which is achieved by the movement of the adjusting sleeve under the drive of the concentric motor rotor, thus opening the first water injection channel; Figure 10 This is a schematic diagram of water injection, which is achieved by the measuring and adjusting instrument driving the regulating valve to move, thus opening the second water injection channel; Figure 11 This is a diagram illustrating the prevention of backflow when water injection is stopped; In the diagram: 1. Upper connector; 2. Connecting sleeve; 3. Small spring; 4. Sand baffle sleeve; 5. Adjusting valve; 6. Sealing sleeve; 7. Fixing valve; 8. Upper center tube; 9. Outer tube; 10. Anti-reverse valve; 11. Large spring; 12. Fixing adhesive; 13. Ceramic sleeve; 14. Lower adjusting sleeve; 15. Concentric motor rotor; 16. Retaining ring; 17. Concentric motor stator; 18. Lower outer tube; 19. Lower center tube; 20. Battery compartment; 21. Test control compartment; 22. Lower connector. Positioning switch fixing slot 1.1, rotary switch fixing slot hole 5.1, regulating valve water flow channel 5.2, fixing valve water flow channel 7.1, fixing water distribution slot hole 8.1, upper central pipe body 8.2, upper central pipe lower connector 8.3, upper central pipe limiting protrusion 8.4, upper central pipe upper connector 8.5, outer pipe water passage hole 9.1, concave-convex connection 15.1. Detailed Implementation

[0016] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0017] Example 1, referring to Figures 1-11The present invention discloses a concentric dual-control dispensing device, comprising an upper connector 1, a connecting sleeve 2, a small spring 3, a sand-blocking sleeve 4, an adjusting valve 5, a sealing sleeve 6, a fixing valve 7, an upper central tube 8, an outer tube 9, an anti-backflow valve 10, a large spring 11, a lower adjusting sleeve 14, a concentric motor rotor 15, a concentric motor stator 17, a lower outer tube 18, a lower central tube 19, a battery compartment 20, a test control compartment 21, and a lower connector 22. The upper end of the connecting sleeve 2 is connected to the upper connector 1, and the lower end of the connecting sleeve 2 is connected to the sealing sleeve 6. The lower inner wall of the sealing sleeve 6 is connected to the upper end of the outer pipe 9. An anti-backflow valve 10 and a large spring 11 are installed on the outside of the outer pipe 9. Under the action of the lower large spring 11, the upper end of the anti-backflow valve 10 cooperates with the lower end of the sealing sleeve 6 to open and close. A small spring 3, a sand-blocking sleeve 4, and a regulating valve 5 are installed inside the connecting sleeve 2. A fixed valve 7 is connected to the inner wall of the sealing sleeve 6. The inner wall of the fixed valve 7 is fixedly connected to the upper end of the upper central pipe 8. The lower end of the upper central pipe 8 is connected to the lower end of the outer pipe 9. An outer pipe water passage hole 9.1 is opened on the upper side of the outer pipe 9. The lower outer wall of the outer pipe 9 is connected to the lower outer pipe 18. The lower end of the lower outer pipe 18 is connected to the outer wall of the lower connector 22. The inner wall of connector 22 is connected to the lower central tube 19. The annular space formed between the lower central tube 19 and the lower outer tube 18 is the battery compartment 20 and the test control compartment 21. The upper end of the lower central tube 19 is connected to the concentric motor stator 17. The upper end of the concentric motor stator 17 is connected to the concentric motor rotor 15. The upper end of the concentric motor rotor 15 is connected to the lower adjusting sleeve 14, which drives the lower adjusting sleeve 14 to move up and down relative to the upper central tube 8. The opening of the fixed water distribution groove hole 8.1 on the upper central tube 8 is adjusted. After the water is injected through the fixed water distribution groove hole 8.1, it flows into the annular space between the upper central tube 8 and the outer tube 9. Through the water passage hole 9.1 of the outer tube, it pushes the anti-backflow valve 10 to compress the large spring 11 and opens the first water injection channel.

[0018] Reference Figure 2 The upper connector 1 mentioned in this invention has a positioning switch fixing groove 1.1 in its inner cavity for connecting with the mechanical claw of the measuring and adjusting instrument.

[0019] Reference Figure 1 The regulating valve 5 mentioned in this invention is installed in the lower middle part of the inner cavity of the connecting sleeve 2 and is connected in conjunction with the fixed valve 7. When the battery is low on power or other abnormal conditions prevent it from working properly, the measuring instrument is lowered in. By rotating the regulating valve 5, the overlapping area of ​​the groove on the regulating valve 5 and the fixed valve 7 is adjusted to adjust the size of the water nozzle area, thereby adjusting the water injection volume. After the injected water passes through the fixed valve 7, it flows into the annulus between the upper central pipe 8 and the outer pipe 9 along the water flow channel 5.2 of the regulating valve and the water flow channel 7.1 of the fixed valve. Through the water passage 9.1 of the outer pipe, it pushes the anti-backflow valve 10 to compress the large spring 11 and open the second water injection channel.

[0020] Reference Figures 7-8The upper central tube 8 mentioned in this invention includes a fixed water distribution groove hole 8.1, an upper central tube body 8.2, an upper central tube lower connector 8.3, an upper central tube limiting protrusion 8.4, and an upper central tube upper connector 8.5. The upper central tube body 8.2 has an upper central tube upper connector 8.5 at its upper end and an upper central tube limiting protrusion 8.4 and an upper central tube lower connector 8.3 at its lower end. The upper side wall of the upper central tube lower connector 8.3 has a fixed water distribution groove hole 8.1, and the lower end of the upper central tube lower connector 8.3 is movably connected to the lower adjusting sleeve 14. By adjusting the position of the lower adjusting sleeve 14, the opening size of the fixed water distribution groove hole 8.1 on the upper central tube 8 can be adjusted.

[0021] Among them, a ceramic sleeve 13 and a fixing adhesive 12 are installed at the fixed water distribution groove hole 8.1 of the upper central tube 8 to achieve a seal for the fixed water distribution groove hole 8.1.

[0022] Among them, a retaining ring 16 is installed between the concentric motor stator 17 and the concentric motor rotor 15, and the concentric motor rotor 15 is fixed to the lower adjusting sleeve 14 by a concave-convex connection 15.1.

[0023] Reference Figure 1 The regulating valve 5 mentioned in this invention has two sets of arc-shaped regulating valve water flow channels 5.2 on its inner wall, and the fixed valve 7 has two sets of arc-shaped fixed valve water flow channels 7.1 on its inner wall. When the two are connected, the injected water flows down along the regulating valve water flow channel 5.2 and through the fixed valve water flow channel 7.1 into the annulus between the upper central pipe 8 and the outer pipe 9, and then through the water passage 9.1 of the outer pipe, pushes the anti-backflow valve 10 to compress the large spring 11 and opens the second water injection channel.

[0024] Among them, the upper end of the regulating valve 5 is equipped with a sand-blocking sleeve 4. The lower end limiting protrusion of the sand-blocking sleeve 4 forms a liquid-passing ring cavity between the connecting sleeve 2 and the regulating valve 5. A small spring 3 is installed on the upper side of the lower end limiting protrusion of the sand-blocking sleeve 4. The upper end of the small spring 3 contacts the upper step of the inner wall of the connecting sleeve 2. The small spring 3 pushes the sand-blocking sleeve 4 to continuously apply pressure to the upper end of the regulating valve 5.

[0025] In addition, the upper outer side of the aforementioned anti-backflow valve 10 has an arc-shaped structure, which is used to cooperate with the inclined structure at the lower end of the sealing sleeve 6 to achieve the anti-backflow sealing function; a large spring 11 is installed at the lower end of the anti-backflow valve 10, and the large spring 11 continuously applies spring force to the anti-backflow valve 10. When the pressure of the injected water is greater than the spring force of the large spring 11, the anti-backflow valve 10 moves downward to open; when the pressure of the injected water is less than the spring force of the large spring 11, the anti-backflow valve 10 moves upward to close.

[0026] The method of using the concentric dual-control dispensing device mentioned in this invention includes the following steps: (a) When the concentric motor is supplied with cable: First, the slots of the regulating valve 5 and the fixed valve 7 on the upper side of the injector are staggered, and the contact surface is mirror-sealed. They are pressed by the small spring 3. The batteries in the downhole battery compartment 20 supply power to the concentric motor and the test control system respectively. The concentric motor is started, and the number of revolutions of the concentric motor rotor 15 in the forward or reverse direction is controlled, which drives the lower regulating sleeve 14 to rotate, so that the lower regulating sleeve 14 moves up and down relative to the upper central tube 8. The opening of the fixed water distribution slot hole 8.1 on the upper central tube 8 is adjusted to adjust the amount of water injected. After the injected water passes through the fixed water distribution slot hole 8.1, it flows into the annulus between the upper central tube 8 and the outer tube 9, and then through the water passage hole 9.1 of the outer tube. When the pressure of the injected water is greater than the spring force of the large spring 11, the anti-backflow valve 10 is pushed to compress the large spring 11, and the first water injection channel is opened to realize the injection. (II) Concentric water distribution relay injection: When the concentric motor malfunctions due to battery depletion or other abnormalities, a matching measuring and adjusting device is lowered into position. When the measuring and adjusting device reaches the position of the concentric dual-control dispenser, the mechanical claw on the measuring and adjusting device engages in the positioning switch fixing groove 1.1 of the upper connector 1. Then, the mechanical claw on the measuring and adjusting device engages in the groove within the lower adjusting sleeve 14, rotating to close the fixed water distribution slot hole 8.1 on the upper central tube 8. Next, the mechanical claw on the measuring and adjusting device engages in the rotary switch fixing groove hole 5.1 of the regulating valve 5, and by rotating the regulating valve 5, the overlapping area of ​​the grooves on the regulating valve 5 and the fixed valve 7 is adjusted to regulate the water injection volume. After the injected water passes through the fixed valve 7, it flows into the annulus between the upper central tube 8 and the outer tube 9, and through the water passage hole 9.1 of the outer tube, pushes the anti-backflow valve 10 to compress the large spring 11, opening the second water injection channel to achieve relay dispensing. (iii) When stopping injection, prevent backflow: When water injection stops, the anti-backflow valve 10 presses against the sealing sleeve 6 under the action of the large spring 11, closing the channel for formation fluid to enter the injector and preventing formation fluid and formation debris from being backflowed into the injector and clogging it.

[0027] The above description is merely a partial preferred embodiment of the present invention. Any person skilled in the art can modify the above-described technical solutions or modify them into equivalent technical solutions. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A concentric dual-control dispensing device, comprising an upper connector (1), characterized in that: It also includes a connecting sleeve (2), a small spring (3), a sand-blocking sleeve (4), a regulating valve (5), a sealing sleeve (6), a fixing valve (7), an upper central tube (8), an outer tube (9), an anti-reverse valve (10), a large spring (11), a lower regulating sleeve (14), a concentric motor rotor (15), a concentric motor stator (17), a lower outer tube (18), a lower central tube (19), a battery compartment (20), a test control compartment (21), and a lower connector (22). The upper end of the connecting sleeve (2) is connected to the upper connector (1), and the lower end of the connecting sleeve (2) is connected to the sealing sleeve (6). The lower inner wall of the sealing sleeve (6) is connected to the upper end of the outer tube (9). An anti-return valve (10) and a large spring (11) are installed on the outside of the outer tube (9). Under the action of the lower large spring (11), the upper end of the anti-return valve (10) cooperates with the lower end of the sealing sleeve (6) to open and close. A small spring (3), a sand-blocking sleeve (4), and a regulating valve (5) are installed inside the connecting sleeve (2). A fixed valve (7) is connected to the inner wall of the sealing sleeve (6). The upper end of the fixed valve (7) is fixedly connected to the upper end of the upper central tube (8). The lower end of the upper central tube (8) is connected to the lower end of the outer tube (9). An outer tube water passage hole (9.1) is opened on the upper side of the outer tube (9). The lower outer wall of the outer tube (9) is connected to the lower outer tube (18). The lower end of the lower outer tube (18) is connected to the lower connector (22). The outer wall of the lower connector (22) is connected to the inner wall of the lower central tube (19). The annular space formed between the lower central tube (19) and the lower outer tube (18) is the battery compartment (20) and the test control compartment (21). The upper end of the lower central tube (19) is connected to the concentric motor stator (17), the upper end of the concentric motor stator (17) is connected to the concentric motor rotor (15), and the upper end of the concentric motor rotor (15) is connected to the lower adjusting sleeve (14), which drives the lower adjusting sleeve (14) to move up and down relative to the upper central tube (8), adjusting the opening of the fixed water distribution slot hole (8.1) on the upper central tube (8). After the water is injected through the fixed water distribution slot hole (8.1), it flows into the annular space between the upper central tube (8) and the outer tube (9), and through the water passage hole (9.1) of the outer tube, pushes the anti-backflow valve (10) to compress the large spring (11) and open the first water injection channel.

2. The concentric dual-control dispensing device according to claim 1, characterized in that: The inner cavity of the upper connector (1) is provided with a positioning switch fixing groove (1.1) for connecting with the mechanical claw of the measuring and adjusting instrument.

3. The concentric dual-control dispensing device according to claim 2, characterized in that: The regulating valve (5) is installed in the lower middle part of the inner cavity of the connecting sleeve (2) and is connected to the fixed valve (7). When the battery is out of power or other abnormal conditions prevent it from working properly, the measuring instrument is lowered in. By rotating the regulating valve (5), the overlapping area of ​​the groove on the regulating valve (5) and the fixed valve (7) is adjusted to adjust the size of the water nozzle area and realize the adjustment of the water injection volume. After the injected water passes through the fixed valve (7), it flows into the annulus between the upper central pipe (8) and the outer pipe (9) along the water flow channel (5.2) of the regulating valve and the water flow channel (7.1) of the fixed valve. Through the water passage (9.1) of the outer pipe, it pushes the anti-backflow valve (10) to compress the large spring (11) and open the second water injection channel.

4. The concentric dual-control dispensing device according to claim 3, characterized in that: The upper central tube (8) includes a fixed water distribution groove hole (8.1), an upper central tube body (8.2), an upper central tube lower connector (8.3), an upper central tube limiting protrusion (8.4), and an upper central tube upper connector (8.5). The upper end of the upper central tube body (8.2) is provided with an upper central tube upper connector (8.5), and the lower end is provided with an upper central tube limiting protrusion (8.4) and an upper central tube lower connector (8.3). The upper side wall of the upper central tube lower connector (8.3) is provided with a fixed water distribution groove hole (8.1), and the lower end of the upper central tube lower connector (8.3) is movably connected to the lower adjusting sleeve (14). By adjusting the position of the lower adjusting sleeve (14), the opening size of the fixed water distribution groove hole (8.1) on the upper central tube (8) can be adjusted.

5. The concentric dual-control dispensing device according to claim 4, characterized in that: A ceramic sleeve (13) and a fixing adhesive (12) are installed at the fixed water distribution groove hole (8.1) of the upper central tube (8) to achieve a seal for the fixed water distribution groove hole (8.1).

6. The concentric dual-control dispensing device according to claim 5, characterized in that: A retaining ring (16) is installed between the concentric motor stator (17) and the concentric motor rotor (15), and the concentric motor rotor (15) is fixed to the lower adjusting sleeve (14) by a concave-convex connection (15.1).

7. The concentric dual-control dispensing device according to claim 6, characterized in that: The inner wall of the regulating valve (5) is provided with two sets of arc-shaped regulating valve water flow channels (5.2), and the inner wall of the fixed valve (7) is provided with two sets of arc-shaped fixed valve water flow channels (7.1). When the two are connected, the injected water flows down along the regulating valve water flow channel (5.2) and passes through the fixed valve water flow channel (7.1) to enter the annulus between the upper central pipe (8) and the outer pipe (9), and then through the water passage (9.1) of the outer pipe, pushes the anti-backflow valve (10) to compress the large spring (11) and open the second water injection channel.

8. The concentric dual-control dispensing device according to claim 7, characterized in that: A sand-blocking sleeve (4) is installed on the upper end of the regulating valve (5). The lower end limiting protrusion of the sand-blocking sleeve (4) forms a liquid-passing ring cavity between the connecting sleeve (2) and the regulating valve (5). A small spring (3) is installed on the upper side of the lower end limiting protrusion of the sand-blocking sleeve (4). The upper end of the small spring (3) contacts the upper step of the inner wall of the connecting sleeve (2). The small spring (3) pushes the sand-blocking sleeve (4) to continuously apply pressure to the upper end of the regulating valve (5).

9. The concentric dual-control dispensing device according to claim 8, characterized in that: The upper outer side of the anti-backflow valve (10) is an arc-shaped structure, which is used to cooperate with the inclined structure at the lower end of the sealing sleeve (6) to realize the anti-backflow sealing function; a large spring (11) is installed at the lower end of the anti-backflow valve (10). The large spring (11) continuously applies spring force to the anti-backflow valve (10). When the pressure of the injected water is greater than the spring force of the large spring (11), the anti-backflow valve (10) moves downward to open; when the pressure of the injected water is less than the spring force of the large spring (11), the anti-backflow valve (10) moves upward to close.

10. A method of using the concentric dual-control dispensing device as described in claim 9, characterized in that... The process includes the following: (a) When the concentric motor is supplied with cable: First, the slots of the regulating valve (5) and the fixed valve (7) on the upper side of the injector are staggered, and the contact surface is mirror-sealed. They are pressed by the small spring (3). The batteries in the battery compartment (20) in the well provide power to the concentric motor and the test control system respectively. The concentric motor is started, and the number of revolutions of the concentric motor rotor (15) in the forward or reverse direction is controlled, which drives the lower regulating sleeve (14) to rotate, so that the lower regulating sleeve (14) moves up and down relative to the upper central tube (8). The opening size of the fixed water distribution slot hole (8.1) on the upper central tube (8) is adjusted to realize the adjustment of the water injection volume. After the injected water passes through the fixed water distribution slot hole (8.1), it flows into the annulus between the upper central tube (8) and the outer tube (9), and then through the water passage hole (9.1) of the outer tube. When the pressure of the injected water is greater than the spring force of the large spring (11), the anti-backflow valve (10) is pushed to compress the large spring (11) and open the first water injection channel to realize the injection. (II) Concentric water distribution relay injection: When the concentric motor cannot work properly due to battery power shortage or other abnormal conditions, the matching measuring and adjusting instrument is lowered. When the measuring and adjusting instrument is lowered to the position of the concentric dual-control dispenser, the mechanical claw on the measuring and adjusting instrument is fixed in the positioning switch fixing groove (1.1) of the upper connector (1). Then, the mechanical claw on the measuring and adjusting instrument is first fixed in the groove of the lower adjusting sleeve (14) and rotated to close the fixed water distribution slot hole (8.1) on the upper central tube (8). Then, the mechanical claw on the measuring and adjusting instrument is fixed in the rotary switch fixing slot hole (5.1) of the regulating valve (5). By rotating the regulating valve (5), the overlapping area of ​​the groove on the regulating valve (5) and the fixed valve (7) is adjusted to realize the adjustment of the water injection volume. After the injected water passes through the fixed valve (7), it flows into the annulus between the upper central tube (8) and the outer tube (9). Through the water passage hole (9.1) of the outer tube, it pushes the anti-backflow valve (10) to compress the large spring (11) and opens the second water injection channel to realize relay injection. (iii) When stopping injection, prevent backflow: When water injection stops, the anti-backflow valve (10) presses against the sealing sleeve (6) under the action of the large spring (11), closing the channel for formation fluid to enter the injector and preventing formation fluid and formation debris from being backflowed into the injector and clogging it.

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