Intelligent injection regulator, use method and water injection and oil production string

Abstract

This invention discloses an intelligent injector, its usage method, and a water injection oil production tubing string. The intelligent injector includes a connector assembly and an injector body. A water injection hole is opened on one side of the connector assembly, and a valve chamber is provided inside the connector assembly. The water injection hole communicates with the middle of the valve chamber. The connector assembly also has a radial water inlet chamber, and the bottom of the valve chamber communicates with the radial water inlet chamber. The injector body is disposed within the valve chamber. The injector body includes a porous valve and a valve seat. The porous valve includes a valve head and a one-way valve fixed from top to bottom. In its initial position, the porous valve head and the valve seat are in sealing contact, causing the valve head to block the water injection hole. When using the intelligent injector of this invention, because the intelligent water injector and the oil production tubing string have a large diameter, the number of layers used is not limited by the size of the ball seat and pressure ball of traditional injectors, thus improving production efficiency and having great engineering practical value.

Description

Technical Field

[0001] This invention relates to the field of oilfield stratified water injection technology, and in particular to an intelligent injector, its usage method, and a water injection oil production tubing string. Background Technology

[0002] Currently, most oilfields are heterogeneous, multi-layered sandstone reservoirs. The various oil layers have significant differences between layers, in planes, and within layers. Implementing layered water injection and production in oil wells is an effective measure to achieve long-term high and stable production in oilfields and to improve the waterless recovery rate and ultimate recovery rate. Figure 1 A schematic diagram of an existing water injection production tubing string is shown, including tubing 1, pump 2, hanger 3, packer 4, injector 6, production mixer 5, and guide head 7. Injector 6 is used to inject water into the formation, and production mixer 5 is used for oil production.

[0003] Traditional water injection units include two structural forms: differential pressure opening type and ball-drop opening type, which are widely used in major oilfields. In traditional water injection production tubing, the bottom end uses a differential pressure opening type, while the remaining layers use ball-drop opening type units. During water injection, after opening the first-stage differential pressure unidirectional injector, a higher pressure cannot be generated again within the tubing; therefore, the remaining injectors are opened using a ball-drop method. Existing ball-drop type injectors require the insertion of a soluble ball matching the injector's ball seat size before opening. Once the ball reaches the ball seat, high pressure is generated within the tubing. The resulting pressure difference between the inside and outside of the injector moves the inner shear pin, opening the injection channel and achieving stratified water injection.

[0004] However, for ball-operated open-type dispensers, the size of the ball seat is progressively smaller, and the number of balls that can be accommodated in the ball seat is limited. Therefore, the number of water injection layers and the discharge volume are limited, making it difficult to meet the needs of multi-level water injection. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides an intelligent injection device, a method of use, and a water injection oil production tubing string.

[0006] To achieve the above objectives, the present invention provides an intelligent dispensing device, including a connector assembly and a dispensing device body;

[0007] A water injection hole is provided on one side of the connector assembly, and a valve chamber is provided inside the connector assembly. The water injection hole communicates with the middle of the valve chamber. The connector assembly also has a radial water inlet chamber, and the bottom of the valve chamber communicates with the radial water inlet chamber.

[0008] The dispensing device body is disposed in the valve cavity. The dispensing device body includes a porous valve and a valve seat. The porous valve includes a valve head and a one-way valve fixed from top to bottom.

[0009] The valve seat is disposed at the bottom of the valve cavity and is in sealing contact with the valve cavity; the one-way valve, the valve seat, and the radial water inlet cavity form an axial cavity.

[0010] When the porous valve is in its initial position, the valve head and the valve seat make a sealing contact, causing the valve head to block the water inlet hole;

[0011] The porous valve has a water-expanding part inside, and the valve head can move away from the valve seat along the valve cavity under water pressure.

[0012] Furthermore, the dispensing device body also includes an elastic part and an elastic seat;

[0013] One end of the elastic seat is fixed to the top of the valve cavity, and the other end of the elastic seat is elastically connected to the upper part of the elastic part;

[0014] The elastic part is elastically connected to the porous valve below, so as to keep the valve head in sealed contact with the valve seat when the porous valve is in the initial position.

[0015] Furthermore, the water-swellable portion is located within the inner cavity of the valve head.

[0016] Furthermore, the porous valve also includes a guide rod fixed to the upper part of the valve head;

[0017] The elastic part is sleeved on the outside of the guide rod.

[0018] Furthermore, the guide rod is provided with a shaft cavity that communicates with the inner cavity of the valve head. The axis of the shaft cavity is collinear with the central axis of the guide rod, and an outer ring cavity is provided on the outer periphery of the guide rod. The outer ring cavity is uniformly arranged around the shaft cavity.

[0019] Furthermore, a soluble portion is provided on the outer wall of the valve head;

[0020] When the soluble portion remains undissolved, the outer wall of the porous valve is sealed to the inner wall of the valve cavity;

[0021] After the soluble part dissolves, the outer wall of the porous valve and the inner wall of the valve cavity are in clearance fit. At this time, the valve head can move away from the valve seat along the valve cavity under the action of water pressure.

[0022] Furthermore, a sealing ring is fitted onto the outer periphery of the valve seat.

[0023] Furthermore, the connector assembly includes an upper connector and a lower connector;

[0024] A water injection hole is provided on one side of the upper connector, and a valve chamber is provided inside the upper connector;

[0025] The upper connector and the lower connector are detached and connected. When the upper connector and the lower connector are connected, a radial water inlet cavity is formed on the radial end face of the upper connector and the lower connector.

[0026] The present invention also provides a method for using the above-mentioned intelligent injector, wherein the intelligent injector is inserted into the tubing, and after the packer is set under water injection, the intelligent injector performs water injection construction on the formation under continued water injection.

[0027] After the water injection operation is completed, the intelligent injection device seals the formation and replenishes the formation energy.

[0028] The present invention also provides a water injection oil production tubing string that uses the above-mentioned intelligent injector.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) The intelligent injector of the present invention has a water-swellable part and a soluble part. After being lowered into the oil production tubing, it can form a closed space. After the packer is set with water, the water-swellable part and the soluble part drive the valve head to move and inject water into the formation. After the water injection is completed, the valve head will seal the formation. The water in the formation cannot pass through the one-way valve fixed by the valve head, thereby realizing intelligent water injection and replenishing formation energy.

[0031] (2) When the intelligent water dispenser of the present invention is used, since the intelligent water dispenser and the oil production tubing are of large diameter, the number of layers used by the intelligent water dispenser is not limited by the size of the ball seat and pressure ball of the traditional dispenser.

[0032] (3) The intelligent dispensing device of the present invention has a simple structure, fewer on-site construction procedures, no need for other equipment assistance, is easy for workers to operate, avoids misoperation accidents such as incorrect ball throwing sequence, improves production efficiency, and has great engineering practical value.

[0033] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the steps or apparatus pointed out in the description and the drawings. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A schematic diagram of the existing water injection oil production tubing string is shown;

[0036] Figure 2 A schematic diagram of the overall structure of the intelligent dispensing device in an embodiment of the present invention is shown;

[0037] Figure 3 A schematic diagram of the dispensing unit's main body is shown;

[0038] Figure 4 A schematic diagram of the porous valve structure is shown;

[0039] Figure 5 This diagram shows the structure of the valve head sealing the water injection hole in its initial position.

[0040] Figure 6 A schematic diagram shows the structure where the valve head moves to open the water injection hole after the water-expanding part expands upon contact with water.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Oil pipe; 2. Oil pump; 3. Hanger; 4. Packer; 5. Dispenser; 6. Injector; 7. Guide head; 8. Upper connector; 9. Check valve; 10. Lower connector; 11. Elastic seat; 12. Elastic part; 13. Soluble part; 14. Porous valve; 15. Water-swellable part; 16. Sealing ring; 17. Valve seat; 18. Valve head; 19. Guide rod; 191. Shaft cavity; 192. Outer ring cavity; 20. Radial water inlet cavity; 21. Water injection hole; 22. Valve cavity; 23. Axial cavity. Detailed Implementation

[0043] The technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] Example 1

[0045] This embodiment provides an intelligent dispensing device, including a connector assembly and a dispensing device body. A water injection hole 21 is opened on one side of the connector assembly, and a valve chamber 22 is provided inside the connector assembly. The water injection hole 21 communicates with the middle of the valve chamber 22. The connector assembly also has a radial water inlet chamber 20, and the bottom of the valve chamber 22 communicates with the radial water inlet chamber 20. Figure 2As shown, the connector assembly includes an upper connector 8 and a lower connector 10. A water inlet hole 21 is provided on one side of the upper connector 8, and a valve chamber 22 is provided inside the upper connector 8. The upper connector 8 and the lower connector 10 can be detached and connected, and the detachment and connection can be a standard threaded connection. The upper connector 8 can be connected to the oil pipe 1 via a pipe thread. When the upper connector 8 and the lower connector 10 are connected, a radial water inlet cavity 20 is formed on the radial end faces of the upper connector 8 and the lower connector 10. As an optional embodiment, the upper connector 8 is a hollow stepped shaft shape.

[0046] like Figure 3 As shown, the main body of the injector is located inside the valve cavity 22. The main body of the injector includes a porous valve 14 and a valve seat 17. The porous valve 14 includes a valve head 18 fixed from top to bottom and a one-way valve 9. The valve seat 17 is located at the bottom of the valve cavity 22 and is in sealing contact with the valve cavity 22. The one-way valve 9, the valve seat 17, and the radial water inlet cavity 20 form an axial cavity 23. When the porous valve 14 is in its initial position, the valve head 18 is in sealing contact with the valve seat 17, which blocks the water injection hole 21. The porous valve 14 is provided with a water-expanding part 15. When the water-expanding part 15 is in an expanded state, it can block the axial cavity 23. After the axial cavity 23 is blocked, the valve head 18 can move away from the valve seat 17 along the valve cavity 22 under water pressure. At this time, the water injection hole 21 and the radial water inlet cavity 20 are connected to inject water into the formation.

[0047] The water-swellable part 15 can be made of water-absorbing resin or a composite material containing water-absorbing resin. The water-absorbing resin has high water absorption and excellent water retention properties. The water-absorbing resin in the water-swellable part 15 can absorb water and swell. When it expands to a certain extent, the axial cavity 23 of the water-swellable part 15 is sealed, creating a pressure difference between the two ends of the porous valve 14. This pressure difference then pushes the valve head 18. For a period of time after the intelligent injector is lowered into the tubing, before the water-swellable part 15 seals the axial cavity 23, the valve head 18 seals the injection port 21. As time progresses, the water-swellable part 15 absorbs water and expands, sealing the axial cavity 23. At this point, the water pressure pushes the valve head 18, opening the injection port 21. Water is then injected into the formation through the radial water inlet cavity 20 and the injection port 21.

[0048] After water injection into the formation at the designated location is completed, the injection hole 21 is resealed to allow the valve head 18 to return to its sealed contact position with the valve seat 17. As an optional implementation, such as... Figure 3As shown, the dispensing unit also includes an elastic part 12 and an elastic seat 11. One end of the elastic seat 11 is fixed to the top of the valve chamber 22, and the other end of the elastic seat 11 is elastically connected to the upper part of the elastic part 12. The lower part of the elastic part 12 is elastically connected to a porous valve 14 to maintain the valve head 18 in sealing contact with the valve seat 17 when the porous valve 14 is in its initial position. After water injection is completed, the elastic force of the elastic part 12 pushes the valve head 18 into sealing contact with the valve seat 17. The elastic part 12 can be a compression spring.

[0049] After a water injection is completed, the water pressure in the radial water inlet chamber 20 decreases. When the water pressure drops to the point where it can no longer push the porous valve 14, the valve head 18 is pushed back to the position of sealing contact with the valve seat 17 under the elastic restoring force of the elastic part 12. The valve head 18 then re-seals the water injection chamber, facilitating the next water injection. Because, after the water injection process described above, the water-expanding part 15 seals the axial cavity 23, and the water pressure can overcome the elastic force to push the valve head 18 away from the valve seat 17 again, it can be seen from the above process that the dispenser in this embodiment is not limited by the number of uses or the amount of water injected.

[0050] As an optional implementation, such as Figure 3 As shown, the water-expanding part 15 is located in the inner cavity of the valve head 18; a sealing ring 16 is fitted on the outer periphery of the valve seat 17, and the sealing ring 16 seals the valve seat 17 and the valve cavity 22. The sealing ring 16 can be a rubber ring, and the sealing ring 16 always seals the outer wall of the valve seat 17 and the inner wall of the valve cavity 22 to prevent water from leaking between the valve seat 17 and the valve cavity 22.

[0051] In order for the valve head 18 to move within the valve cavity 22 under water pressure, the valve head 18 cannot be tightly fitted with the inner wall of the valve cavity 22. However, when there is a gap between the valve head 18 and the inner wall of the valve cavity 22, before the water-expanding part 15 seals the axial cavity 23 after a period of time in the well, water in the radial water inlet cavity 20 can enter the inner cavity of the valve head 18. Water can easily flow out from the gap between the valve head 18 and the inner wall of the valve cavity 22, resulting in water leakage. To address this problem, such as... Figure 3 and 4 As shown, a soluble portion 13 is provided on the outer wall of the valve head 18. When the soluble portion 13 is not dissolved, it seals the outer wall of the valve head 18 with the inner wall of the valve cavity 22. After the soluble portion 13 dissolves, the outer wall of the valve head 18 and the inner wall of the valve cavity 22 are in clearance fit. At this time, the valve head 18 can move away from the valve seat 17 along the valve cavity 22 under water pressure. The soluble portion 13 can be a water-soluble compound or composite material, such as a water-soluble resin. During a period of time after entering the well, an environmentally friendly polar solvent can be added to the water to facilitate the dissolution of the soluble portion 13.

[0052] Before dissolving, the soluble part 13 can seal the outer wall of the valve head 18 with the inner wall of the valve cavity 22, preventing water from flowing out from the gap between the valve head 18 and the inner wall of the valve cavity 22 before the water-expanding part 15 seals the axial cavity 23. After the soluble part 13 dissolves, the outer wall of the valve head 18 can no longer seal with the inner wall of the valve cavity 22, allowing the valve head 18 to move within the valve cavity 22 under water pressure.

[0053] like Figure 4 As shown, the porous valve 14 also includes a guide rod 19 fixed to the upper part of the valve head 18. To prevent the water-swellable part 15 from being impacted by water flow and blocking the cavity inside the guide rod 19 before completely sealing the inner cavity of the valve head 18, thus preventing water from entering the cavity inside the guide rod and thus preventing water from contacting the soluble part 13, causing the soluble part 13 to fail to dissolve, a shaft cavity 191 communicating with the inner cavity of the valve head 18 is provided inside the guide rod 19. The axis of the shaft cavity 191 is collinear with the central axis of the guide rod 19, and an outer ring cavity 192 is provided on the outer periphery of the guide rod 19, with the outer ring cavity 192 evenly distributed around the shaft cavity 191. An elastic part 12 is sleeved on the outside of the guide rod 19 and on the outer ring cavity 192. Since multiple outer ring cavities 192 are provided around the shaft cavity 191 of the guide rod 19, and the outer ring cavities 192 are located on the outer periphery of the guide rod 19, the water-swellable part 15 will not block all the cavities inside the guide rod 19 before the water-swellable part 15 seals the inner cavity of the valve head 18, thus preventing water from being unable to contact the soluble part 13 and causing the soluble part 13 to be unable to dissolve.

[0054] The working principle of the intelligent dispensing device in this embodiment is explained in detail below:

[0055] For a period of time after the intelligent injector is inserted into the well tubing, the water-swellable part 15 inside the valve head 18 does not fully expand (the axial cavity 23 is not sealed), and the soluble part 13 does not dissolve (the valve head 18 and the valve cavity 22 still maintain a sealing performance). Figure 5 As shown, during water injection, both sides of valve head 18 are filled with high-pressure fluid. Under the balanced pressure at both ends, valve head 18 remains stationary, and the injection hole 21 does not open. Liquid cannot flow from inside the tubing to the annular region outside the tubing, thus meeting the requirements for setting the packer 4 in the water injection tubing. After continued water injection, as... Figure 6As shown, the water-expanding part 15 inside the valve head 18 expands completely (the axial cavity 23 is not blocked), and the soluble part 13 dissolves completely (the valve head 18 and the valve cavity 22 are no longer in sealed contact). When water is injected, one side of the valve head 18 is filled with high-pressure fluid inside the pipe, and the other side is filled with low-pressure fluid outside the pipe. When the valve head 18 moves, the water injection hole 21 opens, and water can flow from inside the pipe to the annular area outside the pipe. When the water injection ends, the pressure inside the pipe decreases, and the valve head 18 returns to its original position under the action of the elastic part 12 and contacts and seals with the valve seat 17. Liquid cannot flow from outside the pipe to inside the pipe, thus allowing the liquid inside the pipe to flow in one direction.

[0056] Example 2

[0057] A method for using an intelligent injection device involves inserting the intelligent injection device into a tubing, setting the packer 4 under water injection, and then continuing water injection to perform water injection into the formation. After the water injection is completed, the intelligent injection device seals the formation and replenishes its energy. Specifically, the method includes the following steps:

[0058] Step 1: Adopt the existing structure of water injection oil production tubing (such as...) Figure 1 As shown, the downhole tubing and various components are laid out. Components not mentioned are commonly used in the field and are not modified. The difference is that the injector is replaced with the intelligent injector of this invention. The tubing and intelligent injector are of large diameter, and all intelligent injectors have a uniform inner diameter.

[0059] Step 2: Pump water into the tubing string. After the tubing string is filled with water, pressurize it to a certain pressure. The packer 4's sliding sleeve shear pins shorten the rubber sleeve, expanding to complete the setting seal. During this process, water flowing in from the radial water inlet chamber 20 can enter the axial cavity 23. The expansion volume of the water-contaminated expansion section 15 is insufficient to seal the axial cavity 23. The water pressure at both ends of the valve head 18 is the same, and there is a sealed contact between the valve head 18 and the valve seat 17. The water pressure at both ends of the valve head 18 is the same, so water cannot be injected into the formation through the water injection chamber. This achieves layered isolation of the annulus area of ​​the production tubing string 1.

[0060] Step 3: Continue pumping water into the tubing. The water-expanding part 15 expands completely, sealing the axial cavity 23, and the soluble part 13 completely dissolves (losing its sealing performance). The one-way valve 9 allows the fluid to flow in one direction. Under the action of high-pressure water, the valve head 18 moves, exposing the water injection hole 21. The water in the tubing can flow through the one-way valve 9 to the annular area outside the tubing, realizing the water injection construction of the formation.

[0061] Step 4: After the water injection is completed, the valve head 18 is pushed back to the position of sealing contact with the valve seat 17 under the elastic restoring force of the elastic part 12. The valve head 18 re-seals the water injection chamber, and the water outside the tubing cannot enter the tubing through the one-way valve 9, which can effectively replenish the formation energy.

[0062] Step 5: Repeat steps 1-4 above to complete multiple water injections and energy replenishments.

[0063] Example 3

[0064] A water injection oil production tubing string uses the intelligent injector in Example 1. Its usage method can be referred to Example 2, and will not be repeated here.

[0065] In summary, the intelligent injector of this invention has a water-swellable part and a soluble part. After being lowered into the production tubing, it forms a closed space. After water is injected to set the packer, the water-swellable part and the soluble part drive the valve head to move and inject water into the formation. After water injection, the valve head seals the formation, preventing water in the formation from passing through the one-way valve fixed to the valve head, thus achieving intelligent water injection and replenishing formation energy. When using the intelligent injector of this invention, because the intelligent water distributor and the production tubing are of large diameter, the number of layers that can be used by the intelligent injector is not limited by the size of the ball seat and pressure ball of traditional injectors. The intelligent injector of this invention has a simple structure, fewer on-site construction procedures, requires no other equipment assistance, is easy for workers to operate, avoids operational accidents such as incorrect ball-throwing sequence, improves production efficiency, and has great engineering practical value.

[0066] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An intelligent dispensing device, characterized in that, Includes connector assembly and dispenser body; A water injection hole (21) is provided on one side of the connector assembly, and a valve chamber (22) is provided inside the connector assembly. The water injection hole (21) communicates with the middle part of the valve chamber (22). The connector assembly also has a radial water inlet chamber (20), and the bottom of the valve chamber (22) communicates with the radial water inlet chamber (20). The dispensing device body is disposed in the valve cavity (22). The dispensing device body includes a porous valve (14) and a valve seat (17). The porous valve (14) includes a valve head (18) fixed from top to bottom and a one-way valve (9). The valve seat (17) is located at the bottom of the valve cavity (22) and is in sealing contact with the valve cavity (22). The one-way valve (9), the valve seat (17) and the radial water inlet cavity (20) form an axial cavity (23). When the porous valve (14) is in its initial position, the valve head (18) and the valve seat (17) are in a sealing contact, causing the valve head (18) to block the water inlet (21). The porous valve (14) is provided with a water-expanding part (15) inside. The water-expanding part (15) can seal the axial cavity (23) when it is in an expanded state. After the axial cavity (23) is sealed, the valve head (18) can move away from the valve seat (17) along the valve cavity (22) under the action of water pressure. The outer wall of the valve head (18) is provided with a soluble part (13); When the soluble part (13) is not dissolved, it seals the outer wall of the valve head (18) with the inner wall of the valve cavity (22); After the soluble part (13) dissolves, the outer wall of the valve head (18) and the inner wall of the valve cavity (22) are in clearance fit. At this time, the valve head (18) can move away from the valve seat (17) along the valve cavity (22) under the action of water pressure.

2. The intelligent dispensing device according to claim 1, characterized in that, The dispensing device body also includes an elastic part (12) and an elastic seat (11). One end of the elastic seat (11) is fixed to the top of the valve cavity (22), and the other end of the elastic seat (11) is elastically connected to the upper part of the elastic part (12); The elastic part (12) is elastically connected to the porous valve (14) below, so as to keep the valve head (18) and the valve seat (17) in sealed contact when the porous valve (14) is in the initial position.

3. The intelligent dispensing device according to claim 1, characterized in that, The water-swellable part (15) is located in the inner cavity of the valve head (18).

4. The intelligent dispensing device according to claim 2, characterized in that, The porous valve (14) also includes a guide rod (19) fixed to the upper part of the valve head (18). The elastic part (12) is sleeved on the outside of the guide rod (19).

5. The intelligent dispensing device according to claim 4, characterized in that, The guide rod (19) is provided with a shaft cavity (191) that communicates with the inner cavity of the valve head (18). The axis of the shaft cavity (191) is collinear with the central axis of the guide rod (19). An outer ring cavity (192) is provided on the outer periphery of the guide rod (19). The outer ring cavity (192) is uniformly arranged around the shaft cavity (191).

6. The intelligent dispensing device according to claim 1, characterized in that, A sealing ring (16) is fitted on the outer periphery of the valve seat (17).

7. The intelligent dispensing device according to any one of claims 1-6, characterized in that, The connector assembly includes an upper connector (8) and a lower connector (10). A water injection hole (21) is provided on one side of the upper connector (8), and a valve chamber (22) is provided inside the upper connector (8). The upper connector (8) and the lower connector (10) are detached and connected. When the upper connector (8) and the lower connector (10) are connected, a radial water inlet cavity (20) is formed on the radial end face of the upper connector (8) and the lower connector (10).

8. A method of using the intelligent dispensing device according to any one of claims 1-6, characterized in that, The intelligent injector is inserted into the tubing. After the packer (4) is set under water injection, the intelligent injector can carry out water injection construction on the formation under continued water injection. After the water injection operation is completed, the intelligent injection device seals the formation and replenishes the formation energy.

9. A water injection oil production tubing string, characterized in that, Use the smart dispensing device according to any one of claims 1-6.

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