Hydraulic control irreversible constant-pressure opening water injection valve for concentric double-pipe layered water injection tubular column

Abstract

The utility model discloses a hydraulic control irreversible constant pressure opening water injection valve for a concentric double-pipe layered water injection string, which comprises a hydraulic control pipe section and a water injection pipe section which are sequentially connected from top to bottom, a piston capable of sliding up and down is arranged in the hydraulic control pipe section and the water injection pipe section, and the hydraulic control pipe section is connected with the piston through a breakable mechanism and a one-way non-retreating mechanism; the water injection pipe joint is provided with an outer water outlet hole channel, the piston is provided with an inner water outlet hole channel, and the inner water outlet hole channel can be communicated with the outer water outlet hole channel after the piston moves. According to the utility model, the action of opening the water injection valve and an underground tool under the water injection valve can be realized through hydraulic control irreversible constant pressure by pressing the ground through a hydraulic pipeline.

Description

Technical Field

[0001] This utility model relates to the field of petroleum development technology, specifically to a hydraulically controlled irreversible constant pressure opening water injection valve for a concentric double-pipe stratified water injection string. Background Technology

[0002] Shengli offshore oilfield ranks among the top producers in the Shengli oilfield sector, and water-drive development is its primary development method. The offshore oilfield is currently in the medium-to-high water-cut development stage. With the continuous increase in water cut, inter-layer conflicts and interference are becoming more prominent. In accordance with the offshore reservoir subdivision water injection policy, further subdivision of water injection is urgently needed to increase the degree of water-drive utilization. In concentric dual-pipe stratified water injection, stratification requires the use of sealing plugs. On-site, it is often impossible to determine whether the sealing plug has been lowered to the designated position to achieve an interference fit with the working barrel, thus meeting the stratification requirements. Therefore, water injection valves that allow for pressure-locking operations, such as those controlled by hydraulic lines, are required.

[0003] Publication No. CN115853480A discloses a well-to-well injection / extraction device and flow control method, including: an oil layer casing, a production tubing, an electric submersible pump, a diversion-type insertion seal, an inner tubing, and an outer tubing. The outer tubing is equipped with a flow control device at each water injection layer. The flow control device includes: a tubing string with an injection port on its wall; a drive device fixed to the inner circumferential surface of the tubing string; and a switch sleeve located on the inner circumferential surface of the tubing string, connected to the drive device, and having an overflow orifice. The drive device drives the switch sleeve to move axially along the tubing string to control the formation of a communication port between the overflow orifice and the injection port and to adjust the size of the communication port.

[0004] The existing technology requires flow rate adjustment and pressurization to keep the water injection hole open, resulting in high energy consumption.

[0005] Announcement No. CN115478810B discloses a magnetic medium-based induction sliding sleeve and a downhole tool control method. The sliding sleeve includes: a sliding sleeve body, a piston, a sensing unit, a control unit, and an execution unit. The sliding sleeve body has a first central cavity, a connecting hole, and a first flow hole, with the first flow hole located at the lower end of the sliding sleeve body. The piston is located in the first central cavity. The piston has a second central cavity, which is connected to the first central cavity. The piston has a second flow hole, which corresponds to the first flow hole. When the sliding sleeve is closed, the first and second flow holes are not connected. The sensing unit can generate a voltage when a specific fluid flows through the first central cavity. The control unit can collect the voltage and issue a control signal when preset conditions are met. The execution unit can receive the control signal to drive the piston to open.

[0006] The existing technology uses heated hydraulic oil to push the sliding sleeve and open the water outlet. This method requires continuous heating to maintain its operation, which results in high energy consumption.

[0007] Announcement No. CN219327530U discloses a hydraulically controlled layer-changing switch and a multi-layer linkage stratified oil production tubing string, including an upper connector, an inner sleeve, a sealing sleeve, a first connecting sleeve, a track sleeve, a second connecting sleeve, a limiting sleeve, and a lower connector. The upper connector and the lower connector are connected sequentially by the inner sleeve and the track sleeve. The upper part of the track sleeve is located in the annular cavity between the upper connector and the inner sleeve. The outer side of the track sleeve is sequentially provided with the sealing sleeve, the first connecting sleeve, the second connecting sleeve, and the limiting sleeve. The sealing sleeve is connected to the upper connector. A spring is provided between the lower connector and the track sleeve. The upper outer side of the upper connector is provided with a hydraulically controlled pipeline inlet. The outer side of the track sleeve is provided with a track groove. A limiting pin is installed on the limiting sleeve and is located in the track groove. The track sleeve is provided with a liquid inlet corresponding to the first connecting sleeve. The multi-layer linkage stratified oil production tubing string includes the above-mentioned hydraulically controlled layer-changing switch, as well as tubing, an electric pump, and a layer-crossing packer.

[0008] The existing technology can keep the water outlet open, but repressurization will cause the track to move, making it impossible to control the existing technology and other downhole tools with a single hydraulic control line.

[0009] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0010] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model provides a hydraulically controlled irreversible constant pressure opening water injection valve for a concentric double-pipe layered water injection column.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A hydraulically controlled irreversible constant pressure opening water injection valve for a concentric double-pipe layered water injection column includes a hydraulically controlled pipe section and a water injection pipe section connected sequentially from top to bottom. A piston that can slide up and down is installed inside the hydraulically controlled pipe section and the water injection pipe section. The hydraulically controlled pipe section is connected to the piston through a disconnectable mechanism and a one-way non-retractable mechanism. The water injection pipe section is provided with an outlet water channel, and the piston is provided with an inner outlet water channel. After the piston moves, the inner outlet water channel can communicate with the outlet water channel.

[0013] Furthermore, the hydraulic control pipe section includes an upper pressure transmission pipe section and a lower pressure transmission pipe section. The lower end of the upper pressure transmission pipe section is connected to the upper end of the lower pressure transmission pipe section. The upper pressure transmission pipe section is provided with an upper inner convex ring, and the lower pressure transmission pipe section is provided with a lower inner convex ring.

[0014] Specifically, the lower end of the upper inner convex ring is provided with an axial piston track ring groove, and the upper pressure pipe section is provided with an upper pressure channel to connect the piston track ring groove with the outside;

[0015] Specifically, the piston includes a large-diameter pipe section and a small-diameter pipe section. The upper end of the large-diameter pipe section of the piston is slidably inserted into the piston track ring groove, and the outer wall of the small-diameter pipe section of the piston is in sealing contact with the inner wall of the lower inner convex ring.

[0016] Specifically, the space between the upper inner convex ring, the lower inner convex ring, and the small-diameter pipe section is the piston movement space, and the lower pressure transmission pipe section is provided with a lower pressure transmission channel that communicates with the piston movement space;

[0017] Specifically, a one-way non-retractable mechanism and a breakable mechanism are provided between the upper pressure transmission pipe section and the lower pressure transmission pipe section, and the one-way non-retractable mechanism and the breakable mechanism are connected to the outer wall of the large-diameter pipe section.

[0018] Furthermore, the one-way non-retractable mechanism includes a one-way locking ring, which is sandwiched between the upper pressure transmission pipe section and the lower pressure transmission pipe section. A one-way buckle is provided on the outer wall of the large-diameter pipe section of the piston, and the one-way locking ring cooperates with the one-way buckle.

[0019] Specifically, the breakable mechanism includes an actuating shear pin, and the piston is connected to a hydraulic control section or a one-way locking ring via the actuating shear pin.

[0020] Furthermore, the upper pressure pipe section includes an upper connector, a first connecting sleeve, and a second connecting sleeve;

[0021] Specifically, the lower inner wall of the upper connector is connected to the upper outer wall of the first connecting sleeve and is positioned by the step of the upper connector; the inner wall of the first connecting sleeve is provided with an upper inner protruding ring.

[0022] Specifically, the pressure transmission channel includes an upper hydraulic control pipeline connector and an inner pressure transmission channel. The upper hydraulic control pipeline connector is located at the step of the upper connector, and the inner pressure transmission channel connects the piston track ring groove with the upper end face of the upper inner convex ring.

[0023] Specifically, the lower outer wall of the first connecting sleeve is connected to the second connecting sleeve;

[0024] Specifically, the one-way locking ring is located below the upper inner convex ring, on the side close to the second connecting sleeve.

[0025] Furthermore, the lower pressure transmission pipe section includes a locking ring fixing rod, a third connecting sleeve, and a fourth connecting sleeve;

[0026] Specifically, the lower outer wall of the locking ring fixing rod is connected to the inner wall of the third connecting sleeve, the inner wall of the third connecting sleeve is provided with a lower inner convex ring, the lower pressure transmission channel is provided in the lower inner convex ring, and the lower end of the lower pressure transmission channel is a lower liquid control pipeline connector;

[0027] Specifically, the upper outer wall of the fourth connecting sleeve is connected to the inner wall of the lower inner convex ring, the upper outer wall of the locking ring fixing rod is connected to the inner wall of the second connecting sleeve, the upper end face of the locking ring fixing rod is in contact with the lower end of the one-way locking ring, and the inner wall of the fourth connecting sleeve is in sealing contact with the outer wall of the piston.

[0028] Furthermore, the starting shear pin is located between the one-way locking ring and the locking ring fixing rod.

[0029] Furthermore, the water injection pipe section includes a fifth connecting sleeve, the water outlet channel is disposed in the fifth connecting sleeve, the upper inner wall of the fifth connecting sleeve is connected to the lower outer wall of the fourth connecting sleeve, the inner wall of the fifth connecting sleeve is in contact with and sealed to the outer wall of the piston, and the lower end of the fifth connecting sleeve is connected to the lower connector.

[0030] Furthermore, the step of the upper connector and the first connecting sleeve is sealed at the position between the pressure transmission channel and the internal central channel;

[0031] Specifically, the inner wall of the piston is sealed to the inner wall of the piston track annular groove, and a pressure transmission gap is left between the outer wall of the piston and the outer wall of the piston track annular groove.

[0032] Specifically, the first connecting sleeve and the upper connector step are sealed at the position between the pressure transmission channel and the outside, and the first connecting sleeve and the second connecting sleeve are sealed together;

[0033] Specifically, the locking ring fixing rod is sealed to the second connecting sleeve; the locking ring fixing rod is sealed to the third connecting sleeve; the third connecting sleeve is sealed to the fourth connecting sleeve; and the fourth connecting sleeve is sealed to the piston.

[0034] Specifically, the fifth connecting sleeve is sealed to the fourth connecting sleeve, the fifth connecting sleeve is sealed to the piston above and below the outlet water channel, and the fifth connecting sleeve is sealed to the lower connector.

[0035] Furthermore, the outgoing water channel is a first array of holes, and the internal water outlet channel is a second array of holes.

[0036] Furthermore, the water injection pipe section or piston is provided with a buffer groove between the outgoing water channel and the inner water channel, and the buffer groove can cover the outgoing water channel and the inner water channel.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] 1. This utility model enables the hydraulically controlled irreversible constant pressure opening of the water injection valve and the downhole tools below by pressurizing the ground through a hydraulic pipeline; before formal water injection, the state of the sealing plug can be judged by the pressure holding operation, reducing operating costs; it achieves reliable and stable injection of water and improves the service life of the water injection string.

[0039] 2. The internal water outlet channel, buffer tank, and external water outlet channel of this utility model can reliably and stably inject water. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of a hydraulically controlled irreversible constant pressure opening water injection valve for a concentric double-pipe layered water injection column according to this utility model.

[0041] Figure 2 This is a schematic diagram of the upper connector in this utility model.

[0042] Figure 3 This is a schematic diagram of the structure of the first connecting sleeve in this utility model.

[0043] Figure 4 This is a schematic diagram of the piston structure in this utility model.

[0044] Figure 5 This is a schematic diagram of the structure of the third connecting sleeve in this utility model.

[0045] Figure 6 This is a schematic diagram of the structure of the fifth connecting sleeve in this utility model.

[0046] In the diagram: 1. Coupling; 2. Upper connector; 201. Upper liquid control pipeline connector; 3. First retaining ring; 4. First sealing ring; 5. First connecting sleeve; 5. Inner pressure transmission channel; 501. Piston track ring groove; 502. Upper inner convex ring; 503. Piston; 6. Inner water outlet channel; 601. Large diameter pipe section; 602. Small diameter pipe section; 603. Second retaining ring; 7. Second sealing ring; 8. Third retaining ring; 9. Third sealing ring; 10. Second connecting sleeve; 11. One-way locking ring; 12. Starting shear pin; 13. Locking ring fixing rod; 14. Third connecting sleeve; 15. Lower pressure transmission channel; 1501. Lower inner convex ring; 1502. Fifth retaining ring; 16. Fifth sealing ring; 17. Fourth connecting sleeve; 18. Sixth retaining ring; 19. Sixth sealing ring; 20. Fifth connecting sleeve; 21. Outer water outlet channel; 2101. Buffer groove; 2102. Combined seal; 22. Lower connector; 23. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0048] Example 1:

[0049] Please see Figures 1 to 6 This utility model provides a hydraulically controlled irreversible constant pressure opening water injection valve for a concentric double-pipe layered water injection column, comprising a hydraulically controlled pipe section and a water injection pipe section connected sequentially from top to bottom. A piston 6 capable of sliding up and down is installed inside the hydraulically controlled pipe section and the water injection pipe section. The hydraulically controlled pipe section is connected to the piston 6 via a disconnectable mechanism and a one-way non-retractable mechanism. The water injection pipe section has an outlet water channel 2101, and the piston 6 has an inner outlet water channel 601. After the piston 6 moves, the inner outlet water channel 601 can communicate with the outlet water channel 2101. By applying pressure to the ground, the multi-functional piston 6 can be pushed downwards, so that the channel 601 on the multi-functional piston 6 corresponds to the channel 2101 on the fifth connecting sleeve, thus completing the water injection.

[0050] Further, the hydraulic control pipe section includes an upper pressure transmission pipe section and a lower pressure transmission pipe section. The lower end of the upper pressure transmission pipe section is connected to the upper end of the lower pressure transmission pipe section. The upper pressure transmission pipe section is provided with an upper inner convex ring 503, and the lower pressure transmission pipe section is provided with a lower inner convex ring 1502. The lower end of the upper inner convex ring 503 is provided with an axial piston track ring groove 502. The upper pressure transmission pipe section is provided with an upper pressure transmission channel to connect the piston track ring groove 502 with the outside. The piston 6 includes a large-diameter pipe section 602 and a small-diameter pipe section 603. The large-diameter pipe section of the piston 6... The upper end is slidably inserted into the piston track ring groove 502. The outer wall of the small-diameter pipe section of the piston 6 is in sealed contact with the inner wall of the lower inner convex ring 1502. The space between the upper inner convex ring 503, the lower inner convex ring 1502, and the small-diameter pipe section 603 is the piston movement space. The lower pressure transmission pipe section is provided with a lower pressure transmission channel 1501 that communicates with the piston movement space. A one-way non-retractable mechanism and a breakable mechanism are provided between the upper pressure transmission pipe section and the lower pressure transmission pipe section. The one-way non-retractable mechanism and the breakable mechanism are connected to the outer wall of the large-diameter pipe section 602.

[0051] Furthermore, the one-way non-retractable mechanism includes a one-way locking ring 12, which is sandwiched between the upper pressure transmission pipe section and the lower pressure transmission pipe section. The outer wall of the large-diameter pipe section 602 of the piston 6 is provided with a one-way buckle. The one-way locking ring 12 cooperates with the one-way buckle. The breakable mechanism includes a starting shear pin 13. The piston 6 is connected to the hydraulic control pipe section or the one-way locking ring 12 through the starting shear pin 13. When starting, the piston 6 is pressed to shear the starting shear pin 13. The piston 6 moves downward to connect the inner water outlet channel 601 and the outer water outlet channel 2101. The large-diameter pipe section 602 is locked with the one-way locking ring 12 to prevent retraction, thereby realizing the hydraulic control irreversible constant pressure opening.

[0052] Specifically, the one-way locking ring is a segmented ring with a grooved inner wall, and the one-way buckle is a toothed buckle.

[0053] Further, the pressure transmission pipe section includes an upper connector 2, a first connecting sleeve 5, and a second connecting sleeve 11. The lower inner wall of the upper connector 2 is threadedly connected to the upper outer wall of the first connecting sleeve 5 and positioned by a step of the upper connector 2. An upper inner convex ring 503 is provided on the inner wall of the first connecting sleeve 5. The pressure transmission channel includes an upper hydraulic control line connector 201 and an inner pressure transmission channel 501. The upper hydraulic control line connector 201 is located at the step of the upper connector 2. The inner pressure transmission channel 501 connects the piston track ring groove 502 to the upper end face of the upper inner convex ring 503. The lower outer wall of the first connecting sleeve 5 is threadedly connected to the second connecting sleeve 11. The one-way locking ring 12 is located below the upper inner convex ring 503 and on the side close to the second connecting sleeve 11. The upper end of the upper connector 2 is threadedly connected to a coupling 1, and the upper side of the coupling 1 has an oil pipe thread.

[0054] Furthermore, the lower pressure transmission tube section includes a locking ring fixing rod 14, a third connecting sleeve 15, and a fourth connecting sleeve 18. The lower outer wall of the locking ring fixing rod 14 is connected to the inner wall of the third connecting sleeve 15. The inner wall of the third connecting sleeve 15 is provided with a lower inner convex ring 1502. The lower pressure transmission channel 1501 is provided in the lower inner convex ring 1502. The lower end of the lower pressure transmission channel 1501 is a lower liquid control pipeline connector. The upper outer wall of the fourth connecting sleeve 18 is threadedly connected to the inner wall of the lower inner convex ring 1502. The upper outer wall of the locking ring fixing rod 14 is threadedly connected to the inner wall of the second connecting sleeve 11. The upper end face of the locking ring fixing rod 14 contacts the lower end of the one-way locking ring 12 to position the one-way locking ring 12. The inner wall of the fourth connecting sleeve 18 is in sealing contact with the outer wall of the piston 6.

[0055] The lower hydraulic control line connector is used to connect the lower hydraulic line and transmit pressure to the downhole tools below.

[0056] Specifically, the starting shear pin 13 is located between the one-way locking ring 12 and the locking ring fixing rod 14.

[0057] Furthermore, the water injection pipe section includes a fifth connecting sleeve 21, the water outlet channel 2101 is disposed in the fifth connecting sleeve 21, the upper inner wall of the fifth connecting sleeve 21 is threadedly connected to the lower outer wall of the fourth connecting sleeve 18, the inner wall of the fifth connecting sleeve 21 is in contact with and sealed to the outer wall of the piston 6, the lower end of the fifth connecting sleeve 21 is threadedly connected to the lower connector 23, and the lower outer side of the lower connector 23 has an oil pipe thread.

[0058] In this embodiment, the sealing mechanism is as follows: the step of the upper connector 2 and the first connecting sleeve 5 is sealed between the pressure transmission channel and the internal central channel by the first retaining ring 3 and the first sealing ring 4; the inner wall of the piston 6 is sealed with the inner wall of the piston track ring groove 502 by the second retaining ring 7 and the second sealing ring 8, and a pressure transmission gap is left between the outer wall of the piston 6 and the outer wall of the piston track ring groove 502; the step of the first connecting sleeve 5 and the upper connector 2 is sealed between the pressure transmission channel and the outside by the third retaining ring 9 and the third sealing ring 10, and the first connecting sleeve 5 and the second connecting sleeve 11 are sealed by the third retaining ring 9 and the third sealing ring 10; the locking ring fixing rod 14 and the second connecting sleeve 11 are sealed by the fourth... The locking ring fixing rod 14 and the third connecting sleeve 15 are sealed by the fourth retaining ring and the fourth sealing ring; the third connecting sleeve 15 and the fourth connecting sleeve 18 are sealed by the fifth retaining ring 16 and the fifth sealing ring 17; the fourth connecting sleeve 18 and the piston 6 are sealed by the sixth retaining ring 19 and the sixth sealing ring 20; the fifth connecting sleeve 21 and the fourth connecting sleeve 18 are sealed by the seventh retaining ring and the seventh sealing ring; the fifth connecting sleeve 21 is provided with a combined seal 22 above and below the outlet water channel 2101; the combined seal 22 and the piston 6 are reliably sealed; the fifth connecting sleeve 21 and the lower connector 23 are sealed by the eighth retaining ring and the eighth sealing ring.

[0059] Specifically, the first connecting sleeve 5 and the second connecting sleeve 11 can be welded together or manufactured as a single piece.

[0060] In use, the hydraulically controlled irreversible constant pressure opening water injection valve is used for concentric double-pipe stratified water injection. It needs to be used in conjunction with a sealing plug and a packer to achieve the stratification function. Before formal water injection, pressurize the annular space between the central pipe and the hydraulically controlled irreversible constant pressure opening water injection valve. If there is pressure buildup, it indicates that the sealing plug is reliable and formal water injection can begin.

[0061] During water injection, the surface pressurizes the upper hydraulic control line. The pressure is transmitted from the upper hydraulic control line joint 201 and the inner pressure transmission channel 501 to the piston track annular groove 502. A portion of the hydraulic oil acts on the multi-functional piston 6. When the starting pressure is reached, the starting shear pin 13 is sheared, pushing the multi-functional piston 6 to move, so that the inner water outlet channel 601 on the multi-functional piston 6 corresponds to the outer water outlet channel 2101 on the fifth connecting sleeve 21, realizing water injection into the outer pipe. After that, the hydraulic control line is depressurized, and the position of the multi-functional piston 6 is self-locked by the one-way locking ring 12. Another portion of the hydraulic oil in the upper hydraulic control line flows out along the gap between the outer wall of the multi-functional piston 6 and the piston track annular groove 502, the annular space between the locking ring fixing rod 14 and the piston 6, and the lower pressure transmission channel 1501 to the lower hydraulic control line, and enters the next stage downhole tool.

[0062] Example 2:

[0063] Based on Example 1, in this example, the outgoing water channel 2101 is a first array of holes, and the inner water channel 601 is a second array of holes, thereby reducing the impact of the water outlet on the strength of the pipe section.

[0064] The water injection pipe section or piston 6 has a buffer groove 2102 between the outgoing water channel 2101 and the inner water outlet channel 601. The buffer groove 2102 can cover the first array of holes and the second array of holes, so that after the liquid passes through the inner water outlet channel 601, the buffer groove 2102 redistributes the water flow to a certain extent, reducing the impact of the flow force and making the water output from the outgoing water channel 2101 uniform. Furthermore, by setting the buffer groove 2102, the alignment accuracy requirement is reduced, and stable and reliable water injection can be guaranteed even with certain processing and installation errors. Specifically, the buffer groove 2102 is a trapezoidal groove.

[0065] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0066] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0067] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0068] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A hydraulically controlled irreversible constant-pressure opening water injection valve for a concentric double-tube layered water injection string, comprising a hydraulically controlled pipe section and a water injection pipe section connected sequentially from top to bottom, wherein a piston capable of sliding up and down is installed inside the hydraulically controlled pipe section and the water injection pipe section, characterized in that, The hydraulic control section is connected to the piston via a disconnectable mechanism and a one-way non-retractable mechanism; The water injection pipe section is provided with an external water outlet channel, and the piston is provided with an internal water outlet channel. After the piston moves, the internal water outlet channel can communicate with the external water outlet channel.

2. The hydraulically controlled irreversible constant pressure opening water injection valve for a concentric double-pipe stratified water injection string according to claim 1, characterized in that, The hydraulic control pipe section includes an upper pressure transmission pipe section and a lower pressure transmission pipe section. The lower end of the upper pressure transmission pipe section is connected to the upper end of the lower pressure transmission pipe section. The upper pressure transmission pipe section is provided with an upper inner convex ring, and the lower pressure transmission pipe section is provided with a lower inner convex ring. The lower end of the upper inner convex ring is provided with an axial piston track ring groove, and the upper pressure tube section is provided with an upper pressure channel to connect the piston track ring groove with the outside. The piston includes a large-diameter tube section and a small-diameter tube section. The upper end of the large-diameter tube section of the piston is slidably inserted into the piston track ring groove, and the outer wall of the small-diameter tube section of the piston is in sealing contact with the inner wall of the lower inner convex ring. The space between the upper inner convex ring, the lower inner convex ring, and the small-diameter pipe section is the piston movement space, and the lower pressure transmission pipe section is provided with a lower pressure transmission channel that communicates with the piston movement space. A one-way non-retractable mechanism and a breakable mechanism are provided between the upper pressure pipe section and the lower pressure pipe section. The one-way non-retractable mechanism and the breakable mechanism are connected to the outer wall of the large-diameter pipe section.

3. The hydraulically controlled irreversible constant pressure opening water injection valve for a concentric double-pipe stratified water injection string according to claim 2, characterized in that, The one-way non-retractable mechanism includes a one-way locking ring, which is sandwiched between the upper pressure transmission pipe section and the lower pressure transmission pipe section. The outer wall of the large-diameter pipe section of the piston is provided with a one-way buckle, and the one-way locking ring cooperates with the one-way buckle. The breakable mechanism includes an actuating shear pin, and the piston is connected to a hydraulic control section or a one-way locking ring via the actuating shear pin.

4. The hydraulically controlled irreversible constant pressure opening water injection valve for a concentric double-pipe stratified water injection string according to claim 3, characterized in that, The upper pressure pipe section includes an upper connector, a first connecting sleeve, and a second connecting sleeve; The lower inner wall of the upper connector is connected to the upper outer wall of the first connecting sleeve and is positioned by the step of the upper connector. The inner wall of the first connecting sleeve is provided with an upper inner protruding ring. The pressure transmission channel includes an upper hydraulic control pipeline connector and an inner pressure transmission channel. The upper hydraulic control pipeline connector is located at the step of the upper connector, and the inner pressure transmission channel connects the piston track ring groove with the upper end face of the upper inner convex ring. The lower outer wall of the first connecting sleeve is connected to the second connecting sleeve; The one-way locking ring is located below the upper inner convex ring, on the side close to the second connecting sleeve.

5. The hydraulically controlled irreversible constant pressure opening water injection valve for a concentric double-pipe stratified water injection string according to claim 4, characterized in that, The lower pressure transmission pipe section includes a locking ring fixing rod, a third connecting sleeve, and a fourth connecting sleeve; The lower outer wall of the locking ring fixing rod is connected to the inner wall of the third connecting sleeve. The inner wall of the third connecting sleeve is provided with a lower inner convex ring. The lower pressure transmission channel is provided in the lower inner convex ring. The lower end of the lower pressure transmission channel is a lower liquid control pipeline connector. The upper outer wall of the fourth connecting sleeve is connected to the inner wall of the lower inner convex ring, the upper outer wall of the locking ring fixing rod is connected to the inner wall of the second connecting sleeve, the upper end face of the locking ring fixing rod is in contact with the lower end of the one-way locking ring, and the inner wall of the fourth connecting sleeve is in sealing contact with the outer wall of the piston.

6. The hydraulically controlled irreversible constant pressure opening water injection valve for a concentric double-pipe stratified water injection string according to claim 5, characterized in that, The starting shear pin is located between the one-way locking ring and the locking ring fixing rod.

7. The hydraulically controlled irreversible constant pressure opening water injection valve for a concentric double-pipe stratified water injection string according to claim 5, characterized in that, The water injection pipe section includes a fifth connecting sleeve, the water outlet channel is provided in the fifth connecting sleeve, the upper inner wall of the fifth connecting sleeve is connected to the lower outer wall of the fourth connecting sleeve, the inner wall of the fifth connecting sleeve is in contact with and sealed to the outer wall of the piston, and the lower end of the fifth connecting sleeve is connected to the lower connector.

8. The hydraulically controlled irreversible constant pressure opening water injection valve for a concentric double-pipe stratified water injection string according to claim 7, characterized in that, The upper connector and the step of the first connecting sleeve are sealed at the position between the pressure transmission channel and the internal central channel; The inner wall of the piston is sealed to the inner wall of the piston track annular groove, and a pressure transmission gap is left between the outer wall of the piston and the outer wall of the piston track annular groove. The first connecting sleeve and the upper connector step are sealed at the position between the pressure channel and the outside, and the first connecting sleeve and the second connecting sleeve are sealed together. The locking ring fixing rod is sealed to the second connecting sleeve; the locking ring fixing rod is sealed to the third connecting sleeve; the third connecting sleeve is sealed to the fourth connecting sleeve; and the fourth connecting sleeve is sealed to the piston. The fifth connecting sleeve is sealed to the fourth connecting sleeve, the fifth connecting sleeve is sealed to the piston above and below the outlet water channel, and the fifth connecting sleeve is sealed to the lower connector.

9. A hydraulically controlled irreversible constant pressure opening water injection valve for a concentric double-pipe stratified water injection string according to claim 1, characterized in that, The outgoing water channel is a first array of holes, and the internal water outlet channel is a second array of holes.

10. A hydraulically controlled irreversible constant pressure opening water injection valve for a concentric double-pipe stratified water injection string according to claim 1 or 9, characterized in that, The water injection pipe section or piston is provided with a buffer groove between the outgoing water channel and the inner water channel, and the buffer groove can cover the outgoing water channel and the inner water channel.

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