A telescopic compensation type layered water injection sealing device

Abstract

This utility model discloses a telescopic compensation type layered water injection sealing device, which includes a rubber sleeve and a spring. The upper and lower rubber sleeves, installed outside the upper and lower water injection pipes respectively, have hydraulic chambers one and two connected by a connecting hose. A pressure transmission hole in the upper water injection pipe, connected to hydraulic chamber one, is connected to a hydraulic pump on the ground via a hydraulic pipeline. The upper and lower water injection pipes are connected by a telescopic compensation mechanism. The spring is installed between the sealing cylinder and the telescopic sleeve in the telescopic compensation mechanism. The upper water injection pipe, sealing cylinder, corrugated pipe, sealing sleeve, and a fixing ring installed outside the lower water injection pipe and below the telescopic sleeve are sequentially fixedly connected. The lower water injection pipe can move up and down within the telescopic sleeve and the fixing ring. The telescopic compensation mechanism absorbs vibration energy generated during water injection and compensates for sealing gaps. This device is suitable for high-efficiency layered water injection tubing in oilfield development, providing vibration and creep prevention effects.

Description

Technical Field

[0001] This utility model relates to a stratified water injection packer for oil extraction, and more particularly to a telescopic compensation type stratified water injection packer device. Background Technology

[0002] In oilfield development, in order to achieve efficient replenishment of reservoir energy, implementing efficient stratified water injection is the key to maintaining formation pressure and improving recovery rate.

[0003] To achieve precise stratified water injection, the water injection packer needs to be delivered to the required sealing position downhole through the water injection string. By applying pressure to the rubber sleeve installed outside the packer, the rubber sleeve expands and seals the annular space of the oil casing, thereby sealing and isolating the water injection layers and achieving stratified water injection.

[0004] In traditional stratified water injection technology, the high-pressure pulsations and fluid disturbances during the injection process often cause vibration or vertical movement of the injection tubing within the wellbore. This leads to loosening or failure of the stratified packers, resulting in water cross-contamination and other problems, severely impacting injection efficiency and the production of the corresponding oil wells. Furthermore, the unstable single-point support structure of the packers and insufficient wall adhesion, coupled with rigid connections in their structure, result in high vibration transmission efficiency, easily causing resonance in the injection tubing and even accidents such as tubing breakage or fracture.

[0005] To address the aforementioned issues, the following related patent technology has emerged: Patent application number CN202411926744.6 discloses a vibration reduction and anti-loosening device for a downhole layered water injection packer string. This device includes an expansion assembly comprising an expansion sleeve connected between two sets of flexible tubes. The ends of the two flexible tubes furthest from the expansion sleeve are respectively connected to the water injection packer string and the water injection pipe. The expansion sleeve has a radially penetrating guide hole, at which an expansion assembly is installed. An expansion block is provided around the periphery of the expansion sleeve, with its inner side connected to the expansion assembly. A surrounding tension spring is also provided around the periphery of the expansion sleeve, wrapped around the outer side of the expansion block. The flexible tubes effectively block vibrations transmitted from the upper water injection pipe, and the expansion assembly secures the other end of the flexible tubes, significantly reducing vibrations experienced by the downhole layered water injection packer string. This ensures the stability and sealing of the downhole layered water injection packer string, allowing for normal layered water injection and thus improving the water injection response rate.

[0006] The aforementioned invention mainly relates to an efficient layered water injection packer for preventing creep in water injection wells during oilfield development. It employs an expansion sleeve and flexible tubing connection, with a tightening block and a surrounding tension spring on the periphery of the expansion sleeve to block and buffer the vertical creep of the water injection tubing, ensuring the stability of the layered seal. However, the device uses a single-sleeve expansion sleeve, which itself undergoes compression deformation under downhole high-pressure conditions; the rigid connection with the flexible tubing and the inner lining of the tightening block affects the vibration buffering effect; and the device lacks a compensation mechanism when the pressure fluctuates in the water injection zone, failing to actively absorb the stress from the vertical movement of the tubing, thus affecting the long-term sealing effectiveness of the packer.

[0007] Patent application CN202021609870.6 discloses a layered water injection device, relating to the field of layered water injection technology. It includes a protective block, a composite water injection pipe, a hydraulic anchor, a packer, and a water distributor. The protective block has a fixed groove in the center and is located on the outer surface of the composite water injection pipe. Two buffer grooves are formed inside the protective block on the left and right sides of the fixed groove. Buffer springs are fixedly installed on the opposite sidewalls of the two buffer grooves, and movable plates are fixedly installed on the opposite sides of the two buffer springs. This layered water injection device, by incorporating buffer springs, ensures that the two blocks are firmly attached to the composite water injection pipe under the action of the buffer springs. When subjected to external forces or force majeure, most of the force is absorbed by the buffer springs through the blocks, connecting rod, and movable plates, and can quickly reset under the interaction of the two buffer springs, thus maintaining excellent overall stability.

[0008] The above-mentioned device uses a buffer spring on the outer surface of the composite water injection pipe to resist the impact of external forces. Although it has a certain effect, it has limited compensation for the axial expansion and contraction of the water injection pipe column and there is still room for improvement.

[0009] In summary, anti-creep structures have been designed and adopted in current oilfield precision layered water injection tubing to prevent sealing failure caused by tubing vibration. However, existing anti-creep water injection tubing still has the following defects: the rubber sleeves are prone to damage and detachment when fluctuating up and down, and may even migrate between layers, leading to sealing failure; there is no self-compensating structure between the rubber sleeves, so vibration under interlayer pressure difference cannot be effectively absorbed and automatically compensated for the sealing gap, resulting in limited rubber sleeve seal life; and the long-term anti-creep sealing capability of the water injection tubing is affected. Summary of the Invention

[0010] The purpose of this invention is to provide a telescopic compensation-type layered water injection sealing device, which solves the problem that current water injection sealing devices lack a compensation mechanism for the gap between the water injection tubing sealed by the rubber sleeve, resulting in limited rubber sleeve seal life and affecting the anti-creep long-term sealing ability of the water injection tubing. This improves the anti-creep capability of the water injection tubing, enhances its sealing performance in the annular space of the oil casing, reduces the resonance energy caused by high-pressure pulsation and fluid disturbance in the water injection tubing, prevents accidents such as tubing breakage and fracture, and ensures the normal operation of water injection and oil production in the water injection well.

[0011] The technical solution of this utility model is:

[0012] A telescopic compensation type layered water injection sealing device is provided with a rubber cylinder and a spring, wherein:

[0013] The upper and lower rubber cylinders installed outside the upper and lower water injection pipes are respectively equipped with hydraulic chamber one and hydraulic chamber two connected by a connecting hose;

[0014] A pressure transmission hole, located in the upper water injection pipe and connected to the hydraulic chamber, is connected to the hydraulic pump on the ground via a hydraulic pipeline.

[0015] The upper water injection pipe and the lower water injection pipe are connected by a telescopic compensation mechanism. A spring is installed between the sealing cylinder and the telescopic sleeve in the telescopic compensation mechanism. The upper water injection pipe is sequentially and fixedly connected to the sealing cylinder, the corrugated pipe, the sealing sleeve, and the fixing ring installed outside the lower water injection pipe and below the telescopic sleeve.

[0016] The water inlet pipe can move up and down within the telescopic sleeve and the retaining ring.

[0017] Preferably, a push block is threadedly connected to the outside of the water injection pipe below the fixed ring, which can push the fixed ring, sealing sleeve, corrugated pipe and telescopic sleeve to assist the water injection pipe to move upward. The outer diameter of the push block is smaller than the outer diameter of the fixed ring.

[0018] Preferably, the upper inner circle of the sealing cylinder is provided with an internal thread that can be threaded to the installed upper water injection pipe, the lower cylinder of the sealing cylinder is provided with a telescopic groove that can accommodate a spring and a telescopic sleeve, and a sealing ring groove is provided in the inner wall of the telescopic groove below the spring that can accommodate a sealing ring.

[0019] Preferably, the telescopic sleeve is a cylindrical body with an L-shaped cross-section, the upper part of the telescopic sleeve can slide in the telescopic groove and the inner diameter of the lower part of the sleeve is smaller than the inner diameter of the sealing cylinder.

[0020] Preferably, the inner circle of the sealing sleeve is a non-uniform diameter inner circle, with the inner diameter of the upper inner circle of the sealing sleeve being larger than that of the lower inner circle; the inner diameter of the upper inner circle of the sealing sleeve matches the outer diameter of the sealing cylinder, and the inner diameter of the lower inner circle matches the outer diameter of the fixing ring.

[0021] Preferably, the sealing sleeve is a non-uniform diameter cylindrical body made of rubber material, with the upper inner cavity of the sealing sleeve fitted outside the sealing cylinder and the lower inner cavity vulcanized and fixed outside the fixing ring; the bellows is a metal pipe, with the upper end of the bellows welded to the outside of the sealing cylinder and the lower pipe body vulcanized and fixed together with the sealing sleeve.

[0022] Preferably, the inner diameter of the fixing ring matches the outer diameter of the lower water injection pipe, and the inner circle of the fixing ring is provided with a sealing ring groove 2 that can accommodate the sealing ring 2.

[0023] Preferably, a sealing gasket one is vulcanized and fixed to the lower end face of the telescopic sleeve, and a sealing gasket two is vulcanized and fixed to the upper end face of the fixing ring.

[0024] Preferably, the pressure transmission hole in the upper water injection pipe corresponding to the hydraulic chamber is misaligned with the communication hole of the connecting hose. The upper water injection pipe has two pressure transmission holes, one of which is connected to the hydraulic chamber and the other is located in the pipe body of the upper water injection pipe above the upper rubber cylinder. The lower end of the hydraulic pipeline passes through the two pressure transmission holes and is connected to the hydraulic chamber, and is connected to the ground and hydraulic pump outside the water injection pipe column.

[0025] Preferably, the upper and lower rubber sleeves are vulcanized and fixed to the outside of the upper and lower water injection pipes, respectively; a gap of 5cm-8cm is provided between the upper and lower water injection pipes, and the outer circles of the outer ends of the upper and lower water injection pipes are provided with external threads and can be connected to the coupling threads in the water injection pipe column.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] 1. This device is connected to the water injection pipe column through an upper water injection pipe and a lower water injection pipe. The upper water injection pipe and the lower water injection pipe are connected by an expansion compensation mechanism. The expansion compensation mechanism replaces the traditional rigid connection structure, which can effectively buffer the vibration of the water injection pipe column caused by high pressure pulsation and fluid disturbance.

[0028] 2. A telescopic assembly consisting of a telescopic sleeve, spring, bellows, and sealing sleeve is installed to absorb vibration energy during the water injection process. It can move upwards along with the lower water injection pipe to automatically compensate for the affected water injection pipe string.

[0029] 3. This device is equipped with two rubber cylinders, one above the other. The two cylinders are connected by a hose to form a synchronous expansion working mode with two hydraulic chambers, which can achieve a structure that can simultaneously provide radial sealing and improve the overall sealing performance.

[0030] 4. The combination uses a multi-stage sealing structure, including sealing rings and sealing gaskets, to form a composite seal in the longitudinal and radial directions, enhancing the sealing effect;

[0031] In summary, this device is suitable for high-efficiency stratified water injection tubing in oilfield development, offering vibration and creep protection, and effectively absorbing high-frequency axial impacts and radial disturbances generated in the wellbore. Data from 150 hours of indoor testing shows that it can absorb over 85% of dynamic impact energy, significantly reducing the structural damage rate of the packer. Structural vibration fatigue tests demonstrate that the device can operate stably under 20MPa high pressure and 10Hz vibration conditions, exhibiting high reliability.

[0032] This device utilizes a telescopic compensation mechanism comprised of a telescopic sleeve, spring, bellows, sealing sleeve, and other components. This mechanism absorbs vibration energy generated during water injection and compensates for gaps in the sealing system, significantly enhancing its vibration resistance. The upper and lower radial seals formed by the upper and lower rubber sleeves, combined with multiple sealing rings and gaskets, increase the sealing force by approximately 40%, effectively preventing water leakage and cross-contamination.

[0033] The entire device adopts a modular structure, which can be disassembled and replaced on-site within 2 hours, reducing the maintenance time by more than half compared with traditional packers, and has significant performance benefits. Attached Figure Description

[0034] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the external structure of this utility model; Figure 2 for Figure 1 Cross-sectional view of the connection and structure of the upper and lower rubber tubes; Figure 3 for Figure 1 Schematic diagram of the telescopic compensation mechanism; Figure 4 for Figure 2 A schematic diagram of the structure of the central sealing cylinder and the telescopic sleeve.

[0035] In the diagram: 1. Upper water injection pipe; 2. Upper rubber sleeve; 3. Lower water injection pipe; 4. Lower rubber sleeve; 5. Sealing sleeve; 6. Hydraulic chamber one; 7. Hydraulic pipeline; 8. Connecting hose; 9. Hydraulic chamber two; 10. Telescopic groove; 11. Telescopic sleeve; 12. Spring; 13. Sealing ring groove one; 14. Sealing ring one; 15. Sealing gasket one; 16. Sealing ring groove two; 17. Sealing gasket two; 18. Sealing ring two; 19. Push block; 20. Fixing ring; 21. Corrugated pipe; 22. Detailed Implementation

[0036] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of this utility model. The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0038] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, in the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] See Figures 1-4 A telescopic compensation type layered water injection sealing device, comprising a rubber cylinder and a spring 13, wherein:

[0040] The upper rubber sleeve 2 and the lower rubber sleeve 4, which are installed outside the upper water injection pipe 1 and the lower water injection pipe 3, are respectively provided with hydraulic chamber 7 and hydraulic chamber 10 connected by a connecting hose 9;

[0041] The pressure transmission hole, which is located in the upper water injection pipe 1 and communicates with the hydraulic chamber 7, is connected to the hydraulic pump on the ground through the hydraulic pipeline 8.

[0042] The upper water injection pipe 1 and the lower water injection pipe 3 are connected by a telescopic compensation mechanism. The spring 13 is installed between the sealing cylinder 5 and the telescopic sleeve 12 in the telescopic compensation mechanism. The upper water injection pipe 1 is sequentially and fixedly connected to the sealing cylinder 5, the corrugated pipe 22, the sealing sleeve 6, and the fixing ring 21 installed outside the lower water injection pipe 3 and located below the telescopic sleeve 12.

[0043] The water inlet pipe 3 can move up and down within the telescopic sleeve 12 and the fixing ring 21.

[0044] This utility model is provided with two rubber cylinders, namely upper rubber cylinder 2 and lower rubber cylinder 4. The hydraulic chamber 1 7 and hydraulic chamber 2 10 in the two rubber cylinders are connected by a connecting hose 9. Liquid is injected into hydraulic chamber 1 7 through hydraulic pipeline 8 connected to the ground hydraulic pump and transported to hydraulic chamber 2 10 through the connecting hose 9. After the upper rubber cylinder 2 and lower rubber cylinder 4 expand, they seal the annular space between the water injection pipe column and the sleeve.

[0045] The telescopic compensation mechanism connecting the upper water injection pipe 1 and the lower water injection pipe 3 mainly consists of a sealing cylinder 5, a bellows pipe 22, a sealing sleeve 6, a telescopic sleeve 12, and a fixing ring 21. During water injection, high-pressure pulsations and fluid disturbances cause vibration or vertical movement of the water injection string within the wellbore. The lower water injection pipe 3, movably connected to the telescopic sleeve 12 and the fixing ring 21, can slide up and down within them, providing flexible compensation for the vibrating and moving water injection string. The spring 13 provides buffering, reducing the resonance energy caused by high-pressure pulsations and fluid disturbances in the water injection string. This device connects to the water injection string via the upper water injection pipe 1 and the lower water injection pipe 3, forming a flexible connection that effectively reduces the transmission efficiency of resonance energy, making it less likely to cause resonance in the water injection string. This prevents the device from loosening or failing, improving the anti-creep capability of the water injection string equipped with this device.

[0046] Meanwhile, this utility model installs the upper rubber sleeve 2 and the lower rubber sleeve 4, which are sealed by hydraulic expansion, on the outside of the upper water injection pipe 1 and the lower water injection pipe 3, respectively, forming a double-point support structure. This enhances the pipe's ability to adhere to the wall and effectively improves the sealing performance of the device for the annular space between the water injection string and the casing. It prevents accidents such as breakage or detachment of the water injection string, ensuring the normal operation of water injection and oil production in the water injection well, and has significant effects.

[0047] Based on the above embodiment one, the present invention also has the following embodiments:

[0048] In a preferred embodiment, a push block 20 is threadedly connected to the outside of the water inlet pipe 3 below the fixing ring 21. ， The pusher block 20 can push the fixing ring 21, sealing sleeve 6, corrugated pipe 22 and telescopic sleeve 12 to assist the lower water injection pipe 3 to move upward. The outer diameter of the pusher block 20 is smaller than the outer diameter of the fixing ring 21.

[0049] In a preferred embodiment: the upper inner circle of the sealing cylinder 5 is provided with an internal thread and can be threadedly connected to the installed upper water injection pipe 3. The lower cylinder of the sealing cylinder 5 is provided with a telescopic groove 11 and can accommodate a spring 13 and a telescopic sleeve 12. A sealing ring groove 14 is provided in the inner wall of the telescopic groove 11 below the spring 13, which can accommodate a sealing ring 15. A seal is formed between the telescopic groove 11 and the telescopic sleeve 12.

[0050] In a preferred embodiment, the telescopic sleeve 12 is a cylindrical body with an L-shaped cross-section. The upper part of the telescopic sleeve 12 can slide in the telescopic groove 11, and the inner diameter of the lower part of the sleeve is smaller than the inner diameter of the sealing cylinder 5. The telescopic sleeve 12 stops at the lower end of the sealing cylinder 5.

[0051] In a preferred embodiment: the inner circle of the sealing sleeve 6 is a non-uniform diameter inner circle, the inner diameter of the upper inner circle of the sealing sleeve 6 is larger than the inner diameter of the lower inner circle; the inner diameter of the upper inner circle of the sealing sleeve 6 matches the outer diameter of the sealing cylinder 5 and the inner diameter of the lower inner circle matches the outer diameter of the fixing ring 21.

[0052] In a preferred embodiment: the sealing sleeve 6 is a non-uniform diameter cylindrical body made of rubber material. The upper inner cavity of the sealing sleeve 6 is fitted outside the sealing cylinder 5, and the lower inner cavity is vulcanized and fixed outside the fixing ring 21. The bellows 22 is a metal pipe. The upper end of the bellows 22 is welded to the outside of the sealing cylinder 5, and the lower pipe body is vulcanized and fixed together with the sealing sleeve 6. The telescopic sleeve 12, spring 13, bellows 22, sealing sleeve 6, and fixing ring 21 together form a telescopic assembly. When the lower water injection pipe 3 moves upward, under the push of the push block 20, the telescopic assembly can move upward accordingly, automatically compensating for the affected water injection pipe column.

[0053] In a preferred embodiment, the inner diameter of the retaining ring 21 matches the outer diameter of the lower water inlet pipe 3, and a sealing ring groove 17 is provided on the inner circle of the retaining ring 21 to accommodate a sealing ring 19. The sealing ring 19 ensures a seal between the retaining ring 21 and the lower water inlet pipe 3.

[0054] In a preferred embodiment, a sealing gasket 16 is vulcanized and fixed to the lower end face of the telescopic sleeve 12, and a sealing gasket 28 is vulcanized and fixed to the upper end face of the fixing ring 21. This further ensures the seal between the water injection pipe 3 and the telescopic compensation mechanism and helps absorb the resonance energy caused by high-pressure pulsation and fluid disturbance.

[0055] In a preferred embodiment, the pressure-transmitting hole in the upper water injection pipe 1 corresponding to the hydraulic chamber 7 is offset from the connecting hole of the connecting hose 9. The upper water injection pipe 1 has two pressure-transmitting holes: one communicates with the hydraulic chamber 7, and the other is located within the pipe body of the upper water injection pipe 1 above the upper rubber sleeve 2. The lower end of the hydraulic line 8 passes through the two pressure-transmitting holes, communicates with the hydraulic chamber 7, and connects to the ground outside the water injection pipe column, connecting to the hydraulic pump. The offset arrangement of the pressure-transmitting hole and the connecting hole of the connecting hose 9 ensures the strength of the upper water injection pipe 1 while facilitating the placement of the connecting hole and the pressure-transmitting hole within the upper water injection pipe 1. The two pressure-transmitting holes in the upper water injection pipe 1 allow the hydraulic line 8 to communicate with the hydraulic chamber 7 while simultaneously connecting to the ground outside the water injection pipe column.

[0056] In a preferred embodiment: the upper rubber sleeve 2 and the lower rubber sleeve 4 are respectively vulcanized and fixed to the outside of the upper water injection pipe 1 and the lower water injection pipe 3; a gap of 5cm-8cm is provided between the upper water injection pipe 1 and the lower water injection pipe 3; the outer circles of the outer ends of the upper water injection pipe 1 and the lower water injection pipe 3 are provided with external threads and can be connected to the coupling threads in the water injection pipe column.

[0057] During the well running process, this device is connected to the water injection string via an upper water injection pipe 1 and a lower water injection pipe 3. Hydraulic anchors are installed on the outside of the water injection string connected to both ends of the device to further enhance the fixation and support of the device in the wellbore.

[0058] The working principle of this device is as follows: During the water injection process in the injection well, the vibration generated inside the well is absorbed by the sealing sleeve 6 in the telescopic compensation mechanism, reducing the damage to the sealing device caused by the vibration. When the water injection string vibrates, the lower water injection pipe 3 shakes, which pushes the fixed ring 21 upward through the push block 20 and squeezes the upper telescopic sleeve 12 upward. The telescopic sleeve 12 and the spring 13 installed in the sealing cylinder 5 eliminate the impact force, preventing the vibration force from affecting the upper water injection pipe 1, avoiding direct collision between the upper water injection pipe 1 and the lower water injection pipe 3, absorbing the impact energy, and extending the service life of the device.

[0059] Secondly, a pressure transmission hole is opened in the upper water injection pipe 1. The pressure transmission hole in the hydraulic chamber 1 7 is connected to the hydraulic pump at the wellhead through the hydraulic line 8. The hydraulic line 8 injects the high-pressure liquid through the pressure transmission hole into the hydraulic chamber 1 7 in the upper rubber sleeve 2 outside the upper water injection pipe 1. The hydraulic chamber 1 7 then delivers the high-pressure liquid through the connecting hose 9 to the hydraulic chamber 2 10 inside the lower rubber sleeve 4 fixed outside the lower water injection pipe 3. This causes the upper rubber sleeve 2 and the lower rubber sleeve 4 to be compressed and expanded, and then compressed by the external wellbore, sealing the annular gap between the sealing device and the wellbore. There are two rubber sleeves, and the upper rubber sleeve 2 and the lower rubber sleeve 4 make the sealing device more firmly fixed in the well, ensuring the normal operation of water injection in the oilfield.

[0060] The embodiments described above are merely typical examples, but the present invention is not limited to these embodiments. Those skilled in the art can make modifications without departing from the spirit and teachings of 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 inventive spirit and concept of the present invention should be included within the protection scope of the present invention. Therefore, the protection scope is not limited to the above description.

Claims

1. A telescopic compensating layered water injection packer with rubber sleeve and spring, characterized in that, The upper and lower rubber sleeves installed outside the upper and lower water injection pipes are respectively equipped with hydraulic chamber one and hydraulic chamber two connected by a connecting hose; the pressure transmission hole opened in the upper water injection pipe and connected to hydraulic chamber one is connected to the hydraulic pump on the ground through a hydraulic pipeline; the upper and lower water injection pipes are connected by a telescopic compensation mechanism, and a spring is installed between the sealing cylinder and the telescopic sleeve in the telescopic compensation mechanism. The upper water injection pipe is sequentially and fixedly connected to the sealing cylinder, the bellows, the sealing sleeve, and the fixing ring installed outside the lower water injection pipe and located below the telescopic sleeve; the lower water injection pipe can move up and down in the telescopic sleeve and the fixing ring.

2. The telescopic compensation type layered water injection sealing device as described in claim 1, characterized in that, in The water injection pipe below the fixed ring is also threadedly connected to a push block, which can push the fixed ring, sealing sleeve, corrugated pipe and telescopic sleeve to assist the water injection pipe to move upward. The outer diameter of the push block is smaller than the outer diameter of the fixed ring.

3. The stretch-compensated zonal water injection packer of claim 2, wherein the stretch-compensated zonal water injection packer is configured to be set in the wellbore by the injection of the water into the wellbore. The upper inner circle of the sealing cylinder is provided with an internal thread and can be threaded to the installed upper water injection pipe. The lower cylinder of the sealing cylinder is provided with a telescopic groove and can accommodate a spring and a telescopic sleeve. The inner wall of the telescopic groove below the spring is provided with a sealing ring groove that can accommodate a sealing ring.

4. The stretch-compensated layered water injection packer of claim 3, wherein, The telescopic sleeve is a cylindrical body with an L-shaped cross-section. The upper part of the telescopic sleeve can slide in the telescopic groove, and the inner diameter of the lower part of the sleeve is smaller than the inner diameter of the sealing cylinder.

5. The stretch-compensated zonal water injection packer of claim 2, wherein the stretch-compensated zonal water injection packer is characterized by, The inner circle of the sealing sleeve is a non-uniform diameter inner circle, and the inner diameter of the upper inner circle of the sealing sleeve is larger than the inner diameter of the lower inner circle; the inner diameter of the upper inner circle of the sealing sleeve matches the outer diameter of the sealing cylinder and the inner diameter of the lower inner circle matches the outer diameter of the fixing ring.

6. The stretch-compensated layered water injection packer of claim 5, wherein, The sealing sleeve is a non-uniform diameter cylindrical body made of rubber material. The upper inner cavity of the sealing sleeve is fitted outside the sealing cylinder, and the lower inner cavity is vulcanized and fixed outside the fixing ring. The bellows is a metal pipe. The upper end of the bellows is welded to the outside of the sealing cylinder, and the lower pipe body is vulcanized and fixed together with the sealing sleeve.

7. The stretch-compensated layered water injection packer of claim 6, wherein the stretch-compensated layered water injection packer is characterized by, The inner diameter of the fixing ring matches the outer diameter of the lower water inlet pipe, and the inner circle of the fixing ring is provided with a sealing ring groove 2 that can accommodate the sealing ring 2.

8. The stretch-compensated zonal water injection packer of claim 4, wherein, A sealing gasket one is vulcanized and fixed to the lower end face of the telescopic sleeve, and a sealing gasket two is vulcanized and fixed to the upper end face of the fixing ring.

9. The telescopic compensation type layered water injection sealing device as described in claim 1, characterized in that, The pressure transmission hole in the upper water injection pipe corresponding to the hydraulic chamber is misaligned with the connecting hole of the connecting hose. There are two pressure transmission holes in the upper water injection pipe, one of which is connected to the hydraulic chamber and the other is located in the pipe body of the upper water injection pipe above the upper rubber cylinder. The lower end of the hydraulic pipeline passes through the two pressure transmission holes and is connected to the hydraulic chamber, and is connected to the ground and hydraulic pump outside the water injection pipe column.

10. The stretch-compensated zonal water injection packer of claim 1, wherein, The upper and lower rubber sleeves are respectively vulcanized and fixed to the outside of the upper and lower water injection pipes; a gap of 5cm-8cm is provided between the upper and lower water injection pipes, and the outer circles of the outer ends of the upper and lower water injection pipes are provided with external threads and can be connected to the coupling threads in the water injection pipe column.

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