Separated layer water injection well packer seal examining and pressure relief device and working method
By designing a layered water injection well packer sealing and pressure relief device with multiple sealing rings and threaded connections, the problems of slow pressure relief and sealing failure were solved, achieving rapid pressure relief and efficient sealing, reducing maintenance costs, and ensuring the stability and safety of the device.
Patent Information
- Application Number
- CN202411064071.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2026-02-06
AI Technical Summary
Existing packer sealing and pressure relief devices for stratified water injection wells suffer from slow pressure relief speed, requiring long waiting times, the inability to replace the main body of the pressure relief tool independently, failure of the pressure transmission channel seal after long-term use, and the lack of anti-back-locking devices, which leads to the risk of the sealing section falling off.
A pressure relief device for packer sealing in a layered water injection well was designed, comprising an upper connector, a pressure relief section, and a lower connector. Through multiple sealing ring designs and threaded connections, the stability and safety of the device under high pressure conditions are ensured. Sealing rings A and B are provided between the pressure relief section and the upper connector, and sealing ring C is provided between the pressure relief section and the lower connector. During the pressure relief process, rapid pressure relief is achieved by lifting the instrument.
It achieves rapid pressure relief, improves the sealing performance and safety of the device, reduces maintenance costs and repair difficulty, extends service life, and prevents pressure leakage, loosening or reverse threading.
Smart Images
Figure CN121473745A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of oil production testing, in particular to a layered water injection well packer sealing test and pressure relief device and working method. BACKGROUND
[0002] The packer is a commonly used tool in oilfield development, which effectively separates different oil layers, ensures that each oil layer can obtain appropriate water injection volume, helps to improve the recovery rate of the oilfield, and avoids mutual interference between different oil layers, thereby improving the overall efficiency of oilfield development. The packer sealing test and pressure relief device is a device used in water injection wells, which mainly includes two aspects: one is to test the sealing performance of the packer, and the other is to perform necessary pressure relief operation. The sealing performance test is to ensure that the packer can maintain good sealing effect under high pressure environment to prevent cross flow and pressure leakage between oil layers. The pressure relief operation is to release the high pressure in the well in time when the packer has problems or needs maintenance to ensure the safety of equipment and personnel.
[0003] Under the prior art, there are some problems in using the layered water injection well packer sealing test and pressure relief device: 1. The pressure relief speed is slow, which will cause the operation time to be lengthened and affect the work efficiency, and additional time is consumed; 2. Water needs to be discharged for pressure relief when necessary, which may bring out some liquid containing harmful substances, and if not treated, it will have negative impact on soil, water source, etc.; 3. The existing pressure relief tool main body will be worn out after long-term use, the pressure transmission channel will be sealed and the accuracy of pressure data will be reduced, thereby affecting the sealing test result; 4. The existing packer does not have an anti-backoff device in the sealing section, and if there is no anti-backoff device in the operation process, the sealing section may be accidentally detached, thereby affecting the entire well production. SUMMARY
[0004] (I) Technical problem to be solved The present application provides a layered water injection well packer sealing test and pressure relief device and working method to overcome the problems of slow pressure relief speed, long waiting time in pressure relief process, and the pressure relief tool main body cannot be replaced alone, and the pressure transmission channel is not sealed tightly after long-term wear.
[0005] (II) Technical scheme To achieve the above-mentioned purpose, the present application provides a layered water injection well packer sealing test and pressure relief device, which comprises: an upper joint, a pressure relief section and a lower joint. The upper joint is composed of two parts, the upper end of the upper joint is a hollow cylindrical structure, and the lower end of the upper joint is a hollow cylindrical structure, the outer diameter of the upper end of the upper joint is smaller than that of the lower end; The outer wall of the upper joint is sleeved with a sealing ring A, and the upper end of the upper joint is provided with external threads. The lower end of the upper joint is provided with a pressure relief section, the pressure relief section is a hollow cylindrical structure, and the outer wall of the pressure relief section is provided with a through hole; A plurality of sealing rings B are arranged between the pressure relief section and the upper joint. The lower end of the pressure relief section is provided with a lower joint, the lower end of the pressure relief section is a conical structure, and the lower end of the pressure relief section is embedded in the lower joint. The lower joint is a hollow cylindrical structure, and the outer wall of the lower joint is provided with a through hole. The outer wall of the pressure relief section is provided with a through hole, and a plurality of sealing rings C are arranged on both sides of the through hole.
[0006] Preferably, a groove is arranged between the upper end of the upper joint and the lower end of the right, and the sealing ring A is embedded in the groove, and the sealing ring A is used for interference fit with the external thread of the upper end of the upper joint to prevent thread back-off.
[0007] Preferably, the lower end of the upper joint is provided with an internal thread, the upper end of the pressure relief section is provided with an external thread, the upper end of the pressure relief section is embedded in the upper joint, and the upper joint is threadedly connected with the pressure relief section.
[0008] Preferably, a step with an outer edge is arranged at the bottom of the external thread of the upper end of the pressure relief section, and the step is used for limiting the pressure relief section.
[0009] Preferably, the size of the through hole arranged on the outer wall of the pressure relief section matches the size of the through hole arranged on the outer wall of the lower joint.
[0010] Preferably, a step with an outer edge is arranged at the lower end of the pressure relief section, and the step is used for limiting the pressure relief section.
[0011] Preferably, the plurality of sealing rings C are used for sealing the gap between the pressure relief section and the lower joint.
[0012] Preferably, the sealing ring B and the thread arranged on the upper end of the pressure relief section form an interference fit, and the interference fit is used for preventing thread back-off between the pressure relief section and the upper joint.
[0013] Preferably, the lower end of the pressure relief section is slidably connected with the lower joint, and the pressure relief section can move axially in the lower joint.
[0014] In another aspect, the application also provides a device working method, which comprises: In step S1, the layered injection well packer sealing test and pressure relief device is installed on the layered injection well packer through the lower joint 3, a pressure gauge is connected above the upper joint, the connection between the components is ensured to be firm, and the integrity of the sealing ring A, the sealing ring B and the sealing ring C is checked. In step S2, when the layered injection well packer sealing test and pressure relief device is not working, the lower end of the pressure relief section is inserted into the lower joint, and the through hole arranged on the outer wall of the pressure relief section is sealed by the lower joint. Step S3, the lower end of the pressure relief section is connected with the seal checking sealing section; Step S4, the pressure gauges are used to record the pressure of the upper and lower parts of the working barrel respectively, to ensure the accuracy of the seal checking work; Step S5, when the seal checking work is completed, the instrument is lifted up, and the leather cup on the seal checking sealing section is kept in an expanded state due to the pressure, so that the sealing section is fixed and does not move; Step S6, under the action of the lifting force, the pressure relief section runs upward until the through hole provided on the outer wall of the pressure relief section is communicated with the through hole provided on the outer wall of the lower joint to release the pressure; Step S7, with the balance of the pressure, the leather cup on the seal checking sealing section gradually shrinks, the instrument is smoothly lifted up, and the pressure relief work is completed.
[0015] (Three) beneficial effects The layered water injection well packer seal checking and pressure relief device and the working method can realize the composition of the upper joint, the pressure relief section and the lower joint, the structure is simple and clear, convenient to assemble and disassemble, and only the instrument needs to be lifted up to realize the pressure relief function in the operation process, the operation is simple, the sealing ring A and the sealing ring B are arranged between the upper joint and the pressure relief section, the sealing ring C is arranged between the pressure relief section and the lower joint, the multiple sealing design effectively improves the sealing performance of the device, prevents the pressure leakage, ensures the safety and reliability of the pressure relief process, the interference fit is realized between the pressure relief section and the upper joint through the sealing ring B, the thread loosening or back-off is prevented in the lifting process, and the stability and safety of the device in the high-pressure environment are ensured; the sealing ring is a consumable part, and may need to be replaced after long-term use, the sealing ring of the device is designed as a replaceable structure, the maintenance cost and the maintenance difficulty are reduced, and the service life of the device is prolonged. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 A layered water injection well packer seal checking and pressure relief device structure schematic diagram is shown. Figure 2 A layered water injection well packer seal checking and pressure relief device working flow chart is shown.
[0017] Wherein: 1, upper joint; 2, pressure relief section; 3, lower joint; 4, sealing ring A; 5, sealing ring B; 6, sealing ring C. DETAILED DESCRIPTION
[0018] The application will be described in detail below with reference to the drawings and embodiments, and the technical solutions in the embodiments of the application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.
[0019] In the description of the present application, it is necessary to understand that the orientations or positional relationships indicated by "up", "down", "left", "right", "inner", "outer", "top", "bottom", etc. are based on the orientations or positional relationships shown in the drawings, and the purpose is only to facilitate the description of the present application and simplify the description, and it does not indicate or imply that the indicated components must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0020] As shown in Figures 1-2 , the present application provides a layered water injection well packer sealing test and pressure relief device, comprising: an upper joint 1, a pressure relief section 2 and a lower joint 3; The upper joint 1 is one of the key parts of the entire layered water injection well packer sealing test and pressure relief device, the upper joint 1 is composed of two parts, the upper end and the lower end are both hollow cylindrical structures, but the outer diameter of the upper end is smaller than that of the lower end, this design helps to provide better stability when installing the pressure gauge, a groove is provided between the upper end and the lower end of the upper joint 1, which is used to embed the sealing ring A4, the sealing ring A4 is embedded in the groove, its function is to form an interference fit with the external threads provided on the upper end of the upper joint 1, thereby preventing the pressure gauge threads from being reversed when the lifting device is lifted; When the pressure gauge threads are connected to the external threads on the upper end of the upper joint 1, the sealing ring A4 can effectively prevent the threads from being reversed, ensuring the firmness of the connection, the cooperation of the sealing ring A4 with the groove, and the interference fit with the pressure gauge threads, together guarantee the sealing performance of the connection, preventing leakage in high pressure environment.
[0021] The upper joint 1 is connected with the pressure relief section 2, the lower end of the upper joint 1 is provided with internal threads, while the upper end of the pressure relief section 2 is provided with external threads, so that the pressure relief section 2 can be embedded in the upper joint 1 and fixed by threaded connection, the bottom of the external threads on the upper end of the pressure relief section 2 is provided with a stepped outer edge, the function of this step is to limit the pressure relief section 2, preventing it from rotating or moving excessively during installation and use, a plurality of sealing rings B5 are provided between the pressure relief section 2 and the upper joint 1, the function of these sealing rings is to form an interference fit with the threads provided on the upper end of the pressure relief section 2, thereby preventing the threads between the pressure relief section 2 and the upper joint 1 from being reversed; The pressure relief section 2 is a hollow cylindrical structure, the outer wall thereof is provided with through holes, the size of these through holes matches the size of the through holes provided on the outer wall of the lower joint 3, to ensure that the fluid can flow smoothly during pressure relief, a plurality of sealing rings C6 are provided on both sides of the through holes provided on the outer wall of the pressure relief section 2, the function of these sealing rings is to ensure that the fluid does not leak out from both sides of the through holes during pressure relief; The connection between the upper connector 1 and the pressure relief section 2, and the structural design of the pressure relief section 2, fully consider the stability and sealing performance of the connection. Through the cooperation of threaded connection, stepped limit, and sealing ring, it ensures the key role of the packer sealing and pressure relief device in the stratified water injection well. This design not only effectively prevents thread backing but also ensures the sealing performance of the connection and both sides of the through hole, thereby improving the reliability and safety of the entire device.
[0022] The lower end of the pressure relief section 2 is provided with a lower connector 3. The lower end of the pressure relief section 2 has a conical structure that can be embedded in the lower connector 3. The lower connector 3 is a hollow cylindrical structure with through holes on its outer wall. These through holes match the through holes on the outer wall of the pressure relief section 2 to ensure that the fluid can flow smoothly during the pressure relief process. Several sealing rings C6 are provided between the lower end of the pressure relief section 2 and the lower connector 3. The function of the sealing rings C6 is to seal the gap between the pressure relief section 2 and the lower connector 3 to prevent leakage under high pressure. The lower end of the pressure relief section 2 and the lower connector 3 are connected by a sliding connection, which allows the pressure relief section 2 to move axially in the lower connector 3. This allows the pressure relief section 2 to make axial displacement within a certain range, thereby adapting to different working environments and requirements. In actual use, the pressure relief section 2 is embedded in the lower connector 3 through its tapered structure at the lower end. The setting of the sealing rings C6 ensures the sealing performance of the connection and prevents leakage under high pressure. The connection design between the pressure relief section 2 and the lower connector 3 fully considers the stability and sealing of the connection.
[0023] The following is a detailed description of the actual working scenario of a packer sealing and pressure relief device and its working method for a stratified water injection well.
[0024] like Figure 2 As shown, the present invention provides a method for operating a packer sealing and pressure relief device for stratified water injection wells, comprising: Step S1: Install the packer sealing and pressure relief device of the stratified water injection well onto the packer through the lower connector 3, connect the pressure gauge above the upper connector 1, ensure that the connection between each component is firm, and check the integrity of the sealing rings A4, B5 and C6. Step S2: When the packer sealing and pressure relief device of the layered water injection well is not working, the lower end of the pressure relief section 2 is inserted into the lower connector 3, and the through hole on the outer wall of the pressure relief section 2 is sealed by the lower connector 3. Step S3: Connect the lower end of the pressure relief section 2 to the sealing section for inspection; Step S4: Use a pressure gauge to record the pressure at the top and bottom of the working cylinder to ensure the accuracy of the sealing inspection. Step S5: After the sealing inspection is completed, the instrument is lifted. Due to the pressure, the diaphragm on the sealing section remains in an expanded state, fixing the sealing section in place. Step S6, under the action of the lifting force, the pressure relief section 2 runs upward until the through hole provided on the outer wall of the pressure relief section 2 is communicated with the through hole provided on the outer wall of the lower joint 3 to release pressure; Step S7, with the balance of pressure, the leather cup on the seal section gradually retracts, the instrument is smoothly lifted, and the pressure relief work is completed.
[0025] It can be understood that the above-mentioned various embodiments mentioned in the present application can be combined with each other to form a combined embodiment without deviating from the principle logic. Due to the limited length, the present application will not be described again.
[0026] Those skilled in the art can understand that in the above method of the specific embodiment, the writing order of each step does not mean a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.
[0027] The layered water injection well packer seal checking and pressure relief device and working method provided by the present application is composed of an upper joint 1, a pressure relief section 2 and a lower joint 3, which has a simple and clear structure and is convenient to assemble and disassemble. During operation, only the instrument needs to be lifted to realize the pressure relief function, which is simple to operate. The upper joint 1 is provided with a sealing ring A4 and a sealing ring B5 between the upper joint 1 and the pressure relief section 2, and a sealing ring C6 is provided between the pressure relief section and the lower joint, which effectively improves the sealing performance of the device, prevents pressure leakage, and ensures the safety and reliability of the pressure relief process. The pressure relief section 2 and the upper joint 1 are in interference fit through the sealing ring B5 to prevent the threads from loosening or back-off during the lifting process, ensuring the stability and safety of the device in a high-pressure environment. The sealing ring is a consumable part that may need to be replaced after long-term use. The sealing ring of the device is designed to be replaceable, which reduces the maintenance cost and difficulty, and prolongs the service life of the device.
[0028] The above has described the embodiments of the present application, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles, practical applications or technical improvements in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.
Claims
1. A packer sealing and pressure relief device for stratified water injection wells, characterized in that, include: Upper connector (1), pressure relief section (2), and lower connector (3); The upper connector (1) consists of two parts: the upper end of the upper connector (1) is a hollow cylindrical structure, the lower end of the upper connector (1) is a hollow cylindrical structure, and the outer diameter of the upper end of the upper connector (1) is smaller than the outer diameter of the lower end. The upper connector (1) is fitted with a sealing ring A (4) on its outer wall, and the upper end of the upper connector (1) is provided with an external thread; The upper connector (1) is provided with a pressure relief section (2) at its lower end. The pressure relief section (2) is a hollow cylindrical structure and the outer wall of the pressure relief section (2) is provided with a through hole. Several sealing rings B (5) are provided between the pressure relief section (2) and the upper connector (1); The lower end of the pressure relief section (2) is provided with a lower connector (3), and the lower end of the pressure relief section (2) is a conical structure, and the lower end of the pressure relief section (2) is embedded in the lower connector (3); The lower connector (3) is a hollow cylindrical structure, and the outer wall of the lower connector (3) is provided with a through hole; The pressure relief section (2) has several sealing rings C (6) on both sides of the through hole on its outer wall.
2. The packer sealing and pressure relief device for stratified water injection wells according to claim 1, characterized in that, The upper connector (1) has a groove between the upper hollow cylindrical structure and the lower right hollow cylindrical structure. The sealing ring A (4) is embedded in the groove. The sealing ring A (4) is used to make an interference fit with the external thread provided at the upper end of the upper connector (1) to prevent the thread from being reversed.
3. The packer sealing and pressure relief device for stratified water injection wells according to claim 1, characterized in that, The lower end of the upper connector (1) is provided with an internal thread, and the upper end of the pressure relief section (2) is provided with an external thread. The upper end of the pressure relief section (2) is embedded in the upper connector (1), and the upper connector (1) and the pressure relief section (2) are threadedly connected.
4. The packer sealing and pressure relief device for stratified water injection wells according to claim 3, characterized in that, The pressure relief section (2) has a step at the bottom of the external thread at the upper end, which limits the pressure relief section (2).
5. The packer sealing and pressure relief device for stratified water injection wells according to claim 1, characterized in that, The size of the through hole on the outer wall of the pressure relief section (2) matches the size of the through hole on the outer wall of the lower connector (3).
6. The packer sealing and pressure relief device for stratified water injection wells according to claim 1, characterized in that, The pressure relief section (2) has a step at its lower end, which limits the pressure relief section (2).
7. The packer sealing and pressure relief device for stratified water injection wells according to claim 6, characterized in that, The plurality of sealing rings C (6) seal the gap between the pressure relief section (2) and the lower connector (3).
8. The packer sealing and pressure relief device for stratified water injection wells according to claim 3, characterized in that, The sealing ring B (5) forms an interference fit with the thread provided at the upper end of the pressure relief section (2) to prevent the thread from being reversed between the pressure relief section (2) and the upper connector (1).
9. The packer sealing and pressure relief device for stratified water injection wells according to claim 6, characterized in that, The lower end of the pressure relief section (2) is slidably connected to the lower connector (3), and the pressure relief section (2) can move axially in the lower connector (3).
10. The working method of the packer sealing and pressure relief device for stratified water injection wells according to any one of claims 1-9, characterized in that, include: Step S1: Install the packer sealing and pressure relief device of the layered water injection well through the lower connector 3 on the packer of the layered water injection well, connect the pressure gauge above the upper connector (1), ensure that the connection between each component is firm, and check the integrity of the sealing ring A (4), sealing ring B (5) and sealing ring C (6). Step S2: When the packer sealing and pressure relief device of the layered water injection well is not working, the lower end of the pressure relief section (2) is inserted into the lower connector (3), and the through hole on the outer wall of the pressure relief section (2) is sealed by the lower connector (3); Step S3: Connect the lower end of the pressure relief section (2) to the sealing section for inspection; Step S4: Use a pressure gauge to record the pressure at the top and bottom of the working cylinder to ensure the accuracy of the sealing inspection. Step S5: After the sealing inspection is completed, the instrument is lifted. Due to the pressure, the diaphragm on the sealing section remains in an expanded state, fixing the sealing section in place. In step S6, under the action of the lifting force, the pressure relief section (2) moves upward until the through hole on the outer wall of the pressure relief section (2) connects with the through hole on the outer wall of the lower connector (3) to release pressure; In step S7, as the pressure balances, the diaphragm on the sealing section of the instrument gradually retracts, and the instrument is lifted smoothly to complete the pressure relief operation.