Mechanical packer for preventing sand burial and sticking

Abstract

The utility model relates to mechanical packer technical field especially relates to a kind of anti-sand burying anti-jamming mechanical packer, including packer main body, fixed ring, mounting ring, hollow filter ring, circular table filter screen, guide slot, guide rod, guide block, guide plate and adjusting spring, the upper end inner wall of packer main body is fixedly provided with fixed ring, the inside of fixed ring is slidably provided with mounting ring, the inside of mounting ring is slidably provided with two groups hollow filter ring, the inside of hollow filter ring is fixedly provided with two groups circular table filter screen, the sidewall of guide rod is provided with guide block, the periphery outer wall of hollow filter ring is fixedly provided with multiple guide plates, the upper and lower sides of guide block are symmetrically provided with two groups adjusting spring, a kind of anti-sand burying anti-jamming mechanical packer of the utility model in the process of use, through the triple innovation of fluid mechanics optimization structure, mechanical vibration self-cleaning system and quick replacement mechanism, while guaranteeing filtering accuracy, prolongs filter screen service life.

Description

Technical Field

[0001] This utility model relates to the field of mechanical packers, and in particular to a mechanical packer for preventing sand burial and jamming. Background Technology

[0002] In the field of oil and gas extraction, especially in shale gas wells and offshore platform operations, sand-bearing fluids pose a severe challenge to the reliability of downhole tools. Traditional mechanical packers, as key well control equipment, have long faced the technical bottleneck of sand burial and blockage in their filtration systems. The planar filter screen structure causes sand particles to accumulate on the filter screen surface, forming sand bridges, which causes rapid blockage of the filter channels, forcing the operation to be interrupted for manual sand removal or filter screen replacement.

[0003] During the use of mechanical packers, traditional planar filters, due to structural design limitations, are prone to forming a buildup layer on the filter surface after sand particles are intercepted, leading to rapid clogging of the filter channels. This is especially problematic in operating environments with high sand content, requiring frequent shutdowns for cleaning or replacement of the filter, severely impacting continuous operation efficiency. Although some existing technologies attempt to achieve self-cleaning through backwashing systems, these are limited by space constraints in operating environments, such as the narrow shafts of shale gas wells. Backwashing systems require additional high-pressure pump sets, occupying a significant amount of space. Traditional filters, subjected to long-term sand impact and accumulation pressure, are prone to irreversible deformation on their surface. Even with high-strength materials, the service life of traditional filters is still difficult to exceed the continuous operation cycle. Furthermore, replacement requires disassembling the packer body, resulting in low maintenance efficiency in high-space-cost scenarios such as offshore platforms. Consequently, it is inconvenient to ensure filtration accuracy while extending filter life in complex operating environments with limited space and stringent continuous operation requirements.

[0004] Therefore, to address the aforementioned challenges of ensuring filtration accuracy while extending filter lifespan in complex working environments with limited space and stringent continuous operation requirements, a mechanical packer designed to prevent sand burial and blockage can be implemented. During operation, when sand-laden liquid enters the packer, it first flows through a double-layered hollow filter ring embedded within a fixed ring. Each hollow filter ring contains symmetrically arranged frustum-shaped filter screens. The conical curved surface design allows sand to be intercepted and automatically slide down the inclined surface to the top edge of the hollow filter ring, avoiding the sand accumulation problem easily caused by traditional flat filter screens. When the upper frustum-shaped filter screen is impacted by fluid, the guide plate on the outer wall of the hollow filter ring slides axially along the guide rod via the guide block, compressing the adjusting spring to generate reciprocating vibration. This mechanical vibration effect causes the sand particles attached to the filter screen surface to continuously fall off to the edge collection area. In summary, this device, through the triple innovation of fluid dynamics optimized structure, mechanical vibration self-cleaning system, and quick replacement mechanism, extends the service life of the filter screen and improves maintenance efficiency while ensuring filtration accuracy. It is particularly suitable for complex working environments with limited space and demanding continuous operation requirements, such as offshore platforms and shale gas wells. Utility Model Content

[0005] To overcome the problem that traditional filter screens are prone to irreversible deformation due to long-term impact and accumulation pressure of sand particles during use, the service life of traditional filter screens is still difficult to exceed the continuous operation cycle, and the replacement operation requires disassembling the main body of the packer. Therefore, it is inconvenient to ensure filtration accuracy and extend the service life of filter screens in complex working environments with limited space and demanding continuous operation requirements.

[0006] The technical solution of this utility model is as follows: a mechanical packer for preventing sand burial and jamming, comprising a packer body, a fixing ring, an mounting ring, a hollow filter ring, a frustum-shaped filter screen, a guide groove, a guide rod, a guide block, a guide plate, and an adjusting spring. A fixing ring is fixedly installed on the upper inner wall of the packer body. An mounting ring is slidably installed inside the fixing ring. Two sets of hollow filter rings are slidably installed inside the mounting ring. Two sets of frustum-shaped filter screens are fixedly installed inside the hollow filter rings. Multiple sets of guide grooves are opened around the inner wall of the fixing ring. A guide rod is fixedly installed inside the guide groove. A guide block is installed on the side wall of the guide rod. Multiple sets of guide plates are fixedly installed around the outer wall of the hollow filter ring. Two sets of adjusting springs are symmetrically arranged on the upper and lower sides of the guide block.

[0007] Preferably, when the mechanical packer is used in complex working conditions with limited space and stringent requirements for continuous operation, when sand-containing liquid enters the packer, it first flows through the double-layer hollow filter rings embedded in the fixed ring. Each hollow filter ring contains a symmetrically arranged frustum-shaped filter screen. Its conical curved surface design allows sand and gravel to be intercepted and automatically slide down the inclined surface to the top edge of the hollow filter ring, avoiding the sand accumulation problem easily caused by traditional flat filter screens. After the liquid is initially filtered by the upper frustum-shaped filter screen, it enters the buffer cavity between the double filter screens and then undergoes secondary fine filtration through the lower frustum-shaped filter screen, forming a double filtration barrier. Combined with the densely distributed filter channels on the filter screen surface, it can intercept sand and gravel of different particle sizes. Its anti-jamming mechanism is reflected in the dynamic adjustment system. When the upper frustum-shaped filter screen is impacted by the fluid, the guide plate on the outer wall of the hollow filter ring slides axially along the guide rod through the guide block, compressing the adjusting spring to generate... The reciprocating vibration, through this mechanical shaking effect, causes sand particles adhering to the filter screen surface to continuously fall off to the edge collection area. Four sets of circumferentially distributed guide rods and adjusting spring assemblies form a three-dimensional vibration matrix, ensuring uniform force distribution across all areas of the filter screen. Combined with the sand and gravel sliding path guided by the frustum structure, this completely solves the core problem of easy clogging in traditional fixed filters. During this process, because the size of the guide plate is larger than that of the guide groove, it can also shield the guide groove during vibration, preventing sand and gravel from entering the interior of the guide groove and thus preventing it from affecting the normal operation of the vibration mechanism. In summary, this device, through the triple innovation of fluid dynamics optimized structure, mechanical vibration self-cleaning system, and quick replacement mechanism, extends the service life of the filter screen and improves maintenance efficiency while ensuring filtration accuracy. It is particularly suitable for complex working environments with limited space and demanding continuous operation requirements, such as offshore platforms and shale gas wells.

[0008] Preferably, the inner wall of the guide plate is fixedly connected to the side wall of the guide block, the guide block is slidably connected to the guide rod, one end of the adjusting spring is fixedly connected to the inner wall of the guide block, the other end of the adjusting spring is fixedly connected to the inner wall of the guide groove, and the adjusting spring is located outside the guide rod.

[0009] Preferably, multiple sets of plug-in strips are fixedly provided on the outer walls of the mounting ring, and multiple sets of plug-in slots are opened on the inner walls of the fixing ring, with the plug-in strips slidingly connected to the plug-in slots.

[0010] Preferably, the upper end of the fixed ring is symmetrically provided with two sets of sliding grooves, a sliding rod is fixedly installed inside the sliding groove, and a sliding shell is slidably installed inside the sliding groove.

[0011] Preferably, the rear end of the sliding housing is slidably connected to the side wall of the sliding rod, and a limiting ring is fixedly provided at the front end of the sliding rod, with the limiting ring located inside the sliding housing.

[0012] Preferably, a locking spring is provided inside the sliding housing, with one end of the locking spring fixedly connected to the inner wall of the sliding housing and the other end of the locking spring fixedly connected to the inner wall of the limiting ring.

[0013] Preferably, the upper inner wall of the connector strip is provided with a locking hole, and a locking rod is fixedly provided on the front side wall of the sliding shell, with the front end of the locking rod engaging with the inner wall of the locking hole.

[0014] The beneficial effects of this utility model are:

[0015] When mechanical packers are used in complex working environments with limited space and demanding continuous operation requirements, sand-laden liquid entering the packer first flows through the double-layer hollow filter rings embedded in the fixed ring. Each hollow filter ring contains symmetrically arranged frustum-shaped filter screens. Their conical curved surface design allows sand and gravel to automatically slide down the inclined surface to the top edge of the hollow filter ring after being intercepted, avoiding the sand accumulation problem easily caused by traditional flat filter screens. After initial filtration by the upper frustum-shaped filter screen, the liquid enters the buffer cavity between the two filter layers and then undergoes secondary fine filtration through the lower frustum-shaped filter screen, forming a double filtration barrier. Combined with the densely distributed filter channels on the filter screen surface, it can intercept sand and gravel of different particle sizes. Its anti-jamming mechanism is reflected in the dynamic adjustment system. When the upper frustum-shaped filter screen is impacted by the fluid, the guide plate on the outer wall of the hollow filter ring slides axially along the guide rod via the guide block, compressing the adjusting spring to generate a reciprocating motion. Vibration, this mechanical shaking effect, causes sand particles attached to the filter screen surface to continuously fall off to the edge collection area. Four sets of circumferentially distributed guide rods and adjusting spring assemblies form a three-dimensional vibration matrix, ensuring uniform force on all areas of the filter screen. Combined with the sand and gravel sliding path guided by the frustum structure, it completely solves the core problem of easy clogging of traditional fixed filter screens. During this process, because the size of the guide plate is set larger than the size of the guide groove, it can also block the guide groove while vibrating, preventing sand and gravel from entering the interior of the guide groove, thereby preventing it from affecting the normal operation of the vibration mechanism. In summary, this device, through the triple innovation of fluid dynamics optimized structure, mechanical vibration self-cleaning system and quick replacement mechanism, extends the service life of the filter screen and improves maintenance efficiency while ensuring filtration accuracy. It is particularly suitable for complex working environments with limited space and demanding continuous operation requirements, such as offshore platforms and shale gas wells. Attached Figure Description

[0016] Figure 1 The diagram shown is a first three-dimensional structural schematic of a mechanical packer for preventing sand burial and jamming according to this utility model.

[0017] Figure 2 The diagram shown is a three-dimensional structural diagram of the top part of the packer body of a mechanical packer for preventing sand burial and jamming according to this utility model.

[0018] Figure 3 The diagram shown is a three-dimensional structural diagram of the top part of the packer body of a mechanical packer for preventing sand burial and jamming according to this utility model.

[0019] Figure 4The diagram shown is a three-dimensional cross-sectional view of the first half of the fixing ring of a mechanical packer for preventing sand burial and jamming according to this utility model.

[0020] Figure 5 The diagram shown is a three-dimensional sectional view of the first half of the mounting ring of a mechanical packer for preventing sand burial and jamming according to this utility model.

[0021] Figure 6 What is shown is Figure 4 Schematic diagram of the three-dimensional structure at the circled mark;

[0022] Figure 7 What is shown is Figure 3 Schematic diagram of the three-dimensional structure at the circled mark;

[0023] Explanation of reference numerals in the attached drawings: 1. Packer body; 2. Fixing ring; 3. Mounting ring; 4. Hollow filter ring; 5. Frustum-shaped filter screen; 6. Guide groove; 7. Guide rod; 8. Guide block; 9. Guide plate; 10. Adjusting spring; 11. Insertion strip; 12. Insertion groove; 13. Slide groove; 14. Slide rod; 15. Slide shell; 16. Limiting ring; 17. Locking spring; 18. Locking hole; 19. Locking rod. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Please see Figure 1 and Figure 5 This utility model provides an embodiment: a mechanical packer for preventing sand burial and jamming, comprising a packer body 1, a fixing ring 2, an mounting ring 3, a hollow filter ring 4, a frustum-shaped filter screen 5, a guide groove 6, a guide rod 7, a guide block 8, a guide plate 9, and an adjusting spring 10. The upper inner wall of the packer body 1 is fixedly provided with a fixing ring 2, the mounting ring 3 is slidably provided inside the fixing ring 2, two sets of hollow filter rings 4 are slidably provided inside the mounting ring 3, two sets of frustum-shaped filter screens 5 are fixedly provided inside the hollow filter rings 4, multiple sets of guide grooves 6 are opened around the inner wall of the fixing ring 2, a guide rod 7 is fixedly provided inside the guide groove 6, a guide block 8 is provided on the side wall of the guide rod 7, multiple sets of guide plates 9 are fixedly provided around the outer wall of the hollow filter rings 4, and two sets of adjusting springs 10 are symmetrically provided on the upper and lower sides of the guide block 8.

[0026] Please see Figure 3 and Figure 7The inner wall of the guide plate 9 is fixedly connected to the side wall of the guide block 8. The guide block 8 is slidably connected to the guide rod 7. One end of the adjusting spring 10 is fixedly connected to the inner wall of the guide block 8, and the other end of the adjusting spring 10 is fixedly connected to the inner wall of the guide groove 6. The adjusting spring 10 is set outside the guide rod 7. When the upper filter screen is impacted by fluid, the guide plate 9 on the outer wall of the hollow filter ring 4 slides along the axial direction of the guide rod 7 through the guide block 8, compressing the adjusting spring 10 to generate reciprocating vibration. This mechanical shaking effect causes the sand particles attached to the surface of the filter screen to continuously fall off to the edge collection area. Multiple sets of plug strips 11 are fixedly provided on the outer walls of the mounting ring 3. Multiple sets of plug grooves 12 are opened on the inner walls of the fixing ring 2. The plug strips 11 and the plug grooves 12 are slidably connected. The mounting ring 3 forms an axial position through the plug strips 11 on the outer wall and the plug grooves 12 on the inner wall of the fixing ring 2, thereby achieving the effect of convenient disassembly and assembly.

[0027] Please see Figure 2 and Figure 6 Two sets of sliding grooves 13 are symmetrically provided at the upper end of the fixed ring 2. A sliding rod 14 is fixedly installed inside the sliding groove 13. A sliding shell 15 is slidably installed inside the sliding groove 13. When maintenance is required, the sliding shell 15 is snapped from the top outwards, and the sliding shell 15 can slide smoothly along the sliding rod 14 and the sliding groove 13. The rear end of the sliding shell 15 is slidably connected to the side wall of the sliding rod 14. A limit ring 16 is fixedly provided at the front end of the sliding rod 14. The limit ring 16 is located inside the sliding shell 15, and the sliding shell 15 can slide smoothly along the sliding rod 14 and the sliding groove 13.

[0028] Please see Figure 4 and Figure 6 The sliding shell 15 is equipped with a locking spring 17 inside. One end of the locking spring 17 is fixedly connected to the inner wall of the sliding shell 15, and the other end of the locking spring 17 is fixedly connected to the inner wall of the limiting ring 16. When the sliding shell 15 slides, it can compress and deform the internal locking spring 17 to prepare for the subsequent reset movement. The upper inner wall of the plug bar 11 is provided with a locking hole 18. The front side wall of the sliding shell 15 is fixedly provided with a locking rod 19. The front end of the locking rod 19 is engaged with the inner wall of the locking hole 18. The locking rod 19 in the slide groove 13 automatically engages with the locking hole 18 at the end of the plug bar 11 under the action of the locking spring 17, forming a radial constraint.

[0029] When mechanical packers are used in complex working environments with limited space and demanding continuous operation requirements, sand-containing liquids entering the packer first flow through the double-layer hollow filter rings 4 embedded in the fixed ring 2. Each hollow filter ring 4 contains a symmetrically arranged frustum-shaped filter screen 5. Its conical curved surface design allows sand and gravel to slide automatically down the inclined surface to the top edge of the hollow filter ring 4 after being intercepted, avoiding the problem of sand accumulation that is easily caused by traditional flat filter screens. After the liquid is initially filtered by the upper frustum-shaped filter screen 5, it enters the buffer cavity between the double filter screens and then undergoes secondary fine filtration through the lower frustum-shaped filter screen 5, forming a double filtration barrier. Combined with the densely distributed filter channels on the filter screen surface, it can intercept sand and gravel of different particle sizes. Its anti-blocking mechanism is reflected in the dynamic adjustment system.

[0030] When the upper filter screen is impacted by fluid, the guide plate 9 on the outer wall of the hollow filter ring 4 slides along the guide rod 7 axially through the guide block 8, compressing the adjusting spring 10 to generate reciprocating vibration. This mechanical shaking effect causes the sand particles attached to the filter screen surface to continuously fall off to the edge collection area. The four sets of circumferentially distributed guide rods 7 and spring assembly form a three-dimensional vibration matrix to ensure that each area of ​​the filter screen is evenly stressed. Combined with the sand and gravel sliding path guided by the frustum structure, the core problem of easy clogging of traditional fixed filter screens is completely solved.

[0031] During this process, since the size of the guide plate 9 is larger than the size of the guide groove 6, it can also shield the guide groove 6 while vibrating, preventing sand and gravel from entering the interior of the guide groove 6, thereby preventing it from affecting the normal operation of the vibration mechanism.

[0032] The quick-change system adopts a tenon and mortise locking structure. The mounting ring 3 is axially positioned by the outer wall insert strip 11 and the inner wall insert groove 12 of the fixing ring 2. The locking rod 19 in the slide groove 13 automatically engages with the locking hole 18 at the end of the insert strip 11 under the action of the locking spring 17, forming a radial constraint.

[0033] When maintenance is required, the sliding shell 15 is pulled outward from the top, which will cause the locking rod 19 to disengage from the locking hole 18, thus unlocking the connector 11. The entire mounting ring 3 and filter structure can then be pulled out axially. The whole process can be completed without tools. The symmetrical arrangement of the double sliding shells 15 conforms to ergonomics and ensures that it can be easily disassembled and assembled even under harsh working conditions.

[0034] In summary, this device, through triple innovations of hydrodynamically optimized structure, mechanical vibration self-cleaning system, and quick replacement mechanism, extends filter life and improves maintenance efficiency while ensuring filtration accuracy. It is particularly suitable for complex working environments with limited space and demanding continuous operation requirements, such as offshore platforms and shale gas wells.

[0035] Through the above steps, when the mechanical packer is used in complex working conditions with limited space and demanding continuous operation requirements, when sand-containing liquid enters the packer, it first flows through the double-layer hollow filter ring 4 embedded in the fixed ring 2. Each hollow filter ring 4 contains a symmetrically arranged frustum-shaped filter screen 5. Its conical curved surface design allows sand and gravel to automatically slide down the inclined surface to the top edge of the hollow filter ring 4 after being intercepted, avoiding the sand accumulation problem easily caused by traditional flat filter screens. After the liquid is initially filtered by the upper frustum-shaped filter screen 5, it enters the buffer cavity between the double filter screens, and then undergoes secondary fine filtration through the lower frustum-shaped filter screen 5, forming a double filtration barrier. Combined with the densely distributed filter channels on the filter screen surface, it can intercept sand and gravel of different particle sizes. Its anti-jamming mechanism is reflected in the dynamic adjustment system. When the upper frustum-shaped filter screen 5 is impacted by the fluid, the guide plate 9 on the outer wall of the hollow filter ring 4 slides axially along the guide rod 7 through the guide block 8, compressing the adjustment spring. Spring 10 generates reciprocating vibration. This mechanical vibration effect causes sand particles attached to the filter screen surface to continuously fall off to the edge collection area. Four sets of circumferentially distributed guide rods 7 and adjusting springs 10 form a three-dimensional vibration matrix, ensuring that each area of ​​the filter screen is evenly stressed. Combined with the sand and gravel sliding path guided by the frustum structure, this completely solves the core problem of easy clogging of traditional fixed filters. During this process, since the size of the guide plate 9 is larger than that of the guide groove 6, it can also block the guide groove 6 while vibrating, preventing sand and gravel from entering the interior of the guide groove 6, thereby preventing it from affecting the normal operation of the vibration mechanism. In summary, this device, through the triple innovation of fluid dynamics optimized structure, mechanical vibration self-cleaning system and quick replacement mechanism, extends the service life of the filter screen and improves maintenance efficiency while ensuring filtration accuracy. It is particularly suitable for complex working environments with limited space and demanding continuous operation requirements, such as offshore platforms and shale gas wells.

[0036] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A mechanical packer for preventing sand burial and jamming, comprising a packer body (1), characterized in that: It also includes a fixing ring (2), a mounting ring (3), a hollow filter ring (4), a frustum-shaped filter screen (5), a guide groove (6), a guide rod (7), a guide block (8), a guide plate (9), and an adjusting spring (10). The upper inner wall of the packer body (1) is fixedly provided with a fixing ring (2). The mounting ring (3) is slidably provided inside the fixing ring (2). Two sets of hollow filter rings (4) are slidably provided inside the mounting ring (3). Two sets of frustum-shaped filter screens (5) are fixedly provided inside the hollow filter ring (4). Multiple sets of guide grooves (6) are opened around the inner wall of the fixing ring (2). A guide rod (7) is fixedly provided inside the guide groove (6). A guide block (8) is provided on the side wall of the guide rod (7). Multiple sets of guide plates (9) are fixedly provided around the outer wall of the hollow filter ring (4). Two sets of adjusting springs (10) are symmetrically provided on the upper and lower sides of the guide block (8).

2. The mechanical packer for preventing sand burial and jamming according to claim 1, characterized in that: The inner wall of the guide plate (9) is fixedly connected to the side wall of the guide block (8), the guide block (8) is slidably connected to the guide rod (7), one end of the adjusting spring (10) is fixedly connected to the inner wall of the guide block (8), the other end of the adjusting spring (10) is fixedly connected to the inner wall of the guide groove (6), and the adjusting spring (10) is located outside the guide rod (7).

3. The mechanical packer for preventing sand burial and jamming according to claim 1, characterized in that: The outer walls of the mounting ring (3) are fixedly provided with multiple sets of plug strips (11), and the inner walls of the fixing ring (2) are provided with multiple sets of plug grooves (12). The plug strips (11) and the plug grooves (12) are slidably connected.

4. A mechanical packer for preventing sand burial and jamming according to claim 3, characterized in that: Two sets of sliding grooves (13) are symmetrically provided at the upper end of the fixed ring (2). A sliding rod (14) is fixedly installed inside the sliding groove (13), and a sliding shell (15) is slidably installed inside the sliding groove (13).

5. A mechanical packer for preventing sand burial and jamming according to claim 4, characterized in that: The rear end of the sliding shell (15) is slidably connected to the side wall of the sliding rod (14), and a limiting ring (16) is fixedly provided at the front end of the sliding rod (14). The limiting ring (16) is located inside the sliding shell (15).

6. A mechanical packer for preventing sand burial and jamming according to claim 5, characterized in that: A locking spring (17) is provided inside the sliding shell (15). One end of the locking spring (17) is fixedly connected to the inner wall of the sliding shell (15), and the other end of the locking spring (17) is fixedly connected to the inner wall of the limiting ring (16).

7. A mechanical packer for preventing sand burial and jamming according to claim 4, characterized in that: The upper inner wall of the connector (11) is provided with a locking hole (18), and the front side wall of the sliding shell (15) is fixedly provided with a locking rod (19), and the front end of the locking rod (19) is engaged with the inner wall of the locking hole (18).

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