A compression packer for oil production

Abstract

This utility model belongs to the field of compression packers, specifically a compression packer for oil extraction, including a central tube. At the bottom of the central tube are sequentially arranged a sealing assembly, a clamping assembly, a reversing assembly, and a centralizing assembly. The sealing assembly includes a pair of rubber sleeves, with a connecting ring fixedly connected between them. The clamping assembly includes multiple slips, sleeves, and a support ring. The slips and support ring are slidably connected. The slips and sleeves are also slidably connected. The reversing assembly includes a centralizer. A guide rail is provided on the surface of the centralizer. By providing an elastic sheet, the elastic sheet can replace the centralizer block in contact with the casing, reducing wear on the surface of the centralizer block. Since the elastic sheet and the centralizer block are bolted together, the elastic sheet is also easy to replace.

Description

Technical Field

[0001] This utility model relates to the field of compression packers, specifically a compression packer for oil extraction. Background Technology

[0002] Compression packers are commonly used tools in downhole operations. The main packing element is a rubber tube. By compressing the packer with axial force, the outer diameter of the packer is increased to achieve a seal, separating the upper and lower oil layers to achieve construction purposes such as stratified oil testing, oil production, water blocking, water shut-off, and acidizing.

[0003] In the existing technology, compression packers are generally positioned inside the casing by using a centralizing block. During use and observation, it has been found that the centralizing block is usually in direct contact with the inner wall of the casing. When the water content inside the casing increases, it will cause increased wear between the centralizing block and the casing, which will require the replacement of the centralizing block. However, the main body of the centralizing block is usually hidden inside the packer, making its replacement operation inconvenient.

[0004] Therefore, a compression packer for oil extraction is proposed to address the above problems. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: A compression packer for oil extraction, comprising a central tube, with a sealing assembly, a clamping assembly, a reversing assembly, and a centralizing assembly sequentially arranged at the bottom of the central tube; the sealing assembly includes a pair of rubber sleeves, with a connecting ring fixedly connected between the pair of rubber sleeves; the clamping assembly includes multiple slips, sleeves, and a support ring; the slips and support ring are slidably connected; the slips and sleeves are also slidably connected; the reversing assembly includes a centralizer; a guide rail is provided on the surface of the centralizer; a pin is provided on the outer wall of the central tube, and the pin and guide rail are slidably engaged; the centralizing assembly includes a centralizing block; the centralizing blocks are evenly distributed on the surface of the centralizer and are fixedly connected to the centralizer; an elastic sheet is fixedly connected to the outer wall of the centralizer by bolts; by providing the elastic sheet, the elastic sheet can replace the centralizer block in contact with the casing, thereby reducing wear on the surface of the centralizer block; and since the elastic sheet and the centralizer block are bolted together, the elastic sheet is also easy to replace.

[0007] Preferably, a rubber layer is fixed to the outer wall of the elastic sheet, and the rubber layer is flexibly configured. By providing the rubber layer, the rubber layer has a high surface smoothness, and when it slides relative to the sleeve, the friction environment is wet friction due to the presence of fluid in the pipe, which can effectively reduce the friction between the elastic sheet and the sleeve and extend the service life of the elastic sheet.

[0008] Preferably, a plurality of thermosensitive metals are fixedly embedded in the inner wall of the elastic sheet; the thermosensitive metals are equidistantly arranged and located between the elastic sheet and the centralizing block; by setting the thermosensitive metals, since the temperature downhole is generally high, and the thermosensitive metals are relatively sensitive to temperature, they will expand in the high-temperature environment to compensate for the wear caused by friction on the surface of the elastic sheet. Specifically, the surface of the elastic sheet is squeezed to ensure that the elastic sheet can fit tightly against the inner wall of the casing.

[0009] Preferably, the outer wall of the rubber tube is fixed with multiple reinforcing ribs; the reinforcing ribs are arranged at equal intervals; by setting the reinforcing ribs, the reinforcing ribs can be specifically spring steel wires, so as to improve the structural strength of the rubber tube surface, so that the rubber tube can better resist tearing under compression and tension, thereby extending the service life of the rubber tube.

[0010] Preferably, the outer wall of the pair of rubber tubes is provided with a heat insulation layer; the heat insulation layer is elastically configured; by providing the heat insulation layer, the heat insulation layer can isolate the pair of rubber tubes from heat conduction inside the tube, thereby reducing the decrease in internal stress and elastic modulus of the rubber tubes due to temperature rise, and extending the service life of the rubber tubes.

[0011] Preferably, multiple deoxidation boxes are fixed to the outer wall of the connecting ring; the deoxidation boxes are arranged in a circumferential array; by setting up deoxidation boxes, deoxidizing agents are stored in the deoxidation boxes, which can absorb oxygen in the environment around the rubber tube, thereby reducing the thermo-oxidative reaction that occurs in the rubber tube under high temperature environment, slowing down the aging of the rubber tube material, and further extending the service life of the rubber tube.

[0012] The advantages of this utility model are:

[0013] 1. The compression packer for oil extraction described in this utility model has an elastic sheet that can replace the centralizing block in contact with the casing, thereby reducing wear on the surface of the centralizing block. Since the elastic sheet and the centralizing block are connected by bolts, the elastic sheet is also easy to replace.

[0014] 2. The compression packer for oil extraction described in this utility model, by setting a rubber layer, has a high surface smoothness, and the friction environment is wet friction due to the presence of fluid in the pipeline when it slides relative to the casing, which can effectively reduce the friction between the elastic sheet and the casing and extend the service life of the elastic sheet. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the main body of this utility model;

[0017] Figure 2 This is a schematic diagram of the sleeve structure in this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the rubber tube in this utility model;

[0019] Figure 4 This is a schematic diagram of the straightening block in this utility model;

[0020] Figure 5 This is a schematic diagram of the reinforcing rib in this utility model.

[0021] In the diagram: 1. Central tube; 12. Slipper; 13. Sleeve; 14. Support ring; 15. Centralizer; 16. Centralizer block; 17. Guide rail; 18. Rubber sleeve; 19. Elastic sheet; 110. Connecting ring; 2. Rubber layer; 3. Thermosensitive metal; 4. Reinforcing rib; 5. Insulation layer; 6. Deoxidation box. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] Specific implementation examples are given below.

[0024] Please see Figures 1 to 5As shown in the embodiment of this utility model, a compression packer for oil extraction includes a central tube 1. The bottom of the central tube 1 is sequentially provided with a sealing assembly, a clamping assembly, a reversing assembly, and a centralizing assembly. The sealing assembly includes a pair of rubber sleeves 18, with a connecting ring 110 fixedly connected between the pair of rubber sleeves 18. The clamping assembly includes multiple slips 12, sleeves 13, and support rings 14. The slips 12 and support rings 14 are slidably connected. The slips 12 and sleeves 13 are also slidably connected. The reversing assembly includes a centralizer 15. The centralizer 15 has a guide rail 17 on its surface; the outer wall of the central tube 1 has a pin, and the pin and the guide rail 17 are in sliding fit; the centralizing assembly includes a centralizing block 16; the centralizing block 16 is evenly distributed on the surface of the centralizer 15 and is fixedly connected to the centralizer 15; the outer wall of the centralizing block 16 is fixedly connected to an elastic sheet 19 by bolts; during operation, the central tube 1 can be connected to the tubing string, and the central tube 1 can be lowered into the casing along with the tubing string. When lowering into the well, the pin on the outer wall of the central tube 1 is located at the dead point of the guide rail 17. After reaching the designated position, the central tube is lifted and rotated. The column drives the central tube 1, along with the pin, to slide out from the dead point of the guide rail 17 and into another rail. The column continues to descend, allowing the central tube 1 to move down along with the sleeve 13. The slip 12 has an inclined groove on its outer wall that engages with the protruding teeth on the inner wall of the sleeve 13. This allows the slip 12 to move outward along the support ring 14 and open up under the action of the protruding teeth and grooves as the sleeve 13 descends, thus locking the sleeve wall. As the central tube 1 continues to descend, it applies pressure to a pair of rubber sleeves 18, compressing them and sealing the inside of the sleeve. This completes the process. The above-mentioned structural connections and working principles are all mature existing technologies, so they will not be described in detail here. When the packer moves with the tubing inside the casing, the assembly consisting of the centralizing block 16 and the elastic sheet 19 will be in close contact with the inner wall of the casing and ensure that the packer is in the center position inside the casing. Since the elastic sheet 19 is located outside the centralizing block 16, the elastic sheet 19 can directly contact the inner wall of the casing to reduce the direct contact between the centralizing block 16 and the casing. At the same time, since the elastic sheet 19 and the centralizing block 16 are bolted together, the elastic sheet 19 is also easy to replace.

[0025] Please see Figure 4 As shown, a rubber layer 2 is fixed to the outer wall of the elastic sheet 19, and the rubber layer 2 is flexibly configured. By setting the rubber layer 2, the rubber layer 2 has a high surface smoothness, and when it slides relative to the sleeve, the friction environment is wet friction due to the presence of fluid in the pipe, which can effectively reduce the friction between the elastic sheet 19 and the sleeve and extend the service life of the elastic sheet 19.

[0026] Please see Figure 4As shown, multiple thermosensitive metals 3 are fixedly embedded in the inner wall of the elastic sheet 19; the thermosensitive metals 3 are equidistantly arranged and located between the elastic sheet 19 and the centralizing block 16; by setting the thermosensitive metals 3, since the temperature downhole is generally high, and the thermosensitive metals 3 are more sensitive to temperature, they will expand in the high temperature environment to compensate for the wear caused by friction on the surface of the elastic sheet 19. Specifically, the surface of the elastic sheet 19 is squeezed to ensure that the elastic sheet 19 can fit tightly against the inner wall of the casing.

[0027] Please see Figure 5 As shown, a plurality of reinforcing ribs 4 are fixed to the outer wall of the rubber tube 18; the reinforcing ribs 4 are arranged at equal intervals; by setting the reinforcing ribs 4, the reinforcing ribs 4 can be specifically spring steel wires, so as to improve the structural strength of the surface of the rubber tube 18, so that the rubber tube 18 can better resist tearing under compression and tension, thereby extending the service life of the rubber tube 18.

[0028] Please see Figure 5 As shown, the outer wall of the pair of rubber cylinders 18 is provided with a heat insulation layer 5; the heat insulation layer 5 is elastically configured; by providing the heat insulation layer 5, the heat insulation layer 5 can isolate the heat conduction inside the tube for the pair of rubber cylinders 18, thereby reducing the decrease in internal stress and elastic modulus of the rubber cylinders 18 due to the increase in temperature, and extending the service life of the rubber cylinders 18.

[0029] Please see Figure 5 As shown, multiple deoxidation boxes 6 are fixed to the outer wall of the connecting ring 110; the deoxidation boxes 6 are arranged in a circumferential array; by setting the deoxidation boxes 6, the deoxidation boxes 6 store deoxidizing agents, which can absorb oxygen in the environment around the rubber sleeve 18, thereby reducing the thermo-oxidative reaction that occurs in the rubber sleeve 18 under high temperature environment, slowing down the aging of the rubber sleeve 18 material, and further extending the service life of the rubber sleeve 18.

[0030] Working principle: The central tube 1 is connected to the tubing string. The central tube 1, along with the tubing string, can be lowered into the casing. During lowering, the pin on the outer wall of the central tube 1 is located at the dead point of the guide rail 17. After reaching the designated position, the tubing string is lifted and rotated forward, driving the central tube 1, along with the pin, to slide out from the dead point of the guide rail 17 and onto another rail. Then, the tubing string continues to be lowered, allowing the central tube 1 to move down with the casing 13. The outer wall of the slip 12 is provided with an inclined groove that engages with the protruding teeth on the inner wall of the casing 13. This allows the slip 12 to move outward along the support ring 14 and open up under the action of the protruding teeth and grooves when the casing 13 moves down, thus locking the casing wall. As the central tube 1 continues to move down, the central tube 1 can engage with a pair of rubber... Pressure is applied to the cylinder 18, causing it to compress and seal the casing, thus completing the setting. The structural connections and working principles described above are mature existing technologies and will not be elaborated further here. As the packer moves within the casing along with the tubing, the assembly consisting of the centralizing block 16 and the elastic sheet 19 adheres tightly to the inner wall of the casing, ensuring the packer is centered within the cylinder. Because the elastic sheet 19 is located outside the centralizing block 16, it can directly contact the inner wall of the casing, reducing direct contact between the centralizing block 16 and the casing. Furthermore, since the elastic sheet 19 and the centralizing block 16 are bolted together, the elastic sheet 19 can also... For easy replacement; by setting a rubber layer 2, the rubber layer 2, due to its high surface smoothness, and because the friction environment is wet friction due to the fluid in the pipe when sliding relative to the casing, can effectively reduce the friction between the elastic sheet 19 and the casing, and extend the service life of the elastic sheet 19; by setting a thermosensitive metal 3, since the temperature downhole is generally high, and the thermosensitive metal 3 is highly sensitive to temperature, it will expand in the high temperature environment, compensating for the wear of the surface of the elastic sheet 19 caused by friction, specifically by squeezing the surface of the elastic sheet 19 to ensure that the elastic sheet 19 can fit tightly against the inner wall of the casing; by setting a reinforcing rib 4, the reinforcing rib 4 can be spring steel. The rubber sleeve 18 is reinforced with filaments to improve its structural strength, enabling it to better resist tearing under compression and tension, thereby extending its service life. The insulation layer 5 isolates the rubber sleeve 18 from heat conduction, reducing internal stress and elastic modulus caused by temperature increases, further extending its service life. The deoxidizing box 6, containing a deoxidizing agent, absorbs oxygen from the surrounding environment, reducing the thermo-oxidative reaction at high temperatures, slowing material aging, and further extending its service life.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A compression packer for oil extraction, comprising a central tube (1), wherein a sealing assembly, a clamping assembly, a reversing assembly, and a straightening assembly are sequentially arranged at the bottom of the central tube (1); characterized in that: The sealing assembly includes a pair of rubber tubes (18), and a connecting ring (110) is fixedly connected between the pair of rubber tubes (18); The clamping assembly includes multiple clamps (12), sleeves (13), and support rings (14); the clamps (12) and support rings (14) are slidably connected; the clamps (12) and sleeves (13) are also slidably connected. The reversing assembly includes a stabilizer (15); the stabilizer (15) has a guide rail (17) on its surface; the outer wall of the central tube (1) is provided with a pin, and the pin and the guide rail (17) are in sliding fit; The straightening component includes straightening blocks (16); the straightening blocks (16) are evenly distributed on the surface of the straightener (15) and are fixedly connected to the straightener (15); The outer wall of the straightening block (16) is fixedly connected with an elastic sheet (19) by bolts.

2. The compression packer for oil extraction according to claim 1, characterized in that: The elastic sheet (19) has a rubber layer (2) fixed to its outer wall, and the rubber layer (2) is flexibly configured.

3. A compression packer for oil extraction according to claim 2, characterized in that: The inner wall of the elastic sheet (19) is fixedly embedded with a plurality of thermosensitive metals (3); the thermosensitive metals (3) are arranged at equal intervals and are located between the elastic sheet (19) and the straightening block (16).

4. A compression packer for oil extraction according to claim 3, characterized in that: The outer wall of the rubber tube (18) is fixed with a plurality of reinforcing ribs (4); the reinforcing ribs (4) are arranged at equal intervals.

5. A compression packer for oil extraction according to claim 4, characterized in that: The outer wall of the pair of rubber tubes (18) is provided with a heat insulation layer (5); the heat insulation layer (5) is elastically arranged.

6. A compression packer for oil extraction according to claim 5, characterized in that: Multiple deoxygenation boxes (6) are fixed to the outer wall of the connecting ring (110); the deoxygenation boxes (6) are arranged in a circumferential array.

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