Packer leather cup and rubber sleeve and packer

Abstract

The utility model discloses a packer packing cup rubber sleeve and a packer, and relates to the technical field of oil field equipment, the packer comprises the packing cup rubber sleeve, the packing cup rubber sleeve comprises a rubber sleeve with the upper end diameter larger than the lower end diameter, the packing cup rubber sleeve further comprises a framework embedded in the side wall of the rubber sleeve, the framework is of a laminated structure, and the rubber sleeve and the framework are arranged in the rubber sleeve. The number of layers of the framework is larger than or equal to 2, and the layers forming the framework are stacked in the radial direction of the rubber cylinder. The structural design adopted by the slip rubber sleeve in the scheme has the characteristic that the slip rubber sleeve can be conveniently subjected to casing milling.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field equipment, in particular to a packer leather cup rubber cylinder and a packer. Background Art

[0002] The packer is a downhole tool used in oil fields in the field of oil production. The packer with a leather cup rubber cylinder includes the Z231 packer. As a specific application, the packer is connected to the sealing tool when in use. The specific method of use is to lower the packer into the casing to the specified position, lift the tubing, move the center pipe upward, and the track pin enters the reversing mechanism from the short track, lower the tubing, and the track pin enters the long track from the reversing mechanism to achieve track conversion. Then, slowly lower the tubing, the top sleeve on the straightening body enters the anchoring body, and the cover ring of the locking ball is opened to unlock the locking ball; continue to lower the tubing, the cone moves down, the slip is expanded and stuck on the casing to achieve anchoring; lower the tubing again, and use the slip as the supporting force point to compress the leather cup rubber cylinder to expand it, so as to achieve the sealing of the side annular space of the leather cup rubber cylinder. As another specific application, when in use, the leather cup rubber cylinder has an interference fit with the inner wall of the casing under its own elasticity or liquid pressure to achieve sealing of the side annulus. When unsealing the packer, possible solutions include lifting the tubing string, the center pipe drives the rubber cup and cone to move upward, the rubber cup and slips are retracted, and the rubber cup is automatically unsealed after the pressure difference is restored.

[0003] Regarding the structural design of the leather cup rubber cylinder, in order to make it have sufficient strength and stability when bearing loads, the prior art includes a leather cup rubber cylinder solution with a skeleton, specifically: the skeleton is set on the inside or outer wall of the leather cup rubber cylinder, and related applications include the technical solution provided by the prior art with patent application number CN200920092367.5.

[0004] In order to solve the problem that the packer may not be released normally during use, there are packer milling tools and packers that can be milled in the prior art. Specific technical solutions include the technical solutions provided by patent applications No. CN 200420030728.0 and CN201921919231.7 and the technical solution provided by patent application No. CN201420038614.4. The implementation of these technologies can realize the release and unblocking of the packer by later milling, and at the same time has the characteristics of shortening the milling time and greatly improving the efficiency of deep well and complex well drilling and production development operations.

[0005] In view of the problem that the packer cannot be released normally, it is necessary to further optimize the structure of the packer. Utility Model Content

[0006] In order to further optimize the packer structure, the utility model provides a packer rubber cup and a packer. The packer includes the slip rubber tube, and the slip rubber tube is designed to facilitate milling.

[0007] In view of the above problems, the utility model provides a packer leather cup rubber cylinder and a packer to solve the problems through the following technical points: a packer leather cup rubber cylinder, comprising a rubber cylinder with an upper end diameter greater than a lower end diameter, and also comprising a skeleton embedded in the side wall of the rubber cylinder, wherein the skeleton is a laminated structure, the number of skeleton layers is greater than or equal to 2, and the layers forming the skeleton are stacked along the radial direction of the rubber cylinder.

[0008] In the prior art, the rubber cup on the packer is used as a sealing component to achieve sealing on the packer. When the outer periphery of the rubber cup is squeezed against the wall of the sleeve, sealing is achieved. The skeleton is used as a rigid frame inside the rubber cup to ensure the strength and stability of the rubber cup. At the same time, the skeleton embedded in the rubber cup is usually arranged on one side of the rubber cup close to the outside of the rubber cup, and has a longer length in the axial direction of the rubber cup. Therefore, the skeleton is close to the inner wall of the sleeve on the stretched rubber cup. When the milling process is implemented to mill the packer that cannot be unsealed normally, the skeleton affects the smooth implementation of the milling.

[0009] In the above scheme, by setting the skeleton as a laminated structure and stacking the layers along the radial direction of the rubber tube, the laminated structure enables the skeleton as a whole to have the required supporting capacity and stability. At the same time, compared with the skeleton with an integral structure, since the thickness of a single layer of the skeleton is thinner and there is no adhesion between layers, the debris generated by the milling tube in the process of milling the skeleton is more easily detached from the skeleton. Therefore, when the milling process is adopted to implement the packer unblocking operation, the skeleton with a laminated structure is beneficial to reduce the difficulty of milling the leather cup rubber tube and improve the milling efficiency, thereby facilitating the smooth implementation of the milling operation.

[0010] In a specific embodiment, each layer of the skeleton is an aluminum alloy sheet. In the prior art, the skeleton mostly uses an integral spring steel sheet. When the packer cannot be lifted up normally to release the seal and the milling process is used to achieve the release and unblocking, since spring steel is a material that is not easy to be drilled and milled, this solution is to further optimize the milling performance of the leather cup rubber cylinder, and each layer of the skeleton is set to an aluminum alloy material. The above aluminum alloy sheets have certain elastic properties and are also a material that is easy to be milled. Therefore, the skeleton layer structure of aluminum alloy sheets is beneficial to the efficient implementation of the leather cup rubber cylinder.

[0011] In a specific embodiment, there are multiple skeletons, and the skeletons are evenly distributed in an annular pattern relative to the center line of the rubber tube. In this solution, the skeletons evenly distributed in an annular pattern relative to the center line of the rubber tube are used to enable each position of the rubber tube in the circumferential direction to be evenly supported by the skeletons, which is beneficial to maintaining the deformation consistency of each position in the circumferential direction of the rubber cup rubber tube, so that the rubber cup rubber tube has a reliable sealing effect on the peripheral annulus.

[0012] In a specific embodiment, the lower ends of each layer of the skeleton are located at the bottom of the rubber tube;

[0013] In the radial direction of the rubber tube, the relationship between any two layers in the laminated structure is: the top of the layer on the outside is located above the top of the layer on the inside. This solution provides a form of arrangement of the skeleton in the rubber tube: the rubber tube is generally fixed to the central tube of the packer through its bottom side, and the position of the lower ends of each layer of the skeleton can enable the bottom side of the skeleton to be well supported by the central tube; in the laminated structure, the top of the layer on the outside is located above the top of the layer on the inside, so that in the length direction of the skeleton, the skeleton at the upper end is thinner and the skeleton at the lower end is thicker. When the leather cup rubber tube is stretched, the deformation position of the skeleton will not be concentrated on the bottom side of the skeleton. Therefore, this solution is conducive to increasing the contact area between the rubber tube and the casing. At the same time, each layer of the skeleton can be set to have the same thickness at each position in the length direction, which is convenient for skeleton preparation.

[0014] In a specific embodiment, the skeleton adopts a double-layer structure, and a bend with a recessed side located on the inner side of the layer is provided on the outer layer of the skeleton, and the position of the bend is adapted to the deformation position of the rubber tube. Specifically, the rubber tube includes a tapered section, an equal-diameter section and a tapered section from bottom to top, and the two tapered sections are both tapered tube structures in which the outer diameter of the upper side is greater than the outer diameter of the lower side. The positions where the two tapered sections are connected to the equal-diameter section are both variable diameter positions on the rubber tube, and the inner side of each variable diameter position has a bend located on the layer. Such a leather cup rubber tube structure is a specific solution that can ensure the contact area between the rubber tube and the sleeve.

[0015] In a specific embodiment, the lower ends of the various layers of the skeleton are all bent in an arc shape and extend toward the center of the rubber tube. In this solution, when the rubber tube of the cup is squeezed and deformed, the arc shape is used to avoid concentrated force at the lower end of the skeleton.

[0016] In a specific embodiment, it further comprises a support tube, wherein the upper end of the support tube has a tapered hole, and the maximum diameter position of the tapered hole is located at the upper end of the support tube;

[0017] The lower end of the rubber tube is a conical structure whose shape is adapted to the shape of the conical hole, and the adaptation is: after the lower end of the rubber tube is inserted into the conical hole, the conical structure and the conical hole are interference fit;

[0018] The rubber tube is inserted into the tapered hole of the support tube by its lower end to form a plug-in connection with the support tube. In the plug-in connection state, the lower ends of each layer of the skeleton are located on the inner side of the support tube, and the upper ends of each layer of the skeleton are located on the outside of the support tube. In this solution, the support tube can be a cone on the packer, and the tapered hole is the upper hole section of the center hole of the cone. When the lower end of the rubber tube is inserted into the tapered hole, the lower end of the skeleton is clamped between the support tube and the center tube. This not only facilitates the fixation of the leather cup rubber tube on the packer, but also enables the lower end of the skeleton to be reliably constrained. The above interference fit relationship is used to optimize the sealing of the corresponding mating surfaces.

[0019] In a specific embodiment, the bottom side of the rubber tube is also inlaid with a connecting seat that is annular and coaxial with the rubber tube, and the center hole of the connecting seat serves as a component of the center hole on the bottom side of the leather cup rubber tube. This scheme is: the connection seat is the surface layer on the inner side of the lower end of the rubber cup rubber tube. When it is used, the center tube of the packer passes through the center hole of the connection seat. The position of the rubber cup rubber tube in the radial direction of the center tube is limited by the contact between the center hole of the connection seat and the center tube. The position of the rubber cup rubber tube on the axis of the center tube is limited by the constraint of the upper end of the support tube on the lower end of the connection seat and the constraint of the center tube on the upper end of the connection seat. In this way, the connection seat can be used as a pressure-bearing part that bears the axial force at the lower end of the rubber tube. Specifically, if the connection seat is set as a cylindrical structure of metal material or a cylindrical structure of composite material, under the same axial force, since the connection seat produces less deformation than the rubber material, the rubber tube with the connection seat at the lower end produces less axial deformation under the corresponding axial force, and the coaxiality of the rubber cup rubber tube and the center tube is maintained by the direct contact between the wall of the center hole of the connection seat and the wall of the center tube. Therefore, this scheme is beneficial to the position stability and accuracy of the rubber cup rubber tube in the axial and radial directions of the packer. It is preferred that the material of the connection seat is a fiber-reinforced epoxy resin composite material with outstanding mechanical properties and suitable for the use environment of the packer.

[0020] In a specific embodiment, a latching protrusion and a latching groove are provided on the inner side of the bottom side of the rubber tube and the outer side of the connecting seat. The latching protrusion of the rubber tube is embedded in the latching groove of the connecting seat, and the latching protrusion of the connecting seat is embedded in the latching groove of the rubber tube. The latching grooves on the rubber tube and the connecting seat include a first latching groove with an opening end facing the axial direction of the rubber tube and a second latching groove with an opening end facing the radial direction of the rubber tube. Such a structural form can ensure the reliability of the connection between the connecting seat and the rubber tube.

[0021] In a specific embodiment, for the convenience of preparation, the locking projection and the locking groove are both annular structures, and the axis thereof is colinear with the axis of the rubber tube.

[0022] In a specific embodiment, the projection of the lower end of each layer of the skeleton toward the axis of the rubber tube falls on the side of the connecting seat. Since the connecting seat is embedded in the rubber tube, in this solution, by setting the lower end of each layer of the skeleton to be located outside the connecting seat and within the height range of the connecting seat on the packer, the lower end of each layer of the skeleton can have a relatively stable position during the deformation of the rubber tube and cannot puncture the rubber tube. Therefore, this structural form is beneficial to the performance stability and reliability of the rubber tube.

[0023] In a specific embodiment, the lower end faces of each layer of the frame are in contact with the side faces of the connection seat, and the inner side faces of the frame are in contact with the side faces of the connection seat. Based on the above solutions, this solution provides a technical solution that uses the connection seat to provide direct support for the frame.

[0024] The present solution discloses a packer including a packer leather cup rubber cylinder as described in any one of the above items, and the packer is a packer whose upper leather cup rubber cylinder adopts the leather cup rubber cylinder as described above.

[0025] The utility model has the following beneficial effects:

[0026] In the present solution, the packer includes the leather cup rubber tube. In the structural design adopted by the leather cup rubber tube, by setting the skeleton as a laminated structure and stacking the layers along the radial direction of the rubber tube, the laminated structure enables the skeleton as a whole to have the required supporting capacity and stability. At the same time, compared with the skeleton with an integral structure, since the thickness of a single layer of the skeleton is thinner and there is no adhesion between the layers, the debris generated by the milling tube in the process of milling the skeleton is more easily detached from the skeleton. Therefore, when the milling process is adopted to implement the packer unblocking operation, the skeleton with a laminated structure is conducive to reducing the difficulty of milling the leather cup rubber tube and improving the milling efficiency, thereby facilitating the smooth implementation of the milling operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a half-section diagram of a specific embodiment of the packer including the leather cup rubber cylinder described in this solution, and the half-section diagram is a half-section diagram of the top position of the packer;

[0028] Figure 2 A half-section diagram of a specific embodiment of the packer including the leather cup rubber cylinder described in this solution, wherein the half-section diagram is a half-section diagram of the top position and the middle position of the packer;

[0029] Figure 3 It is a half-section view of a specific embodiment of the packer including the leather cup rubber cylinder described in this scheme, and the half-section view is a half-section view of the entire length of the packer.

[0030] The reference numerals in the figure are: 1. rubber tube, 2. frame, 3. center tube, 4. support tube, 5. connecting seat. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the embodiments, but the present invention is not limited to the following embodiments:

[0032] Embodiment 1:

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, a packer leather cup rubber cylinder includes a rubber cylinder 1 with an upper end diameter larger than a lower end diameter, and also includes a skeleton 2 embedded in the side wall of the rubber cylinder 1, wherein the skeleton 2 is a laminated structure, and the number of layers of the skeleton 2 is greater than or equal to 2, and the layers forming the skeleton 2 are stacked along the radial direction of the rubber cylinder 1.

[0034] In the prior art, the rubber cup on the packer is used as a sealing component to achieve sealing on the packer. When the outer periphery of the rubber tube 1 is squeezed against the wall of the sleeve, sealing is achieved. The skeleton 2 is used as a rigid frame inside the rubber tube 1 to ensure the strength and stability of the rubber cup. At the same time, the skeleton 2 embedded in the rubber tube 1 is usually arranged on one side of the rubber tube 1 close to the outside of the rubber tube 1. It has a longer length in the axial direction of the rubber tube 1. Therefore, the skeleton 2 on the stretched rubber cup is close to the inner wall of the casing. When the milling process is implemented to mill the packer that cannot be unsealed normally, the skeleton 2 affects the smooth implementation of the milling.

[0035] In the above scheme, by setting the skeleton 2 as a laminated structure and stacking the layers along the radial direction of the rubber tube 1, the laminated structure enables the skeleton 2 as a whole to have the required supporting capacity and stability. At the same time, when the lower end of the milling tube acts on the skeleton 2, compared with the skeleton 2 with an integral structure, since the thickness of the single layer of the skeleton 2 is thinner and there is no adhesion between the layers, the debris generated by the milling tube in the process of milling the skeleton 2 is more easily detached from the skeleton 2. Therefore, when the milling process is adopted to implement the packer unblocking operation, the skeleton 2 with a laminated structure is beneficial to reduce the difficulty of milling the leather cup rubber tube and improve the milling efficiency, thereby facilitating the smooth implementation of the milling operation.

[0036] In a more specific solution, each layer of the skeleton 2 is an aluminum alloy sheet. In the prior art, the skeleton 2 mostly uses an integral spring steel sheet. When the packer cannot be lifted up and unsealed normally and the milling process is used to unseal and unblock, since spring steel is a material that is not easily drilled and milled, this solution is to further optimize the milling performance of the leather cup rubber cylinder, and each layer of the skeleton 2 is set to an aluminum alloy material. The above aluminum alloy sheets have certain elastic properties and are also a material that is easy to be milled. Therefore, the skeleton 2-layer structure of aluminum alloy sheets is beneficial to the efficient implementation of the leather cup rubber cylinder.

[0037] In a more specific solution, there are multiple skeletons 2, and the skeletons 2 are evenly distributed in an annular shape relative to the center line of the rubber tube 1. In this solution, the skeletons 2 evenly distributed in an annular shape relative to the center line of the rubber tube 1 are used to enable each position of the rubber tube 1 in the circumferential direction to be evenly supported by the skeletons 2, which is beneficial to maintaining the deformation consistency of each position in the circumferential direction of the rubber cup rubber tube, so that the rubber cup rubber tube has a reliable sealing effect on the peripheral annulus.

[0038] In a more specific embodiment, the lower ends of the layers of the skeleton 2 are located at the bottom of the rubber tube 1;

[0039] In the radial direction of the rubber tube 1, the relationship between any two layers in the laminated structure is: the top of the layer on the outside is located above the top of the layer on the inside. This solution provides a layout of the skeleton 2 in the rubber tube 1: the rubber tube 1 is generally fixed to the central tube 3 of the packer through its bottom side, and the position of the lower ends of each layer of the skeleton 2 can enable the bottom side of the skeleton 2 to be well supported by the central tube 3; in the laminated structure, the top of the layer on the outside is located above the top of the layer on the inside, so that in the length direction of the skeleton 2, the skeleton 2 at the upper end is thinner and the skeleton 2 at the lower end is thicker. When the leather cup rubber tube is stretched, the deformation position of the skeleton 2 will not be concentrated on the bottom side of the skeleton 2. Therefore, this solution is conducive to increasing the contact area between the rubber tube 1 and the casing. At the same time, each layer of the skeleton 2 can be set to have the same thickness at each position in the length direction, which is convenient for the preparation of the skeleton 2.

[0040] In a more specific scheme, the skeleton 2 adopts a double-layer structure, and a bend with a recessed side located on the inner side of the layer is provided on the outer layer of the skeleton 2, and the position of the bend is adapted to the deformation position of the rubber tube 1. Specifically, the rubber tube 1 includes a conical section, an equal-diameter section and a conical section from bottom to top, and the two conical sections are both conical tube structures in which the upper outer diameter is greater than the lower outer diameter. The positions where the two conical sections are connected to the equal-diameter sections are both variable diameter positions on the rubber tube 1, and the inner side of each variable diameter position has a bend located on the layer. Such a leather cup rubber tube structure is a specific scheme that can ensure the contact area between the rubber tube 1 and the sleeve.

[0041] In a more specific solution, the lower ends of the layers of the skeleton 2 are all bent in an arc shape and extend toward the center of the rubber tube 1. In this solution, when the rubber tube is squeezed and deformed, the arc shape is used to avoid concentrated force at the lower end of the skeleton 2.

[0042] In a more specific solution, it also includes a support tube 4, the upper end of the support tube 4 has a tapered hole, and the maximum diameter position of the tapered hole is located at the upper end of the support tube 4;

[0043] The lower end of the rubber tube 1 is a conical structure whose shape is adapted to the shape of the conical hole. The adaptation is: after the lower end of the rubber tube 1 is inserted into the conical hole, the conical structure and the conical hole are interference fit;

[0044] The rubber tube 1 is inserted into the tapered hole of the support tube 4 by its lower end to form a plug-in connection relationship with the support tube 4. In the plug-in connection state, the lower ends of the layers of the skeleton 2 are located on the inner side of the support tube 4, and the upper ends of the layers of the skeleton 2 are located on the outside of the support tube 4. In this solution, the support tube 4 can be a cone on the packer, and the tapered hole is the upper hole section of the center hole of the cone. When the lower end of the rubber tube 1 is inserted into the tapered hole, the lower end of the skeleton 2 is clamped between the support tube 4 and the center tube 3. This not only facilitates the fixation of the rubber tube on the packer, but also enables the lower end of the skeleton 2 to be reliably constrained. The above interference fit relationship is used to optimize the sealing of the corresponding mating surfaces.

[0045] In a more specific solution, a connecting seat 5 in the shape of an annular ring and coaxial with the rubber tube 1 is embedded on the bottom side of the rubber tube 1 , and the center hole of the connecting seat 5 serves as a component of the center hole on the bottom side of the rubber cup tube. The present scheme is that: the connecting seat 5 serves as the surface layer on the inner side of the lower end of the leather cup rubber tube. When in specific use, the center tube 3 of the packer passes through the center hole of the connecting seat 5. The radial position of the leather cup rubber tube is limited by the contact between the center hole of the connecting seat 5 and the center tube 3. The position of the leather cup rubber tube on the axis of the center tube 3 is limited by the constraint of the upper end of the support tube 4 on the lower end of the connecting seat 5 and the constraint of the center tube 3 on the upper end of the connecting seat 5. In this way, the connecting seat 5 can be used as a pressure-bearing part that bears the axial force at the lower end of the rubber tube 1. Specifically, if the connecting seat 5 is set to a cylindrical structure of a metal material or a cylindrical structure of a composite material, under the same axial force, since the connecting seat 5 produces less deformation than the rubber material, the rubber tube 1 with the connecting seat 5 at the lower end produces less axial deformation under the corresponding axial force, and the coaxiality of the leather cup rubber tube and the center tube 3 is maintained by the direct contact between the wall of the center hole of the connecting seat 5 and the wall of the center tube 3. Therefore, the present scheme is beneficial to the position stability and accuracy of the leather cup rubber tube in the axial and radial directions of the packer. Preferably, the connecting seat 5 is made of a fiber-reinforced epoxy resin composite material with outstanding mechanical properties and suitable for the use environment of the packer.

[0046] In a more specific solution, a cam and a groove are provided on the inner side of the bottom side of the rubber tube 1 and the outer side of the connecting seat 5. The cam of the rubber tube 1 is embedded in the groove of the connecting seat 5, and the cam of the connecting seat 5 is embedded in the groove of the rubber tube. The grooves on the rubber tube 1 and the connecting seat 5 include a first groove with an opening end facing the axial direction of the rubber tube 1 and a second groove with an opening end facing the radial direction of the rubber tube 1. Such a structural form can ensure the reliability of the connection between the connecting seat 5 and the rubber tube 1.

[0047] In a more specific solution, for the convenience of preparation, the cam and the groove are both annular structures, and the axis is colinear with the axis of the rubber tube 1.

[0048] In a more specific solution, the projection of the lower end of each layer of the skeleton 2 toward the axis of the rubber tube 1 falls on the side of the connecting seat 5. Since the connecting seat 5 is embedded in the rubber tube 1, in this solution, by setting the lower end of each layer of the skeleton 2 to be located outside the connecting seat 5 and within the height range of the connecting seat 5 on the packer, the lower end of each layer of the skeleton 2 can have a relatively stable position during the deformation of the rubber tube and cannot puncture the rubber tube 1, so this structural form is beneficial to the performance stability and reliability of the rubber tube.

[0049] In a more specific solution, the lower end faces of each layer of the frame 2 are in contact with the side faces of the connection seat 5, and the inner side faces of the frame 2 are in contact with the side faces of the connection seat 5. Based on the above solution, this solution provides a technical solution that uses the connection seat 5 to provide direct support for the frame 2.

[0050] The present solution discloses a packer including a packer leather cup rubber cylinder as described in any one of the above items, and the packer is a packer whose upper leather cup rubber cylinder adopts the leather cup rubber cylinder as described above.

[0051] In a more specific solution, for the cava assembly on the packer, the cava is made of composite material so that the cava is a part that is easy to be milled. In addition, the cava is a split type, and specifically each cava is installed on the cava seat using a slot set on the cava seat to avoid mutual influence between the cava, reduce the possibility of a single cava causing the cava assembly as a whole to fail to be normally unsealed, and at the same time reduce the replacement cost of the packer parts.

[0052] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and the specific embodiments of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, other embodiments derived without departing from the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A packer rubber cup, comprising a rubber tube (1) whose upper end diameter is larger than that of the lower end, and a frame (2) embedded in the side wall of the rubber tube (1), characterized in that: The skeleton (2) is a laminated structure, the number of layers of the skeleton (2) is greater than or equal to 2, and the layers forming the skeleton (2) are stacked along the radial direction of the rubber cylinder (1).

2. A packer cup rubber cylinder according to claim 1, characterized in that: Each layer of the frame (2) is made of aluminum alloy sheets.

3. The packer cup rubber cylinder according to claim 1, characterized in that: There are multiple skeletons (2), and the skeletons (2) are evenly distributed in a ring shape relative to the center line of the rubber tube (1).

4. The packer cup rubber cylinder according to claim 1, characterized in that: The lower ends of the various layers of the skeleton (2) are located at the bottom of the rubber tube (1); In the radial direction of the rubber cylinder (1), the relationship between any two layers in the laminated structure is that the top of the layer on the outside is located above the top of the layer on the inside.

5. A packer cup rubber cylinder according to any one of claims 1 to 4, characterized in that: The lower ends of the various layers of the skeleton (2) are all bent in an arc shape and extend toward the center of the rubber tube (1).

6. A packer cup rubber cylinder according to any one of claims 1 to 4, characterized in that: It also comprises a support tube (4), the upper end of the support tube (4) having a tapered hole, the maximum diameter position of the tapered hole being located at the upper end of the support tube (4); The lower end of the rubber tube (1) is a conical structure whose outer shape matches the shape of the conical hole, and the adaptation is: after the lower end of the rubber tube (1) is inserted into the conical hole, the conical structure and the conical hole are interference fit; The rubber tube (1) is inserted at its lower end into the conical hole of the support tube (4) to form a plug-in connection relationship with the support tube (4). In the plug-in connection state, the lower ends of the various layers of the skeleton (2) are located inside the support tube (4), and the upper ends of the various layers of the skeleton (2) are located outside the support tube (4).

7. A packer cup rubber cylinder according to any one of claims 1 to 4, characterized in that: The bottom side of the rubber tube (1) is also inlaid with a connecting seat (5) in the shape of an annular ring and coaxial with the rubber tube (1), and the center hole of the connecting seat (5) serves as a component of the center hole on the bottom side of the rubber tube.

8. The packer cup rubber cylinder according to claim 7, characterized in that: The projections of the lower ends of each layer of the skeleton (2) toward the axis of the rubber tube (1) all fall on the side surface of the connecting seat (5).

9. The packer cup rubber cylinder according to claim 8, characterized in that: The lower end surfaces of each layer of the frame (2) are in contact with the side surfaces of the connecting seat (5), and the inner side surfaces of the frame (2) are in contact with the side surfaces of the connecting seat (5).

10. A packer, characterized in that: A packer comprising the packer leather cup rubber cylinder as described in any one of claims 1 to 9.

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