Gum barrel assembly, packer, and methods of using the same

Abstract

The present application relates to the technical fields of oil well open hole completion, and specifically relates to a rubber sleeve assembly, a packer and a use method thereof. The rubber sleeve assembly comprises: a first rubber sleeve; a first support ring arranged at a longitudinal upper end of the first rubber sleeve; a second rubber sleeve arranged longitudinally below the first rubber sleeve; and a second support ring arranged at a longitudinal lower end of the second rubber sleeve; wherein in an initial state, the first support ring covers an upper end portion of the first rubber sleeve radially outward, and the second support ring covers a lower end portion of the second rubber sleeve radially outward; and wherein in a compressed state, the first support ring is configured to be more easily deformed radially outward than the second support ring, so as to allow the first rubber sleeve to expand radially outward earlier than the second rubber sleeve. The rubber sleeve assembly can overcome the problems of rubber sleeve damage or insufficient setting.

Description

Technical Field

[0001] This invention belongs to the field of open-hole completion technology for oil wells, specifically relating to a rubber sleeve assembly, a packer, and its usage method. Background Technology

[0002] In open-hole completion operations in oil and gas fields, downhole packers are key tools for achieving physical isolation and pressure sealing between different formation sections within the wellbore. Their core function is to tightly conform to the open-hole wall through deformation, cutting off fluid communication between upper and lower formations and preventing inter-layer flow. This provides reliable isolation for annular sealing, gas channeling prevention, and layered cementing operations during cementing completion, making them indispensable equipment for ensuring the quality of cementing completion and improving wellbore integrity. Downhole packers can be classified into six categories according to the sealing method of the packer: expansion packer, compression packer, self-sealing packer, wedge packer, self-expanding packer, and combined packer. Among them, compression packers are the most widely used in conventional oil and gas well cementing and completion operations due to their relatively simple structure, convenient operation, and adaptability to various downhole conditions. The core working principle of a compression packer is to achieve a seal by driving the packer element with axial force. During downhole operation, the packer is in a contracted state. After reaching the designed depth, an axial load is applied to the packer to compress the elastic rubber sleeve inside, causing axial compression and radial expansion deformation. This ultimately results in a tight seal against the wellbore or casing inner wall, forming an effective sealing surface. After setting, the packer is anchored and fixed using a slip mechanism to maintain the long-term stability of the seal and ensure pressure bearing requirements during cementing and completion operations.

[0003] However, existing compression packers still have significant technical shortcomings in practical applications of open-hole completions. Compression packers may experience issues such as sleeve breakage or ineffective setting.

[0004] Furthermore, the blind plate structure used in conjunction with the compression packer needs to be removed after setting by additional drilling or milling operations. This not only increases the number of cementing and completion procedures and prolongs the operation cycle, but also may cause casing damage or packer sealing performance impairment due to mechanical impact during drilling and milling, increasing the cost and safety risks of cementing and completion operations. Summary of the Invention

[0005] This invention provides a rubber sleeve assembly, a packer, and a method of using the same, which can solve at least one of the above-mentioned technical problems.

[0006] According to a first aspect of the present invention, a rubber sleeve assembly is provided, comprising: a first rubber sleeve; a first support ring disposed at the upper longitudinal end of the first rubber sleeve; a second rubber sleeve located longitudinally below the first rubber sleeve; and a second support ring disposed at the lower longitudinal end of the second rubber sleeve; wherein, in an initial state, the first support ring covers the upper portion of the first rubber sleeve radially outward, and the second support ring covers the lower portion of the second rubber sleeve radially outward; wherein, under longitudinal compression, the first support ring is configured to deform radially outward more readily than the second support ring, thereby allowing the first rubber sleeve to expand radially outward before the second rubber sleeve.

[0007] The aforementioned rubber sleeve assembly allows the first rubber sleeve to expand radially first, followed by the second rubber sleeve, when subjected to longitudinal compression. This sequential expansion prevents the rubber sleeves from continuing to slip axially after they have expanded to contact the outer well wall, thus helping to avoid rubber sleeve breakage. Simultaneously, this also helps prevent friction between the rubber sleeves and the well wall from hindering further longitudinal compression, ensuring that the rubber sleeves are fully compressed and can expand radially outwards sufficiently for a complete and effective setting seal.

[0008] Preferably, the first support ring has a cross-sectional profile that is inclined relative to the longitudinal axis of the rubber sleeve assembly, and the upper end of the first support ring is located radially inward relative to the lower end of the first support ring.

[0009] Preferably, the first support ring includes a plurality of support pieces arranged independently of each other in the circumferential direction around the upper portion of the first rubber tube.

[0010] Preferably, the rubber sleeve assembly further includes a shoulder disposed above the first support ring, the shoulder covering a portion of the first support ring radially outward.

[0011] Preferably, the lower portion of the shoulder pad is constructed with a longitudinally extending slit to facilitate radial outward expansion and deformation of the shoulder pad.

[0012] Preferably, the upper end of the first support ring is constructed as a free end.

[0013] Preferably, the second support ring includes: a connecting ring located below the second rubber tube, the connecting ring being configured to be fixedly connected to the compression sleeve of the packer; and an extension portion connected to the upper end of the connecting ring, the extension portion being longitudinally connected upward from the connecting ring to cover the lower end portion of the second rubber tube radially outward.

[0014] Preferably, the rubber sleeve assembly further includes an intermediate rubber sleeve located longitudinally between the first rubber sleeve and the second rubber sleeve, the intermediate rubber sleeve being configured to expand radially outward after the first rubber sleeve has expanded radially outward and before the second rubber sleeve has expanded radially outward.

[0015] Preferably, an intermediate support ring is provided between the first rubber tube and the intermediate rubber tube and / or between the second rubber tube and the intermediate rubber tube.

[0016] According to a second aspect of the invention, a packer is provided, comprising: a packer body extending longitudinally, the packer body including a first segment with a larger outer diameter located longitudinally upward, and a second segment with a smaller outer diameter located longitudinally downward, a variable-diameter step forming between the first segment and the second segment; the aforementioned rubber sleeve assembly sleeved over the second segment of the packer body; and a compression sleeve sleeved over the second segment and located longitudinally downward of the rubber sleeve assembly. The first support ring is longitudinally adjacent to the variable-diameter step, and the compression sleeve is configured to push the rubber sleeve assembly longitudinally upward and compress the rubber sleeve assembly longitudinally together with the variable-diameter step, causing the rubber sleeve assembly to expand and deform radially outward.

[0017] According to a third aspect of the invention, a method of using the packer described above is provided, comprising the following steps: the compression sleeve moves longitudinally upward to move the rubber sleeve assembly longitudinally upward to abut against the variable diameter step; the compression sleeve continues to move longitudinally upward to compress the rubber sleeve assembly longitudinally together with the variable diameter step, causing the rubber sleeve assembly to expand and deform radially outward.

[0018] Preferably, as the compression sleeve continues to move longitudinally upward, the lower end of the first support ring flips outward and tilts up, so as to allow the first rubber sleeve to expand radially outward before the second rubber sleeve.

[0019] The rubber plug assembly, packer, and method of use of the present invention enable the first rubber sleeve to expand radially outward first, thus achieving initial engagement with the wellbore wall and setting. Subsequently, using the set first rubber sleeve as an anchor point, the intermediate and second rubber sleeves move upward due to longitudinal compression. During this process, they have not yet engaged with the wellbore wall, therefore avoiding interaction with the wellbore wall and preventing tearing or wear of the rubber sleeves. Simultaneously, this top-to-bottom sequential setting process ensures that each rubber sleeve is sufficiently compressed and expands radially outward for adequate setting, avoiding insufficient setting caused by friction or jamming between the rubber sleeves and the wellbore wall. Attached Figure Description

[0020] The invention will be described in more detail below with reference to the accompanying drawings.

[0021] Figure 1 A schematic diagram of one embodiment of the packer according to the present invention is shown.

[0022] Figure 2 A schematic diagram of a structure of a rubber sleeve assembly according to an embodiment of the present invention is shown.

[0023] Figure 3 A schematic diagram of one embodiment of a blind flange section used in conjunction with the packer of the present invention is shown.

[0024] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale. Detailed Implementation

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] Figure 1 A schematic diagram of a structure of an embodiment of the packer 1 according to the present invention is shown.

[0027] The packer 1 generally includes a packer body 10, a rubber sleeve assembly 20 and a compression sleeve 30 fitted on the packer body 10, and a drive mechanism 40 disposed below the compression sleeve 30 and the packer body 10.

[0028] like Figure 1 As shown, the packer body 10 extends longitudinally and is generally constructed as a cylindrical structure. The packer body 10 includes a first section 11 with a larger outer diameter located relatively above the longitudinal direction, and a second section 12 with a smaller outer diameter located relatively below the longitudinal direction. A variable diameter step 13 is formed between the first section 11 and the second section 12.

[0029] The aforementioned rubber sleeve assembly 20 is fitted onto the second section 12 of the packer body 10. In the initial state, the rubber sleeve assembly 20 can be arranged adjacent to the variable diameter step 13. This means that the rubber sleeve assembly 20 can be in direct contact with the variable diameter step 13, or it can be slightly spaced apart from the variable diameter step 13.

[0030] The compression sleeve 30 is also fitted onto the second section 12 of the packer body 10 and is located below the cartridge assembly 20. The compression sleeve 30 can be connected to the cartridge assembly 20. This will be described in detail below.

[0031] The drive mechanism 40 is disposed below the packer body 10 and the compression sleeve 30, and is configured to push the compression sleeve 30 longitudinally upward as needed to compress the rubber sleeve assembly 20 longitudinally together with the variable diameter step 13. The drive mechanism 40 may be a piston unit, preferably a hydraulically driven double-cylinder tandem piston unit. The drive mechanism 40 may employ structures known in the art, which will not be described in detail here.

[0032] Figure 2 An embodiment of the glue cartridge assembly 20 is shown.

[0033] The rubber sleeve assembly 20 may include a shoulder protector 21, a first support ring 22, a first rubber sleeve 23, an intermediate support ring 24, an intermediate rubber sleeve 25, an intermediate support ring 26, a second rubber sleeve 27, and a second support ring 28, arranged and connected longitudinally from top to bottom. The first rubber sleeve 23, the intermediate rubber sleeve 25, and the second rubber sleeve 28 may be made of rubber, silicone, or any other suitable material.

[0034] The aforementioned first support ring 22 has a cross-sectional profile that is inclined relative to the longitudinal axis of the rubber sleeve assembly 20, with its upper end positioned radially inward relative to its lower end. In other words, the first support ring 22 has a structural profile that gradually expands from top to bottom. In its initial state, the first support ring 22 can cover the upper region of the first rubber sleeve 23 radially outward. Therefore, the first support ring 22 can protect the first rubber sleeve 23 from impacts and scratches within the wellbore. Furthermore, the first support ring 22 can also limit the radial outward expansion of the first rubber sleeve 23 in its initial state.

[0035] The inclined inner surface of the first support ring 22 engages with the corresponding inclined outer surface of the first rubber sleeve 23, preferably vulcanized together. The upper end of the first support ring 22 is constructed as a free end. Thus, when the rubber sleeve assembly is subjected to axial compression, its first support ring 22 can be radially outwardly rotated to expose the upper portion of the first rubber sleeve 23 on the outside. As a result, the first rubber sleeve 23 can easily undergo radially outward expansion deformation. That is, the first rubber sleeve 23 can be given a higher priority for radially outward expansion.

[0036] Preferably, the first support ring 22 may include a plurality of support pieces arranged independently of each other in the circumferential direction around the upper portion of the first rubber sleeve 23. The plurality of support pieces may be adjacent and in contact with each other in the initial state, or spaced apart from each other. This structure makes the first support ring 22 more prone to radially outward expansion deformation, thereby improving the priority of radially outward expansion of the first rubber sleeve 23.

[0037] Additionally, as needed, the first support ring 22 may also include auxiliary connecting rings (not shown) disposed above the plurality of support plates. Each support plate may be connected to the auxiliary connecting ring individually, or may be integrally formed. This facilitates the manufacturing and assembly of the first support ring 22.

[0038] The ease with which the first rubber sleeve 23 expands radially outward can be adjusted by adjusting the material and / or thickness of the first support ring 22 (support piece). For example, by making the first support ring 22 (support piece) thinner or softer, the first rubber sleeve 23 can expand radially outward more easily; by making the first support ring 22 (support piece) thicker or harder, the first rubber sleeve 23 can expand radially outward more difficultly.

[0039] exist Figure 2 In the illustrated embodiment, a shoulder 21 is further provided above the first support ring 22. The shoulder 21 may also be configured to extend longitudinally outward from top to bottom and may cover a portion of the first support ring 22. The lower portion of the shoulder 21 may be configured with longitudinally extending slits to divide its lower portion into multiple independent shoulder pieces. This makes the lower portion of the shoulder 21 more prone to radially outward expansion deformation, thereby improving the priority of radially outward expansion of the first rubber sleeve 23.

[0040] It is understood that in some embodiments, the shoulder guard 21 may be omitted. For example, in Figure 1 In the illustrated embodiment, the rubber sleeve assembly 20 does not have a shoulder. By adding or omitting the shoulder, the degree of difficulty in the radial outward expansion of the first rubber sleeve 23 can be adjusted.

[0041] For example Figure 2 As shown, an intermediate support ring 24 is disposed below the first rubber sleeve 23. The intermediate support ring 24 is located between the first rubber sleeve 23 and the intermediate rubber sleeve 25. The intermediate support ring 24 includes an outer surface and an inner surface that are generally parallel and spaced apart. The outer surface faces the annulus within the well. The inner surface faces and engages with the outer wall of the second section 12 of the packer body 10. A sealing groove 241 is formed on the inner surface of the intermediate support ring 24. A sealing ring (e.g., an O-ring) can be disposed within the sealing groove 241 to facilitate the formation of a seal between the intermediate support ring 24 and the packer body 10.

[0042] The intermediate support ring 24 may have a certain rigidity to facilitate support for the first rubber cylinder 23 and the intermediate rubber cylinder 25.

[0043] The intermediate support ring 24 may be configured with a first inclined end face 242 for engaging with the first rubber sleeve 23. This first inclined end face 242 is configured to extend radially outward from top to bottom along the longitudinal direction. The first rubber sleeve 23 is configured with an inclined connecting surface that matches the first inclined end face 242. This configuration reduces the thickness of the first rubber sleeve 23 at its edges, making it easier for the first rubber sleeve 23 to expand and deform radially outward more fully. Furthermore, the intermediate support ring 24 supports the first rubber sleeve 23 from the inside, without restricting the degree of expansion of the first rubber sleeve 23, which also facilitates easier and more complete radial outward expansion and deformation of the first rubber sleeve 23.

[0044] Additionally, the intermediate support ring 24 may also be configured with a second inclined end face 243 for mating with the intermediate rubber sleeve 25. This second inclined end face 243 is configured to extend radially outward from top to bottom along the longitudinal direction. The intermediate rubber sleeve 25 is configured with an inclined connecting surface that matches the second inclined end face 243. This facilitates reducing the thickness of the intermediate rubber sleeve 25 at the edges, thereby making it easier for the intermediate rubber sleeve 25 to expand and deform radially outward sufficiently.

[0045] Preferably, the angle between the second inclined end face 243 and the longitudinal axis is greater than the angle between the first inclined end face 242 and the longitudinal axis.

[0046] An intermediate support ring 26 is disposed below the intermediate rubber sleeve 25. The intermediate support ring 26 is located between the intermediate rubber sleeve 25 and the second rubber sleeve 27. The intermediate support ring 26 includes a generally parallel and spaced-apart outer surface and an inner surface. The outer surface faces the annulus within the well. The inner surface faces and engages with the outer wall of the second section 12 of the packer body 10. A sealing groove 261 is formed on the inner surface of the intermediate support ring 26. A sealing ring (e.g., an O-ring) can be disposed within the sealing groove 261 to facilitate the formation of a seal between the intermediate support ring 26 and the packer body 10.

[0047] The intermediate support ring 26 may have a certain rigidity to facilitate support for the intermediate rubber cylinder 25 and the second rubber cylinder 27.

[0048] The intermediate support ring 26 may be configured with a first inclined end face 2662 for engaging with the second rubber sleeve 27. This first inclined end face 262 is configured to extend radially outward from bottom to top along the longitudinal direction. The second rubber sleeve 27 is configured with an inclined connecting surface that matches the first inclined end face 262. This configuration, on the one hand, reduces the thickness of the second rubber sleeve 27 at the edges, thereby making it easier for the second rubber sleeve 27 to expand and deform radially outward sufficiently; on the other hand, the intermediate support ring 26 supports the second rubber sleeve 27 from the inside, without restricting the degree of expansion of the second rubber sleeve 27, which also facilitates easier and more complete radial outward expansion and deformation of the second rubber sleeve 27.

[0049] Additionally, the intermediate support ring 26 may also be configured with a second inclined end face 263 for mating with the intermediate rubber sleeve 25. This second inclined end face 263 is configured to extend radially outward from bottom to top along the longitudinal direction. The intermediate rubber sleeve 25 is configured with an inclined connecting surface that matches the second inclined end face 263. This facilitates reducing the thickness of the intermediate rubber sleeve 25 at the edges, thereby making it easier for the intermediate rubber sleeve 25 to expand and deform radially outward sufficiently.

[0050] Preferably, the angle between the second inclined end face 263 and the longitudinal axis is greater than the angle between the first inclined end face 262 and the longitudinal axis.

[0051] Preferably, one or more grooves 251 are formed on the inner side of the intermediate rubber sleeve 25. These grooves 251 facilitate the deformation of the intermediate rubber sleeve 25. Additionally, a sealing ring (e.g., an O-ring) can be provided within one or more grooves 251 to further facilitate the formation of a seal between the intermediate rubber sleeve 25 and the packer body 10. The cross-section of the aforementioned grooves 251 can be constructed as rectangular, triangular, semi-circular, or trapezoidal as needed.

[0052] If necessary, the intermediate rubber tube 25 can be omitted, or more intermediate rubber tubes can be arranged longitudinally. The intermediate rubber tubes can be separated by additional intermediate support rings.

[0053] The second support ring 28 is disposed below the second rubber sleeve 27. The second support ring 28 includes a connecting ring 282 located below the second rubber sleeve 27. The connecting ring 282 is configured for secure connection to the compression sleeve 30 of the packer 1. Figure 1 In the illustrated embodiment, the upper edge of the compression sleeve 30 extends radially outward of the connecting ring 282 to circumferentially surround the connecting ring 282. This ensures a stable engagement between the connecting ring 282 and the compression sleeve 30, providing a basis for controlling the ease of expansion of the second rubber sleeve 27.

[0054] Connecting ring 282 can be as follows Figure 2 The surface shown has a rectangular cross-section and a certain thickness to ensure its structural stability.

[0055] A sealing groove 281 may be constructed on the inner side of the connecting ring 282 for setting a sealing ring (e.g., an O-ring) to facilitate the formation of a seal between the connecting ring 282 and the packer body 10.

[0056] The second support ring 28 also includes an extension 283 extending longitudinally upward from the upper end of the connecting ring 282. The extension 283 covers the lower end portion of the second rubber sleeve 27 radially outward.

[0057] Because the second support ring 28 forms a connection between the second rubber sleeve 27 and the compression sleeve, it is less prone to radial outward expansion deformation compared to the first support ring 22. Consequently, the second rubber sleeve 27 is less prone to radial outward expansion deformation compared to the first rubber sleeve 23. This allows for control over the expansion priority order of each rubber sleeve.

[0058] The ease with which the second rubber sleeve 27 expands radially outward can be adjusted by adjusting the material and / or thickness of the extension portion 283. For example, by making the extension portion 283 thinner or softer, the second rubber sleeve 27 can expand radially outward more easily; by making the extension portion 283 thicker or harder, the second rubber sleeve 27 can expand radially outward more difficultly.

[0059] Additionally, the ease with which the second rubber sleeve 27 expands radially outward can be adjusted by changing the connection position between the extension portion 283 and the connecting ring 282. Figure 2 In the illustrated embodiment, the lower end of the extension 283 is connected to the radially innermost region of the upper end of the connecting ring 282. This helps reduce the ease with which the second rubber sleeve 27 expands radially outward. If necessary, the connecting region can also be moved to a more radially outward region, thereby increasing the ease with which the second rubber sleeve 27 expands radially outward.

[0060] By adjusting the first support ring 22, the intermediate support rings 24 and 26, and the second support ring 28, the expansion timing of the first rubber cylinder 23, the intermediate rubber cylinder 25, and the second rubber cylinder 27 can be controlled, thereby enabling the first rubber cylinder 23, the intermediate rubber cylinder 25, and the second rubber cylinder 27 to expand and seal in sequence.

[0061] Additionally, a blind flange 52 can be installed in the internal channel of the packer 1 as needed. Specifically, the blind flange 52 can be installed downstream of the communication hole 41 in the drive mechanism 40, thereby facilitating pressure build-up during packer 1 setting.

[0062] Alternatively, another blind flange section 50 can be directly connected to or spaced apart below the packer 1. For example... Figure 3 As shown, the blind flange section 50 may include an upper connector 51 and a lower connector 53. The lower end of the upper connector 51 is provided with internal threads. The upper end of the lower connector 53 is provided with external threads. The upper connector 51 and the lower connector 53 can thus be threadedly connected. An installation step is formed inside the upper connector 51. A blind flange 52 is provided at the lower end of the installation step. The upper end of the lower connector 53 can support the blind flange 52 from below.

[0063] The blind flange 52 may be made of glass, ceramic or any other suitable material. Once the packer 1 is set, the blind flange 52 can be broken by the pressure buildup in the well (e.g., exceeding about 40 MPa), thereby clearing the wellbore.

[0064] Preferably, the lower surface of the edge region of the blind flange 52 is constructed as a slope 521, which slopes upward in a radially outward direction. The upper end of the lower connector 53 is constructed with a matching slope to fit against the slope 521 of the blind flange 52. On the one hand, this helps to increase the contact area between the lower connector 53 and the blind flange 52, thereby facilitating stress dispersion. On the other hand, when the blind flange 52 breaks, the edge portion of the blind flange 52 can slide down along the slope 521 to the bottom of the well. Thus, it is possible to avoid the impact of residual blind flange 52 on the effectiveness of subsequent operations, and to ensure that the wellbore is fully and effectively cleared.

[0065] The following will be joined Figures 1 to 3 The method of using the packer 1 of the present invention will be described in detail.

[0066] First, the tubing string with packer 1 installed is lowered into the well.

[0067] Then, pressure is applied inside the well to activate the drive mechanism 40, which pushes the compression sleeve 30, thereby pushing the rubber plug assembly 20 to move longitudinally upward.

[0068] The rubber stopper assembly 20 is longitudinally compressed between the diameter-reducing step 13 and the compression sleeve 30. Since the upper end of the first support ring 22 above the first rubber cylinder 23 is a free end, when it is compressed with the diameter-reducing step 13, the lower end of the first support ring 22 will flip outward and tilt upward, thus providing free space for the expansion of the first rubber cylinder 23. Therefore, the first rubber cylinder 23 can preferentially expand radially outward.

[0069] Subsequently, as the rubber stopper assembly 20 continues to be longitudinally compressed, the intermediate rubber cylinder 25 begins to expand radially outward.

[0070] Subsequently, as the rubber stopper assembly 20 is further compressed longitudinally, the second support ring 28 expands and deforms radially outward, thereby making room for the expansion of the second rubber sleeve 27. Therefore, the second rubber sleeve 27 can begin to expand radially outward.

[0071] For the rubber plug assembly 20 of the present invention, the first rubber sleeve 23 expands radially outward first, thus enabling it to engage with the well wall first and achieve setting. Subsequently, using the set first rubber sleeve 23 as an anchor point, the intermediate rubber sleeve 25 and the second rubber sleeve 27 move upward due to longitudinal compression. During this process, they have not yet engaged with the well wall, therefore no interaction occurs between them, thus avoiding tearing or wear of the rubber sleeves. Simultaneously, this top-to-bottom sequential setting process ensures that each rubber sleeve is sufficiently compressed and expands radially outward for setting, avoiding insufficient setting caused by friction or jamming between the rubber sleeve and the well wall.

[0072] Once the rubber sleeve assembly 20 is fully set, pressure can be applied inside the well to cause the blind plate 52 to rupture, thereby achieving unblocking of the entire wellbore.

[0073] In this document, "longitudinal" refers to the direction extending along the wellbore. "Up" refers to the direction longitudinally toward the wellhead. "Down" refers to the direction longitudinally toward the bottom of the well. Unless explicitly stated in the context, this invention is not intended to limit the application of the packer to vertical wells by using the terms "longitudinal," "up," and "down." It is understood that the packer of this invention can also be used in deviated and horizontal wells.

[0074] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A rubber sleeve assembly, comprising: First glue tube; A first support ring is disposed at the upper longitudinal end of the first rubber tube; A second glue tube, located longitudinally below the first glue tube; and A second support ring is provided at the lower longitudinal end of the second rubber tube; In the initial state, the first support ring covers the upper part of the first rubber tube radially outward, and the second support ring covers the lower part of the second rubber tube radially outward. When subjected to longitudinal compression, the first support ring is configured to deform radially outward more easily than the second support ring, so as to allow the first rubber sleeve to expand radially outward before the second rubber sleeve.

2. The rubber sleeve assembly according to claim 1, characterized in that, The first support ring has a cross-sectional profile that is inclined relative to the longitudinal axis of the rubber sleeve assembly, and the upper end of the first support ring is located radially inward relative to the lower end of the first support ring.

3. The rubber sleeve assembly according to claim 1 or 2, characterized in that, The first support ring includes a plurality of support plates arranged independently of each other in the circumferential direction around the upper portion of the first rubber tube.

4. The rubber sleeve assembly according to any one of claims 1 to 3, characterized in that, It also includes a shoulder disposed above the first support ring, the shoulder covering a portion of the first support ring radially outward.

5. The rubber sleeve assembly according to claim 4, characterized in that, The lower part of the shoulder pad is constructed with a longitudinally extending slit to facilitate radial outward expansion and deformation of the shoulder pad.

6. The rubber sleeve assembly according to any one of claims 1 to 5, characterized in that, The upper end of the first support ring is constructed as a free end.

7. The rubber sleeve assembly according to any one of claims 1 to 6, characterized in that, The second support ring includes: A connecting ring located below the second rubber sleeve, the connecting ring being configured for secure connection with the compression sleeve of the packer; and An extension portion is connected to the upper end of the connecting ring, the extension portion being connected longitudinally upward from the connecting ring to cover the lower end portion of the second rubber tube radially outward.

8. The rubber sleeve assembly according to any one of claims 1 to 7, characterized in that, It also includes an intermediate rubber tube, which is located longitudinally between the first rubber tube and the second rubber tube, and is configured to expand radially outward after the first rubber tube expands radially outward and before the second rubber tube expands radially outward.

9. The rubber sleeve assembly according to claim 8, characterized in that, An intermediate support ring is provided between the first rubber tube and the intermediate rubber tube and / or between the second rubber tube and the intermediate rubber tube.

10. A packer, comprising: The packer body extends longitudinally and includes a first section with a larger outer diameter located at the upper part of the longitudinal direction and a second section with a smaller outer diameter located at the lower part of the longitudinal direction, forming a variable diameter step between the first section and the second section; The glue sleeve assembly according to any one of claims 1 to 9, wherein the glue sleeve assembly is sleeved outside the second section of the packer body; as well as A compression sleeve is fitted over the second section and located longitudinally below the rubber sleeve assembly. Wherein, the first support ring and the variable diameter step are adjacent in the longitudinal direction, and the compression sleeve is configured to push the rubber sleeve assembly in the longitudinal direction and compress the rubber sleeve assembly together with the variable diameter step in the longitudinal direction, so that the rubber sleeve assembly expands and deforms radially outward.

11. A method of using the packer according to claim 10, comprising the following steps: The compression sleeve moves longitudinally upward so that the rubber sleeve assembly moves longitudinally upward until it abuts against the variable diameter step; The compression sleeve continues to move longitudinally upward to compress the rubber sleeve assembly longitudinally together with the variable diameter step, causing the rubber sleeve assembly to expand and deform radially outward.

12. The method according to claim 11, characterized in that, As the compression sleeve continues to move longitudinally upward, the lower end of the first support ring flips outward and tilts up, allowing the first rubber sleeve to expand radially outward before the second rubber sleeve.

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