Rigid supporting piece for rubber sleeve
By installing rigid support inside the rubber cylinder and filling it with liquid to support the rubber cylinder, the problem that the rubber cylinder is prone to creep and fail when supporting heavy cement slurry is solved, and a better sealing effect and load-bearing capacity are achieved, ensuring the improvement of the quality of the well completion.
Patent Information
- Application Number
- CN202422110279.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-29
AI Technical Summary
Existing pure rubber cylinders are prone to creep and fail when bearing heavy cement slurry, resulting in poor sealing effect and insufficient load-bearing capacity, affecting the quality of the well completion.
A rigid support member of the rubber cylinder is designed. By arranging multiple rigid support members in the axis direction inside the rubber cylinder and connecting them with the central tube in a shaft sleeve, it is filled with liquid for expansion support, ensuring that the rubber cylinder is in close contact with the well wall, and even providing support after the rubber cylinder breaks.
It effectively improves the sealing effect and load-bearing capacity of the rubber barrel, avoids the half-way cementing failure caused by the rubber barrel failure, and ensures the improvement of the completion quality.
Smart Images
Figure CN223018599U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of packer rubber cylinders, in particular to a rigid support member for a rubber cylinder. Background Art
[0002] A rubber cylinder generally refers to a cylindrical component made of rubber or elastic material;
[0003] A rigid support member for a rubber cylinder is a component used to provide support for the rubber cylinder and enhance its performance. It is usually annular or cylindrical, matching the shape of the rubber cylinder, and can closely fit on the outside or inside of the rubber cylinder;
[0004] The rubber cylinder is generally a pure rubber rubber cylinder. After expansion and sealing, the rubber cylinder closely adheres to the wellbore wall. After expansion and sealing, the rubber cylinder is responsible for supporting the upper cement slurry. Due to the heavy weight of the cement slurry, it is easy to compress the rubber cylinder to creep downward. When the creep reaches a certain degree, the rubber cylinder will be torn by the lower fixing member. After being torn, the rubber cylinder will completely fail, resulting in the failure of the half-way cementing of the stage collar and affecting the completion quality, causing irreparable losses. Therefore, a rigid support member for a rubber cylinder is proposed to solve the above problems. Content of the Utility Model
[0005] In order to make up for the above deficiencies, the utility model provides a rigid support member for a rubber cylinder, aiming to improve the problems of poor sealing effect and insufficient load-bearing capacity of the pure rubber rubber cylinder in the prior art.
[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:
[0007] A rigid support member for a rubber cylinder includes a rigid support member and a rubber rubber cylinder. A plurality of rigid support members are arranged along the axial direction inside the rubber rubber cylinder. The rubber rubber cylinder is connected to the central pipe in a sleeve connection. A liquid is filled between the rubber rubber cylinder and the central pipe. The right end of the rubber rubber cylinder is engaged with the lower fixing member. After the rubber rubber cylinder is filled with liquid and expanded, the outer surface of the cement slurry contacts the wellbore wall. After the right end of the rubber rubber cylinder is ruptured, cement slurry is filled between its left end and the wellbore wall. After the left end of the rubber rubber cylinder is ruptured, the rigid support member inside it still supports the rubber rubber cylinder to contact the inner wall of the wellbore;
[0008] As a further description of the above technical solution:
[0009] The inner diameter one of the rigid support member is 142 mm, and the outer diameter two of the rigid support member is 150 mm;
[0010] As a further description of the above technical solution:
[0011] Both ends of the rigid support member are provided with support parts. The support parts are composed of multiple groups of equally spaced engaging teeth. The connection between the rigid support member and the support parts is rounded. The radius of the rounded corner is 8 mm;
[0012] As a further description of the above technical solution:
[0013] When not expanded into a circular shape, the continuous multi - group of engaging teeth are angularly distributed on the rigid support member after connection, and the second angle is 112°;
[0014] As a further description of the above technical solution:
[0015] The angle one between the extension lines passing through the centers of the left and right ends of a single engaging tooth is 2.88°, and the pointed angle three at the top of a single one is 60°;
[0016] As a further description of the above technical solution:
[0017] The distance between the top and bottom of the engaging tooth and the inner diameter one and outer diameter two of the rigid support member, namely the first spacing, is 1 mm for both.
[0018] The utility model has the following beneficial effects:
[0019] 1. In the utility model, pure rubber has a certain supporting ability, but its elasticity is also relatively large. By using a rigid support member to support the rubber and then abut against the wellbore wall, a better sealing effect is achieved.
[0020] 2. In the utility model, after the rigid support member is expanded, a good support, bearing and sealing are formed between the rubber barrel and the wellbore wall. After being torn, the rubber barrel will fold downwards and accumulate between the rigid support member and the central pipe, playing a certain role in bearing the cement slurry. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic cross - sectional view of the installation of a rubber barrel rigid support member proposed by the utility model;
[0022] Figure 2 It is a schematic cross - sectional structure view of the rubber barrel rigid support member when expanded into a circular shape proposed by the utility model;
[0023] Figure 3 It is a schematic cross - sectional structure view of the rubber barrel rigid support member when not expanded into a circular shape proposed by the utility model;
[0024] Figure 4 It is a schematic cross - sectional structure view of the rubber barrel rigid support member when the left end is ruptured after being expanded into a circular shape proposed by the utility model;
[0025] Figure 5 It is a schematic cross - sectional structure view of the rubber barrel rigid support member when the right end is ruptured after being expanded into a circular shape proposed by the utility model;
[0026] Figure 6Schematic cross-sectional structure diagram of the rigid support member in a rubber cylinder rigid support member proposed by the present utility model;
[0027] Figure 7 Front view structure diagram of the rubber cylinder in a rubber cylinder rigid support member proposed by the present utility model.
[0028] Legend:
[0029] 1. Wellbore wall; 2. Liquid; 3. Central pipe; 4. Rigid support member; 5. Rubber rubber cylinder; 6. Cement slurry; 7. Lower fixing member; 8. Inner diameter one; 9. Outer diameter two; 10. Fillet; 11. Angle one; 12. Angle two; 13. Angle three; 14. Support part; 15. Spacing one; 16. Biting teeth. Specific implementation mode
[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.
[0031] Refer to Figures 1-5 , an embodiment provided by the present utility model: A rubber cylinder rigid support member includes a rigid support member 4 and a rubber rubber cylinder 5. A plurality of rigid support members 4 are arranged along the axial direction inside the rubber rubber cylinder 5. The rubber rubber cylinder 5 is connected to the central pipe 3 in a sleeve manner. Liquid 2 is filled between the rubber rubber cylinder 5 and the central pipe 3. The right end of the rubber rubber cylinder 5 is engaged with the lower fixing member 7. After the rubber rubber cylinder 5 is filled with liquid 2 and expands, the outer surface of the cement slurry 6 contacts the wellbore wall 1. After the right end of the rubber rubber cylinder 5 ruptures, cement slurry 6 is filled between its left end and the wellbore wall 1. After the left end of the rubber rubber cylinder 5 ruptures, the rigid support member 4 inside it still supports the rubber rubber cylinder 5 to contact the inner wall of the wellbore wall 1, so that the rubber rubber cylinder 5 can always contact the wellbore wall 1, and at the same time ensure a certain supporting force to avoid the failure of the rubber rubber cylinder 5.
[0032] Refer to Figure 6 and Figure 7The inner diameter 8 of the rigid support member 4 is 142mm, the outer diameter 9 of the rigid support member 4 is 150mm, and support parts 14 are provided at both ends of the rigid support member 4. The support part 14 is composed of multiple groups of equidistant meshing teeth 16. The connection between the rigid support member 4 and the support part 14 is processed with a fillet 10, and the radius of the fillet 10 is 8mm. When the fillet is not rounded, the extension lines of the two ends after the continuous groups of meshing teeth 16 are connected pass through the center of the circle and are distributed at an angle of 12 on the rigid support member 4. The angle 12 is 112°. The angle 11 between the extension lines of the left and right ends of a single meshing tooth 16 passing through the center of the circle is 2.88° to ensure the support contact area and uniform supporting force.
[0033] The sharp angle 313 of the top end of a single engaging tooth 16 is 60°, and the distance 15 between the top and bottom ends of the engaging tooth 16 and the inner diameter 18 and the outer diameter 29 of the rigid support member 4 is 1 mm. The engaging teeth 16 can be continuously locked in multiple stages, that is, locked at any time, to ensure that the rigid support member 4 will not shrink during expansion, thereby always providing sufficient supporting force for the rubber tube 5.
[0034] Working principle: By setting a rigid support member 4 in the rubber tube 5, such as Figure 2 , it can expand and support on the well wall 1 as the rubber rubber tube 5 expands and seals. The rigid support member 4 expands and forms a self-support. When the rigid support member 4 is opened, if the rubber rubber tube 5 creeps and tears, the rigid support member 4 will not fail and will continue to support. Figure 4 The torn rubber tube 5 will be folded downward and accumulate between the rigid support 4 and the central tube 3, playing a certain role in supporting the cement slurry 6. After the accumulation, there is still liquid in the rubber tube 5 below the rigid support 4, so this part is more substantial under the pressure of the cement slurry 6, and the effect of fitting the well wall 1 is better. If the rubber tube 5 below the rigid support 4 is torn during the creep process, the rigid support 4 can still support the cement slurry 6 with the rubber tube 5 above it. Figure 5 Even if there is a gap between the rigid support member 4 and the well wall 1, the cement slurry 6 can solidify naturally after a certain period of time, which can ensure a good half-way cementing effect and greatly reduce losses and subsequent well repairs.
[0035] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A rubber cartridge rigid support member, comprising a rigid support member (4) and a rubber cartridge (5), characterized in that: A plurality of rigid support members (4) are arranged inside the rubber tube (5) along the axial direction. The rubber tube (5) is connected to the center tube (3) in the form of a shaft sleeve. Liquid (2) is filled between the rubber tube (5) and the center tube (3). The right end of the rubber tube (5) is engaged with the lower fixing member (7). After the rubber tube (5) is filled with the liquid (2) and expanded, the outer surface of the cement slurry (6) contacts the well wall (1). After the right end of the rubber tube (5) is broken, the cement slurry (6) is filled between the left end and the well wall (1). After the left end of the rubber tube (5) is broken, the rigid support member (4) inside the rubber tube (5) still supports the rubber tube (5) to contact the inner wall of the well wall (1).
2. A rubber cartridge rigid support according to claim 1, characterized in that: The inner diameter 1 (8) of the rigid support member (4) is 142 mm, and the outer diameter 2 (9) of the rigid support member (4) is 150 mm.
3. The rigid support member for a rubber cartridge according to claim 1, characterized in that: Both ends of the rigid support member (4) are provided with support portions (14), the support portions (14) being composed of a plurality of groups of equidistant meshing teeth (16), and the connection between the rigid support member (4) and the support portion (14) is provided with a rounded corner (10), the radius of the rounded corner (10) being 8 mm.
4. The rigid support member for a rubber cartridge according to claim 1, characterized in that: When not rounded, the plurality of continuous groups of meshing teeth (16) are connected and distributed at an angle of two (12) on the rigid support member (4), and the angle of two (12) is 112°.
5. A rubber cartridge rigid support according to claim 4, characterized in that: The angle one (11) between the extended lines of the left and right ends of a single meshing tooth (16) passing through the center of the circle is 2.88°, and the angle three (13) of the tip of a single top is 60°.
6. A rubber cartridge rigid support according to claim 5, characterized in that: The distance (15) between the top and bottom ends of the engaging teeth (16) and the inner diameter (8) and the outer diameter (9) of the rigid support member (4) is 1 mm.