A protective structure for the end of a packer rubber tube

Abstract

The present application provides a protective structure for the end of a packer rubber cylinder, including: a skeleton and a fixing ring, both of which are circular ring structures. The outer wall of the skeleton is provided with a plurality of protrusions along a circumferential array, and the outer surface of the protrusion has an external thread; the inner wall of the fixing ring has an internal thread, and when the fixing ring is coaxially connected to the skeleton, the internal thread on the fixing ring meshes with the external thread on the protrusion; it also includes a plurality of blades, each of which has a through hole at its root, and the blades are made of hard metal, and the blades are arranged along the circumferential array of the skeleton and enclosed to form a circular tube structure; the blades are sleeved on the outside of the protrusion through the through hole, and the top of the blade faces the same side of the skeleton, and the blades are swingingly arranged with the tangent of the skeleton passing through the protrusion as the axis, and the side of the blade overlaps with the side of the adjacent blade. This scheme completely covers the end of the rubber cylinder during the expansion of the rubber cylinder, provides sufficient support and sealing for the rubber cylinder, thereby effectively preventing the rubber cylinder from being damaged, and improving the sealing and pressure-bearing capacity of the rubber cylinder.

Description

Technical Field

[0001] The utility model belongs to the technical field of drilling plugging tools, in particular to a protective structure for the end of a packer rubber sleeve. Background Art

[0002] A packer is a downhole sealing tool that primarily seals the annular space between the tubing and casing. It is commonly used in oilfield injection, stratified reforming, stratified oil production, and pipeline water plugging operations. As a key component of a packer, the rubber sleeve is subject to a large axial pressure differential during sealing, which can easily lead to abnormal deformation of the sleeve's end, reducing its sealing effectiveness and pressure-bearing capacity.

[0003] Patent application number CN2858935Y discloses a high-temperature and high-pressure compression seal rubber cylinder. A high-temperature resistant plastic shoulder guard, which is vulcanized and formed together with the rubber cylinder, is bonded to one or both sides of the rubber cylinder. Although the rubber cylinder can be protected to ensure its pressure-bearing capacity, the shoulder guard has good ductility and certain elasticity, and therefore cannot provide sufficient support and limiting effect for the end of the rubber cylinder, resulting in the risk of increased shoulder protrusion or even damage to the rubber cylinder. Utility Model Content

[0004] In order to address the shortcomings of the existing technology, the utility model provides a protective structure for the end of the rubber cylinder of the sealer, which completely covers the end of the rubber cylinder during the expansion process of the rubber cylinder, provides sufficient support force and sealing for the rubber cylinder, thereby effectively preventing the rubber cylinder from being damaged and improving the sealing and pressure-bearing capacity of the rubber cylinder.

[0005] In order to achieve the purpose of this utility model, the following scheme is proposed:

[0006] A packer rubber cylinder end protection structure comprises a skeleton and a fixing ring, both of which are circular ring structures.

[0007] The outer side wall of the frame is provided with a plurality of protrusions in a circumferential array, and the outer surfaces of the protrusions have external threads;

[0008] The inner wall of the fixing ring has an internal thread. When the fixing ring is coaxially connected to the frame, the internal thread on the fixing ring engages with the external thread on the protrusion; and further includes,

[0009] Multiple blades are provided with through holes at their roots. The blades have a predetermined strength. The blades are arranged in an array along the circumference of the skeleton and enclosed to form a circular tube structure. The blades are sleeved on the outside of the protrusion through the through holes, with the tops of the blades facing the same side of the skeleton. The blades are swinging around the tangent of the skeleton passing through the protrusion, and the sides of the blades overlap with the sides of adjacent blades.

[0010] The beneficial effect of the present invention is that during the sealing process of the packer, when the rubber cylinder expands outward under pressure, the outward protruding part of its end will generate an extrusion force on the blades, thereby causing the blades to swing outward and open. The blades are used to support the end of the rubber cylinder, and the outward protrusion of the end of the rubber cylinder is limited to a predetermined space, thereby avoiding abnormal deformation of the end of the rubber cylinder due to the outward protrusion, thereby improving the sealing and pressure-bearing capacity of the rubber cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present invention.

[0012] Figure 1 Shown is a schematic diagram of the overall structure of this application.

[0013] Figure 2 Shown is an exploded view of the structure of this application.

[0014] Figure 3 A half-section view of the present application after being assembled with the rubber cartridge is shown.

[0015] Markings in the figure: skeleton-1, protrusion-11, fixing ring-2, blade-3, through hole-31, tape-4, rubber cylinder-91, center tube-92. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the implementation methods of the present invention are described in detail below with reference to the accompanying drawings. However, the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] like Figures 1 to 3 As shown, a packer rubber cylinder end protection structure includes: a skeleton 1 and a fixing ring 2, both of which are circular ring structures, and the skeleton 1 and the fixing ring 2 are both made of hard metal.

[0018] The outer wall of the frame 1 is provided with a plurality of protrusions 11 arranged in a circumferential array, with predetermined spacing between adjacent protrusions 11. The outer surfaces of the protrusions 11 are externally threaded. Specifically, all protrusions 11 may be externally threaded, or some may be externally threaded, but the threads are evenly distributed along the circumference of the frame 1.

[0019] The inner wall of the fixing ring 2 has an internal thread. When the fixing ring 2 is coaxially connected to the frame 1, the internal thread on the fixing ring 2 engages with the external thread on the protrusion 11.

[0020] The protective structure also includes multiple blades 3, each with a through-hole 31 at its base. The blades 3 have a predetermined strength to ensure sufficient support for the rubber cylinder 91. Specifically, the blades 3 can be made of hard metal, such as stainless steel, iron, or titanium alloy. The blades 3 are arranged in a circumferential array along the circumference of the skeleton 1 and enclose a circular tubular structure. The blades 3 are sleeved onto the outside of the protrusions 11 through the through-holes 31, so that the blades 3 are arranged in a circumferential array within the annular space formed between the skeleton 1 and the fixing ring 2. The tops of the blades 3 face the same side of the skeleton 1. The blades 3 swing about the tangent of the skeleton 1 passing through the protrusions 11, and the sides of the blades 3 overlap with the sides of adjacent blades 3. The overlap referred to here means that the sides of adjacent blades 3 overlap during the swinging process. That is, whether the blades 3 are swung inward to the extreme position or opened outward to the extreme position, the sides of adjacent blades 3 overlap. The user can select an appropriate number of blades 3 for assembly according to the size of the skeleton 1. Blades 3 can be set on each protrusion 11, or blades can be set on some of the protrusions 11 at the same interval, as long as the sides of adjacent blades 3 are in an overlapping state.

[0021] When in use, the protective structure is sleeved on the end of the rubber cylinder 91. Specifically, the end of the rubber cylinder 91 is inserted into the circular hole formed by the blades 3. By swinging the blades 3, the inner surface of the blades 3 is fit against the outer wall of the rubber cylinder, and the end face of the rubber cylinder 91 contacts the end face of the skeleton 1, thereby limiting the end face of the rubber cylinder 91, and the central tube 92 of the packer is used to pass through the rubber cylinder 91 and the skeleton 1 at the same time, so that the combination of the protective structure and the rubber cylinder 91 is completed; in the process of downhole plugging, when the rubber cylinder 91 is expanded outward under pressure, the outward protruding part of its end will generate an extrusion force on the blades 3, thereby causing the blades 3 to swing outward and open, and the blades 3 are used to support the end of the rubber cylinder 91, and the outward protrusion of the end of the rubber cylinder 91 is limited to a predetermined space, thereby avoiding abnormal deformation of the end of the rubber cylinder 91 due to the outward protrusion, thereby improving the sealing and pressure bearing strength of the rubber cylinder 91. Furthermore, during the swinging process of the blades 3, the sides of adjacent blades 3 always remain in an overlapping state, thus avoiding the formation of gaps between adjacent blades 3. With this structure, even if the rubber tube 91 softens due to high temperature, the blades 3 can completely cover the end of the rubber tube 91, preventing the softened rubber tube 91 from being squeezed out and preventing the pressure of the rubber tube 91 from decreasing, thereby ensuring the sealing effect. The swinging structure design of the blades 3 allows it to adapt to rubber tubes 91 of different outer diameters, so that the protective structure of the same size can adapt to the use of rubber tubes 91 of more sizes. The fixing ring 2 is connected to the multiple protrusions 11 on the skeleton 1 through a threaded structure, which not only achieves the purpose of limiting the installation of the blades 3, but also makes the disassembly and assembly of the blades 3 more convenient, and can improve the overall structural strength of the skeleton 1.

[0022] Preferably, Figure 1 、 Figure 3 As shown, one side of the blade 3 is located outside the adjacent blade 3, and the other side of the blade 3 is located inside the adjacent blade 3, so that the blades 3 are arranged in a fish-scale pattern. As another structure, both sides of the blade 3 can also be set on the same side of the two adjacent blades 3, that is, when one blade 3 is located on the inside of the two adjacent blades 3, the two adjacent blades 3 will be on the outside of their respective adjacent blades 3, so that the blades 3 as a whole are arranged in an inside-outside staggered manner. Both of the above structures can enable the blades 3 to swing adaptively following the changes in the end of the rubber cylinder 91, thereby fully supporting the end of the rubber cylinder 91. However, in the first structural design, when one blade 3 swings, it can drive the other blades 3 to swing synchronously, and the swing direction and amplitude are the same.

[0023] Preferably, the overall structure of the blades 3 is a spherical structure to ensure the fit between the surfaces of adjacent blades 3 and reduce the gaps between them.

[0024] Preferably, Figures 1 to 3 As shown, the protective structure also includes an annular structure of tape 4, which is sleeved on the outside of the circular tube structure surrounded by the blades 3. When the tape 4 is in a natural state, the blades 3 are retracted toward the middle, so that the blades 3 can automatically adhere to the surface of the rubber tube 91 during assembly.

[0025] The above description is only a preferred embodiment of the present invention and does not represent the only embodiment or limit the present invention. It should be understood by those skilled in the art that various changes or equivalent replacements made to the present invention without departing from the scope of the present invention are within the scope of protection of the present invention.

Claims

1. A packer rubber sleeve end protection structure, characterized in that: It comprises: a skeleton (1) and a fixing ring (2), both of which are circular ring structures; The outer side wall of the skeleton (1) is provided with a plurality of protrusions (11) in a circumferential array, and the outer surface of the protrusion (11) has an external thread; The inner wall of the fixing ring (2) has an internal thread, and when the fixing ring (2) is coaxially connected to the frame (1), the internal thread on the fixing ring (2) meshes with the external thread on the protrusion (11); include, A plurality of blades (3) are provided with through holes (31) at their roots. The blades (3) have a predetermined strength. The blades (3) are arranged in an array along the circumference of the frame (1) and enclose a circular tube structure. The blades (3) are sleeved on the outside of the protrusion (11) through the through holes (31). The tops of the blades (3) face the same side of the frame (1). The blades (3) are swingably arranged with the tangent of the frame (1) passing through the protrusion (11) as an axis, and the side of the blade (3) overlaps the side of an adjacent blade (3).

2. A packer rubber sleeve end protection structure according to claim 1, characterized in that: One side of the blade (3) is located outside the adjacent blade (3), and the other side of the blade (3) is located inside another adjacent blade (3).

3. A packer rubber sleeve end protection structure according to claim 1 or 2, characterized in that: The overall structure of the blades (3) is a spherical structure.

4. A packer rubber sleeve end protection structure according to claim 1 or 2, characterized in that: It also includes an annular adhesive tape (4) which is sleeved on the outside of the circular tube structure formed by the blades (3).

5. The packer rubber sleeve end protection structure according to claim 1, characterized in that: The blades (3) are made of hard metal.

6. A packer rubber sleeve end protection structure according to claim 1, characterized in that: The frame (1) and the fixing ring (2) are both made of hard metal.

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