Deep well fracturing packer rubber sleeve

Abstract

The utility model relates to the technical field of oil field underground oil extraction tools, and discloses a deep well fracturing packer rubber sleeve, which comprises an outer layer flexible sealing ring, an inner layer flexible sealing ring, an inner layer flexible sealing ring and an outer layer flexible sealing ring, and the outer layer flexible sealing ring is used for adapting to the surface of a well wall and realizing sealing; the middle composite buffer layer is used for buffering external pressure and absorbing stress generated by expansion; the inner-layer rigid supporting framework is used for providing structural support and limiting the expansion range of the rubber sleeve; the outer layer flexible sealing ring is of a gradient type flexible protruding structure. According to the utility model, the outer-layer flexible sealing ring adapts to an irregular well wall and realizes tight sealing through a gradient structure and micro lines, the middle composite buffer layer absorbs external pressure and disperses expansion stress, the anti-fatigue capability of the rubber sleeve is enhanced, and the inner-layer rigid supporting framework controls deformation through the supporting ribs and the compensation grooves; and the long-term stability of the rubber sleeve under high-pressure and high-temperature conditions is ensured.

Description

Technical Field

[0001] This utility model relates to the field of downhole oil production tools, and in particular to a rubber sleeve for a deep well fracturing packer. Background Technology

[0002] Deep well fracturing technology is one of the key technologies in the oil and gas extraction industry, playing a crucial role, especially in the development of unconventional oil and gas resources. During fracturing, the packer sleeve, as the core component of the packer, is used to isolate different sections of the wellbore, ensuring that fracturing fluid can enter the formation along the designed path and achieve efficient fracturing operations. The packer sleeve needs to withstand complex expansion pressures in the high-temperature, high-pressure downhole environment, while also possessing excellent sealing performance, pressure buffering capacity, and long-term stability to meet the requirements of multiple fracturing cycles.

[0003] Traditional deep well fracturing packer sleeves typically have a simple structural design. They generally employ only a single layer or a simple composite structure. The outer sealing layer is mostly made of ordinary rubber, lacking special design for the irregular shape of the well wall, making it difficult to fit tightly to the well wall and resulting in poor sealing performance. The middle buffer layer material has limited elasticity and flexibility, failing to adequately buffer external pressure and effectively absorb expansion stress, making it prone to fatigue damage after repeated operations. The inner support structure often lacks rigidity or effective design to cope with high-temperature thermal expansion, making it unable to stably control the sleeve deformation under high pressure and high temperature environments, causing the sleeve to be prone to excessive deformation or even damage.

[0004] These problems result in poor sealing performance, short service life, and insufficient stability of traditional packers under complex deep well fracturing conditions, failing to meet the demands of modern oil extraction for high efficiency, durability, and safety. Therefore, a new type of packer packer for deep well fracturing is proposed to address these issues. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a deep well fracturing packer sleeve, which aims to improve the problems of poor sealing performance, short service life, and insufficient stability of traditional sleeves under complex deep well fracturing conditions, thus failing to meet the needs of modern oil extraction for high efficiency, durability, and safety.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a deep well fracturing packer sleeve, comprising:

[0007] An outer flexible sealing ring, which is used to adapt to the well wall surface and achieve a seal;

[0008] An intermediate composite buffer layer is used to buffer external pressure and absorb stress generated by expansion.

[0009] An inner layer rigid support framework is used to provide structural support and limit the expansion range of the rubber sleeve.

[0010] As a further description of the above technical solution:

[0011] The outer layer flexible sealing ring is provided as a gradient flexible convex structure, which is used to fit the irregular surface of the well wall and improve the contact stability.

[0012] As a further description of the above technical solution:

[0013] The intermediate composite buffer layer is composed of high-elasticity material and flexible material, which is used to provide flexible deformation and reduce fatigue damage when the rubber sleeve expands.

[0014] As a further description of the above technical solution:

[0015] The inner layer rigid support framework is provided as an annular framework structure, and radial support ribs are arranged on the inner layer rigid support framework, which are used to uniformly disperse the expansion pressure and enhance the support strength.

[0016] As a further description of the above technical solution:

[0017] The surface of the outer layer flexible sealing ring is provided with a micro-texture structure, which is used to enhance the friction and the fitting performance of the well wall.

[0018] As a further description of the above technical solution:

[0019] Radial compensation grooves are arranged between two adjacent support ribs, which are used to adjust the thermal expansion stress under high temperature conditions and maintain the stability of the inner layer rigid support framework.

[0020] As a further description of the above technical solution:

[0021] The inner wall of the intermediate composite buffer layer is provided with a plurality of reinforcing ribs at equal intervals.

[0022] As a further description of the above technical solution:

[0023] The outer layer flexible sealing ring, the intermediate composite buffer layer and the inner layer rigid support framework are arranged in an axial integration, which is used to realize the composite effect of sealing, pressure buffering and expansion support as a whole.

[0024] The utility model has the advantages of:

[0025] The utility model discloses a kind of deep well fracturing packer rubber tubes, including: outer layer flexible sealing ring, middle composite buffer layer, inner layer rigid support framework. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A perspective view of the deep well fracturing packer rubber tube is provided for the utility model;

[0027] Figure 2 A support rib structure diagram of the deep well fracturing packer rubber tube is provided for the utility model;

[0028] Figure 3 A micro-texture structure diagram of the deep well fracturing packer rubber tube is provided for the utility model;

[0029] Figure 4 A reinforcing rib structure diagram of the deep well fracturing packer rubber tube is provided for the utility model.

[0030] LEGEND:

[0031] 1, outer layer flexible sealing ring; 101, micro-texture structure; 2, middle composite buffer layer; 201, reinforcing rib; 3, inner layer rigid support framework; 301, support rib; 302, radial compensation groove. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0033] WITH REFERENCE Figures 1-4 An embodiment provided by the utility model: a deep well fracturing packer rubber tube, including:

[0034] Outer layer flexible sealing ring 1, outer layer flexible sealing ring 1 is used to adapt to well wall surface and realize sealing;

[0035] Middle composite buffer layer 2, middle composite buffer layer 2 is used to buffer external pressure and absorb stress generated by expansion;

[0036] Inner layer rigid support framework 3, inner layer rigid support framework 3 is used to provide structural support and limit the expansion range of rubber tube;

[0037] The outer layer flexible sealing ring 1, the intermediate composite buffer layer 2 and the inner layer rigid support framework 3 are arranged in axial integration, and are used for realizing the composite effect of sealing, pressure buffering and expansion support as a whole.

[0038] Specifically, the outer layer flexible sealing ring 1 is adapted to the surface morphology of the well wall and reliably seals the well wall and effectively blocks fluid leakage by virtue of the gradient flexible protrusions and micro-texture structure 101. The intermediate composite buffer layer 2 is deformed flexibly to buffer external pressure by virtue of the characteristics of the high-elasticity material and the flexible material, the overall structure is maintained stable by virtue of the multiple reinforcing ribs 201 on the inner wall, the stress generated by expansion is absorbed, and fatigue damage is reduced. The inner layer rigid support framework 3 uniformly disperses the expansion pressure by virtue of the annular framework structure and the radially distributed support ribs 301, adjusts the high-temperature thermal expansion stress by virtue of the radial compensation grooves 302 between the adjacent support ribs 301, and provides structural support and limits the expansion range of the rubber sleeve.

[0039] With reference to Figures 1-4 , the outer layer flexible sealing ring 1 is provided as a gradient flexible protrusion structure for fitting with the irregular surface of the well wall and improving the contact stability. The surface of the outer layer flexible sealing ring 1 is provided with a micro-texture structure 101 for enhancing the friction and the fitting performance with the well wall.

[0040] Specifically, the outer layer flexible sealing ring 1 is provided as a gradient flexible protrusion structure for fitting with the concave-convex irregular parts of the well wall surface, forming adaptive sealing. The gradient protrusions can cover different well wall shapes, enhancing the contact stability of the well wall. The surface of the outer layer flexible sealing ring 1 is provided with a micro-texture structure 101. The micro-texture provides additional friction when contacting the well wall, further enhancing the anti-slippage capability of the flexible sealing ring 1, and improving the fitting performance of the rubber sleeve with the well wall.

[0041] With reference to Figure 4 , the intermediate composite buffer layer 2 is composed of a high-elasticity material and a flexible material for providing flexible deformation and reducing fatigue damage when the rubber sleeve expands. The inner wall of the intermediate composite buffer layer 2 is provided with multiple reinforcing ribs 201 at equal intervals.

[0042] Specifically, the intermediate composite buffer layer 2 is composed of a high-elasticity material and a flexible material, providing flexible deformation capability during the expansion of the rubber sleeve, effectively relieving the direct impact of the expansion pressure on the structures of the rubber sleeve, absorbing the stress generated by expansion, avoiding local stress concentration, and reducing fatigue damage of the rubber sleeve in multiple fracturing operations. The multiple reinforcing ribs 201 provided at equal intervals on the inner wall of the intermediate composite buffer layer 2 strengthen the overall structural strength of the intermediate composite buffer layer 2 during high-pressure expansion, prevent uneven deformation caused by high pressure, and ensure the stability of the flexible deformation capability of the intermediate composite buffer layer 2 in long-term use.

[0043] Reference Figure 2 and Figure 4 The inner layer rigid support framework 3 is arranged in a ring framework structure, and support ribs 301 distributed in the radial direction are arranged on the inner layer rigid support framework 3, which are used to uniformly disperse the expansion pressure and enhance the support strength, and a radial compensation groove 302 is arranged between two adjacent support ribs 301, which is used to adjust the thermal expansion stress under high temperature conditions and maintain the stability of the inner layer rigid support framework 3.

[0044] Specifically, by arranging the inner layer rigid support framework 3 in a ring framework structure, the overall radial support capability is provided, which provides a stable support framework for the inside of the rubber sleeve during high-pressure expansion, prevents excessive deformation caused by high-pressure expansion, and ensures the shape retention and structural integrity of the rubber sleeve; by arranging the radial support ribs 301 on the inner layer rigid support framework 3, which cooperate with the ring framework structure, the external pressure is uniformly dispersed to the entire framework range during expansion, avoiding the concentration of pressure in a single part, thereby improving the carrying capacity and overall structural strength of the support framework; by arranging the radial compensation groove 302 between the support ribs 301, which cooperates with the support ribs 301, allows the framework structure to slightly expand under high temperature environment, releases the stress generated due to temperature rise, avoids deformation or cracking of the framework material caused by thermal expansion, and ensures the long-term stability of the inner layer rigid support framework 3 under high temperature conditions.

[0045] Working principle: when the deep well fracturing packer rubber sleeve starts to work, the outer layer flexible sealing ring first plays a role, the gradient flexible protrusion structure thereof can adaptively fit according to the irregular shape of the well wall, and the surface micro-texture structure 101 greatly enhances the friction between the well wall, ensuring that the sealing ring is tightly attached to the well wall, effectively blocking fluid leakage, and achieving reliable sealing; then, the intermediate composite buffer layer 2 responds to the external pressure, and the characteristics of being composed of high-elasticity material and flexible material enable it to flexibly deform, buffer the impact force from the outside, and the multiple reinforcing ribs 201 arranged equidistantly on the inner wall maintain the structural stability of the buffer layer during the buffering process, reducing fatigue damage caused by frequent deformation; at the same time, the inner layer rigid support framework 3 operates synchronously, relying on the ring framework structure and the radial distribution of the support ribs 301 to uniformly disperse the pressure generated during the expansion of the rubber sleeve, ensuring that the rubber sleeve has stable support during expansion, and the radial compensation groove 302 between the adjacent support ribs 301 adjusts the thermal expansion stress under high temperature environment, maintaining the stability of the framework itself. The three-layer structure is arranged in an axial integration, cooperates with each other, and cooperates to achieve the composite functions of sealing, buffering external pressure, and providing stable support for expansion, to meet the needs of complex working conditions of deep well fracturing.

[0046] It should be explained finally: above only is the preferred embodiment of the utility model and is not used for limiting the utility model, although the utility model has been explained in detail with reference to foregoing embodiment, for the skilled person in the art, it still can modify the technical scheme recorded in foregoing each embodiment or make equivalent replacement to part technical features, any modification, equivalent replacement, improvement etc. made within the spirit and principle of the utility model should be contained in the protection scope of the utility model.

Claims

1. A packer sleeve for deep well fracturing, characterized in that, include: An outer flexible sealing ring (1) is used to adapt to the well wall surface and achieve a seal; Intermediate composite buffer layer (2), the intermediate composite buffer layer (2) is used to buffer external pressure and absorb the stress generated by expansion; The inner rigid support frame (3) is used to provide structural support and limit the expansion range of the rubber tube.

2. The packer sleeve for deep well fracturing according to claim 1, characterized in that: The outer flexible sealing ring (1) is configured as a gradient flexible protrusion structure, which is used to fit with the irregular surface of the well wall and improve contact stability.

3. The packer sleeve for deep well fracturing according to claim 1, characterized in that: The intermediate composite buffer layer (2) is composed of highly elastic and flexible materials, and is used to provide flexible deformation and reduce fatigue damage when the rubber tube expands.

4. The packer sleeve for deep well fracturing according to claim 1, characterized in that: The inner rigid support frame (3) is configured as a ring frame structure, and radially distributed support ribs (301) are provided on the inner rigid support frame (3) to uniformly disperse the expansion pressure and enhance the support strength.

5. The packer sleeve for deep well fracturing according to claim 1, characterized in that: The outer flexible sealing ring (1) has a micro-textured structure (101) on its surface to enhance friction and fit to the well wall.

6. The packer sleeve for deep well fracturing according to claim 4, characterized in that: A radial compensation groove (302) is provided between two adjacent support ribs (301) to adjust thermal expansion stress under high temperature conditions and maintain the stability of the inner rigid support skeleton (3).

7. The packer sleeve for deep well fracturing according to claim 1, characterized in that: The inner wall of the intermediate composite buffer layer (2) is provided with multiple reinforcing ribs (201) at equal intervals.

8. The packer sleeve for deep well fracturing according to claim 1, characterized in that: The outer flexible sealing ring (1), the middle composite buffer layer (2) and the inner rigid support skeleton (3) are arranged in an axially integrated manner to achieve the combined functions of sealing, pressure buffering and expansion support.

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