Packer and movable pressing cap-protective cap protruding prevention assembly thereof

Abstract

The invention provides a packer and a movable pressing cap-protective cap protruding prevention assembly thereof.The movable pressing cap-protective cap protruding prevention assembly of the packer comprises an integrated pressing cap protruding prevention piece and a split type protective cap protruding prevention piece which are both arranged at the two ends of a rubber barrel, and the integral pressing cap protruding prevention piece and the split type protective cap protruding prevention piece are arranged on the rubber barrel. The integral type pressing cap anti-protruding piece is located between the supporting ring of the rubber barrel and the split type protective cap anti-protruding piece; a slide way is arranged on the integral pressing cap anti-protruding piece; the split type protective cap protruding prevention piece comprises a plurality of petal-shaped bodies arranged in the circumferential direction, each petal-shaped body is provided with a sliding block, each sliding block is provided with a roller, and the sliding blocks can move in the radial direction of the sliding way. The packer can comprise the movable pressing cap-protecting cap protruding prevention assembly. The packer rubber sleeve has the beneficial effect that the sealing performance of the packer rubber sleeve can be improved.

Description

Technical Field

[0001] This invention relates to the field of downhole tool manufacturing technology in the oil and gas industry, specifically to a packer and its movable pressure cap-protective cap anti-protrusion assembly. Background Technology

[0002] China possesses abundant deep and ultra-deep oil and gas resources, making deep oil and gas reservoirs a key area for exploration and development in China. For example, the Dengying Formation of the Seidan System in the Sichuan Basin has total oil and gas resources of 2.8–3 trillion cubic meters, buried at depths of 6,000–10,000 meters, with approximately half of the resources located at depths of 8,000–10,000 meters. Current oil and gas exploration and development are increasingly concentrated in deep and ultra-deep wells, leading to increasingly higher temperatures and pressures on packer sleeves, which places higher demands on their performance. Therefore, providing a packer and its movable pressure cap-protective cap anti-protrusion assembly is of great significance.

[0003] Chinese patent application number "CN202020844967.9" entitled "A Downhole Packer Sealing Structure" discloses a downhole packer sealing structure, which includes a casing. A middle rubber sleeve is movably sleeved on the outer side of the upper center position of the casing. Side rubber sleeves are movably sleeved on both sides of the middle rubber sleeve on the outer side of the casing. A first back ring is movably sleeved on the side of the side rubber sleeve away from the middle rubber sleeve at the outer end position of the casing. A set of protective back rings is installed on both sides of the rubber sleeve. These include a first back ring made of heat-shrinkable material, a second back ring made of steel wire, a third back ring made of brass, and a fourth back ring made of low-carbon steel. After compression, the back rings deform and fit tightly against the inner wall of the casing, forming a bowl-shaped protective structure. This prevents leakage from the middle and side rubber sleeves under high temperature and pressure differential conditions, thus preventing seal failure. The entire device withstands high temperature and pressure; most importantly, it prevents leakage from the middle and side rubber sleeves at high temperatures and maintains sufficient positive pressure to ensure an effective seal. However, the sealing structure of this downhole packer differs from that of this application. Its back ring is an integral piece and cannot move radially along the compression trajectory of the rubber sleeve to completely protect it.

[0004] Chinese patent application number CN202320633002.9, entitled "A Multi-Layer Slotted High-Strength Back Ring," discloses a multi-layer slotted high-strength back ring, comprising a metal body and multiple back rings. The head of the multi-layer back ring is an integral part of the body, and after being divided into multiple independent individuals at the shoulder, it extends to the tail. The multi-layer back ring has a conical structure, which expands outward and closes to the casing wall or open hole wall when subjected to axial pressure. It can effectively protect the rubber sealing components when sealing irregular gaps between the tubing and the open hole wall, especially when the ring is too large, as it continuously expands and closes to the casing wall or open hole wall after compression. This solves the problem that existing back rings cannot meet the requirements of ultra-high temperature and ultra-high pressure, thus failing to effectively protect the rubber sealing components. However, the structure of the multi-layer slit high-strength back ring is different from that of this application. It adopts a segmented back ring. When the rubber tube is compressed, the back ring opens effectively, but it cannot move with the radial expansion of the rubber tube. Similarly, it cannot completely cover and protect the rubber tube, and there is no flow channel on its surface to enhance the compression of the rubber tube. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to solve one or more problems existing in the prior art. For example, one objective of this invention is to provide a movable pressure cap-protecting cap anti-protrusion assembly for packers that can improve the sealing performance of packer sleeves.

[0006] To achieve the above objectives, the present invention provides a movable pressure cap-protective cap anti-protrusion assembly for a packer. The protective cap anti-protrusion assembly may include an integral pressure cap anti-protrusion component and a segmented protective cap anti-protrusion component. Both the integral pressure cap anti-protrusion component and the segmented protective cap anti-protrusion component are disposed at both ends of the rubber tube. The integral pressure cap anti-protrusion component is located between the support ring of the rubber tube and the segmented protective cap anti-protrusion component. The integral pressure cap anti-protrusion component is provided with a slide rail. The segmented protective cap anti-protrusion component includes a plurality of circumferentially arranged petal-shaped bodies. Each petal-shaped body is provided with a slider, and a roller is provided on the slider. The slider can move radially along the slide rail.

[0007] According to an exemplary embodiment of one aspect of the present invention, both the integral pressure cap anti-protrusion member and the segmented protective cap anti-protrusion member can be provided with multi-hole channels.

[0008] According to an exemplary embodiment of one aspect of the present invention, each of the valve bodies may be provided with 4 to 20 channels.

[0009] According to an exemplary embodiment of one aspect of the present invention, the integral pressure cap anti-protrusion member may be provided with 20 to 100 holes.

[0010] According to an exemplary embodiment of one aspect of the present invention, the porous channels on the integral pressure cap anti-protrusion member can be uniformly arranged circumferentially.

[0011] According to one exemplary embodiment of the present invention, the porous channel may include a circular hole.

[0012] According to an exemplary embodiment of one aspect of the present invention, the slide may include a trapezoidal slide.

[0013] According to an exemplary embodiment of one aspect of the present invention, the segmented protective cap anti-protrusion member may include 4 to 12 evenly distributed segments.

[0014] According to an exemplary embodiment of one aspect of the present invention, the slider may be provided with 1 to 5 rollers.

[0015] Another aspect of the present invention provides a packer that may include the packer movable pressure cap-protecting cap anti-protrusion assembly as described above.

[0016] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0017] (1) The movable pressure cap-protective cap anti-protrusion component of the packer proposed in this invention can solve the problems that the existing packer rubber sleeve protection ring structure cannot expand and cannot completely wrap the rubber sleeve to avoid the shoulder protrusion phenomenon.

[0018] (2) The composite protective ring structure of the packer proposed in this invention provides a technical approach for the future optimization and upgrading of packer structures. Attached Figure Description

[0019] The above and other objects and features of the present invention will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A schematic diagram of the structure of the movable pressure cap-protective cap anti-protrusion assembly for the packer of the present invention is shown;

[0021] Figure 2 A schematic diagram of the integral pressure cap anti-protrusion member of the present invention is shown;

[0022] Figure 3 A schematic diagram of the structure of the segmented protective cap anti-protrusion member of the present invention is shown;

[0023] Figure 4 A schematic diagram of the slide structure of the present invention is shown.

[0024] Explanation of key figure labels:

[0025] 1-Central tube, 2-Support ring, 3-Integral pressure cap anti-protrusion part, 4-Segmented protective cap anti-protrusion part, 5-Rubber cylinder, 6-Roller, 7-Trapezoidal slide, 8-Slider. Detailed Implementation

[0026] In the following description, a packer of the present invention and its movable pressure cap-protecting cap anti-protrusion assembly will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0027] In the description of this application, it should be understood that the terms "middle," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] Exemplary Example 1

[0029] This exemplary embodiment provides a packer movable pressure cap-protector anti-protrusion assembly.

[0030] Figure 1 A schematic diagram of the structure of the movable pressure cap-protective cap anti-protrusion assembly for the packer of the present invention is shown; Figure 2 A schematic diagram of the integral pressure cap anti-protrusion member of the present invention is shown; Figure 3 A schematic diagram of the structure of the segmented protective cap anti-protrusion member of the present invention is shown; Figure 4 A schematic diagram of the slide structure of the present invention is shown below. (The following is in conjunction with...) Figures 1 to 4 The packer movable pressure cap is used to describe this exemplary embodiment.

[0031] like Figures 1-4 As shown, a movable pressure cap-protective cap anti-protrusion assembly for a packer may include an integral pressure cap anti-protrusion component 3 and a segmented protective cap anti-protrusion component 4. Anti-protrusion is achieved by combining the integral pressure cap anti-protrusion component and the segmented protective cap anti-protrusion component, with the segmented protective cap anti-protrusion component conforming to the movement of the rubber sleeve during compression and deformation.

[0032] The integral cap anti-protrusion component 3 and the segmented cap anti-protrusion component 4 are both located at both ends of the rubber cylinder 5. The integral cap anti-protrusion component 3 is located between the support ring 2 of the rubber cylinder 5 and the segmented cap anti-protrusion component 4. The integral cap anti-protrusion component 3 is provided with a slide rail. The segmented cap anti-protrusion component 4 includes several circumferentially arranged petal-shaped bodies, each petal-shaped body is provided with a slider 8, and several rollers 6 can be provided in the slider 8. The slider 8 can move radially along the slide rail. The movable cap-cap anti-protrusion assembly for packers proposed in this invention can be used to protect the rubber cylinder of high-temperature and high-pressure packers. When the packer is set, the support ring transmits the setting force to the integral cap anti-protrusion component. The integral cap anti-protrusion component compresses the segmented cap anti-protrusion component, and the segmented cap anti-protrusion component axially compresses the rubber cylinder. The rubber cylinder is axially compressed and deformed and expands radially. The petal-shaped bodies of the segmented cap anti-protrusion component move radially with the compression and deformation of the rubber cylinder to achieve radial expansion.

[0033] In this exemplary embodiment, the segmented protective cap anti-protrusion member may include 4 to 12 evenly distributed segments.

[0034] In this exemplary embodiment, as Figure 1 and Figure 4 As shown, the slide rails on the integral pressure cap anti-protrusion member 3 may include trapezoidal slide rails 7, with a right-angled trapezoidal cross-section. The width of the slide rail gradually increases radially along the central tube 1. Under the force of the rubber sleeve 5, the roller 6 can move radially along the slide rail, but will not slide out of the slide rail. The number of slide rails provided is consistent with the number of sliders on the segmented protective cap anti-protrusion member.

[0035] In this exemplary embodiment, each segment of the segmented protective cap anti-protrusion member may be provided with a slider, and one to five rollers may be placed in the slider. This facilitates the expansion of the segmented protective cap anti-protrusion member as the rubber sleeve expands radially.

[0036] Furthermore, the slider may include a square slider.

[0037] In this exemplary embodiment, both the integral pressure cap anti-protrusion member and the segmented protective cap anti-protrusion member can be provided with porous channels. A small amount of high-pressure fluid entering the porous channels facilitates further compression of the rubber sleeve and allows the segmented protective cap anti-protrusion member to enclose the rubber sleeve, thereby improving the sealing performance and anti-protrusion performance of the rubber sleeve.

[0038] Furthermore, depending on the size of the rubber sleeve and the size of the anti-protrusion component, each segment of the segmented cap anti-protrusion component can be provided with 4 to 20 channels; the integral cap anti-protrusion component can be provided with 20 to 100 channels. The multi-channels on the integral cap anti-protrusion component can be evenly arranged along its circumferential direction, for example, arranged in 4 groups along its circumferential direction.

[0039] Furthermore, the porous channels on the integral pressure cap anti-protrusion member and the segmented protective cap anti-protrusion member may include round holes.

[0040] Exemplary Example 2

[0041] This exemplary embodiment provides a packer that may include the packer movable pressure cap-protective cap anti-protrusion assembly described in Exemplary Embodiment 1 above.

[0042] In this exemplary embodiment, the method / process of using the packer may include:

[0043] During packer setting, the support ring transmits the setting force to the integral pressure cap anti-protrusion component. The integral pressure cap anti-protrusion component has a trapezoidal slide, which further compresses the segmented protective cap anti-protrusion component. The rollers on the segmented protective cap anti-protrusion component move radially along the trapezoidal slide and axially compress the sealing rubber sleeve. The sealing rubber sleeve undergoes axial compression deformation and expands radially. There is significant friction between the segmented protective cap anti-protrusion component and the sealing rubber sleeve; therefore, the segments of the segmented protective cap anti-protrusion component move radially as the sealing rubber sleeve is compressed and deformed, achieving radial expansion and thus covering the deformed sealing rubber sleeve. Both the integral pressure cap anti-protrusion component and the segmented protective cap anti-protrusion component have porous channels. A small amount of high-pressure fluid passing through these channels can further compress the surface of the sealing rubber sleeve, improving its sealing performance.

[0044] In summary, the advantages proposed by this invention include at least one of the following:

[0045] (1) The movable pressure cap-protective cap anti-protrusion assembly for packers proposed in this invention can be used to protect the rubber sleeve of high temperature and high pressure packers.

[0046] (2) The movable pressure cap-protective cap anti-protrusion component of the packer proposed in this invention can solve the technical problem that the back ring or protective ring in the compression type of the rubber tube cannot completely protect the rubber tube under compression.

[0047] (3) The packer proposed in this invention is applicable to the completion and development of deep and ultra-deep wells.

[0048] Although a packer and its movable pressure cap-protecting cap anti-protrusion assembly have been described above in conjunction with exemplary embodiments, those skilled in the art will understand that various modifications and changes can be made to the exemplary embodiments of the invention without departing from the spirit and scope defined by the claims.

Claims

1. A movable pressure cap-protective cap anti-protrusion assembly for a packer, characterized in that, The cap anti-protrusion assembly includes an integral cap-pressing anti-protrusion component and a segmented cap anti-protrusion component, wherein... Both the integral cap anti-protrusion component and the segmented cap anti-protrusion component are located at both ends of the rubber tube. The integral cap anti-protrusion component is located between the support ring of the rubber tube and the segmented cap anti-protrusion component. The integral pressure cap anti-protrusion component is equipped with a slide rail; the segmented protective cap anti-protrusion component includes several circumferentially arranged segmented bodies, each segmented body is equipped with a slider, the slider is equipped with a roller, and the slider can move radially along the slide rail.

2. The movable pressure cap-protective cap anti-protrusion assembly for the packer according to claim 1, characterized in that, Both the integral pressure cap anti-protrusion component and the segmented protective cap anti-protrusion component are provided with multi-hole channels.

3. The movable pressure cap-protective cap anti-protrusion assembly for the packer according to claim 2, characterized in that, Each of the valves is provided with 4 to 20 channels.

4. The movable pressure cap-protective cap anti-protrusion assembly for packers according to claim 2, characterized in that, The integral pressure cap anti-protrusion component is provided with 20 to 100 holes.

5. The movable pressure cap-protective cap anti-protrusion assembly for the packer according to claim 2, characterized in that, The multi-hole channels on the integral pressure cap anti-protrusion component are evenly arranged circumferentially.

6. The movable pressure cap-protective cap anti-protrusion assembly for the packer according to claim 2, characterized in that, The porous channel includes circular holes.

7. The movable pressure cap-protective cap anti-protrusion assembly for packers according to claim 1, characterized in that, The slide includes a trapezoidal slide.

8. The movable pressure cap-protective cap anti-protrusion assembly for packers according to claim 1, characterized in that, The segmented protective cap anti-protrusion component comprises 4 to 12 evenly distributed segments.

9. The movable pressure cap-protective cap anti-protrusion assembly for packers according to claim 1, characterized in that, The slider is equipped with 1 to 5 rollers.

10. A packer, characterized in that, The packer includes a movable pressure cap-protective cap anti-protrusion assembly as described in any one of claims 1 to 9.

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