All-metal hydraulic packer

Abstract

The utility model relates to the technical field of oil and gas exploitation downhole operation packers, in particular to an all-metal hydraulic packer. An extrusion plane (4) is arranged at the top end of the whole outer contact face of the metal sealing cylinder (5), and the extrusion plane (4) can increase the contact area of the metal sealing cylinder (5) and the well wall. Compared with the prior art, the extrusion fixing device has the following beneficial effects that compared with the prior art of CN116816299A, point contact is creatively changed into surface contact, and the extrusion fixing effect is better. And stability is achieved, and sliding caused by large pressure is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil and gas exploitation downhole operation packer technical field especially relates to a full -metal hydraulic packer. BACKGROUND

[0002] As a key tool in downhole, packer plays an irreplaceable important role in the field of oil and gas exploitation.

[0003] From the functional point of view, packer has multiple key functions. It can effectively separate different oil, gas, water layers in downhole, prevent interlayer fluid from mutual interference. In the complex downhole environment, the pressure and fluid properties between layers are different, if there is no packer isolation, it may lead to oil in oil layer being polluted by water or gas, affect the quality and exploitation efficiency of crude oil. At the same time, packer can accurately control downhole pressure, seal wellbore, ensure the stability of pressure in the operation process, provide safe and reliable pressure environment for subsequent fracturing, acidizing and other stimulation measures.

[0004] In terms of structural design, the design of packer is very ingenious and complex. It is usually composed of setting mechanism, sealing mechanism, unsetting mechanism and other parts. Setting mechanism can make packer firmly fixed at the predetermined downhole position, ensure the realization of its sealing performance. Sealing mechanism adopts special rubber material or metal sealing element, which can maintain good sealing effect under the harsh downhole conditions of high temperature, high pressure and high corrosion, prevent fluid leakage. Unsetting mechanism is convenient for taking out the packer from downhole after the operation is completed, so as to carry out subsequent operation or equipment replacement.

[0005] In practical application, the importance of packer is self-evident. In the completion operation of oil well, the correct use of packer can improve the yield and life of oil well. By separating different properties of oil layer, separate layer exploitation can be realized, and corresponding exploitation measures can be taken according to the characteristics of each layer, so as to maximize the recovery rate of crude oil. In water injection, gas injection and other stimulation operations, packer can accurately deliver injected water or gas to the target layer, improve injection effect and improve the exploitation conditions of oil reservoir.

[0006] Packer, with its excellent function, ingenious structure and important role in practical application, deserves to be the key tool in downhole, which has great significance for efficient development and safe production of oil and gas field.

[0007] CN116816299A discloses a full-metal sealing packer and a sealing performance and structural strength prediction method.

[0008] The high-temperature and high-pressure working environment puts higher requirements on the reliability of the packer. With the continuous advancement of global oil and gas exploration and development into deep and ultra-deep areas, the proportion of reservoirs with a burial depth of more than 4500 meters has exceeded 60%, the temperature gradient in the downhole generally reaches 3.5-4.5℃ / 100m, and the pressure coefficient breaks through 1.8-2.2, which poses a severe challenge to the temperature and pressure resistance of downhole tools. For a long time, the traditional rubber packer rubber tube is restricted by material aging and other factors in high-temperature and high-pressure environments, and its performance attenuation curve presents obvious stage characteristics: below 150℃, nitrile rubber can still maintain a compression resilience rate of more than 90%; but when the temperature breaks through 180℃, the crosslinking network is destroyed due to the accelerated movement of molecular chains, and the elastic modulus decreases by 40%-50%, while the high-pressure environment accelerates the stress relaxation process, and the sealing contact stress attenuation rate increases by 3-5 times. Experimental data shows that under the complex working condition of 200℃ / 70MPa, the service life of conventional rubber seals is less than 72 hours, which seriously restricts the production time of deep oil and gas fields.

[0009] The innovative application of the all-metal sealing packer provides a breakthrough solution to this technical bottleneck.

[0010] However, in the technology of CN116816299A, the contact between the metal sealing cylinder 5 and the well wall is only one point, the locking area is too small, and the sealing performance is not good.

[0011] On March 1, 2025, a search was conducted in the China Patent Public Database with "metal and cylinder and (packer or seal) and plane and downhole" as the abstract keywords, and the "allow synonym expansion" box was checked. CN202410926575.X was found.

[0012] The downhole automatic build-up device for high-temperature complex difficult-to-drill formations has nothing to do with this patent.

[0013] On March 1, 2025, an abstract search was conducted on China National Knowledge Infrastructure with "metal and cylinder and (packer or seal) and plane and downhole". The doctoral thesis of Yang Yiwie of China University of Petroleum (Beijing): "Research on Radial Metal Sealing Technology of Downhole Flow Control Valve", has nothing to do with this patent.

[0014] On March 1, 2025, a search was conducted in the China Patent Public Database with "metal and cylinder with (packer or sealing) withA search for "metal cylinder and (packer or sealing) and planar interface" on the USPTO website, at https: / / ppubs.uspto.gov / pubwebapp / , did not reveal any relevant documents.

[0015] A search for "metal cylinder and (packer or sealing) and planar interface" on the WIPO website, at https: / / patentscope2.wipo.int / , on March 1, 2025, did not reveal any relevant documents.

[0016] A search for "metal cylinder and (packer or sealing) and planar interface" on the JPO website, at https: / / www.j-platpat.inpit.go.jp / , on March 1, 2025, did not reveal any relevant documents.

[0017] The present patent is improved based on CN116816299A, and part of the unexpressed content can be cited and referred to CN116816299A. Content of the utility model

[0018] The utility model aims at providing a full-metal hydraulic packer with better effects, and specific purposes are shown in multiple substantial technical effects in the specific implementation part.

[0019] In order to achieve the above purposes, the utility model adopts the following technical solutions:

[0020] A full-metal hydraulic packer, the full-metal sealing packer comprises a packer center pipe, one end of the packer center pipe is connected with an upper joint, and the upper joint is connected with a tubing string; wherein, an adjusting ring, a protective push ring, a metal sealing cylinder 5, a limiting protector ring, a cone, a slip, a slip seat, a slip seat sleeve, a connecting cylinder, a centralizing block, a pressing sleeve and a slip ring are sequentially sleeved on the packer center pipe, an inner wall of the metal sealing cylinder is in contact with the packer center pipe, an upper end of the metal sealing cylinder is connected with the protective push ring, and a lower end of the metal sealing cylinder is limited by the limiting protector ring; the cone is limited by a shoulder on the packer center pipe, and the slip is installed on the slip seat through a slip clamping ring; a spring is installed on the packer center pipe and is installed between the slip and the slip seat, and the full-metal sealing cylinder 5 comprises an extrusion plane 4 on a top end of an outer contact surface of the full-metal sealing cylinder 5, and the extrusion plane 4 can increase a contact area of the full-metal sealing cylinder 5 and a well wall.

[0021] The utility model further has a technical solution that an outward face of the extrusion plane 4 is a friction face.

[0022] The further technical scheme of the utility model lies in that the extrusion plane 4 is integrally made on the metal sealing cylinder 5.

[0023] The further technical scheme of the utility model lies in that the extrusion plane 4 is integrally made on the metal sealing cylinder 5.

[0024] The further technical scheme of the utility model lies in that the extrusion plane 4 is integrally made on the metal sealing cylinder 5.

[0025] The further technical scheme of the utility model lies in that the extrusion plane 4 is integrally made on the metal sealing cylinder 5.

[0026] The utility model has the advantages that compared with the prior art, the utility model changes point contact into surface contact, and the extrusion fixing effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to further illustrate the utility model, the following further illustrates in combination with the drawings:

[0028] Figure 1 One of the expansion plane extrusion embodiments of the utility model;

[0029] Figure 2 The second expansion plane extrusion embodiment of the utility model;

[0030] Figure 3 The third expansion plane extrusion embodiment of the utility model;

[0031] 1. Protection push ring; 2. Center tube; 3. Medium; 4. Extrusion plane; 5. Metal sealing cylinder; 6. Limiting guard ring. DETAILED DESCRIPTION

[0032] The utility model is further illustrated below in combination with the drawings and specific embodiments, and it should be understood that the following specific embodiments are only used to illustrate the utility model and not used to limit the scope of the utility model. In the description of the utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", "bottom" and the like is based on the orientation or position relationship shown in the drawings, and is only used to facilitate the description of the utility model and simplify the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0033] It should be noted that in this paper, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0034] The present patent provides a variety of parallel schemes, and different expressions belong to improved schemes or parallel schemes based on the basic scheme. Each scheme has its own unique characteristics. In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict between them. The fixing mode not described in the text can be any one of the fixing modes such as screw fixing, bolt fixing or glue bonding.

[0035] Embodiment one: in combination with all the drawings; a full metal hydraulic packer, the full metal sealing packer comprises a packer center tube, one end of the packer center tube is connected with an upper joint, the upper joint is connected with a tubing string; wherein, the packer center tube is sequentially sleeved with an adjusting ring, a protective push ring, a metal sealing cylinder 5, a limiting protector ring, a cone, a slip, a slip seat, a slip seat sleeve, a connecting cylinder, a centralizer, a pressing sleeve, a sliding ring, the inner wall of the metal sealing cylinder is in contact with the packer center tube, the upper end of the metal sealing cylinder is connected with the protective push ring, the lower end of the metal sealing cylinder is limited by the limiting protector ring; the cone is limited by the shoulder on the packer center tube, the slip is installed on the slip seat through the slip clamp ring; the packer center tube is installed with a spring, the spring is installed between the slip and the slip seat, characterized in that the top end of the overall outer contact surface of the metal sealing cylinder 5 comprises an extrusion plane 4, the extrusion plane 4 can increase the contact area of the metal sealing cylinder 5 and the well wall. The substantial technical effects and implementation process of the technical solution here are as follows: compared with the prior art of CN116816299A, this patent innovatively changes the point contact to the surface contact, the extrusion fixing effect is better. And stable, will not slide because of large pressure.

[0036] Embodiment two: as a further improved scheme or parallel scheme or alternative independent scheme, the outward face of the extrusion plane 4 is a friction surface. The substantial technical effects and implementation process of the technical solution here are as follows: thus the friction force of contact with the well wall can be increased. The friction surface can be a rough surface.

[0037] Embodiment two: as a further improved scheme or parallel scheme or alternative independent scheme, the extrusion plane 4 is integrally made on the metal sealing cylinder 5. The substantial technical effects and implementation process of the technical solution here are as follows: thus the integrity is better. It can be made by sheet metal processing.

[0038] Embodiment three: as a further improved scheme or parallel scheme or alternative independent scheme, the extrusion plane 4 is located at the most protruding position of the metal sealing cylinder 5 extending from the center to the side. The substantial technical effects and implementation process of the technical solution here are as follows: at the highest point of the arc line.

[0039] Embodiment four: as a further improved scheme or parallel scheme or alternative independent scheme, the extrusion plane 4 is arranged on the metal sealing cylinder 5 as a outward extrusion reinforcing rib. The substantial technical effects and implementation process of the technical solution here are as follows: thus the overall strength is better.

[0040] Embodiment five: as a further improvable scheme or parallel scheme or alternative independent scheme, the extrusion plane 4 contains more than one and is arranged up and down. The substantial technical effect and its implementation process of the technical scheme here are as follows: thus the extrusion fixing effect is better.

[0041] Pioneeringly, the above various effects exist independently, and the combination of the above results can also be completed with one set of structure.

[0042] It should be noted that the modules of the patent are integrated with the modules of the prior art, and do not involve new modules. Even if part of the module uses a program, the program is undoubtedly a known program.

[0043] The basic principle, main features and advantages of the utility model are shown and described above. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principle of the utility model, and various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of protection.

Claims

1. A full metal hydraulic packer, the full metal sealing packer comprising a packer central pipe, one end of the packer central pipe being connected with an upper joint, the upper joint being connected with a tubing string; wherein, The adjusting ring, the protection push ring, the metal sealing cylinder (5), the limiting protection ring, the cone, the slip, the slip seat, the slip seat cover, the connecting cylinder, the centralizer, the pressing sleeve and the sliding ring are sequentially sleeved on the packer central tube, the inner wall of the metal sealing cylinder is in contact with the packer central tube, the upper end of the metal sealing cylinder is connected with the protection push ring, the lower end of the metal sealing cylinder is limited by the limiting protection ring, the cone is limited by the shoulder on the packer central tube, the slip is installed on the slip seat through the slip clamp ring, the spring is installed on the packer central tube and is installed between the slip and the slip seat, and the whole outer contact surface of the metal sealing cylinder (5) is provided with an extrusion plane (4), which can increase the contact area between the metal sealing cylinder (5) and the well wall.

2. A full metal hydraulic packer as defined in claim 1, wherein, The outward face of the extrusion plane (4) is a friction face.

3. A full metal hydraulic packer as defined in claim 1, wherein, The extrusion plane (4) is integrally made on the metal sealing cylinder (5).

4. A full metal hydraulic packer as defined in claim 1, wherein, The extrusion plane (4) is located at the most protruding position of the metal sealing cylinder (5) extending from the center to the side.

5. A full metal hydraulic packer as defined in claim 1, wherein, The extrusion plane (4) is arranged on the metal sealing cylinder (5) as a reinforcing rib extruding outward.

6. A full metal hydraulic packer as defined in claim 1, wherein, The extrusion plane (4) contains more than one and is arranged upward and downward.

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