Sealing technology form-conical surface metal seal for casing mud line suspension system

Abstract

The invention discloses a sealing technology form, namely a conical surface metal seal, for a casing mud line suspension system, and relates to the technical field of casing mud line suspension systems, which comprises an outer casing, an inner casing I mounted in the outer casing and an inner casing II mounted in the inner casing I, the sealing technology form, namely the conical surface metal seal, for the casing mud line suspension system further comprises a fastening device installed on the outer casing. The fastening device comprises a fastening mechanism and a pushing mechanism; wherein the fastening mechanism comprises a fastening plate, a connecting block fixedly installed on the fastening plate, an inclined plane ring fixedly installed on the connecting block, a matching ring fixedly installed on the outer sleeve and a first inclined plane block fixedly installed on the matching ring, and when the inclined plane ring moves along the inclined plane of the first inclined plane block, the fastening plate is driven to start to move synchronously; and the outer sleeve is gradually close to the outer sleeve until the outer sleeve is completely clamped, so that the contact surface of the conical surface metal sealing device can be helped to keep good contact pressure.

Description

Technical Field

[0001] This invention relates to the field of casing mudline suspension system technology, specifically to a sealing technology for casing mudline suspension systems - a conical metal seal. Background Technology

[0002] Conical metal seals are a common sealing technology used in casing mudline suspension systems, primarily for sealing needs in drilling operations such as oil and gas wells and geothermal wells. They achieve a sealing effect through the contact of opposing conical surfaces of metal materials under a certain compressive force.

[0003] Patent publication number CN222879659U relates to the technical field of casing mudline suspension systems. It includes an outer casing hanger body fixed to a water-tight conduit via a first placement shoulder, a middle casing hanger body fixed to the outer casing hanger body via a second placement shoulder, and an inner casing hanger body fixed to the middle casing hanger body via a ratchet buckle. The upper parts of both the outer and middle casing hanger bodies are sealed to their lowering tools using metal plating and metal sealing rings. The upper part of the inner casing hanger body is sealed to its lowering tool using an arc-shaped conical double-V metal sealing structure. Through a rationally designed structural layout, sealing configuration, material selection, and thread engagement length, the mudline suspension system is well-suited for harsh environments with high temperature and pressure, effectively improving overall strength and connection reliability.

[0004] The above solution, through the design of a reasonable structural layout, sealing settings, material selection and thread engagement length, enables the mudline suspension system to be well-suited for harsh environments with high temperature and high pressure, and effectively improves the overall strength and connection reliability. However, the above solution has the problem that it is difficult to tighten the entire device during operation, which can easily cause the device to loosen during operation. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a sealing technology for casing mudline suspension systems—a conical metal seal—which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a sealing technology form for a casing mudline suspension system - a conical metal seal, which includes an outer sleeve, an inner sleeve one installed inside the outer sleeve, and an inner sleeve two installed inside the inner sleeve one. The sealing technology form for a casing mudline suspension system - a conical metal seal further includes: a fastening device installed on the outer sleeve. The fastening device includes a fastening mechanism for fastening the outer sleeve when the overall device is in operation, and a pushing mechanism for moving the fastening mechanism to start working when operation begins. The fastening mechanism includes a fastening plate, a connecting block fixedly mounted on the fastening plate, a beveled ring fixedly mounted on the connecting block, a mating ring fixedly mounted on the outer sleeve, and a beveled block one fixedly mounted on the mating ring. After the device is installed in place, the electric telescopic rod is activated, causing the electric telescopic rod to push the top ring to start moving. When the top ring moves, it drives the vertical plate to start moving. The movement of the vertical plate drives the elastic telescopic rod one to start moving synchronously. When the elastic telescopic rod one moves, it drives the fastening plate to start moving in the same direction. The movement of the fastening plate drives the connecting block to start moving synchronously. The movement of the connecting block drives the beveled ring to start moving. The beveled ring moves and contacts the beveled block one and starts moving along its beveled extension direction. When the beveled ring moves along the beveled surface of the beveled block one, it drives the fastening plate to start moving synchronously.

[0007] The pushing mechanism includes a fixed ring, an electric telescopic rod disposed on the fixed ring, a top ring fixedly installed at the output end of the electric telescopic rod, a vertical plate fixedly installed on the top ring, and an elastic telescopic rod fixedly installed on the vertical plate. The setting of the pushing mechanism ensures that the fastening mechanism can move smoothly to perform fastening work during operation.

[0008] The movable end of the elastic telescopic rod is fixedly connected to the fastening plate. The inclined ring and the inclined block are both set as inclined surfaces on their sides. The fixed connection ensures that the movable end of the elastic telescopic rod can drive the fastening plate to move synchronously when it moves. The inclined surface ensures that the inclined ring can move smoothly along the inclined surface when it moves.

[0009] The sealing technology for the casing mudline suspension system - conical metal seal - also includes a protective device installed on the outer casing; The protective device is used to effectively protect the fastening device when the whole device is in operation, and to provide a simple seal for the area of ​​the fastening device. The installation of protective devices ensures that the fastening devices can be effectively protected during operation, thus ensuring the stability of the device during operation.

[0010] The protective device includes a guide block fixedly installed on the circumferential surface of a fixed ring, a protective plate slidably installed on the guide block, a first inclined plate fixedly installed on the protective plate, a sealing plate fixedly installed on the outer sleeve, a drive ring set on the outer sleeve, a passive ring fixedly installed on the output end of the drive ring, a fixed block fixedly installed on the passive ring, and a second inclined plate fixedly installed on the fixed block. When the top ring is started to move by the electric telescopic rod, the drive ring starts to start moving synchronously with the electric telescopic rod. The drive ring starts to drive the passive ring to start rotating. The rotation of the passive ring drives the fixed block to start rotating synchronously. At the same time, when the fixed block rotates, it drives the second inclined plate to start rotating synchronously. When the second inclined plate rotates, it contacts the first inclined plate and pushes it to start moving. When the first inclined plate moves, it drives the protective plate to start moving synchronously along the fixed direction of the guide block. The protective plate starts to move under the drive of the first inclined plate and comes into contact with the sealing plate.

[0011] The inclined panel 2 and the inclined panel 1 are both inclined on the side that are close to each other. The inclined panel 1 does not contact the protective plate. The drive ring is electrically connected to the electric telescopic rod. By setting the inclined surface, it is ensured that the inclined panel 2 can smoothly push the inclined panel 1 when rotating. By not contacting, it is ensured that there will be no excessive friction between the inclined panel 1 and the protective plate. By being electrically connected, it is ensured that the drive ring can start synchronously when the electric telescopic rod is started.

[0012] The sealing technology for the casing mudline suspension system - conical metal seal - also includes a locking device installed on the outer casing; The locking device includes a limiting mechanism for locking the protective device when the overall device is in operation and a releasing mechanism for releasing the lock on the protective device after the operation is completed. The design of the limiting and releasing mechanisms ensures that the limiting mechanism effectively restricts the protective device during operation, and the releasing mechanism quickly removes the restriction after the operation is completed.

[0013] The limiting mechanism includes two partition plates fixedly mounted on the closed plate, a fixed rod fixedly mounted between the two partition plates, a sliding plate slidably mounted on the circumferential surface of the fixed rod, a connecting plate fixedly mounted on the sliding plate, a limiting block fixedly mounted on the connecting plate, and a limiting plate fixedly mounted on the protective plate. As the protective plate moves along the fixed direction of the guide block, it simultaneously moves the limiting plate. During its movement, the limiting plate contacts the limiting block and pushes it to move. The movement of the limiting block causes the connecting plate to move synchronously, and the movement of the connecting plate causes the sliding plate to move synchronously. During its movement, the sliding plate compresses the spring between itself and the partition plate. As the limiting block is pushed, the limiting plate, under the continuous movement of the protective plate, passes through the limiting block. At this point, the limiting plate no longer contacts or pushes the limiting block. Subsequently, the sliding plate begins to move and reset under the action of the spring. During its reset, the sliding plate causes the connecting plate to move synchronously, and the movement of the connecting plate causes the limiting block to move. The movement of the limiting block causes the plane with the opposite inclined surface on it to contact the limiting plate.

[0014] The release mechanism includes a fixed frame fixedly installed on the closed plate, a second elastic telescopic rod fixedly installed on the fixed frame, an inclined rod fixedly installed on the movable end of the second elastic telescopic rod, a second inclined block fixedly installed on the connecting plate, and a pull plate fixedly installed on the circumferential surface of the movable end of the second elastic telescopic rod. The pull plate moves and drives the movable end of the second elastic telescopic rod to start moving. The movement of the movable end of the second elastic telescopic rod drives the inclined rod to start moving synchronously. The inclined rod moves and contacts and pushes the second inclined block to start moving. When the second inclined block moves, it drives the connecting plate to start moving in the same direction. When the connecting plate moves, it drives the limiting block to move synchronously. The limiting block moves and disengages from the limiting plate to release the restriction of the limiting plate. After the limiting plate is released, the restriction of the protective plate is also released.

[0015] The side of the limiting block closest to the limiting plate is set as an inclined surface, and the sides of the inclined rod that are in contact with the inclined block are also set as inclined surfaces. A spring is provided between the sliding plate and the partition plate. The inclined surfaces ensure that the limiting block can be smoothly pushed by the limiting plate, the inclined rod can smoothly push the inclined block when it moves, and the spring ensures that the sliding plate can achieve self-reset.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this invention, as the inclined ring moves along the inclined surface of the inclined block, it drives the fastening plate to move synchronously and gradually approach the outer sleeve until it is completely clamped. This helps the contact surface of the conical metal sealing device maintain good contact pressure, ensuring that the metal contact surfaces always maintain appropriate pressure. This effectively avoids contact surface failure caused by external forces or environmental changes, thereby enhancing the sealing effect. At the same time, it increases the stability between the outer sleeve and the sealing device, enhances the system's adaptability to high pressure and vibration, and helps keep the sealing device from displacing under pressure, thereby effectively preventing leakage problems caused by the offset, damage, or uneven pressure of the sealing surface.

[0017] 2. In this invention, the protective plate moves under the action of the inclined plate and comes into contact with the sealing plate to protect the working area of ​​the fastening device. This protects the fastening device and the sealing area from external physical damage or corrosion. It can effectively prevent external factors such as sand, mud, corrosive chemicals, and mechanical impact from directly affecting the fastening device, thereby reducing the occurrence of device failure. At the same time, it can prevent drilling fluid, mud and other fluids from directly contacting the sealing device, thereby reducing sealing failure caused by fluid leakage or pollution.

[0018] 3. In this invention, the limiting plate is restricted and locked together with the protective plate, ensuring that the fixed position of the protective plate remains stable and will not shift or fall off due to vibration, impact, or misoperation. This ensures that the dangerous area is always protected, while also preventing the protective plate from shifting position. This continuously blocks mud, rock cuttings, corrosive media, and other hard impurities from entering the fastening device, avoiding fastener jamming, thread wear, contact surface corrosion, and connection loosening and failure caused by impurities. This ensures that the fastening device always maintains a stable and reliable clamping state on the outer sleeve, thereby ensuring that the conical metal sealing pair is in a precise, evenly fitted working state for a long time. When the limiting plate is released, the restriction on the protective plate is also released, and the protective plate can then be moved. This ensures that the restriction lock can be quickly released after the work is completed, and the limit constraint can be quickly released without complicated tools, avoiding the extended operation time caused by the limit structure jamming and cumbersome disassembly and assembly. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the positional structure of inner sleeve one and inner sleeve two of the present invention; Figure 3 This is a cross-sectional view of the fastening device of the present invention. Figure 4 This is a cross-sectional view of the structure of the mating ring and the inclined block at one position according to the present invention; Figure 5This is a cross-sectional view of the protective device's location and structure according to the present invention; Figure 6 This is a cross-sectional view of the positional structure of the driving ring and the passive ring of the present invention; Figure 7 This is a cross-sectional view of the locking device position structure of the present invention; Figure 8 This is a cross-sectional view of the two-position structure of the fixed frame and the elastic telescopic rod of the present invention.

[0020] The meanings of the labels in the diagram are as follows: 1. Outer sleeve; 2. Inner sleeve one; 3. Inner sleeve two; 4. Fixing ring; 5. Electric telescopic rod; 6. Top ring; 7. Vertical plate; 8. Elastic telescopic rod one; 9. Fastening plate; 10. Connecting block; 11. Inclined ring; 12. Matching ring; 13. Inclined block one; 141. Guide block; 142. Protective plate; 143. Inclined panel one; 144. Sealing plate; 145. Drive ring; 146. Passive ring; 147. Fixing block; 148. Inclined panel two; 151. Divider plate; 152. Fixing rod; 153. Sliding plate; 154. Connecting plate; 155. Limiting block; 156. Limiting plate; 157. Fixing frame; 158. Elastic telescopic rod two; 159. Inclined rod; 1510. Inclined block two; 1511. Pull plate. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1-4 One embodiment of the present invention is: a sealing technology form for a casing mudline suspension system - a conical metal seal, which includes an outer sleeve 1, an inner sleeve 1 2 installed inside the outer sleeve 1, and an inner sleeve 2 3 installed inside the inner sleeve 1 2. The sealing technology form for the casing mudline suspension system - a conical metal seal further includes: a fastening device installed on the outer sleeve 1. The fastening device includes a fastening mechanism for fastening the outer sleeve 1 when the whole device is in operation, and a pushing mechanism for moving the fastening mechanism to start working when the device starts working. The fastening mechanism includes a fastening plate 9, a connecting block 10 fixedly mounted on the fastening plate 9, a beveled ring 11 fixedly mounted on the connecting block 10, a mating ring 12 fixedly mounted on the outer sleeve 1, and a beveled block 13 fixedly mounted on the mating ring 12. When the beveled ring 11 moves along the beveled surface of the beveled block 13, it drives the fastening plate 9 to move synchronously and gradually approach the outer sleeve 1 until it is completely clamped. This helps the contact surface of the conical metal sealing device maintain good contact pressure, ensuring that the metal contact surfaces always maintain appropriate pressure. This effectively avoids contact surface failure caused by external forces or environmental changes, thereby enhancing the sealing effect. At the same time, it increases the stability between the outer sleeve 1 and the sealing device, enhances the system's adaptability to high pressure and vibration, and helps keep the sealing device from displacing under pressure, thereby effectively preventing leakage problems caused by the offset, damage, or uneven pressure of the sealing surface.

[0023] The pushing mechanism includes a fixed ring 4, an electric telescopic rod 5 set on the fixed ring 4, a top ring 6 fixedly installed at the output end of the electric telescopic rod 5, a vertical plate 7 fixedly installed on the top ring 6, and an elastic telescopic rod 8 fixedly installed on the vertical plate 7. The setting of the pushing mechanism ensures that the fastening mechanism can move smoothly to perform fastening work during operation.

[0024] The movable end of the elastic telescopic rod 8 is fixedly connected to the fastening plate 9. The inclined ring 11 and the inclined block 13 are both set as inclined surfaces on their sides. The fixed connection ensures that the movable end of the elastic telescopic rod 8 can drive the fastening plate 9 to move synchronously when it moves. The inclined surface ensures that the inclined ring 11 can move smoothly along the inclined surface when it moves.

[0025] In this embodiment, before starting the use of the casing mudline suspension system for conical metal sealing and commencing operation, a professional staff member needs to inspect the entire device. After the staff member has completed the inspection and confirmed that everything is correct, the staff member installs the entire device in place. By relying on the weight of the casing or the axial preload, the two conical surfaces are tightly fitted together. During operation, the higher the internal pressure, the tighter the conical surfaces are squeezed, and the better the sealing effect. There are no rubber parts throughout the process; it is a pure metal contact seal. It relies on its own structure to achieve a pressure self-reinforcing effect. It has the characteristics of high temperature resistance, high pressure resistance, corrosion resistance, and no elastomer aging failure, and can adapt to the complex and harsh service environment of the seabed mudline area. After the device is installed in place, the electric telescopic rod 5 is activated, causing the top ring 6 to move. As the top ring 6 moves, the vertical plate 7 moves, which in turn causes the elastic telescopic rod 8 to move synchronously. The elastic telescopic rod 8 then causes the fastening plate 9 to move in the same direction. The fastening plate 9 then causes the connecting block 10 to move synchronously. The connecting block 10 then causes the inclined ring 11 to move. The inclined ring 11 contacts the inclined block 13 and begins to move along its inclined surface. As the inclined ring 11 moves along the inclined surface of the inclined block 13, it causes the fastening plate 9 to open. The synchronous movement of the outer sleeve 1 gradually brings it closer to the outer sleeve 1 until it is completely clamped. This helps maintain good contact pressure on the contact surface of the conical metal sealing device, ensuring that the metal contact surfaces always maintain appropriate pressure. This effectively avoids contact surface failure caused by external forces or environmental changes, thereby enhancing the sealing effect. At the same time, it increases the stability between the outer sleeve 1 and the sealing device, enhances the system's adaptability to high pressure and vibration, and helps keep the sealing device from shifting under pressure, thus effectively preventing leakage problems caused by sealing surface misalignment, damage, or uneven pressure.

[0026] Please see Figures 5-8 Based on the above embodiments, in another embodiment of the present invention, the sealing technology form for the casing mudline suspension system - the conical metal seal - further includes a protective device installed on the outer casing 1. The protective device is used to effectively protect the fastening device when the whole device is in operation, and to provide a simple seal for the area of ​​the fastening device; The installation of protective devices ensures that the fastening devices can be effectively protected during operation, thus ensuring the stability of the device during operation.

[0027] The protective device includes a guide block 141 fixedly installed on the circumferential surface of the fixed ring 4, a protective plate 142 slidably installed on the guide block 141, an inclined plate 143 fixedly installed on the protective plate 142, a sealing plate 144 fixedly installed on the outer sleeve 1, a drive ring 145 set on the outer sleeve 1, a passive ring 146 fixedly installed on the output end of the drive ring 145, a fixed block 147 fixedly installed on the passive ring 146, and an inclined plate 148 fixedly installed on the fixed block 147. The protective plate 142 moves under the drive of the inclined plate 143 and comes into contact with the sealing plate 144 to protect the working area of ​​the fastening device. This protects the fastening device and the sealing area from external physical damage or corrosion. It can effectively avoid the direct impact of external factors such as sand, mud, corrosive chemicals, and mechanical impact on the fastening device, thereby reducing the occurrence of device failure. At the same time, it can prevent drilling fluid, mud and other fluids from directly contacting the sealing device, thereby reducing the sealing failure caused by fluid leakage or pollution.

[0028] The sides of inclined panel 148 and inclined panel 143 that are close to each other are both set as inclined surfaces. Inclined panel 143 does not contact the protective plate 142. The drive ring 145 is electrically connected to the electric telescopic rod 5. By setting the inclined surfaces, it is ensured that inclined panel 148 can smoothly push inclined panel 143 when rotating. By not contacting, it is ensured that there will be no excessive friction between inclined panel 143 and the protective plate 142. By being electrically connected, it is ensured that the drive ring 145 can start synchronously when the electric telescopic rod 5 is started.

[0029] The sealing technology for casing mudline suspension systems - conical metal seals - also includes a locking device mounted on the outer casing 1; The locking device includes a limiting mechanism for locking the protective device when the overall device is in operation and a releasing mechanism for releasing the lock on the protective device after operation is completed; The design of the limiting and releasing mechanisms ensures that the limiting mechanism effectively restricts the protective device during operation, and the releasing mechanism quickly removes the restriction after the operation is completed.

[0030] The limiting mechanism includes two partition plates 151 fixedly installed on the sealing plate 144, a fixed rod 152 fixedly installed between the two partition plates 151, a sliding plate 153 slidably installed on the circumferential surface of the fixed rod 152, a connecting plate 154 fixedly installed on the sliding plate 153, a limiting block 155 fixedly installed on the connecting plate 154, and a limiting plate 156 fixedly installed on the protective plate 142. The limiting plate 156 restricts and locks the protective plate 142 together, ensuring that the fixed position of the protective plate 142 is always stable and will not shift or fall off due to vibration, impact or misoperation, thereby ensuring that the dangerous area is always protected. At the same time, it can ensure that the protective plate 142 does not shift in position, continuously blocking mud, rock cuttings, corrosive media and other hard impurities from entering the fastening device, avoiding impurities causing fastener jamming, thread wear, contact surface corrosion and connection loosening failure, so that the fastening device always maintains a stable and reliable clamping state on the outer sleeve 1, thereby ensuring that the conical metal sealing pair is in a precise centering and uniform fit working state for a long time.

[0031] The release mechanism includes a fixed frame 157 fixedly installed on the closed plate 144, a second elastic telescopic rod 158 fixedly installed on the fixed frame 157, a ramp rod 159 fixedly installed on the movable end of the second elastic telescopic rod 158, a second ramp block 1510 fixedly installed on the connecting plate 154, and a pull plate 1511 fixedly installed on the circumferential surface of the movable end of the second elastic telescopic rod 158. After the restriction plate 156 is released, the restriction of the protective plate 142 is also released. Subsequently, the protective plate 142 can be moved to ensure that the restriction lock can be quickly released after the work is completed. At the same time, the limit constraint can be quickly released without complicated tools, avoiding the prolongation of operation time due to the jamming of the limit structure and the cumbersome disassembly and assembly.

[0032] The side of the limiting block 155 closest to the limiting plate 156 is set as an inclined surface. The sides of the inclined rod 159 and the inclined block 1510 that are in contact with each other are also set as inclined surfaces. A spring is provided between the sliding plate 153 and the partition plate 151. The inclined surfaces ensure that the limiting block 155 can be smoothly pushed by the limiting plate 156. The inclined surfaces ensure that the inclined rod 159 can smoothly push the inclined block 1510 when moving. The spring ensures that the sliding plate 153 can achieve self-reset.

[0033] In this embodiment, during operation: Simultaneously with the activation of the electric telescopic rod 5, which pushes the top ring 6 to move, the drive ring 145 starts synchronously with the electric telescopic rod 5. The drive ring 145 then drives the passive ring 146 to rotate. The rotation of the passive ring 146 causes the fixed block 147 to rotate synchronously. Simultaneously, the fixed block 147 rotates, causing the second inclined plate 148 to rotate synchronously. The second inclined plate 148, during its rotation, contacts the first inclined plate 143 and pushes it to move. The first inclined plate 143, during its movement, causes the protective plate 142 to move synchronously along the fixed direction of the guide block 141. Driven by the first inclined plate 143, the protective plate 142 moves and contacts the sealing plate 144, protecting the working area of ​​the fastening device. This protects the fastening device and sealing area from external physical damage or corrosion, effectively preventing the direct impact of external factors such as sand, mud, corrosive chemicals, and mechanical impact on the fastening device, thereby reducing device failure. It also prevents drilling fluid, mud, and other fluids from directly contacting the sealing device, thus reducing sealing failure caused by fluid leakage or contamination.

[0034] As the protective plate 142 begins to move along the fixed direction of the guide block 141, it simultaneously moves the limiting plate 156. During its movement, the limiting plate 156 contacts the limiting block 155 and pushes it to begin moving. The movement of the limiting block 155 causes the connecting plate 154 to move synchronously, which in turn causes the sliding plate 153 to move synchronously. As the sliding plate 153 moves, it compresses the spring between itself and the partition plate 151. Simultaneously with the limiting block 155 being pushed, the limiting plate 156, under the continuous movement of the protective plate 142, passes through the limiting block 155. At this point, the limiting plate 156 no longer contacts or pushes the limiting block 155. Subsequently, the sliding plate 153, under the influence of the spring... Under the action of the sliding plate 153, the sliding plate 153 moves synchronously with the connecting plate 154. The movement of the connecting plate 154 causes the limiting block 155 to move. The limiting block 155 moves so that the plane with the opposite inclined surface on it contacts the limiting plate 156, thus limiting the limiting plate 156. The limiting plate 156 is limited and locked together with the protective plate 142, ensuring that the fixed position of the protective plate 142 remains stable and will not shift or fall off due to vibration, impact, or misoperation. This ensures that the dangerous area is always protected and that the protective plate 142 does not shift in position, continuously blocking mud, rock cuttings, and corrosion from the well. Corrosive media and other hard impurities cannot enter the fastening device, preventing them from causing fastener jamming, thread wear, contact surface corrosion, and connection loosening failure. This ensures the fastening device maintains a stable and reliable clamping state on the outer sleeve 1, guaranteeing that the conical metal sealing pair remains in a precise, evenly aligned working state for an extended period. When the protective plate 142 needs to be released after the entire device has finished operating, a worker must manually press down the pull plate 1511, ensuring safety. This causes the pull plate 1511 to move, which in turn moves the movable end of the elastic telescopic rod 158. The movement of the movable end of the elastic telescopic rod 158 then moves the inclined rod 159 synchronously. 159 moves and contacts the inclined block 1510, which then moves the connecting plate 154 in the same direction. The connecting plate 154 moves synchronously with the limiting block 155. The limiting block 155 moves and disengages from the limiting plate 156, thus releasing the restriction of the limiting plate 156. After the limiting plate 156 is released, the restriction of the protective plate 142 is also released, allowing the protective plate 142 to move. This ensures that the restriction lock can be quickly released after the work is completed, and the limit constraint can be quickly released without complicated tools, avoiding the extended operation time caused by the limit structure getting stuck and the cumbersome disassembly and assembly.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sealing technology for a casing mudline suspension system - a conical metal seal, comprising an outer casing (1), an inner casing one (2) installed inside the outer casing (1), and an inner casing two (3) installed inside the inner casing one (2), characterized in that, The sealing technology form for the casing mudline suspension system - conical metal seal - further includes: a fastening device installed on the outer casing (1); The fastening device includes a fastening mechanism for fastening the outer sleeve (1) when the whole device is in operation, and a pushing mechanism for pushing the fastening mechanism to start moving when the device starts working; The fastening mechanism includes a fastening plate (9), a connecting block (10) fixedly installed on the fastening plate (9), a bevel ring (11) fixedly installed on the connecting block (10), a mating ring (12) fixedly installed on the outer sleeve (1), and a bevel block (13) fixedly installed on the mating ring (12).

2. The sealing technology for casing mudline suspension systems according to claim 1—conical metal seal—is characterized in that: The pushing mechanism includes a fixed ring (4), an electric telescopic rod (5) disposed on the fixed ring (4), a top ring (6) fixedly installed at the output end of the electric telescopic rod (5), a vertical plate (7) fixedly installed on the top ring (6), and an elastic telescopic rod (8) fixedly installed on the vertical plate (7).

3. The sealing technology for the casing mudline suspension system according to claim 2—a conical metal seal—is characterized in that: The movable end of the elastic telescopic rod (8) is fixedly connected to the fastening plate (9), and the inclined ring (11) and the inclined block (13) are both set as inclined surfaces on their sides that are close to each other.

4. The sealing technology for casing mudline suspension systems according to claim 1—conical metal seal—is characterized in that: The sealing technology form for the casing mudline suspension system - conical metal seal - also includes a protective device installed on the outer casing (1); The protective device is used to effectively protect the fastening device when the overall device is in operation, and to provide a simple seal for the area of ​​the fastening device.

5. The sealing technology for casing mudline suspension systems according to claim 4—a conical metal seal—is characterized in that: The protective device includes a guide block (141) fixedly installed on the circumferential surface of the fixed ring (4), a protective plate (142) slidably installed on the guide block (141), an inclined plate (143) fixedly installed on the protective plate (142), a sealing plate (144) fixedly installed on the outer tube (1), a drive ring (145) provided on the outer tube (1), a passive ring (146) fixedly installed on the output end of the drive ring (145), a fixed block (147) fixedly installed on the passive ring (146), and an inclined plate (148) fixedly installed on the fixed block (147).

6. The sealing technology for a casing mudline suspension system according to claim 5—a conical metal seal—is characterized in that: The inclined panel 2 (148) and the inclined panel 1 (143) are both inclined on the side that are close to each other. The inclined panel 1 (143) does not contact the protective plate (142). The drive ring (145) is electrically connected to the electric telescopic rod (5).

7. The sealing technology for casing mudline suspension systems according to claim 1—conical metal seal—is characterized in that: The sealing technology form for the casing mudline suspension system - conical metal seal - also includes a locking device installed on the outer casing (1); The locking device includes a limiting mechanism for locking the protective device when the overall device is in operation, and a releasing mechanism for releasing the lock on the protective device after the operation is completed.

8. The sealing technology for a casing mudline suspension system according to claim 7—a conical metal seal—is characterized in that: The limiting mechanism includes two partition plates (151) fixedly installed on the closed plate (144), a fixed rod (152) fixedly installed between the two partition plates (151), a sliding plate (153) slidably installed on the circumferential surface of the fixed rod (152), a connecting plate (154) fixedly installed on the sliding plate (153), a limiting block (155) fixedly installed on the connecting plate (154), and a limiting plate (156) fixedly installed on the protective plate (142).

9. The sealing technology for a casing mudline suspension system according to claim 8—a conical metal seal—is characterized in that: The release mechanism includes a fixed frame (157) fixedly installed on the closed plate (144), a second elastic telescopic rod (158) fixedly installed on the fixed frame (157), a slope rod (159) fixedly installed on the movable end of the second elastic telescopic rod (158), a second slope block (1510) fixedly installed on the connecting plate (154), and a pull plate (1511) fixedly installed on the circumferential surface of the movable end of the second elastic telescopic rod (158).

10. The sealing technology for a casing mudline suspension system according to claim 9—a conical metal seal—is characterized in that: The side of the limiting block (155) near the limiting plate (156) is set as an inclined surface, the side of the inclined rod (159) that is in contact with the inclined block (1510) is also set as an inclined surface, and a spring is provided between the sliding plate (153) and the partition plate (151).

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