A mudline casing hanger tieback tool

Abstract

The utility model discloses a kind of mud line casing hanger back connection tools, it is related to well drilling operation technical field, to solve the problem of the operation efficiency of the existing casing hanger back connection tool is not high, the mud line casing hanger back connection tool is used for detachably connecting casing and casing hanger, it includes: cylindrical main body, the first end of cylindrical main body is equipped with the first thread section with casing screw connection, the second end of cylindrical main body is equipped with the second thread section with casing hanger screw connection, the thread rotation direction of first thread section and second thread section is same, the quick connection between casing, casing hanger is realized by the mode of screw connection, simple operation can effectively save installation time, improve field work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of drilling operation technology, and more specifically, to a mudline casing hanger reconnection tool. Background Technology

[0002] In offshore oil and gas exploration and development, drilling platforms are key facilities for carrying out drilling operations. A reliable fluid transport channel needs to be established from the drilling platform to the bottom of the well for circulating drilling fluid. Therefore, the casing mudline suspension system has emerged, which constructs this crucial channel by interfacing with the riser casing system.

[0003] Once an oil and gas field enters the production phase, the casing hangers at each level need to be reconnected to the production platform, thus establishing an oil and gas production channel between the production platform and the casing hanger system. This channel is essential for the smooth transport of oil and gas from the well bottom to the production platform, and subsequently for processing and transportation. The casing hangers play a crucial connecting and supporting role, ensuring stable transport of oil and gas under complex conditions such as varying pressures and temperatures, while also preventing leaks and guaranteeing the safety and efficiency of the production process.

[0004] However, existing casing hanger reconnection tools have complex structures and contain numerous parts, making the assembly, disassembly, and maintenance of the tools extremely cumbersome, requiring a lot of time and manpower, and affecting on-site operation efficiency.

[0005] Therefore, how to solve the problem of low operating efficiency of existing casing hanger reconnection tools is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a mudline sleeve hanger reconnection tool, which realizes quick connection with the sleeve and sleeve hanger through threaded connection. It is simple to operate, can effectively save installation time, and improve on-site work efficiency.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A mudline casing hanger reconnection tool for detachably connecting casing and casing hanger, comprising: a cylindrical body, a first end of the cylindrical body having a first threaded section for threaded connection with the casing, and a second end of the cylindrical body having a second threaded section for threaded connection with the casing hanger, wherein the threads on the first threaded section and the second threaded section have the same direction of rotation.

[0009] Preferably, the second end of the cylindrical body is further provided with a sealing section that is interference-fitted with the sleeve hanger. The outer diameter of the sealing section is larger than the outer diameter of the second threaded section. The sealing section is used to connect the first threaded section and the second threaded section.

[0010] Preferably, the sealing section has a groove that is recessed radially inward along the cylindrical body, and a sealing element is provided in the groove.

[0011] Preferably, at least two grooves are provided, and at least two grooves are arranged along the axial direction of the cylindrical body.

[0012] Preferably, the outer periphery of the sealing section near the first threaded section is provided with a protrusion, and the protrusion is provided with a snap-fit ​​groove extending axially along the cylindrical body. The opening of the snap-fit ​​groove faces the second threaded section, and the snap-fit ​​groove is used to restrict one end of the sleeve hanger.

[0013] Preferably, the snap-fit ​​groove is a trapezoidal groove.

[0014] Preferably, the second end of the cylindrical body is further provided with an extension section, which is connected to the second threaded section, and the outer diameter of the extension section is smaller than the outer diameter of the second threaded section.

[0015] Preferably, the thread on the first threaded segment is an internal thread, and the thread on the second threaded segment is an external thread.

[0016] Preferably, the end of the first threaded section near the sealing section is connected to the inner wall of the cylindrical body through a tapered surface.

[0017] Preferably, the thread profile of both the first thread segment and the second thread segment is a trapezoidal thread.

[0018] The mudline sleeve hanger reconnection tool provided by this utility model is used for detachably connecting the sleeve and the sleeve hanger. Specifically, the reconnection tool includes a cylindrical body. The first end of the cylindrical body is provided with a first threaded section that is threaded to the sleeve, and the second end of the cylindrical body is provided with a second threaded section that is threaded to the sleeve hanger. By setting a single part, the connection between the sleeve and the sleeve hanger can be realized, reducing the number of parts in the reconnection tool and simplifying its structure. The threads on the first and second threaded sections have the same direction of rotation, ensuring the connection strength when the cylindrical body is threaded to the sleeve and the sleeve hanger. Moreover, the torque required for the threaded connection is small, which facilitates installation and disassembly. The cylindrical body achieves a quick connection with the sleeve and the sleeve hanger through the threaded connection. The operation is simple, which can effectively save installation time and improve on-site work efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1This is a schematic diagram of the reconnection tool for the mudline sleeve hanger provided by this utility model.

[0021] Figure 2 A schematic diagram illustrating the use of the mudline sleeve hanger reconnection tool provided by this utility model;

[0022] Figure 3 for Figure 2 A magnified view of a portion of the image.

[0023] Figure label:

[0024] 10-Casing hanger;

[0025] 1-Cylindrical body, 11-First threaded section, 12-Second threaded section, 13-Sealing section, 131-Groove, 132-Snap-fit ​​groove, 14-Extension section. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] It should be noted that the directional terms such as "inner" and "outer" in the following text are defined based on the accompanying drawings in the instruction manual.

[0029] The core of this utility model is to provide a mudline sleeve hanger reconnection tool, which realizes quick connection between the sleeve and the sleeve hanger 10 through threaded connection. It is simple to operate, can effectively save installation time, and improve on-site work efficiency.

[0030] Please refer to Figure 1 , Figure 2 and Figure 3 A mudline sleeve hanger reconnection tool is used for detachable connection of sleeve and sleeve hanger 10.

[0031] Specifically, the casing hanger reconnection tool includes a cylindrical body 1. The first end of the cylindrical body 1 is provided with a first threaded section 11 that is threaded to the casing, and the second end of the cylindrical body 1 is provided with a second threaded section 12 that is threaded to the casing hanger 10. By setting up a single part, the connection between the casing and the casing hanger 10 can be realized, reducing the number of parts in the reconnection tool and simplifying its structure. The threads on the first threaded section 11 and the second threaded section 12 have the same direction of rotation, ensuring the connection strength when the cylindrical body 1 is threaded to the casing and the casing hanger 10. Moreover, the torque required for the threaded connection is small, which facilitates installation and disassembly. The cylindrical body 1 achieves a quick connection with the casing and the casing hanger 10 through the threaded connection. The operation is simple, which can effectively save installation time and improve on-site work efficiency.

[0032] The mudline sleeve hanger reconnection tool designed in the above manner facilitates quick connection and disassembly with the sleeve and sleeve hanger 10. It is easy to operate, can effectively save installation time, and improve on-site work efficiency.

[0033] In the above embodiment, the second end of the cylindrical body 1 is also provided with a sealing section 13 that is interference-fitted with the sleeve hanger 10. The outer diameter of the sealing section 13 is larger than the outer diameter of the second threaded section 12. The sealing section 13 is used to connect the first threaded section 11 and the second threaded section 12.

[0034] It should be noted that both the cylindrical body 1 and the sleeve hanger 10 are made of metal. The cylindrical body 1 and the sleeve hanger 10 are formed by an interference fit to create a metal seal, which ensures the sealing between the two.

[0035] In use, torque is applied to the cylindrical body 1 through the sleeve to achieve an interference fit between the cylindrical body 1 and the sleeve hanger 10, that is, a metal seal is formed between the sealing section 13 of the cylindrical body 1 and the sleeve hanger 10, which is simple to operate. The sealing section 13 is located in the middle of the cylindrical body 1, and the second threaded section 12 is located at the end of the cylindrical body 1 near the sleeve hanger 10. When the cylindrical body 1 and the sleeve hanger 10 are installed, the second threaded section 12 of the cylindrical body 1 is threadedly connected to the sleeve hanger 10. Then the sealing section 13 of the cylindrical body 1 and the sleeve hanger 10 begin to contact. Finally, torque is applied to the cylindrical body 1 through the sleeve to achieve an interference fit between the cylindrical body 1 and the sleeve hanger 10, forming a metal seal.

[0036] In the above case, the sealing section 13 is provided with a groove 131 that is recessed radially inward along the cylindrical body 1, and a sealing element is provided in the groove 131.

[0037] It is understandable that by providing a groove 131 in the sealing section 13, the stiffness of the cylindrical body 1 in the area near the groove 131 can be reduced, allowing it to undergo rigid deformation to adapt to the shape of the casing hanger 10. This ensures that the cylindrical body 1 and the casing hanger 10 can be interference-fitted, while a sealing cavity is formed between the cylindrical body 1 and the casing hanger 10 after the interference fit. This ensures the sealing performance between the cylindrical body 1 and the casing hanger 10, so that the fluid is effectively isolated in the sealing cavity and cannot leak through the fitting gap, thus providing a double guarantee for the sealing performance of the entire system.

[0038] By providing a groove 131 that is radially recessed inward along the cylindrical body 1 in the sealing section 13, and installing a sealing element within the groove 131, multiple sealing barriers are formed. Compared to a single sealing structure, this significantly improves the reliability of the seal and effectively prevents fluid leakage. The design of the groove 131 reduces the stiffness of the reconnection tool body in the region near the groove 131, allowing for rigid deformation to adapt to the shape within the hole of the casing hanger 10. This adaptability ensures a tight fit between the sealing element and the inner wall of the casing hanger 10, guaranteeing a good sealing effect even in the presence of manufacturing errors or assembly deviations.

[0039] Furthermore, at least two grooves 131 are provided, and at least two grooves 131 are arranged along the axial direction of the cylindrical body 1.

[0040] It should be noted that at least two grooves 131 are provided and arranged along the axial direction of the cylindrical body 1, which makes the stiffness distribution of the sealing section 13 more reasonable. While ensuring sealing performance, it avoids the overall structural strength reduction caused by excessively low local stiffness. The multi-groove design 131 makes the installation and replacement of the seal more convenient. Since the seal is distributed in multiple grooves 131, even if a seal is damaged, it can be replaced individually, thereby simplifying the maintenance process.

[0041] In practical applications, there is no limit to the number of grooves 131, as long as the above-mentioned technical effects can be achieved.

[0042] In the above embodiment, the outer periphery of the sealing section 13 near the first threaded section 11 is provided with a protrusion, and the protrusion is provided with a snap-fit ​​groove 132 extending axially along the cylindrical body 1. The opening of the snap-fit ​​groove 132 faces the second threaded section 12, and the snap-fit ​​groove 132 is used to restrict one end of the sleeve hanger 10.

[0043] Understandably, by setting the snap-fit ​​groove 132 to limit the position of one end of the casing hanger 10, the area of ​​the metal seal between the cylindrical body 1 and the casing hanger 10 can be increased, thereby improving the metal sealing effect. The structural design of the snap-fit ​​groove 132 ensures that the casing hanger 10 can be accurately positioned during assembly, avoiding sealing failure or other connection problems caused by positional deviation. The cooperation between the snap-fit ​​groove 132 and the casing hanger 10 makes the connection between the two more stable. During operation, even if affected by external forces or vibrations, the casing hanger 10 is not prone to displacement or loosening, thus ensuring the stability and reliability of the entire system. The design of the snap-fit ​​groove 132 is not only used for limiting the position, but also increases the metal sealing area between the reconnection tool and the casing hanger 10. By expanding the sealing contact surface, the metal sealing effect can be effectively improved, reducing the risk of fluid leakage.

[0044] Based on the above embodiment, the snap-fit ​​groove 132 is a trapezoidal groove.

[0045] It should be noted that the snap-fit ​​groove 132 creates an irregular structure on the metal sealing surface, further improving the metal sealing effect and dispersing the pressure on the sealing surface, thereby improving the reliability and durability of the seal. The trapezoidal shape of the groove gives it good self-locking performance when snapping into the sleeve hanger 10. When the sleeve hanger 10 is inserted into the snap-fit ​​groove 132, the contact area between it and the groove wall gradually increases, and the friction also increases, thus effectively preventing the sleeve hanger 10 from loosening or falling off during operation.

[0046] In the above embodiment, the second end of the cylindrical body 1 is further provided with an extension section 14, which is connected to the second threaded section 12, and the outer diameter of the extension section 14 is smaller than the outer diameter of the second threaded section 12.

[0047] It is understandable that by adding the extension section 14, the length of the cylindrical body 1 is extended, the contact area between the cylindrical body 1 and the sleeve hanger 10 is increased, and the outer diameter of the extension section 14 is smaller than the outer diameter of the second threaded section 12, which facilitates the alignment work between the cylindrical body 1 and the sleeve hanger 10 before installation, eliminating the need for complex centering adjustments and greatly improving installation efficiency.

[0048] The extension section 14 extends the length of the reconnection tool, thereby increasing the contact surface between the reconnection tool and the sleeve hanger 10. This allows for better stress dispersion and reduces local stress concentration, thus improving the stability and reliability of the connection.

[0049] In a preferred embodiment, the thread on the first threaded section 11 is an internal thread, and the thread on the second threaded section 12 is an external thread.

[0050] It should be noted that the combination of the first threaded section 11 (internal thread) and the second threaded section 12 (external thread) provides a dual-threaded connection mechanism, making the connection between the reconnection tool and the casing and casing hanger 10 more secure and effectively preventing loosening or detachment. Because the threads have the same direction of rotation, the connection of the internal and external threads can evenly distribute stress across the two threaded sections, reducing localized stress concentration and improving the durability and reliability of the connection. The combination of internal and external threads makes the installation process more intuitive and simple. Operators can first connect the first threaded section 11 to the casing, and then connect the second threaded section 12 to the casing hanger 10. This step-by-step installation method reduces the complexity and probability of errors during installation, improving installation efficiency.

[0051] The combination of internal and external threads utilizes standardized thread specifications, making the manufacturing process simpler and more efficient. Standardized thread design allows for the use of existing production equipment and processes, reducing manufacturing costs.

[0052] In the above case, the end of the first threaded section 11 near the sealing section 13 is connected to the inner wall of the cylindrical body 1 through a tapered surface.

[0053] Understandably, the tapered surface design makes the connection between the first threaded section 11 and the inner wall of the cylindrical body 1 smoother, effectively dispersing stress and reducing local stress concentration. During threaded connection, especially under load, this smooth transition can significantly reduce the risk of fatigue damage caused by stress concentration, thereby improving the reliability and durability of the connection.

[0054] Based on the above embodiments, the thread profiles of the first thread segment 11 and the second thread segment 12 are both trapezoidal threads. Trapezoidal threads have good self-locking properties and high strength, effectively preventing the threaded connection from loosening during operation, while also withstanding large axial and radial loads, making them suitable for connection applications requiring high reliability. However, in practical applications, there are no restrictions on the thread profiles of the first thread segment 11 and the second thread segment 12; they can be designed according to actual conditions.

[0055] When using this reconnection tool, first select a sleeve that is compatible with the cylindrical body 1. The sleeve and the cylindrical body 1 are connected by threaded engagement. This process is carried out on the drilling rig. When selecting the sleeve, the length and diameter need to be considered. In this embodiment, the connection between the sleeve and the cylindrical body 1 is achieved by applying a tightening torque to the sleeve or the cylindrical body 1. Next, the connected sleeve and cylindrical body 1 are sent to the top of the sleeve hanger 10, and the sleeve is rotated counterclockwise, which drives the cylindrical body 1 to rotate counterclockwise synchronously. When the sleeve suddenly descends by one thread pitch, the second thread section 12 of the cylindrical body 1 and the starting position of the sleeve hanger 10 are confirmed. After the starting position of the thread is determined, the sleeve is rotated clockwise, which drives the cylindrical body 1 to rotate clockwise synchronously. After the cylindrical body 1 rotates a certain number of times, the cylindrical body 1 and the sleeve hanger 10 begin to make interference fit contact, that is, the sealing section 13 of the cylindrical body 1 and the sleeve hanger 10 begin to contact. The metal seal between the cylindrical body 1 and the sleeve hanger 10 is achieved by applying torque, and the direction of the applied torque, the direction of the first thread section 11, and the direction of the second thread section 12 are the same. Torque is applied to the cylindrical body 1 through the sleeve to achieve an interference fit between the contact surfaces of the cylindrical body 1 and the sleeve hanger 10, forming a metal seal, until one end of the sleeve hanger 10 is engaged into the snap-fit ​​groove 132, thus completing the sealed connection between the cylindrical body 1 and the sleeve hanger 10.

[0056] In summary, the mudline sleeve hanger reconnection tool provided by this utility model, during operation, connects to the sleeve via a first threaded section 11 and a second threaded section 12. Furthermore, by ensuring that both the reconnection tool and the sleeve hanger 10 are made of metal, an interference fit between them forms a metal seal, guaranteeing a tight seal. This simplified structure and threaded connection enable rapid connection to the sleeve and sleeve hanger 10, simplifying operation, reducing installation time, and improving on-site work efficiency.

[0057] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0059] The above provides a detailed description of the mudline sleeve hanger reconnection tool provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. A mudline sleeve hanger reconnection tool for detachably connecting the sleeve and the sleeve hanger (10), characterized in that, include: The cylindrical body (1) has a first threaded section (11) at its first end that is threaded to the sleeve, and a second threaded section (12) at its second end that is threaded to the sleeve hanger (10). The first threaded section (11) and the second threaded section (12) have the same thread direction.

2. The mudline sleeve hanger reconnection tool according to claim 1, characterized in that, The second end of the cylindrical body (1) is also provided with a sealing section (13) that is interference-fitted with the sleeve hanger (10). The outer diameter of the sealing section (13) is larger than the outer diameter of the second threaded section (12). The sealing section (13) is used to connect the first threaded section (11) and the second threaded section (12).

3. The mudline sleeve hanger reconnection tool according to claim 2, characterized in that, The sealing section (13) is provided with a groove (131) that is recessed radially inward along the cylindrical body (1), and a sealing element is provided in the groove (131).

4. The mudline sleeve hanger reconnection tool according to claim 3, characterized in that, At least two grooves (131) are provided, and at least two grooves (131) are arranged axially along the cylindrical body (1).

5. The mudline sleeve hanger reconnection tool according to claim 2, characterized in that, The sealing section (13) has a protrusion on the outer periphery of one end near the first threaded section (11). The protrusion has a snap-fit ​​groove (132) extending axially along the cylindrical body (1). The opening of the snap-fit ​​groove (132) faces the second threaded section (12). The snap-fit ​​groove (132) is used to restrict one end of the sleeve hanger (10).

6. The mudline sleeve hanger reconnection tool according to claim 5, characterized in that, The snap-fit ​​groove (132) is a trapezoidal groove.

7. The mudline sleeve hanger reconnection tool according to claim 6, characterized in that, The second end of the cylindrical body (1) is also provided with an extension section (14), which is connected to the second threaded section (12). The outer diameter of the extension section (14) is smaller than the outer diameter of the second threaded section (12).

8. The mudline sleeve hanger reconnection tool according to claim 7, characterized in that, The thread on the first threaded section (11) is an internal thread, and the thread on the second threaded section (12) is an external thread.

9. The mudline sleeve hanger reconnection tool according to any one of claims 2-8, characterized in that, The first threaded section (11) is connected to the inner wall of the cylindrical body (1) via a tapered surface at one end near the sealing section (13).

10. The mudline sleeve hanger reconnection tool according to claim 9, characterized in that, The thread profiles of the first thread segment (11) and the second thread segment (12) are both trapezoidal threads.

Images