Modular quick spliceable drilling riser

Abstract

The application belongs to the technical field of drilling riser and discloses a modularized drilling riser capable of being quickly spliced, which comprises a water pipe body, an upper flexible joint is arranged on the upper end of the water pipe body, and a lower flexible joint is arranged on the lower end of the water pipe body, a multi-section water pipe body structure is arranged, and a buoyancy section is detachably arranged between the adjacent two sections of the water pipe body, the first connecting ring of the water pipe body is butted with the second connecting ring of the buoyancy section, the toothed rubber ring between the first connecting ring and the second connecting ring is engaged, at the moment, the two half rings of the clamp are combined, the annular groove formed in the inner side of the clamp is wrapped outside the first connecting ring and the second connecting ring, the slope rubber ring in the annular groove is abutted with the first connecting ring and the second connecting ring, and the corrosion-resistant sealing ring maintains the sealing property of the connection between the single section of the water pipe body and the buoyancy section.

Description

Technical Field

[0001] This application relates to the field of drilling riser technology, and more specifically, to a modular drilling riser that can be quickly assembled. Background Technology

[0002] The buoyancy joint of the riser is a key component of the deep-sea drilling system. Its main function is to reduce the weight of the riser system, reduce the load on the drilling platform, and provide stability and protection in complex marine environments.

[0003] Currently, the connection methods between the riser and the buoyancy joint are flange connection and clamp / slip connection. Some designs involve local sealing welding on the outside of the clamp or the edge of the flange to improve overall rigidity and prevent loosening of the connection. This auxiliary welding installation method makes the drilling riser form a whole, which has the problems of inconvenient installation and removal of the drilling riser, space occupation for storage, and poor sealing and leakage prevention effect.

[0004] To address the aforementioned issues, this application provides a modular, quickly assembled drilling riser. Utility Model Content

[0005] The modular, rapidly assembled drilling riser provided in this application adopts the following technical solution:

[0006] A modular, quick-assembly drilling riser includes a riser body with an upper flexible joint at the upper end and a lower flexible joint at the lower end. The riser body is composed of multiple tubular segments, with a detachable buoyancy joint between adjacent segments. Each tubular segment has a first connecting ring at its port, and both ends of the buoyancy joint are fixed with second connecting rings that align with the first connecting rings of the tubular segments. Serrated rubber rings are embedded in the facing surfaces of both the first and second connecting rings, with the serrated surfaces of the rubber rings interlocking. Clamps are installed around the first and second connecting rings via quick-release bolts, and an annular groove is formed on the inner side of the clamp. Two beveled rubber rings are bonded to the inner side of the annular groove, abutting against the first and second connecting rings respectively. A corrosion-resistant sealing ring is embedded at the inner edge of the clamp.

[0007] The above technical solution has the advantages of modular design, quick loading, unloading and storage, and multiple sealing to prevent leakage.

[0008] Furthermore, the buoyancy joint has an overall tubular structure, and the shell of the buoyancy joint has an annular cavity inside.

[0009] The above technical solution, through the use of a buoyancy joint with a cavity and its flexible material design, reduces the self-weight of the riser system, reduces the load on the drilling platform, and provides stability and protection in complex marine environments.

[0010] Furthermore, the first connecting ring and the second connecting ring are the same size, the serrated rubber ring of the first connecting ring has a concave serrated surface, and the serrated rubber ring of the second connecting ring has a convex serrated surface.

[0011] The above technical solution uses a first connecting ring and a second connecting ring with serrated rubber rings to achieve a meshing connection of the serrated surfaces, thereby improving the sealing effect.

[0012] Furthermore, the clamp is composed of two semi-rings, and each semi-ring has an integral mounting block at both ends.

[0013] The above technical solution allows for easy assembly and installation using the two semi-rings of the clamp, while the mounting block is used for quick-release bolt installation and removal.

[0014] Furthermore, the corrosion-resistant sealing ring is disposed at the installation gap between the clamp and the buoyancy joint, and two corrosion-resistant sealing rings are disposed at the inner edge of the clamp, with the two corrosion-resistant sealing rings respectively corresponding to the first connecting ring and the second connecting ring.

[0015] Through the above technical solution, the corrosion-resistant sealing ring serves as a secondary sealing structure at the buoyancy joint installation location, providing excellent leak prevention.

[0016] Furthermore, the sloping rubber ring is provided with an annular slope, and the annular slope abuts against the first connecting ring or the second connecting ring.

[0017] The above technical solution, through the design of the annular slope, satisfies the abutment and fixation of the first connecting ring or the second connecting ring.

[0018] Furthermore, the outer diameter of the clamp matches the outer diameter of the buoyancy joint, and the inner diameter of the buoyancy joint matches the inner diameter of the riser body.

[0019] The above technical solution facilitates the connection of the riser body, buoyancy joint, and clamps.

[0020] In summary, this application includes the following beneficial technical effects:

[0021] The system features a multi-segment riser body structure, with a detachable buoyancy joint between adjacent segments. By connecting the first connecting ring of the riser body to the second connecting ring of the buoyancy joint, the serrated rubber rings between the first and second connecting rings engage. Then, by engaging the two half-rings of the clamp, the annular groove on the inner side of the clamp wraps around the first and second connecting rings. The sloping rubber ring within the annular groove abuts against the first and second connecting rings, and a corrosion-resistant sealing ring maintains the seal at the connection between each segment of the riser body and the buoyancy joint. This design differs from traditional auxiliary welding installation methods, offering advantages such as modular design, quick assembly and disassembly, storage, and multiple leak-proof seals. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this application;

[0023] Figure 2 This is a cross-sectional view of the buoyancy joint in the installation state of this application;

[0024] Figure 3 for Figure 2 Enlarged view of the A structure;

[0025] Figure 4 This is a three-dimensional drawing of the pipe clamp in this application.

[0026] Explanation of the labels in the diagram:

[0027] 1. Water-proof pipe body; 2. Upper flexible joint; 3. Lower flexible joint; 4. Buoyancy joint; 5. Clamp; 6. Cavity; 7. First connecting ring; 8. Second connecting ring; 9. Corrosion-resistant sealing ring; 10. Annular groove; 11. Serrated rubber ring; 12. Sloping rubber ring; 13. Mounting block. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] Example:

[0032] This application discloses a modular, quickly assembled drilling riser. Please refer to [link / reference]. Figure 1 and Figure 4 The system includes a riser body 1, with an upper flexible joint 2 installed at the upper end and a lower flexible joint 3 installed at the lower end. The riser body 1 is composed of multiple tubular segments, and a buoyancy joint 4 is detachably installed between two adjacent tubular segments. A first connecting ring 7 is installed at the port of each tubular segment of the riser body 1. Second connecting rings 8 are fixed at both ends of the buoyancy joint 4, and the second connecting rings 8 are connected to the first connecting rings 7 of the tubular segments. Serrated rubber rings 11 are embedded in the facing surfaces of the first connecting rings 7 and the second connecting rings 8, and the serrated surfaces of the serrated rubber rings 11 are interlocked. Clamps 5 are installed around the first connecting rings 7 and the second connecting rings 8 by quick-release bolts. An annular groove 10 is provided on the inner side. Two beveled rubber rings 12 are bonded to the inner side of the annular groove 10, and the two beveled rubber rings 12 abut against the first connecting ring 7 and the second connecting ring 8 respectively. A corrosion-resistant sealing ring 9 is embedded in the inner edge of the clamp 5. The upper flexible joint 2 facilitates connection to the drilling platform, and the lower flexible joint 3 facilitates connection to the blowout preventer at the wellhead. The principle of the upper flexible joint 2 and the lower flexible joint 3 is a known existing technology, and there are mature products. Therefore, the principle will not be further explained. The design of the upper flexible joint 2 and the lower flexible joint 3 is mainly to increase the flexibility of connection with the drilling platform and the blowout preventer at the wellhead, so that the riser body 1 can withstand the disturbance of external fluids.

[0033] Please see Figure 1 and Figure 2 The buoyancy section 4 has an overall tubular structure, and the shell of the buoyancy section 4 has an annular cavity 6 inside. Combined with its flexible material and the design of the cavity 6, it reduces the self-weight of the riser system, reduces the load on the drilling platform, and provides stability and protection in complex marine environments. The shell of the buoyancy section 4 must be manufactured in accordance with DNVGL-ST-E407 or API 2RD specifications, and the internal foam filling material should meet the fire retardant requirements (IMO Part 8 standard). In deep water environments, the cavity 6 needs to withstand high pressure, so a layered sealing or pressure balancing design is adopted (such as the "diaphragm" sealing technology of the reference jacket).

[0034] Please see Figure 2 and Figure 3 The first connecting ring 7 and the second connecting ring 8 are the same size. The serrated rubber ring 11 of the first connecting ring 7 has a concave serrated surface, while the serrated rubber ring 11 of the second connecting ring 8 has a convex serrated surface. The convex and concave serrated surfaces can easily interlock to maintain the sealing effect of the connection between the first connecting ring 7 and the second connecting ring 8. The mating of the first connecting ring 7 and the second connecting ring 8 can achieve rapid positioning, which facilitates subsequent assembly.

[0035] Please see Figure 1 and Figure 4 The clamp 5 is composed of two semi-rings, and each semi-ring of the clamp 5 has an integral mounting block 13 at both ends. The clamp 5 serves as the primary component for installing the buoyancy section 4. The mounting block 13 is used to install quick-release bolts to lock the two semi-rings.

[0036] Please see Figure 2 and Figure 3 The corrosion-resistant sealing ring 9 is set at the installation gap between the clamp 5 and the buoyancy joint 4. There are two corrosion-resistant sealing rings 9 on the inner edge of the clamp 5, and the two corrosion-resistant sealing rings 9 are respectively set to the first connecting ring 7 and the second connecting ring 8. By setting the corrosion-resistant sealing ring 9, the installation gap between the clamp 5 and the buoyancy joint 4 can be filled to form a leak-proof barrier.

[0037] Please see Figure 2 and Figure 3 The sloping rubber ring 12 is provided with an annular slope, and the annular slope abuts against the first connecting ring 7 or the second connecting ring 8. By providing the sloping rubber ring 12, the gap of the annular groove 10 can be filled, and the sealing effect of the first connecting ring 7 and the second connecting ring 8 can be increased.

[0038] Please see Figure 2 and Figure 3The outer diameter of clamp 5 matches the outer diameter of buoyancy joint 4, and the inner diameter of buoyancy joint 4 matches the inner diameter of riser body 1. This structure can maintain the consistency of the inner diameter at the connection between riser body 1 and buoyancy joint 4, which is beneficial to reducing the resistance to medium flow.

[0039] The implementation principle of this embodiment is as follows: In use, the multi-segment water-proof pipe body 1 is first arranged in the order of its segments. When splicing, the first connecting ring 7 of the water-proof pipe body 1 is connected to the second connecting ring 8 of the buoyancy joint 4, causing the serrated rubber ring 11 between the first connecting ring 7 and the second connecting ring 8 to engage. At this time, by engaging the two half-rings of the clamp 5, the annular groove 10 on the inner side of the clamp 5 is wrapped around the outside of the first connecting ring 7 and the second connecting ring 8, and the sloping rubber ring 12 in the annular groove 10 is connected to the first connecting ring 7. The second connecting ring 8 abuts against the riser body 1, and the corrosion-resistant sealing ring 9 maintains the seal at the connection between the riser body 1 and the buoyancy joint 4. Then, the above installation steps are used to install multiple buoyancy joints 4 sequentially on the surface of the riser body 1. The riser body 1 is then connected to the drilling platform through the upper flexible joint 2 and to the blowout preventer at the wellhead through the lower flexible joint 3. By setting multiple buoyancy joints 4, combined with their flexible material and cavity 6 design, the self-weight of the riser system is reduced, the load on the drilling platform is reduced, and stability and protection functions are provided in complex marine environments.

[0040] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A modular, rapidly assembled drilling riser, comprising a riser body (1), characterized in that: The upper end of the riser pipe body (1) is equipped with an upper flexible joint (2), and the lower end of the riser pipe body (1) is equipped with a lower flexible joint (3). The riser pipe body (1) is composed of multiple tubular segments, and a buoyancy joint (4) is detachably installed between two adjacent tubular segments. A first connecting ring (7) is installed at the port of each tubular segment of the riser pipe body (1). A second connecting ring (8) is fixed at both ends of the buoyancy joint (4), and the second connecting ring (8) is connected to the first connecting ring (7) of the tubular segment. The first connecting ring (7) and the second connecting ring (8) are connected to each other. The opposing surfaces of the connecting rings (8) are each fitted with a serrated rubber ring (11), and the serrated surfaces of the serrated rubber rings (11) are interlocked. The outer periphery of the first connecting ring (7) and the second connecting ring (8) is fitted with a clamp (5) by a quick-release bolt. The inner side of the clamp (5) is provided with an annular groove (10). The inner side of the annular groove (10) is bonded with two sloping rubber rings (12), and the two sloping rubber rings (12) abut against the first connecting ring (7) and the second connecting ring (8) respectively. A corrosion-resistant sealing ring (9) is fitted into the inner edge of the clamp (5).

2. The modular, rapidly assembled drilling riser according to claim 1, characterized in that: The buoyancy section (4) is tubular in shape, and the shell of the buoyancy section (4) has an annular cavity (6) inside.

3. The modular, rapidly assembled drilling riser according to claim 1, characterized in that: The first connecting ring (7) and the second connecting ring (8) are the same size. The serrated rubber ring (11) of the first connecting ring (7) has a concave serrated surface, while the serrated rubber ring (11) of the second connecting ring (8) has a convex serrated surface.

4. The modular, rapidly assembled drilling riser according to claim 1, characterized in that: The clamp (5) is composed of two semi-rings, and each semi-ring of the clamp (5) has an integral mounting block (13) at both ends.

5. A modular, rapidly assembled drilling riser according to claim 1, characterized in that: The corrosion-resistant sealing ring (9) is installed in the gap between the clamp (5) and the buoyancy joint (4). There are two corrosion-resistant sealing rings (9) on the inner edge of the clamp (5), and the two corrosion-resistant sealing rings (9) are respectively set to the first connecting ring (7) and the second connecting ring (8).

6. A modular, rapidly assembled drilling riser according to claim 1, characterized in that: The rubber ring (12) with a slope is provided with an annular slope, and the annular slope abuts against the first connecting ring (7) or the second connecting ring (8).

7. A modular, rapidly assembled drilling riser according to claim 1, characterized in that: The outer diameter of the clamp (5) matches the outer diameter of the buoyancy joint (4), and the inner diameter of the buoyancy joint (4) matches the inner diameter of the water-proof pipe body (1).

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