Seabed suspended span pipeline damper

Abstract

The invention provides a submarine suspended span pipeline damper, which belongs to the technical field of submarine pipeline damping, is arranged on a pipeline used for conveying oil gas and provided with suspended span sections, and comprises an outer pipe, a damping piece and a sealing assembly. Wherein the outer pipe is arranged on the pipeline in a sleeving manner and wraps the periphery of the suspended span section; the damping piece is arranged between the pipeline and the outer pipe and hinged to the pipeline and the outer pipe so that vibration of the pipeline can be transferred to the outer pipe, and part of vibration energy can be absorbed. The two sealing assemblies are arranged at the two ends of the outer pipe correspondingly and used for being connected with the outer circumferential wall of the pipeline so that the outer circumferential wall of the pipeline, the inner circumferential wall of the outer pipe and the adjacent sides of the two sealing assemblies can define a sealed space. According to the seabed suspended span pipeline damper, when a pipeline vibrates, the damping piece absorbs and consumes vibration energy and transmits the vibration energy to the outer pipe at the same time, the outer pipe is damped by seawater during vibration, and therefore a better damping effect is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of submarine pipeline shock absorption, and more specifically, relates to a submarine suspended spanning pipeline damper. Background Art

[0002] As the global demand for energy continues to rise, the offshore oil and gas extraction industry has shown a booming development trend in recent years. Among the many ways of offshore oil and gas storage and transportation, submarine pipelines have gradually become the core mode of offshore oil and gas transportation due to their significant advantages such as large transportation volume, high transportation efficiency and low transportation cost. As an important force in the development of offshore oil and gas, my country has vast offshore oil and gas resources. However, my country is a country prone to earthquakes, and most of its offshore oil and gas fields happen to be located in the Pacific Rim seismic belt.

[0003] Due to the combined influence of multiple factors such as the structural geometry, span length, and site conditions, submarine free-span pipelines often have natural vibration frequencies that are very close to the frequency of submarine seismic vibrations. When this happens, the pipeline will produce a greater amplitude of structural vibration based on the resonance principle. This abnormal vibration may cause a series of serious problems, such as breakage and leakage of submarine pipelines. Summary of the invention

[0004] The object of the present invention is to provide a submarine free-spanning pipeline damper, which is intended to mitigate the vibration of the submarine free-spanning pipeline.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a submarine free-spanning pipeline damper, which is arranged on a pipeline for transporting oil and gas and having a free-spanning section, comprising: An outer pipe is sleeved on the pipeline and wrapped around the outer circumference of the span segment; a damping member, disposed between the pipeline and the outer tube and hingedly connected to the pipeline and the outer tube, so as to transfer the vibration of the pipeline to the outer tube and absorb part of the vibration energy; and Two sealing components are respectively arranged at the two ends of the outer tube and are used to connect with the outer peripheral wall of the pipeline so that the outer peripheral wall of the pipeline, the inner peripheral wall of the outer tube and the adjacent sides of the two sealing components form a sealed space.

[0006] In a possible implementation, the sealing assembly includes: A sealing sleeve, both ends of which are respectively sleeved on the outer peripheral wall of the pipeline and the outer tube; Two clamps are respectively arranged at the two ends of the sealing sleeve and are used to narrow the port of the sealing sleeve so that the inner peripheral wall of the sealing sleeve is connected with the outer peripheral wall of the pipeline or the outer tube.

[0007] In a possible implementation, a first connection portion and a second connection portion are respectively provided on the outer peripheral wall of the pipeline and the outer peripheral wall of the outer tube, and both the first connection portion and the second connection portion adopt a rotating body structure with an L-shaped vertical cross section; The sealing sleeve is provided with a first sealing groove and a second sealing groove, both in an annular shape, on a surface facing the outer tube and suitable for inserting the first connecting part and the second connecting part respectively; Wherein, when the sealing sleeve moves along the axial direction of the pipeline to be sleeved on the outer tube, the first connecting portion and the second connecting portion are respectively inserted into the first sealing groove and the second sealing groove.

[0008] In a possible implementation, a first internal thread is formed on a side of the first connection portion facing the pipeline, and a second internal thread is formed on a side of the second connection portion facing the outer tube; A plurality of first connection blocks suitable for being threadedly connected to the first internal thread are embedded on one side of the sealing sleeve that is in contact with the first internal thread, and a plurality of second connection blocks suitable for being threadedly connected to the second internal thread are embedded on one side of the sealing sleeve that is in contact with the second internal thread. The first connection blocks and the second connection blocks are arranged at intervals along the circumference of the sealing sleeve.

[0009] In a possible implementation manner, the nominal diameters of the first internal thread and the second internal thread gradually decrease along the insertion direction of the sealing sleeve.

[0010] In a possible implementation, a blocking portion extending outward is fixedly provided on one end of the first connecting block and the second connecting block located in the sealing sleeve.

[0011] In a possible implementation, glue storage grooves are provided on the side surfaces of the sealing sleeve that are connected to the first internal thread and the second internal thread, and each of the glue storage grooves is filled with sealant; When the sealing sleeve is connected to the first connecting part and the second connecting part and the sealing sleeve rotates relative to the pipeline and the outer tube, the first internal thread and the second internal thread squeeze the glue storage groove, so that the sealant overflows out of the glue storage groove and fills the gaps between the sealing sleeve and the first internal thread and the second internal thread respectively.

[0012] In a possible implementation, both ends of the sealing sleeve are embedded with an annular support frame, a convex block is fixedly provided on the support frame, the convex block extends from the outer peripheral wall of the sealing sleeve along the radial direction of the sealing sleeve, and a groove is provided on the clamp; When the protrusion is clamped in the groove, the clamp can drive the sealing sleeve to rotate.

[0013] In a possible implementation, the damping element includes: A damping rod is arranged between the pipeline and the outer tube, and one end of the damping rod is hinged to the outer peripheral wall of the pipeline, and the other end of the damping rod is hinged to the inner peripheral wall of the outer tube; The spring is sleeved on the damping rod, and two ends of the spring are respectively fixed to the two ends of the damping rod.

[0014] In a possible implementation, damping pads are fixedly provided on the outer circumferential wall of the pipeline and the inner circumferential wall of the outer tube.

[0015] Compared with the prior art, the submarine suspended-span pipeline damper provided by the present invention has the following beneficial effects: under the action of submarine earthquake, the pipeline vibrates, and the existence of the damping member can realize the transfer of vibration energy from the pipeline to the outer pipe. In this process, the damping member can absorb and consume a part of the vibration energy, thereby playing a role in shock absorption. When the vibration energy is transmitted to the outer pipe, the contact surface between the outer pipe and the seawater is larger, and the viscous resistance of the seawater is greater, which makes the outer pipe subject to greater damping effect of the seawater when vibrating. The seawater acts as additional damping and utilizes the dynamic water effect to further consume the vibration energy, thereby achieving a better shock absorption purpose. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the overall structure of a submarine suspended spanning pipeline shock absorbing device provided by an embodiment of the present invention; Figure 2 A cross-sectional view of a sealing sleeve provided in an embodiment of the present invention when it is not installed; Figure 3 A cross-sectional view of a sealing sleeve in an installed state provided by an embodiment of the present invention; Figure 4 A top view of a submarine suspended spanning pipeline shock absorbing device provided by an embodiment of the present invention; Figure 5 for Figure 4 Sectional view of section AA; Figure 6 for Figure 4 Sectional view of the middle BB section; Figure 7 for Figure 3 Schematic diagram of the enlarged structure of part A.

[0018] In the figure: 1, pipeline; 11, first connecting part; 111, first internal thread; 2, outer tube; 21, second connecting part; 211, second internal thread; 3, damping member; 31, damping rod; 32, spring; 4, sealing assembly; 41, sealing sleeve; 411, first sealing groove; 412, second sealing groove; 42, clamp; 421, groove; 51, first connecting block; 52, second connecting block; 53, supporting frame; 54, protrusion; 6, blocking part; 7, glue storage groove; 8, damping pad. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] See also Figure 1 , Figure 2 and Figure 3 , a submarine free-spanning pipeline damper provided by the present invention is now described. A submarine free-spanning pipeline damper is arranged on a pipeline 1, and the pipeline 1 is used to transport oil and gas, and is arranged in the seabed and has a free-spanning section. The submarine free-spanning pipeline damper includes an outer tube 2, a damping member 3 and two sealing assemblies 4. The outer tube 2 is sleeved on the pipeline 1 and wrapped around the free-spanning section of the pipeline 1. The two ends of the damping member 3 are respectively hinged to the outer circumferential wall of the pipeline 1 and the inner circumferential wall of the outer tube 2, and the rotation plane of the damping member 3 is perpendicular to the axis of the pipeline 1. A plurality of damping members 3 are arranged along the circumference of the pipeline 1, so that the plurality of damping members 3 are in the same plane and are arranged around the outer circumferential wall of the pipeline 1. At the same time, a plurality of damping members 3 in the same plane are a group, and a plurality of groups of damping members 3 are arranged along the axial direction of the pipeline 1.

[0021] Under the action of an undersea earthquake, the pipeline 1 vibrates. The presence of the damping element 3 can realize the transfer of vibration energy from the pipeline 1 to the outer pipe 2. In this process, the damping element 3 can absorb and consume a part of the vibration energy, thereby playing a role in shock absorption. When the vibration energy is transmitted to the outer pipe 2, the contact surface between the outer pipe 2 and the seawater is larger, and the viscous resistance of the seawater is greater. The seawater acts as additional damping and utilizes the dynamic water effect, which makes the outer pipe 2 receive a greater damping effect of the seawater when vibrating, so that the vibration energy is further consumed, thereby achieving a better shock absorption purpose.

[0022] It should be noted that by adjusting the mass of the outer tube 2 or the damping coefficient of the damping element 3, the dynamic characteristics of the outer tube 2 can be changed, and the frequency modulation resonance between the outer tube 2 and the pipeline 1 can be achieved, so that the outer tube 2 and the pipeline 1 vibrate out of phase, thereby achieving better shock absorption. In addition, the outer tube 2 sleeved outside the pipeline 1 is conducive to preventing the pipeline 1 from yielding locally, improving the safety and reliability of the structure of the pipeline 1, and extending the service life of the pipeline 1.

[0023] See also Figure 1 Two sealing components 4 are respectively arranged at the two ends of the outer tube 2, one end of the sealing component 4 is fixedly sleeved on the outer peripheral wall of the pipeline 1, and the other end is fixedly sleeved on the outer peripheral wall of the outer tube 2. The outer peripheral wall of the pipeline 1, the inner peripheral wall of the outer tube 2 and the adjacent sides of the two sealing components 4 form a closed space.

[0024] The sealing assembly 4 effectively isolates the direct contact between seawater and the damping element 3, prevents the seawater from corroding the damping element 3, provides a relatively stable environment for the damping element 3, greatly prolongs the service life of the damping element 3, and reduces the maintenance and replacement costs caused by corrosion.

[0025] In some embodiments, see Figure 2 , Figure 3 and Figure 4 The sealing assembly 4 includes a sealing sleeve 41 and two clamps 42. One end of the sealing sleeve 41 is sleeved on the outer circumferential wall of the pipeline 1, and the other end is sleeved on the outer circumferential wall of the outer tube 2. The sealing sleeve 41 adopts a truncated cone structure that penetrates along the axial direction. The end of the sealing sleeve 41 sleeved on the pipeline 1 is a narrow end, and the end of the sealing sleeve 41 sleeved on the outer tube 2 is a flared end. The two clamps 42 are respectively arranged at both ends of the sealing sleeve 41, and are used to narrow the two ports of the sealing sleeve 41 so that the inner circumferential wall of the sealing sleeve 41 is connected to the outer circumferential wall of the pipeline 1 or the outer tube 2.

[0026] It should be noted that the sealing sleeve 41 is made of rubber material and has a certain elastic deformation, which can meet the space requirement when the distance between the pipeline 1 and the outer tube 2 changes.

[0027] Specifically, when installing the sealing sleeve 41, first clean the outer surfaces of the pipeline 1 and the outer tube 2, apply lubricant on the outer peripheral walls of the pipeline 1 and the outer tube 2, and put the narrow end of the sealing sleeve 41 on the pipeline 1, with the expanded end facing the outer tube 2. Then move along the axial direction of the pipeline 1 toward the pipe opening close to the outer tube 2, so that the expanded end of the sealing sleeve 41 is sleeved on the outer tube 2. Finally, corresponding to the narrow end position and the expanded end position of the sealing sleeve 41, put on the clamp 42 and fix the clamp 42 to complete the installation of the sealing sleeve 41.

[0028] In some embodiments, see Figure 2 and Figure 3The outer peripheral wall of the pipeline 1 and the outer peripheral wall of the outer tube 2 are respectively provided with a first connection part 11 and a second connection part 21, and the first connection part 11 and the second connection part 21 both adopt a rotating body structure with an L-shaped vertical section. The sealing sleeve 41 is provided with a first sealing groove 411 and a second sealing groove 412, both of which are annular and suitable for inserting the first connection part 11 and the second connection part 21, on the surface facing the outer tube 2. When the sealing sleeve 41 moves along the axial direction of the pipeline 1 to be sleeved on the outer tube 2, the first connection part 11 and the second connection part 21 are respectively inserted into the first sealing groove 411 and the second sealing groove 412.

[0029] It should be noted that there is a gap between the first connection part 11 and the outer peripheral wall of the pipeline 1 in the radial direction for accommodating the sealing sleeve 41, and there is a gap between the second connection part 21 and the outer peripheral wall of the outer tube 2 in the radial direction for accommodating the sealing sleeve 41. During the connection between the sealing sleeve 41 and the first connection part 11, the sealing sleeve 41 extends into the gap between the first connection part 11 and the pipeline 1, so that the sealing sleeve 41 is squeezed, thereby pressing the sealing sleeve 41 against the outer wall of the pipeline 1, thereby improving the tightness of the connection between the sealing sleeve 41 and the pipeline 1. Similarly, during the connection between the sealing sleeve 41 and the second connection part 21, the sealing sleeve 41 is tightly attached to the outer wall of the outer tube 2, so that the sealing effect between the sealing sleeve 41 and the outer tube 2 is better.

[0030] The design of the first sealing groove 411 and the second sealing groove 412 respectively increases the contact area and the sealing path between the sealing sleeve 41 and the first connecting part 11 and the second connecting part 21. In a high-pressure seawater environment, seawater needs to follow the complex path of the first sealing groove 411 and the second sealing groove 412 to enter the sealing sleeve 41, which greatly increases the difficulty for seawater to enter the sealing sleeve 41, thereby improving the sealing effect of the sealing sleeve 41.

[0031] In some embodiments, see Figure 2 , Figure 5 and Figure 6 The first connection portion 11 is provided with a first internal thread 111 on the side facing the pipeline 1, and the second connection portion 21 is provided with a second internal thread 211 on the side facing the outer tube 2. A plurality of first connection blocks 51 suitable for threaded connection with the first internal thread 111 are embedded on the side of the sealing sleeve 41 that is in contact with the first internal thread 111, and a plurality of second connection blocks 52 suitable for threaded connection with the second internal thread 211 are embedded on the side of the sealing sleeve 41 that is in contact with the second internal thread 211. The first connection blocks 51 and the second connection blocks 52 are arranged at intervals along the circumference of the sealing sleeve 41.

[0032] When installing the sealing sleeve 41, the sealing sleeve 41 is stretched apart by the pipeline 1 and the outer tube 2, so that the spacing between the adjacent first connecting blocks 51 and the adjacent second connecting blocks 52 becomes larger, ensuring that the sealing sleeve 41 can undergo a certain deformation during installation, thereby reducing the difficulty of installing the sealing sleeve 41. Through the threaded connection between the first internal thread 111 and the first connecting block 51, and the threaded connection between the second internal thread 211 and the second connecting block 52, the sealing sleeve 41 can be installed more conveniently, and the installation can be achieved by simply rotating the sealing sleeve 41. At the same time, the threaded engagement between the first internal thread 111 and the first connecting block 51, and the threaded engagement between the second internal thread 211 and the second connecting block 52 also increase the stability of the sealing sleeve 41, making it less likely for the sealing sleeve 41 to loosen, thereby ensuring the sealing effect of the sealing sleeve 41.

[0033] In some embodiments, see Figure 2 , the nominal diameters of the first internal thread 111 and the second internal thread 211 gradually decrease along the insertion direction of the sealing sleeve 41, so that the first connection part 11 and the second connection part 21 form a gradually thickened structure along the insertion direction of the sealing sleeve 41. On the one hand, this structure facilitates the staff to smoothly insert the sealing sleeve 41 into the first connection part 11 and the second connection part 21 and achieve preliminary positioning, reducing the difficulty of installing the sealing sleeve 41. On the other hand, when installing the sealing sleeve 41, as the sealing sleeve 41 is gradually inserted into the first connection part 11 and the second connection part 21, the first connection part 11 and the second connection part 21 will gradually squeeze the sealing sleeve 41, so that the sealing sleeve 41 and the outer wall of the pipeline 1 and the outer wall of the outer tube 2 fit more and more closely, thereby further enhancing the sealing effect of the sealing sleeve 41.

[0034] In some embodiments, see Figure 7 , the first connection block 51 and the second connection block 52 are both fixedly provided with a blocking portion 6 extending outward at one end located in the sealing sleeve 41. In the marine environment, the pipeline will be affected by various external forces and other factors, and the blocking portion 6 can effectively prevent the first connection block 51 and the second connection block 52 from falling off from the sealing sleeve 41 due to these external forces. At the same time, the blocking portion 6 can not only prevent the first connection block 51 and the second connection block 52 from falling off, but also limit the excessive movement of the first connection block 51 and the second connection block 52 in the sealing sleeve 41, so that the cooperation between the first connection block 51 and the second connection block 52 and the corresponding internal threads is more accurate and stable.

[0035] In some embodiments, see Figure 5 and Figure 6, the side surfaces of the sealing sleeve 41 connected to the first internal thread 111 and the second internal thread 211 are provided with glue storage grooves 7, and each glue storage groove 7 is filled with sealant. When the sealing sleeve 41 is connected to the first connecting portion 11 and the second connecting portion 12, and the sealing sleeve 41 rotates relative to the pipeline 1 and the outer tube 2, the first internal thread 111 and the second internal thread 211 squeeze the glue storage groove 7, so that the sealant overflows to the outside of the glue storage groove 7 and fills the gap between the sealing sleeve 41 and the first internal thread 111 and the second internal thread 211 respectively. Among them, the glue storage groove 7 located on the side surface connected to the first internal thread 111 is arranged between two adjacent first connecting blocks 51, and the glue storage groove 7 located on the side surface connected to the second internal thread 211 is arranged between two adjacent second connecting blocks 52. There are multiple glue storage grooves 7, and they are arranged at intervals along the circumference of the sealing sleeve 41.

[0036] Specifically, during the process of connecting the sealing sleeve 41 with the first connecting part 11 and the second connecting part 21, as the sealing sleeve 41 rotates, the threads on the first internal thread 111 and the second internal thread 211 come into contact with the sealant, so that the sealant adheres to the threads of the first internal thread 111 and the second internal thread 211. The sealant fills the gap between the threads on the first internal thread 111 and the threads on the first connecting block 51, and the gap between the threads on the second internal thread 211 and the threads on the second connecting block 52, thereby ensuring the sealing of the sealing sleeve 41.

[0037] At the same time, since the nominal diameters of the first internal thread 111 and the second internal thread 211 gradually decrease along the insertion direction of the sealing sleeve 41, the first internal thread 111 and the second internal thread 211 will gradually squeeze the glue storage groove 7, and gradually squeeze out the sealant in the glue storage groove 7, thereby ensuring that the sealant can be attached to the first internal thread 111 and the second internal thread 211. After the sealing sleeve 41 is completely connected to the first connecting portion 11 and the second connecting portion 21, the sealant in the glue storage groove 7 is completely squeezed out, so that the sealant further fills the gap between adjacent first connecting blocks 51 and the gap between adjacent second connecting blocks 52, thereby further ensuring the sealing performance of the sealing sleeve 41.

[0038] In some embodiments, see Figure 2 , Figure 3 and Figure 7 , both ends of the sealing sleeve 41 are embedded with an annular support frame 53, and a protrusion 54 is fixedly provided on the support frame 53. The protrusion 54 extends from the outer peripheral wall of the sealing sleeve 41 along the radial direction of the sealing sleeve 41, and a groove 421 is provided on the clamp 42. When the protrusion 54 is clamped in the groove 421, the clamp 42 can drive the sealing sleeve 41 to rotate.

[0039] The support frame 53 supports and reinforces the sealing sleeve 41, so that the sealing sleeve 41 can maintain its basic shape during installation and prevent excessive deformation. At the same time, the support frame 53 provides a relatively rigid structure for the sealing sleeve 41, which facilitates the staff to position the sealing sleeve 41 during installation.

[0040] When installing the sealing sleeve 41, the two clamps 42 are correspondingly installed on the sealing sleeve 41 so that the protrusion 54 is inserted into the groove 421, so that the operator can rotate the sealing sleeve 41 by rotating the clamp 42, so that it is better aligned and connected with the first connection part 11 and the second connection part 21. Compared with directly rotating the sealing sleeve 41, directly rotating the rigid clamp 42 can be more convenient for the operator to operate. After the connection is completed, the two clamps 42 are completely tightened to fix the sealing sleeve 41.

[0041] In some embodiments, see Figure 2 and Figure 3 The damping member 3 includes a damping rod 31 and a spring 32. The damping rod 31 is arranged between the pipeline 1 and the outer tube 2, one end of the damping rod 31 is hinged to the outer peripheral wall of the pipeline 1, and the other end is hinged to the inner peripheral wall of the outer tube 2. The two ends of the spring 32 are respectively fixed to the telescopic end and the fixed end of the damping rod 31, and are sleeved on the damping rod 31.

[0042] When the pipeline 1 vibrates, the damping rod 31 will expand and contract with the relative movement of the pipeline 1 and the outer tube 2, and the spring 32 will absorb the vibration energy through elastic deformation. The damping force generated by the damping rod 31 during the movement will dissipate the vibration energy in the form of heat energy. Due to the hinged connection between the damping rod 31 and the pipeline 1 and the outer tube 2, the damping element 3 can adapt to the vibration of the pipeline 1 in multiple directions, so that it can play a shock-absorbing role in all directions, ensuring the safe operation of the submarine suspended span pipeline.

[0043] In some embodiments, see Figure 2 and Figure 3 , damping pads 8 are fixedly arranged on the outer circumferential wall of the pipeline 1 and the inner circumferential wall of the outer tube 2. The damping pads 8 fixedly arranged on the outer circumferential wall of the pipeline 1 and the inner circumferential wall of the outer tube 2 play an auxiliary role in the shock absorption process. When the pipeline 1 vibrates greatly, friction and extrusion will occur between the relative damping pads 8, further consuming the vibration energy and enhancing the shock absorption effect. At the same time, the damping pads 8 can also absorb and reduce the noise generated by vibration. In the seabed environment, noise may interfere with marine life, and the noise reduction function of the damping pads 8 helps to reduce this impact and protect the marine ecological environment.

[0044] At the same time, the damping pad 8 can also play a certain protective role on the outer wall of the pipeline 1 and the inner wall of the outer pipe 2. During the vibration process, the damping pad 8 can prevent the pipeline 1 from directly colliding or rubbing with the outer pipe 2, avoid pipe wall wear or scratches caused by long-term friction, help maintain the structural integrity and sealing of the pipeline 1 and the outer pipe 2, extend the service life of the pipeline, reduce the risk of oil and gas leakage caused by pipe wall damage, and improve the reliability and durability of the submarine free-span pipeline.

[0045] In summary, the present invention provides a submarine suspended pipeline damper. Compared with the prior art, under the action of a submarine earthquake, the pipeline 1 vibrates. The presence of the damping member 3 can realize the transfer of vibration energy from the pipeline 1 to the outer pipe 2. In this process, the damping member 3 can absorb and consume part of the vibration energy, thereby playing a role in shock absorption. When the vibration energy is transmitted to the outer pipe 2, the contact surface between the outer pipe 2 and the seawater is larger, and the viscous resistance of the seawater is greater, which makes the outer pipe 2 subject to greater damping of the seawater when vibrating, so that the vibration energy is further consumed, thereby achieving a better purpose of shock absorption. In the case of a small earthquake on the seabed, the distance between the pipeline 1 and the outer pipe 2 changes. At this time, the damping is mainly performed by the damping of the damping member 3 and the damping between the outer pipe 2 and the seawater, so that the vibration of the pipeline 1 is weakened. When a large earthquake occurs on the seabed, the distance between the pipeline 1 and the outer pipe 2 is further shortened, so that the relative damping pads 8 collide and rub, thereby further consuming the vibration energy, so that the vibration of the pipeline 1 is weakened.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A submarine free-spanning pipeline damper, arranged on a pipeline (1) for transporting oil and gas and having a free-spanning section, characterized in that: include: An outer pipe (2) is sleeved on the pipeline (1) and surrounds the outer circumference of the span segment; a damping member (3) arranged between the pipeline (1) and the outer tube (2) and hingedly connected to the pipeline (1) and the outer tube (2) so as to transfer the vibration of the pipeline (1) to the outer tube (2) and absorb part of the vibration energy; and Two sealing assemblies (4) are respectively arranged at the two ends of the outer tube (2) and are used to connect with the outer peripheral wall of the pipeline (1), so that the outer peripheral wall of the pipeline (1), the inner peripheral wall of the outer tube (2) and the adjacent sides of the two sealing assemblies (4) form a sealed space.

2. A submarine free-spanning pipeline damper according to claim 1, characterized in that: The sealing assembly (4) comprises: A sealing sleeve (41), the two ends of which are respectively sleeved on the outer peripheral walls of the pipeline (1) and the outer tube (2); Two clamps (42) are respectively arranged at two ends of the sealing sleeve (41) and are used to narrow the port of the sealing sleeve (41) so that the inner peripheral wall of the sealing sleeve (41) is connected to the outer peripheral wall of the pipeline (1) or the outer tube (2).

3. A submarine free-spanning pipeline damper as claimed in claim 2, characterized in that: A first connecting portion (11) and a second connecting portion (21) are respectively provided on the outer peripheral wall of the pipeline (1) and the outer peripheral wall of the outer tube (2), and the first connecting portion (11) and the second connecting portion (21) both adopt a rotating body structure with an L-shaped vertical cross section; The sealing sleeve (41) has a first sealing groove (411) and a second sealing groove (412) on its surface facing the outer tube (2), both of which are in the shape of an annular ring and are suitable for inserting the first connecting portion (11) and the second connecting portion (21) respectively. Wherein, when the sealing sleeve (41) moves along the axial direction of the pipeline (1) to be sleeved on the outer tube (2), the first connecting portion (11) and the second connecting portion (21) are respectively inserted into the first sealing groove (411) and the second sealing groove (412).

4. A submarine free-spanning pipeline damper as claimed in claim 3, characterized in that: The first connection portion (11) is provided with a first internal thread (111) on a side facing the pipeline (1), and the second connection portion (21) is provided with a second internal thread (211) on a side facing the outer tube (2); A plurality of first connection blocks (51) suitable for being threadedly connected to the first internal thread (111) are embedded on one side of the sealing sleeve (41) that is in contact with the first internal thread (111), and a plurality of second connection blocks (52) suitable for being threadedly connected to the second internal thread (211) are embedded on one side of the sealing sleeve (41) that is in contact with the second internal thread (211), wherein the first connection blocks (51) and the second connection blocks (52) are arranged at intervals along the circumference of the sealing sleeve (41).

5. A submarine free-spanning pipeline damper as claimed in claim 4, characterized in that: The nominal diameters of the first internal thread (111) and the second internal thread (211) gradually decrease along the insertion direction of the sealing sleeve (41).

6. A submarine free-spanning pipeline damper as claimed in claim 4, characterized in that: One end of each of the first connecting block (51) and the second connecting block (52) located inside the sealing sleeve (41) is fixedly provided with a blocking portion (6) extending outwards.

7. A submarine free-spanning pipeline damper as claimed in claim 5, characterized in that: The sealing sleeve (41) has a glue storage groove (7) formed on the side thereof connected to the first internal thread (111) and the side thereof connected to the second internal thread (211), and each of the glue storage grooves (7) is filled with a sealing glue; When the sealing sleeve (41) is connected to the first connecting portion (11) and the second connecting portion (12), and the sealing sleeve (41) rotates relative to the pipeline (1) and the outer tube (2), the first internal thread (111) and the second internal thread (211) squeeze the glue storage groove (7), causing the sealant to overflow outside the glue storage groove (7) and fill the gaps between the sealing sleeve (41) and the first internal thread (111) and the second internal thread (211), respectively.

8. The submarine free-spanning pipeline damper according to claim 2, characterized in that: Both ends of the sealing sleeve (41) are embedded with an annular support frame (53), a convex block (54) is fixedly provided on the support frame (53), and the convex block (54) extends from the outer peripheral wall of the sealing sleeve (41) along the radial direction of the sealing sleeve (41), and a groove (421) is provided on the clamp (42); When the protrusion (54) is engaged in the groove (421), the clamp (42) can drive the sealing sleeve (41) to rotate.

9. The submarine free-spanning pipeline damper according to claim 1, characterized in that: The damping member comprises: A damping rod (31) is arranged between the pipeline (1) and the outer tube (2), and one end of the damping rod is hinged to the outer peripheral wall of the pipeline (1), and the other end of the damping rod is hinged to the inner peripheral wall of the outer tube (2); The spring (32) is sleeved on the damping rod (31), and two ends of the spring (32) are respectively fixed to two ends of the damping rod (31).

10. The submarine free-spanning pipeline damper according to claim 1, characterized in that: Damping pads (8) are fixedly arranged on the outer peripheral wall of the pipeline (1) and the inner peripheral wall of the outer tube (2).

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