A fixed riser suspension device capable of bearing high pressure

Abstract

The utility model discloses a high-pressure-bearing fixed riser suspension device, which includes a suspension boss and a bottom plate, wherein the bottom plate is arranged at both ends of the suspension boss, a transition section is arranged on the suspension boss, a long fixed arm thick section is arranged on the transition section, a welding section is arranged on the bottom plate, a short fixed arm thick section is arranged on the welding section, a slope transition section is arranged between the short fixed arm thick section and the long fixed arm thick section, the welding section is connected to the fixed riser, and the suspension boss is fixed on the conductor frame to connect and limit the fixed riser to the conductor frame. The high-pressure-bearing fixed riser suspension device provided by the utility model is produced by integral forging including different pipe diameters, and the different pipe diameter sections are transitioned in consideration of specific design ratios to withstand the displacement load of the riser and the conductor frame on the extreme wave flow and the high pressure borne by the conveying medium, and to ensure the weldability of the sea pipe and the joint.

Description

Technical Field

[0001] The utility model belongs to the field of deep-water ocean engineering, and in particular relates to a fixed riser suspension device capable of bearing high pressure. Background Art

[0002] In marine engineering, fixed risers are important facilities that connect submarine pipelines and platform pipelines to transmit fluids such as oil and gas. Due to the complexity of the marine environment, risers need to withstand a variety of complex working conditions such as high pressure, high temperature, waves, and currents. In the prior art, a suspension device is usually used to fix the riser on the jacket clamp by welding it to the riser.

[0003] There are some problems in the design and manufacturing of existing suspension devices. For example, stress concentration may occur during welding, resulting in reduced strength at the weld. At the same time, existing suspension devices may not meet the working requirements in high-pressure environments. In addition, during the design and manufacturing process of suspension devices, they often need to meet a variety of different specifications, such as DNV specifications and ASME specifications. These specifications may differ in some key parameters, such as wall thickness, welding quality, material selection, etc., which brings certain difficulties to the design and manufacturing of suspension devices.

[0004] Therefore, it is urgent to design a fixed riser suspension device that can withstand high pressure to solve the above-mentioned problem of riser suspension under high pressure. Utility Model Content

[0005] In order to solve the problem mentioned in the background technology that stress concentration may be generated during the welding process, resulting in reduced strength at the weld, the existing suspension device may not be able to meet the working requirements under high-pressure environment. During the design and manufacturing process of the suspension device, it is often necessary to meet technical problems required by multiple different specifications. A fixed riser suspension device that can withstand high pressure is provided to solve the problem of riser suspension under high pressure.

[0006] In order to achieve the above-mentioned purpose, the specific technical scheme of the high-pressure-bearing fixed riser suspension device of the utility model is as follows:

[0007] A fixed riser suspension device capable of bearing high pressure comprises a suspension boss and a base plate, wherein the base plate is arranged at both ends of the suspension boss, a transition section is arranged on the suspension boss, a long fixed arm thick section is arranged on the transition section, a welding cut is arranged on the base plate, a short fixed arm thick section is arranged on the welding cut, a slope transition section is arranged between the short fixed arm thick section and the long fixed arm thick section, the welding cut is connected to the fixed riser, and the suspension boss is fixed on the conductor frame to connect and limit the fixed riser to the conductor frame.

[0008] Furthermore, the hanging boss is in a circular ring shape, the hanging boss abuts against the bearing port of the conductor frame, and the welding cutouts at both ends of the hanging boss are connected to fixed risers.

[0009] Furthermore, the welding section comprises a first welding section and a second welding section, the first welding section and the second welding section are symmetrical along the axis, the first welding section is welded to the first fixed riser port, and the second welding section is welded to the second fixed riser port.

[0010] Furthermore, the long fixed arm thick section includes a first long fixed arm thick section and a second long fixed arm thick section, the first long fixed arm thick section and the second long fixed arm thick section are both vertically connected to both sides of the suspension boss, and a transition section is connected between the first long fixed arm thick section and the second long fixed arm thick section and the suspension boss.

[0011] Furthermore, the transition section includes a first transition section and a second transition section, the first transition section is connected between the first long fixed arm thick section and the suspension boss, the second transition section is connected between the second long fixed arm thick section and the suspension boss, and the first transition section and the second transition section are both arc-shaped.

[0012] Furthermore, the slope transition section includes a first slope transition section and a second slope transition section, the first slope transition section is connected to the first long fixed thick wall section, the second slope transition section is connected to the second long fixed thick wall section, and the first slope transition section and the second slope transition section are both connected to a short fixed arm thick section.

[0013] Furthermore, the short fixed arm plate section includes a first short fixed arm thick section and a second short fixed arm thick section, the first short fixed arm thick section is connected between the first slope transition section and the first welding section, and the second short fixed arm thick section is connected between the second slope transition section and the second welding section.

[0014] Furthermore, the length of the first short fixed arm thick section and the second short fixed arm thick section should be at least four times the elastic length of the fixed riser, and the elastic length is defined as follows:

[0015]

[0016] in: , is the elastic length of the pipeline; r, is the radius of the neutral plane of the pipeline; t, is the wall thickness of the pipeline; v, is the Poisson's ratio of the pipeline material.

[0017] Furthermore, the bottom plate includes an upper bottom plate and a lower bottom plate, the upper bottom plate is welded on the first welding cutout, and the lower bottom plate is welded on the second welding cutout.

[0018] Furthermore, heat shrink tapes are connected between the first welding cutout and the second welding cutout and the first fixed riser and the second fixed riser.

[0019] The high-pressure-bearing fixed riser suspension device of the utility model has the following advantages:

[0020] By setting a suspension boss, the suspension boss is an annular boss extending outward perpendicular to the outer wall of the riser and is located in the middle of the entire suspension device. The two sides of the suspension boss are connected in sequence with a transition section, a long fixed arm thick section, a slope transition section, a short fixed arm thick section and a welding section. A fixed riser is welded on the welding section, so that the suspension boss is suspended on the conductor frame, thereby realizing the connection and limit between the fixed riser and the conductor frame. The present application is produced by integral forging including different pipe diameters, and different pipe diameter sections are over-considered in specific design proportions to withstand the displacement load of the riser and the conductor frame on the extreme wave flow and the high pressure borne by the conveying medium, and to ensure the weldability of the sea pipe and the joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an overall schematic diagram of the utility model of a fixed riser suspension device capable of bearing high pressure.

[0022] Description of the markings in the figure:

[0023] 1. Suspension boss; 2. First welding cut; 3. Second welding cut; 4. First long fixed arm thick section; 5. Second long fixed arm thick section; 6. First transition section; 7. Second transition section; 8. First slope transition section; 9. Second slope transition section; 10. First short fixed arm thick section; 11. Second short fixed arm thick section; 12. Upper base plate; 13. Lower base plate. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0025] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0026] Please refer to the attached Figure 1 The utility model describes a fixed riser suspension device capable of bearing high pressure.

[0027] like Figure 1As shown, the high-pressure-bearing fixed riser suspension device in the utility model comprises a suspension boss 1 and a bottom plate, the bottom plate is arranged at both ends of the suspension boss 1, a transition section is arranged on the suspension boss 1, a long fixed arm thick section is arranged on the transition section, a welding section is arranged on the bottom plate, a short fixed arm thick section is arranged on the welding section, a slope transition section is arranged between the short fixed arm thick section and the long fixed arm thick section, the welding section is connected to the fixed riser, and the suspension boss is fixed on the catheter frame to connect and limit the fixed riser with the catheter frame. By setting the suspension boss 1, the suspension boss 1 is an annular boss extending outward perpendicular to the outer wall direction of the riser and is located in the middle of the entire suspension device, and the two sides of the suspension boss 1 are connected with a transition section, a long fixed arm thick section, a slope transition section, a short fixed arm thick section and a welding section in sequence, and a fixed riser is welded on the welding section, so that the suspension boss 1 is suspended on the catheter frame, thereby realizing the connection and limitation between the fixed riser and the catheter frame. The present application is produced by integral forging including different pipe diameters, and the different pipe diameter sections are excessively considered in a specific design ratio to withstand the displacement load of the riser and the conductor frame under extreme wave flow and the high pressure borne by the conveying medium, and to ensure the weldability of the sea pipe and the joint.

[0028] Further, if Figure 1 As shown, the suspension boss 1 is in a circular shape, the suspension boss 1 abuts against the bearing port of the pipe frame, and the welded cutouts at both ends of the suspension boss 1 are connected to fixed risers; the long fixed arm thick section includes a first long fixed arm thick section 4 and a second long fixed arm thick section 5, the first long fixed arm thick section 4 and the second long fixed arm thick section 5 are vertically connected to both sides of the suspension boss 1, and a transition section is connected between the first long fixed arm thick section 4 and the second long fixed arm thick section 5 and the suspension boss 1;

[0029] The transition section includes a first transition section 6 and a second transition section 7. The first transition section 6 is connected between the first long fixed arm thick section 4 and the suspension boss 1, and the second transition section 7 is connected between the second long fixed arm thick section 5 and the suspension boss 1. The first transition section 6 and the second transition section 7 are both arc-shaped.

[0030] In this embodiment, preferably, the suspension boss 1 is annular and has a certain thickness. The first long fixed arm thick section 4 and the second long fixed arm thick section 5 are symmetrically connected on both sides of the suspension boss 1. The first long fixed arm thick section 4 and the second long fixed arm thick section 5 should meet the stress strength requirements of the pressure vessel pressure design specification ASME VIII under the combined action of wave flow and pressure temperature. At the same time, the length should not be less than four times the elastic length of the pipeline.

[0031] Preferably, the first transition section 1 is fixedly connected between the first long fixed arm thick section 4 and the suspension boss 1, the second transition section 7 is fixedly connected between the second long fixed arm thick section 5 and the suspension boss 1, the first transition section 6 and the second transition section 7 are both arranged in a circular arc shape, the radius of the first transition section 6 and the second transition section 7 should not be less than 30 mm, and the thickness of the suspension boss 1 can be set to 130 mm.

[0032] Further, if Figure 1 As shown, the slope transition section includes a first slope transition section 8 and a second slope transition section 9, the first slope transition section 8 is connected to the first long fixed thick wall section 4, the second slope transition section 9 is connected to the second long fixed thick wall section 5, and the first slope transition section 8 and the second slope transition section 9 are both connected with a short fixed arm thick section; the short fixed arm plate section includes a first short fixed arm thick section 10 and a second short fixed arm thick section 11, the first short fixed arm thick section 10 is connected between the first slope transition section 8 and the first welding section 2, and the second short fixed arm thick section 11 is connected between the second slope transition section 9 and the second welding section 3.

[0033] In this embodiment, preferably, the first slope transition section 8 is fixedly connected between the first long fixed thick-wall section 4 and the first short fixed arm thick section 10, and the second slope transition section 9 is fixedly connected between the second long fixed thick-wall section 5 and the second short fixed arm thick section 11. In order to reduce the stress concentration problem caused by geometric deformation, the transition slope of the first slope transition section 8 and the second slope transition section 9 shall not be greater than 1:4.

[0034] Preferably, the first short fixed arm thick section 10 and the second short fixed arm thick section 11 have the same outer diameter and wall thickness as the fixed riser, and are welded to the fixed riser through a welding section that meets the riser design welding assessment requirements to form a whole.

[0035] In addition, according to the DNV specification system requirements for sea pipes and risers, the wall thickness of the first short fixed arm thick section 10 and the second short fixed arm thick section 11 is the same as that of the riser, and the DNV specification is used for strength verification. At the same time, in order to eliminate the welding stress concentration problem caused by welding the first welding cut 2 and the second welding cut 3; the length of the first short fixed arm thick section 10 and the second short fixed arm thick section 11 should be at least four times the elastic length of the riser pipe.

[0036] The elastic length is defined as follows:

[0037]

[0038] in:

[0039] , elastic length of the pipe;

[0040] r, radius of the neutral plane of the pipe;

[0041] t, pipe wall thickness;

[0042] v, Poisson’s ratio of the pipe material.

[0043] Further, if Figure 1 As shown, the base plate includes an upper base plate 12 and a lower base plate 13, the upper base plate 12 is welded on the first welding section 2, and the lower base plate 13 is welded on the second welding section 3; heat shrink tapes are connected between the first welding section 2 and the second welding section 3 and the first fixed riser and the second fixed riser.

[0044] In this embodiment, preferably, the upper base plate 12 is welded to the end of the first welding section 2, and the lower base plate 13 is welded to the end of the second welding section 3, so that the whole is hollow; the welding nodes between the first welding section 2 and the second welding section 3 and the first fixed riser and the second fixed riser are protected by heat shrink tape.

[0045] The analysis was carried out through modeling with the large-scale finite element software ABAQUS. The model conditions took into account the loads at various stages of the pipe riser pressure test and operation. The design specifications are DNV-ST-F101 and the pressure vessel design specification ASME Ⅷ. The outer surface of the fixed riser suspension device is protected by anti-corrosion coating.

[0046] The working principle of the high-pressure-bearing fixed riser suspension device of the utility model is as follows:

[0047] On land, the first welding cutout 2 and the second welding cutout 3 are pre-connected with the first fixed riser and the second fixed riser, and the nodes are treated with anti-corrosion. Then, an onshore pressure test is performed. After the pressure test meets the requirements, the suspension boss 1 is placed on the jacket suspension flange clamp, so that the first fixed riser and the second fixed riser are connected and limited with the jacket through the device and other riser clamps.

[0048] Based on a fixed riser suspension device capable of bearing high pressure, the utility model sets a suspension boss 1, which is an annular boss extending outward perpendicular to the outer wall of the riser and is located in the middle of the entire suspension device. The two sides of the suspension boss are connected in sequence with a first transition section 6, a second transition section 7, a first long fixed arm thick section 4, a second long fixed arm thick section 5, a first slope transition section 8, a second slope transition section 9, a first short fixed arm thick section 10, a second short fixed arm thick section 11, a first welding section 2 and a second welding section 3. The first welding section 2 and the second welding section 3 are welded with a first fixed riser and a second fixed riser, so that the suspension boss 1 is suspended on the conductor frame, thereby realizing the connection and limit between the first fixed riser and the second fixed riser and the conductor frame. The present application is produced by integral forging including different pipe diameters, and different pipe diameter sections are excessively considered in a specific design ratio to withstand the displacement load of the riser and the conductor frame on the extreme wave flow and the high pressure borne by the conveying medium, and to ensure the weldability of the sea pipe and the joint.

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A fixed riser suspension device capable of bearing high pressure, characterized in that: It includes a hanging boss and a base plate. The base plate is arranged at both ends of the hanging boss. A transition section is arranged on the hanging boss. A long fixed arm thick section is arranged on the transition section. A welding section is arranged on the base plate. A short fixed arm thick section is arranged on the welding section. A slope transition section is arranged between the short fixed arm thick section and the long fixed arm thick section. The welding section is connected to the fixed riser. The hanging boss is fixed on the conductor frame to connect and limit the fixed riser and the conductor frame.

2. The high-pressure-bearing fixed riser suspension device according to claim 1, characterized in that: The hanging boss is in a circular shape, and the hanging boss abuts against the bearing port of the conductor frame. The welding cutouts at both ends of the hanging boss are connected with fixed risers.

3. The high-pressure-bearing fixed riser suspension device according to claim 2, characterized in that: The welding section comprises a first welding section and a second welding section, the first welding section and the second welding section are symmetrical along the axis, the first welding section is welded to the first fixed riser port, and the second welding section is welded to the second fixed riser port.

4. The high-pressure-bearing fixed riser suspension device according to claim 1, characterized in that: The long fixed arm thick section includes a first long fixed arm thick section and a second long fixed arm thick section, both of which are vertically connected to both sides of the suspension boss, and a transition section is connected between the first long fixed arm thick section and the second long fixed arm thick section and the suspension boss.

5. The high-pressure-bearing fixed riser suspension device according to claim 4, characterized in that: The transition section includes a first transition section and a second transition section. The first transition section is connected between the first long fixed arm thick section and the suspension boss. The second transition section is connected between the second long fixed arm thick section and the suspension boss. Both the first transition section and the second transition section are arc-shaped.

6. The high-pressure-bearing fixed riser suspension device according to claim 1, characterized in that: The slope transition section includes a first slope transition section and a second slope transition section, the first slope transition section is connected to the first long fixed thick wall section, the second slope transition section is connected to the second long fixed thick wall section, and the first slope transition section and the second slope transition section are both connected to a short fixed arm thick section.

7. The high-pressure-bearing fixed riser suspension device according to claim 6, characterized in that: The short fixed arm plate section includes a first short fixed arm thick section and a second short fixed arm thick section. The first short fixed arm thick section is connected between the first slope transition section and the first welding section, and the second short fixed arm thick section is connected between the second slope transition section and the second welding section.

8. The high-pressure-bearing fixed riser suspension device according to claim 7, characterized in that: The length of the first short fixed arm thick section and the second short fixed arm thick section shall be at least four times the elastic length of the fixed riser, which is defined as follows: , is the elastic length of the pipeline; r, is the radius of the neutral plane of the pipeline; t, is the wall thickness of the pipeline; v, is the Poisson's ratio of the pipeline material.

9. The high-pressure-bearing fixed riser suspension device according to claim 1, characterized in that: The bottom plate comprises an upper bottom plate and a lower bottom plate, the upper bottom plate is welded on the first welding cutout, and the lower bottom plate is welded on the second welding cutout.

10. The high-pressure-bearing fixed riser suspension device according to claim 9, characterized in that: Heat shrink tapes are connected between the first welding cutout and the second welding cutout and the first fixed riser and the second fixed riser.

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