EO-shaped internal and external pressure-bearing lock catch structure for flexible vertical pipe
By adopting a rotary lock structure combining forward E-shaped steel bars, reverse E-shaped steel bars and O-shaped steel bars in the flexible riser, the problems of tripping and size rebound in the traditional flexible riser in deep water environment are solved, and efficient bending and high-pressure strength effects are achieved.
Patent Information
- Application Number
- CN202510129509.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-05
- Publication Date
- 2025-05-30
AI Technical Summary
The Z-shaped armored layer of traditional flexible risers is prone to problems such as tripping, size rebound and local bending when used underwater, which is difficult to meet the high-pressure strength requirements in deep water environments.
The rotary lock structure is formed by combining forward E-shaped steel bars, reverse E-shaped steel bars and O-shaped steel bars. The self-locking and pressure bearing effect of the compressed-crusting armor layer and the inner pressure bearing armor layer is achieved through opposite winding and gap design.
The flexible riser is freely bending under a certain radius, which improves the production rate and enhances the internal and external pressure strength of the pipeline, avoiding problems such as tripping and size rebound.
Smart Images
Figure CN120062442A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of special pipelines, and particularly to an EO-type internal and external pressure-bearing locking structure for flexible risers. Background Art
[0002] A flexible riser is a special pipeline used for offshore oil and gas exploitation. Usually in a marine dynamic environment, due to the influence of wave currents and tides, the pipeline is constantly in a dynamic environment and is prone to fatigue. It is required that the inside of the pipeline has the characteristic of self-sliding to consume the fatigue impact brought by the dynamic environment on the pipe body. At the same time, the pipeline needs to meet the characteristic of being bendable during use for underwater oil and gas exploitation. In addition, since flexible risers are generally used in deep-water environments, there is a large external pressure on the pipeline, and a large internal pressure difference is easily generated due to the large height difference in deep water. Therefore, the overall circumferential direction of the pipeline needs to have a certain internal and external pressure strength.
[0003] In the past, traditional flexible pipelines were of two types: bonded type and non-bonded type. The bonded type is generally a pipeline structure in which steel cord and steel wire are bonded into a whole through rubber. By the elastic characteristics of rubber molecules, the characteristics of bending and resisting fatigue are realized, and it is usually used on the water surface and platforms; while underwater, the non-bonded type is generally used. The traditional non-bonded armor layer is a Z-type armor layer, which is interlocked through the Z-type sharp corners. However, it has high requirements for the dimensional stability of the steel bars of the lock and high requirements for the winding accuracy of the equipment. At the lock position, the adjacent steel bars are hooked by the sharp corners of the Z. The sharp corner size is small, and it is easy to occur the situation of unhooking. And, in order to achieve a higher pressure, after increasing the thickness of the Z-type, the bending stiffness of the steel bar is improved, and it is relatively difficult to wind and form, and it is easy to generate situations such as dimensional springback, local overbending, and unhooking due to excessive tension. In addition, because the Z-type position is interlocked left and right, the width of the Z-type steel is generally within 20 mm, and the winding production speed is slow. Therefore, this application provides an EO-type internal and external pressure-bearing locking structure for flexible risers to realize the function of a dynamic flexible riser. Summary of the Invention
[0004] In order to enable the flexible riser to freely bend at a certain radius and realize the function of a dynamic flexible riser, this application provides an EO-type internal and external pressure-bearing locking structure for flexible risers.
[0005] An EO-type internal and external pressure-bearing locking structure for flexible risers provided by this application adopts the following technical solutions: An EO-type internal and external pressure-bearing locking structure for flexible risers includes a locking unit. The locking unit includes a forward E-shaped steel bar, a reverse E-shaped steel bar, and two O-shaped steel bars. The forward E-shaped steel bar and the reverse E-shaped steel bar are wound in opposite directions, and the O-shaped steel bar is inserted into the opposite gap between the forward E-shaped steel bar and the reverse E-shaped steel bar.
[0006] Preferably, a plurality of groups of the locking units are provided, and the plurality of groups of the locking units are arranged in sequence. The forward E-shaped steel bars and the reverse E-shaped steel bars of the same locking unit are wound in opposite directions. The forward E-shaped steel bars and the reverse E-shaped steel bars both include an a-gap and a b-gap. The b-gap of the forward E-shaped steel bar faces the a-gap of the reverse E-shaped steel bar, and the a-gap of the forward E-shaped steel bar faces the b-gap of the reverse E-shaped steel bar adjacent to the previous locking unit.
[0007] Preferably, the cross-section formed by combining the a-gap and the b-gap is square, and the O-shaped steel bar is inserted into the a-gap and the b-gap to achieve the effect of fixing the lock.
[0008] Preferably, a gap is reserved between the forward E-shaped steel bar, the reverse E-shaped steel bar and the O-shaped steel bar, and the size of the gap is 0.5 mm - 8 mm.
[0009] Preferably, the width range of both the forward E-shaped steel bar and the reverse E-shaped steel bar is 10 mm - 50 mm, and the thickness range of both is 2 mm - 10 mm.
[0010] Preferably, the size range of the O-shaped steel bar is 1 mm * 1 mm - 8 mm * 8 mm, and the cross-section of the O-shaped steel bar is a rounded square or a regular circle with a diameter range of 1 mm - 8 mm.
[0011] Preferably, when the forward E-shaped steel bar, the reverse E-shaped steel bar and the O-shaped steel bar are used as the outer anti-collapse armor layer, the materials of the three all include 316L, 2205 duplex stainless steel, and 2507 duplex stainless steel. When the forward E-shaped steel bar, the reverse E-shaped steel bar and the O-shaped steel bar are used as the inner pressure-bearing armor layer, the materials of the three all include 20CrMo and 65Mn. The tensile strength of the forward E-shaped steel bar, the reverse E-shaped steel bar and the O-shaped steel bar is 600 - 1000 MPa.
[0012] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application realizes the self-locking and pressure-bearing effects of the anti-collapse armor layer and the inner pressure-bearing armor layer through the rotary lock formed by combining the forward E-shaped steel bar, the reverse E-shaped steel bar and the O-shaped steel bar. According to the designed gap, the EO-type inner and outer pressure-bearing lock mechanism of the flexible riser can be freely bent at a certain radius to realize the function of the dynamic flexible riser; 2. The lock structure of the present application has the advantage of a relatively fast winding production speed, and can effectively improve the production rate. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic structural diagram of the locking unit in the embodiment of the present application.
[0014] Figure 2It is a schematic structural diagram of an EO-type internal and external pressure-bearing locking structure for a flexible vertical pipe in an embodiment of the present application.
[0015] Figure 3 It is a cross-sectional view of the forward E-shaped steel strip and the O-shaped steel strip in an embodiment of the present application.
[0016] Explanation of reference numerals: 1, locking unit; 2, forward E-shaped steel strip; 3, reverse E-shaped steel strip; 4, O-shaped steel strip; 5, a gap; 6, b gap. Detailed implementation manners
[0017] The following further describes the present application in detail Figures 1-3 with reference to the accompanying drawings.
[0018] An embodiment of the present application discloses an EO-type internal and external pressure-bearing locking structure for a flexible vertical pipe. Referring to Figure 1 and Figure 2 , it includes a plurality of locking units 1 spirally wound around the outer side of the carcass or the pipe. The plurality of locking units 1 are arranged in sequence. Each locking unit 1 includes a forward E-shaped steel strip 2, a reverse E-shaped steel strip 3, and two O-shaped steel strips 4. The forward E-shaped steel strip 2 and the reverse E-shaped steel strip 3 are wound oppositely, and the O-shaped steel strip 4 is inserted into the opposite gap between the forward E-shaped steel strip 2 and the reverse E-shaped steel strip 3.
[0019] Referring to Figure 1 , the forward E-shaped steel strip 2 and the reverse E-shaped steel strip 3 of the same locking unit 1 are wound in opposite directions. Both the forward E-shaped steel strip 2 and the reverse E-shaped steel strip 3 include an a gap 5 and a b gap 6. The b gap 6 of the forward E-shaped steel strip 2 is opposite to the a gap 5 of the reverse E-shaped steel strip 3, and the a gap 5 of the forward E-shaped steel strip 2 is opposite to the b gap 6 of the reverse E-shaped steel strip 3 adjacent to the previous locking unit 1. In this embodiment, the cross-section of the combination of the a gap 5 and the b gap 6 is square. The O-shaped steel strip 4 is inserted into the a gap 5 and the b gap 6 to achieve the fixed locking effect. There is a gap reserved between the forward E-shaped steel strip 2, the reverse E-shaped steel strip 3 and the O-shaped steel strip 4, and the size of the gap is 0.5 mm - 8 mm, which is specifically designed according to different pipe diameters and different bending radii.
[0020] Referring to Figure 1 , the width range of both the forward E-shaped steel strip 2 and the reverse E-shaped steel strip 3 is 10 mm - 50 mm, and the thickness range of both is 2 mm - 20 mm. The thickness range after their winding is 4 mm - 20 mm; the size range of the O-shaped steel strip 4 is 1 mm * 1 mm - 8 mm * 8 mm, and the cross-section of the O-shaped steel strip 4 is a rounded square or a regular circle with a diameter range of 1 mm - 8 mm.
[0021] Referring to Figure 1, when the forward E-shaped steel strip 2, the reverse E-shaped steel strip 3, and the O-shaped steel strip 4 are used as the external compressive collapse armor layer, the materials of all three include 316L, 2205 duplex stainless steel, and 2507 duplex stainless steel. When the forward E-shaped steel strip 2, the reverse E-shaped steel strip 3, and the O-shaped steel strip 4 are used as the internal pressure-bearing armor layer, the materials of all three include 20CrMo and 65Mn. The tensile strength of the forward E-shaped steel strip 2, the reverse E-shaped steel strip 3, and the O-shaped steel strip 4 is 600-1000 MPa.
[0022] Refer to Figure 3 , when the buckle structure of the present application is used as the internal pressure-bearing armor layer, the cross-sections of the forward E-shaped steel strip 2 and the reverse E-shaped steel strip 3 are the same. Therefore, only the forward E-shaped steel strip 2 is taken as an example for description. Among them, the cross-section of the E-shaped steel strip is divided into seven parts A, B, C, D, E, F, and G according to Figure 3 , and the cross-section of the O-shaped steel strip 4 is represented by H. Embodiment
[0023] In Embodiment 1, the width of A is 3 mm, the width of B is 6 mm, the width of C is 8 mm, the width of D is 6 mm, the width of E is 3 mm, the width of F is 6 mm, the width of G is 26 mm, and the width of H is 4 mm; the materials of the forward E-shaped steel strip 2, the reverse E-shaped steel strip 3, and the O-shaped steel strip 4 are 20CrMo, the tensile strength is 800 MPa, the elastic modulus is 200000 MPa, the inner diameter of the wound pipe is 200 mm, the thickness of the wound EO combination is 12.2 mm, the winding pitch of the forward E-shaped steel strip 2 and the reverse E-shaped steel strip 3 is 28 mm, the calculated pipe bending radius is 3206 mm, the calculated pipe burst strength is 44 MPa, and the compressive collapse strength is 15 MPa. Embodiment
[0024] The difference between Embodiment 2 and Embodiment 1 is that: the size of C is adjusted to 12 mm, the size of B is adjusted to 10 mm, the size of F is adjusted to 10 mm, and the total winding thickness is 20.2 mm; the materials of the forward E-shaped steel strip 2, the reverse E-shaped steel strip 3, and the O-shaped steel strip 4 are 20CrMo, the tensile strength is 800 MPa, the elastic modulus is 200000 MPa, the inner diameter of the wound pipe is 200 mm, the thickness of the wound EO combination is 20.2 mm, the winding pitch of the forward E-shaped steel strip 2 and the reverse E-shaped steel strip 3 is 40 mm, the calculated pipe bending radius is 1602 mm, the calculated pipe burst strength is 56 MPa, and the compressive collapse strength is 25 MPa.
[0025] The specific parameter settings of Embodiment 1 and Embodiment 2 are both relatively optimal solutions of the pressure-bearing buckle of the present application, which can fully exert the function of the flexible riser.
[0026] The implementation principle of the EO-type internal and external pressure-bearing lock structure for a flexible riser in an embodiment of the present application is as follows: The present application uses a rotating lock formed by combining a forward E-shaped steel strip, a reverse E-shaped steel strip, and an O-shaped steel strip to achieve the self-locking and pressure-bearing effects of the crush-resistant armor layer and the internal pressure-bearing armor layer. According to the design gap, the EO-type internal and external pressure-bearing lock mechanism of the flexible riser can freely bend at a certain radius to achieve the function of a dynamic flexible riser.
[0027] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.
Claims
1. An EO type internal and external pressure-bearing lock structure for a flexible riser, characterized in that: The invention comprises a locking unit (1), wherein the locking unit (1) comprises a forward E-shaped steel bar (2), a reverse E-shaped steel bar (3) and two O-shaped steel bars (4), wherein the forward E-shaped steel bar (2) and the reverse E-shaped steel bar (3) are wound in opposite directions, and the O-shaped steel bar (4) is inserted into the opposite gaps between the forward E-shaped steel bar (2) and the reverse E-shaped steel bar (3).
2. The EO type internal and external pressure-bearing locking structure for a flexible riser according to claim 1, characterized in that: The locking units (1) are provided with a plurality of groups, and the plurality of groups of locking units (1) are arranged in sequence. The forward E-shaped steel bar (2) and the reverse E-shaped steel bar (3) of the same locking unit (1) are wound in opposite directions. The forward E-shaped steel bar (2) and the reverse E-shaped steel bar (3) both include an a gap (5) and a b gap (6). The b gap (6) of the forward E-shaped steel bar (2) is opposite to the a gap (5) of the reverse E-shaped steel bar (3), and the a gap (5) of the forward E-shaped steel bar (2) is opposite to the b gap (6) of the reverse E-shaped steel bar (3) adjacent to the previous locking unit (1).
3. The EO type internal and external pressure-bearing locking structure for a flexible riser according to claim 2, characterized in that: The cross-section of the a gap (5) and the b gap (6) after combination is square, and the O-shaped steel bar (4) is inserted into the a gap (5) and the b gap (6) to achieve a fixed locking effect.
4. The EO type internal and external pressure-bearing locking structure for a flexible riser according to claim 1, characterized in that: A gap is reserved between the positive E-shaped steel bar (2), the negative E-shaped steel bar (3) and the O-shaped steel bar (4), and the size of the gap is 0.5 mm-8 mm.
5. The EO type internal and external pressure-bearing locking structure for a flexible riser according to claim 1, characterized in that: The width of the positive E-shaped steel bar (2) and the negative E-shaped steel bar (3) are both in the range of 10 mm to 50 mm, and the thickness is both in the range of 2 mm to 10 mm.
6. The EO type internal and external pressure-bearing locking structure for a flexible riser according to claim 1, characterized in that: The size range of the O-shaped steel bar (4) is 1mm*1mm-8mm*8mm, and the cross-section of the O-shaped steel bar (4) is a rounded square or a perfect circle with a diameter range of 1mm-8mm.
7. The EO type internal and external pressure-bearing locking structure for a flexible riser according to claim 1, characterized in that: When the forward E-shaped steel bar (2), the reverse E-shaped steel bar (3) and the O-shaped steel bar (4) are used as an external compression-resistant armor layer, the materials of the three include 316L, 2205 duplex stainless steel and 2507 duplex stainless steel. When the forward E-shaped steel bar (2), the reverse E-shaped steel bar (3) and the O-shaped steel bar (4) are used as an internal pressure-bearing armor layer, the materials of the three include 20CrMo and 65Mn. The tensile strength of the forward E-shaped steel bar (2), the reverse E-shaped steel bar (3) and the O-shaped steel bar (4) is 600-1000MPa.