Deepwater dynamic umbilical cable

Abstract

A deepwater dynamic umbilical cable disclosed by the present invention comprises a body, the body comprises a core wire unit (1) and a sheath unit (2), the sheath unit (2) comprises an outer layer of the core wire unit (1), the sheath unit (2) comprises an armor layer (2.1), the inner side of the armor layer (2.1) is provided with a pressure-resistant sheath layer (2.2), the pressure-resistant sheath layer (2.2) is formed by buckling a plurality of inner fasteners (2.2. 2) and a plurality of outer fasteners (2.2. 1) into a ring shape, and the outer fasteners (2.2. 2) are arranged on the inner side of the armor layer (2.1). The two ends of any inner fastener (2.2. 2) are buckled with the two adjacent outer fasteners (2.2. 1) respectively, the two ends of any outer fastener (2.2. 1) are buckled with the two adjacent inner fasteners (2.2. 2) respectively, and the inner fasteners (2.2. 2) and the outer fasteners (2.2. 1) are connected in a radial buckling mode. The invention provides a deepwater dynamic umbilical cable which is used under deep sea conditions and ensures the service life of the umbilical cable.

Description

Technical Field

[0001] The present invention belongs to the field of umbilical cables, and particularly relates to a deep-water dynamic umbilical cable. Background Art

[0002] With the transformation and upgrading of the global energy structure, the development of marine resources has gradually moved from shallow waters to deep and far seas. Along with the large-scale development of deep-sea mineral resources, deep and far-sea wind power development, deep-sea oil and gas, etc., the demand for electricity in deep and far seas has been greatly increased, and the high-reliability requirements for submarine umbilical cables, which are core equipment indispensable for deep-sea energy development, have also been improved.

[0003] Traditional umbilical cables mainly use wire armor as mechanical strength protection. However, as the water depth increases to below 1000 meters, traditional wire armor is prone to various failure problems under the action of marine environmental loads and tensions during service, and its strength can no longer meet the requirements of deep-sea applications. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a deep-water dynamic umbilical cable that meets the deep-sea use conditions and ensures the service life of the umbilical cable.

[0005] The technical solution adopted by the present invention to solve the above problems is a deep-water dynamic umbilical cable, including a body. The body includes a core wire unit and a sheath unit. The sheath unit is located on the outer layer of the core wire unit. The sheath unit includes an armor layer. An anti-compression sheath layer is provided inside the armor layer. The anti-compression sheath layer is formed into a ring by a plurality of inner fasteners and a plurality of outer fasteners. The two ends of any one of the inner fasteners are respectively buckled with two adjacent outer fasteners, and the two ends of any one of the outer fasteners are respectively buckled with two adjacent inner fasteners. The inner fasteners and the outer fasteners are connected by radial buckling.

[0006] Compared with the prior art, the advantages of the present invention are as follows: An anti-compression sheath layer structure is added inside the armor layer. The anti-compression sheath layer is formed into a ring by itself. The structure of the anti-compression sheath layer does not need to rely on the core wire unit for forming like the armor layer, so it has good stability by itself, is less affected by deep-ocean current changes, and is not easily prone to failure. The anti-compression sheath layer is mainly made of steel, and its structural strength is far superior to that of the core wire unit. Using the anti-compression sheath layer as the winding matrix of the armor layer, the armor layer is not easily deformed due to the deformation of the winding matrix, and thus is not easily prone to failure. At the same time, the anti-compression sheath layer is formed by radial buckling connection. In the deep-sea environment, the deep-sea pressure received by the body is mainly radial, so that the radial buckling structure of the anti-compression sheath layer can be buckled more firmly, and the protection strength of the sheath unit is further enhanced by using the deep-sea pressure, thereby ensuring the service life of the umbilical cable in the deep sea.

[0007] As an improvement of the present invention, two outer buckle blocks facing the inner buckle are provided at both ends of the outer buckle. An outer buckle groove facing the inner buckle is formed between the two outer buckle blocks on the same outer buckle. Two inner buckle blocks facing the outer buckle are provided at both ends of the inner buckle. The width of the outer buckle groove is greater than the sum of the widths of the two inner buckle blocks buckled into the outer buckle groove. Through the above improvement, when the compressive sheath layer wraps the core wire unit, due to the overly rigid structure, the reciprocating movement of the compressive sheath layer under the influence of ocean currents causes wear and cracking of the compressive sheath layer. Therefore, on the premise of not affecting the connection integrity of the compressive sheath layer, the deformation gap of the buckle connection is increased, so that the compressive sheath layer has flexible deformability, has better adaptability to the deep current environment, and can also provide space for the compressive sheath layer to shrink in diameter, so that there is also a deformation space between the compressive sheath layer and the core wire unit. The deformation difference between the compressive sheath layer and the core wire unit has self-adjustability, reducing the probability of continuous damage between the compressive sheath layer and the core wire unit. That is, when one of the compressive sheath layer and the core wire unit is damaged, it will destroy the overall balance of the structure and cause successive damage to the other unit.

[0008] As an improvement of the present invention, a layer of core wire wrapping tape is wound around the outer layer of the core wire unit. A water blocking layer is provided between the core wire wrapping tape and the compressive sheath layer. The water blocking layer is composed of water-absorbing and expanding rubber. Under normal conditions, there is a gap between the water blocking layer and the compressive sheath layer. Through the above improvement, the design of the core wire wrapping tape is used to shape the core wire unit to ensure that the core wire unit is generally circular, so as to ensure the high-quality formation of the water blocking layer and avoid uneven thickness of the water blocking layer, which may cause uneven extrusion pressure on the core wire unit during subsequent water absorption and expansion. The design of the gap between the water blocking layer and the compressive sheath layer under normal conditions facilitates the installation and formation of the compressive sheath layer on the outer layer of the water blocking layer, leaving an installation adjustment space. Then, during use, the water blocking layer absorbs water and expands, eliminating the gap, thereby ensuring the overall distribution uniformity and structural tightness of the body.

[0009] As an improvement of the present invention, an inner abutting block facing the outer fastener is provided at the center of the inner fastener. An inner fastening groove is provided between the inner abutting block and the inner fastening blocks at both ends. The two inner fastening grooves are respectively engaged with the outer fastening blocks on two adjacent outer fasteners. Through this improvement, before installing the armored layer or before the water-blocking layer expands, the compressive sheath layer will be subjected to a 360-degree radial pressure, causing the compressive sheath layer to be squeezed and reduced in diameter. Without the design of the inner abutting block, the two outer fasteners will contract and abut against each other, resulting in a decrease in the engagement connection force between the outer fastening block and the inner fastening block, causing the connection between the outer fastening block and the inner fastening block to become loose, which is not conducive to the use stability of the compressive sheath layer. After adding the design of the inner abutting block, in the case of squeezing and reducing the diameter, the two adjacent outer fasteners will squeeze and tighten the inner abutting block, thereby ensuring the firm connection between the outer fastener and the inner fastener.

[0010] As an improvement of the present invention, the width of the inner fastening groove is greater than the width of the outer fastening block. Through this improvement, after ensuring the stability of the cooperation between the inner fastener and the outer fastener in the contracted state or the expanded state, that is, after ensuring the stability of the compressive sheath layer during installation and use, by designing the width of the inner fastening groove to be greater than the width of the outer fastening block, the installation difficulty between the inner fastener and the outer fastener can be reduced, and the installation efficiency can be improved.

[0011] As an improvement of the present invention, the circumferential connection surface between the inner fastening block and the outer fastening block is in a corrugated shape that fits each other, and the circumferential connection surface between the inner abutting block and the outer fastening block is also in a corrugated shape that fits each other. Moreover, the corrugation amplitude of the circumferential connection surface between the inner fastening block and the outer fastening block and the corrugation amplitude of the circumferential connection surface between the inner abutting block and the outer fastening block are not greater than the width difference between the inner fastening groove and the outer fastening block. Through this improvement, the circumferential connection surface between the inner fastening block and the outer fastening block and the circumferential connection surface between the inner abutting block and the outer fastening block are designed in a corrugated shape, which can not only increase the connection firmness between the inner fastening block and the outer fastening block and between the inner abutting block and the outer fastening block, reduce the probability of radial separation, but also extend the length of the circumferential connection surface between the inner fastening block and the outer fastening block and the circumferential connection surface between the outer fastening blocks, increasing the difficulty of water penetration between the two circumferential connection surfaces, thereby achieving a better waterproof and water-blocking effect; and the design that the corrugation amplitudes of the two circumferential connection surfaces are not greater than the width difference between the inner fastening groove and the outer fastening block can ensure the smoothness and convenience of the installation between the inner fastening groove and the outer fastening block and between the outer fastening groove and the inner fastening block. After the installation is completed, the compressive sheath layer has a good anti-loosening effect whether it contracts or expands.

[0012] As an improvement of the present invention, after the outer fastening block is engaged with the inner fastening groove, the end surface of the inner abutting block and the bottom surface of the outer fastener are on the same arc surface. Through this improvement, the outer roundness of the compressive sheath layer is ensured, thereby ensuring the roundness during the spiral winding of the armored layer and also avoiding the shrinkage of the armored layer at the inner abutting block during deep-sea use.

[0013] As an improvement of the present invention, when the compression-resistant sheath layer shrinks to the minimum, two adjacent inner fastening blocks are in a butting state, and the butting surfaces of the two butting inner fastening blocks are arranged along the radial direction of the body. Through this improvement, the force uniformity during the shrinkage of the compression-resistant sheath layer is ensured, and the final compressed shape is also a circle, making it not easy to deform due to uneven pressure in the high-pressure deep-sea area, thereby ensuring the use quality in the high-pressure deep-sea area.

[0014] As an improvement of the present invention, both the outer fastener and the inner fastener are strip-shaped, and the outer fastener and the inner fastener are formed on the outer layer of the core wire unit in a straight-dragging installation direction. Through this improvement, the installation of the compression-resistant sheath layer on the outer layer of the core wire unit is realized.

[0015] As an improvement of the present invention, the armor layer is formed by helically winding multiple layers of armor steel wires, and the helical winding directions of two adjacent layers of armor steel wires are opposite. Through this improvement, while ensuring the structural strength of the armor layer, the armor layer can also adapt to the ocean current change environment in the deep-sea environment. The design with opposite helical winding directions of two adjacent layers of armor steel wires makes one layer of the armor layer become loose under the influence of ocean currents, while the other layer becomes tighter under the influence of ocean currents. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the overall cross-sectional structure of the present invention.

[0017] Figure 2 is a schematic diagram of the enlarged structure of the sheath unit of the present invention in the normal state.

[0018] Figure 3 is a schematic diagram of the connection structure between the outer fastener and the inner fastener when the compression-resistant sheath layer is compressed and shrunk in the present invention.

[0019] Figure 4 is a schematic diagram of the connection structure between the outer fastener and the inner fastener when the compression-resistant sheath layer expands due to the water-blocking layer in the present invention.

[0020] As shown in the figure: 1. Core wire unit, 1.1. Core wire tape, 2. Sheath unit, 2.1. Armor layer, 2.1.1. Armor steel wire, 2.2. Compression-resistant sheath layer, 2.2.1. Outer fastener, 2.2.1.1. Outer fastening block, 2.2.1.2. Outer fastening groove, 2.2.2. Inner fastener, 2.2.2.1. Inner fastening block, 2.2.2.2. Inner abutting block, 2.2.2.3. Inner fastening groove, 2.3. Outer sheath, 3. Water-blocking layer. Detailed Embodiments

[0021] The embodiments of the present invention will be further described below with reference to the drawings.

[0022] Such as Figure 1-2As shown in the figure, a deep - water dynamic umbilical cable includes a body. The body includes a core wire unit 1 and a sheath unit 2. The sheath unit 2 is located on the outer layer of the core wire unit 1. The sheath unit 2 includes an armor layer 2.1. An anti - compression sheath layer 2.2 is provided inside the armor layer 2.1. The anti - compression sheath layer 2.2 is formed into a ring by buckling a plurality of inner fasteners 2.2.2 and a plurality of outer fasteners 2.2.1. The two ends of any one of the inner fasteners 2.2.2 are respectively buckled with two adjacent outer fasteners 2.2.1. The two ends of any one of the outer fasteners 2.2.1 are respectively buckled with two adjacent inner fasteners 2.2.2. The inner fastener 2.2.2 and the outer fastener 2.2.1 are connected by radial buckling.

[0023] Both the inner fastener 2.2.2 and the outer fastener 2.2.1 are made of cold - rolled steel.

[0024] Two outer buckling blocks 2.2.1.1 facing the inner fastener 2.2.2 are provided at both ends of the outer fastener 2.2.1. An outer buckling groove 2.2.1.2 facing the inner fastener 2.2.2 is formed between the two outer buckling blocks 2.2.1.1 on the same outer fastener 2.2.1. Two inner buckling blocks 2.2.2.1 facing the outer fastener 2.2.1 are provided at both ends of the inner fastener 2.2.2. The width of the outer buckling groove 2.2.1.2 is greater than the sum of the widths of the two inner buckling blocks 2.2.2.1 buckled into the outer buckling groove 2.2.1.2. A layer of core wire wrapping tape 1.1 is wound around the outer layer of the core wire unit 1. A water - blocking layer 3 is provided between the core wire wrapping tape 1.1 and the anti - compression sheath layer 2.2. The water - blocking layer 3 is composed of water - swellable rubber. In the normal state, there is a gap between the water - blocking layer 3 and the anti - compression sheath layer 2.2. An inner abutting block 2.2.2.2 facing the outer fastener 2.2.1 is provided at the center of the inner fastener 2.2.2. An inner buckling groove 2.2.2.3 is provided between the inner abutting block 2.2.2.2 and the two inner buckling blocks 2.2.2.1 at both ends. The two inner buckling grooves 2.2.2.3 are respectively buckled with the outer buckling blocks 2.2.1.1 on two adjacent outer fasteners 2.2.1. The width of the inner buckling groove 2.2.2.3 is greater than the width of the outer buckling block 2.2.1.1.

[0025] The core wire unit 1 includes an electrical signal core wire, an optical signal core wire, an oil - gas pipeline and a filling strip, and then is bundled into a cylindrical strip by the core wire wrapping tape 1.1.

[0026] As Figure 2-4As shown, the circumferential connecting surface between the inner snap block 2.2.2.1 and the outer snap block 2.2.1.1 is in a matching corrugated shape, and the circumferential connecting surface between the inner abutting block 2.2.2.2 and the outer snap block 2.2.1.1 is also in a matching corrugated shape. Moreover, the corrugation amplitude of the circumferential connecting surface between the inner snap block 2.2.2.1 and the outer snap block 2.2.1.1 and the corrugation amplitude of the circumferential connecting surface between the inner abutting block 2.2.2.2 and the outer snap block 2.2.1.1 are both not greater than the width difference between the inner snap groove 2.2.2.3 and the outer snap block 2.2.1.1. After the outer snap block 2.2.1.1 is snapped into the inner snap groove 2.2.2.3, the end face of the inner abutting block 2.2.2.2 and the bottom surface of the outer fastener 2.2.1 are on the same arc surface. When the compressive sheath layer 2.2 shrinks to the minimum, two adjacent inner snap blocks 2.2.2.1 are in a state of abutment, and the abutting surfaces of the two abutting inner snap blocks 2.2.2.1 are arranged along the radial direction of the body.

[0027] Both the outer fastener 2.2.1 and the inner fastener 2.2.2 are strip-shaped, and the outer fastener 2.2.1 and the inner fastener 2.2.2 are formed on the outer layer of the core wire unit 1 in a straight-dragging installation direction.

[0028] As Figure 3 shown, when winding the armored steel wire or when the body is just put into the deep-sea area and there is no water seepage and the water-blocking layer 3 has not expanded, the compressive sheath layer 2.2 is in a compressed state under pressure. Two adjacent inner fasteners 2.2.2 are arranged in an abutting state, and the outer sides of the outer snap blocks 2.2.1.1 at both ends of the outer fastener 2.2.1 are respectively abutted against two adjacent inner abutting blocks 2.2.2.2 and are tightly fixed along the corrugated circumferential connecting surface, ensuring the structural stability of the compressive sheath layer 2.2.

[0029] As Figure 4As shown, when water seeps into the main body and the water-blocking layer 3 absorbs water and expands, the compressive sheath layer 2.2 is affected by the expansion of the water-blocking layer 3 and exceeds the armored layer 2.1 and the deep-sea pressure, also in an expanded state. Two adjacent inner fasteners 2.2.2 move away from each other, and the inner sides of the outer fastener blocks 2.2.1.1 at both ends of the outer fastener 2.2.1 respectively abut against two adjacent inner fastener blocks 2.2.2.1, and are tightly fixed along the circumferential joint surface in a corrugated state, switching the circumferential joint surface for water blocking of the compressive sheath layer 2.2 and ensuring the structural stability of the compressive sheath layer 2.2. At the same time, the expansion process of the compressive sheath layer 2.2 is a slow process. If there is a violent deep-sea current activity during the expansion process, the switching movement process between the two circumferential joint surfaces may also deviate. At this time, as long as the armored layer 2.1 does not completely disperse, it will still present a restraining state on the compressive sheath layer 2.2. Then, during the subsequent expansion process, the inner side of the outer fastener block 2.2.1.1 and the inner side of the inner fastener block 2.2.2.1 will correct the expansion movement along the fitting angle of the circumferential joint surface. Finally, the compressive sheath layer 2.2 will still show a standard expanded state.

[0030] Therefore, under compression or in the expanded state, the structural stability of the compressive sheath layer 2.2 can be ensured. And the circumferential joint surface between the inner fastener block 2.2.2.1 and the outer fastener block 2.2.1.1 and the circumferential joint surface between the outer fastener blocks 2.2.1.1 are designed in a corrugated shape, which can also extend the length of the two circumferential joint surfaces, increasing the difficulty of water penetration between the two circumferential joint surfaces, thereby achieving a better waterproof and water-blocking effect.

[0031] The armored layer 2.1 is formed by helically winding multiple layers of armored steel wires 2.1.1, and the helical winding directions of two adjacent layers of armored steel wires 2.1.1 are opposite. An outer sheath layer 2.3 is provided outside the armored layer 2.1. The material of the outer sheath layer 2.3 is anti-corrosion rubber, which is suitable for deep-sea areas and prevents the armored layer 2.1 from becoming loose.

[0032] Through the design of the compressive sheath layer 2.2, it originally has good roundness under both compression and expansion conditions and does not need to be formed with the core wire unit 1 as the axis. Therefore, the requirement for the structural strength of the core wire unit 1 is low. Thus, the main forming area affected by the roundness of the core wire unit 1 is the water-blocking layer 3, and the core wire unit 1 only needs to ensure the structural strength and roundness of the formed water-blocking layer 3.

[0033] The above is only an illustration of the best embodiment of the present invention, but it should not be construed as a limitation of the claims. The present invention is not limited to the above embodiments, and its specific structure allows changes. All changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims

1. A deepwater dynamic umbilical cable, comprising a body, characterized in that: The body comprises a core wire unit (1) and a sheath unit (2), wherein the sheath unit (2) comprises an outer layer of the core wire unit (1), and the sheath unit (2) comprises an armor layer (2.1), wherein a pressure-resistant sheath layer (2.2) is provided on the inner side of the armor layer (2.1), wherein the pressure-resistant sheath layer (2.2) is formed into a ring shape by buckling a plurality of inner fasteners (2.2.2) and a plurality of outer fasteners (2.2.1), wherein the two ends of any one of the inner fasteners (2.2.2) are respectively buckled with two adjacent outer fasteners (2.2.1), and the two ends of any one of the outer fasteners (2.2.1) are respectively buckled with two adjacent inner fasteners (2.2.2), and the inner fasteners (2.2.2) and the outer fasteners (2.2.1) are connected by radial buckling.

2. A deepwater dynamic umbilical cable according to claim 1, characterized in that: Two outer buckle blocks (2.2.1.1) facing the inner buckle block (2.2.2) are provided at both ends of the outer buckle member (2.2.1); an outer buckle groove (2.2.1.2) facing the inner buckle member (2.2.2) is formed between the two outer buckle blocks (2.2.1.1) on the same outer buckle member (2.2.1); two inner buckle blocks (2.2.2.1) facing the outer buckle member (2.2.1) are provided at both ends of the inner buckle member (2.2.2); the width of the outer buckle groove (2.2.1.2) is greater than the sum of the widths of the two inner buckle blocks (2.2.2.1) buckled into the outer buckle groove (2.2.1.2).

3. A deepwater dynamic umbilical cable according to claim 2, characterized in that: The outer layer of the core wire unit (1) is wrapped with a core wire tape (1.1), a water-blocking layer (3) is provided between the core wire tape (1.1) and the pressure-resistant sheath layer (2.2), the water-blocking layer (3) is composed of water-absorbing and swelling rubber, and under normal conditions, a gap is provided between the water-blocking layer (3) and the pressure-resistant sheath layer (2.2).

4. A deepwater dynamic umbilical cable according to claim 2, characterized in that: An inner abutment block (2.2.2.2) facing the outer fastener (2.2.1) is provided at the center of the inner fastener (2.2.2), and an inner buckle groove (2.2.2.3) is provided between the inner abutment block (2.2.2.2) and the inner buckle blocks (2.2.2.1) at both ends, and the two inner buckle grooves (2.2.2.3) are respectively buckled with the outer buckle blocks (2.2.1.1) on the two adjacent outer fasteners (2.2.1).

5. A deepwater dynamic umbilical cable according to claim 4, characterized in that: The width of the inner buckle groove (2.2.2.3) is greater than the width of the outer buckle block (2.2.1.1).

6. A deepwater dynamic umbilical cable according to claim 5, characterized in that: The circumferential connection surface between the inner buckle block (2.2.2.1) and the outer buckle block (2.2.1.1) is in a matching corrugated shape, and the circumferential connection surface between the inner abutment block (2.2.2.2) and the outer buckle block (2.2.1.1) is also in a matching corrugated shape, and the corrugation amplitude of the circumferential connection surface between the inner buckle block (2.2.2.1) and the outer buckle block (2.2.1.1) and the corrugation amplitude of the circumferential connection surface between the inner buckle block (2.2.2.2) and the outer buckle block (2.2.1.1) are not greater than the width difference between the inner buckle groove (2.2.2.3) and the outer buckle block (2.2.1.1).

7. A deepwater dynamic umbilical cable according to claim 4, characterized in that: After the outer buckle block (2.2.1.1) is buckled with the inner buckle groove (2.2.2.3), the end surface of the inner abutment block (2.2.2.2) and the bottom surface of the outer buckle (2.2.1) are located on the same arc surface.

8. The deepwater dynamic umbilical cable according to claim 2, characterized in that: When the pressure-resistant jacket layer (2.2) shrinks to the minimum, two adjacent inner buckle blocks (2.2.2.1) are in an abutting state, and the abutting surfaces of the two abutting inner buckle blocks (2.2.2.1) are arranged along the radial direction of the body.

9. A deepwater dynamic umbilical cable according to claim 8, characterized in that: The outer fastener (2.2.1) and the inner fastener (2.2.2) are both in the shape of strips, and the outer fastener (2.2.1) and the inner fastener (2.2.2) are formed on the outer layer of the core wire unit (1) in a straight-drag installation direction.

10. A deepwater dynamic umbilical cable according to claim 9, characterized in that: The armor layer (2.1) is formed by spirally wrapping multiple layers of armor steel wires (2.1.1), and the spiral wrapping directions of two adjacent layers of armor steel wires (2.1.1) are opposite.

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