Ocean flexible vertical pipe framework layer connecting structure and connecting method thereof

Abstract

The invention discloses a marine flexible vertical pipe framework layer connecting structure which comprises a first framework layer, a second framework layer and a connecting piece, the first framework layer and the second framework layer are formed by spirally winding and interlocking S-shaped lock catches, and spiral grooves matched with the ends of the first framework layer and the second framework layer are formed in the two ends of the connecting piece. One end of the first framework layer and one end of the second framework layer are spirally inserted into the spiral grooves in the two ends of the connecting piece. Through the structural design of the framework layers of the S-shaped lock catch structures and the connecting piece, the two framework layers can be rotated and screwed to the two ends of the connecting piece at the same time through reverse spirals, the bending performance of the pipeline cannot be affected by the connected framework layers, the connecting operation is simple, and operation can be conducted on the seabed.

Description

Technical Field

[0001] This invention relates to a connection structure and connection method thereof, particularly a marine flexible riser skeleton layer connection structure and connection method thereof, belonging to the field of marine flexible pipelines. Background Technology

[0002] Marine flexible risers are pipelines used in offshore oil and gas development. They are characterized by flexibility, bendability, and resistance to crushing. Their crushing and bending resistance is primarily achieved through an interlocking skeleton layer within the pipeline. However, due to the large-angle helical winding, the skeleton layer typically requires welding during production. Welding not only reduces production efficiency but also introduces hidden fatigue damage points. During bending, the welded areas bear significant static and dynamic loads. Furthermore, in the event of pipeline failure and disconnection, the interlocking structure of the skeleton layer makes reconnection extremely difficult. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a connection structure and connection method for the marine flexible riser skeleton layer, thereby solving the connection problem of the marine flexible riser skeleton layer.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A marine flexible riser skeleton layer connection structure includes a first skeleton layer, a second skeleton layer, and a connector. The first skeleton layer and the second skeleton layer are formed by S-shaped locking spiral winding interlocking. The two ends of the connector are provided with spiral grooves that match the ends of the first skeleton layer and the second skeleton layer. One end of the first skeleton layer and the second skeleton layer are spirally inserted into the spiral grooves at both ends of the connector.

[0005] Furthermore, the first skeleton layer and the second skeleton layer are composed of a spirally wound strip structure. The cross-section of the strip structure is an S-shaped locking structure. When the strip structure is spirally wound, the two ends of the S-shaped locking structure of the adjacent spiral strip structure are interlocked with each other.

[0006] Furthermore, one end of the S-shaped latch protrudes outward from the skeleton layer. When the S-shaped latch is spirally wound and interlocked, the protrusion at one end of the S-shaped latch abuts against the inner wall of the other end of the previous spiral S-shaped latch.

[0007] Furthermore, the connector includes a locking portion, a first winding portion and a second winding portion, the first winding portion and the second winding portion being fixed at both ends of the locking portion respectively, and the first winding portion and the second winding portion being provided with spiral grooves respectively.

[0008] Furthermore, the spiral groove is a spiral channel that spirals along the circumferential direction of the first winding portion and the second winding portion, and the width of the spiral groove gradually decreases from the end away from the locking portion to the end closer to the locking portion.

[0009] Furthermore, the ends of the first and second winding portions away from the locking portion have an outwardly folded C-shaped structure, and the C-shaped structure engages with the S-shaped latches of the first and second skeleton layers.

[0010] Furthermore, the width of the spiral groove at the end away from the locking portion matches the winding pitch width of the first and second skeleton layers, and the width of the spiral groove at the end near the locking portion matches the width of the straight section at the end of the S-shaped latch of the first and second skeleton layers.

[0011] Furthermore, the spiral grooves of the first winding portion and the second winding portion have opposite spiral directions.

[0012] Furthermore, the end of the spiral groove of the first winding portion away from the locking portion and the end of the spiral groove of the second winding portion away from the locking portion have a misalignment angle of 30-90°.

[0013] A connection method for a marine flexible riser skeleton layer connection structure includes the following steps: S1. Place the first skeleton layer and the second skeleton layer on the semi-circular docking platform respectively, and the spiral directions of the first skeleton layer and the second skeleton layer are opposite. S2. Adjust the misalignment angle of the ends of the first and second skeleton layers that need to be connected to not exceed 90°. S3. Perform assembly pre-processing on the end of the first skeleton layer and the second skeleton layer that need to be connected. S4. Place the connector in the middle of the docking platform and position it between the first skeleton layer and the second skeleton layer, and make the misalignment angle of the first winding part and the second winding part of the connector match the misalignment angle of the first skeleton layer and the second skeleton layer. S5. Pull the ends of the first and second skeleton layers that need to be joined closer to the connector. S6. When the end of the winding part at one end of the connector is aligned with the end of a skeleton layer, rotate the connector to make the end of the skeleton layer rotate and insert into the spiral groove at one end of the connector. At this time, adjust the position of the other skeleton layer end to align with the end of the winding part at the other end of the connector. Continue to rotate the connector to make the other skeleton layer end rotate and insert into the spiral groove at the other end of the connector. S7. When the first skeleton layer and the second skeleton layer are both inserted into the spiral grooves at both ends of the connector, continue to rotate the connector until the distance between the ends of the first skeleton layer and the second skeleton layer and the end faces of the locking part matches the gap of the winding pitch of the skeleton layer.

[0014] Compared with the prior art, the present invention has the following advantages and effects: The present invention provides a marine flexible riser skeleton layer connection structure and connection method. Through the design of the skeleton layer and the connector structure with S-shaped locking structure, the two skeleton layers can be simultaneously rotated and tightened to both ends of the connector by reverse spiral. The connected skeleton layers will not affect the bending performance of the pipe, and the connection operation is simple and can be carried out on the seabed. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a marine flexible riser skeleton layer connection structure according to the present invention.

[0016] Figure 2 This is a cross-sectional view of a marine flexible riser skeleton layer connection structure according to the present invention.

[0017] Figure 3 This is a partially enlarged view of a marine flexible riser skeleton layer connection structure according to the present invention.

[0018] Figure 4 This is a schematic diagram of the connector of the present invention. Detailed Implementation

[0019] To illustrate in detail the technical solutions adopted by the present invention to achieve the intended technical objectives, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Furthermore, the technical means or technical features in the embodiments of the present invention can be replaced without creative effort. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0020] like Figure 1 and Figure 2 As shown, a marine flexible riser skeleton layer connection structure of the present invention includes a first skeleton layer 1, a second skeleton layer 2 and a connector 3. The first skeleton layer 1 and the second skeleton layer 2 are formed by S-shaped locking spiral winding interlocking. The two ends of the connector 3 are provided with spiral grooves that match the ends of the first skeleton layer 1 and the second skeleton layer 2. One end of the first skeleton layer 1 and the second skeleton layer 2 is spirally inserted into the spiral grooves at both ends of the connector 3.

[0021] like Figure 3As shown, the first skeleton layer 1 and the second skeleton layer 2 are composed of a spirally wound strip structure. The cross-section of the strip structure is an S-shaped locking structure. When the strip structure is spirally wound, the two ends of the S-shaped locking 4 of the adjacent spiral strip structure are interlocked. In this embodiment, the S-shaped locking is generally flat and S-shaped. The upper and lower parts of the S-shaped locking are straight. In this way, the groove width formed at the end of the S-shaped structure is slightly larger than the material thickness of the S-shaped locking. The S-shaped locking of two adjacent spirals can lock each other tightly while ensuring a certain degree of freedom and not affecting the bending performance of the pipe.

[0022] One end of the S-shaped latch 4 protrudes outward from the skeleton layer. When the S-shaped latch 4 is spirally wound and interlocked, the protrusion at one end of the S-shaped latch 4 abuts against the inner wall of the other end of the previous spiral S-shaped latch 4. Since the groove width of the S-shaped latch is slightly larger than the material thickness of the S-shaped latch, a protruding structure is used to form an elastic clamping structure to ensure the stability of the interlocking of two adjacent spiral S-shaped latches.

[0023] like Figure 4 As shown, the connector 3 includes a locking part 5, a first winding part 6 and a second winding part 7. The first winding part 6 and the second winding part 7 are respectively fixed to both ends of the locking part 5. The first winding part 6 and the second winding part 7 are respectively provided with spiral grooves 8.

[0024] The spiral groove 8 is a spiral channel that spirals along the circumferential direction of the first winding portion 6 and the second winding portion 7, and the width of the spiral groove 8 gradually decreases from the end away from the locking portion 5 to the end closer to the locking portion 5.

[0025] The ends of the first winding portion 6 and the second winding portion 7 away from the locking portion 5 have outwardly folded C-shaped structures, and the C-shaped structures engage with the S-shaped latches 4 of the first skeleton layer 1 and the second skeleton layer 2. Thus, when the first skeleton layer 1 and the second skeleton layer 2 are screwed into the spiral groove 8, the S-shaped latches 4 and the C-shaped structures interlock to form an interlocking structure.

[0026] The width of the spiral groove 8 at the end away from the locking part 5 matches the winding pitch width of the first skeleton layer 1 and the second skeleton layer 2, and the width of the spiral groove 8 at the end near the locking part 5 matches the width of the straight section at the end of the S-shaped latch 4 of the first skeleton layer 1 and the second skeleton layer 2.

[0027] The spiral grooves 8 of the first winding portion 6 and the second winding portion 7 have opposite spiral directions. Through the opposite spiral design, simultaneous connection with the two skeleton layers can be achieved simply by rotating the connector 3.

[0028] The end of the spiral groove 8 of the first winding part 6 away from the locking part 5 and the end of the spiral groove 8 of the second winding part 7 away from the locking part 5 have a misalignment angle of 30-90°. Through the misalignment angle design, the connector 3 can complete the alignment and screwing operation on one side first during the rotation connection process, and then complete the alignment and screwing operation on the other side, making the operation simpler and more convenient.

[0029] A connection method for a marine flexible riser skeleton layer connection structure includes the following steps: S1. Place the first skeleton layer and the second skeleton layer on the semi-circular docking platform respectively, and the spiral directions of the first skeleton layer and the second skeleton layer are opposite. S2. Adjust the misalignment angle of the ends of the first and second skeleton layers that need to be connected to not exceed 90°. S3. Perform assembly pre-processing on the ends of the first and second skeleton layers that need to be joined, specifically including cutting, grinding, and chamfering; S4. Place the connector in the middle of the docking platform and position it between the first skeleton layer and the second skeleton layer, and make the misalignment angle of the first winding part and the second winding part of the connector match the misalignment angle of the first skeleton layer and the second skeleton layer. S5. Pull the ends of the first and second skeleton layers that need to be joined closer to the connector. S6. When the end of the winding part at one end of the connector is aligned with the end of a skeleton layer, rotate the connector to make the end of the skeleton layer rotate and insert into the spiral groove at one end of the connector. At this time, adjust the position of the other skeleton layer end to align with the end of the winding part at the other end of the connector. Continue to rotate the connector to make the other skeleton layer end rotate and insert into the spiral groove at the other end of the connector. S7. When the first skeleton layer and the second skeleton layer are both inserted into the spiral grooves at both ends of the connector, continue to rotate the connector until the distance between the ends of the first skeleton layer and the second skeleton layer and the end faces of the locking part matches the gap of the winding pitch of the skeleton layer.

[0030] This invention provides a connection structure and method for a marine flexible riser skeleton layer. Through the design of the skeleton layer and the connector structure with an S-shaped locking structure, the two skeleton layers can be simultaneously tightened to both ends of the connector by rotating in opposite directions. The connected skeleton layers do not affect the bending performance of the pipeline, and the connection operation is simple, allowing for operation on the seabed.

[0031] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present invention, based on the technical essence of the present invention and within the spirit and principles of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A marine flexible riser carcass layer connection structure, characterized by: It includes a first skeleton layer, a second skeleton layer and a connector. The first skeleton layer and the second skeleton layer are interlocked by an S-shaped locking spiral winding. The two ends of the connector are provided with spiral grooves that match the ends of the first skeleton layer and the second skeleton layer. One end of the first skeleton layer and the second skeleton layer are spirally inserted into the spiral grooves at both ends of the connector.

2. A flexible marine riser carcass joint according to claim 1, characterised in that: The first and second skeleton layers are made of spirally wound strip structures. The cross-section of the strip structure is an S-shaped interlocking structure. When the strip structure is spirally wound, the two ends of the S-shaped interlocking of the adjacent spiral strip structures are interlocked with each other.

3. A flexible marine riser carcass joint according to claim 2, characterised in that: One end of the S-shaped latch protrudes outward from the skeleton layer. When the S-shaped latch is spirally wound and interlocked, the protrusion at one end of the S-shaped latch abuts against the inner wall of the other end of the previous spiral S-shaped latch.

4. A flexible marine riser carcass joint according to claim 1, characterised in that: The connector includes a locking part, a first winding part and a second winding part. The first winding part and the second winding part are respectively fixed to both ends of the locking part, and the first winding part and the second winding part are respectively provided with spiral grooves.

5. The marine flexible riser skeleton layer connection structure according to claim 4, characterized in that: The spiral groove is a spiral channel that spirals along the circumference of the first winding portion and the second winding portion, and the width of the spiral groove gradually decreases from the end away from the locking portion to the end closer to the locking portion.

6. The marine flexible riser skeleton layer connection structure according to claim 4, characterized in that: The first winding portion and the second winding portion have an outwardly flipped C-shaped structure at the end away from the locking portion, and the C-shaped structure engages with the S-shaped latches of the first skeleton layer and the second skeleton layer.

7. The marine flexible riser skeleton layer connection structure according to claim 5, characterized in that: The width of the spiral groove at the end away from the locking part matches the winding pitch width of the first and second skeleton layers, and the width of the spiral groove at the end near the locking part matches the width of the straight section of the end of the S-shaped latch of the first and second skeleton layers.

8. The marine flexible riser skeleton layer connection structure according to claim 4, characterized in that: The spiral directions of the spiral grooves in the first and second winding portions are opposite.

9. The marine flexible riser skeleton layer connection structure according to claim 8, characterized in that: The end of the spiral groove of the first winding part away from the locking part and the end of the spiral groove of the second winding part away from the locking part have a misalignment angle of 30-90°.

10. A connection method for the marine flexible riser skeleton layer connection structure according to any one of claims 1-9, characterized in that... Includes the following steps: S1. Place the first skeleton layer and the second skeleton layer on the semi-circular docking platform respectively, and the spiral directions of the first skeleton layer and the second skeleton layer are opposite. S2. Adjust the misalignment angle of the ends of the first and second skeleton layers that need to be connected to not exceed 90°. S3. Perform assembly pre-processing on the end of the first skeleton layer and the second skeleton layer that need to be connected. S4. Place the connector in the middle of the docking platform and position it between the first skeleton layer and the second skeleton layer, and make the misalignment angle of the first winding part and the second winding part of the connector match the misalignment angle of the first skeleton layer and the second skeleton layer. S5. Pull the ends of the first and second skeleton layers that need to be joined closer to the connector. S6. When the end of the winding part at one end of the connector is aligned with the end of a skeleton layer, rotate the connector to make the end of the skeleton layer rotate and insert into the spiral groove at one end of the connector. At this time, adjust the position of the other skeleton layer end to align with the end of the winding part at the other end of the connector. Continue to rotate the connector to make the other skeleton layer end rotate and insert into the spiral groove at the other end of the connector. S7. When the first skeleton layer and the second skeleton layer are both inserted into the spiral grooves at both ends of the connector, continue to rotate the connector until the distance between the ends of the first skeleton layer and the second skeleton layer and the end faces of the locking part matches the gap of the winding pitch of the skeleton layer.

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