Non-metallic marine coiled tubing carcass layer structure and method of manufacture thereof

Abstract

The application provides a non-metal marine coiled tubing skeleton layer structure and a manufacturing method thereof, which solves the technical problems of high cost, large weight or poor bending resistance of the existing skeleton layer, and comprises a first non-metal skeleton layer spirally wound, and a second non-metal skeleton layer circumferentially or crossly wound on the first non-metal skeleton layer. A plurality of reinforcing ropes are arranged between the first non-metal skeleton layer and the second non-metal skeleton layer in parallel and along the axial direction of the pipeline. The first non-metal skeleton layer is fixedly connected or integrally formed with the reinforcing ropes and the second non-metal skeleton layer. The application forms a simple limiting bending structure by combining the two non-metal skeleton layers and the reinforcing ropes, and not only has a large-angle bending resistance close to that of an armored skeleton, but also optimizes the weight of the structure layer. In combination with the process, the application is simple, economical and can be widely applied to the technical field of fluid conveying.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fluid delivery technology, in particular to a non-metallic marine coiled tubing skeleton layer structure and a manufacturing method thereof. BACKGROUND

[0002] In the process of product manufacturing and transportation, the continuous oil pipeline is generally stored or transported in the form of large disc winding due to its long length. In order to ensure the safety of the pipeline, a minimum bending radius value is designed to ensure that the performance of the pipe material is normal under the condition that the value is not less than the minimum bending radius value.

[0003] Due to the fact that the design standard of deep-sea pipeline is much higher than that of land pipeline, and the environment of submarine pipeline is more complex than that of land pipeline, not only the buoyancy of the pipeline and the external pressure of deep-sea water need to be considered, but also the dynamic influence of ocean current, wave and tide on the pipeline needs to be considered. Further, due to the fact that the direction and size of ocean current and wave are uncertain, the pipe material is often arched into C or S shape under the action of surge and water flow impact force, which has a relatively serious influence on the pipeline. An important point is that the impact force of wave on the pipe material is uncontrollable, which leads to the uncontrollability of the bending radius of the pipe. When the force is too large, the bending radius of the pipe may be less than the allowable minimum bending radius, which may cause irreversible damage to the pipe material, and even lead to the scrap of the pipe material.

[0004] In view of the above situation, the traditional marine pipe skeleton layer is mostly made of metal armor and is continuously wound to limit the bending of the pipe material. When the radius of the pipe material is less than the allowable value, the buckle structure of the armor layer is self-locked, so that the pipe material cannot be bent any more, thereby protecting the pipe material. The disadvantage of this structure is that it is made of metal, which increases the weight of the pipe material and has a relatively complex structure and high process cost.

[0005] In recent years, some composite non-metal deep-sea oil pipelines have gradually appeared in the market. Among them, a relatively popular skeleton layer structure is to use a spiral winding resin material reinforcing structure, or to fill resin later to form a spiral reinforcing structure. For example, a composite coiled tubing and manufacturing method in Chinese patent CN115059411A includes a coiled tubing body and an inner liner. A cable is wound on the outer side wall of the inner liner, and the cable is supported between the coiled tubing body and the inner liner, and a filling gap is formed between the coiled tubing body and the inner liner, and a filling material is condensed in the filling gap. Another example is a coiled tubing for downhole use in Chinese patent CN106014289A, which adopts a steel belt armored skeleton combined with a wound fiber structure. Although the above technical solutions solve the problem of small bending angle to some extent, the simple winding reinforcing structure cannot obviously limit the bending protection except for the application of a metal armored skeleton. Another skeleton structure adopts the way of increasing the braided layer or cross winding (combination of positive and reverse rotation directions), such as a continuous fiber reinforced thermoplastic plastic pipe in Chinese patent CN208519338U and a smart flexible composite coiled tubing for downhole use and its manufacturing process in Chinese patent CN107355187A. Essentially, both increase the cross winding structure to improve the bending resistance of the pipeline, but this faces a dilemma. If the pipe material is designed to be soft, it will still appear in the case of large angle bending; if the pipe material is designed to be hard, although it can avoid large angle bending under stress, it increases the difficulty of winding on the reel, which is not convenient for manufacturing, winding and transportation, and also significantly increases the manufacturing cost.

[0006] In summary, the skeleton layer structure of the oil pipeline needs to be further improved. SUMMARY

[0007] The present application is to solve the problems in the above background art, and provides a non-metallic marine coiled tubing skeleton layer structure with simple structure, low cost and limiting bending structure, and a manufacturing method thereof.

[0008] Therefore, the present application provides a non-metallic marine coiled tubing skeleton layer structure, which comprises a first non-metallic skeleton layer wound spirally; a second non-metallic skeleton layer is wound around or cross-wound on the first non-metallic skeleton layer;

[0009] A plurality of reinforcing ropes are arranged between the first non-metallic skeleton layer and the second non-metallic skeleton layer; the reinforcing ropes are arranged along the axial direction of the pipeline, and the first non-metallic skeleton layer is fixedly connected or integrally formed with the reinforcing ropes and the second non-metallic skeleton layer.

[0010] Preferably, the base material of the first non-metallic skeleton layer and the second non-metallic skeleton layer is resin fiber.

[0011] Preferably, the first non-metallic skeleton layer is a single-layer single-strand or multi-strand winding structure, and the reinforcing ropes are lapped on the cylindrical surface of the first non-metallic skeleton layer.

[0012] Preferably, the length of the reinforcing ropes between each pitch is greater than the winding pitch of the skeleton layer.

[0013] Preferably, the second non-metallic skeleton layer is a single-layer single-strand or multi-strand winding structure, and is co-directionally wound on the first non-metallic skeleton layer; the single-strand structure pitch of the second non-metallic skeleton layer is equal to the single-strand structure pitch of the first non-metallic skeleton layer.

[0014] Preferably, the width of the single-strand structure of the second non-metallic skeleton layer in the axial direction of the pipeline is less than the pitch.

[0015] Preferably, the skeleton layer is located between the hoop reinforcing layer and the liner pipe; the first non-metallic skeleton layer is located on the outer surface of the hoop reinforcing layer, and the liner pipe is located on the outer surface of the second non-metallic skeleton layer.

[0016] Preferably, the reinforcing ropes are distributed in an equidistant manner along the circumferential direction of the pipeline, or in a densely packed manner within a group and an equidistant manner between groups.

[0017] In another aspect, the present application also provides a non-metallic marine coiled tubing skeleton layer manufacturing method, and the processing steps include:

[0018] S1, the base material of the first non-metallic skeleton is wound on the outer surface of the hoop reinforcing layer by coating, spraying or stretching;

[0019] S2, a plurality of reinforcing ropes are laid along the axial direction of the pipeline to the outer surface of the first non-metallic skeleton completed in S1;

[0020] S3, the base material of the second non-metallic skeleton is wound on the outer side of the first non-metallic skeleton layer and the reinforcing ropes by coating, spraying or stretching;

[0021] S4, the first non-metallic skeleton layer, the reinforcing ropes and the second non-metallic skeleton layer are fixedly connected by mechanical connection, glueing, melting solidification or heating solidification.

[0022] Preferably, the base material of the first non-metallic skeleton layer and the second non-metallic skeleton layer is a resin fiber; the reinforcing ropes are aramid ropes or fiber ropes; in S4, the first non-metallic skeleton layer, the reinforcing ropes and the second non-metallic skeleton layer are fixed by heating solidification to form an integrated structure.

[0023] The present application provides a non-metallic marine coiled tubing skeleton layer structure and a manufacturing method thereof, which has the following beneficial effects:

[0024] The present application combines the longitudinal laid reinforcing rope with two layers of non-metallic skeleton, when the pipe is not subjected to bending, the fiber rope is in a relaxed state, when the pipe is subjected to external force to produce bending, the fiber rope is in a tension state, which limits the bending amount of the pipe; the relaxation amount of the fiber rope determines the bending radius of the pipe, so that it becomes a new type of skeleton layer structure, which not only has a bending resistance close to the armored skeleton, but also optimizes the weight of the structure layer, and combines the process to make it simple and economical. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The figure shows the installation position of the specific embodiment of the present application layer by layer;

[0026] Figure 2 The figure shows the installation position of the specific embodiment of the present application longitudinal section structure;

[0027] Figure 3 The figure shows the installation position of the specific embodiment of the present application longitudinal section structure;

[0028] Figure 4 The figure shows the installation position of the specific embodiment of the present application parameter annotation;

[0029] Figure 5 The figure shows the installation position of the specific embodiment of the present application reinforcing rope circumferential distribution;

[0030] The figure shows the installation position of the specific embodiment of the present application reinforcing rope circumferential distribution; DETAILED DESCRIPTION

[0031] The present application will be further described below in conjunction with the drawings and specific embodiments, to help understand the content of the present application. The methods used in the present application are conventional methods unless otherwise specified; the raw materials and devices used are conventional commercially available products unless otherwise specified.

[0032] The present application provides a non-metallic marine coiled tubing skeleton layer structure, as shown in Figure 1 、 2 , taking a common marine coiled tubing as an example, the pipe layers are respectively an inner lining layer 1, a hoop reinforcing layer 2, a liner 4 and an outer pipe, wherein the skeleton layer 3 in the present embodiment is specifically located between the hoop reinforcing layer 2 and the liner 4.

[0033] In combination with Figure 1 、 3As shown, the skeleton layer 3 primarily comprises a first non-metallic skeleton layer 301 and a second non-metallic skeleton layer 302 helically wound around the outer surface of the circumferential reinforcement layer 2. Preferably, the base materials of the first non-metallic skeleton layer 301 and the second non-metallic skeleton layer 302 are both resin fibers. Furthermore, a plurality of reinforcing cords 303 are laid parallel between the first non-metallic skeleton layer 301 and the second non-metallic skeleton layer 302, and the reinforcing cords 303 are arranged along the axial direction of the pipe. In this embodiment, the first non-metallic skeleton layer 301, the reinforcing cords 303, and the second non-metallic skeleton layer 302 are integrally formed to increase the connection strength of the connecting end.

[0034] Preferably, the first non-metallic skeleton layer 301 is a single-layer, wound structure. In this embodiment, a single-strand structure is used as an example for description. Multiple reinforcement cords 303 are axially overlapped on the cylindrical surface formed by the first non-metallic skeleton layer 301. The second non-metallic skeleton layer 302 is also a single-layer, wound structure, also used as an example for description. It is wound around the first non-metallic skeleton layer 301 in the same direction. Specifically, the pitch of the single-strand structure of the second non-metallic skeleton layer 302 is equal to the pitch of the single-strand structure of the first non-metallic skeleton layer 301. As shown in the figure, it can be seen from the cross-sectional view that in this embodiment, the single-strand structure of the second non-metallic skeleton layer 302 is kept centered compared to the single-strand structure of the first non-metallic skeleton layer 301, and the width of the single-strand structure of each part of the second non-metallic skeleton layer 302 along the axial direction of the pipe is smaller than the winding pitch of the two metal skeleton layers, and a spacing is maintained between the adjacent end faces shown in the cross-sectional view, so that part of the reinforcement rope 303 is exposed; further, the length of the reinforcement rope 303 between each spiral of the second non-metallic skeleton layer 302 is kept greater than the pitch, and the excess length is the design reserved bending limit length, combined with Figure 4 As shown, the simplified description is that the rope length L of the reinforcement rope 303 in the exposed area is greater than the distance D between the two end faces. This design ensures that when the pipeline is in a straight state, the reinforcement rope 303 exposed in the empty area of ​​each section is in a relaxed state, retaining a certain stretch margin. Furthermore, in order to ensure that the empty area has sufficient rope length during the integrated processing, different technical solutions can be adopted. For example, in this embodiment, a wavy or toothed tooling can be used to press down on the cylindrical surface of the first non-metallic skeleton layer 301 to artificially ensure the rope length L at the interval. At the same time, a small amount of sinking area will be generated on the cylindrical surface (the groove below the rope between the two convex parts in the figure) to ensure that the rope length L is greater than the distance D. Similarly, a half-height boss can be added during the winding stage of the first non-metallic skeleton layer 301, or a second coating can be applied to form a half-height boss. Then, the reinforcement rope 303 can be laid and pressed down in the axial direction to ensure the rope length L. The structural form in actual processing is not specifically limited in this embodiment.

[0035] Preferably, the reinforcement ropes 303 are distributed equidistantly along the circumference of the pipeline, as shown in FIG. Figure 5a; or in the form of a group arrangement as required, such as Figure 5 b, a plurality of groups, equidistant or equiangular distribution between groups; or as required, such as Figure 5 c, equidistant or equiangular distribution between groups, but the number of reinforcing ropes 303 in the group is different, considering the internal flow of space for placing cables and other lines.

[0036] It should be noted that Figure 5 The number of reinforcing ropes 303 or the interval angle shown in the figure is only for convenient explanation, and cannot be understood as a specific restriction condition in the embodiment.

[0037] On the other hand, the specific embodiment of the present application also provides a non-metallic marine coiled tubing skeleton layer manufacturing method, based on the above embodiment, the processing steps mainly include:

[0038] S1, the resin fiber base material of the first non-metallic skeleton 301 is wound on the outer surface of the hoop reinforcing layer 2 by coating;

[0039] S2, a plurality of aramid ropes (reinforcing ropes 303) are laid on the cylindrical surface of the first non-metallic skeleton 301 completed in S1 along the axial direction of the pipeline;

[0040] S3, the resin fiber base material of the second non-metallic skeleton 302 is wound on the outer side of the first non-metallic skeleton layer 301 and the aramid rope along the same path in S1 by coating, and the coating width is kept smaller than that in S1 during the process, leaving a spacing D;

[0041] S4, the resin fiber of the first non-metallic skeleton layer 301, the aramid rope and the resin fiber of the second non-metallic skeleton layer 302 are formed into an integral structure by warm curing.

[0042] The design of the embodiment can make the skeleton layer 3 have good bending ability. Within the designed bending angle range, no additional bending force is generated, making it easy to wind. Once the bending part reaches the designed angle, the spacing D on the outside of the bending part will increase, causing the reinforcing ropes 303 to straighten, resulting in a limiting effect, equivalent to a split armored structure, which can prevent the pipeline from further bending and avoid large-angle bending, protecting the pipe and prolonging its service life.

[0043] In the description of the present application, it should be understood that the terms "left", "right", "up", "down", "top", "bottom", "front", "back", "inside", "outside", "back", "middle" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation of the present application.

[0044] While the application has been described by way of example, it should be appreciated that certain aspects of the application have been disclosed only and other aspects have been omitted. The application is not limited to the aspects disclosed but rather the scope of the application is, as those skilled in the art will readily appreciate upon reading the foregoing description, predetermined by the claims that follow.

Claims

1. A non-metallic marine coiled tubing carcass layer structure, characterized by, The first non-metallic skeleton layer is spirally wound, and a second non-metallic skeleton layer is wound around or cross-wound on the first non-metallic skeleton layer; A plurality of reinforcing ropes are arranged between the first non-metallic skeleton layer and the second non-metallic skeleton layer in parallel, the reinforcing ropes are arranged along the axial direction of the pipeline, and the first non-metallic skeleton layer is fixedly connected or integrally formed with the reinforcing ropes and the second non-metallic skeleton layer; The width of the single-strand structure of the second non-metallic skeleton layer in the axial direction of the pipeline is less than the winding pitch of the two non-metallic skeleton layers, so that a spacing is left between the end faces of two adjacent second non-metallic skeleton layers, the width of the spacing is D, the rope length of the reinforcing ropes between the spacing is L, and L is greater than D.

2. A non-metallic coiled tubing carcass layer structure according to claim 1, wherein, The base materials of the first non-metallic skeleton layer and the second non-metallic skeleton layer are resin fibers.

3. A non-metallic coiled tubing skeleton layer structure according to claim 1 or 2, characterized in that, The first non-metallic skeleton layer is a single-layer winding structure, and the reinforcing ropes are overlapped on the cylindrical surface of the first non-metallic skeleton layer.

4. A non-metallic coiled tubing carcass layer structure according to claim 3, wherein, The length of the reinforcing ropes between each pitch is greater than the winding pitch of the first non-metallic skeleton layer.

5. A non-metallic coiled tubing carcass layer structure according to claim 4, wherein, The second non-metallic skeleton layer is a single-layer winding structure and is wound on the first non-metallic skeleton layer in the same direction; the pitch of the single-strand structure of the second non-metallic skeleton layer is equal to the pitch of the single-strand structure of the first non-metallic skeleton layer.

6. A non-metallic coiled tubing carcass layer structure according to claim 5, wherein, The width of the single-strand structure of the second non-metallic skeleton layer in the axial direction of the pipeline is less than the pitch.

7. A non-metallic coiled tubing skeleton layer structure according to claim 1, characterized in that, The skeleton layer is located between the hoop reinforcing layer and the liner pipe; the first non-metallic skeleton layer is located on the outer surface of the hoop reinforcing layer, and the liner pipe is located on the outer surface of the second non-metallic skeleton layer.

8. A non-metallic coiled tubing skeleton layer structure according to claim 1, characterized in that, The reinforcing ropes are distributed equidistantly along the circumferential direction of the pipeline, or densely in groups and equidistantly between groups.

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