CN218063719U - Marine corrosion-resistant flexible pipe - Google Patents

Abstract

The utility model relates to an ocean oil gas conveying equipment technical field specifically is a corrosion-resistant flexible pipe is used to ocean, include from interior to fluid shielding layer, casing ply, resistance to compression armor, first wearing layer, tensile armor, second wearing layer and the outer protective layer that sets gradually outward, the casing ply is made by the steel cord winding that the parcel has barrier material. According to the flexible pipe, the blocking material is wrapped outside the steel cord to prepare the framework layer, so that the corrosion resistance of the framework layer is effectively improved, and the problem that the external pressure load bearing caused by corrosion of the framework layer of the traditional flexible pipe is reduced is solved. Meanwhile, the steel cord has a strong anti-twisting function, and can replace an anti-twisting layer in the traditional tube body while bearing external pressure load, so that the total thickness of the tube body is effectively reduced.

Description

Corrosion-resistant flexible pipe for marine use

technical field

The utility model relates to the technical field of marine oil and gas transportation equipment, in particular to a corrosion-resistant flexible pipe for marine use.

Background technique

The ocean is rich in oil and gas resources. In the development of offshore oil and gas fields, submarine pipelines are a key component of the ocean infrastructure. With the development of the oil and gas industry, marine flexible pipes are more and more widely used in the development of offshore oil and gas fields. Composite hoses can be used as static pipelines or dynamic pipelines, and are widely used in production, injection, export and service pipelines.

The flexible pipes for offshore oil and gas fields outlined in the recommended practice DNVGL RP F119 are mainly used for flexible oil flow pipelines and flexible jumper pipes, which can carry large dynamic loads during operations or in offshore environments. A typical flexible pipe section for offshore oil and gas fields usually includes a skeleton layer, an inner fluid shielding layer, a compressive armor layer, a wear layer, a tensile armor layer, a wear layer, a tensile armor layer, an anti-local twist layer and an outer The fluid shielding layer has a total of 9 layers of structure. For example, Chinese patent document CN 208735050 U (application number 201821471300.8) discloses a composite flexible pipe whose pipe wall includes a skeleton layer, an inner lining layer, a compressive armor layer, The middle protective sheath layer, the cable hole layer, the first tensile armor layer, the second tensile armor layer and the outer protective sheath layer, the inner lining layer and the outer protective sheath layer respectively prevent the corrosion of the pipe body by the transport fluid and the marine environment , but the frame layer in the flexible pipe is located inside the inner lining layer and directly contacts with the transport fluid, so the service life of the frame layer cannot be guaranteed. The grinding layer is used for protection, which not only increases the thickness of the pipe wall, but also makes the preparation process cumbersome.

Utility model content

The purpose of this utility model is to overcome the deficiencies of the above-mentioned prior art and provide a corrosion-resistant flexible pipe for marine use. The skeleton layer in the pipe body is made of steel cords wrapped with barrier materials, which can effectively improve the corrosion resistance of the skeleton layer. , while integrating the setting position of the armor layer, reducing the total number of layers of the wear-resistant layer and the armor layer, reducing the wall thickness and simplifying the preparation process.

In order to achieve the above object, the utility model adopts the following technical solutions:

A corrosion-resistant flexible pipe for marine use, including a fluid shielding layer, a skeleton layer, a compressive armor layer, a first wear-resistant layer, a tensile armor layer, a second wear-resistant layer and an outer protection layer arranged sequentially from the inside to the outside layer, the skeleton layer is made of steel cord wrapped with barrier material.

The flexible pipe provided by this application prepares the skeleton layer by wrapping the barrier material on the outside of the steel cord, which effectively improves the corrosion resistance of the skeleton layer and solves the problem of the reduction of the external pressure load caused by the corrosion of the skeleton layer of the traditional flexible pipe. . At the same time, the steel cord has a strong anti-twist function. While bearing external pressure loads, it replaces the anti-twist layer inside the traditional pipe body, effectively reducing the total thickness of the pipe body.

Preferably, the barrier material is made of resin or other materials with strong barrier properties.

Preferably, the tensile armor layer is made of even-numbered layers of steel materials cross-wound.

Preferably, the first wear-resistant layer and/or the second wear-resistant layer are made of self-healing materials. The wear-resistant layer is made of self-healing material. When the pipe body is affected by ocean currents and creeps in the ocean, after the tensile armor layer wears on the wear-resistant layer, the self-healing material can self-heal after wear, effectively isolating the pipe body The tensile armor layer prolongs the service life of the pipe body and reduces the cost of use.

Preferably, the outer protective layer is made of thermoplastic.

Further preferably, the outer protective layer is made of one of polyethylene (PE), polypropylene (PP), heat-resistant polyethylene (PERT), POK, PVDF, nylon (PA) or other materials with the same function become.

The beneficial effects of the utility model are:

1. The flexible pipe wraps the barrier material outside the steel cord to prepare the skeleton layer, which effectively improves the corrosion resistance of the skeleton layer and solves the problem of the reduction of the external pressure load caused by the corrosion of the skeleton layer of the traditional flexible pipe. At the same time, the steel cord has a strong anti-twist function. While bearing external pressure loads, it replaces the anti-twist layer inside the traditional pipe body, effectively reducing the total thickness of the pipe body;

2. Use the self-healing material to make the wear-resistant layer. When the pipe body is affected by ocean currents and wriggles in the ocean, after the tensile armor layer wears the wear-resistant layer, the self-healing material can self-heal after wear and effectively isolate The tensile armor layer inside the pipe prolongs the service life of the pipe and reduces the cost of use.

Description of drawings

Fig. 1 is the structural representation of the marine corrosion-resistant flexible pipe that embodiment 1 provides;

Among them, 1. Fluid shielding layer; 2. Skeleton layer; 3. Compressive armor layer; 4. The first wear-resistant layer; 5. Tensile armor layer; 6. The second wear-resistant layer; 7. Outer protective layer .

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Example 1:

A corrosion-resistant flexible pipe for marine use, comprising a fluid shielding layer 1, a skeleton layer 2, a compression-resistant armor layer 3, a first wear-resistant layer 4, a tensile armor layer 5, a second resistant The grinding layer 6 and the outer protective layer 7, during the preparation process, the fluid shielding layer 1 and the skeleton layer 2 are made into an integrated structure, so as to have better gas barrier performance, avoid gas accumulation in the annulus and cause pipeline collapse, and also reduce the The hot and humid environment formed by the annulus corrodes the metal functional layer, which reduces the risk of hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC) in the high-strength armor bond of the metal functional layer, and achieves the purpose of long-term service of the flexible pipe. The skeleton layer 2 is made by winding steel cords wrapped with barrier material. The barrier material is selected from resin or other materials with strong barrier properties. In this embodiment, the resin is selected from the resin material provided in Chinese patent document CN108503738A (application number 201810338996.5). The tensile armor layer 5 is made of even-numbered layers of steel materials cross-wound. In this embodiment, the tensile armor layer 5 is made of 4 layers of steel materials cross-wound. The first wear-resistant layer 4 is made of a self-healing material. In this embodiment, the self-healing material is selected from the materials provided in paragraph [0015] of the Chinese patent document CN 206338503 U (application number 201621471645.4). Other existing commercially available self-healing materials can be used. The wear-resistant layer is made of self-healing material. When the pipe body is affected by ocean currents and wriggles in the ocean, the tensile armor layer 5 wears out the wear-resistant layer, and the self-healing material can heal itself after wear, effectively isolating the pipe The internal tensile armor layer 5 prolongs the service life of the pipe body and reduces the cost of use. The outer protective layer 7 is made of thermoplastics, specifically, the outer protective layer 7 is made of polyethylene (PE), polypropylene (PP), heat-resistant polyethylene (PERT), POK, PVDF, nylon (PA) or one of the other materials with the same function. In this embodiment, the outer protective layer 7 is made of nylon.

The flexible pipe wraps the barrier material on the outside of the steel cord to prepare the skeleton layer, which effectively improves the corrosion resistance of the skeleton layer and solves the problem of the reduction of the external pressure load caused by the corrosion of the skeleton layer of the traditional flexible pipe. At the same time, the steel cord has a strong anti-twist function. While bearing external pressure loads, it replaces the anti-twist layer inside the traditional pipe body, effectively reducing the total thickness of the pipe body.

Example 2:

A corrosion-resistant flexible pipe for marine use. The difference between this embodiment and Embodiment 1 is that the second wear-resistant layer 6 is made of a self-healing material, and other technical details are the same.

Example 3:

A corrosion-resistant flexible pipe for marine use. The difference between this embodiment and Embodiment 1 is that the first wear-resistant layer 4 and the second wear-resistant layer 6 are both made of self-healing materials, and other technical details are the same .

Claims (6)

1. The marine corrosion-resistant flexible pipe is characterized by comprising a fluid shielding layer (1), a framework layer (2), a pressure-resistant armor layer (3), a first wear-resistant layer (4), a tensile armor layer (5), a second wear-resistant layer (6) and an outer protective layer (7) which are sequentially arranged from inside to outside, wherein the framework layer (2) is formed by winding steel cords wrapped with barrier materials.

2. The corrosion resistant flexible pipe for marine use of claim 1 wherein said barrier material is made of resin.

3. Marine corrosion resistant flexible pipe according to claim 1, characterised in that said tensile armour layer (5) is made of an even number of layers of steel cross wound.

4. Marine corrosion resistant flexible pipe according to claim 1, characterised in that the first wear layer (4) and/or the second wear layer (6) are made of a self-healing material.

5. Marine corrosion-resistant flexible pipe according to claim 1, characterised in that the outer protective layer (7) is made of thermoplastic.

6. Marine corrosion resistant flexible pipe according to claim 5, characterised in that the outer protective layer (7) is made of one of Polyethylene (PE), polypropylene (PP), heat resistant Polyethylene (PERT), POK, PVDF or nylon (PA).

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