CN116293109A

CN116293109A - High-strength tensile flexible composite pipeline

Info

Publication number: CN116293109A
Application number: CN202310232107.8A
Authority: CN
Inventors: 夏平原; 许晓红; 陈东阳; 蒋铭
Original assignee: Jiangsu Zhengdao Combustible Ice Pipeline Co ltd
Current assignee: Jiangsu Zhengdao Combustible Ice Pipeline Co ltd
Priority date: 2023-03-10
Filing date: 2023-03-10
Publication date: 2023-06-23

Abstract

The application relates to a high-strength tensile flexible composite pipeline, which comprises an inner liner layer, an outer framework layer, a first wear-resistant layer, a reinforcing layer, a first isolation layer, an inner cladding layer, a tensile layer and an outer protection layer which are sequentially arranged from inside to outside; the inner liner layer, the inner cladding layer and the outer protective layer all comprise polymer layers; the outer framework layer comprises at least two steel curtain belt layers, and the number of the steel curtain belt layers is even; the reinforcing layer comprises four steel belt layers or round steel special-shaped steel layers; the tensile layer comprises a first tensile flat steel layer, a second wear-resistant layer, a second tensile flat steel layer and a second isolation layer which are sequentially arranged from inside to outside. The first wear-resistant layer comprises at least two nylon cloth layers or one nylon cloth layer which is spirally overlapped into more than two layers; the second wear-resistant layer comprises at least two nylon cloth layers or one nylon cloth layer which is spirally overlapped into more than two layers; the first isolation layer and the second isolation layer comprise polyester film layers; the composite pipeline prepared by the method has higher strength performance.

Description

High-strength tensile flexible composite pipeline

Technical Field

The application relates to the technical field of flexible composite pipelines, in particular to a high-strength tensile flexible composite pipeline.

Background

The flexible composite pipeline is an important pipeline tool in petroleum and natural gas exploitation, is widely applied to petroleum and natural gas exploitation in the land ocean field, has been developed into various structures such as metal wire reinforcement, metal belt reinforcement, nonmetal wire reinforcement, nonmetal belt reinforcement, special-shaped material reinforcement and the like along with development for many years, and can be divided into ocean pipes and land pipes according to different use environments; the structure may be further classified into an adhesive type and a non-adhesive type, etc. The novel anti-corrosion waterproof plastic is light in material, corrosion-resistant, convenient to connect and easy to bend, and has excellent convenience in the use process.

The composite pipeline is accompanied with the conditions of dragging or swaying during land and ocean operation, and is in a high-pressure environment for a long time, so that the strength of the composite pipeline is easily reduced, and the phenomenon of pipe explosion failure of the composite pipeline is caused, so that the composite pipeline needs to be improved.

Disclosure of Invention

In order to increase the strength of the composite pipe, the present application provides a high strength tensile flexible composite pipe.

On one hand, the application provides a high strength tensile flexible composite pipe, adopts following technical scheme:

a high-strength tensile flexible composite pipeline comprises an inner liner layer, an outer framework layer, a first wear-resistant layer, a reinforcing layer, a first isolation layer, an inner coating layer, a tensile layer and an outer protection layer which are sequentially arranged from inside to outside;

the inner liner layer, the inner cladding layer and the outer protective layer all comprise polymer layers;

the outer framework layer comprises at least two steel curtain belt layers, and the number of layers of the steel curtain belt layers is even;

the reinforcing layer comprises four steel belt layers or round steel special-shaped steel layers;

the tensile layer comprises a first tensile flat steel layer, a second wear-resistant layer, a second tensile flat steel layer and a second isolation layer which are sequentially arranged from inside to outside;

the first wear-resistant layer comprises at least two nylon cloth layers or one nylon cloth layer which is spirally overlapped into more than two layers;

the second wear-resistant layer comprises at least two nylon cloth layers or one nylon cloth layer which is spirally overlapped into more than two layers;

the first isolation layer and the second isolation layer both comprise polyester film layers.

The composite pipeline produced according to the layer structure has higher strength and good actual use effect, and the specific scheme is analyzed as follows:

the outer skeleton layer is combined with the inner liner layer, so that the outer skeleton layer is used as a skeleton material layer of the composite pipeline, and when the composite pipeline conveys fluid, the outer skeleton layer is used as a main carrier for bearing pressure inside the composite pipeline, and the deformation resistance of the composite pipeline is improved.

Secondly, nylon has good comprehensive properties including mechanical properties, heat resistance, abrasion resistance, chemical resistance and self-lubricity; and the friction coefficient of nylon is lower for nylon has certain fire resistance, therefore, adopts the first wearing layer of nylon cloth layer preparation as the protective layer of outer skeleton layer, can resist the enhancement layer when connecting in outer skeleton layer outside, the shearing effort that produces to outer skeleton layer, thereby has further improved composite pipe's anti deformability. The polyester film has good air tightness, heat resistance, cold resistance, chemical resistance and oil resistance, and has excellent toughness, tensile strength and impact strength in thermoplastic plastics, so that when the first isolation layer and the second isolation layer prepared by the polyester film are used as the layer structure of the composite pipeline, the strength and toughness of the composite pipeline can be improved.

In addition, the enhancement layer is located the outside of outer skeleton layer to the outside of enhancement layer has set gradually interior coating, tensile layer and protective layer again, and a plurality of layer structures finally form integrated structure under the effect of outer protective layer, thereby have positive effect to the improvement of composite pipe intensity. The inner coating layer and the outer protection layer are both polymer layers, so that the influence of external force on the composite pipeline in the transportation, installation and use processes is reduced. Therefore, the composite pipeline after the multilayer molding has better strength and toughness, and the defect that the composite pipeline is in tube explosion failure due to dragging or swaying under the condition of high pressure can be effectively overcome.

Preferably, the material of the polymer layer is selected from one or more of polyethylene, crosslinked polyethylene, nylon, polyvinylidene fluoride and polyphenylene sulfide.

By adopting the technical scheme, the polyethylene, the crosslinked polyethylene, the nylon, the polyvinylidene fluoride and the polyphenylene sulfide have the characteristics of no odor and no toxicity, have excellent low temperature resistance and chemical stability, and can resist most of acid and alkali corrosion.

In addition, polyethylene, crosslinked polyethylene, nylon, polyvinylidene fluoride and polyphenylene sulfide are easy to process and form, so that the composite pipeline has higher production efficiency in the preparation process.

Preferably, the first and second tensile flat steel layers are both made of high-strength flat steel.

By adopting the technical scheme, the high-strength flat steel has higher strength, can not only bear the actions of tension, torsion, friction and the like, but also be used as a high-strength weight layer of the composite pipeline, thereby effectively improving the strength of the composite pipeline.

Preferably, the steel cord layer is obtained by coating a steel cord belt with a resin.

Through adopting above-mentioned technical scheme, the perisporium of resin to steel cord area is cladding, has effectively improved the cohesion between steel cord area and polymer and the nylon respectively to the stability of combining between outer skeleton layer and inner liner and the first wearing layer respectively has been improved.

Preferably, the resin is selected from high performance thermoplastic resins including polyethylene.

Preferably, the steel strip layer is made of galvanized steel strip, and the round steel special-shaped steel layer is made of galvanized round steel special-shaped steel.

By adopting the technical scheme, the galvanized steel strip and the galvanized round steel special-shaped steel have good corrosion resistance, so that when the galvanized steel strip or the galvanized round steel special-shaped steel is used as the reinforcing layer in the composite pipeline, the strength of the composite pipeline can be improved, and the corrosion resistance of the composite pipeline can be improved.

On the other hand, the preparation method of the high-strength tensile flexible composite pipeline provided by the application adopts the following technical scheme:

a preparation method of a high-strength tensile flexible composite pipeline comprises the following steps:

s1, preparation of an inner liner: heating and melting lining layer material particles, and cooling and shaping through a die to form a lining layer;

s2, preparing an outer framework layer: heating two layers of steel curtain belt layers, and spirally winding the two layers of steel curtain belt layers on the outer side of the inner lining layer in a forward and reverse direction in a crossing manner to form an outer framework layer;

s3, preparing a first wear-resistant layer: spirally winding the two nylon cloth layers on the outer side of the outer framework layer in a forward and reverse direction in a crossing manner to form a first wear-resistant layer;

s4, preparation of an enhancement layer: spirally winding four galvanized steel strips on the outer side of the first wear-resistant layer from inside to outside in a forward and reverse direction in a crossed mode to form a reinforcing layer;

s5, preparing a first isolation layer: spirally winding a polyester film on the outer side of the reinforcing layer to form a first isolation layer;

s6, preparing an inner coating layer: coating the material particles of the inner coating layer on the outer side of the first isolation layer in an extrusion mode to form an inner coating layer;

s7, preparing a tensile layer: spirally winding the high-strength flat steel, the nylon cloth layer, the high-strength flat steel and the polyester film layer on the outer side of the inner coating layer in a forward and reverse direction in a crossed mode to form a tensile layer;

s8, preparing an outer protective layer: and coating the outer protective layer material particles on the outer side of the tensile layer in an extrusion mode to form the outer protective layer.

Through adopting above-mentioned technical scheme, the steel curtain band layer can take place to flow when the heating to warp, has effectively improved the bondability when steel curtain band layer twines in the inner liner. And the cooled steel curtain belt layer and the inner liner layer form an integrated structure, so that the deformation resistance of the composite pipeline is improved, and the service life of the composite pipeline is prolonged. The inner coating layer is coated on the outer layer of the isolation layer under the melting action, the outer protection layer is coated on the outer layer of the tensile layer under the melting action, and the inner coating layer and the outer protection layer are made of resin with wear resistance, scratch resistance and chronic cracking resistance, so that the composite pipeline has good strength and toughness.

In addition, the preparation method of the pipeline has the advantage of simplicity in operation, so that the composite pipeline prepared by the preparation method has the advantage of high production efficiency.

As preferable: the winding angles of the first wear-resistant layer, the reinforcing layer, the first isolation layer and the tensile layer form an included angle of 30-80 degrees with the axial direction of the pipeline.

By adopting the technical scheme, the winding angles of the first wear-resistant layer, the reinforcing layer, the first isolation layer and the tensile layer are controlled, so that the upper layer can be completely covered on the surface of the lower layer, high-strength matching between the layers is realized, and the strength and toughness of the composite pipeline are improved.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the reinforcing layer is positioned at the outer side of the outer framework layer, the inner coating layer, the tensile layer and the protective layer are sequentially arranged at the outer side of the reinforcing layer, and the plurality of layers of structures form an integrated structure under the action of the outer protective layer, so that the reinforcing layer has positive effect on the improvement of the strength of the composite pipeline; the composite pipeline after the multi-layer molding has better strength and toughness, and can effectively overcome the defect that the composite pipeline is in tube explosion failure due to dragging or swaying under the condition of high pressure.

2. The galvanized steel strip has better anti-corrosion performance, so that when the galvanized steel strip is used as a reinforcing layer in the composite pipeline, the strength of the composite pipeline can be improved, and the anti-corrosion performance of the composite pipeline can be improved.

Drawings

FIG. 1 is a schematic cross-sectional view of a high strength tensile flexible composite pipe according to an embodiment of the present application.

Fig. 2 is an enlarged view of a portion of the structure a of fig. 1.

Reference numerals illustrate:

1. an inner liner layer; 2. an outer carcass layer; 3. a first wear layer; 4. a reinforcing layer; 5. a first isolation layer; 6. an inner cladding layer; 7. a tensile layer; 71. a first tensile flat steel layer; 72. a second wear layer; 73. a second tensile flat steel layer; 74. a second isolation layer; 8. and an outer protective layer.

Detailed Description

The following is a further detailed description of the present application in conjunction with FIGS. 1-2, and examples and comparative examples, all of which are commercially available.

Examples

Example 1

Referring to fig. 1 and 2, a high-strength tensile flexible composite steel strip includes an inner liner 1, an outer skeleton layer 2, a first wear-resistant layer 3, a reinforcing layer 4, a first isolation layer 5, an inner coating layer 6, a tensile layer 7 and an outer protection layer 8 which are sequentially arranged from inside to outside, and the axial directions of the inner liner 1, the outer skeleton layer 2, the first wear-resistant layer 3, the reinforcing layer 4, the first isolation layer 5, the inner coating layer 6, the tensile layer 7 and the outer protection layer 8 are consistent.

Referring to fig. 1 and 2, the inner liner 1, the inner cladding 6, and the outer protection layer 8 each include a polymer layer, and the inner liner 1, the inner cladding 6, and the outer protection layer 8 are integrally tubular. The outer framework layer 2 comprises at least two steel curtain belt layers, and the number of the steel curtain belt layers is even; for example, the number of steel curtain belt layers can be two, four, six or the like, and the outer skeleton layer 2 in the embodiment of the present application comprises two steel curtain belt layers. The reinforcing layer 4 comprises four steel tape layers or round steel profiled steel layers, in this embodiment the reinforcing layer 4 comprises four steel tape layers. The tensile layer 7 comprises a first tensile flat steel layer 71, a second wear-resistant layer 72, a second tensile flat steel layer 73 and a second isolation layer 74 which are sequentially arranged from inside to outside. The first wear-resistant layer 3 includes at least two nylon cloth layers or one spiral stack more than two nylon cloth layers, in this embodiment, the first wear-resistant layer 3 includes two nylon cloth layers, the second wear-resistant layer 72 includes at least two nylon cloth layers or one spiral stack more than two nylon cloth layers, in this embodiment, the second wear-resistant layer 72 includes two nylon cloth layers, and the first isolation layer 5 and the second isolation layer 74 all include polyester film layers.

Referring to fig. 1 and 2, the material of the polymer layer is selected from polyethylene; the steel cord belt layer is obtained by coating a steel cord belt with resin, wherein the resin is selected from high-performance thermoplastic resin which is polyethylene; the steel belt layer is made of galvanized steel belts; the first tensile flat steel layer 71 and the second tensile flat steel layer 73 are both made of high-strength flat steel.

The parameters for the high strength tensile flexible composite pipe made in example 1 are shown in table 1:

sequence number	Functional layer	Thickness (mm)
			1	Inner liner layer	7.5
2	Outer skeleton layer	8.5
			3	First wear-resistant layer	7.5
4	Enhancement layer	14.5
			5	A first isolation layer	3.5
6	Inner cladding layer	3.5
			7	Tensile layer	15.5
8	Outer protective layer	3.5

The processing technology of the high-strength tensile flexible composite steel belt comprises the following steps:

s1, preparation of an inner liner 1:

adding the material particles of the inner liner 1 into a single screw extrusion hopper, extruding by a single screw extruder, wherein the heating area of the single screw extruder is divided into 6 sections, and the temperature of each heating area is respectively as follows: the first section heating temperature is 80 ℃, the second section heating temperature is 160 ℃, the third section heating temperature is 180 ℃, the fourth section heating temperature is 195 ℃, the fifth section heating temperature is 205 ℃, and the sixth section heating temperature is 220 ℃; after the material of the inner liner 1 is heated and melted, the material is cooled by a mold shaping water tank to form the inner liner 1;

s2, preparing an outer framework layer 2:

the steel cord belt is soaked by resin to prepare a steel cord belt layer, and the two steel cord belt layers are heated in a hot air heating mode, wherein the heating temperature is 300 ℃; then spirally winding two layers of steel curtain belt layers on the outer side of the inner lining layer 1 in a forward and reverse direction in a crossing manner, controlling the winding angle of the steel curtain belt layers to form an included angle of 30-80 degrees with the axial direction of the pipeline to form an outer framework layer 2, and forming an integrated structure by the steel curtain belt layers and the inner lining layer 1;

s3, preparing a first wear-resistant layer 3:

spirally winding two nylon cloth layers on the outer side of the outer framework layer 2 in a forward and reverse direction in a crossing manner, and controlling the winding angle of the nylon cloth layers to form an included angle of 30-80 degrees with the axial direction of the pipeline to form a first wear-resistant layer 3;

s4, preparation of a reinforcing layer 4: spirally winding four galvanized steel strips on the outer side of the first wear-resistant layer 3 from inside to outside in a forward and reverse direction in a crossing manner, and controlling the winding angle of the galvanized steel strips to form an included angle of 30-80 degrees with the axial direction of the pipeline to form a reinforcing layer 4;

s5, preparing a first isolation layer 5:

spirally winding a polyester film on the outer side of the reinforcing layer 4, and controlling the winding angle of the polyester film to form an included angle of 30-80 degrees with the axial direction of the pipeline to form a first isolation layer 5;

s6, preparing an inner coating layer 6:

coating the material particles of the inner coating layer 6 on the outer side of the first isolation layer 5 through an extruding machine to form the inner coating layer 6;

s7, preparation of a tensile layer 7:

spirally winding the high-strength flat steel, two nylon cloth layers, the high-strength flat steel and the polyester film layer on the outer side of the inner coating layer 6 in a forward and reverse direction in a crossed mode, and controlling the winding angle of the high-strength flat steel, the nylon cloth layers, the high-strength flat steel and the polyester film layer to form an included angle of 30-80 degrees with the axial direction of the pipeline to form a tensile layer 7;

s8, preparing an outer protective layer 8: and coating the material particles of the outer protective layer 8 on the outer side of the tensile layer 7 through an extruder to form the outer protective layer 8.

Example 2

This embodiment differs from embodiment 1 in that: the material of the polymer layer is selected from crosslinked polyethylene.

Example 3

This embodiment differs from embodiment 1 in that: the material of the polymer layer is selected from nylon.

Example 4

This embodiment differs from embodiment 1 in that: the material of the polymer layer is selected from polyvinylidene fluoride.

Example 5

This embodiment differs from embodiment 1 in that: the polymer layer is made of polyphenylene sulfide.

Example 6

This embodiment differs from embodiment 1 in that: the material of the polymer layer is selected from a mixture of polyethylene and polyvinylidene fluoride.

Example 7

This embodiment differs from embodiment 1 in that: the reinforcing layer 4 comprises four round steel special-shaped steel layers, and the round steel special-shaped steel layers are made of galvanized round steel special-shaped steel.

Performance detection test method

The nominal dimensions DN/ID150 of the composite pipe in examples 1-7 are examined below.

Ring stiffness: the composite pipes of examples 1-7 were tested with reference to the relevant test method in GB/T9647 determination of the ring stiffness of thermoplastic pipes and the test data are recorded in Table 2.

Burst strength: the composite pipes in examples 1 to 7 were tested with reference to the relevant test methods in GB/T6111-2003 "principle of pipe internal pressure resistance test and sample requirement", and the test data were recorded in Table 2.

TABLE 2

Sample of	Ring stiffness (KN/m 2)	Burst strength (KPa)
			Example 1	54	23.5
Example 2	53	22.5
			Example 3	55	24
Example 4	54	23.5
			Example 5	55	25.5
Example 6	53	23
			Example 7	55	25

Through the detection data of table 2 and the detection results of examples 1-7, the composite pipeline has relatively excellent mechanical properties, and can effectively reduce the condition that the composite pipeline is in failure due to pipe bursting caused by dragging or swaying under the high-pressure condition, namely, the strength of the composite pipeline is improved.

The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.

Claims

1. A high strength tensile flexible composite pipe, characterized in that: comprises an inner liner layer (1), an outer framework layer (2), a first wear-resistant layer (3), a reinforcing layer (4), a first isolation layer (5), an inner coating layer (6), a tensile layer (7) and an outer protection layer (8) which are sequentially arranged from inside to outside;

the inner liner layer (1), the inner cladding layer (6) and the outer protection layer (8) all comprise polymer layers;

the outer framework layer (2) comprises at least two steel curtain belt layers, and the number of layers of the steel curtain belt layers is even;

the reinforcing layer (4) comprises four steel belt layers or round steel special-shaped steel layers;

the tensile layer (7) comprises a first tensile flat steel layer (71), a second wear-resistant layer (72), a second tensile flat steel layer (73) and a second isolation layer (74) which are sequentially arranged from inside to outside;

the first wear-resistant layer (3) comprises at least two nylon cloth layers or more than two nylon cloth layers which are spirally overlapped;

the second wear-resistant layer (72) comprises at least two nylon cloth layers or one nylon cloth layer which is spirally overlapped into more than two layers;

the first barrier layer (5) and the second barrier layer (74) each comprise a polyester film layer.

2. A high strength, tensile flexible composite pipe as defined in claim 1, wherein: the material of the polymer layer is selected from one or more of polyethylene, crosslinked polyethylene, nylon, polyvinylidene fluoride and polyphenylene sulfide.

3. A high strength, tensile flexible composite pipe as defined in claim 1, wherein: the first tensile flat steel layer (71) and the second tensile flat steel layer (73) are made of high-strength flat steel.

4. A high strength, tensile flexible composite pipe as defined in claim 1, wherein: the steel cord belt layer is obtained by coating a steel cord belt with resin.

5. A high strength, tensile flexible composite pipe as defined in claim 4, wherein: the resin is selected from high performance thermoplastic resins including polyethylene.

6. A high strength, tensile flexible composite pipe as defined in claim 1, wherein: the steel belt layer is made of galvanized steel strips, and the round steel special-shaped steel layer is made of galvanized round steel special-shaped steel.

7. A method of making a high strength tensile flexible composite pipe according to any one of claims 1 to 6, comprising the steps of:

s1, preparing an inner liner (1): heating and melting material particles of the inner liner (1), and cooling and shaping through a die to form the inner liner (1);

s2, preparing an outer framework layer (2): heating two layers of steel curtain belt layers, and spirally winding the two layers of steel curtain belt layers on the outer side of the inner lining layer (1) in a forward and reverse direction in a crossing manner to form an outer framework layer (2);

s3, preparing a first wear-resistant layer (3): spirally winding two nylon cloth layers on the outer side of the outer framework layer (2) in a forward and reverse direction in a crossing manner to form a first wear-resistant layer (3);

s4, preparation of a reinforcing layer (4): spirally winding four galvanized steel strips on the outer side of the first wear-resistant layer (3) from inside to outside in a forward and reverse direction in a crossed mode to form a reinforcing layer (4);

s5, preparing a first isolation layer (5): spirally winding a polyester film on the outer side of the reinforcing layer (4) to form a first isolation layer (5);

s6, preparing an inner coating layer (6): coating the material particles of the inner coating layer (6) on the outer side of the first isolation layer (5) in an extrusion mode to form the inner coating layer (6);

s7, preparing a tensile layer (7): spirally winding the high-strength flat steel, the nylon cloth layer, the high-strength flat steel and the polyester film layer on the outer side of the inner coating layer (6) in a forward and reverse direction in a crossed mode to form a tensile layer (7);

s8, preparing an outer protective layer (8): and coating the material particles of the outer protective layer (8) on the outer side of the tensile layer (7) in an extrusion mode to form the outer protective layer (8).

8. The method for preparing the high-strength tensile flexible composite pipeline according to claim 7, wherein the method comprises the following steps: the winding angles of the first wear-resistant layer (3), the reinforcing layer (4), the first isolation layer (5) and the tensile layer (7) form an included angle of 30-80 degrees with the axial direction of the pipeline.