阅读说明：本技术 一种柔性高压管线及其制作工艺 (Flexible high-pressure pipeline and manufacturing process thereof ) 是由 赵坤芳 曹琛 丁智远 吴明泉 刘春梅 孙显洁 于 2020-05-26 设计创作，主要内容包括：本发明公开了一种柔性高压管线及其制作工艺,所述柔性高压管线包括内衬层、至少一层设于所述内衬层外表面上的增强层以及设于所述增强层外的保护层；所述内衬层、增强层和保护层之间紧密粘接。通过对内衬层改性,加入了mPE后,由于其丰富的支链结构而具优良的物理机械性能以及很好的成型加工性能,加入了EVOH后能够增强内衬层的耐腐蚀能力,缠绕层加强了其抗压能力,能够绕卷盘缠绕几百米甚至上千米,可以地面铺敷,更加便于施工。(The invention discloses a flexible high-pressure pipeline and a manufacturing process thereof, wherein the flexible high-pressure pipeline comprises an inner liner, at least one reinforcing layer arranged on the outer surface of the inner liner and a protective layer arranged outside the reinforcing layer; and the lining layer, the reinforcing layer and the protective layer are tightly bonded. Through modifying the lining layer, after having added the mPE, have good physical and mechanical properties and fine shaping processing performance owing to its abundant branched chain structure, can strengthen the corrosion resisting ability of inner liner layer after having added EVOH, its compressive capacity has been strengthened to the winding layer, can wind several hundred meters or even last kilometers around the reel, can ground laying apply, the construction of being convenient for more.)

1. A flexible high-pressure pipeline is characterized by comprising an inner liner, at least one reinforcing layer arranged on the outer surface of the inner liner, and a protective layer arranged outside the reinforcing layer; the inner liner is made of high-density polyethylene, mPE, EVOH, SEBS grafted maleic anhydride and a compatibilizer; and the lining layer, the reinforcing layer and the protective layer are tightly bonded.

2. The flexible high-pressure pipeline according to claim 1, wherein the raw materials for manufacturing the inner liner comprise the following raw materials in parts by weight: 70-90 parts of high-density polyethylene, 1-5 parts of mPE, 5-10 parts of EVOH, 1-5 parts of SEBS grafted maleic anhydride and 5-10 parts of compatibilizer.

3. The flexible high-pressure pipe according to claim 2, characterized in that the compatibilizer is a blend of maleic anhydride grafted polyolefin, NF528, and the mass ratio of maleic anhydride grafted polyolefin, NF528 is 1: 2.

4. The flexible high-pressure pipeline according to claim 2, wherein the feedstock further comprises 3-7 parts by weight of carbon fibers.

5. The flexible high-pressure pipeline according to claim 1, wherein the raw material of the reinforcement layer is one or a combination of two or more of polyester fiber, aramid fiber, glass fiber, carbon fiber and metal wire, and the raw material of the reinforcement layer is spirally wound or woven.

6. The flexible high-pressure line according to claim 1, wherein the protective layer is a high-density polyethylene resin or an ultra-high molecular weight polyethylene fiber resin; the melt mass flow rate of the high-density polyethylene resin at 190 ℃ and 5kg is more than or equal to 18g/10 min.

7. Process for manufacturing a flexible high-pressure line according to any one of claims 1 to 6, characterized in that it comprises the following steps:

(1) adding the raw materials of the inner liner into an extruder, setting operation parameters, and extruding the inner liner; and the inner lining layer is subjected to wall thickness fixing and sizing;

(2) cooling the lining layer, and then drawing the lining layer by using a tractor;

(3) feeding the lining layer into a circular weaving machine to weave a reinforcing layer on the outer surface of the lining layer, or winding the reinforcing layer on the outer surface of the lining layer along a certain direction by using a winding machine;

(4) and extruding the protective layer arranged outside the reinforcing layer through high-temperature melting.

8. The manufacturing process of claim 7, wherein the material of the reinforcement layer is one or a combination of more than two of polyester fiber, aramid fiber, glass fiber, carbon fiber or metal wire; stranding and twisting the braided material before braiding or winding; the winding stroke of the winding machine is 2.12-2.35 times of the outer diameter of the lining layer, and the winding tension is 6.1-6.6 kgf.

9. The manufacturing process of claim 7, wherein the inner liner layer is formed by high-temperature melt extrusion, the extrusion temperature comprises 9 temperature control regions, and the temperature of each temperature control region is respectively controlled as follows: a first area: 170 +/-3 ℃; and a second zone: 210 +/-3 ℃; and (3) three zones: 230 +/-3 ℃; and (4) four areas: 270 plus or minus 3 ℃; and a fifth zone: 290 +/-3 ℃; a sixth zone: 270 plus or minus 3 ℃; seven areas: 270 plus or minus 3 ℃; and eight regions: 250 plus or minus 3 ℃; nine areas: 220 +/-3 ℃; wherein, the first zone, the second zone and the third zone are feeding sections; the fourth zone, the fifth zone and the sixth zone are melting sections; the seven zone, the eight zone and the nine zone are mixing sections.

10. The manufacturing process according to claim 7, wherein the protective layer is formed by high-temperature melt extrusion, the extrusion temperature comprises 6 temperature control areas, and the temperature of each temperature control area is respectively controlled as follows: a first area: 160 +/-2 ℃; and a second zone: 170 +/-2 ℃; and (3) three zones: 190 plus or minus 2 ℃; and (4) four areas: 220 +/-2 ℃; and a fifth zone: 200 plus or minus 2 ℃; a sixth zone: 170 +/-2 ℃.

Technical Field

The invention relates to the technical field of energy transportation, in particular to a flexible high-pressure pipeline and a manufacturing process thereof.

Background

At present, oil and gas transmission pipelines are commonly provided with steel pipes, glass fiber reinforced plastic pipes and flexible pipelines. Steel pipes and glass reinforced plastic pipes are commonly used for conveying oil gas, but the steel pipes are heavy, the joints are easy to leak gas, the laying is inconvenient, and the corrosion resistance of the steel pipes is poor; although the glass fiber reinforced plastic pipe is improved in corrosion resistance, the glass fiber reinforced plastic pipe is often designed as a long straight pipe because of its poor impact resistance, and its application place is limited. The flexible pipeline is provided with a reinforcing medium which can surround the outer wall of the inner layer pipeline and contains glass fiber or steel wire between the inner layer plastic pipeline and the outer layer plastic pipeline, so that the flexible pipeline has flexibility and can reach certain strength. However, the medium transported by the oil and gas pipeline is complex, generally is a plurality of media with coexisting oil, gas, water and solid phase, and particularly CO in the transported oil and gas along with the deep exploitation of crude oil₂、H₂S and other acidic gases are high in content, thermoplastic plastics are fully contacted with various gases in a high-pressure environment, after long-term contact, gas components are adsorbed on the surface of the material in a large amount and then permeate into the thermoplastic plastics, the pressure of gas accumulated in the material and the operation pressure of a pipeline tend to be balanced, when a pipeline is suddenly reduced in pressure, the volume of the gas in the thermoplastic plastics expands instantly to cause 'bubbles', so that the pipeline is blocked in an oil and gas pipeline, and the development of oil and gas transmission is severely restricted.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the flexible high-pressure pipeline and the manufacturing process thereof, solves the problem that the flexible pipeline in the prior art is not corrosion-resistant by modifying the flexible pipeline, and has the characteristics of corrosion resistance and high pressure resistance.

One aspect of the invention provides a flexible high-pressure pipeline, which comprises a lining layer, at least one reinforcing layer arranged on the outer surface of the lining layer and a protective layer arranged outside the reinforcing layer; the inner liner is made of high-density polyethylene, mPE, EVOH, SEBS grafted maleic anhydride and a compatibilizer; and the lining layer, the reinforcing layer and the protective layer are tightly bonded.

In some embodiments of the present invention, the raw materials for making the inner liner layer include the following raw materials in parts by weight: 70-90 parts of high-density polyethylene, 1-5 parts of mPE, 5-10 parts of EVOH, 1-5 parts of SEBS grafted maleic anhydride and 5-10 parts of compatibilizer.

In some embodiments of the invention, the compatibilizer is a blend of maleic anhydride grafted polyolefin, NF528, and the maleic anhydride grafted polyolefin, NF528, is in a mass ratio of 1: 2.

In some embodiments of the invention, the feedstock further comprises 3 to 7 parts by weight of carbon fibers.

In some embodiments of the present invention, the raw material of the reinforcement layer is one or a combination of two or more of polyester fiber, aramid fiber, glass fiber, carbon fiber, or metal wire, and the raw material of the reinforcement layer is spirally wound or woven.

In some embodiments of the invention, the protective layer is a high density polyethylene resin or an ultra high molecular weight polyethylene fiber resin. The melt mass flow rate of the high-density polyethylene resin at 190 ℃ and 5kg is more than or equal to 18g/10 min.

Another aspect of the present invention provides a manufacturing process of the above flexible high-pressure pipeline, including the following steps:

(1) adding the raw materials of the inner liner into an extruder, setting operation parameters, and extruding the inner liner; and the inner lining layer is subjected to wall thickness fixing and sizing;

(2) cooling the lining layer, and then drawing the lining layer by using a tractor;

(3) feeding the lining layer into a circular weaving machine to weave a reinforcing layer on the outer surface of the lining layer, or winding the reinforcing layer on the outer surface of the lining layer along a certain direction by using a winding machine;

(4) and extruding the protective layer arranged outside the reinforcing layer through high-temperature melting.

In some embodiments of the invention, the material of the reinforcement layer is one or a combination of two or more of polyester fibers, aramid fibers, glass fibers, carbon fibers or metal wires; stranding and twisting the braided material before braiding or winding; the winding stroke of the winding machine is 2.12-2.35 times of the outer diameter of the lining layer, and the winding tension is 6.1-6.6 kgf.

In some embodiments of the present invention, the inner liner layer is formed by high-temperature melt extrusion, the extrusion temperature comprises 9 temperature control regions, and the temperature of each temperature control region is controlled as follows: a first area: 170 +/-3 ℃; and a second zone: 210 +/-3 ℃; and (3) three zones: 230 +/-3 ℃; and (4) four areas: 270 plus or minus 3 ℃; and a fifth zone: 290 +/-3 ℃; a sixth zone: 270 plus or minus 3 ℃; seven areas: 270 plus or minus 3 ℃; and eight regions: 250 plus or minus 3 ℃; nine areas: 220 +/-3 ℃; wherein, the first zone, the second zone and the third zone are feeding sections; the fourth zone, the fifth zone and the sixth zone are melting sections; the seven zone, the eight zone and the nine zone are mixing sections.

In some embodiments of the present invention, the protective layer is formed by high-temperature melt extrusion, the extrusion temperature includes 6 temperature control zones, and the temperature of each temperature control zone is controlled at: a first area: 160 +/-2 ℃; and a second zone: 170 +/-2 ℃; and (3) three zones: 190 plus or minus 2 ℃; and (4) four areas: 220 +/-2 ℃; and a fifth zone: 200 plus or minus 2 ℃; a sixth zone: 170 +/-2 ℃.

The invention has the beneficial effects that:

the flexible pipeline comprises a lining layer, at least one reinforcing layer arranged on the outer surface of the lining layer and a protective layer arranged outside the reinforcing layer; the lining layer, the reinforcing layer and the protective layer are tightly bonded. Through modifying the lining layer, after having added the mPE, have good physical and mechanical properties and fine shaping processing performance owing to its abundant branched chain structure, can strengthen the corrosion resisting ability of inner liner layer after having added EVOH, its compressive capacity has been strengthened to the winding layer, can wind several hundred meters or even last kilometers around the reel, can ground laying apply, the construction of being convenient for more.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a schematic structural view of a flexible high-pressure line according to an embodiment of the present invention.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.

The experimental procedures in the following examples are conventional unless otherwise specified. The test materials used in the following examples were purchased from a conventional biochemical reagent store unless otherwise specified. In the quantitative tests in the following examples, three replicates were set, and the data are the mean or the mean ± standard deviation of the three replicates.

The invention provides a flexible high-pressure pipeline, which comprises an inner liner layer 1, at least one reinforcing layer 2 arranged on the outer surface of the inner liner layer and a protective layer 3 arranged outside the reinforcing layer, wherein the inner liner layer, the reinforcing layer and the protective layer are tightly bonded.

The manufacturing process of the flexible pipeline comprises the following steps:

(1) adding the raw materials of the inner liner into an extruder, setting operation parameters, and extruding the inner liner; and the inner lining layer is subjected to wall thickness fixing and sizing;

(2) cooling the lining layer, and then drawing the lining layer by using a tractor;

(3) feeding the lining layer into a circular weaving machine to weave a reinforcing layer on the outer surface of the lining layer, or winding the reinforcing layer on the outer surface of the lining layer along a certain direction by using a winding machine;

(4) and extruding the protective layer arranged outside the reinforcing layer through high-temperature melting.

Specifically, the material of the reinforcement layer is one or a combination of two or more of polyester fiber, aramid fiber, glass fiber, carbon fiber and metal wire. The thickness of the reinforcing layer is designed according to the pressure requirement, the number of winding layers is set according to the thickness of the reinforcing layer, and the winding angles between adjacent layers are +55 degrees and-55 degrees respectively.

The braided material is twisted, specifically 5-8 strands.

The winding stroke of the winding machine is 2.12-2.35 times of the outer diameter of the lining layer, and the winding tension is 6.1-6.6 kgf. The material may also be twisted, specifically 5-20 strands, prior to winding.

Specifically, the raw materials of the inner liner layer mainly comprise high-density polyethylene, mPE, EVOH and a compatibilizer. The melt mass flow rate of the high-density polyethylene at 190 ℃ and 5kg is more than or equal to 18g/10min, and can be P6006N, and the compatibilizer can be a blend of maleic anhydride grafted polyolefin and NF528, wherein the mass ratio of the maleic anhydride grafted polyolefin to the NF528 is 1: 2. The mPE can be selected from Eltex series.

One or more of an antioxidant and an ultraviolet resistant additive can be added into the protective layer to protect the pipeline and prevent the pipeline from aging due to long-term open-air environment.

The flexible high-pressure pipeline has the pipe diameter of 2-6 inches, the design pressure of 8000psi, low temperature resistance of-40 ℃ and high temperature resistance of 90 ℃.