Preparation process of corrosion-resistant buried petroleum pipeline and prepared product

文档序号：1261782 发布日期：2020-08-25 浏览：33次中文

阅读说明：本技术 一种耐腐蚀石油埋地管道的制备工艺及其制得的产品 (Preparation process of corrosion-resistant buried petroleum pipeline and prepared product ) 是由刘中生刘国玲于 2020-04-08 设计创作，主要内容包括：本发明公开了一种耐腐蚀石油埋地管道的制备工艺及其制得的产品,涉及石油管道技术领域。其制备方法为：S1、将玄武岩纤维单向布在浸泡液中浸泡,然后烘干至含水率小于0.1%；S2、将烘干后的玄武岩纤维单向布均匀的浸润在氧化石墨烯改性环氧树脂中；S3、将浸润有氧化石墨烯改性环氧树脂的玄武岩纤维单向布均匀缠绕在钢管外侧；S4、将缠绕好玄武岩纤维单向布的钢管置于模具中合模,脱模,冷却,即可制得石油埋地管道；使用该制备方法可制得耐腐蚀性能优异石油埋地管道。一种石油埋地管道,其具有耐腐蚀的优点。(The invention discloses a preparation process of a corrosion-resistant buried petroleum pipeline and a product prepared by the same, and relates to the technical field of petroleum pipelines. The preparation method comprises the following steps: s1, soaking the basalt fiber unidirectional cloth in a soaking solution, and then drying until the water content is less than 0.1%; s2, uniformly soaking the dried basalt fiber unidirectional cloth in the graphene oxide modified epoxy resin; s3, uniformly winding the basalt fiber unidirectional cloth soaked with the graphene oxide modified epoxy resin on the outer side of the steel pipe; s4, placing the steel pipe wound with the basalt fiber unidirectional cloth in a mould, closing the mould, demoulding and cooling to obtain the buried petroleum pipeline; the petroleum buried pipeline with excellent corrosion resistance can be prepared by using the preparation method. An underground petroleum pipeline has the advantage of corrosion resistance.)

1. A preparation process of a corrosion-resistant buried petroleum pipeline is characterized by comprising the following steps:

s1, soaking the basalt fiber unidirectional cloth in a soaking solution, then drying until the water content is less than 0.1 percent,

s2, uniformly soaking the dried basalt fiber unidirectional cloth in the graphene oxide modified epoxy resin;

s3, uniformly winding the basalt fiber unidirectional cloth soaked with the graphene oxide modified epoxy resin on the outer side of the steel pipe;

s4, placing the steel pipe wound with the basalt fiber unidirectional cloth in a mould, closing the mould, demoulding and cooling to obtain the buried petroleum pipeline;

the graphene oxide modified epoxy resin is prepared from the following raw materials: epoxy resin powder, graphene oxide and acetone.

2. The preparation process of the corrosion-resistant buried petroleum pipeline according to claim 1, wherein in the step S1, the graphene oxide modified epoxy resin comprises the following preparation steps:

the weight ratio of the graphene oxide suspension dispersion liquid to the epoxy resin powder is (3.2-9): 500, a step of;

the weight ratio of the mixed solution to acetone is (18-20): 1.

3. the preparation process of the corrosion-resistant buried petroleum pipeline according to claim 2, wherein the graphene oxide suspension dispersion liquid is prepared by the following steps:

mixing graphene oxide and a solvent according to a weight ratio of 5: (8-15) and uniformly mixing to obtain a graphene oxide suspension dispersion liquid;

the solvent is selected from any one of water, ethylene glycol and tetrahydrofuran.

4. The preparation process of the corrosion-resistant buried petroleum pipeline according to claim 2, wherein in the preparation of the graphene oxide suspension dispersion liquid, the ultrasonic frequency is 50-55 kHz.

5. The preparation process of the corrosion-resistant buried petroleum pipeline according to claim 1, wherein in the step S4, the mold closing pressure is 1.4-1.6 MPa, the mold closing temperature is 70-80 ℃, and the mold closing heat preservation time is 50-55 min.

6. The preparation process of the corrosion-resistant buried petroleum pipeline according to claim 1, wherein the infiltration time in the step S2 is 4-6 hours, and the infiltration temperature is 42-48 ℃.

7. The preparation process of the corrosion-resistant buried petroleum pipeline according to claim 1, wherein the soaking solution in the step S1 is prepared from the following raw materials in parts by weight:

1-2 parts of acetone, 1-2 parts of alcohol, 2-3 parts of ethyl acetate and 47-50 parts of deionized water.

8. The preparation process of the corrosion-resistant buried petroleum pipeline according to claim 1, wherein the temperature of the soaking solution in the step S1 is 25-40 ℃, the soaking time is 2-3 h, and the drying temperature is 60-70 ℃.

9. The preparation process of the corrosion-resistant buried petroleum pipeline according to claim 1, wherein in the step S3, when the basalt fiber unidirectional cloth is uniformly wound on the outer side of the steel pipe, 2-4 layers of basalt fiber unidirectional cloth are wound.

10. A corrosion-resistant buried petroleum pipeline, which is characterized by comprising a product prepared by the preparation process of any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of petroleum pipelines, in particular to a preparation process of a corrosion-resistant buried petroleum pipeline and a product prepared by the preparation process.

Background

The buried pipeline is used as a transmission carrier of oil gas, is one of important facilities of ground engineering, and is a link for connecting upstream resources and downstream users. However, as the pipeline is buried underground for a long time, the corrosion factor on the pipeline is gradually increased due to the influence of factors such as external soil characteristics and terrain settlement, the increase of the water content of crude oil, and the profit change of seasonal soil on the pipeline, the pipeline can be corroded, perforated and leaked to influence the normal production of petroleum, and even environmental pollution and potential safety hazard can be caused seriously to bring serious loss to the country.

At present, the corrosion prevention research of foreign buried petroleum pipelines mainly focuses on the aspect of inorganic coatings, namely, the pipelines are plated with metal, and the corrosion prevention research has the advantages of high technical difficulty, high cost and low efficiency. The anticorrosion research of domestic petroleum buried pipelines mainly focuses on the aspects of organic coatings, such as polyethylene protective coatings, epoxy powder protective coatings and the like, but as the surfaces of the organic coatings have a large number of loose holes and have a certain crack tendency, some corrosive media can permeate into the surfaces of base materials through micropores and cracks, so that the corrosion of metal surfaces is accelerated.

Disclosure of Invention

Aiming at the defects in the prior art, the first object of the invention is to provide a preparation process of a buried petroleum pipeline, which can prepare the buried petroleum pipeline with excellent corrosion resistance.

A second object of the present invention is to provide an underground petroleum pipeline, which has the advantage of corrosion resistance.

In order to achieve the first object, the invention provides the following technical scheme: a preparation process of a corrosion-resistant buried petroleum pipeline comprises the following steps:

s1, soaking the basalt fiber unidirectional cloth in a soaking solution, then drying until the water content is less than 0.1 percent,

s2, uniformly soaking the dried basalt fiber unidirectional cloth in the graphene oxide modified epoxy resin;

s3, uniformly winding the basalt fiber unidirectional cloth soaked with the graphene oxide modified epoxy resin on the outer side of the steel pipe;

s4, placing the steel pipe wound with the basalt fiber unidirectional cloth in a mould, closing the mould, demoulding and cooling to obtain the buried petroleum pipeline;

the graphene oxide modified epoxy resin is prepared from the following raw materials: epoxy resin powder, graphene oxide and acetone.

By adopting the technical scheme, the corrosion-resistant buried pipeline in the oil field can be prepared by soaking the basalt fiber unidirectional cloth in a soaking solution for degreasing and deoiling, drying, soaking in graphene oxide modified epoxy resin, winding the soaked basalt fiber unidirectional cloth outside a steel pipe, placing the steel pipe in a mold for mold closing, demolding and cooling. The graphene oxide modified epoxy resin is uniformly distributed on the surface of the basalt fiber cloth, so that the interface adhesive force is enhanced, and the crosslinking effect is improved, so that the performances of corrosion resistance and the like are further improved; the graphene oxide modified epoxy resin can be filled between the fiber and the surface of the steel pipe, has high interface strength, is not easy to delaminate, can reduce the corrosion infringement of corrosive substances to the steel pipe, and can prolong the service life of the petroleum pipeline.

Further, in the step S1, the graphene oxide modified epoxy resin includes the following preparation steps:

uniformly mixing epoxy resin powder and the graphene oxide suspension dispersion liquid to obtain a mixed liquid, then mixing the mixed liquid with acetone, ultrasonically dispersing for 60-80 min, and stirring for 8-10 h to obtain graphene oxide modified epoxy resin; the weight ratio of the graphene oxide suspension dispersion liquid to the epoxy resin powder is (3.2-9): 500, a step of; the weight ratio of the mixed solution to acetone is (18-20): 1.

by adopting the technical scheme, the epoxy resin has a three-dimensional network structure, is brittle in nature and easy to crack, a large number of loose micropores are formed on the surface when the epoxy resin is independently used as an epoxy coating, and some corrosive media can permeate into the surface of the base material through the micropores and cracks to accelerate the metal corrosion rate. And the surface of the graphene oxide contains rich oxygen-containing groups, so that the graphene oxide is well compatible with epoxy resin, and meanwhile, the graphene oxide has a lamellar stacking structure and can play a good isolation and corrosion prevention effect on the steel base. The epoxy resin is selected from any one of bisphenol A type epoxy resin, bisphenol F type epoxy resin or other polyphenol epoxy resin, preferably, in the invention, the epoxy resin is selected from bisphenol A type epoxy resin.

Further, the graphene oxide suspension dispersion liquid is prepared as follows:

mixing graphene oxide and a solvent according to a weight ratio of 5: (8-15) and uniformly mixing to obtain a graphene oxide suspension dispersion liquid; the solvent is selected from any one of water, ethylene glycol and tetrahydrofuran.

By adopting the technical scheme, the graphene oxide suspension dispersion liquid can be prepared by mixing the graphene oxide and the solvent according to the weight ratio, and the preparation method is simple in preparation steps and easy to implement. In the invention, a small amount of amine substances can be added for adjustment during dispersion, so that the dispersion effect is improved. In order to improve the dispersion effect of the graphene oxide suspension, specifically, when water is used as a solvent, the weight ratio of the graphene oxide to the water is 5: (8-10); when ethylene glycol is used as a solvent, the weight ratio of the graphene oxide to the ethylene glycol is 5: (10-12); when tetrahydrofuran is used as a solvent, the weight ratio of the graphene oxide to the tetrahydrofuran is 5: (13-15). Graphene oxide can be selected from GO1211 or GO1222 sold in the market mountain.

Further, in the preparation of the graphene oxide suspension dispersion liquid, the ultrasonic frequency is 50-55 kHz.

By adopting the technical scheme, the ultrasonic frequency is too high, the dispersion degree is larger, partial graphene oxide is deoxidized in the ultrasonic process, the structure of the graphene oxide is seriously damaged, and the dispersion performance is reduced; the ultrasonic frequency is too small, so that the dispersion is not uniform, and the ultrasonic frequency is controlled to be 50-55 kHz, so that the graphene oxide suspension dispersion liquid with uniform dispersion is favorably prepared.

Further, in the step S4, the mold clamping pressure is 1.4-1.6 Mpa, the mold clamping temperature is 70-80 ℃, and the mold clamping heat preservation time is 50-55 min.

By adopting the technical scheme, the die closing pressure is low, the graphene oxide modified epoxy resin cannot be completely filled between the fiber and the surface of the steel pipe, the interface strength is low, the delamination is easy, and the service life of the petroleum buried pipeline is shortened; the penetration of the graphene oxide modified epoxy resin is incomplete at a short time and a low temperature, so that the interface bonding strength is influenced; the interface is easy to lose efficacy due to high die assembly pressure, long time and high temperature, the corrosion resistance of the buried oil pipeline is affected, and the service life of the buried oil pipeline is shortened.

Further, the soaking time in the step S2 is 4-6 hours, and the soaking temperature is 42-48 ℃.

By adopting the technical scheme, the basalt unidirectional fiber cloth is soaked in the graphene oxide modified epoxy resin at the temperature of 42-48 ℃ for 4-6 hours, so that the full soaking is facilitated, the gaps of the basalt unidirectional fiber cloth are filled with the graphene oxide modified epoxy resin, and the corrosion resistance of the basalt unidirectional fiber cloth can be enhanced.

Further, the soaking solution in the step S1 is prepared from the following raw materials in parts by weight:

1-2 parts of acetone, 1-2 parts of alcohol, 2-3 parts of ethyl acetate and 47-50 parts of deionized water.

By adopting the technical scheme, the basalt unidirectional fiber cloth is soaked in the soaking solution prepared by mixing acetone, alcohol, ethyl acetate and deionized water, so that the purpose of degreasing and deoiling the basalt unidirectional fiber cloth is achieved, the subsequent full soaking of the basalt unidirectional fiber cloth is facilitated, and the corrosion resistance of the basalt unidirectional fiber cloth can be improved.

Further, the temperature of the soaking solution in the step S1 is 25-40 ℃, the soaking time is 2-3 hours, and the drying temperature is 60-70 ℃.

By adopting the technical scheme, the soaking time and temperature are controlled, the degreasing and oil removing efficiency is favorably improved, and the time is saved.

Further, in the step S3, when the basalt fiber unidirectional fabric is uniformly wound around the outer side of the steel pipe, 2-4 layers of basalt fiber unidirectional fabric are wound.

By adopting the technical scheme, 2-4 layers of winding can be performed, and the corrosion resistance of the petroleum buried pipeline can be enhanced. The number of winding layers is a single layer, the anti-corrosion effect is not ideal, but the number of winding layers is too many, the effect of die assembly is also influenced, and the anti-corrosion performance can be reduced while the cost is enhanced.

In order to achieve the second object, the invention provides the following technical scheme:

the corrosion-resistant petroleum buried pipeline comprises a product prepared by the preparation process, and the product comprises a steel pipe inner layer and a basalt fiber outer layer, has excellent corrosion resistance, and has better corrosion resistance under severe working conditions.

In conclusion, the invention has the following beneficial effects: the corrosion-resistant oil field buried pipeline is prepared by soaking the basalt fiber unidirectional cloth in a soaking solution to degrease and remove oil, drying, soaking in graphene oxide modified epoxy resin, winding the soaked basalt fiber unidirectional cloth outside a steel pipe, placing the basalt fiber unidirectional cloth in a mold to be matched, demolding and cooling. The graphene oxide modifies the epoxy resin, so that the defects that the epoxy resin is easy to crack and has loose cavities can be overcome, and the corrosion resistance of the epoxy resin is further improved; the graphene oxide modified epoxy resin is uniformly distributed on the surface of the basalt fiber cloth, can be filled between the fiber and the surface of the steel pipe, has high interface strength, is not easy to delaminate, can reduce the corrosion damage of corrosive substances to the steel pipe, and prolongs the service life of the petroleum pipeline.

Detailed Description

Preparation example

Preparation example 1