CN-117802491-B - Abradable coating for inhibiting hydrate growth and preparation method thereof

Abstract

The invention discloses an abradable coating for inhibiting hydrate growth and a preparation method thereof, and belongs to the technical field of petroleum and natural gas transportation. The preparation method comprises the steps of adopting a ball milling method to treat copper powder and graphene powder to obtain graphene/copper composite powder, adopting a cold spraying method to prepare a graphene/copper porous coating on the surface of a matrix, adopting an anodic oxidation method to modify the surface of the graphene/copper porous coating to obtain a coating with nano-strip Cu 2 O/CuO composite oxide on the surface, and adopting a low-surface energy substance to carry out infiltration treatment on the coating with nano-strip Cu 2 O/CuO composite oxide on the surface to obtain the abradable coating for inhibiting hydrate generation.

Inventors

• WANG JUN
• CHEN YUEFENG
• WANG PENG
• Gao Xiongxiong
• WANG LEI

Assignees

• 中国石油天然气集团有限公司
• 中国石油集团工程材料研究院有限公司

Dates

Publication Date

20260512

Application Date

20220930

Claims (8)

1. 1. A method of preparing an abradable coating for inhibiting the growth of hydrates comprising the steps of: s1, treating graphene powder and copper powder by adopting a ball milling method to obtain graphene/copper composite powder; s2, preparing a graphene/copper porous coating on the surface of a matrix by adopting a cold spraying method; S3, modifying the surface of the graphene/copper porous coating by adopting an anodic oxidation method to obtain a coating with nano strip-shaped Cu 2 O/CuO composite oxide on the surface; s4, impregnating the coating with the nano strip-shaped Cu 2 O/CuO composite oxide on the surface by adopting a low-surface energy substance to obtain a hydrophobic abradable coating for inhibiting the generation of hydrate; In the step S4, the low surface energy substance is one of stearic acid-ethanol solution, fluorosilane or tetradecanoic acid.
2. 2. The method for preparing an abradable coating for inhibiting hydrate growth according to claim 1, wherein in S1, the ball milling method comprises the steps of: S01, mixing graphene powder and copper powder according to a mass ratio of (0.5-1) to 100 to obtain mixed powder; s02, putting the mixed powder and zirconia balls into a ball mill together according to a mass ratio of 1:100, adding ethanol, performing ball milling treatment, and removing the zirconia balls to obtain composite slurry; and S03, drying, crushing and screening the composite slurry to obtain the graphene/copper composite powder.
3. 3. The method for preparing an abradable coating for inhibiting hydrate growth according to claim 1, wherein in S2, the thickness of the graphene/copper porous coating is 200-300 μm.
4. 4. A method of preparing an abradable coating to inhibit hydrate growth as claimed in claim 1, wherein the substrate is further grit blasted prior to use.
5. 5. The method for producing an abradable coating for inhibiting hydrate growth according to claim 4, wherein the sand size of the blasting is 200 to 400 mesh, the blasting angle of the blasting is 45 to 70 degrees, and the gas pressure of the blasting is 0.5 to 0.8mpa.
6. 6. The method for preparing an abradable coating for inhibiting the growth of hydrates according to claim 1, wherein in the step S3, the anodic oxidation electrolyte is a NaOH solution, the anodic oxidation current density is 1-10 mA cm -2 , the anodic oxidation time is 20-30min, and the anodic oxidation temperature is 15-30 ℃.
7. 7. The method for preparing an abradable coating for inhibiting the growth of hydrates according to claim 1, wherein in S4, the infiltration treatment is to soak the coating in a low surface energy substance and vacuum the low surface energy substance completely infiltrates the coating and then dry the coating.
8. 8. An abradable coating for inhibiting hydrate growth produced by the method for producing an abradable coating for inhibiting hydrate growth as claimed in any one of claims 1 to 7.

Description

Abradable coating for inhibiting hydrate growth and preparation method thereof Technical Field The invention belongs to the technical field of petroleum and natural gas transportation, and particularly relates to an abradable coating for inhibiting hydrate growth and a preparation method thereof. Background Natural gas hydrate is a hydrocarbon with a solid density greater than that of the fluid. In hydrocarbon transport pipelines where free water is present, hydrates may form on the inner walls of the pipeline when the pressure in the pipeline is sufficiently high or the temperature is sufficiently low. The hydrate particles are nucleated, grown and aggregated in the pipeline to cause pipeline or valve blockage, so that economic loss or personnel injury is directly caused, and the service safety of the pipeline is affected. In general, methods for inhibiting the plugging of a conduit by hydrates in oil and gas pipelines include physical and chemical methods. The physical method is to change the physical condition of hydrate formation in the pipeline by increasing the temperature or reducing the pressure of the pipeline so as to achieve the purpose of preventing and treating the formation of the hydrate. The chemical method is to add a certain amount of thermodynamic inhibitor and a low dosage of hydrate inhibitor into a pipeline to break the phase balance of the hydrate, thereby preventing the generation of the hydrate. The physical method is complex to operate, has strict requirements on service equipment and working conditions, and is not suitable for field operation under complex working conditions. For the chemical method, the consumption of the thermodynamic inhibitor is large, the production cost is obviously increased, the thermodynamic inhibitor has certain toxicity, the dosage of the low-dosage hydrate is small, but the preparation cost is high, the thermodynamic inhibitor is difficult to adapt to complex components in a pipeline, and the nano powder also has pollution to the environment, so that the practical production requirement is difficult to meet. Disclosure of Invention In order to overcome the defect that the method for inhibiting the hydrate in the oil and gas pipeline from blocking the pipeline is difficult to meet the actual production requirement in the prior art, the invention aims to provide an abradable coating for inhibiting the growth of the hydrate and a preparation method thereof. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: the invention provides a preparation method of an abradable coating for inhibiting the growth of hydrate, which comprises the following steps: s1, treating graphene powder and copper powder by adopting a ball milling method to obtain graphene/copper composite powder; s2, preparing a graphene/copper porous coating on the surface of a matrix by adopting a cold spraying method; S3, modifying the surface of the graphene/copper porous coating by adopting an anodic oxidation method to obtain a coating with nano strip-shaped Cu 2 O/CuO composite oxide on the surface; and S4, impregnating the coating with the nano strip-shaped Cu 2 O/CuO composite oxide on the surface by adopting a low-surface energy substance to obtain the abradable coating for inhibiting the generation of hydrate. In the step S1, the ball milling method includes the following steps: S01, mixing graphene powder and copper powder according to a mass ratio of (0.5-1) to 100 to obtain mixed powder; s02, putting the mixed powder and zirconia balls into a ball mill together according to a mass ratio of 1:100, adding ethanol, performing ball milling treatment, and removing the zirconia balls to obtain composite slurry; and S03, drying, crushing and screening the composite slurry to obtain the graphene/copper composite powder. In the S2, the thickness of the graphene/copper porous coating is 200-300 μm. In the invention, in the step S2, the working gas of the cold spraying method is nitrogen, the gas heating temperature of the cold spraying method is 260-550 ℃, the main gas pressure of the cold spraying method is 2-2.8 MPa, the powder feeding rate of the cold spraying method is 1.5-2 r/min, the spraying distance of the cold spraying method is 25-40 mm, and the moving speed of a spray gun of the cold spraying method is 30-40 mm/S. The invention further provides that the substrate is sandblasted prior to use. The sand grain size of the sand blasting is 200-400 meshes, the injection angle of the sand blasting is 45-70 degrees, and the gas pressure of the sand blasting is 0.5-0.8 MPa. In the invention, in the step S3, the anodic oxidation electrolyte is a NaOH solution, the anodic oxidation current density is 1-10 mA.cm -2, the anodic oxidation time is 20-30 min, and the anodic oxidation temperature is 15-30 ℃. In the step S4, the low surface energy substance is one of stearic acid-ethanol solution, fluorosilane or tetradecanoic acid. In the step