CN112371468A - Carbon fiber anti-corrosion method for oil field valve bank - Google Patents
Carbon fiber anti-corrosion method for oil field valve bank Download PDFInfo
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- CN112371468A CN112371468A CN202011335430.0A CN202011335430A CN112371468A CN 112371468 A CN112371468 A CN 112371468A CN 202011335430 A CN202011335430 A CN 202011335430A CN 112371468 A CN112371468 A CN 112371468A
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 72
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 72
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005260 corrosion Methods 0.000 title claims description 31
- 239000002131 composite material Substances 0.000 claims abstract description 28
- 239000004744 fabric Substances 0.000 claims abstract description 20
- 239000010410 layer Substances 0.000 claims description 36
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 18
- 239000003921 oil Substances 0.000 claims description 15
- 239000003822 epoxy resin Substances 0.000 claims description 13
- 229920000647 polyepoxide Polymers 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 9
- 229910003460 diamond Inorganic materials 0.000 claims description 9
- 239000010432 diamond Substances 0.000 claims description 9
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 9
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000003960 organic solvent Substances 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 abstract description 4
- 239000003513 alkali Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000002787 reinforcement Effects 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 description 11
- 238000005536 corrosion prevention Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002332 oil field water Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/002—Pretreatement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/007—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
- B05D7/146—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies to metallic pipes or tubes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2254/00—Tubes
- B05D2254/02—Applying the material on the exterior of the tube
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2244—Oxides; Hydroxides of metals of zirconium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
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- Inorganic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
Abstract
The embodiment of the invention discloses a carbon fiber anticorrosion method for an oilfield valve bank, and belongs to the technical field of oilfield pipeline anticorrosion. The invention carries out reinforcement and carbon fiber anticorrosion treatment on the outer surface of the valve bank in the oil field by adopting the composite layer formed by the carbon fiber composite material and the carbon fiber cloth, the mode is a reverse thinking of the lining of the pipeline, and is a brand new innovative thought, even if the valve bank which is working is corroded and perforated, even is completely corroded, the valve bank can bear the pressure of more than 20Mpa by depending on the composite layer on the outer surface, so that the service life of the valve bank is prolonged by 15 years to 20 years, the technical problems that the existing small-pipe-diameter pipeline cannot carry out internal anticorrosion and the service life of the valve bank is short are solved, the valve bank can not be peeled off or fall off under severe environments of strong acid, strong alkali, high temperature and the like, can be applied to the external anticorrosion without stopping production of each valve bank.
Description
Technical Field
The invention relates to the technical field of corrosion prevention of oil field pipelines, in particular to a carbon fiber corrosion prevention method for an oil field valve bank.
Background
With the extended development time of oil field exploration and development and the development of multilayer systems, the corrosion of ground pipelines is increased. For example, 600 gathering pipelines in the Ansai oilfield leak 710 times in the last 3 years. Wherein 256 pipelines outside the station leak for 320 times, accounting for 42.7 percent of the total number; the pipe network in the station breaks through 344 pieces, 390 times, and accounts for 57.3 percent of the total number. The pipeline leakage factors mainly include pipeline external corrosion, pipeline internal corrosion, manufacturing and construction defects, third-party damage, geological disasters and the like, but the pipeline corrosion factor accounts for nearly 90%. From the leakage position of the pipeline, the pipeline body mainly caused by internal corrosion is mostly damaged, and the proportion is 85.3%; from the service life, the service life of the leakage pipeline is centralized at 3-10 years, and the proportion is 77.5%; from the water content of the medium, the pipeline with the water content of more than 40% leaks 90 times, the proportion is 88.2%, and the pipeline built before 2015 is not subjected to an internal corrosion prevention process, so that the corrosion rate of the pipeline is increased, particularly, the existing water valve bank is difficult to perform internal corrosion prevention due to small pipe diameter which is generally less than 60mm and becomes an important part for corrosion of a water injection pipeline, according to statistics, the service life of the existing water valve bank without internal corrosion prevention treatment is three years, and individual serious corrosion operation is scrapped due to serious corrosion after six months.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the carbon fiber anti-corrosion method for the oilfield valve bank, which is low in cost, safe, reliable and environment-friendly, and can prolong the service life of the valve bank by 15-20 years by adopting a mode of external reinforcement and carbon fiber anti-corrosion on the outer surface of the valve bank, thereby solving the technical problem of short service life of the prior valve bank.
In order to achieve the purpose, the invention adopts the following technical scheme: an anti-corrosion method for carbon fiber of an oil field valve bank comprises the following specific steps:
(1) carrying out appearance detection on the valve bank to be subjected to anti-corrosion treatment, and screening out the valve bank capable of being used for anti-corrosion treatment;
(2) descaling and deoiling the screened valve bank;
(3) carrying out sand blasting and rust removal on the outer surface of the valve group to ensure that the outer surface of the valve group reaches the Sa2.5-grade standard;
(4) cleaning the outer surface of the valve group by using an organic solvent;
(5) placing the cleaned valve bank for more than 30 minutes, and naturally drying;
(6) chemically removing rust on the outer surface of the valve group, and blackening the surface layer;
(7) coating the outer surface of the valve bank once by using a carbon fiber composite material, wherein the coating thickness is 200-600 mu m;
(8) heating the carbon fiber cloth to be mixed for more than 45 minutes at the temperature of 50-110 ℃;
(9) mixing the carbon fiber composite material and the carbon fiber cloth for 1 hour;
(10) applying the mixed carbon fiber cloth on the outer surface of the valve group, wherein the carbon fiber cloth is at least two layers;
(11) and maintaining for 12 hours to finish the anticorrosion work of the valve bank.
As a modification of the invention, in the step (10), the carbon fiber cloth has three layers, wherein the thickness of the first layer is 50 μm to 70 μm, the thickness of the second layer is 60 μm to 90 μm, and the thickness of the third layer is 30 μm to 50 μm;
the first layer is applied 40 to 70 minutes before the second layer is applied and the second layer is applied 50 to 90 minutes before the third layer is applied.
As an improvement of the invention, the carbon fiber composite material is composed of a component A and a component B, wherein in the component A, 50 kg-100 kg of carbon fiber powder, 30 kg-70 kg of silicon carbide, 65 kg-150 kg of alumina, 30 kg-40 kg of diamond powder and 20 kg-50 kg of zirconia; in the component B, 100 kg-240 kg of modified epoxy resin and 100 kg-240 kg of accelerator are used.
As an improvement of the invention, in the component A, 70 kg-80 kg of carbon fiber powder, 40 kg-60 kg of silicon carbide, 95 kg-120 kg of alumina, 30 kg-40 kg of diamond powder and 30 kg-40 kg of zirconia; in the component B, the modified epoxy resin is 150 kg-190 kg, and the accelerator is 150 kg-190 kg.
As an improvement of the invention, in the component A, 70 kg-80 kg of carbon fiber powder, 40 kg-60 kg of silicon carbide, 105 kg-110 kg of alumina, 30 kg-40 kg of diamond powder and 30 kg-40 kg of zirconia; in the component B, 160 kg-180 kg of modified epoxy resin and 160 kg-180 kg of accelerator are used.
As an improvement of the invention, the preparation method of the carbon fiber composite material is that firstly, raw materials of the component A are put into a container to be mixed and stirred uniformly; secondly, grinding by a grinder until the fineness reaches 200-400 meshes; thirdly, heating to 120-200 ℃; and fourthly, adding the improved epoxy resin and the accelerator in the component B, and continuously stirring and uniformly mixing.
The invention has the beneficial effects that: according to the invention, the composite layer formed by the carbon fiber composite material and the carbon fiber cloth is used for reinforcing the outer surface of the valve bank in the oil field and performing carbon fiber anti-corrosion treatment, the mode is a reverse thinking of a pipeline lining, is a brand new innovative thought, and is suitable for carbon fiber anti-corrosion treatment of the valve bank with multiple tee joints, multiple elbows, multiple welded junctions, small length and small pipe diameter; even if the valve bank in work is corroded and perforated or even completely corroded, the valve bank can bear pressure of more than 20Mpa by means of a composite layer on the outer surface, so that the service life of the valve bank is prolonged by 15 years to 20 years, and the technical problems that an existing small-pipe-diameter pipeline cannot be subjected to internal corrosion prevention and the service life of the valve bank is short are solved.
In addition, the treated valve bank for the oil field can meet the corrosion prevention requirement of the water injection environment (containing salt, sulfur, carbon dioxide and bacteria, high temperature and high pressure) of the oil field; the coating has strong adhesive force, can not be peeled off or fall off under severe environments such as strong acid, strong alkali, high temperature and the like, can be applied to non-stop external corrosion prevention of various oilfield valve banks, and has great significance for saving the cost of operating areas and oil production plants.
Detailed Description
An anti-corrosion method for carbon fiber of an oil field valve bank comprises the following specific steps:
(1) carrying out appearance detection on the valve bank to be subjected to anti-corrosion treatment, and screening out the valve bank capable of being used for anti-corrosion treatment; the valve group which cannot be used after deformation is not subjected to corrosion prevention treatment;
(2) descaling and deoiling the screened valve bank;
(3) carrying out sand blasting and rust removal on the outer surface of the valve group to ensure that the outer surface of the valve group reaches the Sa2.5-grade standard;
(4) cleaning the outer surface of the valve group by using an organic solvent;
(5) placing the cleaned valve bank for more than 30 minutes, and naturally drying;
(6) chemically removing rust on the outer surface of the valve group, and blackening the surface layer;
(7) the outer surface of the valve bank is coated with the carbon fiber composite material once, and the coating thickness is 200-600 μm, preferably 400-500 μm;
(8) heating the carbon fiber cloth to be mixed for more than 45 minutes at the temperature of 50-110 ℃;
(9) mixing the carbon fiber composite material and the carbon fiber cloth for 1 hour;
(10) applying the heated carbon fiber cloth on the outer surface of the valve group, wherein the carbon fiber cloth is at least two layers;
(11) and maintaining for 12 hours to finish the anticorrosion work of the valve bank.
And after the anticorrosion step is finished, smearing epoxy putty on the outer surface of the valve group, and finally spraying different surface paints according to the user requirements, namely finishing the valve group product required by the user.
Preferably, in the step (10), the carbon fiber cloth has three layers, a first layer having a thickness of 50 to 70 μm, a second layer having a thickness of 60 to 90 μm, and a third layer having a thickness of 30 to 50 μm; the first layer is applied 40 to 70 minutes before the second layer is applied and the second layer is applied 50 to 90 minutes before the third layer is applied.
The carbon fiber composite material applied to the outer surface of the valve block forms a coating, and the carbon fiber cloth of the coating applied to the outer surface of the valve block forms a reinforcing layer, that is, the reinforcing layer is directly applied to the coating. The coating and the reinforcing layer jointly form a composite layer, namely the composite layer is arranged on the outer surface of the valve bank to reinforce the valve bank and perform carbon fiber anticorrosion treatment.
Preferably, the carbon fiber composite material consists of a component A and a component B, wherein in the component A, 50 kg-100 kg of carbon fiber powder, 30 kg-70 kg of silicon carbide, 65 kg-150 kg of alumina, 30 kg-40 kg of diamond powder and 20 kg-50 kg of zirconia are contained; in the component B, 100 kg-240 kg of modified epoxy resin and 100 kg-240 kg of accelerator are used. The preparation method comprises the following steps of firstly, putting the raw materials of the component A into a container, and uniformly mixing and stirring; secondly, grinding by a grinder until the fineness reaches 200-400 meshes; thirdly, heating to 120-; and fourthly, adding the improved epoxy resin and the accelerator in the component B, and continuously stirring and uniformly mixing.
Preferably, in the component A, 70kg to 80kg of carbon fiber powder, 40kg to 60kg of silicon carbide, 95kg to 120kg of alumina, 30kg to 40kg of diamond powder and 30kg to 40kg of zirconia; in the component B, the modified epoxy resin is 150 kg-190 kg, and the accelerator is 150 kg-190 kg.
Preferably, in the component A, 70kg to 80kg of carbon fiber powder, 40kg to 60kg of silicon carbide, 105kg to 110kg of alumina, 30kg to 40kg of diamond powder and 30kg to 40kg of zirconia; in the component B, 160 kg-180 kg of modified epoxy resin and 160 kg-180 kg of accelerator are used.
The preparation method of the carbon fiber composite material comprises the following steps of firstly, putting raw materials of the component A into a container, and uniformly mixing and stirring the raw materials; secondly, grinding by a grinder until the fineness reaches 200-400 meshes; thirdly, heating to 120-200 ℃; and fourthly, adding the improved epoxy resin and the accelerator in the component B, and continuously stirring and uniformly mixing.
It should be noted that the carbon fiber composite material may also be a composite material disclosed in chinese patent ZL 201310729946.7, an oil pipeline with a carbon fiber inner coating, which was filed by the inventor on 26.12.2013.
The composite layer formed by the carbon fiber composite material and the carbon fiber cloth arranged on the outer surface of the valve group is detected under three test conditions, and the detection indexes are as follows:
through above performance testing, this anticorrosive composite bed can satisfy the anticorrosive needs of oil field water injection environment (contain salt, contain sulphur, contain carbon dioxide, bacterium, high temperature high pressure), and it has stronger adhesive force, can not peel off, not fall off under adverse circumstances such as strong acid strong alkali and high temperature, can be applied to the anticorrosive work like Ansai oil field valves.
In conclusion, the composite layer formed by the carbon fiber composite material and the carbon fiber cloth is used for carrying out external reinforcement and carbon fiber anticorrosion treatment on the oilfield valve bank, the reverse thinking of the lining of the pipeline is realized, the technical problems that the existing pipeline with small pipe diameter cannot carry out internal anticorrosion and is short in service life are solved, the service life of the valve bank treated by the method can be prolonged by 15 years to 20 years, and the method is suitable for carbon fiber anticorrosion treatment of the pipeline valve bank comprising a tee joint, multiple bends, short pipelines with the length of less than 1 meter and pipeline valves with the pipe diameter of less than 60 mm; the carbon fiber anti-corrosion agent has excellent high-temperature and high-pressure corrosion resistance and strong adhesive force, can not be peeled off and fall off under severe environments such as strong acid, strong alkali, high temperature and the like, can be applied to places of non-stop production and external anti-corrosion of various oilfield valve banks, namely, the carbon fiber anti-corrosion agent can be subjected to carbon fiber anti-corrosion treatment under the condition of not influencing the normal work of an operation valve bank, and has great significance for saving the cost of an operation area and an oil extraction plant.
The method for preventing corrosion of the carbon fiber of the valve group in the oil field is described in detail, a specific example is applied in the method for explaining the principle and the implementation mode of the method, and the example is only used for helping to understand the method and the core idea of the method; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. The carbon fiber anticorrosion method for the oilfield valve bank is characterized by comprising the following specific steps of:
(1) carrying out appearance detection on the valve bank to be subjected to anti-corrosion treatment, and screening out the valve bank capable of being used for anti-corrosion treatment;
(2) descaling and deoiling the screened valve bank;
(3) carrying out sand blasting and rust removal on the outer surface of the valve group to ensure that the outer surface of the valve group reaches the Sa2.5-grade standard;
(4) cleaning the outer surface of the valve group by using an organic solvent;
(5) placing the cleaned valve bank for more than 30 minutes, and naturally drying;
(6) chemically removing rust on the outer surface of the valve group, and blackening the surface layer;
(7) coating the outer surface of the valve bank once by using a carbon fiber composite material, wherein the coating thickness is 200-600 mu m;
(8) heating the carbon fiber cloth to be mixed for more than 45 minutes at the temperature of 50-110 ℃;
(9) mixing the carbon fiber composite material and the carbon fiber cloth for 1 hour;
(10) applying the mixed carbon fiber cloth on the outer surface of the valve group, wherein the carbon fiber cloth is at least two layers;
(11) and maintaining for 12 hours to finish the anticorrosion work of the valve bank.
2. The carbon fiber anti-corrosion method for the valve group in the oilfield according to claim 1, wherein in the step (10), the carbon fiber cloth has three layers, wherein the thickness of the first layer is 50 μm to 70 μm, the thickness of the second layer is 60 μm to 90 μm, and the thickness of the third layer is 30 μm to 50 μm;
the first layer is applied 40 to 70 minutes before the second layer is applied and the second layer is applied 50 to 90 minutes before the third layer is applied.
3. The carbon fiber anti-corrosion method for the valve block in the oil field as claimed in claim 1 or 2, wherein the carbon fiber composite material is composed of a component A and a component B, wherein in the component A, 50 kg-100 kg of carbon fiber powder, 30 kg-70 kg of silicon carbide, 65 kg-150 kg of alumina, 30 kg-40 kg of diamond powder and 20 kg-50 kg of zirconia; in the component B, 100 kg-240 kg of modified epoxy resin and 100 kg-240 kg of accelerator are used.
4. The carbon fiber anticorrosion method for the valve bank in the oilfield according to claim 3, which is characterized in that: in the component A, 70kg to 80kg of carbon fiber powder, 40kg to 60kg of silicon carbide, 95kg to 120kg of alumina, 30kg to 40kg of diamond powder and 30kg to 40kg of zirconia; in the component B, the modified epoxy resin is 150 kg-190 kg, and the accelerator is 150 kg-190 kg.
5. The carbon fiber anticorrosion method for the valve bank in the oilfield according to claim 3, which is characterized in that: in the component A, 70kg to 80kg of carbon fiber powder, 40kg to 60kg of silicon carbide, 105kg to 110kg of alumina, 30kg to 40kg of diamond powder and 30kg to 40kg of zirconia; in the component B, 160 kg-180 kg of modified epoxy resin and 160 kg-180 kg of accelerator are used.
6. The carbon fiber anticorrosion method for the valve bank in the oilfield according to claim 3, which is characterized in that: the preparation method of the carbon fiber composite material comprises the following steps of firstly, putting raw materials of the component A into a container, and uniformly mixing and stirring the raw materials; secondly, grinding by a grinder until the fineness reaches 200-400 meshes; thirdly, heating to 120-200 ℃; and fourthly, adding the improved epoxy resin and the accelerator in the component B, and continuously stirring and uniformly mixing.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103775754A (en) * | 2013-12-26 | 2014-05-07 | 孙家成 | Oil pipeline with carbon fiber internal coating and manufacturing method thereof |
| CN111878665A (en) * | 2020-08-04 | 2020-11-03 | 青岛泰能科技实业发展有限公司 | Method for preventing corrosion of submarine pipeline |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103775754A (en) * | 2013-12-26 | 2014-05-07 | 孙家成 | Oil pipeline with carbon fiber internal coating and manufacturing method thereof |
| CN111878665A (en) * | 2020-08-04 | 2020-11-03 | 青岛泰能科技实业发展有限公司 | Method for preventing corrosion of submarine pipeline |
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