CN109707953B - Surface corrosion-resistant heat-insulating composite material for oil field storage equipment and conveying pipeline - Google Patents
Surface corrosion-resistant heat-insulating composite material for oil field storage equipment and conveying pipeline Download PDFInfo
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- CN109707953B CN109707953B CN201910043152.2A CN201910043152A CN109707953B CN 109707953 B CN109707953 B CN 109707953B CN 201910043152 A CN201910043152 A CN 201910043152A CN 109707953 B CN109707953 B CN 109707953B
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Abstract
The invention provides a surface corrosion-resistant heat-insulating composite material for oilfield storage equipment and a conveying pipeline, which comprises a bottom layer, a heat-insulating middle layer and an organic corrosion-resistant surface layer, wherein the bottom layer is directly attached to the outer surfaces of the oilfield storage equipment and the conveying pipeline, the heat-insulating middle layer is of a multilayer structure, and the organic corrosion-resistant surface layer is made of epoxy resin. The heat preservation intermediate level uses a set of composite construction to carry out repeated stack as minimum unit group and constitutes, composite construction includes tertiary heat preservation unit layer, and first order heat preservation unit layer is coarse grain silica porous powder layer/rock wool layer, and third level heat preservation unit layer is fine grain silica porous powder layer/rock wool layer, and second level heat preservation unit layer is mixed particle size silica porous powder layer/rock wool layer. The corrosion-resistant heat-insulating composite material can be used for heat insulation of the outer surfaces of oil-gas storage equipment and oil-gas conveying pipelines, and has the advantages of excellent effect and simple and convenient construction method.
Description
Technical Field
The invention relates to a heat insulation material for the surfaces of oil field storage equipment and a conveying pipeline, in particular to a surface corrosion-resistant heat insulation composite material for the oil field storage equipment and the conveying pipeline and a preparation method thereof.
Background
The normal use of oil and gas storage equipment and oil and gas transmission pipelines in oil fields is seriously affected by low temperature problems caused by season alternation and weather changes, so the heat preservation of the oil and gas storage equipment and the oil and gas transmission pipelines in the oil fields in winter or during sudden temperature drop is very important.
The method is one of common methods for solving the problems that the outer surfaces of the oil and gas storage device and the oil and gas conveying pipeline are filled or wound by adopting thick organic matters, polyurethane and the like are used as an anticorrosive layer to serve as an insulating layer, but the biggest defect is that enough large space needs to be reserved for the preparation of the insulating layer on the outer surfaces of the oil and gas storage device and the oil and gas conveying pipeline, the outer surfaces of the oil and gas storage device and the oil and gas conveying pipeline need to be regular appearance structures, and otherwise, the thick insulating layer is difficult to realize. The hollow pipeline is adopted to carry out hot water circulation at a specific temperature to ensure that the oil-gas storage equipment and the oil-gas conveying pipeline are not obviously influenced by the external temperature, and the method is a common treatment method, but also has the problems of requirements on a heat preservation space and great control difficulty and complexity. The method for preparing the heat-insulating layer on the outer surface of the oil-gas storage equipment and the oil-gas conveying pipeline by adopting the composite coating is also an effective method, the construction difficulty is low, the thickness of the heat-insulating layer is far lower than that of the former two treatment methods, so that the requirement on the heat-insulating space is low, and the heat-insulating layer becomes a popular treatment method.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide a corrosion-resistant heat-insulating composite material with excellent effect and simple and convenient construction method and a preparation method thereof through optimization and special design of the type, structure and glue substances of the heat-insulating material.
The invention provides a surface corrosion-resistant heat-insulating composite material for oilfield storage equipment and conveying pipelines, which adopts the main technical scheme that: the oil field storage device comprises a bottom layer, a heat-preservation middle layer and an organic corrosion-resistant surface layer, wherein the bottom layer is directly attached to the outer surfaces of the oil field storage device and the conveying pipeline, the heat-preservation middle layer is of a multilayer structure, the components of the heat-preservation middle layer comprise porous silicon dioxide powder, rock wool fibers and polyvinyl alcohol, and the component of the organic corrosion-resistant surface layer is epoxy resin.
The invention provides a surface corrosion-resistant heat-insulating composite material for oilfield storage equipment and conveying pipelines, which also adopts the following auxiliary technical scheme:
the bottom layer is a bottom rock wool layer with the thickness of 50-100 microns, the porosity of the bottom rock wool layer is not more than 10%, and polyvinyl alcohol hydrosol is used as a bonding agent to bond the bottom rock wool layer with the surfaces of the oil field storage equipment and the conveying pipeline.
The thickness in heat preservation intermediate level is 1~50 millimeters, the heat preservation intermediate level uses a set of composite construction to carry out repeated stack as minimum unit group and constitutes, composite construction includes tertiary heat preservation unit layer, and first order heat preservation unit layer is coarse grain silica porous powder layer rock wool layer, and third level heat preservation unit layer is fine grain silica porous powder layer rock wool layer, and second level heat preservation unit layer is mixed granularity silica porous powder layer rock wool layer, adopt the polyvinyl alcohol hydrosol as the binder in the heat preservation intermediate level.
The particle size of the silicon dioxide porous powder in the coarse particle silicon dioxide porous powder layer is 1-10 microns, the particle size of the silicon dioxide porous powder in the fine particle silicon dioxide porous powder layer is 50-100 nanometers, the proportion of the fine particle silicon dioxide porous powder to the coarse particle silicon dioxide porous powder in the mixed particle silicon dioxide porous powder layer is 1: 1-1: 5 in percentage by mass, the pore diameters of the coarse particle silicon dioxide porous powder and the fine particle silicon dioxide porous powder are both 20-40 nanometers, and the porosity is not lower than 90%. When the pore diameter is less than 50 nm, air molecules in pores are in the characteristic of difficult free movement, so that the pore diameter of the porous silica powder is limited to 20-40 nm, and the design of two particle diameters and the proportion of coarse particle porous silica powder and fine particle porous silica powder fully considers the strength, the thickness and the heat insulation effect of the heat insulation material, particularly the step-by-step transition of the pore diameter of the porous silica powder in three-stage heat insulation unit layers from the coarse particle porous silica powder, the mixed particle porous silica powder and the fine particle porous silica powder, so that the different porous silica powder layers are effectively connected through the micropores of the porous fine particle porous silica powder penetrating through the rock wool layer, and the integral bonding strength of the porous silica powder is improved.
The thickness of the coarse particle silicon dioxide porous powder layer in the first-stage heat-insulation unit layer is 10-20 micrometers, the thickness of the fine particle silicon dioxide porous powder layer in the third-stage heat-insulation unit layer is 1-10 micrometers, and the thickness of the mixed particle size silicon dioxide porous powder layer in the second-stage heat-insulation unit layer is 10-20 micrometers. The thickness of the silicon dioxide porous powder layer is designed in consideration of the granularity of the powder and the effect of not damaging the toughness of the powder.
The thickness of the rock wool layer in the heat-preservation middle layer is 10-30 microns, the rock wool layer is composed of rock wool fibers, the surface of the rock wool layer is provided with latticed micropores which are uniformly distributed, the pore diameter of the latticed micropores is 1-10 microns, and the proportion of the area of the micropores to the surface of the rock wool layer is 40% -60%. The porosity of the rock wool layer at the bottom layer is only less than 10%, and the proportion of micropores of the rock wool layer in the heat-preservation middle layer in the rock wool layer is 40% -60%, so that the design corresponds to the corresponding function. For the bottom rock wool layer, the porosity of less than 10 percent can allow a binder solution to fully permeate, the bottom rock wool layer is fully bonded with the surfaces of the oil field storage equipment and the conveying pipeline in the later period, meanwhile, a small part of silica porous powder in the heat preservation middle layer can permeate into the bottom rock wool layer, and the first-stage heat preservation unit layer adopts coarse-particle silica porous powder, so that the silica porous powder cannot easily penetrate through the bottom rock wool layer to be directly contacted with the surfaces of the oil field storage equipment and the conveying pipeline, and the overall bonding strength of the heat preservation material is reduced. Therefore, the firm connection between the bottom rock wool layer and the upper heat-insulation middle layer can be realized. And the proportion of micropores of the rock wool layer in the heat preservation intermediate layer accounts for 40-60% of that of the rock wool layer, so that different porous silica powder layers are connected and separated, the sufficient contact and connection among porous silica powders with different granularities in different heat preservation unit layers are considered, the heat preservation and heat insulation effects of the porous silica powder layers are improved, the toughness of the solidified porous silica powder is improved by utilizing the excellent toughness of rock wool fibers in the rock wool layer, and the thickness of the heat preservation material required by simply repeating and superposing the composite structure as the minimum unit can be realized.
The invention provides a preparation method of a surface corrosion-resistant heat-insulating composite material for oilfield storage equipment and conveying pipelines, which comprises the following specific steps of:
(1) preparing a bottom rock wool layer, namely paving the bottom rock wool layer which is prepared in advance and has the required thickness on the surface of the smooth plastic cloth by adopting rock wool fibers according to the appearance and the size of oil field storage equipment and a conveying pipeline; the smooth plastic cloth can ensure that the rock wool layer at the bottom layer is kept clean before being bonded with the surfaces of oil field storage equipment and conveying pipelines, so that the bonding effect is ensured;
(2) preparing a heat-preservation middle layer, namely preparing the heat-preservation middle layer on the surface of the bottom rock wool layer obtained in the previous step, firstly coating coarse-particle silicon dioxide porous powder uniformly mixed with polyvinyl alcohol hydrosol on the surface of the bottom rock wool layer, then paving a rock wool layer with a microporous structure in the heat-preservation middle layer prepared in advance on the surface of the rock wool layer, and then spraying and brushing a layer of polyvinyl alcohol hydrosol on the surface of the rock wool layer, thereby completing the preparation of a first-stage heat-preservation unit layer; then, sequentially finishing the preparation of a second-stage heat-insulation unit layer and a third-stage heat-insulation unit layer according to the same method, thereby finishing the preparation of a first minimum unit group composite structure, and repeating a plurality of groups according to the requirement to finish the preparation of a heat-insulation intermediate layer, wherein polyvinyl alcohol hydrosol is not sprayed on the surface of the last rock wool layer, and the last epoxy resin organic corrosion-resistant layer is required to be coated on the surface of the last rock wool layer, and water can influence the bonding strength of the epoxy resin;
(3) the method comprises the following steps of (1) bonding the surfaces of oil field storage equipment and a conveying pipeline, firstly, carrying out deoiling and polishing roughening treatment on the surfaces of the oil field storage equipment and the conveying pipeline, then spraying a layer of polyvinyl alcohol hydrosol on the surfaces of the oil field storage equipment and the conveying pipeline by using a high-pressure spray gun, winding the bottom rock wool layer with the heat-insulating middle layer obtained in the previous step on the surfaces of the oil field storage equipment and the conveying pipeline, standing for 24-48 hours to fully volatilize water in the polyvinyl alcohol hydrosol serving as a bonding agent, and completely curing and bonding the bottom layer and the heat-insulating middle layer at the moment, so that the epoxy resin organic corrosion-resistant layer coated later can be firmly bonded with the middle heat;
(4) and (3) preparing an organic corrosion-resistant surface layer, namely spraying an epoxy resin solution on the surface of the heat-insulating intermediate layer obtained in the last step, and determining the spraying thickness of the epoxy resin according to the actual requirements of oil field storage equipment and conveying pipelines so as to finish the preparation of the organic corrosion-resistant surface layer, wherein the corrosion-resistant heat-insulating composite material can be obtained after the epoxy resin surface layer is cured.
The preparation of the corrosion-resistant heat-insulating composite material needs to be carried out on the site of oil field storage equipment and conveying pipelines, and once the polyvinyl alcohol binder is solidified, the binding strength is very high, and great change is difficult to carry out, so that the construction effect is best ensured by one-time construction on the surfaces of the oil field storage equipment and the conveying pipelines.
The water content of the polyvinyl alcohol hydrosol can be correspondingly adjusted according to the requirements of actual conditions of oil field storage equipment and conveying pipelines on site on construction time.
When the porous silicon dioxide powder is mixed with the polyvinyl alcohol hydrosol, a magnetic stirrer is adopted to fully stir at the heating temperature of 96-98 ℃ to ensure that solutes in the polyvinyl alcohol hydrosol are in a fully dissolved state in the whole mixing process, so that the polyvinyl alcohol hydrosol is fully adhered to the surface of the porous silicon dioxide powder, but the stirring time is not more than 30 seconds, so that the porous silicon dioxide powder cannot form large-area agglomeration, after the stirring is finished, the mixed porous silicon dioxide powder and the polyvinyl alcohol hydrosol are quickly filtered through a 2000-mesh metal filter screen, the redundant polyvinyl alcohol hydrosol adhered to the surface of the porous silicon dioxide powder can be removed, the porous silicon dioxide powder with the polyvinyl alcohol hydrosol adhered to the surface is in the environment of 50-80 ℃ in the whole preparation process of the heat preservation middle layer, the porous silicon dioxide powder with the polyvinyl alcohol hydrosol adhered to the surface can be fixed at a specific position and can be adjusted and moved according to the needs.
Compared with the prior art, the surface corrosion-resistant heat-insulating composite material for the oil field storage equipment and the conveying pipeline provided by the invention has the following advantages: firstly, the three functional layers of the bottom layer, the heat preservation middle layer and the organic surface layer bear respective responsibility, and the combination strength, the heat preservation performance and the corrosion resistance performance are considered, wherein the design of the epoxy resin anticorrosive layer can meet the corrosion resistance requirements of oil field storage equipment and conveying pipelines in various environments such as atmosphere, underground and the like. Secondly, the heat preservation effect and the toughness of the heat preservation middle layer are considered, the heat preservation middle layer adopts silicon dioxide porous powder with a nano micropore structure as a main heat preservation component, air molecules are difficult to move freely in the air holes by adopting nano-scale air holes with a porous structure, the heat preservation effect is greatly improved, but the problem of obvious reduction of the toughness can occur when the thickness of the silicon dioxide porous powder is larger, and particularly, a thicker heat preservation and insulation layer is difficult to obtain when only the adhesive and the silicon dioxide porous powder are adopted, so the invention introduces a rock wool layer with excellent heat preservation and fire prevention effects to improve the toughness, and adopts the design of a three-stage heat preservation unit layer structure to ensure that the coarse-granularity and fine-granularity silicon dioxide porous powder realize the obvious improvement of the overall strength and the filling effect through the combination of different particle sizes, particularly, the rock wool layer with, make the toughness on silica powder layer obtain improving, and rock wool layer microporous structure's design makes the silica between the different heat preservation unit layers can realize local interconnect again to make intensity obtain the guarantee, finally at the inside little heat preservation system that forms of a set of composite construction, then superpose as minimum unit group with this group of composite construction, both can realize the separation step by step of temperature conduction, finally realize ideal heat preservation effect. And thirdly, the third-stage heat-insulating unit layer is a fine-particle silicon dioxide porous powder layer/rock wool layer, the design that the proportion of fine-particle silicon dioxide porous powder to coarse-particle silicon dioxide porous powder in the mixed-granularity silicon dioxide porous powder layer is 1: 1-1: 5 is adopted according to the mass percentage, so that the good combination between the third-stage heat-insulating unit layer and the upper-stage heat-insulating unit layer is fully considered, meanwhile, the third-stage heat-insulating unit layer is used as the last-stage heat-insulating unit layer in a group of composite structures, and the fine-particle silicon dioxide porous powder can well fill gaps between the coarse-particle silicon dioxide porous powder, so that the better temperature blocking effect. In addition, because each group of composite structures are repeatedly combined, heat dissipation from the interior of the oil field storage equipment and the conveying pipeline to the outside or heat conduction from the external environment to the oil field storage equipment and the conveying pipeline can be effectively blocked by the unique three-stage heat-insulating unit layer structure, and the inorganic fire-resistant property of the silicon dioxide powder and the fire-resistant property of the rock wool layer ensure that the corrosion-resistant heat-insulating composite material has excellent fire-resistant property.
Drawings
FIG. 1 is a schematic structural diagram of the corrosion-resistant thermal-insulation composite material of the present invention.
FIG. 2 is a schematic diagram of a three-level thermal unit layer of any composite structure of the thermal interlayer of the present invention.
Detailed Description
Referring to fig. 1, the surface corrosion-resistant heat-insulation composite material for the oil field storage equipment and the conveying pipeline comprises a bottom layer 1, a heat-insulation intermediate layer 2 and an organic corrosion-resistant surface layer 3, wherein the bottom layer 1 is directly attached to the outer surfaces of the oil field storage equipment and the conveying pipeline, the heat-insulation intermediate layer 2 is of a multilayer structure, the heat-insulation intermediate layer 2 comprises porous silica powder, rock wool fibers and polyvinyl alcohol, and the organic corrosion-resistant surface layer 3 comprises epoxy resin. The three functional layers of the bottom layer, the heat-preservation middle layer and the organic surface-resistant layer are responsible for each other, and the bonding strength, the heat preservation performance and the corrosion resistance performance are considered.
The bottom layer 1 is a bottom rock wool layer with the thickness of 50-100 microns, the porosity of the bottom rock wool layer is not more than 10%, and polyvinyl alcohol hydrosol is used as a bonding agent to bond the bottom rock wool layer with the surfaces of the oil field storage equipment and the conveying pipeline. The thickness design of 50-100 microns enables polyvinyl alcohol hydrosol to fully permeate, and can effectively separate a small part of silicon dioxide porous powder in gaps of a rock wool layer at the bottom layer, so that direct contact between the silicon dioxide porous powder and the surfaces of oil field storage equipment and conveying pipelines is avoided, and effective adhesion between the whole corrosion-resistant heat-insulation composite material and the surfaces of the oil field storage equipment and the conveying pipelines is ensured.
Referring to fig. 2, the thickness of heat preservation intermediate level 2 is 1~50 millimeters, heat preservation intermediate level 2 uses a set of composite construction to carry out repeated stack as minimum unit group and constitutes, composite construction includes tertiary heat preservation unit layer, and first order heat preservation unit layer is coarse grain silica porous powder layer 21 rock wool layer 20, and third level heat preservation unit layer is fine grain silica porous powder layer 23 rock wool layer 20, and second level heat preservation unit layer is mixed particle size silica porous powder layer 22 rock wool layer 20, adopt the polyvinyl alcohol hydrosol as the binder in the heat preservation intermediate level 2. The rock wool layer 20 is adopted in each of the three-level heat-preservation unit layers, the toughness of the silicon dioxide porous powder layer is obviously improved due to the design, and meanwhile, due to the improvement of the toughness, the multilayer overlapping repeated treatment can be carried out, and finally the heat-preservation middle layer with the required thickness is obtained. The design that adopts tertiary heat preservation cell layer structure then makes coarse grain size and fine grit silica porous powder realize the improvement of bulk strength and filling effect through the combination of different particle sizes, especially adopt the microporous structure rock wool layer of rock wool fibre preparation as the supporter between the silica powder of different granularities, make the toughness on silica powder layer obtain improving, and microporous structure's design makes the silica between the different heat preservation cell layers can realize local interconnect again, thereby make intensity obtain the guarantee, finally at the inside little heat preservation system that forms of a set of composite construction, then stack for minimum unit group with this set of composite construction, can realize the separation step by step of temperature conduction, finally realize ideal heat preservation effect.
The particle size of the porous silicon dioxide powder in the coarse particle porous silicon dioxide powder layer 21 is 1-10 micrometers, the particle size of the porous silicon dioxide powder in the fine particle porous silicon dioxide powder layer 23 is 50-100 nanometers, the proportion of the porous fine particle silicon dioxide powder to the porous coarse particle silicon dioxide powder in the mixed particle porous silicon dioxide powder layer 22 is 1: 1-1: 5 by mass percent, particularly, the optimized proportion of the porous fine particle silicon dioxide powder to the porous coarse particle silicon dioxide powder is 1:4, the pore diameters of the porous coarse particle silicon dioxide powder and the porous fine particle silicon dioxide powder are both 20-40 nanometers, and the pore rate is not lower than 90%. The heat preservation middle layer 2 adopts silicon dioxide porous powder with a nano-microporous structure as a main heat preservation component, and adopts a porous structure with nano-scale air holes to ensure that air molecules are difficult to freely move in the air holes, so that the heat preservation effect is greatly improved.
The thickness of the coarse particle silicon dioxide porous powder layer 21 in the first-stage heat preservation unit layer is 10-20 microns, the thickness of the fine particle silicon dioxide porous powder layer 23 in the third-stage heat preservation unit layer is 1-10 microns, and the thickness of the mixed particle size silicon dioxide porous powder layer 22 in the second-stage heat preservation unit layer is 10-20 microns. The thickness design of the silicon dioxide porous powder layer considers the granularity of the powder and the effect of not damaging the toughness, the heat preservation effect is limited due to the too thin layer thickness, the toughness is obviously reduced due to the too thick layer thickness, and the heat preservation effect is influenced due to the possibility of generating cracks when the stress is too large in the using process.
The thickness of the rock wool layer 20 in the heat preservation middle layer 2 is 10-30 microns, the rock wool layer 20 is composed of rock wool fibers, the surface of the rock wool layer 20 is provided with latticed micropores which are uniformly distributed, the pore diameter of the latticed micropores is 1-10 microns, and the proportion of the micropores in the rock wool layer 20 is 40% -60%. This design makes existing relation and divided again between the porous powder layer of different silica, taken into account abundant contact and connection between the porous powder of different granularity silica, improve its heat preservation thermal-insulated effect, utilize the excellent toughness of rock wool fibre in the rock wool layer simultaneously, improve the toughness of the porous powder of silica, thereby can realize carrying out simple repetition and stack to obtain the insulation material thickness that needs with this composite construction as minimum unit, especially can carry out accurate and convenient thickness adjustment to special part or key position, realize the processing and the preparation in local specific thickness heat preservation intermediate level, thereby satisfy different appearances in the at utmost, the oil field storage equipment of structure and demand and pipeline's heat preservation are thermal-insulated.
A preparation method of the surface corrosion-resistant heat-insulating composite material for the oil field storage equipment and the conveying pipeline comprises the following specific steps:
(1) preparing a bottom rock wool layer, namely paving the bottom rock wool layer which is prepared in advance and has the required thickness on the surface of the smooth plastic cloth by adopting rock wool fibers according to the appearance and the size of oil field storage equipment and a conveying pipeline;
(2) preparing a heat-preservation middle layer, namely preparing the heat-preservation middle layer on the surface of the bottom rock wool layer obtained in the previous step, firstly coating coarse-particle silicon dioxide porous powder uniformly mixed with polyvinyl alcohol hydrosol on the surface of the bottom rock wool layer, then paving a rock wool layer with a microporous structure in the heat-preservation middle layer prepared in advance on the surface of the rock wool layer, and then spraying a layer of polyvinyl alcohol hydrosol on the surface of the rock wool layer by using a high-pressure spray gun so as to finish the preparation of a first-stage heat-preservation unit layer; then, sequentially finishing the preparation of a second-stage heat-insulation unit layer and a third-stage heat-insulation unit layer according to the same method, thereby finishing the preparation of a first minimum unit structure, and repeating multiple groups according to the requirement to finish the preparation of a heat-insulation intermediate layer, wherein polyvinyl alcohol hydrosol is not sprayed on the surface of the last rock wool layer; in the process of coating the porous silicon dioxide powder, the powder is fully mixed with the polyvinyl alcohol hydrosol, the polyvinyl alcohol hydrosol can be fully cured after water in the polyvinyl alcohol hydrosol is volatilized, and the addition proportion of the polyvinyl alcohol is low, so that the heat preservation effect of the heat preservation intermediate layer cannot be greatly influenced;
(3) the method comprises the following steps of (1) bonding the surfaces of oil field storage equipment and a conveying pipeline, firstly, carrying out deoiling and polishing roughening treatment on the surfaces of the oil field storage equipment and the conveying pipeline, then spraying a layer of polyvinyl alcohol hydrosol on the surfaces of the oil field storage equipment and the conveying pipeline, winding the bottom rock wool layer with the heat-insulating middle layer obtained in the previous step on the surfaces of the oil field storage equipment and the conveying pipeline, standing for 24-48 hours to fully volatilize water in the polyvinyl alcohol hydrosol serving as a bonding agent, and at the moment, completely curing and bonding the bottom rock wool layer and the heat-insulating middle layer;
(4) and (3) preparing an organic corrosion-resistant surface layer, namely spraying an epoxy resin solution on the surface of the heat-insulating intermediate layer obtained in the last step, and determining the spraying thickness of the epoxy resin according to the actual requirements of oil field storage equipment and conveying pipelines so as to finish the preparation of the organic corrosion-resistant surface layer, wherein the corrosion-resistant heat-insulating composite material can be obtained after the epoxy resin surface layer is cured.
The preparation of the corrosion-resistant heat-insulating composite material needs to be carried out on the site of oil field storage equipment and conveying pipelines.
The water content of the polyvinyl alcohol hydrosol can be correspondingly adjusted according to the requirements of actual conditions of oil field storage equipment and conveying pipelines on site on construction time.
When the porous silicon dioxide powder is mixed with the polyvinyl alcohol hydrosol, a magnetic stirrer is adopted to fully stir at the heating temperature of 96-98 ℃, the stirring time is not more than 30 seconds, after the stirring is finished, the mixed porous silicon dioxide powder and the polyvinyl alcohol hydrosol are quickly filtered through a 2000-mesh metal filter screen, and the porous silicon dioxide powder with the polyvinyl alcohol hydrosol adhered to the surface is in the environment of 50-80 ℃ in the whole preparation process of the heat-preservation middle layer.
Due to the special design of the corrosion-resistant heat-insulating composite material in the aspects of materials, structures, adhesives and the like, the preparation method can be simply and conveniently implemented on site, and meanwhile, the corresponding adjustment of the construction time can be carried out according to the site conditions and requirements, so that the corrosion-resistant heat-insulating composite material is beneficial to popularization.
Although embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (5)
1. The surface corrosion-resistant heat-insulation composite material for the oil field storage equipment and the conveying pipeline is characterized by comprising a bottom layer, a heat-insulation intermediate layer and an organic corrosion-resistant surface layer, wherein the bottom layer is directly attached to the outer surfaces of the oil field storage equipment and the conveying pipeline, the heat-insulation intermediate layer is of a multilayer structure, the components of the heat-insulation intermediate layer comprise porous silicon dioxide powder, rock wool fibers and polyvinyl alcohol, and the component of the organic corrosion-resistant surface layer is epoxy resin; the bottom layer is a bottom rock wool layer with the thickness of 50-100 microns, the porosity of the bottom rock wool layer is not more than 10%, and the bottom rock wool layer is bonded with the surfaces of the oilfield storage equipment and the conveying pipeline by using polyvinyl alcohol hydrosol as a bonding agent;
the thickness of the heat-preservation middle layer is 1-50 mm, the heat-preservation middle layer is formed by repeatedly overlapping a group of composite structures serving as a minimum unit group, each composite structure comprises three stages of heat-preservation unit layers, the first stage of heat-preservation unit layer is a coarse particle silicon dioxide porous powder layer/rock wool layer, the third stage of heat-preservation unit layer is a fine particle silicon dioxide porous powder layer/rock wool layer, the second stage of heat-preservation unit layer is a mixed particle size silicon dioxide porous powder layer/rock wool layer, and polyvinyl alcohol hydrosol is used as a binder in the heat-preservation middle layer;
the particle size of the silicon dioxide porous powder in the coarse particle silicon dioxide porous powder layer is 1-10 microns, the particle size of the silicon dioxide porous powder in the fine particle silicon dioxide porous powder layer is 50-100 nanometers, the proportion of the fine particle silicon dioxide porous powder to the coarse particle silicon dioxide porous powder in the mixed particle silicon dioxide porous powder layer is 1: 1-1: 5 by mass percent, the pore diameters of the coarse particle silicon dioxide porous powder and the fine particle silicon dioxide porous powder are both 20-40 nanometers, and the porosity is not lower than 90%;
the thickness of the coarse particle silicon dioxide porous powder layer in the first-stage heat-insulation unit layer is 10-20 micrometers, the thickness of the fine particle silicon dioxide porous powder layer in the third-stage heat-insulation unit layer is 1-10 micrometers, and the thickness of the mixed particle size silicon dioxide porous powder layer in the second-stage heat-insulation unit layer is 10-20 micrometers;
the thickness of the rock wool layer in the heat-preservation middle layer is 10-30 microns, the rock wool layer is composed of rock wool fibers, the surface of the rock wool layer is provided with latticed micropores, the pore diameter of the latticed micropores is 1-10 microns, and the proportion of the area of the micropores to the surface of the rock wool layer is 40% -60%.
2. The preparation method of the surface corrosion-resistant heat-insulating composite material for the oilfield storage equipment and the conveying pipeline, which is disclosed by claim 1, comprises the following specific steps:
(1) preparing a bottom rock wool layer, namely paving the bottom rock wool layer with the required thickness prepared in advance on the surface of the smooth plastic cloth by adopting rock wool fibers according to the appearance and the size of oil field storage equipment and a conveying pipeline;
(2) preparing a heat-preservation middle layer, namely preparing the heat-preservation middle layer on the surface of the bottom rock wool layer obtained in the previous step, firstly coating coarse-particle silicon dioxide porous powder uniformly mixed with polyvinyl alcohol hydrosol on the surface of the bottom rock wool layer, then paving a rock wool layer with a microporous structure in the heat-preservation middle layer prepared in advance on the surface of the rock wool layer, and then spraying and brushing a layer of polyvinyl alcohol hydrosol on the surface of the rock wool layer, thereby completing the preparation of a first-stage heat-preservation unit layer; then, sequentially finishing the preparation of a second-stage heat-insulation unit layer and a third-stage heat-insulation unit layer according to the same method, thereby finishing the preparation of a first minimum unit group composite structure, and repeating multiple groups according to the requirement to finish the preparation of a heat-insulation intermediate layer, wherein polyvinyl alcohol hydrosol is not sprayed on the surface of the last rock wool layer;
(3) the method comprises the following steps of (1) bonding the surfaces of oil field storage equipment and a conveying pipeline, firstly, carrying out deoiling and polishing roughening treatment on the surfaces of the oil field storage equipment and the conveying pipeline, then spraying a layer of polyvinyl alcohol hydrosol on the surfaces of the oil field storage equipment and the conveying pipeline by using a high-pressure spray gun, winding the bottom rock wool layer with the heat-insulating middle layer obtained in the previous step on the surfaces of the oil field storage equipment and the conveying pipeline, standing for 24-48 hours to fully volatilize water in the polyvinyl alcohol hydrosol serving as a bonding agent, and at the moment, completely curing and bonding the bottom rock wool layer and the heat-;
(4) and (3) preparing an organic corrosion-resistant surface layer, namely spraying an epoxy resin solution on the surface of the heat-insulating intermediate layer obtained in the last step, and determining the spraying thickness of the epoxy resin according to the actual requirements of the oil field storage equipment and the conveying pipeline so as to finish the preparation of the organic corrosion-resistant surface layer, wherein the corrosion-resistant heat-insulating composite material for the surfaces of the oil field storage equipment and the conveying pipeline can be obtained after the epoxy resin surface layer is cured.
3. The method for preparing the surface corrosion-resistant heat-insulating composite material for the storage equipment and the conveying pipeline in the oil field according to claim 2, wherein the preparation of the corrosion-resistant heat-insulating composite material is carried out on the site of the storage equipment and the conveying pipeline in the oil field.
4. The method for preparing the surface corrosion-resistant heat-insulating composite material for the oil field storage equipment and the conveying pipeline according to claim 2, wherein the water content of the polyvinyl alcohol hydrosol can be correspondingly adjusted according to the actual conditions of the oil field storage equipment and the conveying pipeline on site according to the requirements of construction time.
5. The preparation method of the surface corrosion-resistant heat-preservation composite material for the oil field storage equipment and the conveying pipeline according to claim 2, characterized in that when the porous silica powder is mixed with the polyvinyl alcohol hydrosol, a magnetic stirrer is adopted to fully stir at a heating temperature of 96-98 ℃, the stirring time is not more than 30 seconds, after the stirring is finished, the mixed porous silica powder and the polyvinyl alcohol hydrosol are rapidly filtered through a 2000-mesh metal filter screen, and in the whole preparation process of the heat-preservation middle layer, the porous silica powder with the polyvinyl alcohol hydrosol adhered to the surface is in an environment of 50-80 ℃.
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| CN201910043152.2A CN109707953B (en) | 2019-01-17 | 2019-01-17 | Surface corrosion-resistant heat-insulating composite material for oil field storage equipment and conveying pipeline |
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| CN109707953A CN109707953A (en) | 2019-05-03 |
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