Protective film material for floral tube of brine well, preparation method of protective film material and floral tube of brine well

Abstract

The invention provides a brine well floral tube protective film material, a preparation method thereof and a brine well floral tube. The protective film material for the floral tube of the brine well comprises a fluorine-containing polymer, a sulfonic acid group-containing polymer and an additive, and does not contain metal elements. The protective film material for the floral tube of the brine extraction well, which contains the fluorine-containing polymer, the sulfonic acid group-containing polymer and the additive and does not contain metal elements, can effectively prevent salt in brine from crystallizing on the surface of the floral tube and remarkably avoid the salt deposition phenomenon, so that the brine extraction efficiency is improved, and the maintenance cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of chemical engineering, and in particular to a protective film material for a brine well flower pipe, a preparation method thereof, and a brine well flower pipe. Background Art

[0002] In the production process of salt lakes, collecting brine in brine wells is an important technical link. Underground brine in salt lakes appears as highly mineralized, supersaturated salt water in a static environment. Therefore, during the well mining process, the brine will quickly crystallize due to the flow. In addition, the composition of brine at different depths and in different areas of the brine well is also different. During mining, brine of different components will be mixed and will quickly crystallize due to the addition of brine. When the crystals accumulate on the well wall and brine mining equipment, they will block the brine channel and cause salt to form on the brine pump and the wall of the brine well flower pipe. In particular, the above-mentioned crystals attached to the pipe wall mainly include potassium chloride, sodium chloride, and magnesium chloride. In addition, there may be solid particles such as mud and sand, which will seriously affect brine mining and normal production, and may also cause damage to brine mining equipment.

[0003] At present, the solution to the problem of salt accumulation in production is mainly to remove the brine pump from the well and then clean the salt accumulation area, or to set up a water pipe in the well to add fresh water to the well to dilute the brine to prevent salt accumulation. However, this method cannot completely solve the problem, and the pump still needs to be manually processed in the end. More specifically, for the problem of salt accumulation on the wall of the flower pipe in the brine mining well, the existing method is usually to pre-bury fresh water pipes, use fresh water pipes to inject fresh water into the crystallization area, and then use fresh water to wash and dissolve the crystals. However, after a long period of operation, the salt formation dissolves, causing the foundation to be unstable and the well wall to collapse and fall off easily. At the same time, when fresh water is used to wash the salt, the infiltration of fresh water into the well wall will further affect the salt layer geology around the well, and ultimately increase the speed of well wall collapse and fall off, and even cause the well platform to collapse, which will not only seriously affect normal production, but also cause safety accidents, causing serious losses to the company.

[0004] Based on this, how to provide a membrane material that can protect the brine well flower pipes and effectively inhibit the salt accumulation on the pipe walls is one of the important technical problems that need to be solved in this field. Summary of the invention

[0005] The main purpose of the present invention is to provide a brine well flower pipe protective film material, a preparation method thereof and a brine well flower pipe, so as to solve the problem of serious salt accumulation in the brine well flower pipe in the prior art.

[0006] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides a protective film material for brine well flower pipes, which includes a fluorine-containing polymer, a sulfonic acid group-containing polymer and an additive, and the protective film material for brine well flower pipes does not contain metal elements.

[0007] Furthermore, the weight ratio of the fluorine-containing polymer to the sulfonic acid group-containing polymer is (1-2):1, preferably (4-5):3.

[0008] Furthermore, the ratio of the total weight of the fluorine-containing polymer and the sulfonic acid group-containing polymer to the weight of the additive is (2-4):1.

[0009] Furthermore, the fluorine-containing polymer is selected from one or more of polytetrafluoroethylene, polyvinylidene fluoride and fluorinated ethylene propylene; and / or the sulfonic acid group-containing polymer is polystyrene sulfonic acid and / or sulfonated polyetheretherketone; and / or the additive is a water-soluble polymer, preferably polyethylene glycol and / or polyvinyl propionamide.

[0010] Further, the protective film material of the brine well flower pipe includes 5 parts of polyvinylidene fluoride, 3 parts of polystyrene sulfonic acid and 2 parts of polyethylene glycol, by weight; or, the protective film material of the brine well flower pipe includes 4 parts of polytetrafluoroethylene, 3 parts of sulfonated polyetheretherketone and 3 parts of polyacrylamide, by weight; or, the protective film material of the brine well flower pipe includes 8 parts of fluorinated ethylene propylene, 6 parts of sulfonated polyetheretherketone and 7 parts of polyethylene glycol.

[0011] Furthermore, the thickness of the protective film material of the brine well flower pipe is 300μm to 1000μm.

[0012] The second aspect of the present invention provides a method for preparing the above-mentioned brine well flower pipe protective film material, comprising: step S1, mixing a fluorine-containing polymer, a sulfonic acid group-containing polymer and an additive to obtain a mixed material; step S2, adding the mixed material to a solvent, mixing to obtain a mixed solution; step S3, coating, drying and curing the mixed solution to obtain the brine well flower pipe protective film material.

[0013] Furthermore, the solvent is dimethyl sulfoxide and / or N,N-dimethylformamide.

[0014] Furthermore, the mixing is carried out at 15°C to 30°C, and the mixing method is stirring; preferably, the stirring speed is 100rpm to 2000rpm, and the stirring time is 15min to 60min.

[0015] The third aspect of the present invention provides a brine well flower pipe, comprising an outer pipe and an inner pipe nested inside the outer pipe, wherein at least one layer of the above-mentioned brine well flower pipe protective film material is independently arranged on the inner wall, the outer wall of the inner pipe and the inner wall of the outer pipe.

[0016] By applying the technical solution of the present invention, a protective film material for brine well flower pipes is designed which includes fluorine-containing polymers, sulfonic acid group-containing polymers and additives and does not contain metal elements. This material can effectively prevent the salt in the brine from crystallizing on the surface of the flower pipes and significantly avoid the occurrence of salt formation, thereby improving the brine extraction efficiency and reducing maintenance costs. DETAILED DESCRIPTION

[0017] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below in conjunction with the embodiments.

[0018] As described in the background technology, the existing brine well flower pipe has a serious problem of salt deposition. In order to solve the above technical problems, the first aspect of the present invention provides a brine well flower pipe protective film material, which includes a fluorine-containing polymer, a sulfonic acid group-containing polymer and an additive, and the brine well flower pipe protective film material does not contain metal elements.

[0019] The brine well flower pipe protective film material provided by the present invention, which contains fluorine-containing polymers, sulfonic acid group-containing polymers and additives and does not contain metal elements, can significantly inhibit the salt formation phenomenon on the surface of the brine well flower pipe. Specifically, the fluorine-containing polymer in the membrane material has the characteristics of acid and alkali resistance and resistance to various organic solvents, is almost insoluble in all solvents, has good mechanical properties and chemical stability, and can play an effective protective role as a matrix. The sulfonic acid group-containing polymer can form a proton conduction channel in the membrane, improve the proton conduction performance of the membrane, ensure the smooth transmission of ions in the brine in the membrane, and even further improve the brine extraction efficiency. The additive can further enhance the effect of preventing salt crystallization, thereby producing a more significant inhibitory effect on the salt formation phenomenon on the surface of the brine well flower pipe. In addition, the above-mentioned brine well flower pipe protective film material provided by the present invention also has good mechanical properties and chemical stability, can withstand various environmental conditions in the brine extraction process, ensure long-term and stable use effects, and at the same time is low-cost, easy to obtain, and can achieve industrial production.

[0020] It should be emphasized that there is a synergistic effect between the above-mentioned fluorine-containing polymers, sulfonic acid group-containing polymers and additives, rather than a simple combination relationship. Specifically, fluorine-containing polymers are obtained by homopolymerization or copolymerization of fluorine-containing monomers. Due to the extremely short CF bond and extremely high bond energy, fluorine-containing polymers have unique performance advantages compared to general polymers. The fluorine-carbon bond with extremely high bond energy gives the polymer main chain skeleton stability. Fluorine-containing polymers generally have good weather resistance. In addition, they have chemical corrosion resistance, oxidation resistance and low hygroscopicity; the addition of sulfonic acid group-containing polymers enhances the overall water solubility, making the three more soluble in organic solvents after mixing; additives make the anti-salting performance more prominent. In particular, when the membrane material formed in this way is used as an anti-salting protective material for the flower pipes used in brine wells, based on the special environment of the brine well flower pipes, which are easy to salt, highly corrosive and highly mineralized, the anti-salt crystallization additives in the membrane material structure can cooperate with the above two to enhance the anti-salt crystallization performance of the membrane material, thereby inhibiting the salting of the flower pipes and ultimately achieving the anti-salting effect.

[0021] In addition, the above-mentioned brine well flower pipe protective film material provided by the present invention does not contain any metal elements. This is because during the application of the brine well flower pipe, the metal elements will interact with fluorine-containing polymers, etc., thereby deteriorating the surface properties of the polymer and ultimately weakening the anti-salting effect of the brine well flower pipe.

[0022] In several preferred embodiments, based on the synergistic relationship between the above-mentioned fluorine-containing polymer and the sulfonic acid group-containing polymer, the weight ratio of the fluorine-containing polymer to the sulfonic acid group-containing polymer is (1-2): 1. On this basis, in order to further improve the compatibility between the two, obtain a more uniform protective film material as a whole, thereby more significantly exerting the synergistic effect of the two, and ultimately improving the anti-salting effect of the obtained film material, the inventors have preferably selected the content ratio as (4-5): 3 after a large number of experiments.

[0023] In order to maximize the role of the additive in the above-mentioned polymer matrix and effectively enhance its reinforcing effect on the anti-salting performance of the membrane material, while comprehensively considering the application cost, the preferred ratio of the total weight of the fluorine-containing polymer and the sulfonic acid group-containing polymer to the weight of the additive is (2 to 4):1.

[0024] Furthermore, the fluorine-containing polymer is selected from one or more of polytetrafluoroethylene, polyvinylidene fluoride and fluorinated ethylene propylene; and / or, the sulfonic acid group-containing polymer is polystyrene sulfonic acid and / or sulfonated polyetheretherketone; and / or, the additive is a water-soluble polymer, preferably polyethylene glycol and / or polyvinyl amide. Theoretically, both fluorine-containing polymers and sulfonic acid group-containing polymers can be selected from the types commonly used in the art, and the additives can also be conventionally selected based on the principle of anti-salt crystallization. However, regarding the above-mentioned protective film material provided by the present invention, which is particularly designed for brine well flower pipes, the inventors have screened the types of fluorine-containing polymers, sulfonic acid group-containing polymers and additives through a large number of experiments and comparisons to obtain the above specific types, and found that the components of the above types are more suitable for the scene conditions of the brine wells used for brine well flower pipes, and the coordination and cooperation between them are also higher, and finally show more significant anti-salting performance.

[0025] In several preferred embodiments, the fluorine-containing polymer is a composition formed by polytetrafluoroethylene and polyvinylidene fluoride, and the weight ratio of polytetrafluoroethylene to polyvinylidene fluoride is 1: (1.5-2.0). The two fluorine-containing polymers are compounded and used according to this weight relationship, which can more effectively and comprehensively utilize the chemical corrosion resistance of polytetrafluoroethylene and the excellent mechanical properties of polyvinylidene fluoride. At the same time, the composition formed by the two can also be better compatible with the sulfonic acid group-containing polymer, and finally obtain a brine well flower pipe protective film material with stronger salt resistance.

[0026] In several more preferred embodiments, the protective film material of the brine well flower pipe includes 5 parts of polyvinylidene fluoride, 3 parts of polystyrene sulfonic acid and 2 parts of polyethylene glycol by weight; or, by weight, the protective film material of the brine well flower pipe includes 4 parts of polytetrafluoroethylene, 3 parts of sulfonated polyetheretherketone and 3 parts of polyacrylamide; or, by weight, the protective film material of the brine well flower pipe includes 8 parts of fluorinated ethylene propylene, 6 parts of sulfonated polyetheretherketone and 7 parts of polyethylene glycol. On the basis of the specific material types listed above, the inventors further conducted a large number of experiments to design and screen the compatibility of fluorine-containing polymers, sulfonic acid group-containing polymers and additives, and obtained these specific schemes. At this time, the obtained brine well flower pipe protective film material has better anti-salting performance, is more stable, and has a longer service life. In particular, when the brine well flower pipe protective film material includes 2 parts of polyvinylidene fluoride, 3 parts of polytetrafluoroethylene, 3 parts of polystyrene sulfonic acid and 2 parts of polyethylene glycol, the obtained brine well flower pipe protective film material exhibits particularly significant anti-salting function after film formation.

[0027] In order to optimize the mechanical properties of the obtained membrane material, the inventors further adjusted the thickness of the brine well flower pipe protective membrane material, and after a large number of experiments, it was preferably 300 μm to 1000 μm.

[0028] The second aspect of the present invention provides a method for preparing the above-mentioned brine mining well flower pipe protective film material, comprising: ： Step S1, mixing a fluorine-containing polymer, a sulfonic acid group-containing polymer and an additive to obtain a mixed material; Step S2, adding the mixed material into a solvent, mixing to obtain a mixed solution; Step S3, coating, drying and curing the mixed solution to obtain a brine well flower pipe protective film material.

[0029] For the above-mentioned protective film material for the flower pipes of the brine mining well, the present invention provides a preparation method accordingly, wherein solid materials such as fluorine-containing polymers, sulfonic acid group-containing polymers and additives are first mixed, and then a solution is formed and coated and solidified, which can ensure that the prepared solution to be coated has higher dispersibility, thereby obtaining a protective film material for the flower pipes of the brine mining well with high stability, uniformity and continuity. At the same time, the above-mentioned method provided by the present invention is simple, and a protective film material with anti-salting function can be prepared only through simple coating and post-treatment processes, which is easy to realize industrial production.

[0030] In several typical embodiments, in order to improve the uniformity of the obtained solution, based on the relationship between the polarity and solubility of each component, the inventors preferably select the solvent from one or more of dimethyl sulfoxide and N,N-dimethylformamide after a large number of experiments.

[0031] Furthermore, in order to make the dispersion more uniform, the mixing is carried out at 15°C to 30°C, and the mixing method is stirring. More preferably, the stirring speed is 100rpm to 2000rpm, and the time is 15min to 60min, so as to obtain a solution system with higher dispersion uniformity, thereby further improving the anti-salting protective effect of the obtained brine well flower pipe protective film material.

[0032] The third aspect of the present invention provides a brine well flower pipe, which includes an outer pipe and an inner pipe nested inside the outer pipe, and the inner wall of the inner pipe, the outer wall of the inner pipe, and the inner wall of the outer pipe are each independently provided with at least one layer of the above-mentioned brine well flower pipe protective film material. In view of the anti-corrosion and anti-salting properties of the brine well flower pipe in the application scenario, the brine well flower pipe provided by the present invention with at least one layer of the above-mentioned brine well flower pipe protective film material has a lower salting rate during use and a longer service life.

[0033] Furthermore, in order to achieve a more significant effect of inhibiting salt deposition and comprehensively coordinate the mechanical properties, it is preferred that two layers of the above-mentioned brine well flower pipe protective film material are stacked in sequence on the inner wall, outer wall, and inner wall of the inner tube, that is, the first brine well flower pipe protective film material is respectively arranged on the inner wall, outer wall, and inner wall of the outer tube, and the second brine well flower pipe protective film material is respectively arranged on the surface of the first brine well flower pipe protective film material away from the above-mentioned tube wall. At the same time, in order to coordinate the mechanical properties of the two layers of protective film materials and improve the overall service life of the brine well flower pipe, it is preferred that the thickness ratio of the first layer of salt crystallization prevention film to the second layer of salt crystallization prevention film is (2 to 2.5):1.

[0034] The present application is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed in the present application.

[0035] Unless otherwise defined, all professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0036] Example 1

[0037] Preparation of a brine well flower pipe comprising a brine well flower pipe protective film material:

[0038] Step S1: Select polyvinylidene fluoride as a fluorine-containing high molecular polymer matrix, add polystyrene sulfonic acid, a proton conductive material containing a sulfonic acid group, and polyethylene glycol, an anti-salt crystallization additive, and mix them in a mass ratio of 5:3:2 to obtain a mixed material.

[0039] Step S2: dissolving the above-mentioned mixed material in dimethyl sulfoxide solvent (during dissolution, the weight ratio of the mixed material to the solvent is 1:5), stirring at 15° C. and 2000 rpm for 15 minutes to form a uniform mixed solution.

[0040] Step S3: providing a brine well flower pipe, which includes an outer tube and an inner tube nested inside the outer tube, and coating the obtained mixed solution on the inner wall, outer wall and inner wall of the inner tube of the brine well flower pipe, and forming a salt crystallization-proof film with a thickness of 300 μm on the above three tube walls through drying, curing and other steps.

[0041] Example 2

[0042] Preparation of a brine well flower pipe comprising a brine well flower pipe protective film material:

[0043] Step S1: polytetrafluoroethylene is selected as a fluorine-containing high molecular polymer matrix, sulfonated polyetheretherketone containing a sulfonic acid group as a proton conductive material and polyacrylamide as a salt crystallization prevention additive are added, and the mixture is mixed in a mass ratio of 4:3:3 to obtain a mixed material.

[0044] Step S2: dissolving the above-mentioned mixed material in N,N-dimethylformamide solvent (during dissolution, the weight ratio of the mixed material to the solvent is 1:4), and stirring at 30° C. and 100 rpm for 60 min to form a uniform mixed solution.

[0045] Step S3: providing a brine well flower pipe, which includes an outer tube and an inner tube nested inside the outer tube, and coating the obtained mixed solution on the inner wall, outer wall and inner wall of the inner tube of the brine well flower pipe, respectively, and forming a salt crystallization-proof film with a thickness of 1000 μm on the above three tube walls through drying, curing and other steps.

[0046] Example 3

[0047] Preparation of a brine well flower pipe comprising a brine well flower pipe protective film material:

[0048] The only difference between this embodiment and embodiment 1 is that the fluorine-containing high molecular polymer matrix is ​​changed to fluorinated ethylene propylene, the added proton conductive material containing sulfonic acid groups is changed to sulfonated polyetheretherketone, and the mass ratio of fluorinated ethylene propylene, sulfonated polyetheretherketone and additive polyethylene glycol is 8:6:7.

[0049] Example 4

[0050] Preparation of a brine well flower pipe comprising a brine well flower pipe protective film material:

[0051] The only difference between this embodiment and embodiment 1 is that in step S1, the mass ratio of polyvinylidene fluoride, polystyrene sulfonic acid and polyethylene glycol is changed to 4:4:2, that is, the weight ratio of the fluorine-containing polymer to the sulfonic acid group-containing polymer is changed to 1:1.

[0052] Example 5

[0053] Preparation of a brine well flower pipe comprising a brine well flower pipe protective film material:

[0054] The only difference between this embodiment and embodiment 1 is that in step S1, the mass ratio of polyvinylidene fluoride, polystyrene sulfonic acid and polyethylene glycol is changed to 5.4:2.7:2, that is, the weight ratio of the fluorine-containing polymer to the sulfonic acid group-containing polymer is changed to 2:1.

[0055] Example 6

[0056] Preparation of a brine well flower pipe comprising a brine well flower pipe protective film material:

[0057] The only difference between this embodiment and embodiment 1 is that in step S1, the mass ratio of polyvinylidene fluoride, polystyrene sulfonic acid and polyethylene glycol is changed to 5:3:8, that is, the ratio of the total weight of the fluorine-containing polymer and the sulfonic acid group-containing polymer to the weight of the additive is changed to 1:1.

[0058] Example 7

[0059] Preparation of a brine well flower pipe comprising a brine well flower pipe protective film material:

[0060] The only difference between this embodiment and embodiment 1 is that in step S1, the mass ratio of polyvinylidene fluoride, polystyrene sulfonic acid and polyethylene glycol is changed to 5:3:1.6, that is, the ratio of the total weight of the fluorine-containing polymer and the sulfonic acid group-containing polymer to the weight of the additive is changed to 5:1.

[0061] Example 8

[0062] Preparation of a brine well flower pipe comprising a brine well flower pipe protective film material:

[0063] The only difference between this embodiment and embodiment 1 is that polytetrafluoroethylene is further added in step S1, and the mass ratio of polyvinylidene fluoride, polytetrafluoroethylene, polystyrene sulfonic acid and polyethylene glycol is 3:2:3:2.

[0064] Example 9

[0065] Preparation of a brine well flower pipe comprising a brine well flower pipe protective film material:

[0066] The only difference between this embodiment and embodiment 1 is that in step S3, after the first layer of salt-proof crystallization film is formed on each tube wall, the coating-drying-curing steps are repeated, and a second layer of salt-proof crystallization film is formed on each first layer of salt-proof crystallization film, the total thickness of the two layers is 600 μm, and the ratio of the thickness of the first layer of salt-proof crystallization film to the second layer of salt-proof crystallization film is 2:1.

[0067] Example 10

[0068] Preparation of a brine well flower pipe comprising a brine well flower pipe protective film material:

[0069] The difference between this embodiment and embodiment 1 is only the stirring condition of step S2, specifically: stirring at 40°C and 50 rpm for 5 minutes.

[0070] Under this stirring condition, polyvinylidene fluoride, polystyrene sulfonic acid and polyethylene glycol cannot be well compatible and form a uniform solution. Therefore, the anti-salt crystallization film formed after subsequent coating-drying-curing has an uneven microstructure, poor salt resistance, and is easy to peel off.

[0071] Embodiment 11

[0072] Preparation of a brine well flower pipe comprising a brine well flower pipe protective film material:

[0073] The only difference between this embodiment and embodiment 1 is that the thickness of the salt crystallization-proof film formed after coating-drying-curing is changed to 100 μm.

[0074] Example 12

[0075] Preparation of a brine well flower pipe comprising a brine well flower pipe protective film material:

[0076] The only difference between this embodiment and embodiment 1 is that the thickness of the salt crystallization-proof film formed after coating-drying-curing is changed to 3000 μm.

[0077] Comparative Example 1

[0078] Preparation of a brine well flower pipe comprising a brine well flower pipe protective film material:

[0079] Step S1: polystyrene sulfonic acid is coated on the inner wall, outer wall and inner wall of the inner tube of the brine well flower pipe by dip coating, and a first coating with a thickness of 150 μm is formed respectively.

[0080] Step S2: prepare polyvinylidene fluoride into an emulsion with a mass concentration of 20wt.%, and then apply the emulsion on the formed first coating, and form three second coatings with a thickness of 150μm respectively, so as to obtain a brine well flower pipe containing a brine well flower pipe protective film material.

[0081] That is, the difference between this comparative example and Example 1 is only that the fluorine-containing polymer and the sulfonic acid group-containing polymer are used to form the protective film material layers respectively, and no additive is introduced.

[0082] At this time, the bonding between the two coatings is poor. Although they can play a certain role in resisting salt deposition in the initial stage of use, peeling and falling off between the two coatings will occur during subsequent applications. While the protective effect disappears, it is also very easy to cause material failure of the flower tube itself, and it has no practical application value.

[0083] Comparative Example 2

[0084] Preparation of a brine well flower pipe comprising a brine well flower pipe protective film material:

[0085] The only difference between this comparative example and Example 1 is that in step S1 , an equal weight of sodium fluoride is used to replace polyvinylidene fluoride.

[0086] Comparative Example 3

[0087] Preparation of a brine well flower pipe comprising a brine well flower pipe protective film material:

[0088] The only difference between this comparative example and Example 1 is that in step S1, an equal weight of sodium dodecylbenzene sulfonate is used to replace polystyrene sulfonic acid.

[0089] Comparative Example 4

[0090] Preparation of a brine well flower pipe comprising a brine well flower pipe protective film material:

[0091] The difference between this comparative example and Example 1 is that in step S1, based on the total weight of polyvinylidene fluoride, polystyrene sulfonic acid and polyethylene glycol being 100%, 0.01% of nano-aluminum oxide is added to form a mixed material with the above three.

[0092] Test Method

[0093] It should be noted in advance that in the process of performance test and evaluation of the present invention, the evaluation environment used, that is, the main components of the test brine are shown in the following table:

[0094] Element KCl NaCl <![CDATA[MgCl2]]> <![CDATA[MgSO4]]> <![CDATA[CaSO4]]> Content (wt.%) 1.27 6.77 17.83 1.83 0.07

[0095] The specific test evaluation method is:

[0096] In an inert gas environment, take a brine well flower pipe sample with an area of ​​50mm×50mm that is not coated with any membrane material (record its initial weight as M0) and place it in a 1000mL beaker, and add 500mL of the above-mentioned test brine. After heating the test system in the beaker to 40°C, cool it to room temperature (25±2)°C, and let it stand at this temperature for 7 days. After 7 days, take out the brine well flower pipe sample, on which salt crystals have been attached, and record the weight at this time as Mc. Cut a brine well flower pipe sample of the same size and equipped with a protective film material to be tested (record its initial weight as M1), perform the above test under the same conditions, and record the weight after 7 days as Mt. It can be obtained from this:

[0097]

[0098] The above test was performed on the brine well flower pipe samples containing the brine well flower pipe protective film material obtained in each embodiment and comparative example, and the obtained anti-salting rate results are shown in Table 1.

[0099] Table 1

[0100]

[0101]

[0102] From the above description, it can be seen that the above embodiment of the present invention effectively suppresses the salt accumulation phenomenon on the pipe wall by arranging a protective membrane material on the inner pipe wall of the brine mining well flower pipe.

[0103] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those described herein, for example.

[0104] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A protective film material for brine well flower pipes, characterized in that: The protective film material of the brine well flower pipe comprises a fluorine-containing polymer, a sulfonic acid group-containing polymer and an additive, and the protective film material of the brine well flower pipe does not contain any metal elements.

2. The protective film material for brine well flower pipe according to claim 1, characterized in that: The weight ratio of the fluorine-containing polymer to the sulfonic acid group-containing polymer is (1-2):1, preferably (4-5):

3.

3. The protective film material for brine well flower pipe according to claim 1 or 2, characterized in that: The ratio of the total weight of the fluorine-containing polymer and the sulfonic acid group-containing polymer to the weight of the additive is (2-4):

1.

4. The protective film material for brine well flower pipe according to any one of claims 1 to 3, characterized in that: The fluorine-containing polymer is selected from one or more of polytetrafluoroethylene, polyvinylidene fluoride and ethylene propylene fluoride; and / or, The sulfonic acid group-containing polymer is polystyrene sulfonic acid and / or sulfonated polyetheretherketone; and / or, The additive is a water-soluble polymer, preferably polyethylene glycol and / or polyvinyl acetate.

5. The protective film material for brine well flower pipe according to any one of claims 1 to 4, characterized in that: In parts by weight, the brine well flower pipe protective film material includes 5 parts of polyvinylidene fluoride, 3 parts of polystyrene sulfonic acid and 2 parts of polyethylene glycol; or, In parts by weight, the brine well flower pipe protective film material includes 4 parts of polytetrafluoroethylene, 3 parts of sulfonated polyetheretherketone and 3 parts of polyacrylamide; or, In parts by weight, the brine well flower pipe protective film material includes 8 parts of fluorinated ethylene propylene, 6 parts of sulfonated polyetheretherketone and 7 parts of polyethylene glycol.

6. The protective film material for brine well flower pipe according to any one of claims 1 to 5, characterized in that: The thickness of the brine mining well flower pipe protective film material is 300 μm to 1000 μm.

7. A method for preparing the protective film material for brine well flower pipes according to any one of claims 1 to 6, characterized in that: The preparation method comprises: Step S1, mixing the fluorine-containing polymer, the sulfonic acid group-containing polymer and the additive to obtain a mixed material; Step S2, adding the mixed material into a solvent, and mixing to obtain a mixed solution; Step S3, the mixed solution is coated, dried and cured to obtain the brine well flower pipe protective film material.

8. The preparation method according to claim 7, characterized in that: The solvent is dimethyl sulfoxide and / or N,N-dimethylformamide.

9. The preparation method according to claim 7 or 8, characterized in that: The mixing is carried out at 15°C to 30°C, and the mixing method is stirring; Preferably, the stirring speed is 100 rpm to 2000 rpm, and the stirring time is 15 min to 60 min.

10. A brine mining well flower pipe, comprising an outer pipe and an inner pipe nested inside the outer pipe, characterized in that: At least one layer of the brine well flower pipe protective film material according to any one of claims 1 to 6 is independently arranged on the inner wall, the outer wall of the inner pipe, and the inner wall of the outer pipe.

Images