Intelligent nanometer single-phase fluid for removing and inhibiting complex scale and preparation method thereof

Abstract

The application discloses an intelligent nano single-phase fluid for removing and inhibiting complex scale and a preparation method thereof. The intelligent nano single-phase fluid comprises the following components in the following contents: 16wt%-36wt% of an organic solvent, 3wt%-11wt% of acid, 16wt%-36wt% of a surfactant, 16wt%-36wt% of a cosurfactant, 100ppm-1000ppm of a wax inhibitor, 400ppm-1200ppm of an asphalt inhibitor, 0.01wt%-0.08wt% of an inorganic scale inhibitor, and the rest of water. The system provided by the application has certain inhibiting effect on organic scale (such as wax and asphaltene) and inorganic scale, can effectively prevent the formation of wax crystal, asphaltene and inorganic scale, and hinder the accumulation of the wax crystal, asphaltene and inorganic scale, thereby prolonging the scale removal period; and the system also has good removal effect on organic scale such as wax and asphaltene and inorganic scale.

Description

Technical Field

[0001] This invention relates to the field of reservoir development technology, specifically to a smart nano-single-phase fluid for removing and inhibiting complex scale and its preparation method. Background Technology

[0002] Scaling in oil and gas field production systems has always been a significant issue affecting production and development efficiency. As temperature and pressure decrease, inorganic scale often mixes and precipitates with waxes and asphaltenes, making scale prevention and treatment very difficult. Organic unblocking fluids are typically used to unblock organic scale, while inorganic acids are used to unblock inorganic blockages. Therefore, when facing damage to the reservoir caused by complex mixed scale, it is necessary to inject multiple treatment agents alternately. However, multi-stage injection treatments involve long cleaning times and large fluid volumes, potentially impacting economic efficiency. Furthermore, when treating organic or inorganic scale alone, injecting a single-function treatment fluid may push untouchable deposits deeper into the reservoir, increasing the difficulty of subsequent unblocking.

[0003] CN 112079455 A discloses an oilfield chemical scale inhibitor, which uses sodium polyepoxysuccinate, chelating dispersants, and nitrogen-containing organic polyphosphonic acids in a specific ratio as its main raw material components. The components work synergistically to cause almost no corrosion to pipelines, are non-toxic, have good temperature resistance, minimal environmental impact, and are safe to use. It helps prevent scale formation after injection water mixes with oil reservoir water, achieving a scale prevention rate of over 90% for calcium carbonate scale and over 90% for barium sulfate scale. However, this technology lacks scale removal capabilities and is only effective against inorganic scale.

[0004] CN 115612470 A discloses an acid pickling descaling agent and its preparation method. The raw materials include mixed acid, scale inhibitor, corrosion inhibitor and water. It solves the problem of well sticking and pump leakage caused by scale in oil wells in the field. It makes up for the inability of conventional hot washing to effectively treat scale sticking and pump leakage caused by scale. However, it cannot remove the deposition of organic scale such as wax and asphalt, nor can it inhibit the formation of complex scale.

[0005] CN 114316935 A discloses a microlactic acid unblocking system. The raw materials for its preparation include a biodegradable surfactant, organic acid, surface-modifying agent, co-solvent, plant-based organic solvent, ion modifier, surface conditioner, complexing agent, and water. This microlactic acid unblocking system features a slow reaction rate, strong dissolving ability, and environmental friendliness, and exhibits good unblocking effects on both inorganic and organic matter blockages in formations. However, this technology cannot inhibit the formation of organic scale such as wax and asphaltene, as well as inorganic scale.

[0006] While the above-mentioned descaling and scale-inhibiting solutions have some effect on removing and inhibiting scale, they cannot be carried out simultaneously, and the overall effect is limited. Summary of the Invention

[0007] The purpose of this invention is to provide a smart nano-single-phase fluid for removing and inhibiting complex scale, as well as its preparation and application.

[0008] The system provided by this invention can inhibit organic scale (such as wax and asphalt) and inorganic scale to a certain extent, effectively preventing the formation of wax crystals, asphalt and inorganic scale, and hindering the accumulation of wax crystals, asphalt and inorganic scale, thereby increasing the descaling cycle; it can also remove organic scale such as wax and asphalt and inorganic scale effectively.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] This invention provides a smart nano-single-phase fluid for removing and inhibiting complex scale, wherein the smart nano-single-phase fluid comprises the following components in varying amounts:

[0011] Organic solvents 16wt%–36wt%, acids 3wt%–11wt%, surfactants 16wt%–36wt%, co-surfactants 16wt%–36wt%, wax inhibitors 100ppm–1000ppm, asphalt inhibitors 400ppm–1200ppm, inorganic scale inhibitors 0.01wt%–0.08wt%, the remainder being water.

[0012] Due to the unique structure of single-phase microemulsions, two immiscible liquids can form a stable single-phase structure. Oil-in-acid microemulsions, in particular, can encapsulate the acid liquid with an organic solvent, forming a single-phase liquid system, potentially offering a one-step solution to clogging problems caused by mixed scale. Simultaneously, selected and compatible wax and asphalt inhibitors are added to the oil phase to inhibit the formation of wax and asphaltenes, respectively, while compatible inorganic scale inhibitors are added to the acid liquid to inhibit the formation of inorganic scale. It is important to note that the addition of organic and inorganic scale inhibitors will alter the phase state of the microemulsion, requiring careful selection of raw materials and adjustment of the component ratios.

[0013] In the intelligent nano-single-phase fluid of the present invention, preferably, the organic solvent is an aromatic hydrocarbon solution, wherein the aromatic hydrocarbon solution is selected from at least one of toluene, xylene, and heavy aromatic hydrocarbon oils. The organic solvent selected in this invention has a better effect on removing organic scale.

[0014] According to the intelligent nano-single-phase fluid of the present invention, preferably, the acid is a mixture of hydrochloric acid and hydrofluoric acid; the mass ratio of the hydrochloric acid and hydrofluoric acid is (5-15):1, preferably (9-12):1.

[0015] A mixture of HCl and HF has a good effect on removing inorganic scale, and the combined use within the specified concentration range yields the best results.

[0016] In the intelligent nano-single-phase fluid of the present invention, preferably, the surfactant is an alkyl alcohol polyoxyethylene ether surfactant. This surfactant and its content ratio readily form a clear and transparent single-phase fluid within the system of the present invention. More preferably, the alkyl alcohol polyoxyethylene ether surfactant is selected from tridecyl alcohol polyoxyethylene ether and pentadecyl alcohol polyoxyethylene ether. Even more preferably, the number of polyoxyethylene polymers in the alkyl alcohol polyoxyethylene ether surfactant is 3 to 10.

[0017] In the intelligent nano-single-phase fluid of the present invention, preferably, the co-surfactant is an alcohol; more preferably, the alcohol is ethanol and / or isopropanol. In the intelligent nano-single-phase fluid of the present invention, the co-surfactant works better when used in combination with the surfactant.

[0018] In the intelligent nano-single-phase fluid of the present invention, preferably, the wax inhibitor is a polymer, specifically ethylene vinyl acetate (EVA) and / or ethylene acrylate (EAA). The wax inhibitor of the present invention has been verified to effectively inhibit the formation of wax crystals.

[0019] According to the intelligent nano-single-phase fluid of the present invention, preferably, the asphalt inhibitor is one or more of dodecylbenzenesulfonic acid and / or Span-80 solution.

[0020] Dodecylbenzenesulfonic acid is a strong acid that significantly acidifies asphaltenes, giving them a positive charge; the negatively charged sulfonate group can form a strong electrostatic interaction with asphaltenes. Furthermore, benzenesulfonic acid contains a benzene ring, which can also generate π-π interactions with asphaltenes. Therefore, dodecylbenzenesulfonic acid has a very strong asphaltenes-inhibiting effect. SPAN-80 is a nonionic oil-soluble surfactant with a relatively large molecular size, which can generate strong van der Waals interactions with asphaltenes and also has good asphaltenes-inhibiting ability.

[0021] In the intelligent nano-single-phase fluid of the present invention, preferably, the inorganic scale inhibitor is an organophosphonic acid; more preferably, the inorganic scale inhibitor is hydroxyethylidene diphosphonic acid and / or sodium ethylenediaminetetramethylenephosphonate.

[0022] The inorganic scale inhibitor of the present invention can inhibit the formation of inorganic scale crystals. After adding the inorganic scale inhibitor to the system, its effect on the formation of inorganic scale crystals can be observed by scanning electron microscopy.

[0023] Another aspect of the present invention provides a method for preparing the above-mentioned intelligent nano-single-phase fluids, wherein the preparation method includes the following steps:

[0024] An aqueous solution of mixed acid, asphalt inhibitor, and inorganic scale inhibitor are mixed and heated to 60-70°C. Then, a surfactant and a co-surfactant are added while stirring. After the mixture is fully dissolved, an organic solvent and a wax inhibitor are added. The mixture is stirred and mixed evenly to obtain the transparent intelligent nano-single-phase fluid.

[0025] This invention configures an organic solvent and an acid solution into a microlactic acid single-phase system, which has strong thermodynamic stability and a nanostructure. It can achieve the miscibility of organic solvent and acid solution and simultaneously remove mixed scale blockages and release scale-inhibiting components, achieving multiple effects with one agent and saving a lot of costs. Attached Figure Description

[0026] Figure 1 This is a particle size distribution diagram of the intelligent nano-single-phase fluid prepared in Example 1 after acidification reaction.

[0027] Figure 2 This is a particle size distribution diagram of the intelligent nano-single-phase fluid prepared in Example 1 after acidification reaction.

[0028] Figure 3 This is a particle size distribution diagram of the intelligent nano-single-phase fluid prepared in Example 1 after acidification reaction.

[0029] Figure 4 This is a particle size distribution diagram of the intelligent nano-single-phase fluid prepared in Example 1 after acidification reaction. Detailed Implementation

[0030] To more clearly illustrate the present invention, the following description, in conjunction with preferred embodiments, further clarifies the invention. Those skilled in the art should understand that the specific descriptions below are illustrative rather than restrictive, and should not be construed as limiting the scope of protection of the present invention.

[0031] All numerical specifications in this invention (e.g., temperature, time, concentration, and weight, including ranges for each) are generally approximate values ​​that may be changed (+) or (-) in increments of 0.1 or 1.0. All numerical specifications are to be understood as being preceded by the term "about".

[0032] Example 1

[0033] This embodiment prepares approximately 100g of a smart nano-single-phase fluid, including the following steps:

[0034] 28g of HCl+HF solution (26g of 37% HCl + 2g of 40% HF), 400ppm of dodecylbenzenesulfonic acid, and 0.06g of hydroxyethylidene diphosphonic acid were added to a 500mL plastic beaker and heated to 60-70℃ in a 60℃ water bath. 20g of tridecyl alcohol polyoxyethylene ether surfactant and 26g of ethanol co-surfactant were added with stirring. After complete dissolution, 26g of xylene and 400ppm of ethylene acrylic acid (EAA) were added and stirred for 1h to obtain a transparent intelligent nano-single-phase fluid.

[0035] Example 2

[0036] This embodiment prepares approximately 100g of a smart nano-single-phase fluid, including the following steps:

[0037] 22g of HCl+HF solution (20g of 37% HCl + 2g of 40% HF), 800ppm of dodecylbenzenesulfonic acid, and 0.08g of hydroxyethylidene diphosphonic acid were added to a 500mL plastic beaker and heated to 60-70℃ in a 60℃ water bath. 26g of pentadecyl alcohol polyoxyethylene ether surfactant and 26g of ethanol co-surfactant were added with stirring. After complete dissolution, 26g of xylene and 600ppm of ethylene acrylic acid (EAA) were added and stirred for 1h to obtain a transparent intelligent nano-single-phase fluid.

[0038] Example 3

[0039] This embodiment prepares approximately 100g of a smart nano-single-phase fluid, including the following steps:

[0040] 22g of HCl+HF solution (20g of 37% HCl + 2g of 40% HF), 400ppm of Span-80, and 0.06g of sodium ethylenediaminetetramethylenephosphonate were added to a 500mL plastic beaker and heated to 60-70℃ in a 60℃ water bath. 26g of tridecanol polyoxyethylene ether surfactant and 26g of isopropanol co-surfactant were added with stirring. After complete dissolution, 26g of toluene and 400ppm of ethylene-vinyl acetate (EVA) were added and stirred for 1h to obtain a transparent intelligent nano-single-phase fluid.

[0041] Example 4

[0042] This embodiment prepares approximately 100g of a smart nano-single-phase fluid, including the following steps:

[0043] 28g of HCl+HF solution (26g of 37% HCl + 2g of 40% HF), 800ppm of Span-80, and 0.08g of sodium ethylenediaminetetramethylenephosphonate were added to a 500mL plastic beaker and heated to 60-70℃ in a 60℃ water bath. 20g of pentadecyl alcohol polyoxyethylene ether surfactant and 26g of isopropanol co-surfactant were added with stirring. After complete dissolution, 26g of toluene and 600ppm of ethylene-vinyl acetate (EVA) were added and stirred for 1h to obtain a transparent intelligent nano-single-phase fluid.

[0044] Test Example 1

[0045] Particle size distribution test:

[0046] Microemulsions are generally considered to have a particle size range of 10–100 nm. To fully understand the liquid state of this single-phase fluid before and after the acidification reaction, microscopic analysis is necessary. The Zetasizer Nano ZS laser nanoparticle size analyzer was used for testing, and the results are as follows: Figures 1-4 And as shown in Table 1.

[0047] Table 1. Results of Particle Size Test

[0048]

[0049] The single-phase fluid prepared by this invention has a relatively uniform particle size distribution in its initial state, exhibiting a microemulsion state with a particle size at the nanometer level; as the acid-rock reaction proceeds, the microemulsion core transforms from hydrochloric acid to Ca. 2+ It contains saline solution, but does not disrupt the microemulsion structure, maintaining the nanoparticle size range.

[0050] Test Example 2

[0051] Dissolving power test for mixed scale:

[0052] The experimental mixed scale sample consisted of a mixture of inorganic scale of calcium carbonate and ferric hydroxide, and national standard 10# asphalt. To minimize the impact of surface area on dissolution efficiency, the three types of scale were mixed in equal proportions to prepare 2g of mixed scale, which was then thoroughly mixed and pressed into balls. The above four examples were used to conduct experiments on dissolving the mixed scale, with hydrochloric acid and xylene as controls. The experimental conditions were a 90℃ water bath for 4 hours, followed by filtration and drying for 24 hours after the reaction. The mass after the reaction was measured to obtain the dissolution rate of the mixed scale. The reaction amount and dissolution rate were calculated by weighing before and after the reaction, and the results are shown in Table 2.

[0053]

[0054] In the formula, R is the solubility, dimensionless; m1 and m2 are the mass of the mixed scale before and after the reaction (both were dried at 105℃ for 24 hours before weighing), in g.

[0055] Table 2. Experimental results of dissolving mixed scale with 6 different solvents.

[0056] Solution Mass before dissolution / g Dissolved mass / g Dissolved mass / g Dissolution efficiency / % hydrochloric acid 2.0894 2.0324 0.0570 2.73 xylene 2.1142 1.0632 1.0510 49.69 Example 1 2.0149 0.0552 1.9597 97.26 Example 2 2.0926 0.0360 2.0566 98.28 Example 3 2.0835 0.0382 2.0453 98.17 Example 4 2.0726 0.0458 2.0268 97.79

[0057] Table 2 shows the maximum dissolution capacity of the six unblocking solutions and mixed scale within 4 hours. Hydrochloric acid showed the lowest dissolution capacity because the calcium carbonate and ferric hydroxide in the mixed scale sample were almost completely encapsulated by asphalt, preventing hydrochloric acid from reacting with them and thus making dissolution difficult. Xylene, an organic solvent, only dissolves asphaltene; the encapsulated inorganic scale particles dispersed in the liquid cannot dissolve, resulting in an overall dissolution efficiency of only 49.69%. This fluid effectively dissolves both inorganic and organic scale, thus achieving the highest dissolution efficiency for mixed scale, reaching over 97% – almost complete dissolution.

[0058] Test Example 3

[0059] Wax resistance test:

[0060] a. Number the four test tubes and weigh the empty test tubes using an electronic balance.

[0061] b. Measure 10 mL of the prepared experimental oil (containing 13.7 wt% wax) into a test tube using a graduated cylinder.

[0062] c. Measure 10 mL of wax inhibitor from each of the four experimental samples using a graduated cylinder and place them into four separate test tubes.

[0063] d. Place the four test tubes in an 80℃ constant temperature water bath and heat for 30 minutes until the wax inhibitor is completely dissolved.

[0064] e. Place all four test tubes in a water bath (3°C below the wax precipitation point) for 5 minutes.

[0065] f. Remove the four test tubes from the water bath, tilt the tubes downwards at a 30° angle, and let them stand for 30 seconds to allow the liquid to flow out.

[0066] g. Weigh the four test tubes with deposited wax using an electronic balance; calculate the wax resistance rate of the condensate oil in different experimental cases, and the results are shown in Table 3.

[0067] Calculate the wax resistance rate using the following formula:

[0068]

[0069] In the formula:

[0070] f - Wax resistance rate, %;

[0071] m0 - Mass of empty test tube, g;

[0072] m1 - the mass of the test tube containing condensate oil, in grams;

[0073] m2 - the mass of the test tube with wax deposit, in grams.

[0074] Table 3 Results of wax resistance test

[0075] Experimental Example test tube weight / g Test tube + wax weight / g Weight of precipitated wax / g Wax resistance rate / % Example 1 15.8341 16.2280 0.3939 72.1 Example 2 14.5773 15.0374 0.4601 67.4 Example 3 14.7581 15.4880 0.7299 48.2 Example 4 14.2732 14.9538 0.6806 51.7

[0076] As shown in Table 3, the two polymers, ethylene-vinyl acetate (EVA) and ethylene-acrylic acid (EAA), have non-polar carbon-carbon backbones, which have strong interactions with non-polar waxes. They also contain a large number of polar side chains, which can disrupt the crystallization of the system and have a good wax inhibition rate.

[0077] Test Example 4

[0078] Inorganic scale inhibition capacity test:

[0079] (1) Effect on the scale inhibition effect of calcium sulfate scale:

[0080] ① Prepare three solutions:

[0081] Solution A: C NaCl =7.5g / L+C CaCl2·H2O =11.1 g / L;

[0082] Solution B: C NaCl =7.5g / L+C Na2SO4 =10.66g / L;

[0083] Solution C: C 阻垢剂 =0.5% (volume percentage), and the scale inhibitors are listed in Table 4.

[0084] ② After mixing solutions A, B, and C in a certain proportion, the following three samples were obtained:

[0085] Sample 1: 50 mL A + 50 mL B + 0.8 mL C;

[0086] Sample 2: 50 mL A + 50 mL B;

[0087] Sample 3: 50 mL A + 50 mL distilled water.

[0088] ③ Place samples 1, 2, and 3 in a water bath and heat for 24 hours at a temperature of 30°C.

[0089] ④ Filter the solutions from the three samples using medium-speed filter paper, then take 2 mL of each of the three samples, dilute them 50 times with distilled water, and add an appropriate amount of 0.1% NaOH solution to adjust the pH to between 12 and 13.

[0090] ⑤ Then add a small amount of calcium indicator (calcium indicator: grind 0.5g of calcium carboxylic acid and 50g of sodium chloride dried at 105℃ in a mortar, pass through a 40-50 mesh sieve, and store in a brown ground glass bottle) to make the solution system appear light red.

[0091] ⑥ Titrate with 0.01 mol / L EDTA, and use the color change from red to blue as the standard for titration;

[0092] Then, the scale inhibition rate is tested using the following formula:

[0093]

[0094] In the formula:

[0095] E f —Scale inhibition rate, %;

[0096] V0 — The volume of EDTA consumed by the blank solution (sample 2), in mL;

[0097] V — The volume of EDTA consumed by the sample 3 solution, in mL;

[0098] V1 — The volume of EDTA consumed by adding scale inhibitor solution (sample 1), in mL.

[0099] (2) Effect on the scale inhibition effect of calcium carbonate scale:

[0100] Prepare three solutions:

[0101] Solution A: C NaCl =33.00g / L+C CaCl2·H2O =12.15g / L+C MgCl2·6H2O =3.68g / L;

[0102] Solution B: C NaCl =33.00g / L+C Na2SO4 =0.03g / L+C NaHCO3 =7.38g / L;

[0103] Solution C: C 阻垢剂 =0.5% (volume percentage), and the scale inhibitors are listed in Table 4.

[0104] The test method for scale inhibition rate is the same as that for calcium sulfate scale.

[0105] The experimental results are shown in Table 4.

[0106] Table 4. Results of scale prevention experiment

[0107] scale inhibitor Calcium sulfate scale prevention rate / % Calcium carbonate scale prevention rate / % Commercially available scale inhibitors 91.8 92.3 Single-phase fluid in Experiment Example 1 98.35 97.67 Single-phase fluid in Experiment Example 2 97.24 98.24 Single-phase fluid in Experiment Example 3 97.56 97.68 Single-phase fluid in Experiment Example 4 98.91 97.36

[0108] As shown in Table 4, the single-phase fluid of the present invention has unique scale inhibition properties, and has a high-efficiency scale inhibition effect on substances such as CaCO3 and CaSO4 in inorganic scale, which is comparable to or better than the high-efficiency scale inhibitors sold on the market.

[0109] Test Example 5

[0110] Asphalt-resistant performance test:

[0111] Asphalt was dissolved in xylene solution to prepare xylene-asphalt solutions of different concentrations. After centrifugation, the absorbance at 670 nm was measured using a UV-Vis spectrophotometer, and a standard curve was fitted.

[0112] Equal volumes of xylene-asphalt mother liquor were prepared and added to four prepared example solutions. These solutions were then diluted with 70% n-heptane-xylene solution (until the asphalt concentration was the same) and thoroughly mixed. The amount of asphalt precipitation was measured using a spectrophotometer, and the asphalt inhibition rate (R) was calculated to screen for the optimal asphalt inhibitor and its concentration.

[0113] The formula for the asphalt inhibition rate is:

[0114] R = (C0 - C) / C0

[0115] R—Asphalt inhibition rate;

[0116] C0 — Concentration of asphaltenes after deposition due to the addition of n-heptane, in ppm;

[0117] C—Concentration of asphaltenes after deposition caused by the addition of the inhibitor n-heptane, in ppm.

[0118] Table 5. Experimental results of asphaltene inhibition rate

[0119] Inhibitors Asphaltene inhibition rate / % Single-phase fluid in Experiment Example 1 96.68 Single-phase fluid in Experiment Example 2 95.89 Single-phase fluid in Experiment Example 3 96.13 Single-phase fluid in Experiment Example 4 95.36

[0120] As shown in Table 5, the single-phase fluid of the present invention has a good inhibitory effect on asphaltene, and the inhibitory effect on asphaltene is obvious.

[0121] For the unidirectional fluid of the present invention, the amount of each raw material used in its preparation process achieves the above-mentioned similar effects within the range defined above, and the present invention will not list them one by one here.

[0122] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. For those skilled in the art, other variations or modifications can be made based on the above description. It is impossible to exhaustively list all the implementation methods here. All obvious variations or modifications derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims

1. A nanoscale single-phase fluid for removing and inhibiting complex scale, wherein, The nano-single-phase fluid comprises the following components in varying amounts: Organic solvents 16wt%~36wt%, acids 3wt%~11wt%, surfactants 16wt%~36wt%, co-surfactants 16wt%~36wt%, wax inhibitors 100ppm~1000ppm, asphalt inhibitors 400ppm~1200ppm, inorganic scale inhibitors 0.01wt%~0.08wt%, the remainder being water; The organic solvent is an aromatic hydrocarbon solution; The acid is a mixture of hydrochloric acid and hydrofluoric acid; the mass ratio of the hydrochloric acid to the hydrofluoric acid is (5~15):1; The surfactant is an alkyl alcohol polyoxyethylene ether surfactant; The co-surfactant is an alcohol, specifically ethanol and / or isopropanol; The wax inhibitor is ethylene-vinyl acetate and / or ethylene acrylic acid; The asphalt inhibitor is one or more of dodecylbenzenesulfonic acid and / or Span-80 solution; The inorganic scale inhibitor is hydroxyethylidene diphosphonic acid and / or sodium ethylenediaminetetramethylidene phosphonate.

2. The nanoscale single-phase fluid according to claim 1, wherein, The organic solvent is selected from at least one of toluene, xylene, and heavy aromatic oils.

3. The nanoscale single-phase fluid according to claim 1, wherein, The alkyl alcohol polyoxyethylene ether surfactant is selected from tridecyl alcohol polyoxyethylene ether and pentadecyl alcohol polyoxyethylene ether.

4. A method for preparing a nanoscale single-phase fluid according to any one of claims 1-3, wherein, The preparation method includes the following steps: An aqueous solution of mixed acid, asphalt inhibitor, and inorganic scale inhibitor are mixed and heated to 60-70°C. Then, a surfactant and a co-surfactant are added while stirring. After the mixture is fully dissolved, an organic solvent and a wax inhibitor are added. The mixture is stirred and mixed evenly to obtain the transparent nano-single-phase fluid.

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