An oil-in-water emulsion type paraffin remover, a preparation method and application thereof

Abstract

The application discloses an oil-in-water emulsion type wax remover and a preparation method and application thereof. The oil-in-water emulsion type wax remover comprises the following components in percentage by mass: 40-50% of an organic solvent; 0.3-0.51% of a surfactant; 5-10% of a mutual solvent; 0.5-1.0% of an alkaline regulator; and the balance of distilled water. The organic solvent comprises kerosene and an aromatic hydrocarbon solvent, and the aromatic hydrocarbon solvent comprises dimethylbenzene and a high-boiling-point aromatic hydrocarbon solvent. The oil-in-water emulsion type wax remover has suitable component formula, good synergy and strong wax removal capacity. The oil-in-water emulsion type wax remover can be used for removing wax deposition in a gas well wellbore and wax deposition in an oil well wellbore, and has the characteristics of fast wax removal rate, safe use, low toxicity and environmental protection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-temperature and high-pressure condensate gas well wax removal agents, and particularly relates to a water-in-oil emulsion type wax removal agent and a preparation method and application thereof. BACKGROUND

[0002] For crude oil with a high wax content, the wax in the produced crude oil will condense and deposit on the surface of the oil pipe with the decrease of temperature and pressure, and the wax deposition phenomenon is more serious, which leads to the decrease of the pipeline transportation capacity and brings many problems to the production process. For high-temperature and high-pressure condensate gas reservoirs, the problems of wax deposition and plugging of the wellbore and surface pipelines often occur, which seriously restricts the normal development of the condensate gas reservoir. For the wax-deposited condensate gas well, the wax removal and prevention measures are difficult, and the commonly used mechanical wax removal, hot washing wax removal, electric heating wax removal and prevention, coating pipe wax removal and prevention, and electromagnetic wax removal and prevention methods all have the problems of complex process, high measure cost, and safety and environmental protection risks. Chemical wax removal and prevention is a widely used wax removal and prevention measure, which has the advantages of good wax removal and prevention effect, simple construction, small risk, low cost and the like, and can simultaneously solve the problems of wax deposition of the wellbore and surface pipelines.

[0003] Chemical wax removal agents include oil-based wax removal agents and water-based wax removal agents. The oil-based wax removal agent has fast wax dissolving speed, low solidification point, strong adaptability to crude oil, and good wax removal effect, but the commonly used organic solvents have small density, low flash point and large toxicity, which greatly limits the application of the oil-based wax removal agent. The water-based wax removal agent has relatively large relative density, is safe to use, and is not easy to ignite, but has slow wax removal speed, poor low-temperature fluidity, and high cost due to high price of the main component surfactant and large use concentration. In recent years, the development of emulsion type wax removal agents makes up for the shortcomings of the above two types of wax removal agents. The emulsion type wax removal agent is formed by adding an organic solvent and a mutual solvent with significant wax removal effect as an inner phase into a water solution with water, a surfactant and an alkaline regulator as an outer phase to form an oil-in-water emulsion. The emulsion type wax removal agent is an emulsion formed by emulsifying the oil-based wax removal agent with good wax removal effect and the water-based wax removal agent with low toxicity by a proper surfactant. The emulsion type wax removal agent is broken before entering the wax deposition well section, and the separated water-based and oil-based wax removal agents simultaneously act on the deposited paraffin on the pipe wall, and the emulsion type wax removal agent has a faster wax dissolving speed than the oil-based and water-based wax removal agents.

[0004] However, the emulsion type wax removal agent needs to ensure the stability during preparation and storage, and must be immediately broken under the current conditions after reaching the wax deposition well section. Therefore, the selection of the surfactant and the breaking temperature need to be strictly controlled, and the conditions during preparation and use are relatively harsh, otherwise the wax removal effect will be greatly affected. In addition, there are many types of wax removal agents used in oilfields at present, but there are few wax removal agent products with safety, environmental protection and high efficiency. SUMMARY

[0005] In order to solve the problems in the prior art, the application provides an oil-in-water emulsion type wax remover, a preparation method and application thereof, the oil-in-water emulsion type wax remover can efficiently remove wax deposition in a wellbore of a gas well, and ensure normal production of a high-temperature and high-pressure condensate gas well, and the oil-in-water emulsion type wax remover is also suitable for wax removal of an oil well wellbore.

[0006] In order to achieve the above-mentioned purpose, the application provides an oil-in-water emulsion type wax remover, the oil-in-water emulsion type wax remover comprises the following components in percentage by mass:

[0007] 40% to 50% of an organic solvent;

[0008] 0.3% to 0.51% of a surfactant;

[0009] 5% to 10% of a mutual solvent;

[0010] 0.5% to 1.0% of an alkaline regulator;

[0011] and the balance is distilled water.

[0012] The organic solvent comprises kerosene and an aromatic hydrocarbon solvent, and the aromatic hydrocarbon solvent comprises dimethylbenzene and a high-boiling-point aromatic hydrocarbon solvent.

[0013] Further, the mass ratio of the kerosene and the aromatic hydrocarbon solvent in the organic solvent is 1:2 to 2:1, and the kerosene is aviation kerosene.

[0014] The aromatic hydrocarbon solvent comprises dimethylbenzene and a high-boiling-point aromatic hydrocarbon solvent S-150, and the mass ratio of dimethylbenzene and the high-boiling-point aromatic hydrocarbon solvent S-150 is 3:2.

[0015] Further, the surfactant comprises alkylphenol polyoxyethylene ether and alkylphenol polyoxyethylene ether sodium sulfate,

[0016] the mass ratio of the alkylphenol polyoxyethylene ether and the alkylphenol polyoxyethylene ether sodium sulfate is 1:3 to 3:1,

[0017] the alkylphenol polyoxyethylene ether comprises at least one of octylphenol polyoxyethylene ether or nonylphenol polyoxyethylene ether.

[0018] Further, the mass ratio of the alkylphenol polyoxyethylene ether and the alkylphenol polyoxyethylene ether sodium sulfate is 2:1.

[0019] the alkylphenol polyoxyethylene ether is a mixture of octylphenol polyoxyethylene ether and nonylphenol polyoxyethylene ether, and the mass ratio of the octylphenol polyoxyethylene ether and the nonylphenol polyoxyethylene ether is 1:1.

[0020] The alkylphenol polyoxyethylene ether sodium sulfate is alkylphenol polyoxyethylene (10) ether sodium sulfate.

[0021] Further, the mutual solvent comprises isopropyl alcohol and diethylene glycol monobutyl ether,

[0022] The mass ratio of isopropyl alcohol and diethylene glycol monobutyl ether is 1:2-2:1.

[0023] Further, the mass ratio of isopropyl alcohol and diethylene glycol monobutyl ether is 1:1.

[0024] The application further provides a preparation method of the oil-in-water emulsion type wax remover.

[0025] 40-50% of the organic solvent, 0.3-0.51% of the surfactant, 5-10% of the mutual solvent, 0.5-1.0% of the alkaline adjusting agent, and the rest of distilled water are weighed according to the mass percentage;

[0026] The organic solvent and the mutual solvent are mixed and stirred to obtain a 1# solution;

[0027] The distilled water, the surfactant and the alkaline adjusting agent are mixed and stirred to obtain a 2# solution;

[0028] The 1# solution and the 2# solution are mixed and stirred to obtain the oil-in-water emulsion type wax remover;

[0029] The organic solvent comprises kerosene and aromatic hydrocarbon solvent, and the aromatic hydrocarbon solvent comprises dimethylbenzene and high-boiling aromatic hydrocarbon solvent.

[0030] Further, the temperature of the mixing and stirring is 40 DEG C.

[0031] Further, the oil-in-water emulsion type wax remover has a flash point of greater than or equal to 46.2 DEG C.

[0032] The application further provides an application of the oil-in-water emulsion type wax remover.

[0033] Further, the oil-in-water emulsion type wax remover is used for wax removal of high-temperature and high-pressure condensate gas well shafts and oil well shafts.

[0034] Compared with the prior art, the application has the following beneficial effects:

[0035] (1) The oil-in-water emulsion type wax remover of the application uses the organic solvent and the mutual solvent with remarkable wax removal effect as the inner phase, and adds them into the surfactant aqueous solution with water, a surfactant and an alkaline adjusting agent as the outer phase to form an oil-in-water emulsion, thereby making up for the deficiencies of the oil-soluble wax remover and the water-soluble wax remover; the oil-in-water emulsion type wax remover is safe to use, has low toxicity, high flash point and large density, and can simultaneously have the characteristics of environmental protection and high efficiency.

[0036] (2) The organic solvent of the oil-in-water emulsion type wax remover of the present application includes aviation kerosene, dimethylbenzene and high-boiling aromatic hydrocarbon solvent S-150; the surfactant includes octylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether and alkylphenol polyoxyethylene (10) ether sodium sulfate; the mutual solvent includes isopropyl alcohol and diethylene glycol monobutyl ether; the components of the oil-in-water emulsion type wax remover of the present application are suitable in formula, good in synergism, strong in wax removal capacity, safe and environmentally friendly at the same time, and can be applied to the wax removal of the wellbore of high-temperature and high-pressure condensate gas well and the wellbore of oil well.

[0037] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by the methods or steps particularly pointed out in the written description and claims hereof. DETAILED DESCRIPTION

[0038] For the oil-in-water emulsion type wax remover, the components usually include organic solvent, surfactant, mutual solvent, alkaline regulator and water. The organic solvent is the main acting component of the oil-in-water emulsion type wax remover, and has good dissolving effect on wax. The surfactant has emulsifying effect on one hand, which is conducive to the formation of oil-in-water emulsion, and has strong penetration and dispersion effect on the other hand, which can reduce the interfacial tension between wax crystals and between the wax crystals and the pipe wall, accelerate the organic solvent to enter the inside of the wax crystals, make the wax crystal structure destroy, and thus improve the wax dissolving rate. The mutual solvent can solve the oil-water mutual solubility problem, make the system become homogenized, improve the stability of the system, and also can increase the solubility of wax in the wax remover, so that the organic solvent can better contact with the wax sample and increase the dissolving rate. The alkaline regulator can reduce the viscosity of the system, the alkaline regulator reacts with the acid groups in the gum and asphaltene in the wax to generate water-soluble substances, so that the wax layer is loose, and the wax removal capacity can be assisted and enhanced. Water is an indispensable component for forming emulsion.

[0039] Although the mechanism of each component of the oil-in-water emulsion type wax remover is relatively clear, the selection of suitable organic solvent, surfactant and mutual solvent plays a decisive role in the properties of the oil-in-water emulsion type wax remover. It is very important to have the oil-in-water emulsion type wax remover which is safe to use, has small toxicity, high flash point and large density, and also has the properties of environmental protection and high efficiency. Therefore, the present application provides an oil-in-water emulsion type wax remover, which is suitable in formula, good in synergism, strong in wax removal capacity, safe and environmentally friendly at the same time.

[0040] The present application will be described in detail below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0041] In the embodiments of the present application, the octylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether and alkylphenol polyoxyethylene (10) ether sodium sulfate are produced by Jiangsu Hai'an Petrochemical Factory, and the other chemical raw materials, aviation kerosene, dimethylbenzene, high-boiling aromatic hydrocarbon solvent S-150, isopropanol, diethylene glycol monobutyl ether and caustic soda NaOH are commercially available chemical products. It should be noted that these raw materials are not used to limit the present application.

[0042] Example 1

[0043] An oil-in-water emulsion type wax remover, the formula components of the wax remover are shown in Table 1.

[0044] Table 1 Formula components of the oil-in-water emulsion type wax remover (mass percentage)

[0045]

[0046] The formula components of the oil-in-water emulsion type wax remover are shown in Table 1, each group of the oil-in-water emulsion type wax remover includes organic solvent, surfactant, mutual solvent, alkaline regulator and distilled water. For example, in group 1, the organic solvent is a mixture of aviation kerosene and aromatic solvent with a mass ratio of 1:1, the aromatic solvent is a mixture of dimethylbenzene and high-boiling aromatic hydrocarbon solvent S-150 with a mass ratio of 3:2; the surfactant is a mixture of octylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether and alkylphenol polyoxyethylene (10) ether sodium sulfate with a mass ratio of 1:1:1; the mutual solvent is a mixture of isopropanol and diethylene glycol monobutyl ether with a mass ratio of 1:1; the alkaline regulator is NaOH; and the distilled water is the balance.

[0047] Example 2

[0048] A preparation method of an oil-in-water emulsion type wax remover, the method comprises,

[0049] The aviation kerosene, dimethylbenzene, high-boiling aromatic hydrocarbon solvent S-150, octylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether, alkylphenol polyoxyethylene (10) ether sodium sulfate, isopropanol, diethylene glycol monobutyl ether, NaOH and distilled water are weighed according to the components of group 1 in Example 1;

[0050] The aviation kerosene, dimethylbenzene, high-boiling aromatic hydrocarbon solvent S-150, isopropanol and diethylene glycol monobutyl ether are added into a reaction kettle respectively for mixing, and 1# solution is obtained by stirring at 40℃;

[0051] The distilled water, octylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether, alkylphenol polyoxyethylene (10) ether sodium sulfate and NaOH are added into another reaction kettle respectively for mixing, and 2# solution is obtained by stirring at 40℃;

[0052] Mixing 1# solution and 2# solution, stirring at 40℃ for 30min, an oil-in-water emulsion type wax remover can be obtained.

[0053] Example 3

[0054] A method for preparing an oil-in-water emulsion type wax remover, the method comprising,

[0055] According to the components in group No. 2 of Example 1, aviation kerosene, xylene, high-boiling aromatic hydrocarbon solvent S-150, surfactant, isopropyl alcohol, diethylene glycol monobutyl ether, NaOH and distilled water are weighed;

[0056] In a reaction kettle, aviation kerosene, xylene, high-boiling aromatic hydrocarbon solvent S-150, isopropyl alcohol and diethylene glycol monobutyl ether are added respectively and mixed, and 1# solution is obtained by stirring at 40℃;

[0057] In another reaction kettle, distilled water, octylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether, alkylphenol polyoxyethylene (10) ether sodium sulfate and NaOH are added respectively and mixed, and 2# solution is obtained by stirring at 40℃;

[0058] Mixing 1# solution and 2# solution, stirring at 40℃ for 30min, an oil-in-water emulsion type wax remover can be obtained.

[0059] Example 4

[0060] A method for preparing an oil-in-water emulsion type wax remover, the method comprising,

[0061] According to the components in group No. 3 of Example 1, aviation kerosene, xylene, high-boiling aromatic hydrocarbon solvent S-150, surfactant, isopropyl alcohol, diethylene glycol monobutyl ether, NaOH and distilled water are weighed;

[0062] In a reaction kettle, aviation kerosene, xylene, high-boiling aromatic hydrocarbon solvent S-150, isopropyl alcohol and diethylene glycol monobutyl ether are added respectively and mixed, and 1# solution is obtained by stirring at 40℃;

[0063] In another reaction kettle, distilled water, octylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether, alkylphenol polyoxyethylene (10) ether sodium sulfate and NaOH are added respectively and mixed, and 2# solution is obtained by stirring at 40℃;

[0064] Mixing 1# solution and 2# solution, stirring at 40℃ for 30min, an oil-in-water emulsion type wax remover can be obtained.

[0065] Example 5

[0066] A method for preparing an oil-in-water emulsion type wax remover, the method comprising,

[0067] The aviation kerosene, xylene, high-boiling aromatic hydrocarbon solvent S-150, surfactant, isopropyl alcohol, diethylene glycol monobutyl ether, NaOH and distilled water were weighed according to the components of group number 4 in example 1;

[0068] The aviation kerosene, xylene, high-boiling aromatic hydrocarbon solvent S-150, isopropyl alcohol and diethylene glycol monobutyl ether were added into a reaction kettle respectively and mixed, and 1# solution was obtained by stirring at 40℃;

[0069] The distilled water, octylphenol polyoxyethylene ether, nonylphenol polyoxyethylene ether, alkylphenol polyoxyethylene (10) ether sodium sulfate and NaOH were added into another reaction kettle respectively and mixed, and 2# solution was obtained by stirring at 40℃;

[0070] The 1# solution and the 2# solution were mixed, and the oil-in-water emulsion type wax remover was obtained by stirring at 40℃ for 30 min.

[0071] Example 6

[0072] In order to detect the performance of the oil-in-water emulsion type wax remover prepared in examples 2-5 of the present application, the wax dissolving rate of the oil-in-water emulsion type wax remover prepared in examples 2-5 of the present application was tested. According to the standard SY / T6300-2009 "Technical conditions for wax removal and prevention agents for oil production", the test temperature was 45℃, and the wax sample used was medical high-efficiency section paraffin with a melting point of 56-58℃. The wax dissolving rate results of the oil-in-water emulsion type wax remover prepared in examples 2-5 are shown in Table 2.

[0073] Table 2 Wax dissolving rate results of the oil-in-water emulsion type wax remover prepared in examples 2-5

[0074] Wax dissolution rate (g / min) Example 2 0.039 Example 3 0.035 Example 4 0.037 Example 5 0.035

[0075] From the test results in Table 2, it can be seen that the wax dissolving rate of the oil-in-water emulsion type wax remover prepared in examples 2-5 of the present application is all ≥0.035g / min, which is much higher than the requirement of 0.016g / min of the wax dissolving rate in the industry standard.

[0076] The wax remover can be divided into class I, class II and class III according to the flash point, wherein the flash point of class I wax remover is >45℃, the flash point of class II wax remover is 28-45℃, and the flash point of class III wax remover is 10-28℃. The class II and class III wax removers have the risk of being flammable and explosive due to the low flash point. The flash point of the wax remover is also an important property. The flash point of the oil-in-water emulsion type wax remover prepared in examples 2-5 of the present application was tested according to the standard GB / T 261-2021 "Determination of flash point - Pensky-Martens closed cup method", and the results are shown in Table 3.

[0077] Table 3 Flash point test results of the oil-in-water emulsion type wax remover prepared in examples 2-5 of the present application

[0078] Flash point (°C) Example 2 46.5 Example 3 46.2 Example 4 47.2 Example 5 46.9

[0079] From the test results of Table 3, it can be seen that the flash points of the oil-in-water emulsion type wax removers prepared in Examples 2-5 of the present application all meet the Class I index requirement of the flash point of the wax remover standard.

[0080] These results show that the oil-in-water emulsion type wax removers prepared in Examples 2-5 of the present application have higher flash points and higher wax removal capacity, and can be applied to the wax removal of the wellbore of the high-temperature and high-pressure condensate gas well and the wellbore of the oil well.

[0081] Comparative Example 1

[0082] The inventors have also made a large number of component formula adjustment tests in actual production practice, and have prepared some other oil-in-water emulsion type wax removers. The specific formula components are shown in Table 4.

[0083] Table 4 Formula components (mass percentage) of other oil-in-water emulsion type wax removers

[0084]

[0085] Comparative Examples 2-9

[0086] According to the components of Groups 5-12 given in Comparative Example 1, each raw material was weighed, and the oil-in-water emulsion type wax removers of Comparative Examples 2-9 were prepared by referring to the preparation method of the oil-in-water emulsion type wax remover in Example 2.

[0087] Test and Analysis Example

[0088] Although the mechanism of each component of the oil-in-water emulsion type wax remover is relatively clear when the oil-in-water emulsion type wax remover is applied to wax removal, the selection of the appropriate organic solvent, surfactant and mutual solvent plays a decisive role in the wax removal performance of the oil-in-water emulsion type wax remover. The stability of the wax remover directly affects the use of the wax remover in downhole operations, and low stability can result in the wax remover being unable to be used; if the components are adjusted so that the wax removal performance of the wax remover is significantly reduced, the application value of the prepared wax remover is also lower. Taking Examples 2 and Comparative Examples 2-9 as examples, the stability and wax dissolving rate of the prepared oil-in-water emulsion type wax remover were tested. The stability and wax dissolving effect of the oil-in-water emulsion type wax remover of Examples 2 and Comparative Examples 2-9 are shown in Table 5. Among them, the stability of the oil-in-water emulsion type wax remover was tested according to the “Emulsion Stability Test Method” of the People’s Republic of China Petroleum and Chemical Industry Standard SH / T 0579-1994; the wax dissolving rate test was the same as the method in Example 6, which is not described again.

[0089] The stability and wax dissolving effect of the oil-in-water emulsion type wax remover of Examples 2 and Comparative Examples 2-9 are shown in Table 5

[0090]

[0091] In combination with the test results of Table 5 and the respective formulation components given in Table 4 of Comparative Example 1, it can be seen that Comparative Example 2, which lacks sodium alkylphenol polyoxyethylene (10) ether sulfate, and Comparative Example 3, which lacks both octylphenol polyoxyethylene ether and nonylphenol polyoxyethylene ether, are both unstable and cannot be used for wax removal. Comparative Example 4 and Comparative Example 5, which lack isopropyl alcohol and diethylene glycol monobutyl ether, respectively, are relatively stable. Among the groups with wax removal data, Comparative Example 6, which lacks NaOH, has the lowest wax removal rate, because NaOH can reduce the viscosity of the system, can react with the acidic groups of the gum and asphaltene in the wax to form water-soluble substances, and can loosen the wax layer, thereby assisting the other formulation components of the wax remover. Comparative Examples 7-9 lack aviation kerosene, xylene, and high-boiling aromatic hydrocarbon solvent S-150, respectively, relative to the formulation components of Example 2. The wax removal rates of Comparative Examples 2-9 are all less than or equal to 0.027 g / min, which is much lower than the 0.039 g / min of Example 2. These results show that the components of the oil-in-water emulsion type wax remover of Example 2 have good compatibility and high stability, and the components have good synergistic effects when used for wax removal.

[0092] In summary, the oil-in-water emulsion type wax remover prepared in the examples of the present application has suitable formulations, good synergistic effects, and strong wax removal ability, and is safe and environmentally friendly, and has good application prospects.

[0093] Finally, it should be noted that the above description is only for the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will still be able to modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included within the scope of protection of the present application.

Claims

1. An oil-in-water emulsion type paraffin remover, characterized by, The oil-in-water emulsion type wax remover comprises the following components by mass percentage: 40%-50% organic solvent; 0.3%-0.51% surfactant; 5%-10% mutual solvent; 0.5%-1.0% alkaline regulator; the balance is distilled water; The organic solvent is composed of kerosene and aromatic hydrocarbon solvent, and the aromatic hydrocarbon solvent is a mixture of xylene and high-boiling aromatic hydrocarbon solvent S-150; The surfactant is composed of alkyl phenol polyoxyethylene ether and sodium alkyl phenol polyoxyethylene (10) ether sulfate, and the alkyl phenol polyoxyethylene ether is a mixture of octyl phenol polyoxyethylene ether and nonyl phenol polyoxyethylene ether alkyl phenol polyoxyethylene ether; The mutual solvent is a mixture of isopropyl alcohol and diethylene glycol monobutyl ether; The alkaline regulator is NaOH.

2. The oil-in-water emulsion type wax remover according to claim 1, characterized by, The mass ratio of kerosene and aromatic hydrocarbon solvent in the organic solvent is 1:2-2:1, and the kerosene is aviation kerosene; the mass ratio of xylene and high-boiling aromatic hydrocarbon solvent S-150 is 3:

2.

3. The oil-in-water emulsion type rust preventative according to claim 1, characterized by, The mass ratio of alkyl phenol polyoxyethylene ether and sodium alkyl phenol polyoxyethylene (10) ether sulfate is 1:3-3:

1.

4. The oil-in-water emulsion type rust preventative according to claim 1, characterized by, The mass ratio of alkyl phenol polyoxyethylene ether and sodium alkyl phenol polyoxyethylene (10) ether sulfate is 2:1; the mass ratio of octyl phenol polyoxyethylene ether and nonyl phenol polyoxyethylene ether is 1:

1.

5. The oil-in-water emulsion type rust preventative according to claim 1, characterized by, The mass ratio of isopropyl alcohol and diethylene glycol monobutyl ether is 1:2-2:

1.

6. The oil-in-water emulsion type wax remover according to claim 5, characterized by, The mass ratio of isopropyl alcohol and diethylene glycol monobutyl ether is 1:

1.

7. A process for the preparation of the oil-in-water emulsion type paraffin remover as claimed in any one of claims 1 to 6, characterized in that, The method comprises: 40%-50% organic solvent, 0.3%-0.51% surfactant, 5%-10% mutual solvent, 0.5%-1.0% alkaline regulator, and the balance is distilled water; Mix and stir the organic solvent and the mutual solvent to obtain 1# solution; Mix and stir the distilled water, the surfactant and the alkaline regulator to obtain 2# solution; Mix and stir 1# solution and 2# solution to obtain the oil-in-water emulsion type wax remover.

8. The method of claim 7, wherein, The temperature of mixing and stirring is 40°C.

9. The method of claim 7, wherein, The oil-in-water emulsion type wax remover has a flash point of ≥46.2°C.

10. Use of an oil-in-water emulsion-type paraffin remover as claimed in any one of claims 1 to 6, characterized in that The oil-in-water emulsion type wax remover is used for wax removal of high-temperature and high-pressure condensate gas well wellbore and oil well wellbore.

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