Oil-based-semi-water-based oil product pipeline cleaning agent as well as preparation method and application thereof

Abstract

The invention relates to the technical field of waste oil product pipeline cleaning, in particular to an oil-based-semi-water-based oil product pipeline cleaning agent as well as a preparation method and application thereof. The cleaning agent comprises an oil-based component and a semi-water-based component, the oil-based component comprises butyl cellosolve, methyl phenetole and solvent oil, and the semi-water-based component comprises butyl cellosolve, triethanolamine, sodium dodecyl benzene sulfonate, polyoxyethylene sorbitan monostearate, polypropylene glycol and water. The cleaning agent has good wax dissolving efficiency, and can be used for thoroughly cleaning waste oil pipelines with serious wax precipitation and compact wax layers; the paint does not contain dangerous components and toxic components, is non-corrosive and low in volatility, and has a good environment-friendly effect; the waste oil pipeline can be reused, safety accidents and environmental pollution accidents caused by waste pipeline disposal are avoided, and therefore economic losses of enterprises are effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of waste oil pipeline cleaning, and in particular to an oil-based / semi-water-based oil pipeline cleaning agent, a preparation method and application thereof. Background Art

[0002] Whether the disposal method of waste oil pipelines is direct demolition or on-site disposal, the pipeline residues should be cleaned first to avoid environmental pollution and safety accidents caused by the residues. For the residue cleaning of long-distance oil pipelines, combined cleaning (pipe cleaning device + chemical cleaning agent) is currently recognized as the best solution. Combined cleaning has high requirements for the safety and environmental protection performance indicators of the cleaning agent and must have a good dissolution rate and wax dissolving ability to ensure that the residual medium and pollutants on the inner wall of the pipeline are thoroughly cleaned, meet the requirements of no oil, no wax, zero flammable gas concentration in the abandoned pipeline, avoid environmental pollution, and meet the national ecological environment. Due to the difference in the quality of domestic and foreign pipeline oil products, the wax deposition of foreign oil pipelines is generally lighter. In addition, the pipeline will be immediately cleaned with solvents once or more after the pipeline is stopped. For some waxed oil pipelines, foreign abandoned pipeline cleaning usually uses liquid hydrocarbon solvents (such as diesel, gasoline or concentrated liquid) as cleaning agents, so related cleaning agent products are not applicable to domestic abandoned pipeline cleaning. Domestic oil products have a high wax content, especially Daqing oil and Shenbei oil. Therefore, the inner wall of the oil pipeline is seriously waxed, the oil wax layer is dense, and the cleaning agent is less effective. In addition, the use of hazardous organic components or strong alkalis makes the cleaning agents more toxic, more volatile, more corrosive, with poor oil dissolving ability and low flash point. The use of such cleaning agents does not meet the quality requirements for waste pipeline cleaning and has very large safety and environmental risks.

[0003] Pipeline cleaning is a major measure to eliminate safety and environmental hazards of waste oil pipelines. At present, there are more than 4,000 kilometers of waste oil pipelines in China that need to be cleaned. About 3 tons of cleaning agent are needed to clean each kilometer of pipeline. Therefore, there is an urgent need for a safe, environmentally friendly and efficient waste oil pipeline cleaning agent that is suitable for pipelines with severe wax deposition and dense oil wax layer. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an oil-based-semi-water-based oil pipeline cleaning agent, a preparation method and an application thereof, so as to solve the problems of poor cleaning effect and great damage to human body and environment of the cleaning agents in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] The invention provides an oil-based-semi-water-based oil pipeline cleaning agent, comprising an oil-based component and a semi-water-based component, wherein the oil-based component comprises ethylene glycol butyl ether, methyl phenyl ether and solvent oil, and the semi-water-based component comprises ethylene glycol butyl ether, triethanolamine, sodium dodecylbenzene sulfonate, polyoxyethylene sorbitan monostearate, polypropylene glycol and water.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, in the oil-based component, the mass percentages of the various components are: 10-15% of ethylene glycol butyl ether, 5%-15% of methyl phenethyl ether, and the remainder is the solvent oil.

[0009] Furthermore, in the semi-aqueous component, the mass percentages of the components are: 1% to 2% of ethylene glycol butyl ether, 1% to 2% of triethanolamine, 1% to 2% of sodium dodecylbenzene sulfonate, 1% to 2% of polyoxyethylene sorbitan monostearate, 1% to 2% of polypropylene glycol, and the balance is water.

[0010] Furthermore, in the oil-based component, the mass percentage of each component is: 10% of ethylene glycol butyl ether, 10% of methyl phenethyl ether, and 80% of the solvent oil; in the semi-aqueous component, the mass percentage of each component is: 1.5% of ethylene glycol butyl ether, 1% of triethanolamine, 1.5% of sodium dodecylbenzene sulfonate, 2% of polyoxyethylene sorbitan monostearate, 2% of polypropylene glycol, and 92% of water.

[0011] Furthermore, the solvent oil is D60 solvent oil or D80 solvent oil.

[0012] The present invention also provides a method for preparing the oil-based-semi-water-based oil pipeline cleaning agent as described above, comprising a step of preparing the oil-based component and a step of preparing the semi-water-based component.

[0013] Furthermore, the step of preparing the oil-based component is to mix ethylene glycol butyl ether with the solvent oil under cooling in a water bath, and then add methyl phenethyl ether and mix them to obtain the oil-based mixed liquid.

[0014] Furthermore, the step of preparing the semi-aqueous component is to prepare an aqueous solution of sodium dodecylbenzene sulfonate, and then add triethanolamine, polyoxyethylene sorbitan monostearate, polypropylene glycol and ethylene glycol butyl ether to the aqueous solution of sodium dodecylbenzene sulfonate, and after each addition of an ingredient, stir first and then add the next ingredient.

[0015] The present invention also provides an application of the above-mentioned oil-based-semi-water-based oil pipeline cleaning agent for cleaning abandoned oil pipelines.

[0016] Furthermore, the oil-based component is first used to clean the oil pipeline, then the semi-aqueous component is used to clean it, and finally water washing is performed.

[0017] The beneficial effects of the present invention are:

[0018] (1) The oil-based and semi-aqueous oil pipeline cleaning agent of the present invention has good oil-wax dissolving efficiency and can thoroughly clean waste oil pipelines with severe wax deposition and dense oil-wax layers;

[0019] (2) The oil-based and semi-aqueous oil pipeline cleaning agent of the present invention does not contain any hazardous or toxic components, is non-corrosive, has low volatility, and has good environmental protection effects;

[0020] (3) The oil-based and semi-aqueous oil pipeline cleaning agent of the present invention ensures the chemical cleaning quality of waste oil pipelines, enables waste oil pipelines to be reused, avoids safety accidents and environmental pollution accidents in the disposal of waste pipelines, and thus effectively reduces the economic losses of enterprises;

[0021] (4) The preparation method of the oil-based-semi-aqueous oil pipeline cleaning agent of the present invention has simple steps, low cost and mild conditions, and can fully guarantee the safety, environmental protection, quality and construction period of the chemical cleaning of the waste pipeline, meet the performance index requirements of the waste oil pipeline cleaning agent such as safety, environmental protection and oil wax dissolution, solve the technical problems that the existing pipeline cleaning agent has poor cleaning effect on waste oil pipelines with severe wax deposition and dense oil wax layer, the cleaning agent has great damage to the human body and the environment, and the cleaning agent has great safety risks, and has great application prospects and social and economic value;

[0022] (5) The application of the oil-based-semi-aqueous oil pipeline cleaning agent of the present invention can effectively clean abandoned pipelines, and the steps are simple, easy to operate, and not prone to environmental pollution, and is suitable for large-scale promotion and use. DETAILED DESCRIPTION

[0023] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0024] The oil-based-semi-water-based oil pipeline cleaning agent of the present invention comprises an oil-based component and a semi-water-based component. The oil-based component comprises ethylene glycol butyl ether, methyl phenyl ether and solvent oil, and the semi-water-based component comprises ethylene glycol butyl ether, triethanolamine, sodium dodecylbenzene sulfonate, polyoxyethylene sorbitan monostearate, polypropylene glycol and water.

[0025] The oil-based and semi-aqueous oil pipeline cleaning agent of the present invention has a very high oil wax dissolving efficiency and can thoroughly clean waste oil pipelines with severe wax deposition and dense oil wax layers, thereby ensuring the quality of chemical cleaning of waste oil pipelines, enabling waste oil pipelines to be reused, avoiding safety accidents and environmental pollution accidents in the disposal of waste pipelines, and effectively reducing economic losses to enterprises.

[0026] Preferably, in the oil-based component, the mass percentage of each component is: 10-15% of ethylene glycol butyl ether, 5%-15% of methyl phenethyl ether, and the balance is solvent oil; the oil-based component prepared by mixing the above components and proportions has good oil wax dissolving efficiency.

[0027] Preferably, in the semi-aqueous component, the mass percentage of each component is: 1% to 2% of ethylene glycol butyl ether, 1% to 2% of triethanolamine, 1% to 2% of sodium dodecylbenzene sulfonate, 1% to 2% of polyoxyethylene sorbitan monostearate, 1% to 2% of polypropylene glycol, and the balance is water; among the above components, especially sodium dodecylbenzene sulfonate and ethylene glycol butyl ether, can effectively clean the oil-based components and other residues of the soluble oil.

[0028] Preferably, in the oil-based component, the mass percentage of each component is: 10% of ethylene glycol butyl ether, 10% of methyl phenethyl ether, and 80% of solvent oil; in the semi-aqueous component, the mass percentage of each component is: 1.5% of ethylene glycol butyl ether, 1% of triethanolamine, 1.5% of sodium dodecylbenzene sulfonate, 2% of polyoxyethylene sorbitan monostearate, 2% of polypropylene glycol, and 92% of water.

[0029] Preferably, the solvent oil is D60 solvent oil or D80 solvent oil.

[0030] The method for preparing the oil-based-semi-water-based oil pipeline cleaning agent of the present invention comprises the steps of preparing the oil-based component and the step of preparing the semi-water-based component.

[0031] Preferably, the step of preparing the oil-based component is to mix ethylene glycol butyl ether with solvent oil under cooling in a water bath, and then add methyl phenethyl ether and mix to obtain an oil-based mixed solution.

[0032] Preferably, the water bath cooling temperature is 10°C to 30°C.

[0033] Preferably, in the step of preparing the semi-aqueous component, an aqueous solution of sodium dodecylbenzene sulfonate is prepared, and triethanolamine, polyoxyethylene sorbitan monostearate, polypropylene glycol and ethylene glycol butyl ether are added thereto in sequence. After each component is added, stirring is performed before adding the next component.

[0034] The oil-based-semi-water-based oil pipeline cleaning agent of the present invention is used for cleaning abandoned oil pipelines.

[0035] The specific application method is to first use the oil-based component to clean the oil pipeline, and then use the semi-water-based component to clean the oil pipeline. First, use the oil-based component to desorb the dense oil wax residue from the solid surface, so that the oil wax is completely dissolved in the oil-based component, and then use the semi-water-based component to thoroughly clean the residual oil-containing oil-based component. In this way, the abandoned oil pipeline with serious wax deposition and dense oil wax layer can be thoroughly cleaned.

[0036] Preferably, in actual use, the amount of the oil-based component should be selected according to the residual oil wax in the abandoned oil pipeline. In principle, the oil-based component used should be able to completely dissolve the residual oil wax. Generally, the mass ratio of the oil-based component to the oil wax is 2:1. Similarly, the amount of the semi-water-based component should also be determined according to the amount of the oil-based component that dissolves the oil. Generally, the ratio of the two is 1:1.

[0037] Preferably, after the cleaning with the semi-aqueous component is completed, the remaining semi-aqueous component is rinsed with clean water of the same mass as the semi-aqueous component to improve the cleaning effect.

[0038] The present invention is illustrated below by means of specific examples.

[0039] Example 1

[0040] The oil-based and semi-aqueous oil pipeline cleaning agent of the present embodiment comprises the following components: the oil-based component is 80% of D60 solvent oil, 10% of ethylene glycol butyl ether, and 10% of methyl phenyl ether; the semi-aqueous component is 1.5% of ethylene glycol butyl ether, 1% of triethanolamine, 1.5% of sodium dodecylbenzene sulfonate, 2% of polyoxyethylene sorbitan monostearate, 2% of propylene glycol, and 92% of water.

[0041] The preparation method of this embodiment comprises the following steps:

[0042] Under cooling conditions in a water bath, 10% ethylene glycol butyl ether and 80% D60 solvent oil were mixed and stirred evenly to obtain a first mixed solution. The first mixed solution was mixed with 10% methyl phenethyl ether by mass, stirred evenly, and cooled to room temperature to obtain an oil-based component.

[0043] Dissolve 1.5% sodium dodecylbenzene sulfonate in water and stir until completely dissolved to obtain a second mixed solution; mix the second mixed solution with 1% triethanolamine and stir evenly to obtain a third mixed solution; mix the third mixed solution with 2% polyoxyethylene sorbitan monostearate and 2% polypropylene glycol and stir evenly to obtain a fourth mixed solution; mix the fourth mixed solution with 1.5% ethylene glycol butyl ether and stir evenly to obtain a semi-aqueous component.

[0044] Example 2

[0045] The oil-based and semi-aqueous oil pipeline cleaning agent of this embodiment comprises the following components: the oil-based component: 75% D60 solvent oil, 15% ethylene glycol butyl ether, and 10% methyl phenyl ether; the semi-aqueous component: 2% ethylene glycol butyl ether, 1% triethanolamine, 2% sodium dodecylbenzene sulfonate, 1% polyoxyethylene sorbitan monostearate, 1% polypropylene glycol, and 93% water.

[0046] The preparation method of this embodiment comprises the following steps:

[0047] Under cooling conditions in a water bath, 15% ethylene glycol butyl ether and 75% D60 solvent oil were mixed and stirred evenly to obtain a first mixed solution. The first mixed solution was mixed with 10% methyl phenethyl ether, stirred evenly, and cooled to room temperature to obtain an oil-based component.

[0048] Dissolve 2% sodium dodecylbenzene sulfonate by mass in water and stir until completely dissolved to obtain a second mixed solution; mix the second mixed solution with 1% triethanolamine by mass and stir evenly to obtain a third mixed solution; mix the third mixed solution with 1% polyoxyethylene sorbitan monostearate and 1% polypropylene glycol by mass and stir evenly to obtain a fourth mixed solution; mix the fourth mixed solution with 2% ethylene glycol butyl ether by mass and stir evenly to obtain a semi-aqueous component.

[0049] Example 3

[0050] The oil-based and semi-aqueous oil pipeline cleaning agent of this embodiment has the oil-based components: 70% D80 solvent oil, 15% ethylene glycol butyl ether, and 15% methyl phenyl ether; the components of the semi-aqueous cleaning agent are: 1% ethylene glycol butyl ether, 2% triethanolamine, 2% sodium dodecylbenzene sulfonate, 2% polyoxyethylene sorbitan monostearate, 3% polypropylene glycol, and 90% water.

[0051] The preparation method of this embodiment comprises the following steps:

[0052] Under water bath cooling conditions, 15% by mass of ethylene glycol butyl ether and 70% of D80 solvent oil are mixed and stirred evenly to obtain a first mixed liquid; the first mixed liquid is mixed with 15% by mass of methyl phenethyl ether, stirred evenly, and cooled to room temperature to obtain an oil-based component.

[0053] Dissolve 2% sodium dodecylbenzene sulfonate by mass in water and stir until completely dissolved to obtain a second mixed solution; mix the second mixed solution with 2% triethanolamine by mass and stir evenly to obtain a third mixed solution; mix the third mixed solution with 2% polyoxyethylene sorbitan monostearate by mass and 3% polypropylene glycol by mass and stir evenly to obtain a fourth mixed solution; mix the fourth mixed solution with 1% ethylene glycol butyl ether by mass and stir evenly to obtain a semi-aqueous component.

[0054] The oil pipeline cleaning agents prepared in Examples 1 to 3 were tested. During the tests, the oil-based component and the semi-water-based component were respectively tested.

[0055] (1) Test the oil-to-oil mass ratio and dissolution saturation time of the oil-based component. The test steps are as follows:

[0056] a) Take a 250mL clean and dry glass beaker, weigh it with a 0.01g precision balance and record the weight of the empty beaker m 1 Take 5-6g of wax sample and smear it on the bottom of an empty beaker to form a wax film about 3mm thick. Use the beaker as the test beaker, weigh it and record the wax weight m 2 .

[0057] b) Add the same weight of oil-based components as the oil wax sample into the test beaker, seal the beaker mouth with sealing film, place the test beaker in a low-temperature constant temperature water bath, set the temperature to the average ground temperature of the area where the abandoned pipeline disposal project is located, and then start timing.

[0058] c) Slightly shake the beaker 3 to 5 times every 1 minute to observe the dissolution of the wax. After a certain test interval (5 to 10 minutes, shorten or extend the time depending on how fast the wax dissolves), pour the oil-based components of the wax dissolved in the test beaker through a filter sieve into a clean, dry empty beaker, and weigh the weight of the test beaker and the undissolved wax. 3 , the weight of the oil wax dissolved by the oil-based component is m c (m 1 +m 2 -m 3 ), then pour the oil-based component of the dissolved oil wax back into the original test beaker, seal the beaker mouth with sealing film, and restart the timing.

[0059] d) When the weight of the oil wax dissolved by the oil-based component basically no longer changes, it is considered that the dissolution has reached saturation and the measurement is stopped. Otherwise, continue with the previous step.

[0060] e) Calculate the oil-soluble mass ratio of the oil-based component and record the dissolution saturation time test.

[0061] The calculation formula is as follows:

[0062] Oil-to-oil mass ratio of the oil-based component: Under the above experimental test conditions, when the oil-to-wax dissolved in the oil-based component is saturated, the ratio of the mass of the oil-to-wax dissolved in the oil-based component to the total mass of the oil-to-wax dissolved in the oil-based component. The oil-to-oil mass ratio of the oil-to-wax component is calculated according to formula (1).

[0063]

[0064] In formula (1):

[0065] X—mass ratio of oil-based component to dissolved oil, %;

[0066] m 2 —Mass of oil-based component used, g;

[0067] m c —Mass of oil wax dissolved in oil-based components, g.

[0068] The oil-based components in Examples 1 to 3 have lower oil-soluble mass ratios and dissolution saturation times, wherein the oil-soluble mass ratios of Example 1, Example 2 and Example 3 are 1.82:1, 1.93:1 and 2.01:1, respectively, and the dissolution saturation times are all 20 minutes.

[0069] (2) Perform oil film water washing test on semi-aqueous components. The specific steps are as follows:

[0070] Pour the oil-based components tested in Experimental Examples 1 to 3 into a stainless steel barrel to form an oil film on the bottom of the barrel, add a semi-water-based component that can cover the bottom of the barrel, shake it slightly for 1 to 2 minutes, and pour out the detergent that has dissolved the oil film. Then tilt the stainless steel barrel, use a straw to draw about 20 mL of water to partially rinse the upper part of the bottom of the barrel, and observe the water rinsing condition of the upper part of the bottom of the stainless steel barrel.

[0071] After the oil film water flushing test of Examples 1 to 3, there was no oil, wax or cleaning agent residue on the bottom of the stainless steel barrel.

[0072] Through the above tests, it can be known that the present invention utilizes oil-based components and semi-aqueous components to effectively desorb dense oil wax residues from solid surfaces, so that the oil wax is completely dissolved in the oil-based components. The cleaning agent has a high oil dissolving capacity and a short dissolution saturation time. The residual oil-containing oil-based components can be thoroughly cleaned through the semi-aqueous components, and has a good effect on the harmless disposal of abandoned oil pipelines with severe wax deposition and dense oil wax layers, thereby ensuring the quality of chemical cleaning of abandoned oil pipelines.

[0073] The cleaning agent of the present invention has high safety and environmental protection performance indicators and has been applied on-site in waste oil pipeline disposal projects in the Northeast region. The oil and wax dissolution rate and dissolution amount are large. After cleaning, the waste oil pipeline is free of oil and wax, and the concentration of combustible gas is zero, and it has a good cleaning effect.

[0074] In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0075] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0077] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil-based / semi-water-based oil pipeline cleaning agent, characterized in that: The invention comprises an oil-based component and a semi-water-based component. The oil-based component comprises ethylene glycol butyl ether, methyl phenyl ether and solvent oil, and the semi-water-based component comprises ethylene glycol butyl ether, triethanolamine, sodium dodecylbenzene sulfonate, polyoxyethylene sorbitan monostearate, polypropylene glycol and water.

2. The oil-based / semi-water-based oil pipeline cleaning agent according to claim 1, characterized in that: The mass percentages of the various components in the oil-based component are: 10-15% of ethylene glycol butyl ether, 5%-15% of methyl phenethyl ether, and the balance is the solvent oil.

3. The oil-based / semi-water-based oil pipeline cleaning agent according to claim 2, characterized in that: The mass percentages of the components in the semi-aqueous component are: 1% to 2% ethylene glycol butyl ether, 1% to 2% triethanolamine, 1% to 2% sodium dodecylbenzene sulfonate, 1% to 2% polyoxyethylene sorbitan monostearate, 1% to 2% polypropylene glycol, and the balance is water.

4. The oil-based / semi-water-based oil pipeline cleaning agent according to claim 2, characterized in that: The mass percentage of each component in the oil-based component is: 10% of ethylene glycol butyl ether, 10% of methyl phenyl ether, and 80% of the solvent oil; the mass percentage of each component in the semi-aqueous component is: 1.5% of ethylene glycol butyl ether, 1% of triethanolamine, 1.5% of sodium dodecylbenzene sulfonate, 2% of polyoxyethylene sorbitan monostearate, 2% of polypropylene glycol, and 92% of water.

5. The oil-based / semi-water-based oil pipeline cleaning agent according to any one of claims 1 to 4, characterized in that: The solvent oil is D60 solvent oil, D80 solvent oil or a mixture of the two.

6. A method for preparing an oil-based / semi-water-based oil pipeline cleaning agent as claimed in any one of claims 1 to 5, characterized in that: The method comprises the steps of preparing the oil-based component and the step of preparing the semi-aqueous-based component.

7. The method for preparing an oil-based / semi-water-based oil pipeline cleaning agent according to claim 6, characterized in that: The step of preparing the oil-based component is to mix ethylene glycol butyl ether with the solvent oil under the condition of water bath cooling, and then add methyl phenethyl ether and mix them to obtain the oil-based mixed liquid.

8. The method for preparing an oil-based / semi-water-based oil pipeline cleaning agent according to claim 6, characterized in that: The step of preparing the semi-aqueous component is to prepare a sodium dodecylbenzene sulfonate aqueous solution, and then add triethanolamine, oxyethylene sorbitan monostearate poly, polypropylene glycol and ethylene glycol butyl ether to the sodium dodecylbenzene sulfonate aqueous solution, and after each component is added, stir it first and then add the next component.

9. An application of the oil-based / semi-water-based oil pipeline cleaning agent as claimed in any one of claims 1 to 5, characterized in that: Used for cleaning abandoned oil pipelines.

10. The use of an oil-based / semi-water-based oil pipeline cleaning agent according to claim 9, characterized in that: The oil-based component is first used to clean the oil pipeline, then the semi-water-based component is used for cleaning, and finally water washing is performed.

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