An oilfield oily sludge treatment agent

Abstract

The present application relates to a kind of oilfield oily sludge treating agent, the treating agent contains nano alumina modified sulfolane;The nano alumina modified sulfolane is prepared by ultrasonic reaction in solvent with sulfolane and nano alumina as raw material.The nano alumina modified sulfolane in the treating agent of the present application, on the mechanism of traditional oil-soluble treating agent, using the interface effect of nano particle and the hydrophilic lipophilicity of modified sulfolane, can greatly improve the demulsification ability and penetration ability of treating agent, increase the contact surface with the inside of oily sludge, and the extraction effect is significantly enhanced;Its hydrophilic lipophilicity simultaneously solves the limitation requirement of conventional oil-soluble treating agent to low water content of oily sludge before application.And the oily sludge treating agent implementation application condition is simple, does not need to air dry or dry for a long time to crude oil mud sample, also does not need heating, just needs to be simply mixed to handle.

Description

TECHNICAL FIELD

[0001] The present application relates to an oilfield oily sludge treatment agent, and belongs to the technical field of oily sludge treatment. BACKGROUND

[0002] A large amount of oily sludge is generated in the production processes of oilfield oil storage and transportation, refining and sewage treatment. In addition to crude oil, the sludge also contains asphaltene, wax, colloid, organic polymer, bacteria and suspended solids. The commonly used treatment technologies include extraction method, coking method, biological method and incineration method. Each method has its own advantages and disadvantages. The extraction method has the technical advantages of low energy consumption, no waste of resources and no secondary pollution, and is applied more and more widely. However, the selection of the extraction agent becomes the key to restricting the technology.

[0003] A Chinese patent with the authorized publication number CN102836568B discloses an extraction solvent for oily sludge. The extraction solvent consists of the following components, with the total volume of the extraction solvent being 100%: main agent A, distillate oil with a boiling range of 110-135℃, accounting for 85%-95%; auxiliary agent B, distillate oil with a boiling range of 140-150℃, accounting for 4%-12%; and auxiliary agent C, distillate oil with a boiling range of 80-100℃ or an industrial pure product, accounting for 1%-5%. The industrial pure product is butanone, heptane or 1,2-dichloroethane. The extraction solvent has relatively good extraction effect, but before the oily sludge is extracted, the crude sludge sample needs to be air-dried or oven-dried for a long time, which is complicated and time-consuming, and is not suitable for large-scale actual production.

[0004] A Chinese patent with the application publication number CN102826728A discloses a cleaning agent applied to hot washing method for treating oily sludge and a preparation method thereof. The components and proportions of the cleaning agent are as follows in terms of weight percentage: polyoxypropylene polyoxyethylene phenolic resin ether 10%-20%, sodium dodecyl benzene sulfonate 20%-30%, fatty alcohol polyoxyethylene ether sodium sulfate (AES) 1%-5%, sodium hydroxide 5%-10%, methanol 5-10%, and the rest is water. The sum of the percentages of the components is equal to 100%. The cleaning agent has both demulsification and cleaning functions, and can improve the separation effect of oil and sludge. However, the raw material price of the method is relatively high, the application cost is also high, and the oily sludge needs to be heated and stirred during cleaning, which increases the use difficulty and is not suitable for large-scale actual production. SUMMARY

[0005] The present application aims to provide an oilfield oily sludge treatment agent to solve the problems of complex composition, high cost, complicated use process and long treatment time of the existing oily sludge treatment agent, which leads to the problem of unsuitability for large-scale actual production.

[0006] To achieve the above-mentioned purpose, the technical scheme of an oilfield oily sludge treatment agent in the present application is:

[0007] The oilfield oily sludge treatment agent contains nano-alumina modified sulfolane; the nano-alumina modified sulfolane is prepared by ultrasonic reaction in a solvent, using sulfolane and nano-alumina as raw materials.

[0008] The technical scheme has the beneficial effects that the sulfolane structure has ideal extraction effect on aromatic hydrocarbon oil, and the nano-Al2O3 has strong interfacial activity and demulsification capacity, and can effectively penetrate into the inside of the sludge. The present application uses the interfacial effect of nano particles and the hydrophilic and lipophilic property of modified sulfolane, so that the demulsification capacity and penetration capacity of the treatment agent are greatly improved, the contact surface with the inside of the oily sludge is increased, and the extraction effect is significantly enhanced. The oilfield oily sludge treatment agent prepared by the present application has hydrophilic and lipophilic property, and solves the limitation requirement of conventional oil-soluble extractant on low water content of the oily sludge before application. Moreover, the oily sludge treatment agent has simple application conditions, and does not need to be dried for a long time or heated, but only needs to be simply mixed and treated.

[0009] Specifically, the reaction principle of nano-alumina and sulfolane is as follows:

[0010]

[0011] Specifically, nano-alumina and sulfolane are used as raw materials, water is used as a solvent, the temperature is controlled at 80-100 DEG C, and ultrasonic reaction is performed for 10-20 min, then the product is washed, vacuum filtered, and dried to obtain a gray-white powder sample, that is, the nano-alumina modified sulfolane.

[0012] The washing process can be hot washing or cold washing, and to increase the yield and purity of the nano-alumina modified sulfolane, the washing is preferably hot washing.

[0013] As a further improvement, the mass ratio of the sulfolane to the nano-alumina is 1:(0.65-0.75).

[0014] The nano-alumina structure is β-Al2O3 type or γ-Al2O3 type.

[0015] To obtain a product with appropriate particle size, the particle size of the nano-alumina is 10-40 nm.

[0016] As a further improvement, the power of the ultrasonic is 60-120 W·cm -2 , and the frequency is 20-30 kHz.

[0017] As a further improvement, the ultrasonic reaction is performed at a temperature of 80-100 DEG C for 10-20 min.

[0018] As a further improvement, the oilfield oily sludge treatment agent is composed of nano-alumina modified sulfolane and crude oil extractant.

[0019] The beneficial effects of the above technical solution are that the nano-alumina modified sulfolane in the oilfield oily sludge treatment agent contains a sulfolane structure, has an ideal extraction effect on aromatic hydrocarbon oil, and the nano-Al2O3 has strong interfacial activity and demulsification ability, can effectively penetrate into the inside of the sludge, and is beneficial to the extraction of oily substances; the crude oil extractant mainly plays a role in eluting the crude oil on the surface of the solid phase, and the crude oil extractant selects a solvent with similar oil in the oily sludge, high compatibility and high solubility, so that better extraction effect can be achieved. Further, the nano-alumina modified sulfolane has good hydrophilic and lipophilic properties, good compatibility with the oil-water system of the oily sludge, strong penetration and extraction ability, can effectively promote and improve the penetration ability of the crude oil extractant, thereby being beneficial to the washing effect of high molecular weight asphaltene and heavy oil components.

[0020] The crude oil extractant includes 4-methyl-2-pentanone, petroleum ether, naphtha, 120# solvent oil, light oil, and n-heptane.

[0021] As a further improvement, the mass ratio of the nano-alumina modified sulfolane to the crude oil extractant is 1:(3-7).

[0022] As a further improvement, the crude oil extractant is 4-methyl-2-pentanone and petroleum ether.

[0023] In order to enhance the extraction effect, the boiling range of the petroleum ether is 90-120℃.

[0024] As a further improvement, the mass ratio of the 4-methyl-2-pentanone to the petroleum ether is (1-2):(2-5). DETAILED DESCRIPTION

[0025] The application will be further described below in conjunction with specific embodiments. It should be noted that the embodiments described below or the technical features thereof can be combined with each other to form new embodiments without conflict. The equipment and raw materials used can be purchased from the market or are commonly used in the art. The methods in the following examples are conventional methods in the art unless otherwise specified.

[0026] In the application, the detection standard is the oil content in the oily sludge, and the oil content is detected according to Q / SH 0745-2018 “Oil content determination method for oilfield sludge”.

[0027] The boiling range of the petroleum ether used in the embodiments of the application is 90-120℃.

[0028] I. Preparation of nano-alumina modified sulfolane

[0029] The present application uses sulfolane and nano-alumina as raw materials, water as solvent, and ultrasonic reaction to prepare nano-alumina modified sulfolane, and the specific process is as follows:

[0030] Preparation Example 1

[0031] In a 500 mL reaction flask, 100 g of sulfolane was added, and distilled water was added to 1 / 3 of the volume of the flask. The temperature was controlled at 80°C, and 65 g of nano-alumina was slowly added under ultrasonic conditions. The ultrasonic power was 60 W·cm -2 , the frequency was 20 kHz, and the ultrasonic reaction was carried out for 10 min. After the reaction liquid was washed and vacuum filtered, the sample was obtained as a grayish white powder after drying.

[0032] Preparation Example 2

[0033] In a 500 mL reaction flask, 100 g of sulfolane was added, and distilled water was added to 1 / 3 of the volume of the flask. The temperature was controlled at 85°C, and 75 g of nano-alumina was slowly added under ultrasonic conditions. The ultrasonic power was 80 W·cm -2 , the frequency was 25 kHz, and the ultrasonic reaction was carried out for 15 min. After the reaction liquid was washed and vacuum filtered, the sample was obtained as a grayish white powder after drying.

[0034] The operation steps of Preparation Examples 3-9 are the same as those of Preparation Examples 1 and 2, and the components and experimental conditions are shown in Table 1.

[0035] Table 1 Reaction components and conditions of nano-alumina modified sulfolane in Preparation Examples 3-9

[0036]

[0037]

[0038] II. An embodiment of an oilfield oily sludge treatment agent

[0039] Example 1

[0040] The oilfield oily sludge treatment agent of this embodiment is composed of nano-alumina modified sulfolane, 4-methyl-2-pentanone, and petroleum ether, and the specific implementation operation is as follows:

[0041] 20 g of nano-alumina modified sulfolane, 20 g of 4-methyl-2-pentanone, and 40 g of petroleum ether were uniformly stirred and mixed at room temperature to obtain an oily sludge treatment agent.

[0042] Example 2

[0043] The oilfield oily sludge treatment agent of this embodiment is composed of nano-alumina modified sulfolane, 4-methyl-2-pentanone, and petroleum ether, and the specific implementation operation is as follows:

[0044] 20g nano-alumina modified sulfolane, 20g 4-methyl-2-pentanone, 60g petroleum ether were mixed at room temperature under uniform stirring to obtain an oily sludge treatment agent.

[0045] The compositions of Examples 3-10 were the same as those of Examples 1 and 2, and the amounts of the components were shown in Table 2.

[0046] Table 2: Component amounts of oily sludge treatment agents in Examples 3-10

[0047] Name Nanometer alumina modified sulfolane (g) 4-methyl-2-pentanone (g) petroleum ether (g) Example 3 20 20 50 Example 4 20 30 70 Example 5 20 40 60 Example 6 20 30 80 Example 7 20 20 90 Example 8 20 30 80 Example 9 20 20 100 Example 10 20 40 90

[0048] III. Comparative Examples

[0049] Comparative Example 1

[0050] The oily sludge treatment agent of the present comparative example was different from that of Example 1 only in that the nano-alumina modified sulfolane was replaced by nano-alumina, and the others were the same.

[0051] Comparative Example 2

[0052] The oily sludge treatment agent of the present comparative example was different from that of Example 2 only in that the nano-alumina modified sulfolane was replaced by sulfolane, and the others were the same.

[0053] Comparative Example 3

[0054] The oily sludge treatment agent of the present comparative example was different from that of Example 3 in that the nano-alumina modified sulfolane was replaced by a mixture of nano-alumina and sulfolane, and the others were the same. The mixture of nano-alumina and sulfolane was prepared by mixing 100g of sulfolane and 65g of nano-alumina uniformly, and then 20g of the mixed nano-alumina and sulfolane was added to the oily sludge treatment agent of Comparative Example 3.

[0055] IV. Experimental Example: Application of Oilfield Oily Sludge Treatment Agent in Oil and Gas Field Sludge Treatment

[0056] Experimental Example 1

[0057] The oily sludge treatment agents of Examples 1-10 and Comparative Examples 1-3 were verified for application effect in the present experimental example, and the specific experimental steps were as follows:

[0058] After the oily sludge treatment agent of examples 1-10 and comparative examples 1-3 is diluted with water into a treatment agent working solution (diluted to 20%), the oily sludge and the treatment agent working solution are mixed at a volume ratio of 1:(1-5), and stirred (50-100 revolutions / minute) at room temperature for 20-40 minutes. The sludge is recovered to a sludge pool, the liquid phase is allowed to stand for 3-5 minutes, and the oil content in the solid phase is detected after layering, and compared with the oil content before treatment. The specific operation steps refer to Q / SH 0745-2018 "Oil content determination method of oilfield sludge". The addition amount of the treatment agent working solution and the oil content before and after treatment are shown in Table 3.

[0059] Table 3 Application effect of oily sludge treatment

[0060]

[0061] As shown in Table 3, the oily sludge treatment agent in the present application has good elution effect on oily sludge, and the crude oil recovery rate can reach more than 99%, which is significantly better than the treatment effect in the comparative examples.

[0062] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. The patent protection scope of the present application is subject to the claims, and any equivalent structural changes made by using the content of the present application should also be included in the protection scope of the present application.

Claims

1. An oilfield oil-bearing sludge treatment agent, characterized by: The treatment agent contains nano-alumina modified sulfolane; the nano-alumina modified sulfolane is prepared by ultrasonic reaction in a solvent, using sulfolane and nano-alumina as raw materials.

2. The oilfield oil-containing sludge treatment agent according to claim 1, characterized by: The mass ratio of the sulfolane and nano-alumina is 1:(0.65-0.75).

3. The oilfield oil-containing sludge treatment agent according to claim 1, characterized by: The power of the ultrasound is 60-120 W-cm -2 and the frequency is 20-30 kHz.

4. The oilfield oil-containing sludge treatment agent according to claim 1, characterized by: The ultrasonic reaction is carried out under ultrasonic conditions at a temperature of 80-100 ℃ for 10-20 min.

5. The oilfield oil-containing sludge treatment agent according to any one of claims 1 to 4, characterized by: The oilfield oily sludge treatment agent is composed of nano-alumina modified sulfolane and crude oil extractant.

6. The oilfield oil-containing sludge treatment agent according to claim 5, characterized by: The mass ratio of the nano-alumina modified sulfolane and crude oil extractant is 1:(3-7).

7. The oilfield oil-containing sludge treatment agent according to claim 6, characterized by: The crude oil extractant is 4-methyl-2-pentanone and petroleum ether.

8. The oilfield oil-containing sludge treatment agent according to claim 7, characterized by: The mass ratio of the 4-methyl-2-pentanone and petroleum ether is (1-2):(2-5).

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