Oily sludge treatment agent for oil field

Abstract

The invention relates to a treating agent for oily sludge in an oil field. The treating agent contains nano aluminum oxide modified sulfolane, the nano aluminum oxide modified sulfolane is prepared by taking sulfolane and nano aluminum oxide as raw materials and carrying out ultrasonic reaction in a solvent. According to the nano aluminum oxide modified sulfolane in the treating agent, on the basis of the mechanism of a traditional oil-soluble treating agent, the demulsification capacity and infiltration capacity of the treating agent can be greatly improved by utilizing the interfacial effect of nano particles and the hydrophilicity and lipophilicity of the modified sulfolane, the contact surface with the interior of the oily sludge is enlarged, and the extraction effect is remarkably enhanced; and meanwhile, the limitation requirement of a conventional oil-soluble treating agent on low water content of oily sludge before application is met by virtue of hydrophilicity and lipophilicity of the oil-soluble treating agent. The oily sludge treatment agent is simple in implementation and application conditions, does not need to air-dry or dry a crude oil sludge sample for a long time, does not need to heat, and only needs simple mixing treatment.

Description

Technical Field

[0001] The invention relates to an oilfield oily sludge treating agent, belonging to the technical field of oily sludge treatment. Background Art

[0002] A large amount of oily sludge is generated during the production processes of oil storage and transportation, refining and sewage treatment in oil fields. In addition to crude oil, the sludge also contains asphaltene, wax, colloid, organic polymer, bacteria and suspended matter. Commonly used treatment technologies include extraction, coking, biological method, incineration, etc. Each method has its own advantages and disadvantages. Among them, the extraction method is increasingly widely used due to its technical advantages such as low energy consumption, no waste of resources and no secondary pollution. However, the selection of extraction agent has become the key to restricting this technology.

[0003] The Chinese invention patent with the authorization announcement number CN102836568B discloses an extraction solvent for oily sludge. Taking the total volume of the extraction solvent as 100%, the extraction solvent is composed of the following components: main agent A, distillate oil with a boiling range of 110-135°C, accounting for 85%-95%; auxiliary agent B, distillate oil with a boiling range of 140-150°C, accounting for 4%-12%; auxiliary agent C, distillate oil with a boiling range of 80-100°C or industrial pure products, accounting for 1%-5%; the industrial pure products are butanone, heptane, 1,2-dichloroethane. The extraction solvent has a relatively good extraction effect, but before extracting the oily sludge, the crude oil mud sample needs to be air-dried or dried for a long time, which is cumbersome and takes a long time to process, and is not suitable for large-scale actual production.

[0004] The Chinese invention patent with application publication number CN102826728A discloses a cleaning agent and its preparation method for treating oily sludge by hot washing method. The cleaning agent components and proportions are as follows by weight percentage: 10%-20% polyoxypropylene polyoxyethylene phenolic resin ether, 20%-30% sodium dodecylbenzene sulfonate, 1%-5% sodium sulfate of fatty alcohol polyoxyethylene ether (AES), 5%-10% sodium hydroxide, 5-10% methanol, and the rest is water, and the sum of the percentages of each component is equal to 100%. The cleaning agent has both demulsification and cleaning functions, and can improve the oil-cement separation effect, but the raw material price of this method is relatively high, and the application cost is relatively high; and heating and stirring are required when cleaning the oily sludge, which increases the difficulty of use and is not suitable for large-scale actual production. Summary of the invention

[0005] The purpose of the present invention is to provide an oilfield oily sludge treating agent to solve the problem that the oily sludge treating agent in the prior art has complex components, high cost, complex use process, long treatment time, and is not suitable for large-scale actual production.

[0006] In order to achieve the above object, the technical scheme of an oilfield oily sludge treating agent in the present invention is:

[0007] An oilfield oily sludge treating 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 beneficial effects of the above technical solution are: the sulfolane structure has an ideal extraction effect on aromatic hydrocarbon oils, and the nano-Al 2 O 3 It has strong interfacial activity and demulsification ability, and can effectively penetrate deep into the sludge. The present invention utilizes the interfacial effect of nanoparticles and the hydrophilicity and lipophilicity of modified cyclopentane sulfone, which can greatly improve the demulsification ability and penetration ability of the treatment agent, increase the contact surface with the inside of the oily sludge, and significantly enhance the extraction effect. The hydrophilicity and lipophilicity of the oilfield oily sludge treatment agent prepared by the present invention simultaneously solve the restriction requirement of conventional oil-soluble extractants on the low water content of the oily sludge before application. Moreover, the application conditions of the oily sludge treatment agent are simple, and there is no need to air-dry or dry the crude oil mud sample for a long time, nor to heat it, and only a simple mixing process is required.

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

[0010]

[0011] The specific process is: using sulfolane and nano-alumina as raw materials, water as solvent, controlling the temperature at 80-100°C, ultrasonically reacting for 10-20 minutes, washing and vacuum filtering, and drying to obtain an off-white powder sample, which is nano-alumina modified sulfolane.

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

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

[0014] The nano-alumina structure is β-Al 2 O 3 Type or γ-Al 2 O 3 type.

[0015] In order to obtain a product with a suitable particle size, the particle size of the nano-alumina is 10 to 40 nm.

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

[0017] As a further improvement, the ultrasonic reaction is carried out at a temperature of 80 to 100° C. for 10 to 20 minutes.

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

[0019] The beneficial effect of the above technical solution is that the nano-alumina modified sulfolane in the oilfield oily sludge treatment agent of the present invention contains a sulfolane structure, which has an ideal extraction effect on aromatic oils. 2 O 3 It has strong interfacial activity and demulsification ability, can effectively penetrate into the sludge, and is conducive to the extraction of oil-containing substances; the crude oil extractant mainly plays the role of eluting the crude oil on the solid surface, and the crude oil extractant selects a solvent with high solubility similar to the oil in the oily sludge, so as to achieve a better extraction effect. Furthermore, nano-alumina modified cyclopentane has good hydrophilic and lipophilic properties, has good compatibility with the oil-water system of oily sludge, has strong penetration and extraction ability, can effectively promote and improve the penetration ability of the crude oil extractant, and is conducive to the extraction and washing effect of high molecular weight asphaltene and heavy oil components.

[0020] The crude oil extractant includes 4-methyl-2-pentanone, petroleum ether, naphtha, No. 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°C.

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

[0025] The present invention is further described below in conjunction with specific embodiments. It should be noted that, under the premise of no conflict, the embodiments or technical features described below can be arbitrarily combined to form new embodiments. The equipment and raw materials used can be purchased from the market or are commonly used in the art. The methods in the following embodiments are all conventional methods in the art unless otherwise specified.

[0026] The detection standard in the present invention is based on the oil content in the oily sludge, and the oil content is detected according to Q / SH 0745-2018 "Method for Determination of Oil Content in Oilfield Sludge".

[0027] The boiling range of petroleum ether used in the embodiments of the present invention is 90-120°C.

[0028] 1. Preparation of Nano-alumina Modified Sulfolane

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

[0030] Preparation Example 1

[0031] Add 100g of sulfolane to a 500mL reaction flask, then add distilled water to 1 / 3 of the flask volume, control the temperature at 80°C, and slowly add 65g of nano-alumina under ultrasonic conditions with an ultrasonic power of 60W·cm -2 , frequency 20kHz, after ultrasonic reaction for 10 minutes, the reaction liquid was hot washed and vacuum filtered, and an off-white powder sample was obtained after drying.

[0032] Preparation Example 2

[0033] Add 100g of sulfolane to a 500mL reaction flask, then add distilled water to 1 / 3 of the flask volume, control the temperature at 85°C, and slowly add 75g of nano-alumina under ultrasonic conditions with an ultrasonic power of 80W·cm -2 , frequency 25kHz, after ultrasonic reaction for 15 minutes, the reaction liquid was hot washed and vacuum filtered, and an off-white powder sample was obtained after drying.

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

[0035] Table 1 Reactant components and reaction conditions of Nano-alumina Modified Cyclopentane Preparation Examples 3 to 9

[0036]

[0037]

[0038] 2. An embodiment of an oilfield oily sludge treating 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 treating 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] 20 g of nano-alumina-modified sulfolane, 20 g of 4-methyl-2-pentanone, and 60 g of petroleum ether were uniformly stirred and mixed at room temperature to obtain an oily sludge treating agent.

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

[0046] Table 2 Components of the oily sludge treatment agents of Examples 3 to 10

[0047] name Nano-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] 3. Comparative Proportion

[0049] Comparative Example 1

[0050] The oily sludge treating agent of this comparative example is different from that of Example 1 only in that the nano-alumina-modified sulfolane is replaced by nano-alumina, and the rest remains unchanged.

[0051] Comparative Example 2

[0052] The oily sludge treating agent of this comparative example is different from that of Example 2 only in that the nano-alumina-modified sulfolane is replaced by sulfolane, and the rest remains unchanged.

[0053] Comparative Example 3

[0054] The difference between the oily sludge treatment agent of this comparative example and Example 3 is that the nano-alumina modified sulfolane is replaced with a mixture of nano-alumina and sulfolane, and the rest remains unchanged. The mixture of nano-alumina and sulfolane is prepared by mixing 100g of sulfolane and 65g of nano-alumina evenly, and then taking 20g of the evenly mixed nano-alumina and sulfolane mixture and adding it to the oily sludge treatment agent in Comparative Example 3.

[0055] 4. Experimental Example Application of Oilfield Oily Sludge Treatment Agent in Oil and Gas Field Sludge Treatment

[0056] Experimental Example 1

[0057] This experimental example verifies the application effect of the oily sludge treatment agent of Examples 1 to 10 and Comparative Examples 1 to 3. The specific experimental steps are as follows:

[0058] After the oily sludge treatment agents of Examples 1 to 10 and Comparative Examples 1 to 3 were diluted with water to form a treatment agent working solution (diluted to 20%), the oily sludge and the treatment agent working solution were mixed at a volume ratio of 1: (1-5), and stirred at room temperature (50-100 rpm) for 20-40 min. The sludge was recovered to the sludge tank, the liquid phase was allowed to stand for 3-5 minutes, and the oil content in the solid phase was detected after stratification and compared with the oil content before treatment. For specific operation steps, refer to Q / SH 0745-2018 "Method for Determining Oil Content in Oilfield Sludge". The amount of treatment agent working solution added and the oil content before and after treatment are shown in Table 3.

[0059] Table 3 Application effect of oily sludge treatment

[0060]

[0061] It can be seen from Table 3 that the oily sludge treating agent of the present invention has a good elution effect on oily sludge, and its crude oil recovery rate can reach more than 99%, which is significantly better than the treatment effect in the comparative example.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the specification of the present invention should also be included in the protection scope of the present invention.

Claims

1. An oilfield oily sludge treating agent, characterized in that: 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 oily sludge treating agent according to claim 1, characterized in that: The mass ratio of sulfolane to nano-alumina is 1:(0.65-0.75).

3. The oilfield oily sludge treating agent according to claim 1, characterized in that: The power of the ultrasound is 60 to 120 W·cm -2 , frequency 20~30kHz.

4. The oilfield oily sludge treating agent according to claim 1, characterized in that: The ultrasonic reaction is carried out at a temperature of 80 to 100° C. and for 10 to 20 minutes under ultrasonic conditions.

5. The oilfield oily sludge treating agent according to any one of claims 1 to 4, characterized in that: The oilfield oily sludge treating agent consists of nano-alumina-modified sulfolane and a crude oil extractant.

6. The oilfield oily sludge treating agent according to claim 5, characterized in that: The mass ratio of the nano-alumina modified sulfolane to the crude oil extractant is 1:(3-7).

7. The oilfield oily sludge treating agent according to claim 6, characterized in that: The crude oil extracting agent is 4-methyl-2-pentanone and petroleum ether.

8. The oilfield oily sludge treating agent according to claim 7, characterized in that: The mass ratio of the 4-methyl-2-pentanone to petroleum ether is (1-2): (2-5).

Images