An acidic demulsifier for super-heavy oil contaminated with oil

Abstract

The present application relates to the technical field of petroleum chemical treatment agent, and particularly relates to an acidic demulsifier for super heavy oil and dirty oil, which comprises the following components in parts by weight: polyoxypropylene polyoxyethylene octadecanol ether 20-30 parts, alkyl phenol formaldehyde resin polyoxypropylene polyoxyethylene block polymer 20-30 parts, triethanolamine 4-6 parts, sodium dodecyl sulfate 2-4 parts, carboxylic acid 15-25 parts, alcohol 4-6 parts and water 14-20 parts, and has the advantages of good demulsification effect, high dehydration rate and scale inhibition rate and excellent sterilization effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of petrochemical treatment agent, and particularly relates to an acidic demulsifier for super heavy oil and contaminated oil. BACKGROUND

[0002] Super heavy oil refers to oil with a viscosity of greater than 50000 (mPa.s) millipascal seconds. However, super heavy oil contains a large amount of natural emulsifiers such as colloid and asphaltene, and various production measures are taken in the production process, such as the addition of preflush in steam huff and puff and the application of steam assisted gravity drainage technology, which forms double and multiple complex emulsion types such as oil-in-water and water-in-oil, so that the dehydration temperature of super heavy oil is above 85 DEG C, the dehydration temperature is high, and the dehydration is difficult, which leads to serious over-standard of water content in oil.

[0003] Moreover, the pipe outside leakage of super heavy oil well and the accumulated oil on the ground, waste liquid in well repair, sewage accident pool, contaminated oil discharged after oil well operation, and tank bottom contaminated oil form a bacteria gel together with the rapid reproduction of three bacteria (sulfate-reducing bacteria, sulfur bacteria, and iron bacteria), which are adhered to the colloid, asphaltene, clay particles, and various chemical additives in super heavy oil, resulting in more difficult dehydration of super heavy oil and contaminated oil, and forming a large amount of super heavy oil and contaminated oil.

[0004] The water-containing crude oil emulsion has certain selectivity to demulsifiers during demulsification and dehydration. Therefore, it is not easy to find a demulsifier with fast dehydration speed, good low-temperature performance, less water content in purified oil after dehydration, and good sewage quality from a certain series of demulsifiers.

[0005] Demulsifier compounding is an effective method for developing high-efficiency crude oil demulsifiers. High surface activity, sufficient flocculation capacity, strong wettability, and high coalescence performance are necessary conditions for high-efficiency crude oil demulsifiers, and a single component demulsifier cannot fully meet the requirements. Therefore, the demulsifier can be compounded with other substances to improve the effects in multiple aspects. However, conventional demulsifiers still cannot meet the needs of demulsification and dehydration of super heavy oil and contaminated oil.

[0006] Chinese patent application CN113355130A discloses a composite demulsifier for oil-water transition layer, which is composed of A component and B component with a mass ratio of 2:1, wherein the A component is composed of polyamide, long-chain betaine surfactant, long-chain amine oxide surfactant and solvent; the B component is composed of polyether nonionic surfactant, alkyl glycoside surfactant and solvent. The composite demulsifier is suitable for the relatively thick oil-water transition layer of thick oil and super-thick oil emulsion after primary demulsification in the crude oil production fluid combined treatment station. Single demulsifier component or conventional polyether demulsifier cannot complete secondary demulsification. The composite demulsifier does not need to additionally increase stirring and mixing devices during use. After adding 1% to 2% of the demulsifier through a transfer pump, the oil-water two-phase can be self-demulsified after standing for 10 to 30 minutes. However, the composite demulsifier is mainly suitable for secondary demulsification and has poor demulsification effect and low dehydration efficiency when applied to super-thick oil contaminated oil.

[0007] Chinese patent application CN106190229A discloses a super-thick oil high-efficiency demulsifier and a preparation method thereof, which is composed of the following raw materials in parts by weight: C10-16-fatty alcohol polyoxyethylene polyoxypropylene ether 14-19, tetraethylene pentamine polyoxypropylene polyoxyethylene ether 12-17, nonylphenol polyether-10 phosphate ester 7-13, octylphenol polyoxyethylene ether 5-10, ethylene oxide-propylene oxide block copolymer 6-12, sorbitol polyoxyethylene ether hexylaurate 4-8, polyacryldimethyl ammonium tosylate 3-6, sodium dodecyl diphenyl ether disulfonate 5-9, and N-propyl-potassium perfluorooctyl sulfonamide glutamate 4-7. The demulsifier has the advantages of good demulsification performance, fast dehydration speed and low dehydration temperature due to the addition of C10-16-fatty alcohol polyoxyethylene polyoxypropylene ether, tetraethylene pentamine polyoxypropylene polyoxyethylene ether and ethylene oxide-propylene oxide block copolymer. However, the composition of the demulsifier is complex, the preparation cost is high, and it is not suitable for large-scale production and application. Moreover, the demulsification effect is not obvious when applied to super-thick oil contaminated oil.

[0008] Therefore, it is necessary to develop a super-thick oil contaminated oil acidic demulsifier that can solve the above technical problems. SUMMARY

[0009] The purpose of the present application is to overcome the shortcomings of the prior art and provide a super-thick oil contaminated oil acidic demulsifier with good demulsification effect, high dehydration rate and scale inhibition rate, and excellent sterilization effect.

[0010] The present application is realized by the following technical solutions:

[0011] An acidic demulsifier for super heavy oil contaminated oil comprises, by weight fraction, the following components: polyoxypropylene polyoxyethylene octadecanol ether 20-30 parts, alkyl phenol formaldehyde resin polyoxypropylene polyoxyethylene block polymer 20-30 parts, triethanolamine 4-6 parts, sodium dodecyl sulfate 2-4 parts, carboxylic acid 15-25 parts, alcohol 4-6 parts, and water 14-20 parts.

[0012] Preferably, the acidic demulsifier for super heavy oil contaminated oil comprises, by weight fraction, the following components: polyoxypropylene polyoxyethylene octadecanol ether 25 parts, alkyl phenol formaldehyde resin polyoxypropylene polyoxyethylene block polymer 25 parts, triethanolamine 5 parts, sodium dodecyl sulfate 3 parts, carboxylic acid 20 parts, alcohol 5 parts, and water 17 parts.

[0013] Preferably, the polyoxypropylene polyoxyethylene octadecanol ether is SP-169.

[0014] Preferably, the alkyl phenol formaldehyde resin polyoxypropylene polyoxyethylene block polymer is AR-36.

[0015] Preferably, the carboxylic acid is a C2 carboxylic acid.

[0016] Preferably, the carboxylic acid comprises one or more of monochloroacetic acid, dichloroacetic acid, and trichloroacetic acid.

[0017] Preferably, the alcohol comprises one or more of methanol, ethanol, and propanol.

[0018] The present application has the following advantages:

[0019] In the demulsifier for super heavy oil contaminated oil of the present application, the polyoxypropylene polyoxyethylene octadecanol ether has the advantages of clean wastewater and low oil content after water removal, the alkyl phenol formaldehyde resin polyoxypropylene polyoxyethylene block polymer has the advantages of being suitable for high colloid asphaltene crude oil and fast dehydration speed, and the carboxylic acid has the advantages of fast clay removal and scale inhibition. In view of the main emulsification factors of super heavy oil contaminated oil, i.e., high colloid asphaltene + aged oil + clay + oil field chemicals, the components of the demulsifier of the present application have a significant synergistic effect, can quickly reduce the oil-water interfacial tension, and realize effective separation of oil and water. The present application has the advantages of high dehydration degree, fast dehydration speed, and high dehydration efficiency; the raw materials of the product of the present application are all commercially available products, and the preparation process is simple, has the characteristics of small dosage and low cost; the product of the present application has obvious scale inhibition and sterilization effect on water removal. DETAILED DESCRIPTION

[0020] The present application will be further described in conjunction with specific embodiments. The advantages and features of the present application will become more apparent with the description. However, these embodiments are only exemplary and do not constitute any limitation on the scope of the present application. Those skilled in the art should understand that the details and forms of the technical solutions of the present application can be modified or replaced without departing from the spirit and scope of the present application, and such modifications and replacements fall within the protection scope of the present application.

[0021] The crude oil used in the following examples is the super heavy oil contaminated oil from Fengcheng Oilfield in Xinjiang. The properties of the super heavy oil contaminated oil are shown in Table 1. The measurement of the water content of the crude oil is based on GB / T 8929-2006 "Determination of Water Content in Crude Oil (Distillation Method)".

[0022] Table 1 Properties of super heavy oil contaminated oil

[0023]

[0024] Example 1

[0025] A super heavy oil contaminated oil acidic demulsifier, according to parts by weight, comprises the following components: polyoxypropylene polyoxyethylene octadecanol ether SP-169 20 parts, alkyl phenolic resin polyoxypropylene polyoxyethylene block polymer AR-36 20 parts, triethanolamine 4 parts, sodium dodecyl sulfate 2 parts, monochloroacetic acid 15 parts, propanol 4 parts and water 14 parts.

[0026] Example 2

[0027] A super heavy oil contaminated oil acidic demulsifier, according to parts by weight, comprises the following components: polyoxypropylene polyoxyethylene octadecanol ether SP-169 30 parts, alkyl phenolic resin polyoxypropylene polyoxyethylene block polymer AR-36 30 parts, triethanolamine 6 parts, sodium dodecyl sulfate 4 parts, dichloroacetic acid 25 parts, anhydrous ethanol 6 parts and water 20 parts.

[0028] Example 3

[0029] A super heavy oil contaminated oil acidic demulsifier, according to parts by weight, comprises the following components: polyoxypropylene polyoxyethylene octadecanol ether SP-169 25 parts, alkyl phenolic resin polyoxypropylene polyoxyethylene block polymer AR-36 25 parts, triethanolamine 5 parts, sodium dodecyl sulfate 3 parts, trichloroacetic acid 20 parts, methanol 5 parts and water 17 parts.

[0030] Comparative Example 1

[0031] The difference from Example 3 is only that SP-169 is not contained, the amount of AR-36 is adjusted to 50 parts, and the rest of the conditions are the same as those of Example 3.

[0032] Comparative Example 2

[0033] The difference from Example 3 is that AR-36 is not contained, the amount of SP-169 is adjusted to 50 parts, and the rest of the conditions are the same as those of Example 3.

[0034] Comparative Example 3

[0035] The difference from Example 3 is that trichloroacetic acid is not added.

[0036] Test Example 1

[0037] The demulsifier evaluation method refers to SY / T 5281-2000 Crude Oil Demulsifier Performance Test Method (Bottle Test Method), the demulsification temperature is 90℃, and the 5h dehydration rate (%) is calculated. The demulsifier test results of each example are shown in Table 2.

[0038] Table 2

[0039] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 5h Dehydration rate (%) 94.8 94.3 96.5 53.6 46.7 15.4 Water in oil (%) 1.5 1.5 1.4 31.8 32.6 44.4 Scale inhibition rate (%) 92.4 90.4 93.6 91.5 91.0 11.8 Bactericidal rate (%) 100 100 100 100 100 0

[0040] The above detailed description is a specific description of one of the feasible embodiments of the present application, which is not used to limit the patent scope of the present application, and any equivalent implementation or change without departing from the present application shall be included in the scope of the technical scheme of the present application.

Claims

1. A super-thick oily acid demulsifier, characterized in that, By weight, it includes the following components: 20-30 parts of polyoxypropylene polyoxyethylene octadecyl alcohol ether, 20-30 parts of alkylphenol resin polyoxypropylene polyoxyethylene block polymer, 4-6 parts of triethanolamine, 2-4 parts of sodium dodecyl sulfate, 15-25 parts of carboxylic acid, 4-6 parts of alcohol and 14-20 parts of water. The carboxylic acid includes one or more of monochloroacetic acid, dichloroacetic acid, and trichloroacetic acid.

2. The super-thick oily acid demulsifier according to claim 1, characterized in that, The product comprises the following components by weight: 25 parts polyoxypropylene polyoxyethylene octadecyl alcohol ether, 25 parts alkylphenol resin polyoxypropylene polyoxyethylene block polymer, 5 parts triethanolamine, 3 parts sodium dodecyl sulfate, 20 parts carboxylic acid, 5 parts alcohol and 17 parts water.

3. The super-thick oily acid demulsifier according to claim 1 or 2, characterized in that, The polyoxypropylene polyoxyethylene octadecyl alcohol ether is SP-169.

4. The super-thick oily acid demulsifier according to claim 1 or 2, characterized in that, The alkylphenol resin polyoxypropylene polyoxyethylene block polymer is AR-36.

5. The super-thick oily acid demulsifier according to claim 1 or 2, characterized in that, The alcohols include one or more of methanol, ethanol, and propanol.

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