CN109294548B - Low-temperature demulsification viscosity reducer for aging oil and preparation method and application thereof - Google Patents
Low-temperature demulsification viscosity reducer for aging oil and preparation method and application thereof Download PDFInfo
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- CN109294548B CN109294548B CN201811441717.4A CN201811441717A CN109294548B CN 109294548 B CN109294548 B CN 109294548B CN 201811441717 A CN201811441717 A CN 201811441717A CN 109294548 B CN109294548 B CN 109294548B
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- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
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- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/16—Facilitating the conveyance of liquids or effecting the conveyance of viscous products by modification of their viscosity
- F17D1/17—Facilitating the conveyance of liquids or effecting the conveyance of viscous products by modification of their viscosity by mixing with another liquid, i.e. diluting
Abstract
The invention discloses a low-temperature demulsification viscosity reducer for aging oil and a preparation method and application thereof, wherein the effective components comprise triethanolamine dodecylbenzene sulfonate, fatty alcohol-polyoxyethylene ether, castor oil polyoxyethylene ether, ethylene glycol monobutyl ether, cetyl trimethyl ammonium bromide, iron sodium diethylenetriamine pentaacetic acid, an oil-soluble comb polymer and methanol, and the weight percentage of each effective component is as follows: 5-15% of triethanolamine dodecyl benzene sulfonate, 5-10% of fatty alcohol-polyoxyethylene ether, 15-30% of castor oil polyoxyethylene ether, 2-8% of ethylene glycol butyl ether, 5-15% of hexadecyl trimethyl ammonium bromide, 5-15% of diethylene triamine pentaacetic acid iron sodium, 2-8% of oil-soluble comb polymer, 15% of methanol and the balance of water.
Description
Technical Field
The invention belongs to the technical field of chemical agents for oilfield exploitation, and particularly relates to a low-temperature demulsification viscosity reducer for aging oil, and a preparation method and application thereof.
Background
In recent years, with the popularization and application of tertiary oil recovery technologies such as high water-cut period, profile control and profile control of oil displacement agent, polymer injection and oil displacement and the like of most of domestic oil fields, the aging oil which is cumulatively generated in the production process of each oil production plant every year is about 10 multiplied by 104m3Besides conventional substances such as petroleum hydrocarbons, colloid, asphaltene, wax, solid glume, inorganic salt, bacteria and the like, the modified emulsified oil also contains polymers, surfactants for oil displacement and the like, so that the treatment difficulty and the cost of the modified aged oil are increased continuously, even if the temperature is increased and the concentration of the demulsifier is increased, the dehydration rate of the modified aged oil is only about 50%, and the emulsified oil is accumulated in a settling tank and an oil removal tank in large quantity, so that the use rate of equipment of a gathering and transportation system is reduced and the operation is abnormal. From the aspects of production safety and environmental protection, how to economically and effectively treat complex emulsified oil becomes a problem to be solved urgently in oil field production.
In recent years, researchers at home and abroad have conducted a great deal of experimental studies to treat the aged oil by using new methods such as an ultrasonic treatment method, a biological treatment method, a microwave treatment method, a magnetic treatment method and the like to obtain certain effects, but the method has the defects of long treatment time, high treatment cost, incomplete dehydration of the treated aged oil and the like.
The thermochemical treatment process has the defects of poor treatment effect of the aging oil and inapplicability to production requirements, and is mainly reflected in that: firstly, the treatment effect of the aging oil is gradually poor, the dehydration cost of the crude oil is increased, and the method is not suitable for the production requirement; the quantity of transition layers is more and more, so that hidden danger is brought to stable production of the system; thirdly, the treatment effect of the prior aging oil treatment process on the middle layer of the dirty oil and the sewage in the sewage settling tank is not ideal; fourthly, the aging oil has long settling time, high dehydration temperature and higher energy consumption, and the production and operation cost is improved. The thermochemical treatment method has the action principle that aging oil is heated to a certain temperature to increase the density difference between the oil and the water and reduce the viscosity of the aging oil, and then a specific surfactant is added and fully mixed with the aging oil to destroy the original stable oil-water interface film, so that dispersed small water drops are gathered into large water drops and are precipitated and separated out under the action of the oil-water density difference; the treatment effect is seriously influenced by the type and dosage of the medicament, because no medicament formula with good effect is found at present, the crude oil still contains a small part of water and solid impurities after being treated, and the adaptability to the aging oil with complex components and difficult treatment is poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a chemical treatment method of low-temperature aging oil, and overcomes the defects of the prior art that 1: the aging oil has long treatment time and poor treatment effect; 2: the treatment cost is high, the treated aging oil is not dehydrated completely, the dehydration temperature is high, and the production and operation cost is increased; 3: the treatment dosage is large, the energy consumption is high, and the treatment effect is seriously influenced by the type and the dosage of the medicament.
In order to solve the technical problem, the technical scheme of the invention is as follows: the low-temperature demulsification viscosity reducer for the aging oil comprises the effective components of triethanolamine dodecylbenzene sulfonate, fatty alcohol-polyoxyethylene ether, castor oil polyoxyethylene ether, ethylene glycol butyl ether, cetyl trimethyl ammonium bromide, sodium iron diethylenetriamine pentaacetate, an oil-soluble comb polymer and methanol, wherein the weight percentage of each effective component is as follows: 5-15% of triethanolamine dodecyl benzene sulfonate, 5-10% of fatty alcohol-polyoxyethylene ether, 15-30% of castor oil polyoxyethylene ether, 2-8% of ethylene glycol butyl ether, 5-15% of hexadecyl trimethyl ammonium bromide, 5-15% of diethylene triamine pentaacetic acid iron sodium, 2-8% of oil-soluble comb polymer, 15% of methanol and the balance of water.
Preferably, the weight percentage of each effective component is as follows: 5-10% of triethanolamine dodecyl benzene sulfonate, 8-10% of fatty alcohol-polyoxyethylene ether, 20-25% of castor oil polyoxyethylene ether, 3-5% of ethylene glycol butyl ether, 5-10% of hexadecyl trimethyl ammonium bromide, 5-10% of diethylene triamine pentaacetic acid iron sodium, 5-8% of oil-soluble comb polymer, 15% of methanol and the balance of water.
Preferably, the weight percentage of each effective component is as follows: 10% of triethanolamine dodecyl benzene sulfonate, 8% of fatty alcohol-polyoxyethylene ether, 20% of castor oil-polyoxyethylene ether, 4% of ethylene glycol butyl ether, 7% of hexadecyl trimethyl ammonium bromide, 10% of diethylenetriamine pentaacetic acid sodium iron, 8% of oil-soluble comb polymer, 15% of methanol and 18% of water.
Preferably, the content of the active ingredient of the triethanolamine dodecylbenzene sulfonate is 60%, and the HLB value of the triethanolamine dodecylbenzene sulfonate is 8-10.
Preferably, the fatty alcohol polyoxyethylene ether is fatty alcohol polyoxyethylene ether MOA-3, wherein the content of active ingredients of the fatty alcohol polyoxyethylene ether MOA-3 is 99%, and the HLB value is 6-7.
Preferably, the castor oil polyoxyethylene ether is castor oil polyoxyethylene ether EL-10, wherein the content of active ingredients of the castor oil polyoxyethylene ether EL-10 is 99%, and the HLB value is 6-7.
Preferably, the content of the effective component of the ethylene glycol butyl ether is 99%, the content of the effective component of the cetyl trimethyl ammonium bromide is 70%, and the iron content of the diethylene triamine pentaacetic acid iron sodium is 7%.
Preferably, the oil-soluble comb polymer is oil-soluble comb polymer Basoflux PI42, and the effective component content of the methanol is 99%.
Preferably, the preparation method of the low-temperature demulsification viscosity reducer for the aged oil comprises the following steps:
step 1) adding triethanolamine dodecylbenzene sulfonate, fatty alcohol-polyoxyethylene ether, castor oil polyoxyethylene ether, ethylene glycol monobutyl ether, cetyl trimethyl ammonium bromide, sodium iron diethylenetriamine pentaacetate, an oil-soluble comb polymer and water into a reaction kettle in sequence, wherein the weight percentage of each effective component is as follows: 5-15% of triethanolamine dodecyl benzene sulfonate, 5-10% of fatty alcohol-polyoxyethylene ether, 15-30% of castor oil polyoxyethylene ether, 2-8% of ethylene glycol butyl ether, 5-15% of hexadecyl trimethyl ammonium bromide, 5-15% of diethylene triamine pentaacetic acid iron sodium, 2-8% of oil-soluble comb polymer, removing 15% of methanol, and then supplementing the balance with water;
and 2) starting a stirring device, heating to 45 ℃, stopping heating after reacting for 30 minutes, adding 15% methanol, and cooling to room temperature to obtain the low-temperature demulsification viscosity reducer for the aged oil.
Preferably, the low-temperature demulsification viscosity reducer for the aged oil is used for treating the aged oil in the crude oil production process, and is directly added into an aged oil settling tank during treatment, wherein the addition amount of the low-temperature demulsification viscosity reducer for the aged oil is 0.1-0.3% of the volume of the aged oil.
Compared with the prior art, the invention has the advantages that:
(1) the low-temperature demulsification viscosity reducer for the aging oil achieves the purpose of demulsification and dehydration by changing the HLB (hydrophile-lipophile balance) value of the aging oil by utilizing an emulsification mechanism, and simultaneously improves the coalescence rate of water particles and mechanical impurities dispersed in the emulsifying oil by utilizing the ionic surfactant, so that the demulsification efficiency of the complex emulsifying oil is improved, the dehydration rate of the aging oil at 30 ℃ can reach more than 98%, the viscosity of the aging oil is reduced by more than 84%, and the condensation point of the aging oil can be reduced by more than 10 ℃;
(2) compared with the prior art, the method has the advantages of low process requirement, short treatment time, low operation cost, good treatment effect, thorough dehydration of the treated aging oil, small treatment chemical dosage, low energy consumption and small influence of the type and dosage of the medicament on the treatment effect;
(3) the low-temperature demulsifying and viscosity reducing agent for the aging oil can effectively eliminate suspended particles caused by scale and organic matters, can quickly reduce the tension of an oil-water interface, reduce the condensation point and the viscosity of the aging oil, quickly coalesce water particles, and improve the dehydration rate of the aging oil, thereby achieving the purpose of separating oil, water and mechanical impurities of the aging oil.
Detailed Description
The following describes embodiments of the present invention with reference to examples:
it should be noted that the structures, proportions, sizes, and other elements shown in the specification are included for the purpose of understanding and reading only, and are not intended to limit the scope of the invention, which is defined by the claims, and any modifications of the structures, changes in the proportions and adjustments of the sizes, without affecting the efficacy and attainment of the same.
In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Example 1
The invention discloses a low-temperature demulsification viscosity reducer for aging oil, which comprises the following effective components in percentage by weight: 5-15% of triethanolamine dodecyl benzene sulfonate, 5-10% of fatty alcohol-polyoxyethylene ether, 15-30% of castor oil polyoxyethylene ether, 2-8% of ethylene glycol butyl ether, 5-15% of hexadecyl trimethyl ammonium bromide, 5-15% of diethylene triamine pentaacetic acid iron sodium, 2-8% of oil-soluble comb polymer, 15% of methanol and the balance of water.
Example 2
The invention discloses a low-temperature demulsification viscosity reducer for aging oil, which comprises the following effective components in percentage by weight: 5-15% of triethanolamine dodecyl benzene sulfonate, 5-10% of fatty alcohol-polyoxyethylene ether, 15-30% of castor oil polyoxyethylene ether, 2-8% of ethylene glycol butyl ether, 5-15% of hexadecyl trimethyl ammonium bromide, 5-15% of diethylene triamine pentaacetic acid iron sodium, 2-8% of oil-soluble comb polymer, 15% of methanol and the balance of water.
Preferably, the weight percentage of each effective component is as follows: 5-10% of triethanolamine dodecyl benzene sulfonate, 8-10% of fatty alcohol-polyoxyethylene ether, 20-25% of castor oil polyoxyethylene ether, 3-5% of ethylene glycol butyl ether, 5-10% of hexadecyl trimethyl ammonium bromide, 5-10% of diethylene triamine pentaacetic acid iron sodium, 5-8% of oil-soluble comb polymer, 15% of methanol and the balance of water.
Example 3
The invention discloses a low-temperature demulsification viscosity reducer for aging oil, which comprises the following effective components in percentage by weight: 5-15% of triethanolamine dodecyl benzene sulfonate, 5-10% of fatty alcohol-polyoxyethylene ether, 15-30% of castor oil polyoxyethylene ether, 2-8% of ethylene glycol butyl ether, 5-15% of hexadecyl trimethyl ammonium bromide, 5-15% of diethylene triamine pentaacetic acid iron sodium, 2-8% of oil-soluble comb polymer, 15% of methanol and the balance of water.
Preferably, the weight percentage of each effective component is as follows: 5-10% of triethanolamine dodecyl benzene sulfonate, 8-10% of fatty alcohol-polyoxyethylene ether, 20-25% of castor oil polyoxyethylene ether, 3-5% of ethylene glycol butyl ether, 5-10% of hexadecyl trimethyl ammonium bromide, 5-10% of diethylene triamine pentaacetic acid iron sodium, 5-8% of oil-soluble comb polymer, 15% of methanol and the balance of water.
Preferably, the weight percentage of each effective component is as follows: 10% of triethanolamine dodecyl benzene sulfonate, 8% of fatty alcohol-polyoxyethylene ether, 20% of castor oil-polyoxyethylene ether, 4% of ethylene glycol butyl ether, 7% of hexadecyl trimethyl ammonium bromide, 10% of diethylenetriamine pentaacetic acid sodium iron, 8% of oil-soluble comb polymer, 15% of methanol and 18% of water.
Preferably, the content of the active ingredient of the triethanolamine dodecylbenzene sulfonate is 60%, and the HLB value of the triethanolamine dodecylbenzene sulfonate is 8-10.
Preferably, the fatty alcohol polyoxyethylene ether is fatty alcohol polyoxyethylene ether MOA-3, wherein the content of active ingredients of the fatty alcohol polyoxyethylene ether MOA-3 is 99%, and the HLB value is 6-7.
Preferably, the castor oil polyoxyethylene ether is castor oil polyoxyethylene ether EL-10, wherein the content of active ingredients of the castor oil polyoxyethylene ether EL-10 is 99%, and the HLB value is 6-7.
Preferably, the content of the effective component of the ethylene glycol butyl ether is 99%, the content of the effective component of the cetyl trimethyl ammonium bromide is 70%, and the iron content of the diethylene triamine pentaacetic acid iron sodium is 7%.
Preferably, the oil-soluble comb polymer is oil-soluble comb polymer Basoflux PI42, and the effective component content of the methanol is 99%.
Example 4
The invention discloses a low-temperature demulsification viscosity reducer for aging oil, which comprises the following effective components in percentage by weight: 5-15% of triethanolamine dodecyl benzene sulfonate, 5-10% of fatty alcohol-polyoxyethylene ether, 15-30% of castor oil polyoxyethylene ether, 2-8% of ethylene glycol butyl ether, 5-15% of hexadecyl trimethyl ammonium bromide, 5-15% of diethylene triamine pentaacetic acid iron sodium, 2-8% of oil-soluble comb polymer, 15% of methanol and the balance of water.
Preferably, the weight percentage of each effective component is as follows: 5-10% of triethanolamine dodecyl benzene sulfonate, 8-10% of fatty alcohol-polyoxyethylene ether, 20-25% of castor oil polyoxyethylene ether, 3-5% of ethylene glycol butyl ether, 5-10% of hexadecyl trimethyl ammonium bromide, 5-10% of diethylene triamine pentaacetic acid iron sodium, 5-8% of oil-soluble comb polymer, 15% of methanol and the balance of water.
Preferably, the weight percentage of each effective component is as follows: 10% of triethanolamine dodecyl benzene sulfonate, 8% of fatty alcohol-polyoxyethylene ether, 20% of castor oil-polyoxyethylene ether, 4% of ethylene glycol butyl ether, 7% of hexadecyl trimethyl ammonium bromide, 10% of diethylenetriamine pentaacetic acid sodium iron, 8% of oil-soluble comb polymer, 15% of methanol and 18% of water.
Preferably, the content of the active ingredient of the triethanolamine dodecylbenzene sulfonate is 60%, and the HLB value of the triethanolamine dodecylbenzene sulfonate is 8-10.
Preferably, the fatty alcohol polyoxyethylene ether is fatty alcohol polyoxyethylene ether MOA-3, wherein the content of active ingredients of the fatty alcohol polyoxyethylene ether MOA-3 is 99%, and the HLB value is 6-7.
Preferably, the castor oil polyoxyethylene ether is castor oil polyoxyethylene ether EL-10, wherein the content of active ingredients of the castor oil polyoxyethylene ether EL-10 is 99%, and the HLB value is 6-7.
Preferably, the content of the effective component of the ethylene glycol butyl ether is 99%, the content of the effective component of the cetyl trimethyl ammonium bromide is 70%, and the iron content of the diethylene triamine pentaacetic acid iron sodium is 7%.
Preferably, the oil-soluble comb polymer is oil-soluble comb polymer Basoflux PI42, and the effective component content of the methanol is 99%.
Preferably, the preparation method of the low-temperature demulsification viscosity reducer for the aged oil comprises the following steps:
step 1) adding triethanolamine dodecylbenzene sulfonate, fatty alcohol-polyoxyethylene ether, castor oil polyoxyethylene ether, ethylene glycol monobutyl ether, cetyl trimethyl ammonium bromide, sodium iron diethylenetriamine pentaacetate, an oil-soluble comb polymer and water into a reaction kettle in sequence, wherein the weight percentage of each effective component is as follows: 5-15% of triethanolamine dodecyl benzene sulfonate, 5-10% of fatty alcohol-polyoxyethylene ether, 15-30% of castor oil polyoxyethylene ether, 2-8% of ethylene glycol butyl ether, 5-15% of hexadecyl trimethyl ammonium bromide, 5-15% of diethylene triamine pentaacetic acid iron sodium, 2-8% of oil-soluble comb polymer, removing 15% of methanol, and then supplementing the balance with water;
and 2) starting a stirring device, heating to 45 ℃, stopping heating after reacting for 30 minutes, adding 15% methanol, and cooling to room temperature to obtain the low-temperature demulsification viscosity reducer for the aged oil.
Example 5
The invention discloses a low-temperature demulsification viscosity reducer for aging oil, which comprises the following effective components in percentage by weight: 5-15% of triethanolamine dodecyl benzene sulfonate, 5-10% of fatty alcohol-polyoxyethylene ether, 15-30% of castor oil polyoxyethylene ether, 2-8% of ethylene glycol butyl ether, 5-15% of hexadecyl trimethyl ammonium bromide, 5-15% of diethylene triamine pentaacetic acid iron sodium, 2-8% of oil-soluble comb polymer, 15% of methanol and the balance of water.
Preferably, the weight percentage of each effective component is as follows: 5-10% of triethanolamine dodecyl benzene sulfonate, 8-10% of fatty alcohol-polyoxyethylene ether, 20-25% of castor oil polyoxyethylene ether, 3-5% of ethylene glycol butyl ether, 5-10% of hexadecyl trimethyl ammonium bromide, 5-10% of diethylene triamine pentaacetic acid iron sodium, 5-8% of oil-soluble comb polymer, 15% of methanol and the balance of water.
Preferably, the weight percentage of each effective component is as follows: 10% of triethanolamine dodecyl benzene sulfonate, 8% of fatty alcohol-polyoxyethylene ether, 20% of castor oil-polyoxyethylene ether, 4% of ethylene glycol butyl ether, 7% of hexadecyl trimethyl ammonium bromide, 10% of diethylenetriamine pentaacetic acid sodium iron, 8% of oil-soluble comb polymer, 15% of methanol and 18% of water.
Preferably, the content of the active ingredient of the triethanolamine dodecylbenzene sulfonate is 60%, and the HLB value of the triethanolamine dodecylbenzene sulfonate is 8-10.
Preferably, the fatty alcohol polyoxyethylene ether is fatty alcohol polyoxyethylene ether MOA-3, wherein the content of active ingredients of the fatty alcohol polyoxyethylene ether MOA-3 is 99%, and the HLB value is 6-7.
Preferably, the castor oil polyoxyethylene ether is castor oil polyoxyethylene ether EL-10, wherein the content of active ingredients of the castor oil polyoxyethylene ether EL-10 is 99%, and the HLB value is 6-7.
Preferably, the content of the effective component of the ethylene glycol butyl ether is 99%, the content of the effective component of the cetyl trimethyl ammonium bromide is 70%, and the iron content of the diethylene triamine pentaacetic acid iron sodium is 7%.
Preferably, the oil-soluble comb polymer is oil-soluble comb polymer Basoflux PI42, and the effective component content of the methanol is 99%.
Preferably, the preparation method of the low-temperature demulsification viscosity reducer for the aged oil comprises the following steps:
step 1) adding triethanolamine dodecylbenzene sulfonate, fatty alcohol-polyoxyethylene ether, castor oil polyoxyethylene ether, ethylene glycol monobutyl ether, cetyl trimethyl ammonium bromide, sodium iron diethylenetriamine pentaacetate, an oil-soluble comb polymer and water into a reaction kettle in sequence, wherein the weight percentage of each effective component is as follows: 5-15% of triethanolamine dodecyl benzene sulfonate, 5-10% of fatty alcohol-polyoxyethylene ether, 15-30% of castor oil polyoxyethylene ether, 2-8% of ethylene glycol butyl ether, 5-15% of hexadecyl trimethyl ammonium bromide, 5-15% of diethylene triamine pentaacetic acid iron sodium, 2-8% of oil-soluble comb polymer, removing 15% of methanol, and then supplementing the balance with water;
and 2) starting a stirring device, heating to 45 ℃, stopping heating after reacting for 30 minutes, adding 15% methanol, and cooling to room temperature to obtain the low-temperature demulsification viscosity reducer for the aged oil.
Preferably, the application of the low-temperature demulsification viscosity reducer for the aged oil is used, the low-temperature demulsification viscosity reducer for the aged oil is used for treating the aged oil in the crude oil production process, and the low-temperature demulsification viscosity reducer for the aged oil is directly added into an aged oil settling tank during treatment, wherein the adding amount of the low-temperature demulsification viscosity reducer for the aged oil is 0.1-0.3% of the volume of the aged oil.
Application examples
The triethanolamine dodecyl benzene sulfonate, the fatty alcohol polyoxyethylene ether MOA-3, the castor oil polyoxyethylene ether EL-10, the ethylene glycol monobutyl ether, the hexadecyl trimethyl ammonium bromide, the diethylene triamine pentaacetic acid iron sodium salt, the oil-soluble comb-shaped polymer Basoflux PI42 and the methanol are all commercially available products; wherein the triethanolamine dodecylbenzene sulfonate can effectively improve the coalescence rate among water particles in the aging oil; wherein, the fatty alcohol polyoxyethylene ether MOA-3 is easily dissolved in oil and polar solvent, is in a diffusion shape in water, has good emulsifying property, can be effectively adsorbed in crude oil, and changes the oil-water interfacial tension of aging oil; the castor oil polyoxyethylene ether EL-10 is dispersed in water, has excellent emulsifying and diffusing performances, can effectively destroy the HLB value of the aging oil, and reduces the stability of the aging oil; the ethylene glycol butyl ether can effectively eliminate emulsion formed by waxy components in the aging oil; the hexadecyl trimethyl ammonium bromide and the anion and the nonionic surfactant in the formula form a synergistic effect, so that the oil-water interfacial tension can be effectively reduced; the diethylene triamine pentaacetic acid iron sodium salt has the molecular weight of 468.2, and can effectively eliminate the content of mechanical impurities in the aging oil; the oil-soluble comb polymer Basoflux PI42 is an oil-soluble comb polymer produced by basf, and the main chain and/or the branch chain of the oil-soluble comb polymer are both provided with nonpolar parts which can be crystallized (eutectic) together with wax molecules and polar parts which can distort the crystal form of the wax crystals; the methanol mainly has the functions of reducing the condensation point of the product and improving the dispersion rate of the viscosity reducer in the aging oil.
Application example 1: adding 5 weight percent of triethanolamine dodecylbenzene sulfonate, 10 weight percent of fatty alcohol polyoxyethylene ether MOA-3, 15 weight percent of castor oil polyoxyethylene ether EL-10, 8 weight percent of ethylene glycol monobutyl ether, 5 weight percent of hexadecyl trimethyl ammonium bromide, 15 weight percent of diethylene triamine pentaacetic acid iron sodium and 2 weight percent of oil-soluble comb-shaped polymeric Basoflux PI42 into a reaction kettle in sequence, removing 15 weight percent of methanol, and then adding 25 weight percent of water; and starting a stirring device, heating to 45 ℃, stopping heating after reacting for 30 minutes, adding 15 weight percent of methanol, and cooling to room temperature to obtain the low-temperature demulsification viscosity reducer for the aged oil.
Application example 2: adding 15 weight percent of triethanolamine dodecylbenzene sulfonate, 5 weight percent of fatty alcohol polyoxyethylene ether MOA-3, 30 weight percent of castor oil polyoxyethylene ether EL-10, 2 weight percent of ethylene glycol monobutyl ether, 15 weight percent of hexadecyl trimethyl ammonium bromide, 5 weight percent of diethylene triamine pentaacetic acid iron sodium and 8 weight percent of oil-soluble comb-shaped polymeric Basoflux PI42 into a reaction kettle in sequence, removing 15 weight percent of methanol, and then adding 5 weight percent of water; and starting a stirring device, heating to 45 ℃, stopping heating after reacting for 30 minutes, adding 15 weight percent of methanol, and cooling to room temperature to obtain the low-temperature demulsification viscosity reducer for the aged oil.
Application example 3: sequentially adding 10 weight percent of triethanolamine dodecylbenzene sulfonate, 5 weight percent of fatty alcohol polyoxyethylene ether MOA-3, 30 weight percent of castor oil polyoxyethylene ether EL-10, 2 weight percent of ethylene glycol monobutyl ether, 15 weight percent of hexadecyl trimethyl ammonium bromide, 5 weight percent of diethylene triamine pentaacetic acid iron sodium and 8 weight percent of oil-soluble comb-shaped polymeric Basoflux PI42 into a reaction kettle, removing 15 weight percent of methanol, and then adding 5 weight percent of water; and starting a stirring device, heating to 45 ℃, stopping heating after reacting for 30 minutes, adding 15 weight percent of methanol, and cooling to room temperature to obtain the low-temperature demulsification viscosity reducer for the aged oil.
Application example 4: sequentially adding 10 weight percent of triethanolamine dodecylbenzene sulfonate, 8 weight percent of fatty alcohol polyoxyethylene ether MOA-3, 25 weight percent of castor oil polyoxyethylene ether EL-10, 3 weight percent of ethylene glycol monobutyl ether, 10 weight percent of hexadecyl trimethyl ammonium bromide, 10 weight percent of diethylene triamine pentaacetic acid iron sodium and 5 weight percent of oil-soluble comb-shaped polymeric Basoflux PI42 into a reaction kettle, removing 15 weight percent of methanol, and then adding 14 weight percent of water; and starting a stirring device, heating to 45 ℃, stopping heating after reacting for 30 minutes, adding 15 weight percent of methanol, and cooling to room temperature to obtain the low-temperature demulsification viscosity reducer for the aged oil.
Application example 5: adding 5 weight percent of triethanolamine dodecylbenzene sulfonate, 10 weight percent of fatty alcohol polyoxyethylene ether MOA-3, 20 weight percent of castor oil polyoxyethylene ether EL-10, 5 weight percent of ethylene glycol monobutyl ether, 5 weight percent of hexadecyl trimethyl ammonium bromide, 5 weight percent of diethylene triamine pentaacetic acid iron sodium and 8 weight percent of oil-soluble comb-shaped polymeric Basoflux PI42 into a reaction kettle in sequence, removing 15 weight percent of methanol, and then adding 27 weight percent of water; and starting a stirring device, heating to 45 ℃, stopping heating after reacting for 30 minutes, adding 15 weight percent of methanol, and cooling to room temperature to obtain the low-temperature demulsification viscosity reducer for the aged oil.
Application example 6: sequentially adding 10 weight percent of triethanolamine dodecylbenzene sulfonate, 8 weight percent of fatty alcohol polyoxyethylene ether MOA-3, 20 weight percent of castor oil polyoxyethylene ether EL-10, 4 weight percent of ethylene glycol monobutyl ether, 7 weight percent of hexadecyl trimethyl ammonium bromide, 10 weight percent of diethylene triamine pentaacetic acid iron sodium and 8 weight percent of oil-soluble comb-shaped polymeric Basoflux PI42 into a reaction kettle, removing 15 weight percent of methanol, and then adding 18 weight percent of water; and starting a stirring device, heating to 45 ℃, stopping heating after reacting for 30 minutes, adding 15 weight percent of methanol, and cooling to room temperature to obtain the low-temperature demulsification viscosity reducer for the aged oil.
And (3) carrying out performance test on the product of the application example:
test 1: performing compatibility evaluation on the aging oil of application examples 1-6 by using the low-temperature demulsification viscosity reducer, and performing dehydration rate test according to SY/T5281-2000 crude oil demulsifier use performance test method (bottle test method); according to appendix A in SY _ T6300-2009 technical conditions for the paraffin inhibitor and the paraffin inhibitor for oil recovery, performing viscosity reduction rate test by using a method for measuring the paraffin inhibitor and the viscosity reduction rate of the paraffin inhibitor for oil recovery; according to SY/T5767-2016 technical specification for transportation of pour point depressant in crude oil pipelines, a pour point depression amplitude test method is adopted to carry out a pour point depression amplitude test, the measurement temperature is 30 ℃, and the demulsification performance test result of the low-temperature demulsification viscosity reducer for the aged oil in the application examples 1-6 is shown in Table 1.
Table 1 demulsification performance test of low-temperature demulsification viscosity reducer for application examples 1-6 aged oil
As can be seen from Table 1, the viscosity and the condensation point of the aging oil are greatly reduced by adding the viscosity reducer into the aging oil, the dehydration rate of the aging oil can be effectively increased, and the water content of the crude oil is reduced.
The quality technical indexes of the invention are as follows:
appearance: is transparent and uniform liquid at normal temperature; pH value: 6-8; the dehydration rate is more than or equal to 93 percent; interfacial tension less than or equal to 5 x 10-3mN/m, the viscosity reduction rate of crude oil is more than or equal to 65%, the condensation point amplitude of the crude oil is more than or equal to 6 ℃, and the highest condensation point can reach 146 ℃.
Compared with the prior art, the viscosity reducer can effectively improve the dehydration rate of the aging oil under the low-temperature condition, reduce the energy consumption in the demulsification process, effectively eliminate the mechanical impurities in the aging oil, greatly reduce the condensation point and the viscosity of the aging oil, and ensure that the water quality and the mechanical impurities in the aging oil are more thoroughly separated, and compared with a centrifugal separation method, the viscosity reducer has the advantages that the treatment cost is reduced from 450 yuan/ton to 50 yuan/ton, and the treatment cost is greatly reduced.
The low-temperature demulsification viscosity reducer for the aging oil achieves the purpose of demulsification and dehydration by changing the HLB (hydrophile-lipophile balance) value of the aging oil by utilizing an emulsification mechanism, and simultaneously improves the coalescence rate of water particles and mechanical impurities dispersed in the emulsifying oil by utilizing the ionic surfactant, so that the demulsification efficiency of the complex emulsifying oil is improved, the dehydration rate of the aging oil at 30 ℃ can reach more than 98%, the viscosity of the aging oil is reduced by more than 84%, and the condensation point of the aging oil can be reduced by more than 10 ℃.
Compared with the prior art, the method has the advantages of low process requirement, short treatment time, low operation cost, good treatment effect, thorough dehydration of the treated aging oil, small treatment chemical dosage, low energy consumption and small influence of the type and dosage of the medicament on the treatment effect.
The low-temperature demulsifying and viscosity reducing agent for the aging oil can effectively eliminate suspended particles caused by scale and organic matters, can quickly reduce the tension of an oil-water interface, reduce the condensation point and the viscosity of the aging oil, quickly coalesce water particles, and improve the dehydration rate of the aging oil, thereby achieving the purpose of separating oil, water and mechanical impurities of the aging oil.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, but only by the scope of the appended claims.
Claims (10)
1. A low-temperature demulsification viscosity reducer for aging oil is characterized in that: the active ingredients comprise triethanolamine dodecylbenzene sulfonate, fatty alcohol-polyoxyethylene ether, castor oil polyoxyethylene ether, ethylene glycol monobutyl ether, hexadecyl trimethyl ammonium bromide, diethylene triamine pentaacetic acid iron sodium, oil-soluble comb polymer Basoflux PI42 and methanol, wherein the weight percentage of each active ingredient is as follows: 5-15% of triethanolamine dodecyl benzene sulfonate, 5-10% of fatty alcohol-polyoxyethylene ether, 15-30% of castor oil polyoxyethylene ether, 2-8% of ethylene glycol butyl ether, 5-15% of hexadecyl trimethyl ammonium bromide, 5-15% of diethylene triamine pentaacetic acid iron sodium, 422-8% of oil-soluble comb polymer Basoflux, 15% of methanol and the balance of water.
2. The low-temperature demulsification viscosity reducer for the aged oil as claimed in claim 1, wherein: the weight percentage of each effective component is as follows: 5-10% of triethanolamine dodecyl benzene sulfonate, 8-10% of fatty alcohol-polyoxyethylene ether, 20-25% of castor oil polyoxyethylene ether, 3-5% of ethylene glycol butyl ether, 5-10% of hexadecyl trimethyl ammonium bromide, 5-10% of diethylene triamine pentaacetic acid iron sodium, 425-8% of oil-soluble comb polymer Basoflux PI, 15% of methanol and the balance of water.
3. The low-temperature demulsification viscosity reducer for the aged oil as claimed in claim 2, wherein: the weight percentage of each effective component is as follows: 10% of triethanolamine dodecyl benzene sulfonate, 8% of fatty alcohol-polyoxyethylene ether, 20% of castor oil polyoxyethylene ether, 4% of ethylene glycol butyl ether, 7% of hexadecyl trimethyl ammonium bromide, 10% of diethylene triamine pentaacetic acid iron sodium salt, 428% of oil-soluble comb polymer Basoflux, 15% of methanol and 18% of water.
4. The low-temperature demulsification viscosity reducer for the aged oil as claimed in claim 3, wherein: the content of the active ingredients of the triethanolamine dodecylbenzene sulfonate is 60%, and the HLB value of the triethanolamine dodecylbenzene sulfonate is 8-10.
5. The low-temperature demulsification viscosity reducer for the aged oil as claimed in claim 3, wherein: the fatty alcohol-polyoxyethylene ether is fatty alcohol-polyoxyethylene ether MOA-3, wherein the content of active ingredients of the fatty alcohol-polyoxyethylene ether MOA-3 is 99%, and the HLB value is 6-7.
6. The low-temperature demulsification viscosity reducer for the aged oil as claimed in claim 3, wherein: the castor oil polyoxyethylene ether is castor oil polyoxyethylene ether EL-10, wherein the content of active ingredients of the castor oil polyoxyethylene ether EL-10 is 99%, and the HLB value is 6-7.
7. The low-temperature demulsification viscosity reducer for the aged oil as claimed in claim 3, wherein: the content of the effective component of the ethylene glycol butyl ether is 99%, the content of the effective component of the cetyl trimethyl ammonium bromide is 70%, and the iron content of the diethylene triamine pentaacetic acid iron sodium is 7%.
8. The low-temperature demulsification viscosity reducer for the aged oil as claimed in claim 3, wherein: the content of the effective component of the methanol is 99 percent.
9. The preparation method of the low-temperature demulsification viscosity reducer for the aged oil as claimed in any one of claims 1 to 8, which is characterized by comprising the following steps:
step 1) adding triethanolamine dodecyl benzene sulfonate, fatty alcohol-polyoxyethylene ether, castor oil polyoxyethylene ether, ethylene glycol monobutyl ether, cetyl trimethyl ammonium bromide, diethylene triamine pentaacetic acid iron sodium salt, oil-soluble comb polymer Basoflux PI42 and water into a reaction kettle in sequence;
and 2) starting a stirring device, heating to 45 ℃, stopping heating after reacting for 30 minutes, then adding methanol, and cooling to room temperature to obtain the low-temperature demulsification viscosity reducer for the aged oil.
10. The application of the low-temperature demulsification viscosity reducer for the aged oil as claimed in any one of claims 1 to 8, wherein the low-temperature demulsification viscosity reducer comprises the following components in percentage by weight: the low-temperature demulsification viscosity reducer for the aging oil is used for treating the aging oil in the crude oil production process, and is directly added into an aging oil settling tank during treatment, wherein the addition amount of the low-temperature demulsification viscosity reducer for the aging oil is 0.1-0.3% of the volume of the aging oil.
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| CN113667465A (en) * | 2021-08-04 | 2021-11-19 | 中国石油天然气股份有限公司 | Surfactant for improving recovery ratio based on static emulsification and preparation method thereof |
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