CN113025440B - Low-tension foam oil washing agent and preparation method and application thereof - Google Patents
Low-tension foam oil washing agent and preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/72—Ethers of polyoxyalkylene glycols
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/662—Carbohydrates or derivatives
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/0005—Other compounding ingredients characterised by their effect
- C11D3/0026—Low foaming or foam regulating compositions
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2003—Alcohols; Phenols
- C11D3/2006—Monohydric alcohols
- C11D3/201—Monohydric alcohols linear
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2003—Alcohols; Phenols
- C11D3/2006—Monohydric alcohols
- C11D3/2017—Monohydric alcohols branched
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/34—Organic compounds containing sulfur
- C11D3/3409—Alkyl -, alkenyl -, cycloalkyl - or terpene sulfates or sulfonates
Abstract
The invention provides a low-tension foam oil washing agent, and a preparation method and application thereof, and belongs to the field of oilfield chemistry. The low-tension foam oil washing agent comprises, by mass, 25% -30% of alcohol ether sulfonate, 10% -20% of fatty alcohol-polyoxyethylene ether glucoside, 20% -25% of alpha-alkenyl sulfonate, 10% of low-carbon alcohol and the balance of water. The foam oil washing agent provided by the invention has good oil washing efficiency while meeting the established characteristics of a low-tension foam agent, and can improve the sweep efficiency and the oil washing efficiency in actual field application, thereby achieving the purpose of one agent and double effects and greatly improving the crude oil recovery ratio.
Description
Technical Field
The invention belongs to the field of oilfield chemistry, and particularly relates to a low-tension foam oil washing agent, and a preparation method and application thereof.
Background
At present, many oil fields in China enter the middle and later stages of development, and although the extraction degree of most oil fields is greatly improved through primary and secondary oil extraction, crude oil occupying about 2/3 of geological reserves is still left in the stratum. In recent years, the difficulty of exploring new reserves is getting higher and higher, the cost is getting higher and higher, and the further improvement of the recovery ratio of the discovered and developed reserves is very urgent work.
The enhanced recovery factor mainly depends on two factors, namely enhanced sweep efficiency and oil washing efficiency. The traditional foaming agent mainly focuses on the blocking capacity of foam (the sweep efficiency is improved), but the improvement of the oil washing efficiency also has important significance for improving the recovery ratio. In order to improve the recovery efficiency to a greater extent, the advantages of foam flooding and low-tension combined flooding are combined to form a novel oil displacement technology which has the advantages of high apparent viscosity of foam flooding, water and oil plugging resistance and super-strong oil washing capacity of low-tension surfactant flooding, and therefore, the low-tension foam oil washing agent suitable for the technology is urgently needed to be provided.
Disclosure of Invention
The invention provides a low-tension foam oil washing agent and a preparation method and application thereof, the foam oil washing agent has good oil washing efficiency while meeting the established characteristics of the low-tension foam agent, and can improve the sweep efficiency and the oil washing efficiency in actual field application, thereby achieving the purpose of one agent and double effects and greatly improving the crude oil recovery ratio.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a low-tension foam oil washing agent which comprises, by mass, 25-30% of alcohol ether sulfonate, 10-20% of fatty alcohol-polyoxyethylene ether glucoside, 20-25% of alpha-olefin sulfonate, 10% of low-carbon alcohol and the balance of water.
In the above technical solution, a person skilled in the art may adjust the ranges of the above components according to actual field conditions, for example, the alcohol ether sulfonate may be 26%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29%, 29.5% or any value within the above ranges, the fatty alcohol polyoxyethylene ether glucoside may be 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19% or any value within the above ranges, and the α -alkenyl sulfonate may be 21%, 21.5%, 22%, 22.5%, 23%, 23.5%, 24%, 24.5% or any value within the above ranges.
The invention provides a low-tension foam oil washing agent, wherein the compounding ratio of a formula is determined on the basis of a large number of experiments in a laboratory, the compounding ratio provided by the invention is in an optimal ratio range, and the technical indexes are unqualified due to the absence of any component or the use amount of each component exceeding or falling below the range, particularly the interfacial tension and the half-life period of foam are caused by the synergistic interaction of each component.
Preferably, the alcohol ether sulfonate is isomeric tridecanol polyoxyethylene ether sulfonate, and the molecular formula is as follows:
wherein n is 3 or 4.
Preferably, the molecular formula of the fatty alcohol polyoxyethylene ether glucoside is as follows:
(C6H11O5)m(CH2CH2O)sOR1，
wherein R is1Is an alkyl group having 12 to 14 carbons, m is 2 or 3, and s is 3 or 4. It is understood that R1There may be alkyl groups having 12, 13, 14 carbons.
Preferably, the α -olefin sulfonate has the formula:
R2-CH＝CH-(CH2)t-SO3M，
wherein R is2Is alkyl with 9-13 carbons, t is any integer from 1-3, M is selected from Na+、K+、NH4 +Any one of (1). It is understood that R2Can be an alkane having 9, 10, 11, 12, 13 carbonsN may be 1, 2 or 3.
Preferably, the α -olefin sulfonate is an unsaturated alkyl sulfonate having 12 to 18 carbon atoms in a hydrophobic chain. It is understood that the number of carbon atoms of the alpha-olefin sulfonate may be any integer of 12, 13, 14, 15, 16, 17, 18.
Preferably, the lower alcohol is at least one of methanol, ethanol and isopropanol.
Preferably, the interface tension between the water phase and crude oil is less than 3.2X 10 when the water phase is compatible with the water phase with the mineralization degree of 0-100000mg/L and the total concentration of calcium ions and magnesium ions of 0-2000mg/L-3mN/m, the foaming volume is more than 815mL, the foam half-life period is more than 124min, and the oil washing rate is more than 91.5%.
The invention provides a preparation method of a low-tension foam oil washing agent according to any one technical scheme, which comprises the following steps:
adding the water amount required by preparing the low-tension foam oil washing agent into a reaction kettle, adding alcohol ether sulfonate at the temperature of 50-60 ℃, and stirring, dissolving and uniformly mixing;
and then adding fatty alcohol-polyoxyethylene ether glucoside and low-carbon alcohol, stirring and mixing uniformly, adding alpha-alkenyl sulfonate, stirring and mixing uniformly to obtain the low-tension foam oil washing agent.
The preparation method of the low-tension foam oil washing agent is established on the basis of easy operation and time saving, and because the concentration of the alcohol ether sulfonate is high and the dissolution is slightly difficult, the alcohol ether sulfonate is dissolved in water firstly, then the fatty alcohol-polyoxyethylene ether glucoside and the low-carbon alcohol are added, and finally the alpha-alkenyl sulfonate is added, so that the excessive foam generated in the preparation process is prevented from escaping from a preparation container.
The invention provides an application of the low-tension foam oil washing agent according to any one of the technical schemes in oil reservoir foam flooding or foam plugging, wherein the stratum water salinity is 0-100000mg/L, and the concentration of calcium and magnesium ions is less than 2000 mg/L.
Preferably, the low tension foam oil detergent is used at a concentration of 0.5 wt%.
Compared with the prior art, the invention has the advantages and positive effects that:
1. the fatty alcohol-polyoxyethylene ether glucoside in the low-tension foam oil washing agent provided by the invention is a novel nonionic surfactant, has a good foaming volume and a good foam half-life period, can be obviously improved after being compounded with a foaming main agent alpha-alkenyl sulfonate, and has good oil washing capacity. Meanwhile, by compounding with the polyether sulfonate, the oil-water interfacial tension of the system can be reduced to be ultralow under the condition of ensuring the performance of foam, the number of capillary tubes is increased, the crude oil is easier to flow, and the oil displacement efficiency is further improved.
2. The low-tension foam oil washing agent provided by the invention can greatly improve swept volume under the action of nitrogen, and can also improve oil washing efficiency to achieve the purpose of one agent and double effects, so that the recovery ratio of crude oil can be greatly improved, and the interfacial tension between the low-tension foam oil washing agent and the crude oil is less than 3.2 multiplied by 10-3mN/m, the foaming volume is more than 815mL, the foam half-life period is more than 124min, and the oil washing rate is more than 91.5%.
3. The low-tension foam oil washing agent provided by the invention is simple in production process, easily available in raw materials, harmless to the environment and personnel from production to use, and in line with the requirements of environmental protection.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The products prepared in the following examples and comparative examples were formulated to a concentration of 0.5wt% for performance testing under the following test conditions and test methods:
and (3) testing conditions are as follows:
testing an instrument: TX-500C model full-range rotary drop interfacial tension measuring instrument, 2152 improved Ross-Miles foam instrument, constant temperature drying oven and super constant temperature water bath.
And (3) testing temperature: the interfacial tension test and the oil wash rate test were measured at a reservoir temperature of 60 ℃.
Test oil: the method can be used for overcoming the condition that the crude oil is dehydrated in a certain area of the oil field.
Test water: water is injected into a certain block of the Shengli oil field, the mineralization degree is 100000mg/L, and the concentration of calcium and magnesium ions is 2000 mg/L.
The test method comprises the following steps:
1. preparing a test solution: the low-tension foam oil-washing agent prepared by the method is prepared into an aqueous solution with the concentration of 0.5wt% by using injection water in a certain block of a Shengli oil field.
2. And (3) measuring the foam performance: the test was carried out according to GB/T7462-1994 modified Ross-Miles method, determination of foaming power of surfactants, using the test solution prepared above.
3. And (3) interfacial tension measurement: the interfacial tension between the test solution and the target block oil sample was measured at 60 ℃ as specified in SY/T5370-2018 at 7.3.4 (rotation speed 5000r/min, density difference calculated as 0.1), and the lowest value of the interfacial tension was recorded.
4. And (3) oil washing rate determination:
4.1 mixing the simulated formation sand with the crude oil of the target block according to the mass ratio of 4:1, putting the mixture into a constant-temperature drying box, aging the mixture for 7 days at the oil reservoir temperature, and stirring the mixture for 1 time every day to uniformly mix the oil sand.
4.2 injecting water into the target block to prepare 100g of 0.3% sample solution, and stirring the sample solution on a magnetic stirrer at the rotating speed of 300r/min for 15min to be tested.
4.3 weigh about 5g of aged oil sands into a 100mL Erlenmeyer flask and weigh m1To the nearest 0.001 g.
4.4 adding 50g of the prepared sample solution into the 3.3 sample, fully mixing, and standing for 48h at the oil reservoir temperature.
4.5 dipping the crude oil floating in the sample solution after standing by 3.4 and the crude oil adhered to the bottle wall out by clean cotton yarn, pouring out the sample solution, putting the conical flask in a drying oven at 105 ℃ to be dried to constant weight to obtain m2。
4.6 crude oil elution was performed on the sample in 3.5 with petroleum ether until the petroleum ether was colorless. Placing the conical flask with the crude oil completely eluted in a 120 ℃ oven to be dried to constant weight, and weighing to obtain m3。
4.7 oil wash was calculated as follows:
σ＝(m1-m2)/(m1-m3)ⅹ100％
in the formula:
sigma-wash oil rate;
m1the total mass of the erlenmeyer flask and the oil sand before washing the oil, g;
m2the mass of the erlenmeyer flask and the oil sand after oil washing, g;
m3total mass of erlenmeyer flask and washed formation sand, g.
Example 1
Adding 200kg of water into a reaction kettle, controlling the temperature to be 60 ℃, adding 300kg of isomeric tridecanol polyoxyethylene ether sulfonate (n is 3), stirring, dissolving and uniformly mixing; 200kg of fatty alcohol polyoxyethylene ether glucoside (R) are subsequently added112, m 2, s 3 and 100kg of methanol, and 200kg of an α -olefin sulfonate (R) was added thereto after uniformly mixing the mixture with stirring2And (9) and t is 2), and stirring and uniformly mixing to obtain the low-tension foam oil washing agent.
Example 2
Adding 220kg of water into a reaction kettle, controlling the temperature to be 58 ℃, adding 290kg of isomeric tridecanol polyoxyethylene ether sulfonate (n is 4), stirring, dissolving and uniformly mixing; 180kg of fatty alcohol polyoxyethylene ether glucoside (R) are subsequently added113, m-2, s-4 and 100kg of ethanol were mixed with stirring, and 210kg of α -olefin sulfonate (R) was added thereto2And (4) stirring and uniformly mixing the components 10 and 3) to obtain the low-tension foam oil washing agent.
Example 3
Adding 240kg of water into a reaction kettle, controlling the temperature to be 56 ℃, adding 280kg of isomeric tridecanol polyoxyethylene ether sulfonate (n is 3), stirring, dissolving and uniformly mixing; 160kg of fatty alcohol polyoxyethylene ether glucoside (R) are subsequently added114, m-2, s-3 and 100kg of isopropanol were mixed with stirring, and 220kg of an α -olefin sulfonate (R) was added thereto213 and t is 1), and stirring and mixing uniformly to obtain the low-tension foam oil washing agent.
Example 4
260kg of water is added into a reaction kettle, the temperature is controlled at 54 ℃, and 270kg of isomeric tridecanol polymer is addedStirring, dissolving and uniformly mixing the polyoxyethylene ether sulfonate (n is 4); 140kg of fatty alcohol polyoxyethylene ether glucoside (R) are subsequently added112, m-3, s-4, 50kg of methanol and 50kg of ethanol were mixed with stirring, and then 230kg of α -olefin sulfonate (R) was added thereto212 and t 2), and uniformly stirring to obtain the low-tension foam oil washing agent.
Example 5
Adding 280kg of water into a reaction kettle, controlling the temperature to be 52 ℃, adding 260kg of isomeric tridecanol polyoxyethylene ether sulfonate (n is 3), stirring, dissolving and uniformly mixing; 120kg of fatty alcohol polyoxyethylene ether glucoside (R) are subsequently added113, m-3, s-3, 50kg of methanol and 50kg of isopropanol were mixed with stirring, and 240kg of α -alkenylsulfonate (R) was added thereto2And (3) stirring and uniformly mixing the components until t is 2 and 11), thus obtaining the low-tension foam oil washing agent.
Example 6
Adding 300kg of water into a reaction kettle, controlling the temperature to be 50 ℃, adding 250kg of isomeric tridecanol polyoxyethylene ether sulfonate (n is 4), stirring, dissolving and uniformly mixing; 100kg of fatty alcohol polyoxyethylene ether glucoside (R) are subsequently added114, m-3, s-4, 50kg of ethanol and 50kg of isopropanol, and after stirring and mixing, 250kg of α -alkenylsulfonate (R) was added2And (9) and (t) is 3), and uniformly stirring to obtain the low-tension foam oil washing agent.
The components and the proportion of the low-tension foam oil washing agent provided by the invention are determined on the basis of a large number of experiments, and any change can cause unqualified detection indexes.
Comparative example 1
550kg of water is added into a reaction kettle, the temperature is controlled at 50 ℃, and 100kg of fatty alcohol polyoxyethylene ether glucoside (R) is added114, m-3, s-4, 50kg of ethanol and 50kg of isopropanol were mixed with stirring, and 250kg of α -alkenylsulfonate (R) was added thereto2And (9) and (t) is 3), and uniformly stirring to obtain the low-tension foam oil washing agent.
Comparative example 1 is a low-tension foam oil washing agent obtained by removing the isomeric tridecanol polyoxyethylene ether sulfonate in the formula of example 6, the amount of the isomeric tridecanol polyoxyethylene ether sulfonate is supplemented by water, and the interfacial tension, the foaming volume, the half-life period and the oil washing rate do not reach the standard.
Comparative example 2
Adding 400kg of water into a reaction kettle, controlling the temperature to be 50 ℃, adding 250kg of isomeric tridecanol polyoxyethylene ether sulfonate (n is 4), stirring, dissolving and uniformly mixing; then 50kg ethanol and 50kg isopropanol were added, and after stirring and mixing well 250kg alpha-olefin sulfonate (R) was added2And (9) and (t) is 3), and uniformly stirring to obtain the low-tension foam oil washing agent.
Comparative example 2 is a low-tension foam oil-washing agent obtained by removing fatty alcohol-polyoxyethylene ether glucoside in the formulation of example 6, the amount of fatty alcohol-polyoxyethylene ether glucoside is supplemented with water, and the interfacial tension, the foaming volume, the half-life period and the oil-washing rate do not reach the standard.
Comparative example 3
Adding 550kg of water into a reaction kettle, controlling the temperature to be 50 ℃, adding 250kg of isomeric tridecanol polyoxyethylene ether sulfonate (n is 4), stirring, dissolving and uniformly mixing; 100kg of fatty alcohol polyoxyethylene ether glucoside (R) are subsequently added114, m is 3, s is 4), 50kg of ethanol and 50kg of isopropanol, and the mixture is uniformly stirred to obtain the low-tension foam oil washing agent.
Comparative example 3 is a low tension foam oil cleaning agent obtained by removing the alpha-olefin sulfonate in the formulation of example 6, the amount of the alpha-olefin sulfonate is supplemented with water, and the interfacial tension, the foaming volume, the half-life period and the oil cleaning rate do not reach the standard.
Comparative example 4
Adding 240kg of water into a reaction kettle, controlling the temperature to be 50 ℃, adding 310kg of isomeric tridecanol polyoxyethylene ether sulfonate (n is 4), stirring, dissolving and uniformly mixing; 100kg of fatty alcohol polyoxyethylene ether glucoside (R) are subsequently added114, m-3, s-4, 50kg of ethanol and 50kg of isopropanol were mixed with stirring, and 250kg of α -alkenylsulfonate (R) was added thereto2And (9) and (t) is 3), and uniformly stirring to obtain the low-tension foam oil washing agent.
Comparative example 4 is the isomeric tridecanol polyoxyethylene ether sulfonate in the formulation of example 6 is out of the range of 25% -30%, namely, a low-tension foam oil washing agent is obtained by adding 310kg of isomeric tridecanol polyoxyethylene ether sulfonate (31%), the excessive isomeric tridecanol polyoxyethylene ether sulfonate is removed from water, and the interfacial tension, the foaming volume, the half-life period and the oil washing rate do not reach the standard.
Comparative example 5
Adding 310kg of water into a reaction kettle, controlling the temperature to be 50 ℃, adding 240kg of isomeric tridecanol polyoxyethylene ether sulfonate (n is 4), stirring, dissolving and uniformly mixing; 100kg of fatty alcohol polyoxyethylene ether glucoside (R) are subsequently added114, m-3, s-4, 50kg of ethanol and 50kg of isopropanol, and after stirring and mixing, 250kg of α -alkenylsulfonate (R) was added29 and t is 3), and stirring and mixing evenly to obtain the low-tension foam oil washing agent.
Comparative example 5 is the isomeric tridecanol polyoxyethylene ether sulfonate in the formulation of example 6 is deviated from the range of 25% -30%, namely, 240kg of isomeric tridecanol polyoxyethylene ether sulfonate (24%) is added to obtain the low-tension foam oil washing agent, the amount of the isomeric tridecanol polyoxyethylene ether sulfonate which is less added is supplemented with water, and the interfacial tension, the foaming volume, the half-life period and the oil washing rate do not reach the standard.
Comparative example 6
Adding 190kg of water into a reaction kettle, controlling the temperature to be 50 ℃, adding 250kg of isomeric tridecanol polyoxyethylene ether sulfonate (n is 4), stirring, dissolving and uniformly mixing; 210kg of fatty alcohol polyoxyethylene ether glucoside (R) are subsequently added114, m-3, s-4, 50kg of ethanol and 50kg of isopropanol, and after stirring and mixing, 250kg of α -alkenylsulfonate (R) was added2And (9) and (t) is 3), and uniformly stirring to obtain the low-tension foam oil washing agent.
Comparative example 6 is the fatty alcohol polyoxyethylene ether glucoside in the formulation of example 6 is out of the range of 10% -20%, namely a low-tension foam oil washing agent obtained by adding 210kg of fatty alcohol polyoxyethylene ether glucoside (21%) is added, the excessive amount of fatty alcohol polyoxyethylene ether glucoside is removed from water, and the interfacial tension, the foaming volume, the half-life period and the oil washing rate do not reach the standard.
Comparative example 7
Adding 310kg of water into a reaction kettle, controlling the temperature to be 50 ℃, adding 250kg of isomeric tridecanol polyoxyethylene ether sulfonate (n is 4), stirring, dissolving and uniformly mixing; 90kg of fatty alcohol polyoxyethylene ether glucoside (R) are subsequently added1＝14，m＝3，s-4) and 50kg of ethanol and 50kg of isopropanol, and adding 250kg of alpha-olefin sulfonate (R) after uniformly stirring2And (9) and (t) is 3), and uniformly stirring to obtain the low-tension foam oil washing agent.
Comparative example 7 is the fatty alcohol polyoxyethylene ether glucoside in the formulation of example 6 was out of the range of 10% -20%, i.e. 90kg of a low-tension foam oil-washing agent obtained from fatty alcohol polyoxyethylene ether glucoside (9%) was added, the amount of the fatty alcohol polyoxyethylene ether glucoside added was supplemented with water, and the interfacial tension, the foaming volume, the half-life and the oil-washing rate did not reach the standards.
Comparative example 8
Adding 290kg of water into a reaction kettle, controlling the temperature to be 50 ℃, adding 250kg of isomeric tridecanol polyoxyethylene ether sulfonate (n is 4), stirring, dissolving and uniformly mixing; 100kg of fatty alcohol polyoxyethylene ether glucoside (R) are subsequently added114, m-3, s-4, 50kg of ethanol and 50kg of isopropanol were mixed with stirring, and 260kg of α -alkenylsulfonate (R) was added thereto2And (9) and (t) is 3), and uniformly stirring to obtain the low-tension foam oil washing agent.
Comparative example 8 a low tension foam oil wash obtained with 260kg of alpha-olefin sulfonate (26%) in the formulation of example 6, with the alpha-olefin sulfonate exceeding the 20% -25% range, the added amount of alpha-olefin sulfonate was removed from the water and the interfacial tension, bubble volume, half-life and oil wash did not meet the standards.
Comparative example 9
Adding 360kg of water into a reaction kettle, controlling the temperature to be 50 ℃, adding 250kg of isomeric tridecanol polyoxyethylene ether sulfonate (n is 4), stirring, dissolving and uniformly mixing; 100kg of fatty alcohol polyoxyethylene ether glucoside (R) are subsequently added114, m-3, s-4, 50kg of ethanol and 50kg of isopropanol were mixed with stirring, 190kg of α -alkenylsulfonate (R) was added thereto2And (9) and (t) is 3), and uniformly stirring to obtain the low-tension foam oil washing agent.
Comparative example 9 is a low tension foam oil wash obtained by adding 190kg of alpha-olefin sulfonate (19%) in the formulation of example 6, wherein the alpha-olefin sulfonate deviates from the range of 20-25%, the amount of the alpha-olefin sulfonate added is supplemented with water, and the interfacial tension, the foaming volume, the half-life and the oil wash rate do not reach the standard.
Comparative example 10
Comparative example 10 was a manufacturer's low tension foam model DLF-1 retrieved from the application site.
Comparative example 11
Comparative example 11 was a manufacturer's foam formulation, model DP-4, retrieved from the application site.
Performance testing
The low tension foam oil detergents obtained in examples 1 to 6 and comparative examples 1 to 11 were subjected to the tests of interfacial tension, foaming volume, half-life and oil washing efficiency according to the test methods described above, and the test results are shown in Table 1. Interfacial tension with crude oil < 5X 10-3mN/m, the foaming volume is more than 800mL, the foam half-life period is more than 120min, and the oil washing rate is more than 90 percent.
TABLE 1 Performance testing of Low tension foam oil detergents
As can be seen from the table 1, the formula provided by the application can enable the obtained low-tension foam oil washing agent to have the characteristics of ultralow interfacial tension, good foam performance, high oil washing efficiency and the like under the synergistic action of the alcohol ether sulfonate, the polyether glucoside and the alpha-alkenyl sulfonate, particularly under the action of nitrogen, the swept volume can be greatly improved, the oil washing efficiency can be improved, and the interfacial tension between the oil washing agent and crude oil is less than 3.2 multiplied by 10-3mN/m, the foaming volume is more than 815mL, the foam half-life period is more than 124min, and the oil washing rate is more than 91.5 percent, thereby achieving the purpose of one dose of double effects. Indoor physical model displacement experiments prove that the recovery ratio of the crude oil is improved to exceed that of the conventional foam flooding and low-tension foam flooding. If a component is missing or the amount of the component used is not within the range defined by the present invention, the detected index is affected, and the component is rejected.
Claims (5)
1. The low-tension foam oil washing agent is characterized by comprising, by mass, 25-30% of alcohol ether sulfonate, 10-20% of fatty alcohol-polyoxyethylene ether glucoside, 20-25% of alpha-olefin sulfonate, 10% of low-carbon alcohol and the balance of water;
the alcohol ether sulfonate is isomeric tridecanol polyoxyethylene ether sulfonate, and the molecular formula is as follows:
wherein n is 3 or 4;
the molecular formula of the fatty alcohol polyoxyethylene ether glucoside is as follows:
(C6H11O5)m(CH2CH2O)sOR1，
wherein R is1Is alkyl having 12 to 14 carbons, m is 2 or 3, s is 3 or 4;
the alpha-olefin sulfonate has the following molecular formula:
R2-CH=CH-(CH2)t-SO3M，
wherein R is2Is alkyl with 9-13 carbons, t is any integer from 1-3, M is selected from Na+、K+、NH4 +Any one of the cations of (a);
when the low-tension foam oil washing agent is compatible with water with the mineralization degree of 0-100000mg/L and the total concentration of calcium ions and magnesium ions of 0-2000mg/L, the interfacial tension between the low-tension foam oil washing agent and crude oil is less than 3.2 multiplied by 10-3mN/m, the foaming volume is more than 815mL, the foam half-life period is more than 124min, and the oil washing rate is more than 91.5%.
2. The low tension foam oil detergent according to claim 1, wherein the low carbon alcohol is at least one of methanol, ethanol, and isopropanol.
3. A method for preparing a low tension foam oil washing agent according to any one of claims 1-2, characterized by comprising the steps of:
adding the water amount required by preparing the low-tension foam oil washing agent into a reaction kettle, adding alcohol ether sulfonate at the temperature of 50-60 ℃, and stirring, dissolving and uniformly mixing;
and then adding fatty alcohol-polyoxyethylene ether glucoside and low-carbon alcohol, stirring and mixing uniformly, adding alpha-alkenyl sulfonate, stirring and mixing uniformly to obtain the low-tension foam oil washing agent.
4. The application of the low-tension foam oil washing agent in reservoir foam flooding or foam plugging, wherein the salinity of formation water is 0-100000mg/L, and the concentration of calcium and magnesium ions is less than 2000 mg/L.
5. The use according to claim 4, wherein the low tension foam oil wash is used at a concentration of 0.5 wt%.
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| CN114774098B (en) * | 2022-05-27 | 2023-07-21 | 山东新港化工有限公司 | Thickened oil viscosity-reducing oil washing agent for synergistic polymer flooding and preparation method and application thereof |
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