CN113621358A - Viscosity-reducing oil displacement agent for extra-thick crude oil and preparation method and application thereof - Google Patents
Viscosity-reducing oil displacement agent for extra-thick crude oil and preparation method and application thereof Download PDFInfo
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- 239000003921 oil Substances 0.000 title claims abstract description 82
- 239000010779 crude oil Substances 0.000 title claims abstract description 56
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 40
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 27
- 239000003945 anionic surfactant Substances 0.000 claims abstract description 23
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 14
- 238000011084 recovery Methods 0.000 claims abstract description 8
- 239000002888 zwitterionic surfactant Substances 0.000 claims abstract description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 28
- 239000002280 amphoteric surfactant Substances 0.000 claims description 19
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 10
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 9
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 9
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- YWFWDNVOPHGWMX-UHFFFAOYSA-N n,n-dimethyldodecan-1-amine Chemical compound CCCCCCCCCCCCN(C)C YWFWDNVOPHGWMX-UHFFFAOYSA-N 0.000 claims description 4
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims description 3
- -1 hydroxyethyl ammonium oxide Chemical compound 0.000 claims description 3
- SFBHPFQSSDCYSL-UHFFFAOYSA-N n,n-dimethyltetradecan-1-amine Chemical compound CCCCCCCCCCCCCCN(C)C SFBHPFQSSDCYSL-UHFFFAOYSA-N 0.000 claims description 3
- GSWAOPJLTADLTN-UHFFFAOYSA-N oxidanimine Chemical compound [O-][NH3+] GSWAOPJLTADLTN-UHFFFAOYSA-N 0.000 claims description 3
- 229920001451 polypropylene glycol Polymers 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000003760 tallow Substances 0.000 claims description 3
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 42
- 238000002474 experimental method Methods 0.000 description 32
- 230000000052 comparative effect Effects 0.000 description 25
- 239000002671 adjuvant Substances 0.000 description 6
- 239000000295 fuel oil Substances 0.000 description 6
- 238000011056 performance test Methods 0.000 description 6
- 239000004094 surface-active agent Substances 0.000 description 6
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000002736 nonionic surfactant Substances 0.000 description 4
- 229910052938 sodium sulfate Inorganic materials 0.000 description 4
- 235000011152 sodium sulphate Nutrition 0.000 description 4
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 3
- 125000000129 anionic group Chemical group 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 2
- 238000010795 Steam Flooding Methods 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000004945 emulsification Methods 0.000 description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000007764 o/w emulsion Substances 0.000 description 2
- KEFJJXAABZFJSU-UHFFFAOYSA-N 2-hydroxy-n-(2-hydroxyethyl)ethanamine oxide Chemical compound OCC[NH+]([O-])CCO KEFJJXAABZFJSU-UHFFFAOYSA-N 0.000 description 1
- BWDBEAQIHAEVLV-UHFFFAOYSA-N 6-methylheptan-1-ol Chemical compound CC(C)CCCCCO BWDBEAQIHAEVLV-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- RCEAADKTGXTDOA-UHFFFAOYSA-N OS(O)(=O)=O.CCCCCCCCCCCC[Na] Chemical compound OS(O)(=O)=O.CCCCCCCCCCCC[Na] RCEAADKTGXTDOA-UHFFFAOYSA-N 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- SMVRDGHCVNAOIN-UHFFFAOYSA-L disodium;1-dodecoxydodecane;sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O.CCCCCCCCCCCCOCCCCCCCCCCCC SMVRDGHCVNAOIN-UHFFFAOYSA-L 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Organic Chemistry (AREA)
- Fluid Mechanics (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Geochemistry & Mineralogy (AREA)
- Cosmetics (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
- Edible Oils And Fats (AREA)
Abstract
The invention provides a viscosity-reducing oil displacement agent for extra-thick crude oil, and a preparation method and application thereof, and belongs to the technical field of oilfield chemistry. The viscosity-reducing oil-displacing agent for crude oil provided by the invention comprises, by mass, 25-35% of an anionic surfactant, 20-30% of a zwitterionic surfactant, 5-10% of a water-soluble emulsifier, 15-20% of an auxiliary agent and the balance of water. The special oil viscosity-reducing oil displacement agent provided by the invention has an obvious viscosity-reducing effect on special thick oil with the viscosity of 10000mPa.s, can improve the viscosity-reducing rate to more than 97.9%, is effectively suitable for crude oil exploitation, and is beneficial to improving the recovery ratio.
Description
Technical Field
The invention belongs to the technical field of oilfield chemistry, and particularly relates to a viscosity-reducing oil displacement agent for extra-thick crude oil, and a preparation method and application thereof.
Background
Along with the continuous exploitation of crude oil, the easy-to-extract crude oil is gradually reduced, the exploitation of thick oil gradually becomes a trend, and the requirements on the performance of the oil displacement agent are more and more strict. The surfactant which utilizes the emulsification viscosity reduction characteristic of the surfactant and improves the oil-water fluidity ratio has become the most development potential technology for thick oil exploitation.
In order to improve the recovery efficiency of the thickened oil, steam flooding becomes a large-scale applied thickened oil thermal recovery technology at home and abroad, and domestic thickened oil has deep oil reservoir, high injection pressure, high stratum temperature, low dryness, thin reservoir thickness and low water activity, so the recovery efficiency of the thickened oil steam flooding is seriously influenced. Therefore, the viscosity of the crude oil is reduced by using the viscosity-reducing oil displacement agent, and the fluidity of the crude oil is improved, so that the recovery rate of the thick oil is improved, and the viscosity-reducing oil displacement agent becomes a new technology which is most developed for the recovery of the thick oil.
Patent application CN104531123A discloses a thick oil foam oil displacement agent, which consists of a zwitterionic surfactant, an anionic nonionic surfactant, a fluorocarbon surfactant and a cationic surfactant, and although the system can improve the extraction rate of thick oil, the system consists of the fluorocarbon surfactant, so that the cost is high and the economy is poor. Patent application CN110684519A discloses a low interfacial tension viscosity reduction foaming agent for common heavy oil reservoirs, which is composed of triple anionic nonionic surfactant, anionic nonionic surfactant and nonionic surfactant, and although the viscosity reduction rate of the system can reach more than 95%, the foaming agent only aims at common heavy oil and cannot be applied to viscosity reduction of heavy oil with higher viscosity and higher temperature. Therefore, no economical viscosity-reducing oil displacement agent for extremely thick crude oil which is suitable for the technology is available at present.
Disclosure of Invention
The viscosity reduction oil displacement agent can improve the viscosity reduction rate of the extra-thick crude oil to more than 95% at the stratum temperature of 70 ℃ and the crude oil viscosity of 10000mPa.s, and is effectively suitable for the exploitation of the crude oil; in addition, the preparation method is simple to operate, green, environment-friendly and pollution-free.
The invention provides a viscosity-reducing oil displacement agent for extra-thick crude oil, which comprises, by mass, 25-35% of an anionic surfactant, 20-30% of a zwitterionic surfactant, 5-10% of a water-soluble emulsifier, 15-20% of an auxiliary agent and the balance of water.
Preferably, the water-soluble emulsifier has the following structural formula (I):
wherein m is 1, 2 and 3, and n is 4, 7, 9, 10, 12, 15, 20 and 30.
Preferably, the water-soluble emulsifier is obtained by the following synthesis method:
after phenol is melted, adding sulfuric acid, heating to 135-145 ℃, starting to slowly dropwise add styrene, and reacting for 4-5h at the reaction temperature (140 +/-5) ° C;
cooling the reaction system, adding KOH for removing water, introducing ethylene oxide under the replacement of nitrogen, and reacting at the reaction temperature of 140 +/-10 ℃ and the pressure of 0.2-0.3Mpa for 1.5-2.5h to obtain the water-soluble emulsifier.
In the above scheme, the molar ratio of phenol to styrene charged was 1:3 and the molar ratio of phenol to ethylene oxide charged was 1: 2.
Preferably, the anionic surfactant is at least one selected from the group consisting of sodium fatty alcohol-polyoxyethylene ether sulfate, sodium isomeric dodecyl alcohol-polyoxyethylene ether sulfate, sodium isooctanol-polyoxyethylene ether sulfate, sodium fatty alcohol-polyoxypropylene ether sulfate, sodium lauryl ether sulfate and sodium dodecyl sulfate.
Preferably, the amphoteric surfactant is selected from at least one of cocamidopropyl ammonium oxide, dodecyl dimethyl ammonium oxide, tallow bis hydroxyethyl ammonium oxide and tetradecyl dimethyl ammonium oxide.
It can be understood that the anionic surfactant and the amphoteric surfactant used in the invention are green environment-friendly surfactants, which do not pollute the stratum, and the components have synergistic emulsification effect, so that the viscosity reduction rate can be effectively improved.
Preferably, the auxiliary agent is ethanol.
The invention provides a preparation method of a viscosity-reducing oil displacement agent for extra-thick crude oil according to any one of the technical schemes, which is characterized by comprising the following steps:
weighing the components according to the formula demand, sequentially adding the anionic surfactant, the amphoteric surfactant, the water-soluble emulsifier and the auxiliary agent into a reaction kettle, adding water at the temperature of 50-60 ℃, stirring for 1-2 hours, and uniformly mixing to obtain the oil displacement agent.
It will be appreciated that the order of addition of the reaction components in the above preparation process cannot be adjusted, mainly because the change in order affects the stability of the viscosity reducer and the viscosity reduction rate may not be as desired.
The invention provides an application of the viscosity-reducing oil displacement agent for extra-thick crude oil according to the technical scheme in the exploitation of extra-thick oil with the temperature of 70 ℃ and the viscosity of crude oil of 10000 mPa.s.
Preferably, when in use, the viscosity-reducing oil-displacing agent for extremely-thick crude oil is prepared into an aqueous solution with the use mass concentration of 0.3%.
Preferably, the viscosity reduction rate of the viscosity reduction oil displacement agent for extra-thick crude oil is more than or equal to 97.9 percent, and the interfacial tension is less than 4.2 multiplied by 10-2mN/m。
Compared with the prior art, the invention has the advantages that:
1. the oil displacement agent system provided by the invention is prepared by compounding an anionic surfactant, a zwitterionic surfactant and a water-soluble emulsifier. The used water-soluble emulsifier molecule can convert the surfactant into an oil-in-water emulsion from water-in-oil to oil-in-water emulsion in crude oil, has obvious viscosity reduction effect on ultra-heavy oil with the viscosity of more than 10000mPa.s, can improve the viscosity reduction rate to more than 97.9 percent, and reaches a new height compared with the standard of 95 percent, so the system is more suitable for the exploitation of the crude oil and is beneficial to improving the recovery ratio.
2. The oil displacement agent system provided by the invention is well matched with the demulsifier of the united station, does not influence the dehydration of crude oil after viscosity reduction, has good stability, and is suitable for the heavy oil exploitation of low-permeability oil reservoirs.
3. The preparation method of the oil-displacing agent system provided by the invention is simple to operate, green, environment-friendly and pollution-free, and is a novel ultra-thick oil viscosity-reducing oil-displacing agent product.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The parameters measured in the following examples and comparative examples are respectively measured according to the technical requirements of Q/SLCG 0257-2018 heavy oil viscosity reduction oil displacement agent, a SY/T0520 crude oil viscosity measurement rotational viscometer equilibrium method, and a SY/T5370-1999 surface and interfacial tension measurement method.
By combining the determination method, the reference value of the standard viscosity reduction rate is more than or equal to 95 percent, and the reference value of the interfacial tension is less than 5.0 multiplied by 10-2mN/m。
Example 1
The viscosity-reducing oil displacement agent for crude oil comprises the following system components in percentage by mass: 25% of anionic surfactant (fatty alcohol-polyoxyethylene ether sodium sulfate), 20% of amphoteric surfactant (cocamidopropyl ammonium oxide), 5% of water-soluble emulsifier (m is 1, n is 4), 15% of auxiliary agent ethanol and the balance of water (35%).
The preparation method comprises the following steps: and (3) sequentially adding the anionic surfactant, the amphoteric surfactant, the water-soluble emulsifier, the auxiliary agent and water into the reaction kettle at normal temperature and normal pressure, controlling the temperature at 60 ℃, and uniformly stirring to obtain the product.
The product obtained in example 1 was formulated to a concentration of 0.3% for performance testing under the following test conditions:
1. testing an instrument: DV-3T rheometer, constant temperature water bath, TX-500C type full-range rotary drop interfacial tensiometer;
2. experiment temperature: 70 ℃;
3. experimental oil: victory oil field a certain block of dehydrated crude oil (viscosity 10000 mPa.s);
the results of the experiments are shown in the following table:
| interfacial tension | 4.0×10-2mN/m |
| Viscosity reduction rate | 98.5％ |
Example 2
The viscosity-reducing oil displacement agent for crude oil comprises the following system components in percentage by mass: 30% of anionic surfactant (isomeric lauryl polyoxyethylene ether sodium sulfate), 25% of amphoteric surfactant (dodecyl dimethyl ammonium oxide), 6% of water-soluble emulsifier (m is 1, n is 4), 15% of auxiliary agent ethanol and the balance of water (24%).
The preparation method is the same as example 1.
The product obtained in example 2 was formulated to a concentration of 0.3% for performance testing under the following test conditions:
1. testing an instrument: DV-3T rheometer, constant temperature water bath, TX-500C type full-range rotary drop interfacial tensiometer;
2. experiment temperature: 70 ℃;
3. experimental oil: victory oil field a certain block of dehydrated crude oil (viscosity 10000 mPa.s);
the results of the experiments are shown in the following table:
| interfacial tension | 3.8×10-2mN/m |
| Viscosity reduction rate | 97.9％ |
Example 3
The viscosity-reducing oil displacement agent for crude oil comprises the following system components in percentage by mass: 35 percent of anionic surfactant (isooctanol polyoxyethylene ether sodium sulfate), 30 percent of amphoteric surfactant (tallow-based bis-hydroxyethyl ammonium oxide), 7 percent of water-soluble emulsifier (m is 2, n is 7), 17 percent of auxiliary agent ethanol and the balance of water (11 percent).
The preparation method is the same as example 1.
The product obtained in example 3 was formulated to a concentration of 0.3% for performance testing under the following test conditions:
1. testing an instrument: DV-3T rheometer, constant temperature water bath, TX-500C type full-range rotary drop interfacial tensiometer;
2. experiment temperature: 70 ℃;
3. experimental oil: victory oil field a certain block of dehydrated crude oil (viscosity 10000 mPa.s);
the results of the experiments are shown in the following table:
| interfacial tension | 4.2×10-2mN/m |
| Viscosity reduction rate | 98.2％ |
Example 4
The viscosity-reducing oil displacement agent for crude oil comprises the following system components in percentage by mass: 28% of anionic surfactant (fatty alcohol polyoxypropylene ether sodium sulfate), 24% of amphoteric surfactant (tetradecyl dimethyl ammonium oxide), 8% of water-soluble emulsifier (m is 2, n is 10), 20% of auxiliary agent ethanol and the balance of water.
The preparation method is the same as example 1.
The product obtained in example 4 was formulated to a concentration of 0.3% for performance testing under the following test conditions:
1. testing an instrument: DV-3T rheometer, constant temperature water bath, TX-500C type full-range rotary drop interfacial tensiometer;
2. experiment temperature: 70 ℃;
3. experimental oil: victory oil field a certain block of dehydrated crude oil (viscosity 10000 mPa.s);
the results of the experiments are shown in the following table:
| interfacial tension | 3.3×10-2mN/m |
| Viscosity reduction rate | 98.6％ |
Example 5
The viscosity-reducing oil displacement agent for crude oil comprises the following system components in percentage by mass: 32% of anionic surfactant (sodium lauryl ether sulfate), 26% of amphoteric surfactant (ammonium cocamidopropyl oxide), 9% of water-soluble emulsifier (m is 3, n is 12), 19% of auxiliary agent ethanol and 14% of water in balance.
The preparation method is the same as example 1.
The product obtained in example 5 was formulated to a concentration of 0.3% for performance testing under the following test conditions:
1. testing an instrument: DV-3T rheometer, constant temperature water bath, TX-500C type full-range rotary drop interfacial tensiometer;
2. experiment temperature: 70 ℃;
3. experimental oil: victory oil field a certain block of dehydrated crude oil (viscosity 10000 mPa.s);
the results of the experiments are shown in the following table:
| interfacial tension | 3.6×10-2mN/m |
| Viscosity reduction rate | 98.9％ |
Example 6
The viscosity-reducing oil displacement agent for crude oil comprises the following system components in percentage by mass: 34 percent of anionic surfactant (lauryl sodium sulfate), 28 percent of amphoteric surfactant (lauryl dimethyl ammonium oxide), 10 percent of water-soluble emulsifier (m is 3, n is 15), 20 percent of auxiliary agent ethanol and the balance of water.
The preparation method is the same as example 1.
The product obtained in example 6 was formulated to a concentration of 0.3% for performance testing under the following test conditions:
1. testing an instrument: DV-3T rheometer, constant temperature water bath, TX-500C type full-range rotary drop interfacial tensiometer;
2. experiment temperature: 70 ℃;
3. experimental oil: victory oil field a certain block of dehydrated crude oil (viscosity 10000 mPa.s);
the results of the experiments are shown in the following table:
| interfacial tension | 3.1×10-2mN/m |
| Viscosity reduction rate | 99.4％ |
Comparative example 1
The water-soluble emulsifier of example 5 was removed and the removed amount was made up with water, and the remaining ingredients and preparation were the same.
The product obtained in the comparative example 1 is prepared into a mass concentration of 0.3% for performance test, and the test conditions are as follows:
1. testing an instrument: DV-3T rheometer, constant temperature water bath, TX-500C type full-range rotary drop interfacial tensiometer;
2. experiment temperature: 70 ℃;
3. experimental oil: victory oil field a certain block of dehydrated crude oil (viscosity 10000 mPa.s);
the results of the experiments are shown in the following table:
| interfacial tension | 4.2×10-2mN/m |
| Viscosity reduction rate | 89.7％ |
Comparative example 2
The water-soluble emulsifier in example 5 was modified to the following structure (m is 3), and the remaining components and preparation method were the same.
The product obtained in the comparative example 2 is prepared into a mass concentration of 0.3% for performance test, and the test conditions are as follows:
1. testing an instrument: DV-3T rheometer, constant temperature water bath, TX-500C type full-range rotary drop interfacial tensiometer;
2. experiment temperature: 70 ℃;
3. experimental oil: victory oil field a certain block of dehydrated crude oil (viscosity 10000 mPa.s);
the results of the experiments are shown in the following table:
| interfacial tension | 4.4×10-2mN/m |
| Viscosity reduction rate | 92.5％ |
Comparative example 3
The anionic surfactant of example 1 was removed and the amount removed was made up to water, the remaining ingredients and the preparation method being the same.
The product obtained in the comparative example 3 is prepared into a mass concentration of 0.3% for performance test, and the test conditions are as follows:
1. testing an instrument: DV-3T rheometer, constant temperature water bath, TX-500C type full-range rotary drop interfacial tensiometer;
2. experiment temperature: 70 ℃;
3. experimental oil: victory oil field a certain block of dehydrated crude oil (viscosity 10000 mPa.s);
the results of the experiments are shown in the following table:
| interfacial tension | 0.14mN/m |
| Viscosity reduction rate | 95.8％ |
Comparative example 4
The amphoteric surfactant of example 2 was removed and the removed amount was made up with water, and the remaining ingredients and preparation were the same.
The product obtained in the comparative example 4 is prepared into a mass concentration of 0.3% for performance test, and the test conditions are as follows:
1. testing an instrument: DV-3T rheometer, constant temperature water bath, TX-500C type full-range rotary drop interfacial tensiometer;
2. experiment temperature: 70 ℃;
3. experimental oil: victory oil field a certain block of dehydrated crude oil (viscosity 10000 mPa.s);
the results of the experiments are shown in the following table:
| interfacial tension | 5.5×10-2mN/m |
| Viscosity reduction rate | 96.2％ |
Comparative example 5
In example 1, the content of the anionic surfactant was adjusted to 23%, the amount of the amphoteric surfactant was adjusted to 20%, the amount of the water-soluble emulsifier was adjusted to 5%, the amount of the adjuvant ethanol was adjusted to 15%, and the balance was water.
The product obtained in the comparative example 5 is prepared into a mass concentration of 0.3% for performance test, and the test conditions are as follows:
1. testing an instrument: DV-3T rheometer, constant temperature water bath, TX-500C type full-range rotary drop interfacial tensiometer;
2. experiment temperature: 70 ℃;
3. experimental oil: victory oil field a certain block of dehydrated crude oil (viscosity 10000 mPa.s);
the results of the experiments are shown in the following table:
| interfacial tension | 3.2×10-2mN/m |
| Viscosity reduction rate | 93.2％ |
Comparative example 6
In example 3, the content of the anionic surfactant was adjusted to 37%, the amount of the amphoteric surfactant was adjusted to 30%, the amount of the water-soluble emulsifier was adjusted to 7%, the amount of the adjuvant ethanol was adjusted to 17%, and the balance was water.
The product obtained in the comparative example 6 is prepared into a mass concentration of 0.3% for performance test, and the test conditions are as follows:
1. testing an instrument: DV-3T rheometer, constant temperature water bath, TX-500C type full-range rotary drop interfacial tensiometer;
2. experiment temperature: 70 ℃;
3. experimental oil: victory oil field a certain block of dehydrated crude oil (viscosity 10000 mPa.s);
the results of the experiments are shown in the following table:
| interfacial tension | 5.2×10-2 |
| Viscosity reduction rate | 96.2％ |
Comparative example 7
The amount of the anionic surfactant, the amphoteric surfactant, the water-soluble emulsifier, the adjuvant ethanol and the balance of water in example 1 were adjusted to 25%, 18%, 5% and 15%, respectively.
The product in comparative example 7 was formulated to a concentration of 0.3% for performance testing under the following test conditions:
1. testing an instrument: DV-3T rheometer, constant temperature water bath, TX-500C type full-range rotary drop interfacial tensiometer;
2. experiment temperature: 70 ℃;
3. experimental oil: victory oil field a certain block of dehydrated crude oil (viscosity 10000 mPa.s);
the results of the experiments are shown in the following table:
comparative example 8
The amount of the anionic surfactant, the amphoteric surfactant, the water-soluble emulsifier, the adjuvant ethanol and the balance of water in example 3 were adjusted to 35%, 32%, 7% and 17%, respectively.
The product in comparative example 8 was formulated to a concentration of 0.3% for performance testing under the following test conditions:
1. testing an instrument: DV-3T rheometer, constant temperature water bath, TX-500C type full-range rotary drop interfacial tensiometer;
2. experiment temperature: 70 ℃;
3. experimental oil: victory oil field a certain block of dehydrated crude oil (viscosity 10000 mPa.s);
the results of the experiments are shown in the following table:
| interfacial tension | 4.6×10-2 |
| Viscosity reduction rate | 92.7％ |
Comparative example 9
The amount of the anionic surfactant, the amphoteric surfactant, the water-soluble emulsifier, the adjuvant ethanol and the balance of water in example 1 were adjusted to 25%, 20%, 3% and 15%, respectively.
The product in comparative example 9 was formulated to a concentration of 0.3% for performance testing under the following test conditions:
1. testing an instrument: DV-3T rheometer, constant temperature water bath, TX-500C type full-range rotary drop interfacial tensiometer;
2. experiment temperature: 70 ℃;
3. experimental oil: victory oil field a certain block of dehydrated crude oil (viscosity 10000 mPa.s);
the results of the experiments are shown in the following table:
| interfacial tension | 4.2×10-2 |
| Viscosity reduction rate | 93.2％ |
Comparative example 10
The amount of the anionic surfactant, the amphoteric surfactant, the water-soluble emulsifier, the adjuvant ethanol and the balance of water in example 6 were adjusted to 34%, 28%, 12% and 20%, respectively.
The product of comparative example 10 was formulated to a concentration of 0.3% for performance testing under the following test conditions:
1. testing an instrument: DV-3T rheometer, constant temperature water bath, TX-500C type full-range rotary drop interfacial tensiometer;
2. experiment temperature: 70 ℃;
3. experimental oil: victory oil field a certain block of dehydrated crude oil (viscosity 10000 mPa.s);
the results of the experiments are shown in the following table:
| interfacial tension | 3.6×10-2 |
| Viscosity reduction rate | 92.4％ |
Through the comparison of the comparative examples 1 to 10, the single blank of each component, the ultra-high/low usage amount of each component and the replacement angle of the water-soluble emulsifier are respectively set, and the comparison of the data of the comparative examples and the comparative examples shows that the interfacial tension and the viscosity reduction rate of the oil-displacing agent obtained by the comparative examples either cannot satisfy the requirements doubly, or both index parameters are obviously lower than the standards or cannot achieve the effects achieved by the examples.
Claims (9)
1. The viscosity-reducing oil displacement agent for the extra-thick crude oil is characterized by comprising, by mass, 25-35% of an anionic surfactant, 20-30% of a zwitterionic surfactant, 5-10% of a water-soluble emulsifier, 15-20% of an auxiliary agent and the balance of water.
2. The viscosity-reducing oil displacement agent for extra-thick crude oil according to claim 1, wherein the water-soluble emulsifier has the following structural formula (I):
wherein m is 1, 2 and 3, and n is 4, 7, 9, 10, 12, 15, 20 and 30.
3. The viscosity-reducing oil displacement agent for extra-thick crude oil according to claim 1, wherein the anionic surfactant is at least one selected from the group consisting of sodium fatty alcohol-polyoxyethylene ether sulfate, sodium isomeric dodecyl alcohol-polyoxyethylene ether sulfate, sodium isooctyl alcohol-polyoxyethylene ether sulfate, sodium fatty alcohol-polyoxypropylene ether sulfate, sodium lauryl ether sulfate and sodium dodecyl sulfate.
4. The viscosity reducing and oil displacing agent for extra thick crude oil according to claim 1, wherein the amphoteric surfactant is at least one selected from the group consisting of cocamidopropyl ammonium oxide, dodecyl dimethyl ammonium oxide, tallow bis hydroxyethyl ammonium oxide, and tetradecyl dimethyl ammonium oxide.
5. The viscosity-reducing oil-displacing agent for extra-thick crude oil according to claim 1, wherein the auxiliary agent is selected from ethanol.
6. The preparation method of the viscosity-reducing oil-displacing agent for extremely thick crude oil according to any one of claims 1 to 5, which is characterized by comprising the following steps:
weighing the components according to the formula demand, sequentially adding the anionic surfactant, the amphoteric surfactant, the water-soluble emulsifier and the auxiliary agent into a reaction kettle, adding water at the temperature of 50-60 ℃, stirring for 1-2 hours, and uniformly mixing to obtain the oil displacement agent.
7. The use of the viscosity-reducing and oil-displacing agent for extra-thick crude oil according to any one of claims 1 to 5 in the recovery of extra-thick oil with the temperature of 70 ℃ and the viscosity of crude oil of 10000 mPa.s.
8. The application of claim 7, wherein in use, the viscosity-reducing oil displacement agent for extra-thick crude oil is prepared into an aqueous solution with a use mass concentration of 0.3%.
9. The application of claim 8, wherein the viscosity reduction rate of the viscosity reduction oil displacement agent for extra-thick crude oil is more than or equal to 97.9%, and the interfacial tension is less than 4.2 x 10-2mN/m。
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