CN104818008A - Vesicle oil-displacing agent formed by anionic surfactant compounded system and application thereof - Google Patents
Vesicle oil-displacing agent formed by anionic surfactant compounded system and application thereof Download PDFInfo
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- CN104818008A CN104818008A CN201510172206.7A CN201510172206A CN104818008A CN 104818008 A CN104818008 A CN 104818008A CN 201510172206 A CN201510172206 A CN 201510172206A CN 104818008 A CN104818008 A CN 104818008A
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- oil
- vesica
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- tensio
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 65
- 239000003945 anionic surfactant Substances 0.000 title claims abstract description 28
- 239000004094 surface-active agent Substances 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 24
- 238000011084 recovery Methods 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 239000013543 active substance Substances 0.000 claims description 44
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 36
- 150000001875 compounds Chemical class 0.000 claims description 25
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 10
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 10
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 10
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 10
- 239000005642 Oleic acid Substances 0.000 claims description 10
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 10
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 10
- 230000033558 biomineral tissue development Effects 0.000 claims description 9
- 230000002209 hydrophobic effect Effects 0.000 claims description 8
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 7
- 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 7
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 7
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 7
- 229910001424 calcium ion Inorganic materials 0.000 claims description 7
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 7
- 239000011734 sodium Substances 0.000 claims description 7
- 229910052708 sodium Inorganic materials 0.000 claims description 7
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 6
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 6
- 229930195729 fatty acid Natural products 0.000 claims description 6
- 239000000194 fatty acid Substances 0.000 claims description 6
- 230000000977 initiatory effect Effects 0.000 claims description 5
- 239000003208 petroleum Substances 0.000 claims description 5
- 239000004711 α-olefin Substances 0.000 claims description 5
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 4
- 150000004665 fatty acids Chemical class 0.000 claims description 4
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 4
- 229910021653 sulphate ion Inorganic materials 0.000 claims description 4
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 claims description 3
- 239000004141 Sodium laurylsulphate Substances 0.000 claims description 3
- FYRWSOKGHDXPAK-UHFFFAOYSA-N [Na].C(CCCCCCCCCCC)C(=O)O Chemical compound [Na].C(CCCCCCCCCCC)C(=O)O FYRWSOKGHDXPAK-UHFFFAOYSA-N 0.000 claims description 3
- 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
- 235000019333 sodium laurylsulphate Nutrition 0.000 claims description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 2
- 125000005599 alkyl carboxylate group Chemical group 0.000 claims description 2
- 125000000217 alkyl group Chemical group 0.000 claims description 2
- 150000008052 alkyl sulfonates Chemical class 0.000 claims description 2
- -1 alkylbenzene sulfonate Chemical class 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 2
- 150000001735 carboxylic acids Chemical class 0.000 claims description 2
- 125000004494 ethyl ester group Chemical group 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 235000006408 oxalic acid Nutrition 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 2
- DAJSVUQLFFJUSX-UHFFFAOYSA-M sodium;dodecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCS([O-])(=O)=O DAJSVUQLFFJUSX-UHFFFAOYSA-M 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 36
- 239000010779 crude oil Substances 0.000 abstract description 13
- 238000001179 sorption measurement Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000011065 in-situ storage Methods 0.000 abstract description 3
- 239000003513 alkali Substances 0.000 abstract description 2
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 150000003839 salts Chemical class 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 125000003010 ionic group Chemical group 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 239000004530 micro-emulsion Substances 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 239000009671 shengli Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000008398 formation water Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003592 biomimetic effect Effects 0.000 description 1
- 150000001767 cationic compounds Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 239000003937 drug carrier Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910001411 inorganic cation Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention relates to a vesicle oil-displacing agent formed by an anionic surfactant compounded system. The vesicle oil-displacing agent is prepared by mixing a surfactant B, a surfactant C and mineralized water and stirring a mixture under the trigger of an auxiliary agent. Mass concentration of the surfactant B and the surfactant C is 0.3-0.8 wt%. The ratio of the addition amount of the auxiliary agent to the total mass of the surfactants B and C is 1:3-5. Total salinity of the mineralized water is 500-5000 ppm. The vesicle oil-displacing agent of the anionic surfactant compounded system has strong oil-water interface adsorption tendency. By in-situ assembling, a predetermined interface layer is formed. Thus, interfacial tension can be rapidly reduced to an ultralow level by oil-water. Without any alkali, 10<-3>mN.m<-1> of ultralow interfacial tension can be formed with crude oil. The effect of reducing the oil-water interfacial tension is prominent, and the action time is short. The interfacial tension can be reduced to 10<-3>mN.m<-1> within 10-15 min. The vesicle oil-displacing agent is suitable for tertiary oil recovery for enhancing crude oil recovery.
Description
Technical field
The present invention relates to the vesica oil-displacing agent that a kind of anion surfactant compound system is formed, oil water interfacial tension can be down to ultralow (10 fast
-3mNm
-1), be applied in tertiary oil recovery and improve oil recovery factor, belong to technical field of oilfield chemistry.
Background technology
Oil is as the very important nonrenewable resource of one, along with economy rapid growth, society sharply rises to petroleum demand, and find that the possibility of larger reserves oil reservoir reduces again, the recovery ratio improving developed field is got most of the attention, takes the recovery ratio of technique means raising developed field extremely urgent.
In oil production process, in oil reservoir, the flowing of fluid is by the impact of the geologic agent such as Reservoir Sandstones pore texture, system wettability, is also subject to the impact of the factors such as crude oil/water interface simultaneously.Because tensio-active agent has interfacial activity, can significantly reduce oil/water interfacial tension, increase capillary number, and impel crude oil desorption and effectively disperseing on rock, realizing the effective driving to irreducible oil, thus improve recovery ratio, is therefore the most frequently used oil-displacing agent.Oil water interfacial tension is made to be down to ultralow 10
-3mNm
-1, be the important indicator of screening tensio-active agent as chemical oil displacement agent.
As everyone knows, at different conditions, tensio-active agent can form multiple associative structure in aqueous, as micella, microemulsion, liquid crystal and vesica etc.According to existing bibliographical information, micella and the microemulsion of the tensio-active agent formation of specific composition all can make oil water interfacial tension be down to ultralow 10
-3mNm
-1, it is used as Study on Correlative Mechanisms and all existing a large amount of report of system probe of enhanced oil recovery by using displacing agent, and achieves good result in applying at the scene.Also the liquid crystal system having bibliographical information tensio-active agent to be formed can make oil water interfacial tension be down to ultralow 10
-3mNm
-1, but during owing to forming liquid crystal, tensio-active agent working concentration is high, and its application in tertiary oil recovery is restricted.Have been reported the theoretical investigation of vesica at Disciplinary Frontiers such as Biomimetic membrane, pharmaceutical carrier, preparation nano materials at present, but its application potential in industrial application is not yet revealed, the application in tertiary oil recovery is more without report.
At present, the potentiality to be exploited of high salinity reservoir is larger, but due to the challenge that the salt resistance of high salinity Surfactant is brought, most surfactant system cannot be formed and oil water interfacial tension can be made to be down to ultralow micella or microemulsion under high salt condition, can be applicable to flooding system and correlation technique famine that high salinity reservoir improves recovery ratio.
Summary of the invention
For the deficiencies in the prior art, the invention provides the vesica oil-displacing agent that a kind of anion surfactant compound system is formed, oil water interfacial tension can be down to ultralow by this vesica oil-displacing agent, is applicable to being applied to enhancing crude oil recovery efficiency in tertiary recovery.Anion surfactant compound system vesica oil-displacing agent of the present invention, has good adaptability to mineralized water, under high salt condition, also can form vesica, interfacial tension can be made to reduce further, is particularly suitable for high salinity reservoir and improves oil recovery factor.
Technical scheme of the present invention is as follows:
The vesica oil-displacing agent that anion surfactant compound system is formed, is characterized in that, after being mixed with mineralized water by surfactant B, tensio-active agent C, in temperature 20-30 DEG C, stirring 0.2 ~ 0.5h obtains vesica oil-displacing agent under initiation at auxiliary agent,
In obtained vesica oil-displacing agent, the total mass concentration of surfactant B and tensio-active agent C is 0.3% ~ 0.8wt%, surfactant B: the mass ratio of tensio-active agent C is (1 ~ 5): (5 ~ 1), the add-on of auxiliary agent and surfactant B and tensio-active agent C total mass ratio are: 1:3 ~ 5, the total mineralization of mineralized water is 500 ~ 5000ppm
Be the hydrophobic grouping of C8-C24 containing at least one electronegative polar hydrophilic group and a total carbon chain lengths in described surfactant B molecule, described hydrophobic grouping contains two side chains;
Be the hydrophobic grouping of C8-C24 containing at least one electronegative polar hydrophilic group and a carbon chain lengths in described tensio-active agent C molecule, described hydrophobic grouping is strand;
Described auxiliary agent is the carboxylic acid containing 1-3 carboxyl in carbon chain lengths C6-C18, molecule.
The present invention is preferred, and surfactant B is selected from collateralization alkyl-sulphate, collateralization alkyl polyoxyethylene ether, collateralization alkylsulfonate or collateralization alkyl carboxylate.
Preferred further, surfactant B is branched dodecyl sodium sulfate, branched dodecyl Soxylat A 25-7, branched dodecyl sodium sulfonate or branched dodecyl carboxylic acid sodium.
The present invention is preferred, and tensio-active agent C is selected from alkylbenzene sulfonate, alkyl-sulphate, sulfonated α-olefin, sulfonated petro-leum or fatty-acid ethyl ester sulfonate.
Preferred further, tensio-active agent C is Sodium dodecylbenzene sulfonate, sodium lauryl sulphate, alpha-olefin sodium sulfonate, petroleum sodium sulfonate or fatty-acid ethyl ester sodium sulfonate.
The present invention is preferred, and auxiliary agent is selected from one or more the mixture in citric acid, higher fatty acid or oxalic acid.
Preferred further, auxiliary agent is citric acid and oleic acid, and the mass ratio of citric acid and oleic acid is: 1:2.
The present invention is preferred, surfactant B: the mass ratio of tensio-active agent C is (3 ~ 5): (1 ~ 3), and the add-on of auxiliary agent and surfactant B and tensio-active agent C total mass ratio are: 1:4 ~ 5.
The present invention is preferred, and in obtained vesica oil-displacing agent, the total mass concentration of surfactant B and tensio-active agent C is 0.5% ~ 0.6wt%, and the total mineralization of mineralized water is 1000 ~ 4000ppm.
The application of the vesica oil-displacing agent that above-mentioned anion surfactant compound system is formed, recovery ratio is improved after being applied to low-permeability oil deposit, carbonate oil reservoir, conventional sandstone oil reservoir late high water content period or polymer injection, the salinity range of vesica oil-displacing agent tolerance is: total mineralization 1-30,000ppm, calcium ions and magnesium ions total concn 1-1,000ppm.
The technical characterstic of the vesica oil-displacing agent that anion surfactant compound system of the present invention is formed and beneficial effect:
Surfactant B of the present invention, tensio-active agent C form vesica under calcium ions and magnesium ions and auxiliary agent induction.This vesica has stronger water-oil interface adsorption tendency, and assemble in situ forms predetermined interfacial layer, oil water interfacial tension is down to ultralow, lower than 10
-3mNm
-1, at induced adsorption behind interface, the interfacial layer that new assembling produces, primarily of applying surface promoting agent and auxiliary molecules composition, affects less by crude oil composition, has oil phase universality, therefore have good oil reservoir conformability.Surfactant B, tensio-active agent C carry out the spontaneous formation vesica of interface self-assembly under calcium ions and magnesium ions induction, avoid surfactant molecule and inorganic cation to generate and precipitate, improve the salt resistance of tensio-active agent, therefore the adaptability of this vesica oil-displacing agent formation mineralized water is good.In addition because selected surfactant interface adsorption tendency is strong, oil/water interfacial tension is down to ultralow fast, and working concentration is low.
(1) the vesica oil-displacing agent that anion surfactant compound system of the present invention is formed has stronger water-oil interface adsorption tendency, assemble in situ forms predetermined interfacial layer, interfacial tension can be down to by profit fast ultralow, 10 can be formed with crude oil without the need to any alkali
-3mNm
-1ultra low interfacial tension, reduce the remarkably productive of oil/water interfacial tension, action time is short, can by interfacial tension lowering to 10 in 10-15 minute
-3mNm
-1.
(2) working concentration is low, to the oil phase strong adaptability of difference composition, is conducive to guarantee three and adopts the effect improving recovery ratio.
(3) anion surfactant compound system vesica oil-displacing agent of the present invention still can reduce interfacial tension preferably under higher salinity, and salt resistance is good, Heat stability is good, in the recovery ratio improving high salinity reservoir, have great application prospect.
(4) anion surfactant compound system of the present invention also can form binary combination flooding oil systems with polymkeric substance, both reduces oil water interfacial tension, improves oil-displacing agent viscosity again, thus increases substantially recovery ratio.
(5) present invention process is simple, and reaction is easy to control, applied range.
Accompanying drawing explanation
Fig. 1 is the transmission electron microscope photo of the vesica oil-displacing agent that embodiment 1 obtains;
Fig. 2 is the transmission electron microscope photo of the vesica oil-displacing agent that embodiment 2 obtains;
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention will be further described, but be not limited only to this.
Embodiment 1:
The vesica oil-displacing agent that a kind of anion surfactant compound system is formed, after the mineralized water being 500ppm by surfactant B, tensio-active agent C and total mineralization mixes, under temperature 25 DEG C, initiation at auxiliary agent, stir 0.3h obtain vesica oil-displacing agent, mineralized water ionic group becomes calcium ion and magnesium ion.
In obtained vesica oil-displacing agent, the total mass concentration of surfactant B and tensio-active agent C is 0.5wt%, surfactant B: the mass ratio of tensio-active agent C is 1:3, and the add-on of auxiliary agent and surfactant B and tensio-active agent C total mass ratio are: 1:3,
Described surfactant B is branched dodecyl sodium sulfate,
Described tensio-active agent C is Sodium dodecylbenzene sulfonate,
Described auxiliary agent is citric acid and oleic acid, and the mass ratio of citric acid and oleic acid is: 1:2.Obtained anion surfactant compound system vesica oil-displacing agent electron-microscope scanning figure as shown in Figure 1.
Product is carried out interfacial tension test:
1, testing tool: TEXAS-500 rotates and drips interfacial tensimeter
2, temperature: 50 DEG C,
3, crude oil: experimental standard crude oil (Shengli Oil Field provides)
4, water: distilled water
5, vesica oil-displacing agent: embodiment 1, main component (w%)
The sample hose filling previous solu is put into, after stablizing half an hour, add about 1 microlitre Shengli Oil Field with microsyringe and win mouthful crude oil that sticks together, according to GB SY/T5370-1999 method, between read interfacial tension at regular intervals, within 10 minutes, reach 0.00458mN/m with interface stress.
The vesica oil-displacing agent of different working concentration is on the impact of interfacial tension, and result is as shown in table 1:
Table 1
| Vesica oil-displacing agent concentration (w%) | Interfacial tension (mNm -1) |
| 0.3 | 0.156 |
| 0.4 | 0.115 |
| 0.5 | 0.00458 |
| 0.55 | 0.0045 |
| 0.6 | 0.00442 |
| 0.65 | 0.00418 |
| 0.7 | 0.00397 |
Embodiment 2:
The vesica oil-displacing agent that a kind of anion surfactant compound system is formed, after the mineralized water being 1000ppm by surfactant B, tensio-active agent C and total mineralization mixes, under temperature 30 DEG C, initiation at auxiliary agent, stir 0.5h obtain vesica oil-displacing agent, mineralized water ionic group becomes calcium ion and magnesium ion.
In obtained vesica oil-displacing agent, the total mass concentration of surfactant B and tensio-active agent C is 0.6wt%, surfactant B: the mass ratio of tensio-active agent C is 4:1, and the add-on of auxiliary agent and surfactant B and tensio-active agent C total mass ratio are: 1:5,
Described surfactant B is branched dodecyl Soxylat A 25-7,
Described tensio-active agent C is sodium lauryl sulphate,
Described auxiliary agent is citric acid and oleic acid, and the mass ratio of citric acid and oleic acid is: 1:2.Obtained anion surfactant compound system vesica oil-displacing agent electron-microscope scanning figure as shown in Figure 2.
Product is carried out interfacial tension test, and the testing tool of use, crude oil, water, temperature are with embodiment 1;
Vesica oil-displacing agent: embodiment 2, main component (w%)
The sample hose filling previous solu is put into, after stablizing half an hour, add about 1 microlitre Shengli Oil Field with microsyringe and win mouthful crude oil that sticks together, according to GB SY/T5370-1999 method, between read interfacial tension at regular intervals, within 15 minutes, reach 0.00843mN/m with interface stress.
The vesica oil-displacing agent of different working concentration is on the impact of interfacial tension, and result is as shown in table 2:
Table 2
| Vesica oil-displacing agent concentration (w%) | Interfacial tension (mNm -1) |
| 0.4 | 0.135 |
| 0.5 | 0.103 |
| 0.6 | 0.00843 |
| 0.65 | 0.00816 |
| 0.7 | 0.0080 |
| 0.75 | 0.00795 |
| 0.8 | 0.00784 |
Embodiment 3:
The vesica oil-displacing agent that a kind of anion surfactant compound system is formed, after the mineralized water being 2500ppm by surfactant B, tensio-active agent C and total mineralization mixes, under temperature 30 DEG C, initiation at auxiliary agent, stir 0.4h obtain vesica oil-displacing agent, mineralized water ionic group becomes calcium ion and magnesium ion.
In obtained vesica oil-displacing agent, the total mass concentration of surfactant B and tensio-active agent C is 0.4wt%, surfactant B: the mass ratio of tensio-active agent C is 1:1, and the add-on of auxiliary agent and surfactant B and tensio-active agent C total mass ratio are: 1:4,
Described surfactant B is branched dodecyl carboxylic acid sodium,
Described tensio-active agent C is alpha-olefin sodium sulfonate,
Described auxiliary agent is citric acid and oleic acid, and the mass ratio of citric acid and oleic acid is: 1:2.
Product is carried out interfacial tension test, and the testing tool of use, crude oil, water, temperature are with embodiment 1;
Vesica oil-displacing agent: embodiment 3, main component (w%)
The vesica oil-displacing agent of different working concentration is on the impact of interfacial tension, and result is as shown in table 3:
Table 3
| Vesica oil-displacing agent concentration (w%) | Interfacial tension (mNm -1) |
| 0.15 | 0.0187 |
| 0.2 | 0.0168 |
| 0.3 | 0.0102 |
| 0.4 | 0.00624 |
| 0.45 | 0.00603 |
| 0.5 | 0.00588 |
| 0.6 | 0.00574 |
Comparative example 1: commercially available branched dodecyl sodium sulfate
Comparative example 2: commercially available Sodium dodecylbenzene sulfonate
Salt resistance is tested:
The vesica oil-displacing agent of embodiment 1-3 and comparative example 1,2 are by simulated formation aquametry surface tension under similarity condition, and test result is as shown in table 5:
The composition of table 4 simulated formation water
The vesica oil-displacing agent of table 5 embodiment 1-3 and the interfacial tension of comparative example 1,2 pairs of simulated formation water
| Product | Interfacial tension (mNm -1) |
| Embodiment 1 | 0.00458 |
| Embodiment 2 | 0.00843 |
| Embodiment 3 | 0.00624 |
| Comparative example 1 | 0.0125 |
| Comparative example 2 | 0.0157 |
Result: from table 5, under salinity is greater than 30000mg/L condition, the vesica oil-displacing agent of embodiments of the invention 1-3 has ultralow surface tension, and comparative example 1,2 is under high salt condition, do not possess surfactivity, the present invention has good salt resistance, can meet the service requirements of high salinity reservoir.
Claims (10)
1. an anion surfactant compound system vesica oil-displacing agent, is characterized in that, after being mixed with mineralized water by surfactant B, tensio-active agent C, in temperature 20-30 DEG C, stir 0.2 ~ 0.5h under initiation at auxiliary agent and obtain vesica oil-displacing agent,
In obtained vesica oil-displacing agent, the total mass concentration of surfactant B and tensio-active agent C is 0.3% ~ 0.8wt%, surfactant B: the mass ratio of tensio-active agent C is (1 ~ 5): (5 ~ 1), the add-on of auxiliary agent and surfactant B and tensio-active agent C total mass ratio are: 1:3 ~ 5, the total mineralization of mineralized water is 500 ~ 5000ppm
Be the hydrophobic grouping of C8-C24 containing at least one electronegative polar hydrophilic group and a total carbon chain lengths in described surfactant B molecule, described hydrophobic grouping contains two side chains;
Be the hydrophobic grouping of C8-C24 containing at least one electronegative polar hydrophilic group and a carbon chain lengths in described tensio-active agent C molecule, described hydrophobic grouping is strand;
Described auxiliary agent is the carboxylic acid containing 1-3 carboxyl in carbon chain lengths C6-C18, molecule.
2. anion surfactant compound system vesica oil-displacing agent according to claim 1, it is characterized in that, surfactant B is selected from collateralization alkyl-sulphate, collateralization alkyl polyoxyethylene ether, collateralization alkylsulfonate or collateralization alkyl carboxylate.
3. anion surfactant compound system vesica oil-displacing agent according to claim 2, it is characterized in that, surfactant B is branched dodecyl sodium sulfate, branched dodecyl Soxylat A 25-7, branched dodecyl sodium sulfonate or branched dodecyl carboxylic acid sodium.
4. anion surfactant compound system vesica oil-displacing agent according to claim 1, it is characterized in that, tensio-active agent C is selected from alkylbenzene sulfonate, alkyl-sulphate, sulfonated α-olefin, sulfonated petro-leum or fatty-acid ethyl ester sulfonate.
5. anion surfactant compound system vesica oil-displacing agent according to claim 4, is characterized in that, tensio-active agent C is Sodium dodecylbenzene sulfonate, sodium lauryl sulphate, alpha-olefin sodium sulfonate, petroleum sodium sulfonate or fatty-acid ethyl ester sodium sulfonate.
6. anion surfactant compound system vesica oil-displacing agent according to claim 1, it is characterized in that, auxiliary agent is selected from one or more the mixture in citric acid, higher fatty acid or oxalic acid.
7. anion surfactant compound system vesica oil-displacing agent according to claim 6, it is characterized in that, auxiliary agent is citric acid and oleic acid, and the mass ratio of citric acid and oleic acid is: 1:2.
8. anion surfactant compound system vesica oil-displacing agent according to claim 1, it is characterized in that, surfactant B: the mass ratio of tensio-active agent C is (3 ~ 5): (1 ~ 3), the add-on of auxiliary agent and surfactant B and tensio-active agent C total mass ratio are: 1:4 ~ 5.
9. anion surfactant compound system vesica oil-displacing agent according to claim 1, it is characterized in that, in obtained vesica oil-displacing agent, the total mass concentration of surfactant B and tensio-active agent C is 0.5% ~ 0.6wt%, and the total mineralization of mineralized water is 1000 ~ 4000ppm.
10. the application of the compound system vesica oil-displacing agent of anion surfactant according to claim 1, recovery ratio is improved after being applied to low-permeability oil deposit, carbonate oil reservoir, conventional sandstone oil reservoir late high water content period or polymer injection, the salinity range of vesica oil-displacing agent tolerance is: total mineralization 1-30,000ppm, calcium ions and magnesium ions total concn 1-1,000ppm.
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