CN105331348A - Homogeneous-phase microemulsion oil-displacing agent applied to low-permeation oil field and preparation method of homogeneous-phase microemulsion oil-displacing agent - Google Patents
Homogeneous-phase microemulsion oil-displacing agent applied to low-permeation oil field and preparation method of homogeneous-phase microemulsion oil-displacing agent Download PDFInfo
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- CN105331348A CN105331348A CN201510882903.1A CN201510882903A CN105331348A CN 105331348 A CN105331348 A CN 105331348A CN 201510882903 A CN201510882903 A CN 201510882903A CN 105331348 A CN105331348 A CN 105331348A
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- 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
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09K2208/10—Nanoparticle-containing well treatment fluids
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Abstract
The invention discloses a homogeneous-phase microemulsion oil-displacing agent applied to low-permeation oil field for improving the crude oil recovery rate and a preparation method of the homogeneous-phase microemulsion oil-displacing agent. In the formula of the homogeneous-phase microemulsion oil-displacing agent, the volume ratio of oil to water is 1 to 1; according to the mass concentration, the homogeneous-phase microemulsion oil-displacing agent is prepared from 2-3.5% of compound surface activated agent, 4.5-11% of auxiliary surface activated agent and 2.5-8.5% of electrolyte. The preparation method includes the steps of evenly mixing compound surface activated agent, electrolyte aqueous solution and oil phase, dropwise adding the auxiliary surface activated agent to emulsion, and preparing homogeneous-phase microemulsion under the standing condition. The homogeneous-phase microemulsion system has the advantages of being high in thermodynamics stability, strong in water and oil solubilization capacity, extremely low in oil-water interface tension and the like; the problems that a low-permeation oil field is difficult in chemical flooding injection, poor in adaptability and low in recover rate increasing capacity are mainly solved.
Description
Technical field
The invention belongs to low permeability oil field chemical flooding and improve recovery efficiency technique field, particularly a kind of homogeneous phase microemulsion flooding agent being applied to low permeability oil field and preparation method thereof.
Background technology
Chemical flooding is the important raising recovery efficiency technique of China's later stage of water flooding oilfield development, and the major oil districts such as domestic Daqing oil field, Shengli Oil Field and Xinjiang Oilfield have all carried out polymkeric substance field test and achieved certain effect.In conjunction with desk research and rig-site utilization situation, its in raising recovery ratio process main have five in problem: 1. cause polymkeric substance that hydrolysis occurs because formation temperature is high and molecular degradation reacts, formation water salinity is high and under hole shearing action, polymer solution system virtual viscosity is caused to reduce, even produce precipitation, oil-displacement capacity reduces; 2. strong and there is the stratum of macrovoid throat in nonuniformity, polymers soln is easily along most permeable zone channelling, and cause involving uneven, oil displacement efficiency is deteriorated; 3. formation after polymer flooding remains number of polymers, and the polymers soln returned out from oil well easily causes ground environment to pollute; 4. there is fingering phenomenon when postpolymer flood recovers water drive, the water ratio of oil well liquid-producing rises fast; 5. there is impenetrability pore volume (about 5% ~ 30%) in the earth formation in polymkeric substance, reduces the swept volume of polymer flooding.Compared to other chemical floodings, caustic waterflooding has that feeding is convenient, low price and simple operation and other advantages, but its alkaline consumption, generates the reasons such as the limited and infringement stratum of surfactant and cause the degree that cannot reach industrial applications.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of homogeneous phase microemulsion flooding agent being applied to low permeability oil field and preparation method thereof, adopt the homogeneous phase microemulsion be mixed to form of anion-nonionic type tensio-active agent, alcohol, alkane and salt solution, this is applied to the homogeneous phase microemulsion flooding agent of low permeability oil field, can effectively be injected in low-permeability oil deposit, the ability of its strong solubilisation oils and water and and crude oil between ultra low interfacial tension significantly can increase oil recovery factor.
To achieve these goals, the technical solution used in the present invention is:
A kind of homogeneous phase microemulsion flooding agent being applied to low permeability oil field, oil and water volume ratio are 1:1, the mass percent that each concentration of component accounts for profit total amount by this constituent mass represents, wherein: compound surfactant concentration 2% ~ 3.5%, cosurfactant concentration 4.5% ~ 11%, electrolyte concentration 2.5% ~ 8.5%.
Described oil is C
7-C
9normal paraffin, such as normal heptane, octane or n-nonane, be preferably octane, the equivalent alkane carbon number equal principle of based on crude is selected.
Described compound surfactant is aniorfic surfactant and nonionic surface active agent compound system.The XSY-1 type tensio-active agent that such as Xi'an Bo Zhong development in science and technology limited liability company produces.
Described aniorfic surfactant is sodium lauryl sulphate, described nonionic surface active agent is alkylol amide Soxylat A 25-7, aniorfic surfactant and nonionic surface active agent mass ratio are 4:1, and adding sodium-chlor formation compound system, sodium-chlor quality is 0.2% of two kinds of tensio-active agent total masses.
Described cosurfactant is low-carbon (LC) alcohols, as propyl alcohol, propyl carbinol, isopropylcarbinol or amylalcohol, is preferably propyl carbinol.
Described ionogen is for having positive monovalent sodium salt (as NaCl or NaNO
3), positive divalence calcium salt is (as CaCl
2) or the mixture of these two kinds of salt different ratioss.Be preferably NaCl.
Present invention also offers a kind of described in be applied to the preparation method of the homogeneous phase microemulsion flooding agent of low permeability oil field, first, oil and water is got by described volume ratio, secondly, take compound surfactant respectively in proportion and the two is mixed into milk sap by ionogen, then in milk sap, add cosurfactant in proportion, be stirred to evenly with 250 revs/min of rotating speeds, leave standstill and obtain homogeneous phase microemulsion.
Compared with prior art, the present invention has the following advantages or beneficial effect:
1, injectability is strong, and its particle diameter of microemulsion of the present invention is mainly distributed between 40 ~ 50nm, and microemulsion can enter into hypotonic and ultralow permeable reservoir hole, thus fully contacts with blowhole surface, reaches the object reducing interfacial tension.
2, thermodynamic stability is good, and this homogeneous phase Emulsions leaves standstill three months under tying up to 90 DEG C of conditions, and system homogeneous transparent, each phase volume does not change.
3, good flowing properties, condensation point is less than-10 DEG C, is applicable to some areas site operation in winter.
4 and oil, ultra low interfacial tension between water, the interfacial tension of microemulsion/oil and the interfacial tension 10-3mN/m of microemulsion/water.
5, reduce injection pressure successful, in core experiment, inject homogeneous phase microemulsion slug after a water drive, then carry out sequent water flooding, sequent water flooding stablize after injection pressure significantly reduce than a water drive CIP.
6, improve oil recovery factor ability strong, in core experiment, inject homogeneous phase microemulsion system continuously, oil displacement efficiency, close to 100%, injects the microemulsion slug of different aperture volume multiple, and it improves oil recovery factor successful.
Embodiment
Embodiments of the present invention are described in detail below in conjunction with embodiment.
Oil and water volume ratio 1:1, the mass percentage concentration that each concentration of component accounts for profit total amount by this constituent mass represents, Xi'an Bo Zhong development in science and technology limited liability company product XSY-1 surfactant concentration 2.5%, propyl carbinol concentration 8%, NaCl concentration 5.5%.Stir 15 minutes to evenly with 250 revs/min of rotating speeds after mixing, after leaving standstill, obtain homogeneous phase microemulsion.
Investigate interfacial tension, the step-down rate between the homogeneous phase microemulsion particle diameter of preparation, thermodynamic stability and oil, water respectively in accordance with the following methods and improve oil recovery factor ability.
1, grain diameter measurement: carry out scanning electron microscope to homogeneous phase microemulsion system, observes its particle diameter.
2, thermodynamic stability is measured: the water bath with thermostatic control homogeneous phase microemulsion system of preparation being placed in respectively 20 DEG C, 50 DEG C and 90 DEG C, observes layering and precipitating and the homogeneous transparent situation of different time system.
3, the interfacial tension between homogeneous phase microemulsion and oil, water is measured: adopt to rotate and drip interfacial tensimeter and measure interfacial tension between homogeneous phase microemulsion/water interfacial tension and microemulsion/Changqing oilfields five Li Wan mono-district crude oil.
4, increasing injection ability measurement: the injection pressure after utilizing water-flooding pressure before and after core experiment measurement injection 0.2PV homogeneous phase microemulsion slug to stablize.
5, oil recovery factor ability measurement is improved: utilize core experiment to measure and inject homogeneous phase microemulsion continuously and inject 0.2PV homogeneous phase microemulsion slug and improve recovery ratio ability.
Result is as shown in the table:
| Product appearance | Light blue transparent |
| Particle diameter | 40～50nm |
| Thermodynamic stability | Evenly, transparent, non-layering |
| Homogeneous phase microemulsion and oily interfacial tension | 4.42×10 -3mN/m |
| The interfacial tension of homogeneous phase microemulsion and water | 3.12×10 -3mN/m |
| Step-down rate | 48.3％ |
| Continuous injection microemulsion improves oil recovery factor value | 98.7％ |
| Inject 0.2PV microemulsion slug and improve oil recovery factor value | 18.7％ |
Result shows, microemulsion particle diameter is nano level, has good injection in low-permeability oil deposit.Under 90 DEG C of high temperature, there is not layering in microemulsion, has good thermodynamic stability.Microemulsion does not mix with between oil, aqueous phase.After injecting microemulsion, water drive step-down filter reaches 48.3%, and oil recovery factor is obviously promoted.
In the present invention, compound surfactant can be formed with aniorfic surfactant and nonionic surface active agent compound system, wherein, aniorfic surfactant is sodium lauryl sulphate, nonionic surface active agent is alkylol amide Soxylat A 25-7, aniorfic surfactant and nonionic surface active agent mass ratio are 4:1, and add auxiliary agent sodium-chlor formation compound system, and sodium-chlor quality is 0.2% of two kinds of tensio-active agent total masses.
Claims (10)
1. one kind is applied to the homogeneous phase microemulsion flooding agent of low permeability oil field, it is characterized in that, oil and water volume ratio are 1:1, the mass percent that each concentration of component accounts for profit total amount by this constituent mass represents, wherein: compound surfactant concentration 2% ~ 3.5%, cosurfactant concentration 4.5% ~ 11%, electrolyte concentration 2.5% ~ 8.5%.
2. be applied to the homogeneous phase microemulsion flooding agent of low permeability oil field according to claim 1, it is characterized in that, described oil is C
7-C
9normal paraffin, the equivalent alkane carbon number equal principle of based on crude is selected.
3. be applied to the homogeneous phase microemulsion flooding agent of low permeability oil field according to claim 2, it is characterized in that, described normal paraffin is normal heptane, octane or n-nonane.
4. be applied to the homogeneous phase microemulsion flooding agent of low permeability oil field according to claim 1, it is characterized in that, described compound surfactant is aniorfic surfactant and nonionic surface active agent compound system.
5. be applied to the homogeneous phase microemulsion flooding agent of low permeability oil field according to claim 4, it is characterized in that, described aniorfic surfactant is sodium lauryl sulphate, described nonionic surface active agent is alkylol amide Soxylat A 25-7, aniorfic surfactant and nonionic surface active agent mass ratio are 4:1, and adding sodium-chlor formation compound system, sodium-chlor quality is 0.2% of two kinds of tensio-active agent total masses.
6. be applied to the homogeneous phase microemulsion flooding agent of low permeability oil field according to claim 1, it is characterized in that, described cosurfactant is low-carbon (LC) alcohols.
7. be applied to the homogeneous phase microemulsion flooding agent of low permeability oil field according to claim 6, it is characterized in that, described low-carbon (LC) alcohols is propyl alcohol, propyl carbinol, isopropylcarbinol or amylalcohol.
8. be applied to the homogeneous phase microemulsion flooding agent of low permeability oil field according to claim 1, it is characterized in that, described ionogen is the mixture with positive monovalent sodium salt, positive divalence calcium salt or these two kinds of salt different ratioss.
9. be applied to the homogeneous phase microemulsion flooding agent of low permeability oil field according to claim 8, it is characterized in that, described positive monovalent sodium salt is NaCl or NaNO
3, positive divalence calcium salt is CaCl
2.
10. described in a claim 1, be applied to the preparation method of the homogeneous phase microemulsion flooding agent of low permeability oil field, it is characterized in that, first, oil and water is got by described volume ratio, next, take compound surfactant in proportion respectively and the two is mixed into milk sap by ionogen, then in milk sap, adds cosurfactant in proportion, be stirred to evenly with 250 revs/min of rotating speeds, leave standstill and obtain homogeneous phase microemulsion.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110157403A (en) * | 2019-05-08 | 2019-08-23 | 中国石油大学(北京) | A kind of low-permeability oil deposit oil displacement agent |
| CN113214815A (en) * | 2021-05-07 | 2021-08-06 | 大庆永铸石油技术开发有限公司 | Nano microemulsion oil displacement agent and preparation method thereof |
| CN113563861A (en) * | 2021-07-27 | 2021-10-29 | 中国石油大学(北京) | Microemulsion composition, nano emulsion, preparation method and application of nano emulsion, and fracturing fluid |
| CN114836185A (en) * | 2022-05-23 | 2022-08-02 | 西南石油大学 | In-situ spontaneous tackifying thickened oil displacement system and preparation method thereof |
| CN115926769A (en) * | 2022-11-30 | 2023-04-07 | 盘锦鸿鼎油气技术服务有限公司 | Oil displacement agent and preparation method thereof |
| CN116103029A (en) * | 2021-11-10 | 2023-05-12 | 中国石油天然气集团有限公司 | Microemulsion system and preparation and application thereof |
| CN116987494A (en) * | 2022-04-25 | 2023-11-03 | 中国石油化工股份有限公司 | Microemulsion imbibition oil extraction agent and preparation method and application method thereof |
| CN117511528A (en) * | 2023-10-18 | 2024-02-06 | 碳中能源科技(北京)有限公司 | Preparation method and application of compound microemulsion |
| WO2024088444A1 (en) * | 2022-10-27 | 2024-05-02 | 中国石油天然气股份有限公司 | Middle-phase microemulsion, and preparation method therefor and use thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110157403A (en) * | 2019-05-08 | 2019-08-23 | 中国石油大学(北京) | A kind of low-permeability oil deposit oil displacement agent |
| CN113214815A (en) * | 2021-05-07 | 2021-08-06 | 大庆永铸石油技术开发有限公司 | Nano microemulsion oil displacement agent and preparation method thereof |
| CN113214815B (en) * | 2021-05-07 | 2023-06-23 | 大庆永铸石油技术开发有限公司 | Nanometer microemulsion oil displacement agent and preparation method thereof |
| CN113563861A (en) * | 2021-07-27 | 2021-10-29 | 中国石油大学(北京) | Microemulsion composition, nano emulsion, preparation method and application of nano emulsion, and fracturing fluid |
| CN113563861B (en) * | 2021-07-27 | 2022-12-23 | 中国石油大学(北京) | Microemulsion composition, nano emulsion, preparation method and application of nano emulsion, and fracturing fluid |
| CN116103029A (en) * | 2021-11-10 | 2023-05-12 | 中国石油天然气集团有限公司 | Microemulsion system and preparation and application thereof |
| CN116987494A (en) * | 2022-04-25 | 2023-11-03 | 中国石油化工股份有限公司 | Microemulsion imbibition oil extraction agent and preparation method and application method thereof |
| CN114836185A (en) * | 2022-05-23 | 2022-08-02 | 西南石油大学 | In-situ spontaneous tackifying thickened oil displacement system and preparation method thereof |
| WO2024088444A1 (en) * | 2022-10-27 | 2024-05-02 | 中国石油天然气股份有限公司 | Middle-phase microemulsion, and preparation method therefor and use thereof |
| CN115926769A (en) * | 2022-11-30 | 2023-04-07 | 盘锦鸿鼎油气技术服务有限公司 | Oil displacement agent and preparation method thereof |
| CN117511528A (en) * | 2023-10-18 | 2024-02-06 | 碳中能源科技(北京)有限公司 | Preparation method and application of compound microemulsion |
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