CN106893571B - A kind of oil-in-water emulsion oil displacement agent - Google Patents
A kind of oil-in-water emulsion oil displacement agent Download PDFInfo
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- CN106893571B CN106893571B CN201710123722.XA CN201710123722A CN106893571B CN 106893571 B CN106893571 B CN 106893571B CN 201710123722 A CN201710123722 A CN 201710123722A CN 106893571 B CN106893571 B CN 106893571B
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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
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
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Abstract
The invention discloses a kind of oil-in-water emulsion oil displacement agents, improve recovery ratio for crude oil chemical flooding.The oil-in-water emulsion oil displacement agent is mixed by accounting for the nano silicon dioxide sol of total weight 1-5%, the octadecyl dimethyl amine oxide for accounting for total weight 0.02-0.2%, No. 5 white oils for accounting for total weight 5-10% and excess water, wherein the partial size of nano silicon dioxide sol is 7-12nm, and the sum of weight percentage of each component is 100%.Viscosity and stability that nano silica enhances oil-in-water emulsion is added, which not only can be improved the displacement efficiency of chemical flooding, but also improve sweep efficiency, and as oil displacement agent used for tertiary oil recovery, 30% or more recovery ratio can be improved on the basis of water drive.
Description
Technical field:
The present invention relates to a kind of crude oil chemical oil displacement agent, especially nano particle reinforced oil-in-water oil displacement system belongs to
Improve recovery efficiency technique field.
Background technique:
Chemical flooding technology is that China oil field is further afterwards in primary oil recovery (self-spray production) and secondary oil recovery (waterflooding extraction)
The main method of oil recovery rate is improved, the mechanism that chemical flooding improves recovery ratio has two: first is that by increasing oil displacement system viscosity
Sweep efficiency is improved, second is that improving displacement efficiency by reducing oil water interfacial tension and changing the wetability on stratum.
Although it is (indoor that the desk research and filed application for chemical flooding all achieve the preferable effect for improving recovery ratio
Experiments have shown that chemical flooding can further increase 20% or more oil recovery factor on the basis of water drive), but current change
It learns to drive and but exposes many problems in filed application:
(1) oil displacement system, which mainly passes through, is added the viscosity that polymer (HPAM) increases solution, but in polymer solution
During configuring, being pumped into, since shear action makes its viscosity loss after entering stratum be more than 60-70%, the shearing of polymer
Degradation seriously reduces the effect of chemical flooding, thus in order to guarantee into stratum oil displacement system can viscosity with higher,
It needs to considerably increase the cost of chemical flooding in this way using systems with high concentration of polymer.
(2) oil displacement system containing polymer is residual in injection well and producing well near wellbore zone during long-term injection
The polymer stayed, which crosslinks, causes formation blockage, and uses oxidizer system to carry out de-plugging operation and not only there is security risk,
The validity period of de-plugging simultaneously is shorter, seriously affects grease well capacity.
The oil-in-water emulsion formed by surfactant, white oil and water has certain washing oil ability, while
The sweep efficiency of oil displacement agent can be improved by the Jamin effect of emulsion, therefore can effectively overcome traditional chemical displacement of reservoir oil body
The shortcomings that being, compared with the stable emulsion of surfactant, by the emulsion of nanoparticle and surfactant jointly stabilizing,
The stability that dosage of surfactant can be greatly lowered, emulsion is greatly improved.
Summary of the invention:
In view of the deficiencies of the prior art, it is an object of the present invention to provide the water of a kind of surfactant and nanoparticles stable
Packet oil emulsion oil displacement agent.
The object of the present invention is achieved like this: the nanometer two that oil-in-water emulsion oil displacement agent is 7-12nm by original particle size
Silica sol, No. 5 white oils, octadecyl dimethyl amine oxide and water are constituted, wherein nano silicon dioxide sol accounts for total weight
1-5%, octadecyl dimethyl amine oxide accounts for the 0.02-0.2% of total weight, and No. 5 white oils account for the 5-10% of total weight, remaining
Amount is water, and the sum of weight percentage of each component is 100%.
Based on above-mentioned formula, inventor has investigated nano silicon dioxide sol and the stable oil-in-water of surfactant
The stability of emulsion, viscosity and the ability for improving oil recovery factor, discovery temperature be 20 DEG C, shearing rate 7.34s-1Item
Under part, the viscosity of system reaches 50-100mPa.s, and stablizing the time is more than 60 days, adopts to the crude oil that 55 DEG C of viscosity are 38mPas
It is about 2000 × 10 with permeability-3μm2Sandstone Cores 30% or more recovery ratio can be improved on the basis of water drive, be a kind of
Effective chemistry displacement system.
The beneficial effects of the present invention are: due to using nano silicon dioxide sol and surfactant stable emulsion,
The viscosity and stability of emulsion system are improved, compared with prior art, the present invention has the advantage that
(1) the problem of overcoming the oil displacement system of polymer viscosified is reduced in injection process by failure by shear viscosity,
It is easy to inject since the viscosity of emulsion can reduce at high shear rates, and the displacement of reservoir oil after shear rate reduces after entering stratum
The viscosity of agent system can be restored, while emulsion relies primarily on Jamin effect and improves sweep efficiency, so the variation pair of viscosity
Its capacity for improving sweep efficiency is weaker.
(2) poor by the stable emulsion stability of surfactant merely, surfactant adsorption will lead to cream
The demulsification of shape liquid, and the absorption of nano silicon dioxide sol in the earth formation is weaker, the emulsion liquid film intensity of formation is higher, and stability is big
Amplitude improves.
Specific embodiment:
The present invention is further illustrated below by embodiment.
Embodiment 1
1g nano silicon dioxide sol, 0.02g octadecyl dimethyl amine oxide and No. 5 white oil 5g are weighed to be added to
In 93.98g water, 10 minutes formation oil-in-water emulsions are stirred under 3000 revs/min.With Brookfield viscosimeter measurement 20
Shear rate is 7.34s at DEG C-1The viscosity of lower system is 56.3mPa.s, and the stable time reaches 63 days, uses permeability for 1950
×10-3μm2Fill out sand tube have rated the Oil Displacing Capacity of system, the results are shown in Table 1, it can be seen that Emuision Sweep system improves harvesting
Rate 43.91%.
The nano particle reinforced surfactant micellar oil displacement system of table 1 improves recovery ratio effect
| Permeability/× 10-3μm2 | Initial oil saturation, % | Waterflood recovery efficiency factor, % | Emulsion drives recovery ratio, % | Overall recovery efficiency, % |
| 1950 | 89.97 | 34.14 | 43.91 | 78.05 |
Embodiment 2
It weighs 3g nano silicon dioxide sol, 0.1g octadecyl dimethyl amine oxide and No. 5 white oil 7g and is added to 89.9g
In water, 10 minutes formation oil-in-water emulsions are stirred under 3000 revs/min.It is measured with Brookfield viscosimeter and is cut at 20 DEG C
Cutting speed rate is 7.34s-1The viscosity of lower system is 83.4mPa.s, and the stable time reaches 68 days, uses permeability for 1950 × 10-3
μm2Fill out sand tube have rated the Oil Displacing Capacity of system, the results are shown in Table 1, it can be seen that Emuision Sweep system improves recovery ratio
38.94%.
The nano particle reinforced surfactant micellar oil displacement system of table 2 improves recovery ratio effect
| Permeability/× 10-3μm2 | Initial oil saturation, % | Waterflood recovery efficiency factor, % | Emulsion drives recovery ratio, % | Overall recovery efficiency, % |
| 1980 | 87.6 | 29.39 | 38.94 | 68.33 |
Embodiment 3
5g nano silicon dioxide sol, 0.2g octadecyl dimethyl amine oxide and No. 5 white oil 10g are weighed to be added to
In 84.8g water, 10 minutes formation oil-in-water emulsions are stirred under 3000 revs/min.With Brookfield viscosimeter measurement 20
Shear rate is 7.34s at DEG C-1The viscosity of lower system be 102.8mPa.s, stablize the time reach 71 days, use permeability for
1950×10-3μm2Fill out sand tube have rated the Oil Displacing Capacity of system, the results are shown in Table 1, it can be seen that Emuision Sweep system improves
Recovery ratio 47.03%.
The nano particle reinforced surfactant micellar oil displacement system of table 3 improves recovery ratio effect
| Permeability/× 10-3μm2 | Initial oil saturation, % | Waterflood recovery efficiency factor, % | Emulsion drives recovery ratio, % | Overall recovery efficiency, % |
| 2034 | 85.31 | 31.53 | 47.03 | 78.56 |
Dosage of surfactant is reduced by the emulsion of nanoparticle and surfactant jointly stabilizing, while greatly being mentioned
The stability of high emulsion shows the ability of excellent raising oil recovery factor.
Claims (1)
1. a kind of oil-in-water emulsion oil displacement agent, characterized in that by original particle size be 7-12nm nano silicon dioxide sol, 5
Number white oil, octadecyl dimethyl amine oxide and water are constituted, wherein and nano silicon dioxide sol accounts for the 1-5% of total weight, and 18
Alkyl dimethyl amine oxide accounts for the 0.02-0.2% of total weight, and No. 5 white oils account for the 5-10% of total weight, and surplus is water, each group
The sum of weight percentage divided is 100%.
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| CN106893571B true CN106893571B (en) | 2019-09-20 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2670808C9 (en) * | 2017-07-21 | 2018-11-28 | Общество с ограниченной ответственностью "ОИЛМАЙНД" | Method for enhancing oil recovery (variants) |
| CN108070368B (en) * | 2018-01-18 | 2020-09-29 | 中国石油大学(华东) | Self-emulsifying emulsion and preparation method thereof |
| US10131556B1 (en) | 2018-04-20 | 2018-11-20 | King Saud University | Hydrophobic nanoparticle compositions for crude oil collection |
| CN112143473B (en) * | 2019-06-27 | 2022-09-30 | 中国石油化工股份有限公司 | Emulsion profile control and flooding agent and preparation method thereof |
| CN112300768B (en) * | 2019-07-23 | 2022-09-23 | 中国石油化工股份有限公司 | Nanoparticle-reinforced residual oil emulsion profile control and flooding agent and preparation method thereof |
| CN112694874B (en) * | 2020-12-25 | 2021-11-02 | 成都理工大学 | Solid-liquid reciprocating phase change deep liquid flow diverting agent |
| CN114437695B (en) * | 2021-12-22 | 2023-05-12 | 中国石油天然气集团有限公司 | Microemulsion multifunctional nano oil displacement agent and preparation method and application thereof |
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| CN1089846C (en) * | 1997-05-23 | 2002-08-28 | 埃克森生产研究公司 | Oil recovery method using an emulsion |
| CN104178099A (en) * | 2013-05-22 | 2014-12-03 | 中国石油化工股份有限公司 | Heat resistant and salt tolerant nano emulsion, and preparation method and application thereof |
| CN104419395A (en) * | 2013-08-20 | 2015-03-18 | 中国石油化工股份有限公司 | Temperature-resistant salt-tolerance nano emulsion used in tertiary oil recovery and preparation method thereof |
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2017
- 2017-03-03 CN CN201710123722.XA patent/CN106893571B/en not_active Expired - Fee Related
Patent Citations (3)
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| CN1089846C (en) * | 1997-05-23 | 2002-08-28 | 埃克森生产研究公司 | Oil recovery method using an emulsion |
| CN104178099A (en) * | 2013-05-22 | 2014-12-03 | 中国石油化工股份有限公司 | Heat resistant and salt tolerant nano emulsion, and preparation method and application thereof |
| CN104419395A (en) * | 2013-08-20 | 2015-03-18 | 中国石油化工股份有限公司 | Temperature-resistant salt-tolerance nano emulsion used in tertiary oil recovery and preparation method thereof |
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| 纳米SiO2和表面活性剂协同稳定的水包油乳状液驱油机性能研究;葛际江;《科学技术与工程》;20150918;165-170 * |
| 纳米SiO2和表面活性剂协同稳定的水包油乳状液驱油机理研究;韩国彤;《材料导报》;20151125;2.1 乳状液性能评价 * |
| 纳米硅胶体系驱油理论与数学建模;鞠斌山;《新疆石油与地质》;20060401;第27卷(第2期);1 纳米硅胶体系驱油理论分析 * |
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