CN106893571A - 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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- CN106893571A CN106893571A CN201710123722.XA CN201710123722A CN106893571A CN 106893571 A CN106893571 A CN 106893571A CN 201710123722 A CN201710123722 A CN 201710123722A CN 106893571 A CN106893571 A CN 106893571A
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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
Abstract
The invention discloses a kind of oil-in-water emulsion oil displacement agent, recovery ratio is improved for crude oil chemical flooding.Described oil-in-water emulsion oil displacement agent is mixed by the nano silicon dioxide sol for accounting for gross weight 1 5%, the octadecyl dimethyl amine oxide for accounting for gross weight 0.02 0.2%, No. 5 white oils and excess water that account for gross weight 5 10%, wherein the particle diameter of nano silicon dioxide sol is 7 12nm, and the weight percentage sum of each component is 100%.Nano silicon is added to enhance the viscosity and stability of oil-in-water emulsion, the emulsion can both improve the displacement efficiency of chemical flooding, sweep efficiency is improve again, as oil displacement agent used for tertiary oil recovery, recovery ratio more than 30% 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, particularly nano particle reinforced oil-in-water oil displacement system belongs to
Improve recovery efficiency technique field.
Background technology：
Chemical flooding technology is China oil field further afterwards in primary oil recovery (blowing 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：One is by increasing oil displacement system viscosity
To improve sweep efficiency, two is to improve displacement efficiency by reducing the wetability of oil water interfacial tension and change stratum.
Although the desk research and filed application for chemical flooding all achieve the effect (interior of preferably raising recovery ratio
Experiment shows that chemical flooding can further improve more than 20% oil recovery factor on the basis of water drive), but current change
Learn to drive and many problems are but exposed in filed application：
(1) oil displacement system mainly increases the viscosity of solution by adding polymer (HPAM), but in polymer solution
During configuring, pumping into, due to shear action make its after stratum is entered viscosity loss more than 60-70%, the shearing of polymer
The serious effect for reducing chemical flooding of degraded, therefore in order to ensure that the oil displacement system for entering stratum can have viscosity higher,
Need to use systems with high concentration of polymer, so considerably increase the cost of chemical flooding.
(2) oil displacement system containing polymer is residual in injection well and producing well near wellbore zone during long-term injection
The polymer for staying is crosslinked and causes formation blockage, and is carried out de-plugging operation using oxidizer system and not only be there is security risk,
The term of validity of de-plugging simultaneously is shorter, has a strong impact on profit well capacity.
The oil-in-water emulsion formed by surfactant, white oil and water i.e. with certain washing oil ability, while
The Jamin effect of emulsion can be relied on to improve the sweep efficiency of oil displacement agent, therefore can effectively overcome traditional chemical displacement of reservoir oil body
The shortcoming of system, compared with the emulsion of surfactant stabilization, by nano-particle and the emulsion of surfactant jointly stabilizing,
Dosage of surfactant can be greatly lowered, the stability of emulsion is greatly improved.
The content of the invention：
The purpose of the present invention is directed to the deficiencies in the prior art, there is provided the water of a kind of surfactant and nanoparticles stable
Bag oil emulsion oil displacement agent.
The object of the present invention is achieved like this：Oil-in-water emulsion oil displacement agent is the nanometer two of 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 gross weight
1-5%, octadecyl dimethyl amine oxide accounts for the 0.02-0.2% of gross weight, and No. 5 white oils account for the 5-10% of gross weight, remaining
It is water to measure, and the weight percentage sum of each component is 100%.
Based on above-mentioned formula, inventor has investigated the oil-in-water of nano silicon dioxide sol and surfactant stabilization
The stability of emulsion, viscosity and improve the ability of oil recovery factor, find temperature be 20 DEG C, shearing rate be 7.34s-1Bar
Under part, the viscosity of system reaches 50-100mPa.s, and stabilization time, 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 recovery ratio more than 30% can be improved on the basis of water drive, be a kind of
Effective chemistry displacement system.
The beneficial effects of the invention are as follows：As a result of nano silicon dioxide sol and surfactant stable emulsion,
The viscosity and stability of emulsion system are improve, compared with prior art, the present invention has following advantages：
(1) oil displacement system for overcoming polymer viscosified is subject to the problem of failure by shear viscosity reduction in injection process,
It is easy to injection because the viscosity of emulsion can be reduced at high shear rates, and the displacement of reservoir oil after shear rate reduction after into stratum
The viscosity of agent system can be recovered, while emulsion relies primarily on Jamin effect improves sweep efficiency, so the change of viscosity is right
The capacity that it improves sweep efficiency is weaker.
(2) the simple emulsion stability by surfactant stabilization is poor, and surfactant adsorption can cause breast
Shape liquid is demulsified, and nano silicon dioxide sol absorption in the earth formation is weaker, and the emulsion liquid film intensity of formation is higher, and stability is big
Amplitude is improved.
Specific embodiment：
The present invention is further illustrated below by embodiment.
Embodiment 1
1g nano silicon dioxide sols, 0.02g octadecyl dimethyl amine oxides and No. 5 white oil 5g are weighed to be added to
In 93.98g water, stirred under 3000 revs/min 10 minutes and form oil-in-water emulsion.20 are determined with Brookfield viscosimeters
DEG C down cut speed is 7.34s-1The viscosity of lower system is 56.3mPa.s, and stabilization time reaches 63 days, and it is 1950 to use permeability
×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
| Initial oil saturation, % | Waterflood recovery efficiency factor, % | Emulsion drives recovery ratio, % | Overall recovery factor, % | |
| 1950 | 89.97 | 34.14 | 43.91 | 78.05 |
Embodiment 2
Weigh 3g nano silicon dioxide sols, 0.1g octadecyl dimethyl amine oxides and No. 5 white oil 7g and be added to 89.9g
In water, stirred under 3000 revs/min 10 minutes and form oil-in-water emulsion.Cut at determining 20 DEG C with Brookfield viscosimeters
Cutting speed rate is 7.34s-1The viscosity of lower system is 83.4mPa.s, and stabilization time reaches 68 days, and it is 1950 × 10 to use permeability-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
| Initial oil saturation, % | Waterflood recovery efficiency factor, % | Emulsion drives recovery ratio, % | Overall recovery factor, % | |
| 1980 | 87.6 | 29.39 | 38.94 | 68.33 |
Embodiment 3
5g nano silicon dioxide sols, 0.2g octadecyl dimethyl amine oxides and No. 5 white oil 10g are weighed to be added to
In 84.8g water, stirred under 3000 revs/min 10 minutes and form oil-in-water emulsion.20 are determined with Brookfield viscosimeters
DEG C down cut speed is 7.34s-1The viscosity of lower system is 102.8mPa.s, and stabilization time reaches 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 is improved
Recovery ratio 47.03%.
The nano particle reinforced surfactant micellar oil displacement system of table 3 improves recovery ratio effect
| Initial oil saturation, % | Waterflood recovery efficiency factor, % | Emulsion drives recovery ratio, % | Overall recovery factor, % | |
| 2034 | 85.31 | 31.53 | 47.03 | 78.56 |
Dosage of surfactant is reduced by the emulsion of nano-particle and surfactant jointly stabilizing, while greatly carrying
The stability of emulsion high, shows the ability of excellent raising oil recovery factor.
Claims (1)
1. a kind of oil-in-water emulsion oil displacement agent, it is characterized in that, it is nano silicon dioxide sol, 5 of 7-12nm by original particle size
Number white oil, octadecyl dimethyl amine oxide and water are constituted, wherein, nano silicon dioxide sol accounts for the 1-5% of gross weight, 18
Alkyl dimethyl amine oxide accounts for the 0.02-0.2% of gross weight, and No. 5 white oils account for the 5-10% of gross weight, its balance of water, each group
The weight percentage sum divided is 100%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710123722.XA CN106893571B (en) | 2017-03-03 | 2017-03-03 | A kind of oil-in-water emulsion oil displacement agent |
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| CN201710123722.XA CN106893571B (en) | 2017-03-03 | 2017-03-03 | A kind of oil-in-water emulsion oil displacement agent |
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| CN106893571A true CN106893571A (en) | 2017-06-27 |
| CN106893571B CN106893571B (en) | 2019-09-20 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108070368A (en) * | 2018-01-18 | 2018-05-25 | 中国石油大学(华东) | A kind of self emulsifying emulsions and preparation method thereof |
| US10131556B1 (en) | 2018-04-20 | 2018-11-20 | King Saud University | Hydrophobic nanoparticle compositions for crude oil collection |
| CN110945208A (en) * | 2017-07-21 | 2020-03-31 | 石油智慧有限公司 | Method for increasing oil recovery from a formation (embodiment) |
| CN112143473A (en) * | 2019-06-27 | 2020-12-29 | 中国石油化工股份有限公司 | Emulsion profile control and flooding agent and preparation method thereof |
| CN112300768A (en) * | 2019-07-23 | 2021-02-02 | 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 |
| CN112694874A (en) * | 2020-12-25 | 2021-04-23 | 成都理工大学 | Solid-liquid reciprocating phase change deep liquid flow diverting agent |
| WO2023116389A1 (en) * | 2021-12-22 | 2023-06-29 | 中国石油天然气集团有限公司 | Microemulsion multifunctional nano oil displacing agent and preparation method therefor and application thereof |
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| 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 |
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2017
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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 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110945208A (en) * | 2017-07-21 | 2020-03-31 | 石油智慧有限公司 | Method for increasing oil recovery from a formation (embodiment) |
| CN108070368A (en) * | 2018-01-18 | 2018-05-25 | 中国石油大学(华东) | A kind of self emulsifying emulsions and preparation method thereof |
| US10131556B1 (en) | 2018-04-20 | 2018-11-20 | King Saud University | Hydrophobic nanoparticle compositions for crude oil collection |
| CN112143473A (en) * | 2019-06-27 | 2020-12-29 | 中国石油化工股份有限公司 | Emulsion profile control and flooding agent and preparation method thereof |
| CN112300768A (en) * | 2019-07-23 | 2021-02-02 | 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 |
| 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 |
| CN112694874A (en) * | 2020-12-25 | 2021-04-23 | 成都理工大学 | Solid-liquid reciprocating phase change deep liquid flow diverting agent |
| CN112694874B (en) * | 2020-12-25 | 2021-11-02 | 成都理工大学 | Solid-liquid reciprocating phase change deep liquid flow diverting agent |
| WO2023116389A1 (en) * | 2021-12-22 | 2023-06-29 | 中国石油天然气集团有限公司 | Microemulsion multifunctional nano oil displacing agent and preparation method therefor and application thereof |
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| CN106893571B (en) | 2019-09-20 |
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Granted publication date: 20190920 Termination date: 20200303 |