CN114716986A - High-selectivity nano silicon oxide controlled water emulsion and preparation method thereof - Google Patents
High-selectivity nano silicon oxide controlled water emulsion and preparation method thereof Download PDFInfo
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- CN114716986A CN114716986A CN202210204209.4A CN202210204209A CN114716986A CN 114716986 A CN114716986 A CN 114716986A CN 202210204209 A CN202210204209 A CN 202210204209A CN 114716986 A CN114716986 A CN 114716986A
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Abstract
The invention provides a high-selectivity nano silicon oxide controlled water emulsion and a preparation method thereof, wherein a surfactant is dissolved in a polar solvent and uniformly mixed to obtain a surfactant polar solution; uniformly mixing nano silicon oxide particles, a dispersing agent and a nonpolar solvent to obtain a nano particle dispersion liquid; and (2) uniformly mixing the polar solution of the surfactant prepared in the step (1) with the nano-particle dispersion liquid prepared in the step (2), carrying out high-speed shearing treatment on the mixture, emulsifying the mixture at the emulsifying temperature of 40-50 ℃ for 20-30min, stirring and cooling the mixture to room temperature of 20-25 ℃ to obtain the high-selectivity nano-silicon oxide controlled water emulsion. The nano silicon oxide water control emulsion prepared by the method has uniform emulsion droplet size, certain temperature resistance and salt tolerance, and strong selectivity, and can effectively improve the selective water control and blocking effect of a high-temperature and high-permeability reservoir compared with the traditional blocking agent.
Description
Technical Field
The invention relates to the technical field of oilfield exploitation, in particular to a high-selectivity nano silicon oxide controlled water emulsion and a preparation method thereof.
Background
Chemical water shutoff is an important measure for reducing the water content of an oil well and improving the yield of the oil well. Due to the existence of stratum heterogeneity, with the continuous deepening of oil field development, premature flooding of a high-permeability section between injection and production wells is inevitably caused, so that the spread degree of injected water is reduced, the water content of an oil well is increased, even flooding is caused, and the oil field development effect is influenced. Meanwhile, with the extension of the development period, the working state of the underground pipe column is deteriorated year by year, many oil wells cannot realize normal blocking, part of single well interlayer cement sheath is broken, and the interlayer groove crossing phenomenon is serious; the application of the non-selective water plugging technology is limited to a certain extent due to the existence of interlayer water, unclear water outlet layer position and the like.
On the other hand, the current selective plugging agent is limited by high-temperature high-salt and compressive strength, the action effect is limited especially for a high-temperature high-permeability (more than 90 ℃ and more than 2000mD) reservoir, and the silicon-containing plugging agent has the advantages of temperature resistance, salt resistance, difficulty in degradation, strength controllability and the like, and has the potential of improving the water control effect of a high-temperature high-salinity stratum and plugging a high-permeability zone in a deep part; meanwhile, the nano material is selectively applied by considering economic benefits according to oil reservoir conditions, and is a very interesting topic. The nano silicon oxide is an inorganic nano material which is researched more at present, has small particle size, large specific surface area and strong surface adsorption force, and has great potential in oil extraction in oil fields, so that the preparation method of the high-selectivity nano silicon oxide water-control emulsion is provided.
Disclosure of Invention
The invention overcomes the defects in the prior art, the existing selective plugging agent is limited by high-temperature high-salt and compressive strength, and particularly has limited action effect on a high-temperature high-permeability reservoir, and provides the high-selectivity nano-silica controlled-water emulsion and the preparation method thereof.
The purpose of the invention is realized by the following technical scheme.
A high-selectivity nano silicon oxide controlled water emulsion and a preparation method thereof are carried out according to the following steps:
step 1, dissolving a surfactant in a polar solvent, and uniformly mixing to obtain a surfactant polar solution;
step 2, uniformly mixing the nano silicon oxide particles, a dispersing agent and a non-polar solvent to obtain a nano particle dispersion liquid;
and 3, uniformly mixing the polar solution of the surfactant prepared in the step 1 with the nano-particle dispersion liquid prepared in the step 2, carrying out high-speed shearing treatment on the mixture, emulsifying the mixture at the emulsifying temperature of 40-50 ℃ for 20-30min, and stirring and cooling the mixture to room temperature of 20-25 ℃ to obtain the high-selectivity nano silicon oxide controlled water emulsion.
In step 1, anionic surfactants and nonionic surfactants are used as the surfactants.
In step 1, the polar solvent is water.
In the step 1, when the surfactant is mixed with the polar solvent, the mass percentage of the surfactant in the polar solvent is 10-20%.
In step 2, the aggregate state macro size of the nano silicon oxide particles is less than or equal to 10 μm, and the surfaces of the nano silicon oxide particles are hydrophobic.
In the step 2, the nonpolar solvent comprises mineral oil such as diesel oil, solvent oil, kerosene and the like, wherein the mass ratio of the polar solvent to the nonpolar solvent is 1: 1.
in step 2, the total mass fraction of the nano silicon oxide particles in the nano particle dispersion liquid is less than or equal to 1.5%.
In step 3, the shear rate was 7000-12000 r/min.
The invention has the beneficial effects that: according to the invention, through the aggregation and aging effects of the nano silica particles, a high-strength inorganic nano silica particle cementing structure is formed in an oil reservoir, so that the reservoir structure can be effectively improved, and the water plugging efficiency is realized;
according to the invention, the two phases of the mixture are mixed and emulsified to obtain the micro-nano milky liquid, so that the construction requirement of the medicament is ensured, and meanwhile, the size of emulsion droplets of the emulsion can be regulated and controlled according to the reservoir conditions, and the nanoparticles are mutually bonded, so that the water plugging effect of the reservoir is realized;
because the emulsion adopts inorganic silicon oxide nano material, the damage to a reservoir stratum is low; hydrophobic silica particles in the emulsion droplets are mutually interacted and coalesced to construct a viscous colloidal inorganic nano particle assembly, and reservoir transformation is realized after emulsion breaking, so that a selective water control effect is exerted.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
Example 1
A high-selectivity nano silicon oxide controlled water emulsion and a preparation method thereof are carried out according to the following steps:
s1, collecting the desired materials, the emulsion materials comprising: the nano silicon oxide material is 5 mu m in aggregation state size;
s2, mixing 3.7g of anionic ammonium sulfate surfactant and 30g of pure water uniformly;
s3, mixing the nano silicon oxide and mineral oil uniformly, wherein the total mass fraction of the nano silicon oxide is 1.5 wt%, and the mass of the mineral oil is 30 g;
s4, adding 2.2g of dispersant monooleate into the mixture obtained in the S3, fully mixing, and then emulsifying, wherein the emulsifying temperature is 40-50 ℃, the emulsifying time is 20-30min, and the shearing rate is 10000 r/min;
s5, fully stirring the mixture to room temperature after emulsification is finished, thereby obtaining stable milky white solution, namely the high-selectivity nano silicon oxide controlled water emulsion.
Example 2
A high-selectivity nano silicon oxide controlled water emulsion and a preparation method thereof are carried out according to the following steps:
s1, collecting the desired materials, the emulsion materials comprising: the nano silicon oxide material is 5 mu m in aggregation state size;
s2, mixing 3.7g of anionic ammonium sulfate surfactant and 30g of pure water uniformly;
s3, mixing the nano silicon oxide and mineral oil uniformly, wherein the total mass fraction of the nano silicon oxide is 1.2 wt%, and the mass of the mineral oil is 30 g;
s4, adding 2.2g of dispersant monooleate into the mixture obtained in the S3, fully mixing, and then emulsifying, wherein the emulsifying temperature is 40-50 ℃, the emulsifying time is 20-30min, and the shearing rate is 9000 r/min;
s5, fully stirring the mixture to room temperature after emulsification is finished, thereby obtaining stable milky white solution, namely the high-selectivity nano silicon oxide controlled water emulsion.
Example 3
A high-selectivity nano silicon oxide controlled water emulsion and a preparation method thereof are carried out according to the following steps:
s1, collecting the desired materials, the emulsion materials comprising: the nano silicon oxide material is 5 mu m in aggregation state size;
s2, mixing 3.7g of anionic ammonium sulfate surfactant and 30g of pure water uniformly;
s3, mixing the nano silicon oxide and mineral oil uniformly, wherein the total mass fraction of the nano silicon oxide is 1 wt%, and the mass of the mineral oil is 30 g;
s4, adding 2.2g of dispersant monooleate into the mixture obtained in the S3, fully mixing, and then emulsifying at the emulsifying temperature of 40-50 ℃, for 20-30min and at the shearing rate of 7000 r/min;
s5, fully stirring the mixture to room temperature after emulsification is finished, thereby obtaining stable milky white solution, namely the high-selectivity nano silicon oxide controlled water emulsion.
Evaluation test of the performance of the water-control emulsion of the high-selectivity nano silicon oxide water-control emulsion:
the performance of the product is evaluated by using the highly selective nano silicon oxide water-control emulsion prepared in the embodiment 1-3 and by referring to the SY/T5590-plus 2004 profile control agent performance evaluation method of the national industry standard and the performance parameter determination experiment program of the prepared water-control emulsion, and testing the change condition of the oil-water two-phase permeability of the core in the displacement test before and after the water-control emulsion is injected.
The method is characterized in that the gas logging permeability of the selected rock core is 2000 mD-4000 mD, the size is phi 25mm x 70mm, the injection amount is within 2PV, the experimental temperature is 30 ℃, and the injected water is simulated underground water (the mineralization is 30000-40000 mg/L); after the emulsion is injected, the effect evaluation is carried out after the emulsion is aged for 24 hours at 120 ℃.
The test results of the high selectivity nano-silica controlled-water emulsion prepared in examples 1-3 on different permeability experiments of the experimental sand-packed pipe are shown in table 1:
table 1 results of different permeability experiments of sand-packed pipe in sample experiment of example
The emulsion injection concentration was 20%, and the samples (i.e., the highly selective nano-sized controlled-silica emulsions prepared in examples 1-3) were tested after aging at 120 ℃ for 24 hours.
The product of the invention has excellent selectivity for a high-temperature and medium-high permeability reservoir, and when the high-selectivity nano silicon oxide controlled water emulsion is used for carrying out chemical water plugging operation on the high-temperature and high-permeability reservoir, the plugging rate of a water phase is more than 80 percent, and the plugging rate of an oil phase is less than 20 percent.
The invention has been described in an illustrative manner, and it is to be understood that any simple variations, modifications or other equivalent changes which can be made by one skilled in the art without departing from the spirit of the invention fall within the scope of the invention.
Claims (9)
1. A high-selectivity nano silicon oxide controlled water emulsion is characterized in that: the method comprises the following steps:
step 1, dissolving a surfactant in a polar solvent, and uniformly mixing to obtain a surfactant polar solution;
step 2, uniformly mixing the nano silicon oxide particles, the dispersing agent and the nonpolar solvent to obtain nano particle dispersion liquid;
and 3, uniformly mixing the polar solution of the surfactant prepared in the step 1 with the nano-particle dispersion liquid prepared in the step 2, carrying out high-speed shearing treatment on the mixture, completing emulsification at the emulsification temperature of 40-50 ℃ for 20-30min, stirring the mixture obtained after emulsification, and cooling the mixture to the room temperature of 20-25 ℃ to obtain the high-selectivity nano-silica controlled water emulsion.
2. The high selectivity nano silicon oxide controlled water emulsion as claimed in claim 1, wherein: in the step 1, the surfactant adopts an anionic surfactant and a nonionic surfactant, the polar solvent is water, and when the surfactant and the polar solvent are mixed, the mass percentage of the surfactant in the polar solvent is 10-20%.
3. The high selectivity nano silicon oxide controlled water emulsion as claimed in claim 1, wherein: in step 2, the agglomerated macro size of the nano silicon oxide particles is less than or equal to 10 μm, the surfaces of the nano silicon oxide particles are hydrophobic, and the nonpolar solvent comprises diesel oil, solvent oil or kerosene, wherein the mass ratio of the polar solvent to the nonpolar solvent is 1: 1, the total mass fraction of the nano silicon oxide particles in the nano particle dispersion liquid is less than or equal to 1.5 percent.
4. The high selectivity nano silicon oxide controlled water emulsion as claimed in claim 1, wherein: in step 3, the shear rate was 7000-and 12000 r/min.
5. A process for preparing a high selectivity nano silica controlled water emulsion as claimed in any one of claims 1 to 4, wherein: the method comprises the following steps:
step 1, dissolving a surfactant in a polar solvent, and uniformly mixing to obtain a surfactant polar solution;
step 2, uniformly mixing the nano silicon oxide particles, the dispersing agent and the nonpolar solvent to obtain nano particle dispersion liquid;
and 3, uniformly mixing the polar solution of the surfactant prepared in the step 1 with the nano-particle dispersion liquid prepared in the step 2, carrying out high-speed shearing treatment on the mixture, completing emulsification at the emulsification temperature of 40-50 ℃ for 20-30min, stirring the mixture obtained after emulsification, and cooling the mixture to the room temperature of 20-25 ℃ to obtain the high-selectivity nano-silica controlled water emulsion.
6. The method for preparing high selectivity nano silicon oxide controlled water emulsion according to claim 5, wherein the method comprises the following steps: in the step 1, the surfactant adopts an anionic surfactant and a nonionic surfactant, the polar solvent is water, and when the surfactant and the polar solvent are mixed, the mass percentage of the surfactant in the polar solvent is 10-20%.
7. The method for preparing high selectivity nano silicon oxide controlled water emulsion according to claim 5, wherein the method comprises the following steps: in step 2, the agglomerated macro size of the nano silicon oxide particles is less than or equal to 10 μm, the surfaces of the nano silicon oxide particles are hydrophobic, and the nonpolar solvent comprises diesel oil, solvent oil or kerosene, wherein the mass ratio of the polar solvent to the nonpolar solvent is 1: 1, the total mass fraction of the nano silicon oxide particles in the nano particle dispersion liquid is less than or equal to 1.5 percent.
8. The method for preparing high selectivity nano silicon oxide controlled water emulsion according to claim 5, wherein the method comprises the following steps: in step 3, the shear rate was 7000-12000 r/min.
9. The application of the high selectivity nano silicon oxide controlled water emulsion in the field of chemical water shutoff in oil fields as claimed in any one of claims 1 to 4, which is characterized in that: when the high-selectivity nano silicon oxide controlled water emulsion is used for carrying out chemical water plugging operation on a high-temperature and high-permeability reservoir, the plugging rate of a water phase is more than 80 percent, and the plugging rate of an oil phase is less than 20 percent.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107434970A (en) * | 2016-05-27 | 2017-12-05 | 中国石油化工股份有限公司 | A kind of nano particle emulsion thickener and preparation method thereof |
| CN113122208A (en) * | 2021-04-13 | 2021-07-16 | 中国石油大学(华东) | Ethylene tar-based water-in-oil type emulsion water shutoff agent and preparation method and application thereof |
| CN113717704A (en) * | 2021-08-07 | 2021-11-30 | 天津市雄冠科技发展有限公司 | Preparation method of intelligent profile control agent for oil field |
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- 2022-03-02 CN CN202210204209.4A patent/CN114716986A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107434970A (en) * | 2016-05-27 | 2017-12-05 | 中国石油化工股份有限公司 | A kind of nano particle emulsion thickener and preparation method thereof |
| CN113122208A (en) * | 2021-04-13 | 2021-07-16 | 中国石油大学(华东) | Ethylene tar-based water-in-oil type emulsion water shutoff agent and preparation method and application thereof |
| CN113717704A (en) * | 2021-08-07 | 2021-11-30 | 天津市雄冠科技发展有限公司 | Preparation method of intelligent profile control agent for oil field |
Non-Patent Citations (1)
| Title |
|---|
| 李刚辉等: ""柴油基纳米粒子乳液的制备及其堵水性能研究"" * |
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