CN114316935B - Micro-emulsified acid blockage removing system and preparation method thereof - Google Patents
Micro-emulsified acid blockage removing system and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of oil reservoir exploitation, and provides a micro-emulsified acid blockage removing system and a preparation method thereof. The raw materials for preparing the micro-emulsion acid blockage removing system comprise biodegradable surfactant, organic acid, surface assistant, cosolvent, plant-type organic solvent, ion regulator, surface regulator, complexing agent and water. The micro-emulsion acid unblocking system provided by the invention has the characteristics of low reaction speed, strong corrosion capacity and friendly environment interface, has a good effect of removing inorganic blocking and organic blocking in a stratum, can corrode part of mineral components in a reservoir stratum, increases the pore volume and improves the permeability; and the micro-emulsion acid system has low surface tension, and can relieve water lock damage brought by external liquid to reservoirs and micropores. The main surfactant and the organic solvent used by the micro-emulsified acid blockage removing system provided by the invention are biodegradable and environment-friendly substances, have no pollution to the environment and have wide application prospects.
Description
Technical Field
The invention relates to the technical field of oil reservoir exploitation, in particular to a micro-emulsified acid blockage removing system and a preparation method thereof.
Background
When low-permeability oil gas is hidden in the water injection development process, because the physical property of the stratum is poor, the clay of the reservoir is hydrated and expanded, dirt precipitation is generated by reinjection of sewage and dirt, and the like, the pore passages of the stratum are blocked, the permeability of the oil layer is reduced, the water injection pressure of a water injection well is increased, and the water injection quantity is reduced.
At present, measures such as acidification blockage removal and the like are generally adopted when the oil reservoir with blockage is subjected to pollution removal. The conventional acidification blockage removal method adopts a reagent mainly comprising inorganic acid, and the inorganic acid blockage removal method has the defects of small treatment radius, easy generation of secondary damage and the like, so that the acidification blockage removal effect is greatly influenced; in the process of reservoir transformation, a large amount of external liquid invades a reservoir, so that a water lock effect is easily caused, and severe damage is caused to a hypotonic or ultra-hypotonic reservoir, while the existing inorganic acid blockage removal can only realize blockage removal and cannot reduce the damage of the water lock to the reservoir. In addition, the existing method for removing the blockage by using the inorganic acid only has a good oil reservoir effect on inorganic blockage and does not have a blockage removing effect on oil-soluble organic blocking substances.
The microemulsion is a thermodynamically stable system composed of a surfactant, a cosurfactant, water, a hydrocarbon compound and the like, and at present, the microemulsion system is adopted as a cleanup additive to unblock a blocked oil reservoir in reports. However, the microemulsion system only has the effect of removing oil-soluble organic blocking substances, and has poor effect of removing oil deposits blocked by inorganic substances.
Disclosure of Invention
In view of the above, the invention provides a micro-emulsion acid blockage removing system and a preparation method thereof. The micro-emulsion acid blockage removing system provided by the invention can simultaneously remove inorganic substance blockage and organic substance blockage in the stratum, and has stronger water-lock removing capability.
In order to achieve the above object, the present invention provides the following technical solutions:
a micro-emulsified acid blockage removing system comprises the following preparation raw materials in parts by mass: 8-20% of biodegradable surfactant, 10-18% of organic acid, 4-15% of surfactant assistant, 4-15% of cosolvent, 9-20% of plant-type organic solvent, 0.2-2% of ion regulator, 0.05-2.5% of surface regulator, 0.3-1% of complexing agent and the balance of water; the biodegradable surfactant includes a nonionic surfactant and an anionic surfactant.
Preferably, the nonionic surfactant is alkylphenol ethoxylates; the anionic surfactant is one or more of fatty alcohol-polyoxyethylene ether sulfate, sulfonate and carboxylate.
Preferably, the surface conditioner is a fluorosurfactant.
Preferably, the fluorine-containing surfactant is one or more of 8-carbon perfluorocarbon surfactant, 10-carbon perfluorocarbon surfactant and 12-carbon perfluorocarbon surfactant.
Preferably, the organic acid is one or more of sulfamic acid, citric acid and oxalic acid.
Preferably, the complexing agent is one or more of citric acid, EDTA and ascorbic acid.
Preferably, the plant-type organic solvent comprises one or more of D-limonene oil, terpineol and castor oil;
the surface assistant agent is one or more of betaine zwitterionic surfactant and amine oxide surfactant;
the cosolvent is small molecular organic alcohol;
the ion regulator is a monovalent metal salt.
Preferably, the pH value of the micro-emulsified acid blockage removing system is 2 to 3.
The invention also provides a preparation method of the micro-emulsified acid blockage relieving system, which comprises the following steps:
(1) Mixing an anionic surfactant, water and a cosolvent to obtain a first feed liquid;
(2) Mixing the first feed liquid, organic acid, a nonionic surfactant and an ion regulator, and reacting for 2-4h at 70-75 ℃ to obtain a second feed liquid;
(3) Mixing the second feed liquid, the plant-type organic solvent, the surface modifier and the complexing agent, and reacting for 1 to 2h at the temperature of 60 to 75 ℃ to obtain a third feed liquid;
(4) And mixing the third feed liquid with a surface conditioning agent, and reacting for 1h at 60-65 ℃ to obtain a micro-emulsion acid blockage removing system.
The invention provides a micro-emulsion acid blockage removing system which comprises the following preparation raw materials in parts by mass: 8-20% of cocoa biodegradable surfactant, 10-18% of organic acid, 4-15% of surface modifier, 4-15% of cosolvent, 9-20% of plant-type organic solvent, 0.2-2% of ion regulator, 0.05-2.5% of surface regulator, 0.3-1% of complexing agent and the balance of water; the biodegradable surfactant includes a nonionic surfactant and an anionic surfactant. The micro-emulsion acid unblocking system provided by the invention comprises organic acid and biodegradable surfactant, the organic acid and the biodegradable surfactant can perform nucleophilic addition reaction and oxidation reaction, and generate the zwitterionic polymer surfactant through intermolecular electron cloud rearrangement, and the polymer surfactant has strong water solubility, foaming capacity, salt resistance and temperature resistance, can make the micro-emulsion acid system more stable and has no pollution; and because the organic acid is added, the microemulsion acid system provided by the invention is acidic, has strong corrosion capacity, can remove inorganic substance blockage in the stratum, can partially corrode some mineral components in the reservoir, and has the functions of removing deposition, increasing porosity and improving permeability.
The micro-emulsified acid blockage removing system provided by the invention also comprises a complexing agent, so that the formed micro-emulsified acid system has a complexing function, and metal ions after being dissolved can be masked in a complexing mode to eliminate secondary precipitation, so that the acidification blockage removing effect is greatly enhanced.
The micro-emulsified acid blockage removing system also comprises a plant-type organic solvent, wherein the plant-type organic solvent is a high-efficiency environment-friendly solvent and a nonpolar solvent, and can be combined with a surface polymerization agent through a non-chemical bond to finally form a micro-emulsified acid system with a water-soluble active molecular layer as an external phase and an organic solvent as an internal phase, so that the micro-emulsified acid system is more stable, the micro-emulsified acid system has the capacity of dissolving organic matters, organic matter blockage in pores can be removed in the blockage removing process, and the blockage removing and yield increasing effects on a shale oil-gas well are more effective.
In addition, the microemulsion acid system provided by the invention has a nano-scale particle size and can enter tiny pores and microcracks for action; compared with other acid solution blocking removers, the microemulsion acid system provided by the invention has lower surface tension and interfacial tension and also has a bidirectional wetting function, can penetrate deep into the deep part of a pore through the imbibition capacity in the blocking removal process, reduces or eliminates water lock by reducing the surface tension and changing the rock wettability, reduces the residual water saturation, increases the relative permeability of an oil phase, and achieves the effects of blocking removal and yield increase; more importantly, the micro-emulsified acid blockage removing system can be smoothly drained back after the micro-emulsified acid blockage removing system is used, and secondary precipitation damage cannot be caused.
In addition, the main surfactant and the organic solvent used by the micro-emulsified acid blockage removing system provided by the invention are biodegradable and environment-friendly substances, so that the environment is not polluted, different strata and different use purposes can be met by compounding different types of reagents, and the micro-emulsified acid blockage removing system has wide application prospect.
In conclusion, the microemulsion acid-deblocking system provided by the invention has incomparable advantages in acid-deblocking and yield-increasing transformation of a low-permeability oil-gas reservoir.
The invention also provides a preparation method of the micro-emulsified acid unblocking system in the scheme, the preparation method provided by the invention is simple in step and easy to operate, and the obtained micro-emulsified acid unblocking system has nano-scale emulsion particles, is thermodynamically stable and has good temperature resistance.
The results of the examples show that the microemulsion acid-hydrolysis blocking system provided by the invention is a homogeneous emulsion, the diameter of emulsion particles is less than 50nm, the temperature resistance can reach more than 300 ℃, the microemulsion acid system provided by the invention is prepared into a 0.3% aqueous solution, the surface tension of the obtained aqueous solution can reach 23 to 25mN/m, and the interfacial tension is less than 2mN/m; adding 0.3% of a micro-emulsion acid blockage removal system into fluid of an injection well, so that the permeability of the sandstone stratum can be recovered to 75% -85%; the plugging agent has super-strong water-lock releasing capacity, larger plugging releasing radius, quicker flowback and the flowback rate of a hypotonic reservoir up to more than 80 percent.
Detailed Description
The invention provides a micro-emulsion acid blockage removing system which comprises the following preparation raw materials in parts by mass: 8-20% of cocoa biodegradable surfactant, 10-18% of organic acid, 4-15% of surfactant, 4-15% of cosolvent, 9-20% of plant organic solvent, 0.2-2% of ion regulator, 0.05-2.5% of surface regulator, 0.3-1% of complexing agent and the balance of water.
Unless otherwise specified, the starting materials used in the present invention are commercially available.
The raw materials for preparing the micro-emulsion acid unblocking system comprise, by mass, 8-20% of biodegradable surfactant, and preferably 10-19%. In the present invention, the biodegradable surfactant is preferably a nonionic surfactant and an anionic surfactant; the mass ratio of the anionic surfactant to the nonionic surfactant is preferably 6 to 10, and 23 to 25, more preferably 6; the nonionic surfactant is preferably alkylphenol polyoxyethylene, more preferably nonylphenol polyoxyethylene-9; the anionic surfactant is one or more of fatty alcohol sulfate, fatty alcohol sulfonate and fatty alcohol carboxylate, and is more preferably fatty alcohol polyoxyethylene ether carboxylate (AEC) and alpha-olefin sodium sulfonate (AOS) or fatty acid methyl ester sodium sulfonate (MES); in the embodiment of the present invention, it is preferable to use nonylphenol polyoxyethylene ether-9 in combination with sodium α -olefin sulfonate, or to use nonylphenol polyoxyethylene ether-9 in combination with fatty alcohol polyoxyethylene ether carboxylate.
The preparation raw material of the micro-emulsion acid unblocking system comprises 10-18% of organic acid by mass percentage, and preferably 12-17%. In the present invention, the organic acid is preferably one or more of sulfamic acid, citric acid and oxalic acid.
The preparation raw material of the micro-emulsion acid unblocking system comprises, by mass, 4-15% of a surface modifier, preferably 6-14%. In the invention, the surface assistant agent is preferably one or more of betaine zwitterionic surfactant, alkyl glycoside carboxylate and amine oxide surfactant; the betaine zwitterionic surfactant is preferably octadecyl hydroxyethyl sulfobetaine; the amine oxide-based surfactant is preferably an amine oxide. In the invention, the surface assistant agent can fully dissolve the organic phase and the water phase, so that the organic phase and the water phase are fully contacted to react, and the stability of a micro-emulsion acid system is facilitated.
The raw material for preparing the micro-emulsified acid unblocking system comprises 4-15% of cosolvent by mass percent, and preferably 6-14% of cosolvent by mass percent. In the invention, the cosolvent is preferably a small-molecular organic alcohol, and the carbon atom number of the small-molecular organic alcohol is preferably 2 to 6; specifically, the small-molecular organic alcohol is preferably one or more of ethanol, isopropanol and ethylene glycol butyl ether. The invention takes micromolecule organic alcohol as a cosolvent, can promote the dispersion and dissolution of organic solvent, and improves the intersolubility.
The preparation raw material of the micro-emulsion acid unblocking system comprises 9-20% by mass of a plant-type organic solvent, and preferably 12-18%. In the present invention, the plant-type organic solvent preferably includes one or more of D-limonene oil, terpineol and castor oil; the invention adopts the plant type organic solvent, can realize the dissolution of organic matters in the stratum, and the used solvent is safe and environment-friendly and does not produce environmental pollution.
The raw materials for preparing the micro-emulsion acid unblocking system comprise 0.2 to 2 percent of ion regulator, preferably 0.5 to 1.5 percent of ion regulator. In the present invention, the ion modifier is preferably a monovalent metal salt; the monovalent metal salt is preferably NaCl, KCl, NH 4 Cl and NaNO 3 One or more of the above; the invention improves the stability of the microemulsion acid system by adding the ion regulator to regulate the ion content in the microemulsion acid.
The raw material for preparing the micro-emulsion acid unblocking system comprises 0.05-2.5% of surface conditioning agent by mass fraction, and preferably 0.06-2.0%. In the invention, the surface conditioning agent is preferably a fluorine-containing surfactant, and the fluorine-containing surfactant is preferably one or more of 8-carbon perfluorocarbon surfactant, 10-carbon perfluorocarbon surfactant and 12-carbon perfluorocarbon surfactant; the surface conditioning agent selected by the invention has the characteristics of stable performance, good compatibility, environmental protection and the like, and can be matched with a surfactant in a system to reduce the surface tension of a micro-emulsion acid system.
The preparation raw material of the micro-emulsion acid unblocking system comprises 0.3-1% of complexing agent, preferably 0.4-0.8% by mass. In the invention, the complexing agent is preferably one or more of citric acid, EDTA and ascorbic acid.
The invention also provides a preparation method of the micro-emulsified acid blockage removing system in the scheme, which comprises the following steps:
(1) Mixing an anionic surfactant, water and a cosolvent to obtain a first feed liquid;
(2) Mixing the first feed liquid, organic acid, a nonionic surfactant and an ion regulator, and reacting for 2-4h at 70-75 ℃ to obtain a second feed liquid;
(3) Mixing the second feed liquid, the plant-type organic solvent, the surface modifier and the complexing agent, and reacting for 1 to 2h at the temperature of 60 to 75 ℃ to obtain a third feed liquid;
(4) And mixing the third feed liquid with a surface conditioning agent, and reacting for 1h at 60-65 ℃ to obtain a micro-emulsion acid blockage removing system.
The method mixes the anionic surfactant, water and cosolvent to obtain a first feed liquid. In the present invention, the mixing is carried out at room temperature; the invention has no special requirements on the specific mixing mode, and the raw materials can be uniformly mixed by adopting a mode known by the technical personnel in the field, such as stirring.
After the first feed liquid is obtained, the first feed liquid, the organic acid, the nonionic surfactant and the ionic regulator are mixed and react for 2 to 4 hours at the temperature of 70 to 75 ℃, preferably for 2.5 to 3.5 hours at the temperature of 72 to 73 ℃ to obtain a second feed liquid. The first material liquid is preferably heated to 60 to 65 ℃, then an ion regulator is added into the first material liquid to be uniformly mixed, then the first material liquid is heated to 70 to 75 ℃, organic acid and a nonionic surfactant are added, the mixture is stirred until the organic acid and the nonionic surfactant are dissolved and uniformly mixed, and then the heating temperature is kept for reaction. In the reaction process, the organic acid and the surfactant undergo nucleophilic addition reaction and coupling reaction, and then the polyether surfactant is generated.
After a second feed liquid is obtained, the second feed liquid, the plant-type organic solvent, the surface modifier and the complexing agent are mixed and react for 1 to 2h at the temperature of 60 to 75 ℃, preferably for 1.3 to 1.5h at the temperature of 65 to 70 ℃ to obtain a third feed liquid. In the invention, the heating temperature of the second feed liquid is preferably kept at 60-75 ℃, and then the plant-type organic solvent, the surface assistant agent and the complexing agent are added into the second feed liquid and react under the stirring condition; in the present invention, the reactions occurring here are emulsification reactions and complexation reactions.
After the third feed liquid is obtained, the third feed liquid and a surface conditioning agent are mixed, and the mixture reacts for 1 hour at the temperature of 60 to 65 ℃ to obtain a micro-emulsified acid blockage removing system. In the specific embodiment of the invention, the heating temperature of the third material liquid is preferably kept at 60 to 65 ℃, and then the surface conditioning agent is added to react under the stirring condition; the reaction occurring here is an emulsion reaction; after the reaction is finished, a brown uniform liquid is obtained, namely the micro-emulsion acid system.
The microemulsion acid system obtained by the method is uniform and transparent brown liquid, does not delaminate after being placed for a long time, and the particle size of emulsion liquid drops is less than 50nm.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.
Example 1
Adding 80mL of water into a beaker, putting into a water bath, adding the biodegradable surfactant and the cosolvent into a container, and uniformly stirring to obtain a first feed liquid. Wherein the added biodegradable surfactant is AOS (alpha-olefin sodium sulfonate), and the addition amount is 6g; the cosolvent is 9.6g of isopropyl alcohol and ethylene glycol butyl ether, and the mass ratio of the isopropyl alcohol to the ethylene glycol butyl ether is 1;
heating the first feed liquid to 65 ℃, adding an ion regulator, and stirring to dissolve the first feed liquid into uniform liquid. Wherein the ion regulator is sodium chloride, and the addition amount is 0.4g;
heating the obtained liquid to 75 ℃, and adding 25g of nonionic surfactant and 25g of organic acid; the nonionic surfactant is nonylphenol polyoxyethylene ether-9; the added organic acid is citric acid and sulfamic acid, wherein the mass ratio of the sulfamic acid to the citric acid is 1:1.5. and reacting the liquid at 75 ℃ for 2h to obtain a second feed liquid.
Adjusting the temperature of the second feed liquid to 65 ℃, and adding a plant type organic solvent, a surface assistant agent and a complexing agent, wherein the plant type organic solvent is terpineol, and the adding amount is 17g; the surface assistant agent is alkyl polyglycoside carboxylate, the adding amount is 7g, the complexing agent is EDTA, the adding amount is 0.9g, and the third material liquid is obtained after stirring for 1 h.
And continuously heating the obtained third feed liquid to maintain the temperature at 65 ℃, adding a surface regulator, wherein the surface regulator is a 10-carbon perfluorocarbon surfactant, the adding amount is 4g, stirring for 1h to obtain brown uniform liquid, namely a micro-emulsion acid blockage removing system, the pH value of the system is 3, and the diameter of emulsion particles is less than 50nm.
The obtained micro-emulsified acid blockage removing system is prepared into 0.3wt% of aqueous solution, the surface tension of the aqueous solution is 24.54mN/m, the interfacial tension is 0.85 mN/m, and the wetting angle is 28.4 degrees. The obtained microemulsion acid system is placed at 300 ℃ for 4h, and the particle size, the surface tension, the interfacial tension and the wetting angle of the system are not obviously changed. And the water-lock releasing capacity is strong, the flowback rate can reach more than 80%, and the recovery value of the permeability is more than 2.
The microemulsion acid plugging removal system prepared in the embodiment 1 is used in a low-permeability reservoir water injection well, wherein inorganic plugging and organic plugging exist in the low-permeability reservoir water injection well at the same time, 0.3% of microemulsion acid plugging removal system is added into fluid of an injection well, the water injection pressure is reduced from 14MPa to 12MPa, and the plugging removal effect is obvious.
Example 2
Adding 75mL of water into a beaker, putting into a water bath, adding the biodegradable surfactant and the cosolvent into the beaker, and uniformly stirring to obtain a first feed liquid. Wherein, the added biodegradable surfactant is AEC (fatty alcohol polyoxyethylene ether carboxylate), and the addition amount is 10g; the cosolvent is isopropanol and ethylene glycol butyl ether, the addition amount is 8g, and the mass ratio of the isopropanol to the ethylene glycol butyl ether is 1;
heating the first material liquid to 60-65 ℃, adding an ion regulator, and stirring and dissolving to obtain uniform liquid. Wherein the ion regulator is sodium chloride, and the addition amount is 2g;
the liquid obtained above was heated to 70 ℃ and 23g of nonionic surfactant and 18g of organic acid were added. The added nonionic surfactant is nonylphenol polyoxyethylene ether-10; the organic acid added is citric acid. And reacting the liquid at 70 ℃ for 3h to obtain a second feed liquid.
Adjusting the temperature of the second feed liquid to 60 ℃, and adding a plant type organic solvent, a surface assistant agent and a complexing agent, wherein the plant type organic solvent is D-limonene oil, and the adding amount is 17g; the surface assistant agent is 21g of octadecyl hydroxyethyl sulfobetaine and amine oxide, the proportion of the octadecyl hydroxyethyl sulfobetaine to the amine oxide is 2:1, the complexing agent is citric acid, and the addition amount is 0.8g. Stirring for 1h to obtain a third feed liquid.
Continuously heating the third feed liquid, keeping the temperature at 60 ℃, adding a surface regulator, wherein the surface regulator is 8-carbon perfluorocarbon surfactant and 10-carbon perfluorocarbon surfactant, and the ratio of the two is 1:3, stirring for 1h to obtain brown uniform liquid, namely a micro-emulsion acid blockage removal system, wherein the pH value of the system is 3, and the diameter of emulsion particles is less than 9-14nm.
The obtained micro-emulsion acid is prepared into 0.3 weight percent aqueous solution, the surface tension of the aqueous solution is 23.24mN/m, the interfacial tension is 0.34 mN/m, and the wetting angle is 19.3 degrees. The obtained microemulsion acid system is placed at 300 ℃ for 4h, and the particle size, the surface tension, the interfacial tension and the wetting angle of the system are not obviously changed. And the water-lock releasing capacity is strong, the flowback rate can reach more than 78%, and the recovery value of the permeability is more than 2.
The microemulsion acid plugging removal system prepared in the embodiment 2 is used in a low-permeability reservoir water injection well, wherein inorganic plugging and organic plugging exist in the low-permeability reservoir water injection well at the same time, 0.3% of microemulsion acid plugging removal system is added into fluid of an injection well, the water injection pressure is reduced to 11.9MPa from 14MPa, and the plugging removal effect is obvious.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A micro-emulsified acid blockage removing system is characterized by being prepared from the following preparation raw materials in parts by mass: 8-20% of biodegradable surfactant, 10-18% of organic acid, 4-15% of surfactant assistant, 4-15% of cosolvent, 9-20% of plant-type organic solvent, 0.2-2% of ion regulator, 0.05-2.5% of surface regulator, 0.3-1% of complexing agent and the balance of water; the biodegradable surfactant comprises a nonionic surfactant and an anionic surfactant; the organic acid is one or more of sulfamic acid, citric acid and oxalic acid; the complexing agent is one or more of citric acid, EDTA and ascorbic acid; the nonionic surfactant is alkylphenol polyoxyethylene; the anionic surfactant is alpha-olefin sodium sulfonate or fatty alcohol-polyoxyethylene ether carboxylate; the surface conditioning agent is a fluorine-containing surfactant; the fluorine-containing surfactant is one or more of 8-carbon perfluorocarbon surfactant, 10-carbon perfluorocarbon surfactant and 12-carbon perfluorocarbon surfactant; the surface assistant agent is alkyl glycoside carboxylate, or the surface assistant agent is one or more of betaine zwitterionic surfactant and amine oxide surfactant; the cosolvent is micromolecular organic alcohol; the ion regulator is monovalent metal salt;
the preparation method of the micro-emulsified acid blockage removing system comprises the following steps:
(1) Mixing an anionic surfactant, water and a cosolvent to obtain a first feed liquid;
(2) Mixing the first feed liquid, organic acid, a non-ionic surfactant and an ionic regulator, and reacting at 70 to 75 ℃ for 2 to 4 hours to obtain a second feed liquid;
(3) Mixing the second feed liquid, the plant-type organic solvent, the surface modifier and the complexing agent, and reacting for 1 to 2h at the temperature of 60 to 75 ℃ to obtain a third feed liquid;
(4) And mixing the third feed liquid with a surface conditioning agent, and reacting for 1h at 60-65 ℃ to obtain a micro-emulsion acid blockage removing system.
2. A micro-emulsified acid unblocking system according to claim 1, wherein the plant-type organic solvent includes one or more of D-limonene oil, terpineol and castor oil.
3. A micro-emulsified acid unblocking system according to claim 1, wherein the pH value of the micro-emulsified acid unblocking system is 2 to 3.
4. The preparation method of the micro-emulsion acid blockage removal system according to any one of claims 1 to 3, which is characterized by comprising the following steps:
(1) Mixing an anionic surfactant, water and a cosolvent to obtain a first feed liquid;
(2) Mixing the first feed liquid, organic acid, a nonionic surfactant and an ion regulator, and reacting for 2-4h at 70-75 ℃ to obtain a second feed liquid;
(3) Mixing the second feed liquid, the plant-type organic solvent, the surface modifier and the complexing agent, and reacting for 1 to 2h at the temperature of 60 to 75 ℃ to obtain a third feed liquid;
(4) And mixing the third feed liquid with a surface conditioning agent, and reacting for 1h at 60-65 ℃ to obtain a micro-emulsion acid blockage removing system.
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| US6593279B2 (en) * | 1999-12-10 | 2003-07-15 | Integrity Industries, Inc. | Acid based micro-emulsions |
| CN101691839B (en) * | 2009-09-30 | 2013-06-26 | 陕西中孚石油技术有限责任公司 | Ultra-low resistance acid-type microemulsion plugging removal and stimulation technology for low permeability oil well |
| CN101691838B (en) * | 2009-10-14 | 2014-02-26 | 西安中孚凯宏石油科技有限责任公司 | Ultralow permeability oil filed water injection well multicomponent chemical microemulsion pressure reduction and injection gain method |
| CN102127414B (en) * | 2010-12-28 | 2013-03-06 | 中国石油大学(华东) | Microemulsion-type fracture acidizing cleanup additive, and preparation method and application thereof |
| US9670399B2 (en) * | 2013-03-15 | 2017-06-06 | Halliburton Energy Services, Inc. | Methods for acidizing a subterranean formation using a stabilized microemulsion carrier fluid |
| CN104789205A (en) * | 2014-01-20 | 2015-07-22 | 中国石油天然气股份有限公司 | Nanometer microemulsion cleanup additive |
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| US11473004B2 (en) * | 2016-12-02 | 2022-10-18 | University Of Wyoming | Microemulsions and uses thereof to displace oil in heterogeneous porous media |
| CN108570317B (en) * | 2017-03-13 | 2022-02-22 | 中国石油化工股份有限公司 | Microemulsion for relieving water lock injury of low-permeability reservoir |
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| CN114316935A (en) | 2022-04-12 |
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