CN112342003B - Preparation method of viscoelastic surfactant for improving recovery ratio - Google Patents
Preparation method of viscoelastic surfactant for improving recovery ratio Download PDFInfo
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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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Abstract
The invention discloses a preparation method of a viscoelastic surfactant for improving recovery efficiency, which is prepared from the following raw materials: 20% -30% of betaine, 2% -5% of sodium chloride, 3% -5% of an acidifying agent, 1% -3% of nano-silica sol and 40% -70% of water, the viscoelastic surfactant for improving the recovery ratio provided by the invention does not adopt a high molecular polymer for generation, can effectively reduce the complexity of the process flow and is beneficial to generation control, the acidifying agent is used for treatment, the concentration of the acid liquor is reduced along with the reaction of the acid liquor and an oil layer, the viscosity can be obviously increased to more than 1000mPa & s, the nano-silica micelle has the shear thickening property, the tension of the interface of the crude oil and water can be effectively reduced, the recovery ratio is effectively improved, the flash point is higher than 60 ℃, the components are relatively stable, the generation is convenient to control, and the viscoelastic surfactant is beneficial to processing and using.
Description
Technical Field
The invention relates to the technical field of oil displacement agents, in particular to a preparation method of a viscoelastic surfactant for improving the recovery ratio.
Background
With the oxford fabric at the end of the exploration technology, the number of deep wells and high-pressure wells of each large oil field is increased, and for deep reservoirs, viscoelastic movable oil displacement agents are required to be used due to high pressure.
However, most of the existing oil displacement agents are prepared by using high molecular polymers, so that the process flow is complex, the control is not facilitated, the product characteristics are single, the shear thickening effect is not achieved, the effect of reducing the interfacial tension of the crude oil and water is not obvious, the generation and the use are not facilitated, and a new component and a new mode are to be provided.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a preparation method of a viscoelastic surfactant for improving the recovery efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a viscoelastic surfactant for improving the recovery ratio comprises the following steps: 20-30% of betaine, 2-5% of sodium chloride, 3-5% of an acidifier, 1-3% of nano-silica sol and 40-70% of water.
Preferably, the preparation method comprises the following steps:
s1, weighing the components according to the mass percentage for later use;
s2, inputting betaine and sodium chloride into a container, adding water, stirring for accelerating dissolution, then adding the silica sol, and uniformly stirring until the appearance is light yellow, semitransparent or milky paste;
s3, adding an acidifier, uniformly stirring, and adjusting the pH to 6-8 to obtain the active agent.
Preferably, the betaine comprises 25% -35% of chloroacetic acid, 15% -20% of sodium carbonate, 15% -20% of trimethylamine and 40% -60% of water.
Preferably, the preparation method of the betaine comprises the following steps:
p1, weighing the components according to the mass percentage for later use;
p2, adding water into a reaction kettle, then adding chloroacetic acid into the reaction kettle, stirring until the chloroacetic acid is completely dissolved, then adding sodium carbonate, controlling the adding rate, reducing the carbon dioxide precipitation rate, and carrying out reaction;
p3, monitoring the change of water temperature, adding water for the second time when the temperature is higher than 50-55 ℃, controlling the temperature to be 40-55 ℃, and stabilizing for 1-2 hours after the sodium carbonate is added;
p4, continuing to put trimethylamine, adding water again, controlling the reaction temperature to be 50-55 ℃, and stabilizing for thirty-to fifty-minutes after the trimethylamine is put; obtaining a product solution;
p5, easily heating the product to concentrate, wherein the heating temperature is 90-95 ℃ until the concentration is 75-80%, and obtaining the product concentrate;
and P6, performing rotary evaporation on the product concentrate to remove water, then performing recrystallization by using absolute ethyl alcohol to remove insoluble substances, and obtaining a solid product, namely a betaine finished product.
Preferably, the step P6 further includes drying the solid product at a temperature of 60 to 65 ℃.
Preferably, the acidifier comprises 10-15% of hydrochloric acid, 3-5% of fluoric acid, 1-3% of glycol, 6-10% of isooctyl acrylate and 50-70% of water.
Preferably, the preparation method of the acidifying agent comprises the following steps:
q1, mixing ethylene glycol and isooctyl acrylate, and uniformly stirring to obtain a mixed solution;
q2, adding hydrochloric acid and hydrofluoric acid into the mixed solution, and uniformly stirring and mixing to obtain an acid solution;
q3, adding water into the acid solution, and adjusting the content of acidic ions to 6-8% to obtain the acidulant.
Preferably, the hydrochloric acid and the fluoric acid are both aqueous solutions with the mass percentage of 25% -30%.
The viscoelastic surfactant for improving the recovery ratio is prepared without adopting a high polymer, can effectively reduce the complexity of the process flow and is beneficial to generation control, the acidifying agent is used for treating, the concentration of the acid liquid is reduced along with the reaction of the acid liquid and an oil layer, the viscosity can be obviously increased to more than 1000mPa & s, the nano silica micelle has shear thickening performance, can effectively reduce the tension of an original oil-water interface and effectively improve the recovery ratio, has a flash point higher than 60 ℃, is stable in component, is convenient to control and generate, and is beneficial to processing and use.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A preparation method of a viscoelastic surfactant for improving the recovery ratio comprises the following steps: 20-30% of betaine, 2-5% of sodium chloride, 3-5% of an acidifier, 1-3% of nano-silica sol and 40-70% of water.
Preferably, the preparation method comprises the following steps:
s1, weighing the components according to the mass percentage for later use;
s2, inputting betaine and sodium chloride into a container, adding water, stirring for accelerating dissolution, then adding the silica sol, and uniformly stirring until the appearance is light yellow, semitransparent or milky paste;
s3, adding an acidifier, uniformly stirring, and adjusting the pH to 6-8 to obtain the active agent.
Preferably, the betaine comprises 25% -35% of chloroacetic acid, 15% -20% of sodium carbonate, 15% -20% of trimethylamine and 40% -60% of water.
Preferably, the preparation method of the betaine comprises the following steps:
p1, weighing the components according to the mass percentage for later use;
p2, adding water into a reaction kettle, then adding chloroacetic acid into the reaction kettle, stirring until the chloroacetic acid is completely dissolved, then adding sodium carbonate, controlling the adding rate, reducing the carbon dioxide precipitation rate, and carrying out reaction;
p3, monitoring the change of water temperature, adding water for the second time when the temperature is higher than 50-55 ℃, controlling the temperature to be 40-55 ℃, and stabilizing for 1-2 hours after the sodium carbonate is added;
p4, continuing to put trimethylamine, adding water again, controlling the reaction temperature to be 50-55 ℃, and stabilizing for thirty-to fifty-minutes after the trimethylamine is put; obtaining a product solution;
p5, easily heating the product to concentrate, wherein the heating temperature is 90-95 ℃ until the concentration is 75-80%, and obtaining the product concentrate;
and P6, performing rotary evaporation on the product concentrate to remove water, then performing recrystallization by using absolute ethyl alcohol to remove insoluble substances, and obtaining a solid product, namely a betaine finished product.
Preferably, the step P6 further includes drying the solid product at a temperature of 60 to 65 ℃.
Preferably, the acidifier comprises 10-15% of hydrochloric acid, 3-5% of fluoric acid, 1-3% of glycol, 6-10% of isooctyl acrylate and 50-70% of water.
Preferably, the preparation method of the acidifying agent comprises the following steps:
q1, mixing ethylene glycol and isooctyl acrylate, and uniformly stirring to obtain a mixed solution;
q2, adding hydrochloric acid and hydrofluoric acid into the mixed solution, and uniformly stirring and mixing to obtain an acid solution;
q3, adding water into the acid solution, and adjusting the content of acidic ions to 6-8% to obtain the acidulant.
Preferably, the hydrochloric acid and the fluoric acid are both aqueous solutions with the mass percentage of 25% -30%.
The viscoelastic surfactant for improving the recovery ratio is prepared without adopting a high polymer, can effectively reduce the complexity of the process flow and is beneficial to generation control, the acidifying agent is used for treating, the concentration of the acid liquid is reduced along with the reaction of the acid liquid and an oil layer, the viscosity can be obviously increased to more than 1000mPa & s, the nano silica micelle has shear thickening performance, can effectively reduce the tension of an original oil-water interface and effectively improve the recovery ratio, has a flash point higher than 60 ℃, is stable in component, is convenient to control and generate, and is beneficial to processing and use.
Example 1
A preparation method of a viscoelastic surfactant for improving the recovery ratio comprises the following steps: 20-30% of betaine, 2-5% of sodium chloride, 3-5% of an acidifier, 1-3% of nano-silica sol and 40-70% of water.
Preferably, the preparation method comprises the following steps:
s1, weighing the components according to the mass percentage for later use;
s2, inputting betaine and sodium chloride into a container, adding water, stirring for accelerating dissolution, then adding the silica sol, and uniformly stirring until the appearance is light yellow, semitransparent or milky paste;
s3, adding an acidifier, uniformly stirring, and adjusting the pH to 6-8 to obtain the active agent.
Preferably, the betaine comprises 25% -35% of chloroacetic acid, 15% -20% of sodium carbonate, 15% -20% of trimethylamine and 40% -60% of water.
Preferably, the preparation method of the betaine comprises the following steps:
p1, weighing the components according to the mass percentage for later use;
p2, adding water into a reaction kettle, then adding chloroacetic acid into the reaction kettle, stirring until the chloroacetic acid is completely dissolved, then adding sodium carbonate, controlling the adding rate, reducing the carbon dioxide precipitation rate, and carrying out reaction;
p3, monitoring the change of water temperature, adding water for the second time when the temperature is higher than 50-55 ℃, controlling the temperature to be 40-55 ℃, and stabilizing for 1-2 hours after the sodium carbonate is added;
p4, continuing to put trimethylamine, adding water again, controlling the reaction temperature to be 50-55 ℃, and stabilizing for thirty-to fifty-minutes after the trimethylamine is put; obtaining a product solution;
p5, easily heating the product to concentrate, wherein the heating temperature is 90-95 ℃ until the concentration is 75-80%, and obtaining the product concentrate;
and P6, performing rotary evaporation on the product concentrate to remove water, then performing recrystallization by using absolute ethyl alcohol to remove insoluble substances, and obtaining a solid product, namely a betaine finished product.
Preferably, the step P6 further includes drying the solid product at a temperature of 60 to 65 ℃.
Preferably, the acidifying agent comprises 15% hydrochloric acid, 3% fluoric acid, 2% ethylene glycol, 10% isooctyl acrylate and 70% water.
Preferably, the preparation method of the acidifying agent comprises the following steps:
q1, mixing ethylene glycol and isooctyl acrylate, and uniformly stirring to obtain a mixed solution;
q2, adding hydrochloric acid and hydrofluoric acid into the mixed solution, and uniformly stirring and mixing to obtain an acid solution;
q3, adding water into the acid solution, and adjusting the content of acidic ions to 12% to obtain the acidulant.
Preferably, the hydrochloric acid and the fluoric acid are both aqueous solutions with the mass percentage of 30%.
Example 2
A preparation method of a viscoelastic surfactant for improving the recovery ratio comprises the following steps: 25% of betaine, 2% of sodium chloride, 3% of an acidifying agent, 2% of nano-silica sol and 68% of water.
Preferably, the preparation method comprises the following steps:
s1, weighing the components according to the mass percentage for later use;
s2, inputting betaine and sodium chloride into a container, adding water, stirring for accelerating dissolution, then adding the silica sol, and uniformly stirring until the appearance is light yellow, semitransparent or milky paste;
s3, adding an acidifier, uniformly stirring, and adjusting the pH to 6-8 to obtain the active agent.
Preferably, the betaine comprises 25% chloroacetic acid, 15% sodium carbonate, 15% trimethylamine and 45% water.
Preferably, the preparation method of the betaine comprises the following steps:
p1, weighing the components according to the mass percentage for later use;
p2, adding water into a reaction kettle, then adding chloroacetic acid into the reaction kettle, stirring until the chloroacetic acid is completely dissolved, then adding sodium carbonate, controlling the adding rate, reducing the carbon dioxide precipitation rate, and carrying out reaction;
p3, monitoring the change of water temperature, adding water for the second time when the temperature is higher than 50-55 ℃, controlling the temperature to be 40-55 ℃, and stabilizing for 1-2 hours after the sodium carbonate is added;
p4, continuing to put trimethylamine, adding water again, controlling the reaction temperature to be 50-55 ℃, and stabilizing for thirty-to fifty-minutes after the trimethylamine is put; obtaining a product solution;
p5, easily heating the product to concentrate, wherein the heating temperature is 90-95 ℃ until the concentration is 75-80%, and obtaining the product concentrate;
and P6, performing rotary evaporation on the product concentrate to remove water, then performing recrystallization by using absolute ethyl alcohol to remove insoluble substances, and obtaining a solid product, namely a betaine finished product.
Preferably, the step P6 further includes drying the solid product at a temperature of 60 to 65 ℃.
Preferably, the acidifying agent comprises 15% hydrochloric acid, 5% fluoric acid, 2% ethylene glycol, 8% isooctyl acrylate, and 60% water.
Preferably, the preparation method of the acidifying agent comprises the following steps:
q1, mixing ethylene glycol and isooctyl acrylate, and uniformly stirring to obtain a mixed solution;
q2, adding hydrochloric acid and hydrofluoric acid into the mixed solution, and uniformly stirring and mixing to obtain an acid solution;
q3, adding water into the acid solution, and adjusting the content of acidic ions to 6% to obtain the acidulant.
Preferably, the hydrochloric acid and the fluoric acid are both aqueous solutions with the mass percentage of 30%.
Example 3
A preparation method of a viscoelastic surfactant for improving the recovery ratio comprises the following steps: 25% of betaine, 4% of sodium chloride, 4% of an acidifying agent, 3% of nano-silica sol and 64% of water.
Preferably, the preparation method comprises the following steps:
s1, weighing the components according to the mass percentage for later use;
s2, inputting betaine and sodium chloride into a container, adding water, stirring for accelerating dissolution, then adding the silica sol, and uniformly stirring until the appearance is light yellow, semitransparent or milky paste;
s3, adding an acidifier, uniformly stirring, and adjusting the pH to 6-8 to obtain the active agent.
Preferably, the betaine comprises 25% chloroacetic acid, 17% sodium carbonate, 18% trimethylamine and 40% water.
Preferably, the preparation method of the betaine comprises the following steps:
p1, weighing the components according to the mass percentage for later use;
p2, adding water into a reaction kettle, then adding chloroacetic acid into the reaction kettle, stirring until the chloroacetic acid is completely dissolved, then adding sodium carbonate, controlling the adding rate, reducing the carbon dioxide precipitation rate, and carrying out reaction;
p3, monitoring the change of water temperature, adding water for the second time when the temperature is higher than 50-55 ℃, controlling the temperature to be 40-55 ℃, and stabilizing for 1-2 hours after the sodium carbonate is added;
p4, continuing to put trimethylamine, adding water again, controlling the reaction temperature to be 50-55 ℃, and stabilizing for thirty-to fifty-minutes after the trimethylamine is put; obtaining a product solution;
p5, easily heating the product to concentrate, wherein the heating temperature is 90-95 ℃ until the concentration is 75-80%, and obtaining the product concentrate;
and P6, performing rotary evaporation on the product concentrate to remove water, then performing recrystallization by using absolute ethyl alcohol to remove insoluble substances, and obtaining a solid product, namely a betaine finished product.
Preferably, the step P6 further includes drying the solid product at a temperature of 60 to 65 ℃.
Preferably, the acidifying agent comprises 13% hydrochloric acid, 4% fluoric acid, 3% ethylene glycol, 10% isooctyl acrylate and 70% water.
Preferably, the preparation method of the acidifying agent comprises the following steps:
q1, mixing ethylene glycol and isooctyl acrylate, and uniformly stirring to obtain a mixed solution;
q2, adding hydrochloric acid and hydrofluoric acid into the mixed solution, and uniformly stirring and mixing to obtain an acid solution;
q3, adding water into the acid solution, and adjusting the content of acidic ions to 10% to obtain the acidulant.
Preferably, the hydrochloric acid and the fluoric acid are both 25% aqueous solutions in percentage by mass.
Claims (1)
1. A preparation method of viscoelastic surfactant for improving recovery efficiency is characterized by comprising the following steps: the viscoelastic surfactant for improving the recovery ratio is prepared from the following raw materials: 20% -30% of betaine, 2% -5% of sodium chloride, 3% -5% of an acidifier, 1% -3% of nano-silica sol and 40% -70% of water; the preparation method comprises the following steps:
s1, weighing the components according to the mass percentage for later use;
s2, inputting betaine and sodium chloride into a container, adding water, stirring for accelerating dissolution, then adding nano silica sol, and uniformly stirring until the appearance is light yellow, semitransparent to milky paste;
s3, adding an acidifying agent, uniformly stirring, and adjusting the pH to 6-8 to obtain an active agent; the betaine comprises 25-35% of chloroacetic acid, 15-20% of sodium carbonate, 15-20% of trimethylamine and 40-60% of water; the preparation method of the betaine comprises the following steps:
p1, weighing the components according to the mass percentage for later use;
p2, adding water into a reaction kettle, then adding chloroacetic acid into the reaction kettle, stirring until the chloroacetic acid is completely dissolved, then adding sodium carbonate, controlling the adding rate, reducing the carbon dioxide precipitation rate, and carrying out reaction;
p3, monitoring the change of water temperature, adding water for the second time when the temperature is higher than 50-55 ℃, controlling the temperature to be 40-55 ℃, and stabilizing for 1-2 hours after the sodium carbonate is added;
p4, continuing to put trimethylamine, adding water again, controlling the reaction temperature to be 50-55 ℃, and stabilizing for thirty-to fifty-minutes after the trimethylamine is put; obtaining a product solution;
p5, easily heating the product to concentrate, wherein the heating temperature is 90-95 ℃ until the concentration is 75-80%, and obtaining the product concentrate;
p6, performing rotary evaporation on the product concentrate to remove water, then performing recrystallization by using absolute ethyl alcohol to remove insoluble substances, and obtaining a solid product, namely a betaine finished product; the step P6 further comprises the step of drying the solid product, wherein the drying temperature is 60-65 ℃; the acidifier comprises 10-15% of hydrochloric acid, 3-5% of fluoric acid, 1-3% of glycol, 6-10% of isooctyl acrylate and 50-70% of water; the preparation method of the acidifier comprises the following steps:
q1, mixing ethylene glycol and isooctyl acrylate, and uniformly stirring to obtain a mixed solution;
q2, adding hydrochloric acid and hydrofluoric acid into the mixed solution, and uniformly stirring and mixing to obtain an acid solution;
q3, adding water into the acid solution, and adjusting the content of acidic ions to 6-8% to obtain an acidifier; the hydrochloric acid and the fluoric acid are both aqueous solutions with the mass percentage of 25-30%.
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