CN109321225B - CO suitable for high-temperature high-salinity oil reservoir2Foaming agent system and preparation method thereof - Google Patents
CO suitable for high-temperature high-salinity oil reservoir2Foaming agent system and preparation method thereof Download PDFInfo
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Abstract
The invention discloses CO suitable for a high-temperature high-salinity reservoir2Foamer system and method for preparing the same, the CO2The foaming agent system comprises 0.01-0.30 wt% of gemini surfactant and 0.10-0.50 wt% of hydrophobic modified nano SiO299.89-99.20 wt% of mineralized water; the preparation method comprises the steps of adding the Gemini surfactant with the formula amount into the mineralized water with the formula amount, stirring for 50-150 minutes, uniformly mixing, and adding the hydrophobically modified nano SiO with the formula amount2Stirring for 10-60 minutes, and uniformly mixing to obtain the CO suitable for the high-temperature high-salinity oil reservoir2A foamer system. The system can effectively reduce the gas-oil fluidity ratio and avoid CO2Gas channeling and viscous fingering phenomena existing in the foam flooding process improve CO2The foam flooding efficiency overcomes the CO2The problem of gas channeling prevention and treatment in the foam flooding technology.
Description
Technical Field
The invention relates to the technical field of tertiary oil recovery, in particular to CO suitable for a high-temperature high-salinity reservoir2A foaming agent system and a preparation method thereof.
Background
As the development of oil fields enters the middle and later stages, the total recovery ratio of primary oil recovery and secondary oil recovery can only reach 30% -40%, so most of crude oil still stays in the stratum, and the tertiary oil recovery technology effectively improves the recovery ratio of crude oil in an oil reservoir because the oil reservoir is very complex and has heterogeneity, oil-gas-water seepage is complex, sweep efficiency and oil washing are both limited.
The tertiary oil recovery technology comprises the following steps: the polymer flooding agent can improve the viscosity of injected water, reduce the viscosity difference of oil and water and improve the spread volume of the injected water; the surfactant flooding can reduce the interfacial tension and improve the flooding efficiency of injected water; and alkali flooding, miscible phase flooding, composite flooding and the like. The polymer has poor adaptability to high-temperature (>75 ℃) and high-salinity oil reservoirs (>10000mg/L), and has poor applicability to low-permeability oil reservoirs.
Foamed fluids have been widely used in the fields of oil reservoir foam plugging of high permeable zones or large pore canals, prevention of gas blow-by, drainage and gas production of water-containing gas wells, drilling, fracturing, sand flushing and well flushing, and the like. The foam flooding agent can selectively block a high-permeability stratum and a water-containing stratum in the stratum, defoam in oil and control the fluidity ratio with good effect, and a foaming agent in the foam fluid is a surfactant, so that the oil washing efficiency can be improved to a certain extent, the surface wettability of the stratum can be changed, the effect of reducing capillary tube force can be realized, and the crude oil recovery rate can be effectively improved.
CO2The flooding can greatly improve the recovery ratio of crude oil by mechanisms of reducing the viscosity of the crude oil, improving the formation energy, reducing the tension of an oil-water interface, realizing the miscible phase with the crude oil and the like, and becomes one of the most promising methods for improving the recovery ratio. However, since gas mobility is higher than water-oil mobility, CO2The phenomenon of gas channeling and viscous fingering which are difficult to avoid affects on CO2Driving the effect of increasing the recovery ratio, and CO being suitable2The foam anti-channeling system can effectively prevent channeling, remarkably improve the condition and improve the oil displacement efficiency. In addition, foam is a thermodynamically unstable gas-liquid dispersion, and a foaming agent needs to be added to improve foaming properties and foam stability of the foam.
However, in practical formations, the higher temperature and the presence of mineralization place the higher requirement for the selection of the foaming agent, and CO2Has strong diffusibility, and can be dissolved in waterThe foam fluid is acidic, can meet the requirements of the stratum, and can form temperature-resistant and good-stability foam fluid in the conditions of high temperature, mineralization and acidity of the stratum to effectively plug the stratum. Previous studies have used anionic surfactants, high molecular weight polymers, etc. to increase foam stability, but for high temperature, highly mineralized, acidic CO2The foam flooding condition has limited adaptability, so that a CO which is efficient, stable, temperature-resistant and salt-tolerant is developed2The foam flooding system has important significance for tertiary recovery of crude oil.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides CO suitable for high-temperature and high-salinity oil reservoirs2A foaming agent system and a preparation method thereof.
The invention aims to reduce the gas-oil fluidity ratio and avoid CO2Gas channeling and viscous fingering phenomena existing in the foam flooding process improve CO2Foam flooding efficiency; the second purpose is to provide CO with better stability at high temperature2Foamer system promoting CO2And (5) carrying out oil displacement project work of the foam.
The technical scheme adopted by the invention is as follows:
CO suitable for high-temperature high-salinity oil reservoir2The foaming agent system is prepared by mixing the following components in percentage by weight:
gemini surfactants: 0.01-0.30 wt%;
hydrophobic modified nano SiO2：0.10％～0.50wt％；
Mineralization of water: 99.89-99.20 wt%;
the Gemini surfactant is prepared from a yellow crystal A and a white solid B in a mass ratio of (4-10): 1, is prepared according to the proportion of 1.
The gemini surfactant is
The yellow crystal A is prepared from dodecyl alcohol polyoxyethylene ether, chloroform and thionyl chloride according to the mass ratio of (1-5): (1-5): 1 in proportion.
The white solid B is prepared from ethylenediamine, potassium carbonate, a solvent and 2-bromoethyl sodium sulfonate according to a mass ratio of 1: (1-5): (50-55) and (5-10).
The molecular weight of the lauryl alcohol polyoxyethylene ether is 318.56-537.92.
The hydrophobic modified nano SiO2The particle size of the modified graphene is 10-100 nm, and the modification degree range is as follows: 30.2 to 76.4 percent.
The degree of mineralization of the mineralized water is 10000-80000 mg/L.
CO suitable for high-temperature high-salinity oil reservoir2A method of preparing a foamable system comprising the steps of:
s1, synthesis of gemini surfactant
Taking the yellow crystal A and the potassium carbonate in a formula amount, placing the yellow crystal A and the potassium carbonate in a flask or a beaker, and mixing the yellow crystal A and the potassium carbonate in a volume ratio of (1-3): 1, stirring and dissolving, heating to 50-100 ℃, and slowly dropwise adding a mixed solution of 30mL (1-3): 1, stirring and reacting at 50-100 ℃ for 8-15 hours after dropwise adding the white solid B dissolved in the acetone-water mixed solution, removing the solvent by reduced pressure distillation after the reaction is finished, adding 50-200 g of ethanol, filtering to remove impurities to obtain colorless transparent liquid, and removing the ethanol by reduced pressure to obtain the Gemini surfactant;
s2, nano SiO2Surface hydrophobic modification
Weighing 0.01-2 g of nano SiO2Placing the mixture into a flask or a beaker, stirring, heating to 50-80 ℃, keeping the temperature for 10-20 min, weighing 0.1-50 g of ethanol, placing the ethanol into the flask, and preparing into 4.8wt% of nano SiO2Continuously stirring and dispersing the emulsion for 10min, adding 0.18-36 g of modifier dimethyldichlorosilane at one time, slowly dropwise adding 0.1-50 g of modification aid water, reacting for 18-24 h, centrifugally washing the obtained suspension for 3-4 times by using absolute ethyl alcohol, and drying to constant weight to obtain the hydrophobic modified nano SiO2；
S3. preparation of mineralized water
Dissolving 5-15 g of potassium chloride, 0.001-0.5 g of sodium sulfate, 0.001-0.5 g of sodium bicarbonate, 15-50 g of sodium chloride, 15-50 g of calcium chloride and 0.001-1 g of magnesium chloride into 1L of deionized water, stirring for 10-60 minutes, uniformly mixing, and completely dissolving to obtain 99.89-99.20 wt% of mineralized water required by a foam agent preparation system;
s4, CO suitable for high-temperature high-salinity oil reservoir2Preparation of the foamer System
Adding 0.01-0.30 wt% of gemini surfactant prepared in the step S1 into 99.89-99.20 wt% of mineralized water prepared in the step S3, stirring for 50-150 minutes, uniformly mixing, and then adding 0.10-0.50 wt% of hydrophobically modified nano SiO prepared in the step S22Stirring for 10-60 minutes, and uniformly mixing to obtain the CO suitable for the high-temperature high-salinity oil reservoir2A foamer system.
The preparation method of the yellow crystal A in the step S1 comprises the following steps: and (2) adding dodecyl alcohol polyoxyethylene ether in a formula amount into a flask, adding trichloromethane in the formula amount as a solvent, heating to 35-60 ℃, slowly dropwise adding thionyl chloride in the formula amount, reacting for 1-5 hours, and distilling under reduced pressure to obtain a yellow crystal A.
The preparation method of the white solid B in the step S1 comprises the following steps: putting ethylenediamine and potassium carbonate with the formula amount into a flask, and mixing the materials in a volume ratio of 30-60 mL (1-3): 1, taking an acetone-water mixed solution as a solvent, and adding 30mL of a solvent with a volume ratio (1-3): dissolving the ethanol-water mixed solution of 1, stirring and dissolving, heating to 30-60 ℃, and slowly dropwise adding the mixture, wherein the volume ratio of the mixture is (1-3): and (3) dissolving the 2-bromoethyl sodium sulfonate with the formula amount in the acetone-water mixed solution of 1, reacting for 5-20h at the temperature of 30-60 ℃, stopping the reaction, and carrying out reduced pressure distillation to obtain a white solid B.
The invention has the beneficial effects that:
(1) such CO in the present invention2The foaming agent system can effectively reduce the gas fluidity to water-oil fluidity ratio and avoid CO2Gas channeling and viscous fingering phenomena existing in the foam flooding process improve CO2And (4) foam flooding efficiency.
(2) The foaming agent system in the invention has better performance at high temperatureGood stability, promote CO2The development of the oil displacement project work of the foam has good application prospect.
Detailed Description
Example 1
CO suitable for high-temperature high-salinity oil reservoir2The foaming agent system is prepared by mixing the following components in percentage by weight:
gemini surfactants: 0.01-0.30 wt%;
hydrophobic modified nano SiO2：0.10％～0.50wt％；
Mineralization of water: 99.89 to 99.20 wt%.
The Gemini surfactant is prepared from a yellow crystal A and a white solid B in a mass ratio of (4-10): 1 in proportion;
CO according to the invention2The foaming agent system can effectively reduce the gas fluidity to water-oil fluidity ratio and avoid CO2Gas channeling and viscous fingering phenomena existing in the foam flooding process improve CO2And (4) foam flooding efficiency.
Example 2:
on the basis of example 1, the gemini surfactant is:
the specific synthetic method of the Gemini surfactant comprises the following steps:
taking the yellow crystal A and the potassium carbonate in a formula amount, placing the yellow crystal A and the potassium carbonate in a flask or a beaker, and mixing the yellow crystal A and the potassium carbonate in a volume ratio of (1-3): 1, stirring and dissolving, heating to 50-100 ℃, and slowly dropwise adding a mixed solution of 30mL (1-3): 1, stirring and reacting at 50-100 ℃ for 8-15 hours after dropwise adding, distilling under reduced pressure to remove the solvent after the reaction is finished, adding 50-200 g of ethanol, filtering to remove impurities to obtain colorless transparent liquid, and removing the ethanol under reduced pressure to obtain the Gemini surfactant.
The yellow crystal A is prepared from dodecyl alcohol polyoxyethylene ether, trichloromethane and thionyl chloride according to the mass ratio of (1-5): (1-5): 1 in proportion; the preparation method of the yellow crystal A comprises the following steps: and (2) adding dodecyl alcohol polyoxyethylene ether in a formula amount into a flask, adding trichloromethane in the formula amount as a solvent, heating to 35-60 ℃, slowly dropwise adding thionyl chloride in the formula amount, reacting for 1-5 hours, and distilling under reduced pressure to obtain a yellow crystal A. The molecular weight of the lauryl alcohol polyoxyethylene ether is 318.56-537.92.
The white solid B is prepared from ethylenediamine, potassium carbonate, a solvent and 2-bromoethyl sodium sulfonate according to a mass ratio of 1: (1-5): (50-55) and (5-10). The preparation method of the white solid B comprises the following steps: putting ethylenediamine and potassium carbonate with the formula amount into a flask, and mixing the materials in a volume ratio of 30-60 mL (1-3): 1, taking an acetone-water mixed solution as a solvent, and adding 30mL of a solvent with a volume ratio (1-3): dissolving the ethanol-water mixed solution of 1, stirring and dissolving, heating to 30-60 ℃, and slowly dropwise adding the mixture, wherein the volume ratio of the mixture is (1-3): and (3) dissolving the 2-bromoethyl sodium sulfonate with the formula amount in the acetone-water mixed solution of 1, reacting for 5-20h at the temperature of 30-60 ℃, stopping the reaction, and carrying out reduced pressure distillation to obtain a white solid B.
Example 3:
on the basis of example 1, the hydrophobically modified nano SiO2The particle size of the modified graphene is 10-100 nm, and the modification degree range is as follows: 30.2 to 76.4 percent.
The hydrophobic modified nano SiO2Namely, the nano SiO is treated by a modifier2Carrying out surface hydrophobic modification; the specific method comprises the following steps:
weighing 0.01-2 g of nano SiO2Placing the mixture into a flask or a beaker, stirring, heating to 50-80 ℃, keeping the temperature for 10-20 min, weighing 0.1-50 g of ethanol, placing the ethanol into the flask to prepare 4.8wt% of nano-silica emulsion, continuously stirring and dispersing for 10min, adding 0.18-36 g of modifier at one time, slowly dropwise adding 0.1-50 g of modification auxiliary water, reacting for 18-24 h, centrifugally washing the obtained suspension for 3-4 times by using absolute ethyl alcohol, and drying to constant weight to obtain the hydrophobically modified nano-SiO2。
Example 4:
based on the embodiment 1, the degree of mineralization of the mineralized water is 10000-80000 mg/L, and the temperature is 30-90 ℃.
The preparation method of the mineralized water comprises the following steps:
dissolving 5-15 g of potassium chloride, 0.001-0.5 g of sodium sulfate, 0.001-0.5 g of sodium bicarbonate, 15-50 g of sodium chloride, 15-50 g of calcium chloride and 0.001-1 g of magnesium chloride into 1L of deionized water, stirring for 10-60 minutes, uniformly mixing, and completely dissolving to obtain 99.89-99.20 wt% of mineralized water required by a foam agent preparation system
Example 5:
a preparation method of a CO2 foaming agent system suitable for a high-temperature high-salinity oil reservoir comprises the following steps:
s1, synthesis of gemini surfactant
Taking the yellow crystal A and the potassium carbonate in a formula amount, placing the yellow crystal A and the potassium carbonate in a flask or a beaker, and mixing the yellow crystal A and the potassium carbonate in a volume ratio of (1-3): 1, stirring and dissolving, heating to 50-100 ℃, and slowly dropwise adding a mixed solution of 30mL (1-3): 1, stirring and reacting at 50-100 ℃ for 8-15 hours after dropwise adding the white solid B dissolved in the acetone-water mixed solution, removing the solvent by reduced pressure distillation after the reaction is finished, adding 50-200 g of ethanol, filtering to remove impurities to obtain colorless transparent liquid, and removing the ethanol by reduced pressure to obtain the Gemini surfactant;
s2, nano SiO2Surface hydrophobic modification
Weighing 0.01-2 g of nano SiO2Placing the mixture into a flask or a beaker, stirring, heating to 50-80 ℃, keeping the temperature for 10-20 min, weighing 0.1-50 g of ethanol, placing the ethanol into the flask, and preparing into 4.8wt% of nano SiO2Continuously stirring and dispersing the emulsion for 10min, adding 0.18-36 g of modifier dimethyldichlorosilane at one time, slowly dropwise adding 0.1-50 g of modification aid water, reacting for 18-24 h, centrifugally washing the obtained suspension for 3-4 times by using absolute ethyl alcohol, and drying to constant weight to obtain the hydrophobic modified nano SiO2；
S3. preparation of mineralized water
Dissolving 5-15 g of potassium chloride, 0.001-0.5 g of sodium sulfate, 0.001-0.5 g of sodium bicarbonate, 15-50 g of sodium chloride, 15-50 g of calcium chloride and 0.001-1 g of magnesium chloride into 1L of deionized water, stirring for 10-60 minutes, uniformly mixing, and completely dissolving to obtain 99.89-99.20 wt% of mineralized water required by a foam agent preparation system;
s4, CO suitable for high-temperature high-salinity oil reservoir2Preparation of the foamer System
Adding 0.01-0.30 wt% of gemini surfactant prepared in the step S1 into 99.89-99.20 wt% of mineralized water prepared in the step S3, stirring for 50-150 minutes, uniformly mixing, and then adding 0.10-0.50 wt% of hydrophobically modified nano SiO prepared in the step S22Stirring for 10-60 minutes, and uniformly mixing to obtain the CO suitable for the high-temperature high-salinity oil reservoir2A foamer system.
Example 6:
CO suitable for high-temperature high-salinity oil reservoir2A method of preparing a foamable system comprising the steps of:
(1) synthesis of gemini surfactants
Taking 20-50 g of lauryl alcohol polyoxyethylene ether into a glass container such as a flask or a beaker, adding 15-60 mL of chloroform as a solvent, heating to 35-60 ℃, slowly dropwise adding 5-20 mL of thionyl chloride, reacting for 1-5 h, and carrying out reduced pressure distillation to obtain a product which is a yellow crystal A; putting 1-2 g of ethylenediamine and 5-10 g of potassium carbonate into a glass container such as a flask or a beaker, and mixing the materials in a ratio of 1: 1-3: adding 30-60 mL of acetone/water mixed solution with the volume ratio of 1 as a solvent into a mixture of the following components in a ratio of 1: 1-3: dissolving ethanol/water mixed solution with the volume ratio of 1, heating to 30-60 ℃ after stirring and dissolving, slowly dropwise adding 10-20 g of 2-bromoethyl sodium sulfonate dissolved in 30mL of mixed solution, reacting for 5-20h (30-60 ℃), stopping the reaction, and distilling under reduced pressure to obtain white solid B; placing 30-50 g of yellow crystal A and 5-10 g of potassium carbonate into a single-neck flask, taking an acetone/water mixed solution with a certain volume ratio as a solvent, stirring and dissolving, heating to 50-100 ℃, and slowly dropwise adding a mixture of 30mL of a solution with a volume ratio of 1: 1-3: 5-10 g of white solid B dissolved in the acetone-water mixed solution 1 is stirred and reacted for 8-15 h at the temperature of 50-100 ℃ after the dropwise addition is finished. And (3) after the reaction is finished, distilling under reduced pressure to remove the solvent, adding 50-200 g of ethanol, filtering to remove impurities to obtain colorless transparent liquid, and removing the ethanol under reduced pressure to obtain the Gemini surfactant.
(2) Nano SiO2Surface hydrophobic modification
Weighing 0.01-2 g of nano SiO2Placing the mixture into a three-mouth bottle, stirring, heating to a certain temperature (50-80 ℃), and keeping the temperature for 10-20 min. Weighing 0.1-50 g of ethanol, placing the ethanol in a three-necked bottle to prepare emulsion with the nano-silicon dioxide mass fraction of 4.8wt%, continuously stirring and dispersing for 10min, and adding all dimethyldichlorosilane (SiO) at one time2The molar ratio of the modified silane to the dimethyldichlorosilane is 1: 18-2: 1), and then 0.1-50 g of modified auxiliary agent water is slowly dripped. After reacting for 18-24 h, centrifugally washing the suspension liquid for 3-4 times by using absolute ethyl alcohol, and drying to constant weight to obtain the product.
(3) Preparation of mineralized water
Dissolving 5-15 g of potassium chloride, 0.001-0.5 g of sodium sulfate, 0.001-0.5 g of sodium bicarbonate, 15-50 g of sodium chloride, 15-50 g of calcium chloride and 0.001-1 g of magnesium chloride into 1L of deionized water, stirring for 10-60 minutes, uniformly mixing, and ensuring complete dissolution to obtain mineralized water required for preparing the foaming agent;
(4) CO suitable for high-temperature high-salt oil reservoir2Preparation of the foamer System
Adding 0.01-0.30 wt% of gemini surfactant into the prepared mineralized water, stirring for 50-150 minutes, uniformly mixing, and then adding 0.10-0.50 wt% of hydrophobic modified nano SiO2And (3) stirring the particles for 10-60 minutes, and uniformly mixing to finish the preparation of the foaming agent system.
Example 7:
preparing sodium chloride mineralized water with the mineralization degree of 10000mg/L, and stirring for 20 minutes to completely dissolve the sodium chloride mineralized water; adding 0.01 wt% of gemini surfactant into the prepared mineralized water, stirring for 100 minutes, uniformly mixing, and then adding 1% of hydrophobic modified nano SiO2Granulating, stirring for 20 minutes, and uniformly mixing to obtain a mixed solution; stirring at 10000rpm for foaming at high speed to obtain foam with volume of 6.5 times and half-life of 44 min at normal temperature and pressure.
Example 8:
the embodiment provides CO suitable for a high-temperature and high-salinity reservoir2A foaming agent system, wherein sodium chloride mineralized water with the mineralization degree of 50000mg/L is prepared, stirred for 40 minutes and uniformly mixed to ensure complete dissolution; adding 0.015 wt% of gemini surfactant into the prepared mineralized water, stirring for 120 minutes, uniformly mixing, and then adding 0.1 wt% of hydrophobic modified nano SiO2The particles are stirred for 30 minutes, mixed evenly and stirred at high speed under 10000rpm for foaming, the volume of the obtained foam can reach 64.2 times, and the foam half-life period is 34.5 minutes under 6MPa and 75 ℃.
Example 9:
the embodiment provides CO suitable for a high-temperature and high-salinity reservoir2A foaming agent system, wherein mineralized water with the total mineralization degree of 80000mg/L is prepared, the mineralized water comprises 71000mg/L sodium chloride mineralized water, 4000mg/L calcium chloride mineralized water, 500mg/L sodium bicarbonate mineralized water and 4500mg/L barium chloride mineralized water, and the mixture is stirred for 40 minutes and uniformly mixed to ensure complete dissolution; adding 0.09 wt% of gemini surfactant into the prepared mineralized water, stirring for 120 minutes, uniformly mixing, and then adding 0.5 wt% of hydrophobic modified nano SiO2The particles are stirred for 30 minutes, mixed evenly and stirred at high speed under 10000rpm for foaming, the volume of the obtained foam can reach 7.3 times, and the foam half-life period is 52.8 minutes under 8MPa and 80 ℃.
Example 10:
the embodiment provides a commonly used anionic surfactant Sodium Dodecyl Sulfate (SDS) and nano silicon dioxide compound system.
Preparing sodium chloride mineralized water with the mineralization degree of 60000mg/L, and stirring for 20 minutes to completely dissolve the sodium chloride mineralized water; adding 0.1 wt% SDS into the prepared mineralized water, stirring for 100 minutes, uniformly mixing, and then adding 1% hydrophobic modified nano SiO2Granulating, stirring for 20 minutes, and uniformly mixing to obtain a mixed solution; stirring at 10000rpm at high speed to foam, the obtained foam volume can reach 5.8 times, and the foam half-life period is 15.5 minutes at normal temperature and normal pressure.
As can be seen from comparative examples 7-10, the foam formulation system of the present invention has good stability at high temperaturesPromote CO2The development of the oil displacement project work of the foam has good application prospect.
The invention relates to dodecyl alcohol polyoxyethylene ether, trichloromethane, thionyl chloride, ethylenediamine, potassium carbonate, acetone, ethanol, 2-bromoethyl sodium sulfonate and nano SiO2The reagent is a common reagent in the oil field industry and can be purchased in the market.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention, and all designs identical or similar to the present invention are within the scope of the present invention.
Claims (7)
1. CO suitable for high-temperature high-salinity oil reservoir2A foamable system characterized by: the adhesive is prepared by mixing the following components in percentage by weight:
gemini surfactants: 0.01-0.30 wt%;
hydrophobic modified nano SiO2：0.10%~0.50wt%；
Mineralization of water: 99.89-99.20 wt%;
the Gemini surfactant is prepared from a yellow crystal A and a white solid B in a mass ratio of (4-10): 1 in proportion;
the yellow crystal A is prepared from dodecyl alcohol polyoxyethylene ether, trichloromethane and thionyl chloride according to the mass ratio of (1-5): (1-5): 1 in proportion;
the white solid B is prepared from ethylenediamine, potassium carbonate, a solvent and 2-bromoethyl sodium sulfonate according to a mass ratio of 1: (1-5): (50-55) and (5-10).
2. CO suitable for high-temperature and high-salinity oil reservoirs according to claim 12A foamable system characterized by: the molecular weight of the lauryl alcohol polyoxyethylene ether is 318.56-537.92.
3. CO suitable for high-temperature and high-salinity oil reservoirs according to claim 12A foamable system characterized by: the hydrophobic modified nano SiO2The particle size of the modified graphene is 10-100 nm, and the modification degree range is as follows: 30.2% -76.4%.
4. CO suitable for high-temperature and high-salinity oil reservoirs according to claim 12A foamable system characterized by: the degree of mineralization of the mineralized water is 10000-80000 mg/L.
5. CO suitable for high-temperature high-salinity oil reservoir2Method for preparing a foamer system comprising at least CO suitable for high temperature and high salinity reservoirs according to any of claims 1-42A foamable system, comprising the steps of:
s1, synthesizing a Gemini surfactant,
taking the yellow crystal A and the potassium carbonate in a formula amount, placing the yellow crystal A and the potassium carbonate in a flask or a beaker, and mixing the yellow crystal A and the potassium carbonate in a volume ratio of (1-3): 1, stirring and dissolving, heating to 50-100 ℃, and slowly dropwise adding a mixed solution of 30mL (1-3): 1, stirring and reacting at 50-100 ℃ for 8-15 hours after dropwise adding the white solid B dissolved in the acetone-water mixed solution, removing the solvent by reduced pressure distillation after the reaction is finished, adding 50-200 g of ethanol, filtering to remove impurities to obtain colorless transparent liquid, and removing the ethanol by reduced pressure to obtain the Gemini surfactant;
s2, nano SiO2Surface hydrophobic modification
Weighing 0.01-2 g of nano SiO2Placing the mixture into a flask or a beaker, stirring, heating to 50-80 ℃, keeping the temperature for 10-20 min, weighing 0.1-50 g of ethanol, placing the ethanol into the flask, and preparing into 4.8wt% of nano SiO2Continuously stirring and dispersing the emulsion for 10min, adding 0.18-36 g of modifier dimethyldichlorosilane at one time, slowly dropwise adding 0.1-50 g of modification aid water, reacting for 18-24 h, centrifugally washing the obtained suspension for 3-4 times by using absolute ethyl alcohol, and drying to constant weight to obtain the hydrophobic modified nano SiO2；
S3. preparation of mineralized water
Dissolving 5-15 g of potassium chloride, 0.001-0.5 g of sodium sulfate, 0.001-0.5 g of sodium bicarbonate, 15-50 g of sodium chloride, 15-50 g of calcium chloride and 0.001-1 g of magnesium chloride into 1L of deionized water, stirring for 10-60 minutes, uniformly mixing, and completely dissolving to obtain 99.89-99.20 wt% of mineralized water required by a foam agent preparation system;
s4, CO suitable for high-temperature high-salinity oil reservoir2Preparation of the foamer System
Adding 0.01-0.30 wt% of gemini surfactant prepared in the step S1 into 99.89-99.20 wt% of mineralized water prepared in the step S3, stirring for 50-150 minutes, uniformly mixing, and then adding 0.10-0.50 wt% of hydrophobically modified nano SiO prepared in the step S22Stirring for 10-60 minutes, and uniformly mixing to obtain the CO suitable for the high-temperature high-salinity oil reservoir2A foamer system.
6. CO suitable for high-temperature and high-salinity oil reservoirs according to claim 52The preparation method of the foaming agent system is characterized in that the preparation method of the yellow crystal A in the step S1 is as follows: and (2) adding dodecyl alcohol polyoxyethylene ether in a formula amount into a flask, adding trichloromethane in the formula amount as a solvent, heating to 35-60 ℃, slowly dropwise adding thionyl chloride in the formula amount, reacting for 1-5 hours, and distilling under reduced pressure to obtain a yellow crystal A.
7. CO suitable for high-temperature and high-salinity oil reservoirs according to claim 52The preparation method of the foaming agent system is characterized in that the preparation method of the white solid B in the step S1 is as follows: putting ethylenediamine and potassium carbonate with the formula amount into a flask, and mixing the materials in a volume ratio of 30-60 mL (1-3): 1, taking an acetone-water mixed solution as a solvent, and adding 30mL of a solvent with a volume ratio (1-3): dissolving the ethanol-water mixed solution of 1, stirring and dissolving, heating to 30-60 ℃, and slowly dropwise adding the mixture, wherein the volume ratio of the mixture is (1-3): and (3) dissolving the 2-bromoethyl sodium sulfonate with the formula amount in the acetone-water mixed solution of 1, reacting for 5-20h at the temperature of 30-60 ℃, stopping the reaction, and carrying out reduced pressure distillation to obtain a white solid B.
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| CN114316939B (en) * | 2022-01-05 | 2022-07-22 | 东北石油大学 | Carbon dioxide gas soluble foaming agent suitable for compact reservoir |
| CN115895626B (en) * | 2022-11-09 | 2023-10-10 | 山东新港化工有限公司 | Low permeability reservoir potentiating CO 2 Corrosion inhibition type nano foam oil washing agent for driving and preparation method and application thereof |
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