CN113980667A - Environment-friendly composite oil displacement system and preparation method thereof - Google Patents
Environment-friendly composite oil displacement system and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/584—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific surfactants
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- C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
- C08H6/00—Macromolecular compounds derived from lignin, e.g. tannins, humic acids
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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
- C09K8/588—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 polymers
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Abstract
The invention provides an environment-friendly composite oil displacement system and a preparation method thereof, and relates to the field of tertiary oil recovery enhancement in oil exploitation. The environment-friendly composite oil displacement system comprises the following components in parts by weight: 3-5 parts of tap water, 6-8 parts of fatty acid lignin ester solution, 1-2 parts of alkanolamide surfactant and 0.05-0.1 part of polydimethylsiloxane. The composite oil displacement system does not contain polyether, sulfonate and phosphorus-containing surfactant, has small influence on environment, low biological toxicity and lower cost, reduces the cost by more than 25 percent compared with the prior petroleum sulfonate and alkylbenzene sulfonate surfactant, and reduces the cost by at least more than 50 percent compared with alkyl glycoside and biological surfactant.
Description
Technical Field
The invention relates to the field of tertiary oil recovery and recovery efficiency improvement in oil exploitation, in particular to an environment-friendly compound oil displacement system and a preparation method thereof.
Background
At present, the water content of most of oil well produced liquid in China is up to 90%, and the difficulty in improving the crude oil production degree is increased. The surfactant has excellent oil washing efficiency, emulsifying property, capability of reducing oil-water interfacial tension and the like, and is widely applied to the technology of improving the recovery ratio in tertiary oil recovery.
The surfactant applied to the field is a compound mixture of a plurality of components. Of these, sulfonate, phosphate and polyoxyethylene ether surfactants are used in many applications. These surfactants all have the disadvantage of being difficult to degrade and of high biotoxicity.
The environment-friendly and low-toxicity surfactant mainly comprises betaine, alkyl glycoside, alkanolamide and biosurfactant. However, these surfactants generally have a problem of high cost.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an environment-friendly composite oil displacement system and a preparation method thereof, solves the problems of complex compounding of the existing oil displacement system, toxicity of the used surfactant and high use cost, and aims to provide a low-cost environment-friendly oil displacement surfactant system and a preparation method thereof.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: an environment-friendly composite oil displacement system and a preparation method thereof, which comprises the following components by weight: 3-5 parts of tap water, 6-8 parts of fatty acid lignin ester solution, 1-2 parts of alkanolamide surfactant and 0.05-0.1 part of polydimethylsiloxane.
Preferably, the content of the effective components in the fatty acid lignin ester solution is 50-60%.
Preferably, the alkanolamide surfactant can be one or a combination of more of lauric acid diethanolamide, palmitic acid diethanolamide, oleic acid diethanolamide, stearic acid diethanolamide and coconut oil diethanolamide, and the content of the effective components is more than 95%.
Preferably, the fatty acid lignin ester solution is prepared by the following steps:
the method comprises the following steps: purification of alkali lignin
Preparing an alkali lignin solution with the mass concentration of 40% by using tap water with the water temperature of 20-40 ℃, adjusting the pH value of the solution to 9-12 by using anhydrous sodium carbonate, stirring for 15-30 minutes, standing for 20-60 minutes, and filtering the solution by using a 500-mesh stainless steel net for later use;
step two: preparation of mixed fatty acids
The method for synthesizing the mixed fatty acid and the byproduct glycerin by using the grease with the main component of the mixed fatty glyceride comprises the following steps: adding 300g of tap water into a reaction kettle, starting stirring, adding 25g of NaOH, adding 150g of grease with the main component of mixed fatty glyceride, heating to 65-80 ℃, stirring at constant temperature for 5 hours, standing at constant temperature for 30min, separating and removing water and glycerol at the lower part by using a separating funnel to obtain mixed fatty acid at the upper part, and filtering the mixed fatty acid by using a 500-mesh stainless steel net for later use;
step three: preparation of fatty acid lignin ester solution
Adding 100-200 g of the purified lignin solution obtained in the first step into a reaction kettle, starting stirring, heating to 90-95 ℃, adding 10-20 g of mixed fatty acid, adding 0.1g of platinum-carbon catalyst (Pt/C), sealing, preserving heat at 160-190 ℃, stirring for 6-9 hours, cooling to 20-40 ℃, adding a 500-mesh stainless steel net at the outlet of the reaction kettle, filtering out the catalyst, and obtaining the filtered liquid, namely the fatty acid lignin ester solution.
Preferably, the oil and fat with the main component of mixed fatty glyceride is any one or combination of illegal cooking oil and waste animal and vegetable oil and fat, wherein the illegal cooking oil is required to contain less than 2% of water, the solid particle content is less than 1%, and the decoloration is not required.
Preferably, the filtered catalyst is washed with 1% NaOH solution in distilled water at 80 ℃ for 2 times and then reused.
Preferably, the platinum-carbon catalyst (Pt/C) requires that the average carrier particle diameter is 80 μm or more, the impurity content is less than 0.3%, and the Pt content is 5% +/-0.2%.
Adding tap water into a reaction kettle, heating to 20-40 ℃, keeping the temperature constant, starting stirring, adding a fatty acid lignin ester solution, stirring for 10-30 minutes, adding polydimethylsiloxane and alkanolamide surfactants, stirring for 30-60 minutes at the constant temperature of 20-40 ℃, discharging from the kettle, and barrel-packaging to obtain the product.
(III) advantageous effects
The invention provides an environment-friendly composite oil displacement system and a preparation method thereof. The method has the following beneficial effects:
the composite oil displacement system does not contain polyether, sulfonate and phosphorus-containing surfactant, has small influence on environment, low biological toxicity and lower cost, reduces the cost by more than 25 percent compared with the prior petroleum sulfonate and alkylbenzene sulfonate surfactant, and reduces the cost by at least more than 50 percent compared with alkyl glycoside and biological surfactant.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the embodiment of the invention provides a preparation method of an environment-friendly composite oil displacement system, which comprises the following preparation steps:
the method comprises the following steps: preparation of alkali lignin solution
Weighing 80g of alkali lignin and 120g of tap water, mixing and stirring at 20 ℃ for 20min, adjusting the pH value of the solution to 9.5 by using anhydrous sodium carbonate, stirring for 25 min, standing for 30min, and filtering the solution by using a 500-mesh stainless steel net for later use;
step two: preparation of mixed fatty acids
The raw materials are illegal cooking oil and sodium hydroxide, and the preparation method comprises the following steps: adding 300g of tap water into a reaction kettle, starting stirring, adding 25g of NaOH, adding 150g of illegal cooking oil, heating to 65 ℃, stirring at constant temperature for 5 hours, standing at constant temperature for 30min, separating and removing water and glycerol at the lower part by using a separating funnel to obtain mixed fatty acid at the upper part, and filtering the mixed fatty acid by using a 500-mesh stainless steel net for later use;
step three: preparation of fatty acid lignin ester solution
Adding 100g of the purified lignin solution obtained in the step one into a high-temperature high-pressure stainless steel reaction kettle, heating to 90 ℃, starting stirring, adding 10g of mixed fatty acid, adding 0.1g of platinum-carbon catalyst (Pt/C), sealing, keeping the temperature of 160 ℃, stirring for 6 hours, cooling to 40 ℃, pouring out reaction liquid, filtering the catalyst by using a 500-mesh stainless steel net, filtering the filtered liquid, namely the fatty acid lignin ester solution, wherein the content of active substances is 50%, using 1% NaOH distilled water solution to filter the filtered catalyst, washing for 2 times at 80 ℃, and then repeatedly using.
Step four: compounding composite oil displacing system
Respectively weighing 30g of tap water, 60g of fatty acid lignin ester solution, 10g of lauric acid diethanolamide and 0.5g of polydimethylsiloxane in sequence; the preparation method comprises the following steps: adding tap water into a reaction kettle, heating to 20 ℃, keeping the temperature constant, starting stirring, adding the fatty acid lignin ester solution, stirring for 10 minutes, adding polydimethylsiloxane and lauric acid diethanolamide, and stirring for 30 minutes at the constant temperature of 20 ℃ to obtain the environment-friendly composite oil displacement system.
The performance experiment evaluation of the composite oil displacement system: the experimental water is field water, the reinjection sewage is taken from the Hongkong oil field Hongkong district, the experimental oil is crude oil of the Hongkong oil field Hongkong district oil well, the SY/T5370-plus 2018 (industry standard) surface and interface tension measuring method is carried out according to the experimental standard, the oil-water interface tension value of the composite oil displacement system solution is tested, the oil-water interface tension is 7.6 multiplied by 10 < -3 > mN/m through the test, and the requirement of the surfactant for oil displacement is met.
The effective content of lauric acid diethanolamide is 98%.
Example two:
the embodiment of the invention provides a preparation method of an environment-friendly composite oil displacement system, which comprises the following preparation steps:
the method comprises the following steps: preparation of alkali lignin solution
Weighing 80g of alkali lignin and 120g of tap water, mixing and stirring at 40 ℃ for 20min, adjusting the pH value of the solution to 12 by using anhydrous sodium carbonate, stirring for 25 min, standing for 60min, and filtering the solution by using a 500-mesh stainless steel net for later use;
step two: preparation of mixed fatty acids
The raw materials are waste animal and vegetable oil and sodium hydroxide; the preparation method comprises the following steps: adding 300g of tap water into a reaction kettle, starting stirring, adding 25g of NaOH, adding 150g of waste animal and vegetable oil, heating to 80 ℃, stirring at constant temperature for 5 hours, standing at constant temperature for 30min, separating and removing water and glycerol at the lower part by using a separating funnel to obtain mixed fatty acid at the upper part, and filtering the mixed fatty acid by using a 500-mesh stainless steel net for later use;
step three: preparation of fatty acid lignin ester solution
Adding 100g of the purified lignin solution obtained in the step one into a high-temperature high-pressure stainless steel reaction kettle, heating to 95 ℃, starting stirring, adding 20g of mixed fatty acid, adding 0.1g of platinum-carbon catalyst (Pt/C), sealing, preserving heat, and stirring for 9 hours at 190 ℃. Cooling to 40 ℃, pouring out the reaction liquid, filtering out the catalyst by using a 500-mesh stainless steel net, wherein the filtered liquid is the fatty acid lignin ester solution, the content of the effective substances is 60%, and the filtered catalyst is repeatedly used after being washed for 2 times at 80 ℃ by using 1% NaOH distilled water solution;
step four: compounding composite oil displacing system
Respectively weighing 50g of tap water, 80g of fatty acid lignin ester solution, 20g of palmitic acid diethanolamide and 0.5g of polydimethylsiloxane in sequence; the preparation method comprises the following steps: adding tap water into a reaction kettle, heating to 40 ℃, keeping the temperature constant, starting stirring, adding the fatty acid lignin ester solution, stirring for 10 minutes, adding polydimethylsiloxane and palmitic acid diethanolamide, and stirring for 30 minutes at the constant temperature of 40 ℃ to obtain the environment-friendly composite oil displacement system.
The performance experiment evaluation of the composite oil displacement system: the experimental water is field water, the reinjection sewage is taken from the Hongkong oil field Hongkong district, the experimental oil is crude oil of the Hongkong oil field Hongkong district oil well, the SY/T5370-plus 2018 (industry standard) surface and interface tension measuring method is carried out according to the experimental standard, the oil-water interface tension value of the composite oil displacement system solution is tested, the oil-water interface tension is 2.9 multiplied by 10 < -3 > mN/m through the test, and the requirement of the surfactant for oil displacement is met.
Wherein the effective content of the palmitic acid diethanolamide is more than 98 percent.
Example three:
the embodiment of the invention provides a preparation method of an environment-friendly composite oil displacement system, which comprises the following preparation steps:
the method comprises the following steps: preparation of alkali lignin solution
Weighing 80g of alkali lignin and 120g of tap water, mixing and stirring at 20 ℃ for 20min, adjusting the pH value of the solution to 10 by using anhydrous sodium carbonate, stirring for 30min, standing for 20min, and filtering the solution by using a 500-mesh stainless steel net for later use;
step two: preparation of mixed fatty acids
The raw materials are waste oil, waste animal and vegetable oil and sodium hydroxide which are used in combination in any proportion; the preparation method comprises the following steps: adding 300g of tap water into a reaction kettle, starting stirring, adding 25g of NaOH, adding 150g of swill-cooked dirty oil and waste animal and vegetable oil and fat composition, heating to 80 ℃, stirring at constant temperature for 5 hours, standing at constant temperature for 30min, separating and removing water and glycerin at the lower part by using a separating funnel to obtain mixed fatty acid at the upper part, and filtering the mixed fatty acid by using a 500-mesh stainless steel net for later use;
step three: preparation of fatty acid lignin ester solution
Adding 200g of the purified lignin solution obtained in the step one into a high-temperature high-pressure stainless steel reaction kettle, heating to 90 ℃, starting stirring, adding 20g of mixed fatty acid, adding 0.1g of platinum-carbon catalyst (Pt/C), sealing, keeping the temperature at 190 ℃, stirring for 9 hours, cooling to 40 ℃, pouring out reaction liquid, filtering the reaction liquid by using a 500-mesh stainless steel net, and filtering the obtained liquid to obtain the fatty acid lignin ester solution with the effective substance content of 50%. Washing the filtered catalyst with 1% NaOH distilled water solution at 80 deg.C for 2 times, and reusing;
step four: compounding composite oil displacing system
Sequentially weighing 30g of tap water, 60g of fatty acid lignin ester solution, 10g of equivalent lauric acid diethanolamide and stearic acid diethanolamide and 1g of polydimethylsiloxane; the preparation method comprises the following steps: adding water into a reaction kettle, heating to 40 ℃, keeping the temperature constant, starting stirring, adding the fatty acid lignin ester solution, stirring for 30 minutes, adding polydimethylsiloxane, lauric acid diethanolamide and stearic acid diethanolamide, and stirring for 60 minutes at the constant temperature of 40 ℃ to obtain the environment-friendly composite oil displacement system.
The performance experiment evaluation of the composite oil displacement system: the experimental water is field water, the reinjection sewage is taken from the Hongkong oil field Hongkong district, the experimental oil is crude oil of the Hongkong oil field Hongkong district oil well, the SY/T5370-plus 2018 (industry standard) surface and interface tension measuring method is carried out according to the experimental standard, the oil-water interface tension value of the composite oil displacement system solution is tested, the oil-water interface tension is 4.5 multiplied by 10 < -3 > mN/m through the test, and the requirement of the surfactant for oil displacement is met.
Wherein the contents of effective components of lauric acid diethanolamide and stearic acid diethanolamide are respectively 98% and 97%.
In the first to third embodiments of the invention, the waste oil, the waste animal and vegetable oil, the alkali lignin, the sodium carbonate, the platinum-carbon catalyst (Pt/C), the polydimethylsiloxane and the alkanolamide surfactant are all commercially available, wherein the polydimethylsiloxane is liquid, the viscosity is 2500 centipoises at 25 ℃, the volume is 0.5L, the maximum pressure is 15MPa, the maximum temperature is 270 ℃, and a Texas-500TM rotating drop ultra-low interfacial tensiometer is used.
In addition, the cost of the prior oil-displacing surfactant is about 1 ten thousand yuan per ton, and the invention takes cheap lignin (the cost is less than 1 thousand yuan per ton) and illegal cooking oil (the cost is less than 2 thousand yuan per ton) as raw materials.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. An environment-friendly composite oil displacement system and a preparation method thereof are characterized by comprising the following components by weight: 3-5 parts of tap water, 6-8 parts of fatty acid lignin ester solution, 1-2 parts of alkanolamide surfactant and 0.05-0.1 part of polydimethylsiloxane.
2. The environment-friendly composite oil displacement system of claim 1, which is characterized in that: the content of effective components of the fatty acid lignin ester solution is 50-60%.
3. The environment-friendly composite oil displacement system of claim 1, which is characterized in that: the alkanolamide surfactant can be one or more of lauric acid diethanolamide, palmitic acid diethanolamide, oleic acid diethanolamide, stearic acid diethanolamide and coconut oil diethanolamide, and the content of the effective components is more than 95%.
4. The environment-friendly composite oil displacement system of claim 1, wherein the fatty acid lignin ester solution is prepared by the following steps:
the method comprises the following steps: purification of alkali lignin
Preparing an alkali lignin solution with the mass concentration of 40% by using tap water with the water temperature of 20-40 ℃, adjusting the pH value of the solution to 9-12 by using anhydrous sodium carbonate, stirring for 15-30 minutes, standing for 20-60 minutes, and filtering the solution by using a 500-mesh stainless steel net for later use;
step two: preparation of mixed fatty acids
The method for synthesizing the mixed fatty acid and the byproduct glycerin by using the grease with the main component of the mixed fatty glyceride comprises the following steps: adding 300g of tap water into a reaction kettle, starting stirring, adding 25g of NaOH, adding 150g of grease with the main component of mixed fatty glyceride, heating to 65-80 ℃, stirring at constant temperature for 5 hours, standing at constant temperature for 30min, separating and removing water and glycerol at the lower part by using a separating funnel to obtain mixed fatty acid at the upper part, and filtering the mixed fatty acid by using a 500-mesh stainless steel net for later use;
step three: preparation of fatty acid lignin ester solution
Adding 100-200 g of the purified lignin solution obtained in the first step into a reaction kettle, starting stirring, heating to 90-95 ℃, adding 10-20 g of mixed fatty acid, adding 0.1g of platinum-carbon catalyst (Pt/C), sealing, preserving heat at 160-190 ℃, stirring for 6-9 hours, cooling to 20-40 ℃, adding a 500-mesh stainless steel net at the outlet of the reaction kettle, filtering out the catalyst, and obtaining the filtered liquid, namely the fatty acid lignin ester solution.
5. The environment-friendly composite oil displacement system of claim 4, which is characterized in that: the grease with the main component of mixed fatty glyceride is any one or combination of illegal cooking oil and waste animal and vegetable grease, wherein the illegal cooking oil is required to contain less than 2% of water, the solid particle content is less than 1%, and the grease does not need to be decolored.
6. The environment-friendly composite oil displacement system of claim 4, which is characterized in that: the filtered catalyst was washed with 1% NaOH in distilled water at 80 ℃ for 2 times and then reused.
7. The environment-friendly composite oil displacement system of claim 1, which is characterized in that: the platinum-carbon catalyst (Pt/C) requires that the average carrier particle diameter is 80 μm or more, the impurity content is less than 0.3%, and the Pt content is 5% +/-0.2%.
8. A preparation method of an environment-friendly composite oil displacement system is characterized by comprising the following steps: adding tap water into a reaction kettle, heating to 20-40 ℃, keeping the temperature constant, starting stirring, adding the fatty acid lignin ester solution, stirring for 10-30 minutes, adding polydimethylsiloxane and alkanolamide surfactants, stirring for 30-60 minutes at the constant temperature of 20-40 ℃, taking out of the kettle, and barrel-packaging to obtain the product.
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2021
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| US20180037598A1 (en) * | 2015-02-18 | 2018-02-08 | Nutech Ventures | Methods of making and using lignin derivatives |
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Application publication date: 20220128 |