CN115819635A - Multifunctional alkali-free viscoelastic thickener for improving recovery ratio and preparation method thereof - Google Patents
Multifunctional alkali-free viscoelastic thickener for improving recovery ratio and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of oil field exploitation, and provides a multifunctional alkali-free viscoelastic thickener for improving the recovery ratio and a preparation method thereof. Through the technical scheme, the problem of low recovery ratio caused by low viscosity and poor temperature resistance of the thickening agent in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of oilfield exploitation, in particular to a multifunctional alkali-free viscoelastic thickener for improving the recovery ratio and a preparation method thereof.
Background
The oil field can only extract about 30-40% of underground petroleum reserve by first extraction (self-injection) and second extraction (water injection flooding), and 60-70% of crude oil still remains underground. These residual oils are often trapped in the pores of porous rocks and are difficult to drain under normal water injection pressures due to capillary action. Therefore, in the later stage of water flooding, the water content of produced liquid is gradually increased, and when the water content reaches more than 90%, the economic benefit of water flooding is obviously reduced. Any new technology adopted after water flooding is collectively called tertiary oil recovery technology, including thermal flooding, miscible flooding, chemical flooding and the like. Wherein the chemical flooding is to further improve the recovery efficiency by injecting chemical agents, such as alkali, surfactants, polymers, etc., by reducing the crude oil/water interfacial tension, changing the wettability of the rock surface, improving the oil sweeping efficiency, etc.
However, the recovery ratio of the oil displacement agent is low at present, and the addition of the alkali sacrificial agent in the oil displacement agent can cause damage to a bottom layer and corrosion to injection and production equipment, so that an alkali-free oil displacement agent needs to be developed to reduce the damage to a stratum and the corrosion to the equipment, improve the temperature resistance and the viscosity of a thickening agent in the oil displacement agent and improve the recovery ratio.
Disclosure of Invention
The technical scheme of the invention is as follows:
a multifunctional alkali-free viscoelastic thickener for improving the recovery efficiency is prepared by modifying guanidine collagen powder with resorcinol diglycidyl ether and lauryl alcohol glycidyl ether.
A preparation method of a multifunctional alkali-free viscoelastic thickener for improving recovery efficiency comprises the following steps:
s1, adding guanidine collagen powder and sodium hydroxide into an ethanol solution and stirring;
s2, after the temperature is raised, continuously stirring to obtain a mixture A;
s3, adding resorcinol diglycidyl ether into the mixture A, and reacting to obtain a mixture B;
s4, adding lauryl alcohol glycidyl ether into the mixture B, and reacting to obtain a mixture C;
and S5, cooling, filtering and drying the mixture C to obtain the thickening agent.
As a further technical scheme, the mass ratio of the guanidine collagen powder to the ethanol in the step S1 is 1:5.
As a further technical scheme, the mass ratio of the guanidine collagen powder to the sodium hydroxide in the step S1 is 10.05-0.1.
As a further technical scheme, the mass ratio of the resorcinol diglycidyl ether to the guanidine collagen powder in the step S3 is 0.5-1.5.
As a further technical scheme, the reaction temperature in the step S3 is 52-56 ℃, and the reaction time is 4-5h.
According to a further technical scheme, the mass ratio of the lauryl alcohol glycidyl ether to the guanidine collagen powder in the step S4 is 1.5-2.
As a further technical scheme, in the step S4, the temperature is raised to 52-56 ℃, and the reaction time is 4-5h.
The oil displacement agent for improving the recovery ratio comprises the thickening agent.
As a further technical scheme, the paint comprises the following components in parts by weight: 20-25 parts of thickening agent, 30-33 parts of fluorocarbon surfactant, 10-15 parts of diethylene glycol butyl ether, 10-20 parts of dodecyl primary amine and 10000-15000 parts of water.
The working principle and the beneficial effects of the invention are as follows:
1. according to the invention, the guanidine gum is treated by resorcinol diglycidyl ether, a cross-linking network is formed among the guanidine gum molecules, the thermal stability of a macromolecule can be improved, the thickening effect of the thickening agent is greatly improved, the guanidine gum is subjected to hydrophobic modification by lauryl alcohol glycidyl ether treatment, hydrophobic groups are introduced, the heat resistance and the stability of the guanidine gum are enhanced, and the recovery ratio is further improved. Therefore, the invention has better temperature resistance, can resist the temperature of 180 ℃, has wide application range to the formation temperature and has high recovery ratio.
2. In the invention, the guanidine gum is a natural high molecular compound, can greatly reduce the adsorption of stratum to effective components, and can reduce the damage to the stratum and the corrosion to injection and production equipment without injecting an alkali sacrificial agent during stratum displacement of reservoir oil.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive step, are intended to be within the scope of the present invention.
Example 1
A preparation method of a multifunctional alkali-free viscoelastic thickener for improving recovery efficiency comprises the following steps:
s1, adding 10g of guanidine collagen powder into 50g of 95% ethanol solution for dispersion, adding 0.06g of sodium hydroxide, and stirring;
s2, heating to 45 ℃, and continuously stirring for 1h to obtain a mixed solution;
s3, adding 0.5g of resorcinol diglycidyl ether into the mixed solution, heating to 55 ℃, and reacting for 5 hours to obtain a mixture A;
s4, adding 2g of lauryl alcohol glycidyl ether into the mixture A, heating to 55 ℃, and reacting for 5 hours to obtain a mixture B;
and S5, cooling and filtering the mixture B, and drying at 60 ℃ to obtain the thickening agent.
The preparation method of the oil displacement agent comprises the following steps:
a1, adding 23 parts of thickening agent into 10000 parts of water, and stirring and swelling for 4 hours at 30 ℃ to prepare thickening agent solution.
And A2, adding 30 parts of fluorocarbon surfactant, 10 parts of diethylene glycol butyl ether and 15 parts of dodecyl primary amine into the thickener solution, and mixing to obtain the oil displacement agent.
Example 2
A preparation method of a multifunctional alkali-free viscoelastic thickener for improving recovery efficiency comprises the following steps:
s1, adding 10g of guanidine collagen powder into 50g of 95% ethanol solution for dispersion, adding 0.05g of sodium hydroxide, and stirring;
s2, raising the temperature to 43 ℃, and continuing stirring for 0.5h to obtain a mixed solution;
s3, adding 0.5g of resorcinol diglycidyl ether into the mixed solution, heating to 52 ℃, and reacting for 4 hours to obtain a mixture A;
s4, adding 1.5g of lauryl alcohol glycidyl ether into the mixture A, heating to 52 ℃, and reacting for 4 hours to obtain a mixture B;
and S5, cooling and filtering the mixture B, and drying at 55 ℃ to obtain the thickening agent.
The preparation method of the oil displacement agent comprises the following steps:
a1, adding 23 parts of thickening agent into 11000 parts of water, and stirring and swelling for 4 hours at 30 ℃ to prepare thickening agent solution.
And A2, adding 32 parts of fluorocarbon surfactant, 14 parts of diethylene glycol butyl ether and 17 parts of dodecyl primary amine into the thickener solution, and mixing to obtain the oil displacement agent.
Example 3
A preparation method of a multifunctional alkali-free viscoelastic thickener for improving recovery efficiency comprises the following steps:
s1, adding 10g of guanidine collagen powder into 50g of 95% ethanol solution for dispersion, adding 0.1g of sodium hydroxide, and stirring;
s2, heating to 46 ℃, and continuing stirring for 1h to obtain a mixed solution;
s3, adding 1.5g of resorcinol diglycidyl ether into the mixed solution, heating to 56 ℃, and reacting for 5 hours to obtain a mixture A;
s4, adding 2g of lauryl alcohol glycidyl ether into the mixture A, heating to 56 ℃, and reacting for 5 hours to obtain a mixture B;
and S5, cooling and filtering the mixture B, and drying at 62 ℃ to obtain the thickening agent.
The preparation method of the oil displacement agent comprises the following steps:
a1, adding 25 parts of thickening agent into 15000 parts of water, and stirring and swelling for 4 hours at 30 ℃ to prepare thickening agent solution.
And A2, adding 33 parts of fluorocarbon surfactant, 15 parts of diethylene glycol butyl ether and 20 parts of dodecyl primary amine into the thickener solution, and mixing to obtain the oil displacement agent.
Example 4
A preparation method of a multifunctional alkali-free viscoelastic thickener for improving recovery efficiency comprises the following steps:
s1, adding 10g of guanidine collagen powder into 50g of 95% ethanol solution for dispersion, adding 0.06g of sodium hydroxide, and stirring;
s2, heating to 45 ℃, and continuously stirring for 1h to obtain a mixed solution;
s3, adding 0.5g of resorcinol diglycidyl ether into the mixed solution, heating to 55 ℃, and reacting for 5 hours to obtain a mixture A;
s4, adding 2g of lauryl alcohol glycidyl ether into the mixture A, heating to 55 ℃, and reacting for 5 hours to obtain a mixture B;
and S5, cooling and filtering the mixture B, and drying at 60 ℃ to obtain the thickening agent.
The preparation method of the oil displacement agent comprises the following steps:
a1, adding 20 parts of thickening agent into 11000 parts of water, and stirring and swelling for 4 hours at 30 ℃ to obtain a thickening agent solution.
And A2, adding 30 parts of fluorocarbon surfactant, 10 parts of diethylene glycol butyl ether and 15 parts of dodecyl primary amine into the thickener solution, and mixing to obtain the oil displacement agent.
Comparative example 1
A preparation method of a multifunctional alkali-free viscoelastic thickener for improving recovery efficiency comprises the following steps:
s1, adding 10g of guanidine collagen powder into 50g of 95% ethanol solution for dispersion, adding 0.06g of sodium hydroxide, and stirring;
s2, heating to 45 ℃, and continuously stirring for 1h to obtain a mixed solution;
s3, adding 0.5g of resorcinol diglycidyl ether into the mixed solution, heating to 55 ℃, and reacting for 5 hours to obtain a mixture A;
and S4, cooling and filtering the mixture A, and drying at 60 ℃ to obtain the thickening agent.
The preparation method of the oil displacement agent comprises the following steps:
a1, adding 23 parts of thickening agent into 10000 parts of water, and stirring and swelling for 4 hours at 30 ℃ to prepare thickening agent solution.
And A2, adding 30 parts of fluorocarbon surfactant, 10 parts of diethylene glycol butyl ether and 15 parts of dodecyl primary amine into the thickener solution, and mixing to obtain the oil displacement agent.
Comparative example 2
A preparation method of a multifunctional alkali-free viscoelastic thickener for improving recovery efficiency comprises the following steps:
s1, adding 10g of guanidine collagen powder into 50g of 95% ethanol solution for dispersion, adding 0.06g of sodium hydroxide, and stirring;
s2, heating to 45 ℃, and continuously stirring for 1h to obtain a mixed solution;
s3, adding 2g of lauryl alcohol glycidyl ether into the mixed solution, heating to 55 ℃, and reacting for 5 hours to obtain a mixture A;
and S4, cooling and filtering the mixture A, and drying at 60 ℃ to obtain the thickening agent.
The preparation method of the oil displacement agent comprises the following steps:
a1, adding 23 parts of thickening agent into 10000 parts of water, and stirring and swelling for 4 hours at 30 ℃ to prepare thickening agent solution.
And A2, adding 30 parts of fluorocarbon surfactant, 10 parts of diethylene glycol butyl ether and 15 parts of dodecyl primary amine into the thickener solution, and mixing to obtain the oil displacement agent.
Comparative example 3
The preparation method of the oil displacement agent comprises the following steps:
a1, adding 23 parts of guanidine collagen powder into 10000 parts of water, and stirring and swelling for 4 hours at 30 ℃ to prepare a thickening agent solution.
And A2, adding 30 parts of fluorocarbon surfactant, 10 parts of diethylene glycol monobutyl ether and 15 parts of dodecyl primary amine into the thickening agent solution, and mixing to obtain the oil displacement agent.
Comparative example 4
A preparation method of a multifunctional alkali-free viscoelastic thickener for improving recovery efficiency comprises the following steps:
s1, adding 10g of guanidine collagen powder into 50g of 95% ethanol solution for dispersion, adding 0.06g of sodium hydroxide, and stirring;
s2, heating to 45 ℃, and continuously stirring for 1h to obtain a mixed solution;
s3, adding 2g of lauryl alcohol glycidyl ether into the mixed solution, heating to 55 ℃, and reacting for 5 hours to obtain a mixture A;
s4, adding 0.5g of resorcinol diglycidyl ether into the mixture A, heating to 55 ℃, and reacting for 5 hours to obtain a mixture B;
and S5, cooling and filtering the mixture B, and drying at 60 ℃ to obtain the thickening agent.
The preparation method of the oil displacement agent comprises the following steps:
a1, adding 23 parts of thickening agent into 10000 parts of water, and stirring and swelling for 4 hours at 30 ℃ to prepare thickening agent solution.
And A2, adding 30 parts of fluorocarbon surfactant, 10 parts of diethylene glycol butyl ether and 15 parts of dodecyl primary amine into the thickener solution, and mixing to obtain the oil displacement agent.
The temperature resistance and shear resistance of the oil displacement agents prepared in examples 1-4 and comparative examples 1-4 were measured, and the recovery ratio was calculated, and the measurement results are shown in table 1.
Viscosity: shear rate 511s at 30 ℃ using a six-speed viscometer -1 Measuring the viscosity of the thickener;
temperature resistance and shear resistance: adding the thickener to the rheometer at 210s -1 The temperature was raised to 180 ℃ at a shear rate, shearing was carried out, and the apparent viscosity at 60min was measured.
TABLE 1 measurement results
Compared with the example 1, the guanidine gum in the comparative example 1 is not modified by benzenediol diglycidyl ether, the guanidine gum in the comparative example 2 is not modified by lauryl alcohol glycidyl ether, and the guanidine gum in the comparative example 3 is not modified, so that the base fluid viscosity of the thickening agent and the temperature resistance, shear resistance and recovery ratio of the oil displacement agent obtained in the comparative examples 1-3 are lower than those of the example 1.
In comparative example 4, the guanidine gum is modified by lauryl alcohol glycidyl ether, and the viscosity of the base fluid, the temperature resistance and shear resistance of the oil displacement agent and the recovery ratio of the obtained thickening agent are lower than those of the thickening agent in example 1, which indicates that the base fluid obtained by modifying the guanidine gum by benzenediol diglycidyl ether and then adding the lauryl alcohol glycidyl ether is high in viscosity, and the oil displacement agent is good in temperature resistance and shear resistance and high in recovery ratio.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The multifunctional alkali-free viscoelastic thickener is characterized in that the thickener is obtained by modifying guanidine collagen powder with resorcinol diglycidyl ether and lauryl alcohol glycidyl ether.
2. The method of preparing a multifunctional non-alkaline viscoelastic thickener for enhanced oil recovery according to claim 1, comprising the steps of:
s1, adding guanidine collagen powder and sodium hydroxide into an ethanol solution and stirring;
s2, after the temperature is raised, continuously stirring to obtain a mixture A;
s3, adding resorcinol diglycidyl ether into the mixture A, and reacting to obtain a mixture B;
s4, adding lauryl alcohol glycidyl ether into the mixture B, and reacting to obtain a mixture C;
and S5, cooling, filtering and drying the mixture C to obtain the thickening agent.
3. The method of claim 2, wherein the mass ratio of guanidine collagen powder to ethanol in step S1 is 1:5.
4. The method for preparing the multifunctional non-alkali viscoelastic thickener for enhanced oil recovery according to claim 2, wherein the mass ratio of guanidine collagen powder to sodium hydroxide in the step S1 is 10.
5. The method for preparing a multifunctional non-alkali viscoelastic thickener for enhanced oil recovery according to claim 2, wherein the mass ratio of the resorcinol diglycidyl ether to the guanidine collagen powder in the step S3 is 0.5 to 1.5.
6. The method for preparing the multifunctional non-alkali viscoelastic thickener for enhanced oil recovery as claimed in claim 2, wherein the reaction temperature in the step S3 is 52-56 ℃ and the reaction time is 4-5 hours.
7. The method for preparing the multifunctional alkali-free viscoelastic thickener for enhanced oil recovery according to claim 2, wherein the mass ratio of lauryl alcohol glycidyl ether to guanidine collagen powder in the step S4 is 1.5 to 2.
8. The method for preparing the multifunctional non-alkali viscoelastic thickener for enhanced oil recovery according to claim 2, wherein the temperature is raised to 52-56 ℃ in the step S4, and the reaction time is 4-5 hours.
9. An enhanced oil recovery oil displacement agent comprising the thickener according to any one of claims 1 to 8.
10. The enhanced oil recovery oil displacement agent according to claim 9, which comprises the following components in parts by weight: 20-25 parts of thickening agent, 30-33 parts of fluorocarbon surfactant, 10-15 parts of diethylene glycol butyl ether, 10-20 parts of dodecyl primary amine and 10000-15000 parts of water.
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| CN111778007A (en) * | 2020-07-26 | 2020-10-16 | 青岛大学 | Preparation method of novel seawater-based interpenetrating network polymer gel oil displacement agent |
| CN112646048A (en) * | 2019-10-12 | 2021-04-13 | 中国石油化工股份有限公司 | Hydrophobic benzyl modified guar gum thickener and preparation method and application thereof |
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2022
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002114801A (en) * | 2000-07-31 | 2002-04-16 | Kao Corp | Method for producing polysaccharide derivative |
| CN105542027A (en) * | 2016-01-25 | 2016-05-04 | 江苏金和万方新材料科技有限公司 | Manufacturing method of rapid hydration guar gum |
| US20180128096A1 (en) * | 2016-11-07 | 2018-05-10 | Saudi Arabian Oil Company | Polymeric tracers |
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| JP2019099752A (en) * | 2017-12-06 | 2019-06-24 | 花王株式会社 | Polysaccharide derivative |
| CN112646048A (en) * | 2019-10-12 | 2021-04-13 | 中国石油化工股份有限公司 | Hydrophobic benzyl modified guar gum thickener and preparation method and application thereof |
| CN111778007A (en) * | 2020-07-26 | 2020-10-16 | 青岛大学 | Preparation method of novel seawater-based interpenetrating network polymer gel oil displacement agent |
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