CN115894789A - Viscoelastic particles with dynamic profile control and oil displacement performances and preparation method thereof - Google Patents
Viscoelastic particles with dynamic profile control and oil displacement performances and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of polymer synthesis, and particularly relates to viscoelastic particles with dynamic profile control and oil displacement performances and a preparation method thereof. The acrylamide monomer is acrylamide or methacrylamide, and the functional monomer is the combination of N, N-dimethylaminoethyl methacrylate, an AMPS monomer and methylene bisacrylamide or the combination of N, N-dimethylaminoethyl methacrylate, an AMPS monomer and methylene acrylamide. The product has a molecular structure of cross-linking, branching, linearity and large side groups, has double functions of 'blocking' and 'driving', can dynamically adjust pores according to heterogeneous oil reservoirs, expands the waves and coefficients of the displacement fluid through effective blocking and migration due to certain viscosity, improves the waves and conditions of the displacement fluid and improves the recovery ratio.
Description
Technical Field
The invention belongs to the technical field of polymer synthesis, and particularly relates to viscoelastic particles with dynamic profile control and oil displacement performances and a preparation method thereof.
Background
At present, the tertiary oil recovery polyacrylamide oil displacement agent has channeling along a high permeability zone in a heterogeneous oil reservoir, so that the sweep efficiency is inconsistent, and the effect of uniformly improving the recovery ratio cannot be achieved. In order to improve and enhance the oil displacement efficiency, the technology of expanding the displacement sweep coefficient by plugging water and adjusting the stratum section is the most effective technology. The conventional water shutoff profile control granular gel has poor deformation and incapability of migration due to high crosslinking density and good dimensional stability, is short in injection amount and effective action distance and is generally limited to a near-wellbore area of about 10m around a wellbore, and only the water absorption profile near the wellbore is improved in profile control. As the amount of subsequent water injected increases, the heterogeneity of the reservoir will cause the injected water to bypass the plugging layer and quickly blow along the high permeability layer into the production well.
The oil field proposes colloidal dispersion gel, which is micelle gel solution with polymer molecule formed with intramolecular cross-linking as main part and several intermolecular cross-linking as supplementary part under the action of cross-linking agent. The gel water plugging agent has the technical characteristics of deep profile control and oil reservoir internal fluid mobility redirection, but has the influences of factors such as difficult polymer cross-linking matching, mineralized water, temperature, injection shearing and the like, the dispersed gel is irregular, and meanwhile, partial bonds among gel coils are broken under the drive of underground subsequent fluid, so that the water plugging effect is reduced, and the use conditions are limited.
Disclosure of Invention
In order to solve the problems of strong heterogeneity of an oil reservoir, difficult exploitation of residual oil, poor shape denaturation of conventional water plugging gel particles, short effective acting distance and the like, the invention aims to provide viscoelastic particles with dynamic profile control and oil displacement performances and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: a viscoelastic particle with dynamic profile control and oil displacement performances has the following molecular structure:
in the formula, m accounts for 80-90%, n accounts for 5-10%, L accounts for 4-10%, and P accounts for 0.1-0.5%.
The viscoelastic particles are prepared by copolymerizing acrylamide monomers and functional monomers in an aqueous solution through a free radical redox initiation system, granulating, drying and grinding into particles with different particle sizes after polymerization.
Further, the acrylamide monomer is acrylamide or methacrylamide, and the functional monomer is a combination of N, N-dimethylaminoethyl methacrylate, an AMPS monomer and methylene bisacrylamide or a combination of N, N-dimethylaminoethyl methacrylate, an AMPS monomer and methylene acrylamide.
The preparation method of the viscoelastic particles with dynamic profile control and oil displacement performances comprises the following steps:
1) Adding 760-800 parts of pure water into a 1000mL beaker, adding 180-200 parts of acrylamide monomer, stirring to completely dissolve, adding 10-20 parts of AMPS functional monomer (liquid in percent), stirring to completely dissolve, adjusting the pH value of the solution to 7-8.0 by using sodium hydroxide, adding 10-20 parts of N, N-dimethylaminoethyl methacrylate functional monomer (in percent), stirring to completely dissolve, finally adding 0.2-1 part of methylene bisacrylamide or methylene acrylamide functional monomer, stirring to completely dissolve, adding 0.01-0.1 part of sodium formate and 0.5-1.0 part of triethanolamine after blowing nitrogen to deoxidize for 20min at the temperature of 0-2 ℃, adding 0.005-0.03 part of potassium persulfate after blowing nitrogen to deoxidize for 40min, adding 0.003-0.02 part of sodium bisulfite after continuously deoxidizing for 10min, introducing nitrogen until the solution becomes viscous, and sealing;
2) After the solution is sealed, the temperature of the solution is raised to the maximum value and naturally cooled for 2 hours, the colloid is taken out and granulated into particles of 2-3mm, the particles are dried at 65 ℃, and after the drying is finished, the particles with different meshes are ground and sieved to obtain the finished product.
In order to realize dynamic depth profile control, enlarge the polymer injection wave sum coefficient and have oil displacement performance, the invention synthesizes the polyacrylamide dynamic dispersion gel viscoelastic particles, the product has a molecular structure of cross-linking-branching-linearity and large side groups, and the influence of adverse factors such as poor cross-linking matching property, salt resistance, injection shearing viscosity reduction and the like of colloidal dispersion gel is solved on the performance.
The viscoelastic particles have dual functions of 'blocking' and 'driving', pores can be dynamically adjusted according to heterogeneous oil reservoirs, and due to certain viscosity, the wave and coefficient of the displacement fluid are enlarged through effective blocking and migration, the wave and condition of the displacement fluid are improved, and areas which cannot be reached by the previous wave are fully displaced, so that the overall wave and volume are improved, and the purpose of improving the recovery ratio is achieved. The grain diameters of different specifications can meet the requirements of plugging and adjusting oil reservoir pores of different blocks. And the subsequent coordination injection of the poly surfactant containing a certain number of alkyl groups makes the displacement effect of the residual crude oil more obvious.
The invention has the following beneficial effects:
(1) Two functional monomers of N, N-dimethylaminoethyl methacrylate and methylene bisacrylamide are introduced, and a special molecular structure integrating a self-crosslinking-branching-linear structure is formed through intermolecular crosslinking, so that the modified acrylic acid has the shear resistance.
(2) The AMPS is introduced to further improve the salt resistance of the viscoelastic particles through the salt tolerance sensitivity of sulfonic groups, the temperature resistance of the viscoelastic particles is greatly improved due to the fact that the viscoelastic particles have a branched and cross-linked structure, and the salt resistance can reach 20000mg/L.
(3) The products are ground into different particle sizes, and the products with different particle sizes are adapted according to the heterogeneity of the oil reservoir, so that the requirements of blocking and driving different oil reservoir pores can be met.
(4) The technical result of the invention solves the problem that colloidal dispersion gel is poor in crosslinking matching property, salt-free and influenced by adverse factors such as injection, shearing and viscosity reduction, the special structure of the viscoelastic particles improves the swept condition of the displacement fluid, and areas which cannot be swept before are fully displaced, so that the overall swept volume is increased, and the aim of increasing the recovery ratio is fulfilled.
Detailed Description
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the scope of the present invention is not limited to these examples. All changes, modifications and equivalents that do not depart from the spirit of the invention are intended to be included within the scope thereof.
The experimental drugs used in the present invention are as follows: acrylamide crystals (refined) or purified aqueous solutions, methacrylamide, AMPS functional monomers (high purity) (shandong shouguang); n, N-dimethylaminoethyl methacrylate (shandong junan); methylene bisacrylamide or methylene acrylamide (shandong junan); sodium hydroxide (bigemination); sodium formate (analytically pure); triethanolamine (analytical grade); potassium persulfate (analytical grade); sodium bisulfite (analytical grade).
Example 1
(1) The preparation method of the viscoelastic particles comprises the following steps:
the first step, the raw materials by weight part 1000 are: 180 parts of refined acrylamide monomer AM, 20 parts of AMPS functional monomer, 10 parts of methacrylic acid N, N-dimethylaminoethyl ester functional monomer, 0.5 part of methylene bisacrylamide functional monomer and the balance of pure water.
In the first step, 789 parts of pure water is added into a 1000mL beaker, 180 parts of acrylamide crystals are added and stirred to be completely dissolved (or an aqueous solution obtained after acrylamide purification is added), 20 parts of AMPS functional monomer (in liquid in hundred) are added and stirred to be completely dissolved, the pH value of the solution is adjusted by sodium hydroxide, 10 parts of N, N-dimethylaminoethyl methacrylate functional monomer (in hundred) are added and stirred to be completely dissolved, finally 0.5 part of methylene bisacrylamide functional monomer is added and stirred to be completely dissolved, 0.05 part of sodium formate and 0.6 part of triethanolamine are added after 20min of oxygen removal by nitrogen blowing at the temperature of 0-2 ℃, and potassium persulfate is added after 40min of oxygen removal by nitrogen blowing: 0.01 portion, continuously deoxidizing for 10min, then adding 0.006 portion of sodium bisulfite, introducing nitrogen until the solution becomes viscous, and sealing.
And step two, after the solution is sealed, taking out the colloid for granulation into 2-3mm particles after the temperature of the solution is raised to the maximum value and naturally cooled for 2 hours, drying at 65 ℃, and grinding and screening into particles with the number of 60-100 meshes after the drying is finished to obtain the finished product.
(2) Sample evaluation
Method for measuring viscosity of aqueous dispersion: samples were prepared with simulated formation water having a degree of mineralization of 18500mg/L to a solution concentration of 5000mg/L and the viscosity was measured at 85 degrees using a Brookfield DV3 type viscometer.
Method for measuring shear resistance: a sample is prepared into a solution with the concentration of 3500mg/L by using simulated formation water with the mineralization degree of 18500mg/L, and after shearing the solution for 20s by using a Wu Yin stirrer (3500 r/min), the viscosity before and after shearing is measured by using a Brookfield DV3 type viscometer, and the viscosity retention rate is calculated.
Elastic modulus of aqueous dispersion: the detection is carried out according to the method in the standard Q/SH 10202374-2020.
The method for measuring the plugging rate comprises the following steps: the test was carried out by the method described in the standard Q/12DGY 3833-2017.
The oil displacement efficiency determination method comprises the following steps: preparing a solution with the concentration of 5000mg/L by using simulated formation water with the mineralization degree of 20000mg/L, injecting 0.2PV by adopting water injection, then injecting a section type injection of 0.3PV by adopting viscoelastic particles, and evaluating the oil displacement efficiency by using a physical model tester. Compared with the conventional crosslinking gel system, all indexes are obviously improved. The evaluation results are shown in Table 1 below.
Table 1 example 1 sample performance evaluation table
Example 2
(1) The preparation method of the viscoelastic particles comprises the following steps:
the first step, the raw materials by weight part 1000 are: 180 parts of methacrylamide AM, 20 parts of AMPS functional monomer, 20 parts of methacrylic acid N, N-dimethylaminoethyl ester functional monomer, 0.3 part of methylene acrylamide functional monomer and the balance of pure water.
In the first step, 789 parts of pure water is added into a 1000mL beaker, 180 parts of methacrylamide is added and stirred to be completely dissolved, 20 parts of AMPS functional monomer (folded liquid) are added and stirred to be completely dissolved, the pH value of the solution is adjusted to 7 by sodium hydroxide, 20 parts of N, N-dimethylaminoethyl methacrylate functional monomer (folded liquid) are added and stirred to be completely dissolved, finally 0.3 part of methylene acrylamide functional monomer is added and stirred to be completely dissolved, at the temperature of 0-2 ℃, 0.05 part of sodium formate and 0.6 part of triethanolamine are added after oxygen is removed by blowing nitrogen for 20min, and potassium persulfate is added after oxygen is removed by blowing nitrogen for 40 min: 0.05 portion, continuing deoxidizing for 10min, then adding 0.02 portion of sodium bisulfite, introducing nitrogen until the solution becomes viscous, and then sealing.
And step two, after the solution is sealed, taking out the colloid for granulation into 2-3mm particles after the temperature of the solution is raised to the maximum value and naturally cooled for 2 hours, drying at 65 ℃, and grinding and screening into particles with the number of 60-100 meshes after the drying is finished to obtain the finished product.
(3) Sample evaluation
Method for measuring viscosity of aqueous dispersion: the samples were prepared with 18500mg/L simulated formation water to a 5000mg/L concentration solution and the viscosity was measured at 85 degrees using a Brookfield DV3 viscometer.
Method for measuring shear resistance: a sample is prepared into a solution with the concentration of 3500mg/L by using simulated formation water with the mineralization degree of 18500mg/L, and after shearing the solution for 20s by using a Wu Yin stirrer (3500 r/min), the viscosity before and after shearing is measured by using a Brookfield DV3 type viscometer, and the viscosity retention rate is calculated.
Elastic modulus of aqueous dispersion: the detection is carried out according to the method in the standard Q/SH 10202374-2020.
The method for measuring the plugging rate comprises the following steps: the test was carried out by the method described in the standard Q/12DGY 3833-2017.
The oil displacement efficiency determination method comprises the following steps: preparing a solution with the concentration of 5000mg/L by using simulated formation water with the mineralization degree of 20000mg/L, injecting 0.2PV by adopting water injection, then injecting a section type injection of 0.3PV by adopting viscoelastic particles, and evaluating the oil displacement efficiency by using a physical model tester. Compared with the conventional crosslinking gel system, all indexes are obviously improved. The evaluation results are shown in Table 2 below.
Table 2 example 2 sample performance evaluation table
Example 3
(1) The preparation method of the viscoelastic particles comprises the following steps:
the first step, the raw materials by weight part 1000 are: 180 parts of refined acrylamide monomer AM, 15 parts of AMPS functional monomer, 15 parts of methacrylic acid N, N-dimethylaminoethyl ester functional monomer, 0.4 part of methylene bisacrylamide functional monomer and the balance of pure water.
In the first step, 789 parts of pure water is added into a 1000mL beaker, 180 parts of acrylamide crystals are added and stirred to be completely dissolved (or an aqueous solution obtained after acrylamide purification is added), 15 parts of AMPS functional monomer (liquid in percent) is added and stirred to be completely dissolved, the pH value of the solution is adjusted by sodium hydroxide to be 7, 15 parts of N, N-dimethylaminoethyl methacrylate functional monomer (liquid in percent) is added and stirred to be completely dissolved, finally 0.2 part of methylene bisacrylamide functional monomer is added and stirred to be completely dissolved, 0.1 part of sodium formate and 0.6 part of triethanolamine are added after nitrogen blowing is performed for 20min at the temperature of 0-2 ℃, and potassium persulfate is added after nitrogen blowing is performed for 40 min: 0.05 portion, continuing deoxidizing for 10min, then adding 0.02 portion of sodium bisulfite, introducing nitrogen until the solution becomes viscous, and then sealing.
And step two, after the solution is sealed, taking out the colloid for granulation into 2-3mm particles after the temperature of the solution is raised to the maximum value and naturally cooled for 2 hours, drying at 65 ℃, and grinding and screening into particles with the number of 60-10 meshes after the drying is finished to obtain the finished product.
(4) Sample evaluation
Method for measuring viscosity of aqueous dispersion: samples were prepared with simulated formation water having a degree of mineralization of 18500mg/L to a solution concentration of 5000mg/L and the viscosity was measured at 85 degrees using a Brookfield DV3 type viscometer.
Method for measuring shear resistance: samples were prepared into 3500mg/L solutions using 18500mg/L simulated formation water, and after shearing for 20 seconds with a Wu Yin stirrer (3500 r/min), viscosity was measured before and after shearing with a Brookfield DV3 type viscometer, and viscosity retention was calculated.
Elastic modulus of aqueous dispersion: the detection is carried out according to the method in the standard Q/SH 10202374-2020.
The method for measuring the plugging rate comprises the following steps: the detection is carried out according to the method in the standard Q/12DGY 3833-2017.
The oil displacement efficiency determination method comprises the following steps: preparing a solution with the concentration of 5000mg/L by using simulated formation water with the mineralization degree of 20000mg/L, injecting 0.2PV by adopting water injection, then injecting a section type injection of 0.3PV by adopting viscoelastic particles, and evaluating the oil displacement efficiency by using a physical model tester. Compared with the conventional crosslinking gel system, all indexes are obviously improved. The evaluation results are shown in Table 3 below.
Table 3 example 3 sample performance evaluation table
Example 4
(1) The preparation method of the viscoelastic particles comprises the following steps:
the first step, the raw materials by weight part 1000 are: 200 parts of methacrylamide AM, 10 parts of AMPS functional monomer, 20 parts of methacrylic acid N, N-dimethylaminoethyl ester functional monomer, 1.0 part of methylene bisacrylamide functional monomer and the balance of pure water.
In the first step, 769 parts of pure water is added into a 1000mL beaker, 200 parts of methacrylamide is added and stirred to be completely dissolved, 10 parts of AMPS functional monomer (liquid in percent) is added and stirred to be completely dissolved, the pH value of the solution is adjusted to be 8 by sodium hydroxide, 20 parts of N, N-dimethylaminoethyl methacrylate functional monomer (in percent) is added and stirred to be completely dissolved, finally 1.0 part of methylene bisacrylamide functional monomer is added and stirred to be completely dissolved, at the temperature of 0-2 ℃, 0.1 part of sodium formate and 0.6 part of triethanolamine are added after nitrogen blowing is performed for deoxygenation for 20min, and potassium persulfate is added after nitrogen blowing is performed for deoxygenation for 40 min: 0.05 portion, continuously deoxidizing for 10min, then adding 0.02 portion of sodium bisulfite, introducing nitrogen until the solution becomes viscous, and then sealing.
And step two, after the solution is sealed, taking out the colloid for granulation into 2-3mm particles after the temperature of the solution is raised to the maximum value and naturally cooled for 2 hours, drying at 65 ℃, and grinding and screening into particles with the number of 60-100 meshes after the drying is finished to obtain the finished product.
(5) Sample evaluation
Method for measuring viscosity of aqueous dispersion: samples were prepared with simulated formation water having a degree of mineralization of 18500mg/L to a solution concentration of 5000mg/L and the viscosity was measured at 85 degrees using a Brookfield DV3 type viscometer.
Method for measuring shear resistance: samples were prepared into 3500mg/L solutions using 18500mg/L simulated formation water, and after shearing for 20 seconds with a Wu Yin stirrer (3500 r/min), viscosity was measured before and after shearing with a Brookfield DV3 type viscometer, and viscosity retention was calculated.
Elastic modulus of aqueous dispersion: the detection is carried out according to the method in the standard Q/SH 10202374-2020.
The method for measuring the plugging rate comprises the following steps: the test was carried out by the method described in the standard Q/12DGY 3833-2017.
The oil displacement efficiency determination method comprises the following steps: preparing a solution with the concentration of 5000mg/L by using simulated formation water with the mineralization degree of 20000mg/L, injecting 0.2PV by adopting water injection, then injecting a section type injection of 0.3PV by adopting viscoelastic particles, and evaluating the oil displacement efficiency by using a physical model tester. Compared with the conventional crosslinking gel system, all indexes are obviously improved. The evaluation results are shown in Table 4 below.
Table 4 example 4 sample performance evaluation table
Example 5
(1) The preparation method of the viscoelastic particles comprises the following steps:
the first step, the raw materials by weight part 1000 are: 200 parts of refined acrylamide monomer AM, 20 parts of AMPS functional monomer, 10 parts of methacrylic acid N, N-dimethylaminoethyl ester functional monomer, 0.3 part of methylene acrylamide functional monomer and the balance of pure water.
In the first step, 769 parts of pure water is added into a 1000mL beaker, 200 parts of acrylamide crystals are added, stirred and dissolved completely (or an aqueous solution obtained after acrylamide purification is added), 20 parts of AMPS functional monomer (in a hundred parts of liquid) are added, stirred and dissolved completely, the pH value of the solution is adjusted by sodium hydroxide to be 8, 10 parts of N, N-dimethylaminoethyl methacrylate functional monomer (in a hundred parts) are added, stirred and dissolved completely, finally 0.3 part of methylene acrylamide functional monomer is added, stirred and dissolved completely, at the temperature of 0-2 ℃, 0.1 part of sodium formate and 0.6 part of triethanolamine are added after nitrogen blowing is carried out for 20min, and potassium persulfate is added after nitrogen blowing is carried out for 40 min: 0.05 portion, continuously deoxidizing for 10min, then adding 0.02 portion of sodium bisulfite, introducing nitrogen until the solution becomes viscous, and then sealing.
And step two, after the solution is sealed, taking out the colloid for granulation into 2-3mm particles after the temperature of the solution is raised to the maximum value and naturally cooled for 2 hours, drying at 65 ℃, and grinding and screening the particles into 60-100 meshes of particles after the drying is finished to obtain the finished product.
(6) Sample evaluation
The viscosity measurement method comprises the following steps: the samples were prepared with simulated formation water having a degree of mineralization of 18500mg/L to a solution concentration of 3500mg/L and the viscosity was measured with a Brookfield DV3 type viscometer.
Method for measuring shear resistance: a sample is prepared into a solution with the concentration of 3500mg/L by using simulated formation water with the mineralization degree of 18500mg/L, and after shearing the solution for 20s by using a Wu Yin stirrer (3500 r/min), the viscosity before and after shearing is measured by using a Brookfield DV3 type viscometer, and the viscosity retention rate is calculated.
Elastic modulus of aqueous dispersion: the detection is carried out according to the method in the standard Q/SH 10202374-2020.
The method for measuring the plugging rate comprises the following steps: the test was carried out by the method described in the standard Q/12DGY 3833-2017.
The oil displacement efficiency determination method comprises the following steps: preparing a solution with the concentration of 3000mg/L by using simulated formation water with the mineralization degree of 18500mg/L, injecting 0.2PV by adopting water injection, then injecting a slug type injection of 0.3PV by adopting viscoelastic particles, and evaluating the oil displacement efficiency by using a physical model tester. Compared with the conventional crosslinking gel system, all indexes are obviously improved. The evaluation results are shown in Table 5 below.
Table 5 example 5 sample performance evaluation table
Example 6
(1) The preparation method of the viscoelastic particles comprises the following steps:
the first step, the raw materials by weight part 1000 are: 200 parts of methacrylamide AM, 15 parts of AMPS functional monomer, 15 parts of methacrylic acid N, N-dimethylaminoethyl ester functional monomer, 0.8 part of methylene bisacrylamide functional monomer and the balance of pure water.
In the first step, 769 parts of pure water is added into a 1000mL beaker, 200 parts of methacrylamide is added and stirred to be completely dissolved, 15 parts of AMPS functional monomer (folded liquid) are added and stirred to be completely dissolved, the pH value of the solution is adjusted to be 8 by sodium hydroxide, 15 parts of N, N-dimethylaminoethyl methacrylate functional monomer (folded liquid) are added and stirred to be completely dissolved, finally 0.8 part of methylene bisacrylamide functional monomer is added and stirred to be completely dissolved, at the temperature of 0-2 ℃, 0.1 part of sodium formate and 0.6 part of triethanolamine are added after nitrogen blowing is performed for deoxidization for 20min, and potassium persulfate is added after nitrogen blowing is performed for deoxidization for 40 min: 0.05 portion, continuing deoxidizing for 10min, then adding 0.02 portion of sodium bisulfite, introducing nitrogen until the solution becomes viscous, and then sealing.
And step two, after the solution is sealed, taking out the colloid for granulation into 2-3mm particles after the temperature of the solution is raised to the maximum value and naturally cooled for 2 hours, drying at 65 ℃, and grinding and screening into particles with different meshes after drying to obtain the finished product.
(7) Sample evaluation
The viscosity measurement method comprises the following steps: the samples were prepared with simulated formation water having a mineralization of 18500mg/L to a solution concentration of 3500mg/L and the viscosity was measured using a Brookfield DV3 type viscometer.
Method for measuring shear resistance: samples were prepared into 3500mg/L solutions using 18500mg/L simulated formation water, and after shearing for 20 seconds with a Wu Yin stirrer (3500 r/min), viscosity was measured before and after shearing with a Brookfield DV3 type viscometer, and viscosity retention was calculated.
Elastic modulus of aqueous dispersion: the detection is carried out according to the method in the standard Q/SH 10202374-2020.
The method for measuring the plugging rate comprises the following steps: the test was carried out by the method described in the standard Q/12DGY 3833-2017.
The oil displacement efficiency determination method comprises the following steps: preparing a solution with the concentration of 3000mg/L by using simulated formation water with the mineralization degree of 18500mg/L, injecting 0.2PV by adopting water injection, then injecting a slug type injection of 0.3PV by adopting viscoelastic particles, and evaluating the oil displacement efficiency by using a physical model tester. Compared with the conventional crosslinking gel system, all indexes are obviously improved. The evaluation results are shown in Table 6 below.
Table 6 table for evaluating properties of samples of example 6
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (3)
1. The viscoelastic particles with dynamic profile control and oil displacement performances are characterized in that the molecular structure is as follows:
in the formula, m accounts for 80-90%, n accounts for 5-10%, L accounts for 4-10%, and P accounts for 0.1-0.5%;
the viscoelastic particles are prepared by copolymerizing acrylamide monomers and functional monomers in an aqueous solution through a free radical redox initiation system, granulating, drying and grinding into particles with different particle sizes after polymerization.
2. The viscoelastic particle for both dynamic profile control and oil displacement of claim 1, wherein the acrylamide-based monomer is acrylamide or methacrylamide, and the functional monomer is N, N-dimethylaminoethyl methacrylate, AMPS monomer, methylene bisacrylamide in combination or N, N-dimethylaminoethyl methacrylate, AMPS monomer, methylene acrylamide in combination.
3. The preparation method of the viscoelastic particles with the dynamic profile control and oil displacement performances as claimed in claim 1 or 2, is characterized by comprising the following steps:
1) Adding 760-800 parts of pure water into a 1000mL beaker, adding 180-200 parts of acrylamide monomer, stirring to completely dissolve, adding 10-20 parts of AMPS functional monomer (liquid in percent), stirring to completely dissolve, adjusting the pH value of the solution to 7-8.0 by using sodium hydroxide, adding 10-20 parts of N, N-dimethylaminoethyl methacrylate functional monomer (in percent), stirring to completely dissolve, finally adding 0.2-1 part of methylene bisacrylamide or methylene acrylamide functional monomer, stirring to completely dissolve, adding 0.01-0.1 part of sodium formate and 0.5-1.0 part of triethanolamine after blowing nitrogen to deoxidize for 20min at the temperature of 0-2 ℃, adding 0.005-0.03 part of potassium persulfate after blowing nitrogen to deoxidize for 40min, adding 0.003-0.02 part of sodium bisulfite after continuously deoxidizing for 10min, introducing nitrogen until the solution becomes viscous, and sealing;
2) After the solution is sealed, the temperature of the solution is raised to the maximum value and naturally cooled for 2 hours, the colloid is taken out and granulated into particles of 2-3mm, the particles are dried at 65 ℃, and after the drying is finished, the particles with different meshes are ground and sieved to obtain the finished product.
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| CN105482035A (en) * | 2014-09-19 | 2016-04-13 | 中国石油化工股份有限公司 | Polyacrylamide, and preparation method and application thereof |
| CN105153363A (en) * | 2015-08-07 | 2015-12-16 | 中国石油化工股份有限公司胜利油田分公司勘探开发研究院 | Partially-crosslinked and partially-branched copolymer oil displacement agent and preparation method thereof |
| CN106220781A (en) * | 2016-07-21 | 2016-12-14 | 西安长庆化工集团有限公司 | A kind of profile control polymer microballoon and preparation method thereof |
| WO2019183390A1 (en) * | 2018-03-22 | 2019-09-26 | Kemira Oyj | Preformed particle gel for enhanced oil recovery |
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| CN116063624A (en) * | 2023-01-12 | 2023-05-05 | 东营聚源石油科技有限公司 | Delay tackifying temperature-resistant salt-resistant polymer for oil displacement and preparation method thereof |
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