CO2 trapping and channeling prevention integrated functional polymer and preparation method thereof
By preparing a CO2 capture and anti-trap integration functional polymer, the problem of poor acid resistance and inability to form glue in the prior art is solved, efficient CO2 capture and anti-trap effect is achieved, and CO2 oil displacement efficiency is improved.
Patent Information
- Application Number
- CN202411525853.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-03-11
AI Technical Summary
During the CO2 oil flooding process, the existing polymer anti-serial system has poor acid resistance and complex formation environment, resulting in the polymer solution being unable to form glue, which makes the anti-serial effect worse.
A method of preparing a CO2 capture and anti-trap integration functional polymer is adopted. By dissolving acrylamide, acrylic acid, hydrophobic monomer and functional monomer with CO2 response in water, adjusting the pH to 7-8, and controlling the solution temperature to no more than 20℃, adding a water-soluble initiator system after nitrogen removal and oxygenation. After the initiator is added, the solution thickens rapidly, and the reaction system is closed for adiabatic reaction, obtaining a polymer with CO2 capture and anti-trap functions.
The polymer is dissolved in water to form a solution of a certain viscosity, and gels after being introduced into CO2 gas, which greatly improves the viscosity, significantly improves the gas anti-sert performance, improves the CO2 oil-driving efficiency, and can capture a large amount of CO2 gas.
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Figure CN119591781A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of petroleum industry, and in particular to a CO2 capture and anti-channeling integrated functional polymer and a preparation method thereof. Background Art
[0002] As water injection development continues to deepen, the comprehensive water content increases, and the number of high-water-content oil wells increases, showing the characteristics of low recovery, low resource utilization, and low development benefits. Carbon dioxide flooding can not only significantly increase crude oil recovery, but also solve geological storage problems, protect the atmospheric environment, and inhibit the greenhouse effect, and has broad application prospects. However, gas cross-talk is prone to occur during CO2 flooding, and the existing polymer anti-cross-talk system has poor acid resistance. At the same time, due to the complex formation environment, the polymer solution cannot gel, which makes its anti-cross-talk effect worse. Summary of the invention
[0003] In order to solve the above technical problems, the present invention provides a CO2 capture and anti-channeling integrated functional polymer and a preparation method.
[0004] In a first aspect, the present invention provides a method for preparing a CO2 capture and anti-crossing integrated functional polymer, which is achieved by adopting the following technical scheme.
[0005] A method for preparing a CO2 capture and anti-channeling integrated functional polymer comprises the following steps:
[0006] S1. dissolving acrylamide, acrylic acid, a hydrophobic monomer and a functional monomer having a CO2 response in water, and adjusting the pH to 7-8;
[0007] S2. The solution temperature is controlled not to exceed 20°C, and a water-soluble initiator system is added after nitrogen is passed to remove oxygen. After the initiator is added, the solution quickly thickens, and the reaction system is closed for an adiabatic reaction. After the adiabatic reaction reaches the highest temperature, it is kept warm for 2-3 hours to obtain a CO2 capture and anti-channeling integrated functional polymer.
[0008] Furthermore, the total monomer mass fraction of acrylamide, acrylic acid, hydrophobic monomer and CO2 responsive functional monomer is 20-30wt%, and the rest is water.
[0009] Furthermore, the mass ratio of acrylamide, acrylic acid, hydrophobic monomer and CO2-responsive functional monomer is (12-17):4.6:0.5:(2-9).
[0010] Furthermore, the hydrophobic monomer is N,N-diallyldodecylamine.
[0011] Furthermore, the CO2-responsive functional monomer is selected from one or a combination of N,N-dimethylacrylamide, diethylaminoethyl methacrylate, N-isopropylacrylamide, dimethylaminopropyl propionamide, and long-chain alkyl tertiary amines containing double bonds. Specifically, the long-chain alkyl tertiary amines containing double bonds are selected from oleamidopropyl dimethylamine and erucamidopropyl dimethylamine.
[0012] Furthermore, the water-soluble initiator system accounts for 0.0004%-0.01% of the total mass of the reaction system; the water-soluble initiator system includes an azo initiator, an oxidant, a reductant and an initiation aid, and the mass of the azo initiator, the oxidant, the reductant and the initiation aid is (1-3):(0.02-0.1):(0.01-0.05):(0.005-0.03).
[0013] Furthermore, the water-soluble initiator system is selected from a combination of potassium persulfate, ammonium persulfate, sodium bisulfite, sodium persulfate, bleaching agent, ammonium ferrous sulfate, azobisisobutylamidine hydrochloride, azobisisobutylimidazoline hydrochloride, and azobisisobutylamidine hydrochloride.
[0014] Furthermore, in step S2, the solution temperature is controlled to be 15°C.
[0015] Furthermore, in step S2, the polymerized rubber block is sheared into 3-5 mm rubber particles, dried at 60-70° C. for 1-2 hours, and then ground into a dry powder product.
[0016] In a second aspect, the present invention provides a CO2 capture and anti-crossing integrated functional polymer, which is achieved by adopting the following technical solution.
[0017] A CO2 capture and anti-crossing integrated functional polymer prepared by the above preparation method.
[0018] The present invention achieves the following beneficial effects.
[0019] The CO2 capture and anti-crosslinking integrated functional polymer synthesized by the present invention is dissolved in water to form a solution of a certain viscosity, and then CO2 gas is introduced into the solution. Due to the effect of the responsive functional monomer, there is no need to add a crosslinking agent, and the polymer solution is gelled and the viscosity is greatly increased, thereby improving the gas anti-crosslinking performance of the system and the CO2 oil recovery efficiency. At the same time, the polymer gelation process can also capture a large amount of CO2 gas, thereby playing a role in capturing CO2 gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a graph showing the viscosity change of a 1500 mg / L CO2 responsive polymer solution before and after CO2 response prepared in Example 5 of the present invention;
[0021] Figure 2This is a graph showing the viscosity change of the 3000 mg / L CO2 responsive polymer solution prepared in Example 5 of the present invention before and after the CO2 response. DETAILED DESCRIPTION
[0022] The technical solution of the present invention will be clearly and completely described below through specific implementation methods.
[0023] The N,N-diallyl dodecylamine used in this example is self-made. For the specific preparation method, please refer to "Geng Tongmou. Synthesis of monomer N,N-diallyl dodecylamine and properties of its hydrophobically associating water-soluble polymer [J]. Applied Chemical Industry, 2011, 40(9): 4.";
[0024] The CAS NO. of dimethylaminopropyl propionamide used in this example is 3845-76-9;
[0025] The N-isopropylacrylamide CAS NO. used in this example is: 2210-25-5;
[0026] The diethylaminoethyl methacrylate used in this example is CAS No.: 105-16-8;
[0027] The oleamidopropyl dimethylamine used in this example is CAS No.: 109-28-4.
[0028] Example 1
[0029] A method for preparing a CO2 capture and anti-channeling integrated functional polymer comprises the following steps:
[0030] Add 1000g of deionized water to a 2L beaker, then add 254g of AM monomer, 36g of dimethylaminopropyl propionamide monomer, 70g of acrylic acid, and 7.5g of N,N-diallyl dodecylamine, stir evenly, then adjust the pH to 8 and add deionized water to the system to 1500g, cool the solution to 15°C with an ice bath, transfer the solution to a Dewar flask, pass high-purity nitrogen for 30 minutes, then begin to add 0.15g of azobisisobutylimidazoline hydrochloride initiator, 0.03g of sodium persulfate, 0.015g of sodium bisulfite, and 0.007g of ammonium ferrous sulfate to the solution, then continue to pass nitrogen until the solution becomes viscous and then seal.
[0031] After the adiabatic reaction temperature reaches the highest point, it is kept warm for 2 hours, the colloid is taken out from the Dewar flask, the colloid block is cut into 2-3 mm colloid particles, placed in a 70°C oven for drying for 2 hours, and then ground into a dry powder product.
[0032] Example 2
[0033] A method for preparing a CO2 capture and anti-channeling integrated functional polymer comprises the following steps:
[0034] Add 1000g of distilled water to a 2L beaker, then add 236g of AM monomer, 54g of dimethylaminopropyl propionamide monomer, 70g of acrylic acid, and 7.5g of N,N-diallyl dodecylamine, stir evenly, then adjust the pH to 8 and add deionized water to the system to 1500g, cool the solution to 15°C with an ice bath, transfer the solution to a Dewar flask, pass high-purity nitrogen for 30 minutes, then start adding 0.15g of azobisisobutylimidazoline hydrochloride initiator, 0.03g of potassium persulfate, 0.015g of sodium bisulfite, and 0.007g of bleaching powder to the solution, then continue to pass nitrogen until the solution becomes viscous and seal it.
[0035] After the adiabatic reaction temperature reaches the highest point, it is kept warm for 2 hours, the colloid is taken out from the Dewar flask, the colloid block is cut into 2-3 mm colloid particles, placed in a 70°C oven for drying for 2 hours, and then ground into a dry powder product.
[0036] Example 3
[0037] A method for preparing a CO2 capture and anti-channeling integrated functional polymer comprises the following steps:
[0038] Add 1000g of distilled water to a 2L beaker, then add 218g of AM monomer, 72g of dimethylaminopropyl propionamide monomer, 70g of acrylic acid, and 7.5g of N,N-diallyl dodecylamine, stir evenly, then adjust the pH to 8 and add deionized water to the system to 1500g, cool the solution to 15°C with an ice bath, transfer the solution to a Dewar flask, pass high-purity nitrogen for 30 minutes, then start adding 0.15g of azobisisobutylimidazoline hydrochloride initiator, 0.03g of ammonium persulfate, 0.015g of sodium bisulfite, and 0.007g of bleaching powder to the solution, then continue to pass nitrogen until the solution becomes viscous and seal it.
[0039] After the adiabatic reaction temperature reaches the highest point, it is kept warm for 2 hours, the colloid is taken out from the Dewar flask, the colloid block is cut into 2-3 mm colloid particles, placed in a 70°C oven for drying for 2 hours, and then ground into a dry powder product.
[0040] Example 4
[0041] A method for preparing a CO2 capture and anti-channeling integrated functional polymer comprises the following steps:
[0042] Add 1000g of distilled water to a 2L beaker, then add 200g of AM monomer, 90g of dimethylaminopropyl propionamide monomer, 70g of acrylic acid, and 7.5g of N,N-diallyl dodecylamine, stir evenly, then adjust the pH to 8 and add deionized water to the system to 1500g, cool the solution to 15°C with an ice bath, transfer the solution to a Dewar flask, pass high-purity nitrogen for 30 minutes, then start adding 0.15g of azobisisobutylamidine hydrochloride initiator, 0.03g of sodium persulfate, 0.015g of sodium bisulfite, and 0.007g of bleaching powder to the solution, then continue to pass nitrogen until the solution becomes viscous and seal it.
[0043] After the adiabatic reaction temperature reaches the highest, keep it warm for 2 hours, put it into a 70℃ oven for 2 hours, and then grind it into a dry powder product.
[0044] Example 5
[0045] A method for preparing a CO2 capture and anti-channeling integrated functional polymer comprises the following steps:
[0046] Add 1000 g of distilled water to a 2 L beaker, then add 182 g of AM monomer, 108 g of dimethylaminopropyl propionamide monomer, 70 g of acrylic acid, and 7.5 g of N,N-diallyl dodecylamine, stir evenly, then adjust the pH to 8 and add deionized water to the system to 1500 g, cool the solution to 15°C with an ice bath, transfer the solution to a Dewar flask, pass high-purity nitrogen for 30 minutes, then begin to add 0.15 g of azobisisobutylamidine hydrochloride initiator, 0.03 g of ammonium persulfate, 0.015 g of sodium bisulfite, and 0.007 g of ammonium ferrous sulfate to the solution, then continue to pass nitrogen until the solution becomes viscous and then seal.
[0047] After the adiabatic reaction temperature reaches the highest point, it is kept warm for 2 hours, the colloid is taken out from the Dewar flask, the colloid block is cut into 2-3 mm colloid particles, placed in a 70°C oven for drying for 2 hours, and then ground into a dry powder product.
[0048] Example 6
[0049] A method for preparing a CO2 capture and anti-channeling integrated functional polymer comprises the following steps:
[0050] Add 1000g of distilled water to a 2L beaker, then add 200g of AM monomer, 90g of N-isopropylacrylamide monomer, 70g of acrylic acid, and 7.5g of N,N-diallyldodecylamine, stir evenly, then adjust the pH to 8 and add deionized water to the system to 1500g, cool the solution to 15°C with an ice bath, transfer the solution to a Dewar flask, pass high-purity nitrogen for 30 minutes, then start adding 0.15g of azobisisobutylimidazoline hydrochloride initiator, 0.03g of ammonium persulfate, 0.015g of sodium bisulfite, and 0.007g of bleaching powder to the solution, then continue to pass nitrogen until the solution becomes viscous and seal it.
[0051] After the adiabatic reaction temperature reaches the highest, keep it warm for 2 hours, put it into a 70℃ oven for 2 hours, and then grind it into a dry powder product.
[0052] Example 7
[0053] A method for preparing a CO2 capture and anti-channeling integrated functional polymer comprises the following steps:
[0054] Add 1000 g of distilled water to a 2 L beaker, then add 200 g of AM monomer, 90 g of diethylaminoethyl methacrylate, 70 g of acrylic acid, and 7.5 g of N,N-diallyl dodecylamine, stir evenly, then adjust the pH to 8 and add deionized water to the system to 1500 g, cool the solution to 15°C with an ice bath, transfer the solution to a Dewar flask, pass high-purity nitrogen for 30 minutes, then begin to add 0.15 g of azobisisobutylimidazoline hydrochloride initiator, 0.03 g of sodium persulfate, 0.015 g of sodium bisulfite, and 0.007 g of ammonium ferrous sulfate to the solution, then continue to pass nitrogen until the solution becomes viscous and then seal.
[0055] After the adiabatic reaction temperature reaches the highest, keep it warm for 2 hours, put it into a 70℃ oven for 2 hours, and then grind it into a dry powder product.
[0056] Example 8
[0057] A method for preparing a CO2 capture and anti-channeling integrated functional polymer comprises the following steps:
[0058] Add 1000g of distilled water to a 2L beaker, then add 200g of AM monomer, 90g of oleamidopropyl dimethylamine, 70g of acrylic acid, and 7.5g of N,N-diallyl dodecylamine, stir evenly, then adjust the pH to 8 and add deionized water to the system to 1500g, cool the solution to 15°C with an ice bath, transfer the solution to a Dewar flask, pass high-purity nitrogen for 30 minutes, then begin to add 0.15g of azobisisobutylimidazoline hydrochloride initiator, 0.03g of sodium persulfate, 0.015g of sodium bisulfite, and 0.007g of ammonium ferrous sulfate to the solution, then continue to pass nitrogen until the solution becomes viscous and then seal.
[0059] After the adiabatic reaction temperature reaches the highest, keep it warm for 2 hours, put it into a 70℃ oven for 2 hours, and then grind it into a dry powder product.
[0060] Comparative Example
[0061] Add 1000 g of distilled water to a 2 L beaker, then add 288 g of AM monomer and 72 g of acrylic acid, stir evenly, then adjust the pH to 8 and add deionized water to the system to 1500 g, cool the solution to 15°C with an ice bath and transfer the solution to a Dewar flask, pass high-purity nitrogen for 30 minutes, then begin to add 0.15 g of azobisisobutylimidazoline hydrochloride initiator, 0.03 g of sodium persulfate, 0.015 g of sodium bisulfite, and 0.007 g of ammonium ferrous sulfate to the solution, then continue to pass nitrogen until the solution becomes viscous and then seal.
[0062] After the adiabatic reaction temperature reaches the highest, keep it warm for 2 hours, put it into a 70℃ oven for 2 hours, and then grind it into a dry powder product.
[0063] Performance test 1
[0064] The products prepared in Examples 1-8 and the comparative examples were tested and characterized. Referring to the technical standard of polymers for oil displacement in SY-T 5862-2020, the viscosity test method is as follows: at room temperature and 500 r / min stirring conditions, 1 g of polymer powder (1 g is the mass of the effective content of the polymer product powder, the effective content of the polymer product powder is about 88-90%, and the rest is water, so the weight should be deducted by 100 and the water content should be deducted) is slowly added with 199 g (solution mineralization 10000 mg / L, Ca 2+ After the polymer is completely dissolved in simulated saline (concentration 500 mg / L), the polymer concentration is diluted to 3000 mg / L and tested at 70°C. The specific test results are shown in the following table:
[0065]
[0066] Performance Test 2
[0067] The CO2 responsive polymer prepared in Example 5 was used to prepare CO2 responsive polymer solutions with concentrations of 1500 mg / L and 3000 mg / L, and the viscosity changes before and after CO2 response were measured. The results are shown in FIG. Figure 1 and Figure 2 As shown in the figure, when the concentration of CO2-responsive polymer solution was 1500mg / L and 3000mg / L respectively, and the temperature was 70℃, before passing CO2, the viscosity of the polymer solution of the two concentrations was relatively low. After passing CO2, the viscosity of the two polymer solutions increased by 10 times and 30 times respectively. The above results show that the greater the concentration of the solution, the greater the increase in viscosity.
[0068] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering technicians in the field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have been fully recorded in the technical requirements.
Claims
1. A method for preparing a CO2 capture and anti-channeling integrated functional polymer, characterized in that: The following steps are involved: S1. dissolving acrylamide, acrylic acid, a hydrophobic monomer and a functional monomer having a CO2 response in water, and adjusting the pH to 7-8; S2. The solution temperature is controlled not to exceed 20°C, and a water-soluble initiator system is added after nitrogen is passed to remove oxygen. After the initiator is added, the solution quickly thickens, and the reaction system is closed for an adiabatic reaction. After the adiabatic reaction reaches the highest temperature, it is kept warm for 2-3 hours to obtain a CO2 capture and anti-channeling integrated functional polymer.
2. The method for preparing a CO2 capture and anti-channeling integrated functional polymer according to claim 1, characterized in that: The total monomer mass fraction of acrylamide, acrylic acid, hydrophobic monomer and CO2 responsive functional monomer is 20-30wt%, and the rest is water.
3. The method for preparing a CO2 capture and anti-channeling integrated functional polymer according to claim 1, characterized in that: The mass ratio of acrylamide, acrylic acid, hydrophobic monomer and CO2-responsive functional monomer is (12-17):4.6:0.5:(2-9).
4. The method for preparing a CO2 capture and anti-channeling integrated functional polymer according to claim 1, characterized in that: The hydrophobic monomer is N,N-diallyl dodecylamine.
5. The method for preparing a CO2 capture and anti-channeling integrated functional polymer according to claim 1, characterized in that: The CO2 responsive functional monomer is selected from one or a combination of N,N-dimethylacrylamide, diethylaminoethyl methacrylate, N-isopropylacrylamide, dimethylaminopropylpropionamide, and long-chain alkyl tertiary amines containing double bonds.
6. The method for preparing a CO2 capture and anti-channeling integrated functional polymer according to claim 1, characterized in that: The water-soluble initiator system accounts for 0.0004%-0.01% of the total mass of the reaction system; the water-soluble initiator system includes an azo initiator, an oxidant, a reductant and an initiation aid, and the masses of the azo initiator, the oxidant, the reductant and the initiation aid are (1-3):(0.02-0.1):(0.01-0.05):(0.005-0.03).
7. The method for preparing a CO2 capture and anti-channeling integrated functional polymer according to claim 6, characterized in that: The water-soluble initiator system is selected from a combination of potassium persulfate, ammonium persulfate, sodium bisulfite, sodium persulfate, bleaching powder, ammonium ferrous sulfate, azobisisobutylamidine hydrochloride, azobisisobutylimidazoline hydrochloride, and azobisisobutylamidine hydrochloride.
8. The method for preparing a CO2 capture and anti-channeling integrated functional polymer according to claim 1, characterized in that: In step S2, the polymerized rubber block is cut into 3-5 mm rubber particles, dried at 60-70° C. for 1-2 hours, and then ground into a dry powder product.
9. A CO2 capture and anti-crossing integrated functional polymer prepared by the preparation method according to any one of claims 1 to 8.