CN112778455A - Temperature-resistant salt-resistant hydrophobic association polymer and preparation method and application thereof - Google Patents
Temperature-resistant salt-resistant hydrophobic association polymer and preparation method and application thereof Download PDFInfo
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- CN112778455A CN112778455A CN202011606667.8A CN202011606667A CN112778455A CN 112778455 A CN112778455 A CN 112778455A CN 202011606667 A CN202011606667 A CN 202011606667A CN 112778455 A CN112778455 A CN 112778455A
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- 229920000642 polymer Polymers 0.000 title claims abstract description 55
- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 47
- 150000003839 salts Chemical class 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000000178 monomer Substances 0.000 claims abstract description 43
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical group NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000000203 mixture Substances 0.000 claims abstract description 20
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 11
- 239000003999 initiator Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000007800 oxidant agent Substances 0.000 claims abstract description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 20
- 229940048053 acrylate Drugs 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 7
- 239000003638 chemical reducing agent Substances 0.000 claims description 7
- 150000002894 organic compounds Chemical class 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000006184 cosolvent Substances 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims description 4
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 4
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical group [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 4
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000004202 carbamide Substances 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 4
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 4
- 229940047670 sodium acrylate Drugs 0.000 claims description 4
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 2
- 235000019270 ammonium chloride Nutrition 0.000 claims description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 2
- ACWKAVFAONSRKJ-UHFFFAOYSA-M hexadecyl-dimethyl-prop-2-enylazanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+](C)(C)CC=C ACWKAVFAONSRKJ-UHFFFAOYSA-M 0.000 claims description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 claims 1
- 230000003301 hydrolyzing effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000007787 solid Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 239000003208 petroleum Substances 0.000 description 4
- 239000000084 colloidal system Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- -1 dodecyl dimethyl allyl ammonium chloride Chemical compound 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000013365 molecular weight analysis method Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000004391 petroleum recovery Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
-
- 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
- C09K8/588—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
-
- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/882—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
Abstract
The application discloses a temperature-resistant and salt-resistant hydrophobic association polymer, a preparation method and application thereof, wherein the method at least comprises the following steps: carrying out polymerization reaction on a mixture containing an acrylamide monomer and a hydrophobic monomer in the presence of an initiator to obtain a temperature-resistant salt-resistant hydrophobic association polymer; the initiator includes an oxidizing agent. The preparation method provided by the application improves the proportion of the hydrophobic monomer in the hydrophobic association polymer, and the obtained hydrophobic association polymer has proper molecular weight, so that the temperature resistance and salt resistance of the hydrophobic association polymer are improved. In addition, the preparation method has the advantages of low price of the adopted raw materials, convenience, simplicity and easiness in operation.
Description
Technical Field
The application relates to a temperature-resistant salt-resistant hydrophobic association polymer, a preparation method and application thereof, belonging to the field of mining.
Background
China's per capita petroleum resource only accounts for 1/6 on the average level in the world, nearly 50% of crude oil needs to be imported every year, and the demand of national industry on petroleum is continuously increased along with the continuous and stable increase of national economy. However, most of oil fields developed in China enter the middle and later stages of development, the exploitation efficiency is low, the contradiction between the supply and demand of petroleum is aggravated, and the research and the development of novel materials are urgent for improving the petroleum recovery ratio.
The polymer is the most common oil displacement agent in oil fields, but the conventional polymer cannot meet the oil exploitation requirements as the oil field exploration and development develops to unconventional oil reservoir conditions of high temperature, high salinity, low permeability and the like, so that the research and development of novel temperature-resistant and salt-resistant polymers are important tasks for promoting the technical development of the petroleum industry in China. The hydrophobic association polymer can keep certain viscosity under complex oil reservoir conditions such as high temperature and high salinity, and is an excellent oil displacement agent.
In the prior art, because the hydrophobic monomer in the hydrophobic association polymer is insoluble in water, the hydrophobic association polymer with higher hydrophobic monomer proportion is difficult to obtain, and the higher the hydrophobic monomer proportion in the hydrophobic association polymer is, the better the temperature and salt resistance of the hydrophobic association polymer is, and the common hydrophobic association polymer does not meet the performance requirements along with the gradual development of oil reservoir conditions to high temperature and high salt.
Disclosure of Invention
According to one aspect of the application, the temperature-resistant and salt-resistant hydrophobic association polymer, the preparation method and the application thereof are provided, and the problems that the proportion of hydrophobic monomers in the existing hydrophobic association polymer is difficult to improve and the temperature-resistant and salt-resistant performances are insufficient are solved.
The preparation method of the temperature-resistant and salt-resistant hydrophobically associating polymer at least comprises the following steps:
carrying out polymerization reaction on a mixture containing an acrylamide monomer and a hydrophobic monomer in the presence of an initiator to obtain a temperature-resistant salt-resistant hydrophobic association polymer;
the initiator includes an oxidizing agent.
Optionally, the mixture further comprises an acrylate monomer;
the dosage of the acrylate monomer is 0-25% of the mass of the acrylamide monomer.
Specifically, the lower limit of the amount of the acrylate monomer can be independently selected from 0, 1%, 5%, 8% and 10% of the mass of the acrylamide monomer; the upper limit of the amount of the acrylate monomer may be independently selected from 12, 15%, 18%, 20%, 25% by mass of the acrylamide monomer.
Optionally, the mixture further comprises a cosolvent;
the cosolvent comprises organic compounds or/and sulfate;
the organic compound is at least one of urea and ammonium chloride;
the sulfate is at least one selected from anhydrous sodium sulfate and anhydrous calcium chloride.
Optionally, the amount of the organic compound is 0.4-0.8% of the total mass of the acrylamide monomer and the acrylate monomer;
the dosage of the sulfate is 0.1-0.3% of the total mass of the acrylamide monomer and the acrylate monomer.
Specifically, the amount of the organic compound may be independently selected from 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, or any value therebetween, based on the total mass of the acrylamide monomer and the acrylate monomer.
Specifically, the amount of sulfate may be independently selected from 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, or any value therebetween, based on the total mass of the acrylamide monomer and the acrylate monomer.
Optionally, the hydrophobic monomer is selected from at least one of dodecyl dimethyl allyl ammonium chloride and hexadecyl dimethyl allyl ammonium chloride.
Optionally, the amount of the hydrophobic monomer is 0.5-5% of the total mass of the acrylamide monomer and the acrylate monomer.
Alternatively, the hydrophobic monomer may be used in an amount independently selected from 0.5%, 1%, 1.7%, 3%, 3.1%, 5%, or any value therebetween, based on the total mass of the acrylamide monomer and the acrylate monomer.
Optionally, the oxidant is selected from at least one of potassium persulfate and ammonium persulfate.
Optionally, the amount of the oxidant is 0.4-0.6% of the total mass of the acrylamide monomer and the acrylate monomer.
Specifically, the amount of oxidizing agent used may be independently selected from 0.4%, 0.45%, 0.5%, 0.55%, 0.6%, or any value therebetween, based on the mass of the polymer monomer.
Optionally, the initiator further comprises a reducing agent;
the reducing agent is sodium bisulfite
The dosage of the reducing agent is 0.2-0.3% of the total mass of the acrylamide monomer and the acrylate monomer.
Specifically, the amount of reducing agent used may be independently selected from 0.2%, 0.23%, 0.25%, 0.27%, 0.3%, or any value therebetween, based on the mass of the polymer monomer.
Optionally, the mixture further comprises a solvent, the solvent being water;
the mass ratio of the solvent to the acrylamide monomer is 15-25: 4.
the sum of the total mass of the acrylamide monomer and the acrylate monomer accounts for 15-25% of the mass of the whole system.
Optionally, the method comprises:
s001, mixing an acrylamide monomer, a sodium acrylate monomer and water, adding a cosolvent, and uniformly mixing to obtain a mixture I;
s002, adjusting the pH value of the mixture I to 8-13, adding a hydrophobic monomer into the mixture I, and uniformly mixing to obtain a mixture II;
and S002, adding an initiator into the mixture II to perform polymerization reaction to obtain the temperature-resistant salt-resistant hydrophobic association polymer.
The pH value is adjusted by using an alkaline solution, which is not particularly limited in the application, and in the specific implementation process, the technology in the art can select the alkaline solution with corresponding concentration according to the requirement, such as a sodium hydroxide solution, a sodium carbonate solution and the like,
alternatively, the conditions of the polymerization reaction are:
the initial reaction temperature is 0-30 ℃, and the reaction time is 6-10 h;
preferably, the polymerization is carried out under an inert gas blanket.
Preferably, the reaction is carried out under adiabatic conditions, i.e. without heat exchange with the outside during the reaction.
Preferably, the inert gas used may be nitrogen, argon, or the like.
Specifically, the lower limit of the initial reaction temperature may be independently selected from 0 ℃, 5 ℃, 8 ℃, 10 ℃, 15 ℃; the upper limit of the initial reaction temperature may be independently selected from the group consisting of 17 deg.C, 20 deg.C, 22 deg.C, 25 deg.C, and 30 deg.C.
Specifically, the reaction time can be independently selected from 6h, 7h, 8h, 9h and 10 h.
According to another aspect of the application, a temperature-resistant and salt-resistant hydrophobic association polymer is provided, which is prepared by any one of the preparation methods.
According to yet another aspect of the present application, there is provided the use of a temperature and salt tolerant hydrophobically associative polymer in an oil field oil displacing agent.
Optionally, the above application comprises at least the following steps:
granulating the temperature-resistant salt-resistant hydrophobic association polymer to obtain polymer particles;
and drying and crushing the polymer particles to obtain the oil displacement agent.
The use mode of the oil displacement agent for oil displacement of the oil field is known to those skilled in the art, and the oil displacement agent and water can be mixed and injected into the oil well according to the oil field requirement by the skilled in the art according to a certain proportion.
Optionally, the polymer particles have a particle size of 3 to 6 mm.
Optionally, the temperature of drying is 50 ℃ to 70 ℃.
The drying time is not particularly limited, and can be adjusted by those skilled in the art according to the drying condition of the polymer particles.
Specifically, the lower limit of the drying temperature can be independently selected from 50 deg.C, 52 deg.C, 55 deg.C, 57 deg.C, 60 deg.C; the upper limit of the drying temperature can be independently selected from 62 deg.C, 64 deg.C, 65 deg.C, 67 deg.C, and 70 deg.C.
Optionally, the particle size of the crushed polymer particles is 40-50 meshes.
The beneficial effects that this application can produce include:
1) the preparation method provided by the application improves the proportion of the hydrophobic monomer in the hydrophobic association polymer, and the molecular weight of the obtained hydrophobic association polymer is 800-1300 ten thousand, so that the temperature resistance and salt resistance of the hydrophobic association polymer are improved.
2) The temperature-resistant and salt-resistant hydrophobic association polymer prepared by the preparation method provided by the application has good water solubility.
3) The preparation method provided by the application has the advantages that the adopted raw materials are low in price, and the preparation method is convenient, simple and easy to operate.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
The raw materials in the examples of the present application were all commercially available unless otherwise specified.
The analysis method in the examples of the present application is as follows:
polymer molecular weight analysis was performed using an Ubbelohde viscometer.
Example 1
Step 1, mixing 80g of acrylamide, 20g of sodium acrylate and 398.6 g of water in a preparation kettle, adding 0.6g of urea and 0.2g of sodium sulfate, uniformly mixing, adjusting the pH value to 8 by using 10 wt% of sodium hydroxide solution, stirring for 25min, and keeping the frequency at 200 Hz;
and 2, transferring the mixed system to a polymerization kettle, introducing high-pressure nitrogen for 20min, adding 0.4g of potassium persulfate and 0.2g of sodium bisulfite, starting to react for 9h at the temperature of 20 ℃, and polymerizing to generate polyacrylamide, which is recorded as a sample 1.
Example 2
Step 1, mixing 80g of acrylamide, 20g of sodium acrylate and 398.6 g of water in a preparation kettle, adding 0.6g of urea and 0.2g of sodium sulfate, uniformly mixing, adjusting the pH value to 8 by using a 10 wt% sodium hydroxide solution, stirring for 25min, and keeping the frequency at 200 Hz;
step 2, adding 1g of dodecyl dimethyl allyl ammonium chloride into the mixture obtained in the step 1, stirring for 25min, and uniformly mixing;
and 3, transferring the mixed system to a polymerization kettle, introducing high-pressure nitrogen for 20min, adding 0.4g of potassium persulfate and 0.2g of sodium bisulfite, starting to react for 9h at the temperature of 20 ℃, and polymerizing to generate polyacrylamide, which is recorded as sample 2.
Examples 3 to 6
Examples 3-6 were prepared substantially the same as example 2, except as set forth in Table 1.
TABLE 1
Example 7
The comparative polymer is purchased from Zhejiang Xin Yonghe biochemical industry Co., Ltd, has a hydrolysis degree of 20 percent and a molecular weight of 1500 ten thousand, and does not contain functional monomers. And recorded as sample 7.
Example 3
Placing the obtained polymer colloid into a coarse granulating machine for coarse granulation, and then placing the polymer colloid into a fine granulating machine for fine granulation to obtain 4mm polymer colloid block particles;
drying the obtained particles in a vibration drying bed through a rotary flow-through machine, and controlling the temperature to be 60 ℃;
and crushing the dried particles, and sieving the particles by a 50-mesh sieve to obtain a sample which can be used as an oil displacement agent.
And detecting the temperature resistance and salt resistance of the samples 1-7 after the treatment. The test method comprises the following steps: the polymer was dissolved in a 1500ppm solution using 3w of a mineralized brine having a calcium ion content of 2000ppm, and the solution was tested for viscosity at 60 ℃ and a shear rate of 7.34s using a Haake rheometer-1。
The detection result is as follows: sample 1 viscosity was 5.4cp, sample 2 viscosity was 9cp, sample 3 was 18cp, sample 4 was 32cp, sample 5 was 9.5 cp, sample 6 was 7.5cp, and sample 7 viscosity was 7.2 cp. The temperature resistance and salt resistance of the hydrophobically associating polymer are obviously improved compared with the existing oil displacement agent. Meanwhile, in 5 samples obtained by the method, the temperature resistance and salt resistance of the samples are correspondingly improved along with the increase of the consumption of the hydrophobic monomer in the preparation, which shows that the proportion of the hydrophobic monomer in the hydrophobic association polymer has obvious influence on the temperature resistance and salt resistance of the samples;
the water solubility of the samples 1 to 7 treated as described above was examined. The test method comprises the following steps: the polymer particles are mutually dissolved with deionized water according to the ratio of 1:99, the mechanical stirring is carried out for 2.5 hours at the room temperature of 500r/min, 100ml of solution is taken to pass through a 100-mesh sieve, and the more solid particles left in the sieve indicates that the solubility is poorer.
The detection result is as follows: sample 7 had no solid particles remaining, sample 1 had no solid residues, sample 2 had no solid residues, sample 3 had no solid residues, sample 4 had 2 pieces of solid residues, sample 5 had 5 pieces of solid residues, and sample 6 had 3 pieces of solid residues. This demonstrates that the hydrophobically associative polymers herein have good water solubility.
Example 4
The molecular weights of the samples 1 to 6 are respectively 1350 ten thousand, 1270 ten thousand, 1150 ten thousand, 1100 ten thousand, 1300 ten thousand and 1100 ten thousand.
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (10)
1. A preparation method of a temperature-resistant and salt-resistant hydrophobic association polymer is characterized by at least comprising the following steps:
carrying out polymerization reaction on a mixture containing an acrylamide monomer and a hydrophobic monomer in the presence of an initiator to obtain the temperature-resistant salt-resistant hydrophobic association polymer;
the initiator includes an oxidizing agent.
2. The method of claim 1, wherein the mixture further comprises an acrylate monomer;
the dosage of the acrylate monomer is 0-25% of the mass of the acrylamide monomer.
3. The method of claim 2, wherein the mixture further comprises a co-solvent;
the cosolvent comprises an organic compound or/and a sulfate;
the organic compound is selected from at least one of urea and ammonium chloride;
the sulfate is at least one of anhydrous sodium sulfate and anhydrous calcium chloride.
4. The preparation method according to claim 3, wherein the amount of the organic compound is 0.4 to 0.8 percent of the total mass of the acrylamide monomer and the acrylate monomer;
the dosage of the sulfate is 0.1-0.3% of the total mass of the acrylamide monomer and the acrylate monomer.
5. The method according to claim 1, wherein the hydrophobic monomer is at least one selected from the group consisting of dodecyldimethylallylammonium chloride and hexadecyldimethylallylammonium chloride;
preferably, the oxidant is selected from at least one of ammonium persulfate and potassium persulfate;
preferably, the initiator further comprises a reducing agent;
the reducing agent is sodium bisulfite;
the dosage of the reducing agent is 0.2-0.3% of the total mass of the acrylamide monomer and the acrylate monomer;
preferably, the mixture further comprises a solvent, the solvent comprising water;
the mass ratio of the solvent to the acrylamide monomer is 15-25: 4.
6. the preparation method according to claim 2, wherein the amount of the hydrophobic monomer is 0.5-5% of the total mass of the acrylamide monomer and the acrylate monomer;
preferably, the amount of the oxidant is 0.4-0.6% of the total mass of the acrylamide monomer and the acrylate monomer.
7. The production method according to any one of claims 1 to 6, characterized in that the method comprises:
s001, mixing an acrylamide monomer, a sodium acrylate monomer and water, adding a cosolvent, and uniformly mixing to obtain a mixture I;
s002, adjusting the pH value of the mixture I to 8-13, adding a hydrophobic monomer into the mixture I, and uniformly mixing to obtain a mixture II;
s002, adding an initiator into the mixture II to perform polymerization reaction to obtain the temperature-resistant salt-resistant hydrophobic association polymer;
preferably, the polymerization conditions are:
the reaction temperature is 20-60 ℃, and the reaction time is 6-10 h;
preferably, the polymerization reaction is carried out under the protection of inert gas.
8. A temperature-resistant salt-resistant hydrophobically associating polymer, which is prepared by the preparation method of any one of claims 1 to 7.
9. The use of the temperature and salt tolerant hydrophobically associative polymer of claim 8 in oil field displacement agents.
10. Use according to claim 9, characterised in that it comprises at least the following steps:
heating, hydrolyzing and granulating the temperature-resistant salt-resistant hydrophobic association polymer to obtain polymer particles;
drying and crushing the polymer particles to obtain an oil displacement agent;
preferably, the particle size of the polymer particles is 3-6 mm;
preferably, the drying temperature is 50 ℃ to 70 ℃.
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