CN111607032A - Thickening agent, preparation method and application thereof - Google Patents
Thickening agent, preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a thickening agent, a preparation method and application thereof, and belongs to the technical field of oilfield acidification. The chemical structural formula of the thickening agent provided by the embodiment of the invention is as follows:
Description
Technical Field
The invention relates to the technical field of oilfield acidification. In particular to a thickening agent, a preparation method and application thereof.
Background
In the process of oil and gas field exploitation, acidification and production increase are important measures for oil and gas field reservoir transformation. The acidizing and production increasing mainly means that thickening acid is injected into a stratum through a well hole, the injected thickening acid reacts with rock cement or other dissolubles in an oil-gas layer, and pores and cracks are increased, so that the permeability of the oil-gas layer is improved, and the purpose of increasing the production of an oil-gas field is achieved. However, under high temperature conditions, the movement rate and the reaction rate of hydrogen ions in the gelled acid are high, the gelled acid does not reach the deep part of an oil-gas layer and is consumed by rock cement or other dissolubles in a near well zone, and the aim of acidizing and production increasing cannot be achieved. In addition, when the gelled acid is injected into the stratum, the frictional resistance between the gelled acid and the wall surface of the pipe column is large, and the injection amount of the gelled acid is limited within the limited pressure-bearing range of the acid liquid pump. At present, a thickening agent, which is generally a high-molecular polymer, is mainly added into the thickening acid to reduce the frictional resistance between the thickening acid and the wall surface of a pipe column, and the movement rate and the reaction rate of the thickening acid are controlled, so that the acidification effect is improved, and the yield of an oil and gas field is increased.
The thickening agent in the prior art is mainly an acrylamide polymer, but through experimental determination, the thickening agent provided by the prior art has poor high temperature resistance and poor compatibility with thickening acid, and the prepared thickening acid has large frictional resistance, so that the yield increasing effect of an oil-gas field is poor, and the operation efficiency is low.
Disclosure of Invention
The embodiment of the invention provides a thickening agent, a preparation method and application thereof, and can solve the problems of poor yield increasing effect and low operation efficiency of an oil-gas field. The specific technical scheme is as follows:
in one aspect, an embodiment of the present invention provides a thickening agent, where a chemical structural formula of the thickening agent is:
wherein, x: y: the value of z is 35000-60000: 80-600: 10-55, wherein x, y and z are integers;
the viscosity average molecular weight of the thickening agent is 900-1300 ten thousand.
In one possible implementation, the raw materials for preparing the thickening agent include:
three monomers of 2-acrylamide-2-methyl propyl sodium sulfonate, methacryloyloxyethyl trimethyl ammonium chloride and 4-ethyl benzene sodium sulfonate;
the mass ratio of the 2-acrylamide-2-methylpropanesulfonic acid sodium salt to the methacryloyloxyethyl trimethyl ammonium chloride to the 4-ethyl benzene sodium sulfonate is 22924-11462: 311.55-20.77: 10.41-2.08.
In one possible implementation manner, the raw materials for preparing the thickening agent further include:
cosolvent, chain transfer agent, azo initiator and redox agent;
wherein the mass of the cosolvent is 0.10-0.25% of the total mass of the three monomers;
the mass of the chain transfer agent is 0.05-0.15% of the total mass of the three monomers;
the mass of the azo initiator is 0.01-0.05% of the total mass of the three monomers;
the mass of the redox agent is 0.01-0.08% of the total mass of the three monomers.
In one possible implementation mode, the cosolvent is a mixture of acetamide and sodium salicylate, and the mass ratio of acetamide to sodium salicylate is 1-4: 1 to 6.
In one possible implementation manner, the chain transfer agent is a mixture of polyethylene glycol dimethacrylate and sodium formate, and the mass ratio of the polyethylene glycol dimethacrylate to the sodium formate is 5-10: 1 to 4.
In one possible implementation, the azo initiator is azobisisobutyramidine hydrochloride.
In one possible implementation manner, the redox agent is a mixture of potassium thiosulfate and sodium formaldehyde sulfoxylate, and the mass ratio of the potassium thiosulfate to the sodium formaldehyde sulfoxylate is 1-5: 1 to 5.
In another aspect, an embodiment of the present invention provides a preparation method of a thickening agent, where the preparation method includes:
adding three monomers, namely 2-acrylamide-2-methyl propyl sodium sulfonate, methacryloyloxyethyl trimethyl ammonium chloride and 4-ethyl benzene sodium sulfonate, into a reactor according to the mass ratio of the components, adding a first volume of deionized water into the reactor, and preparing to obtain an aqueous solution with the mass concentration of 30-45%;
introducing nitrogen with the purity of 99.999% into the reactor, respectively adding a cosolvent, a chain transfer agent, an azo initiator and a redox agent into the aqueous solution at a uniform stirring speed within a second time interval after the first time interval, and finally adding a second volume of deionized water to prepare a third volume of reaction liquid system;
the reaction liquid system reacts for 3 to 4 hours at the temperature of between 45 and 55 ℃ to obtain a reaction product;
and drying and crushing the reaction product at 60 ℃ to obtain the thickening agent.
In a possible implementation manner, after the preparing of the third volume of the reaction liquid system, the preparation method further includes:
controlling the temperature rise speed of the reactor to be 1 ℃/min, and setting the temperature control temperature difference of the reactor within +/-1 ℃ when the temperature of the reactor reaches 45-55 ℃.
On the other hand, the embodiment of the invention also provides the application of the thickening agent in the process of preparing the thickening acid.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the chemical structural formula of the thickening agent provided by the embodiment of the invention is shown as above, the viscosity average molecular weight of the thickening agent is 900-1300 ten thousand, and the frictional resistance between thickening acid and an acid liquid pump can be effectively reduced. In addition, the chemical structural formula of the thickening agent contains a functional group of methacryloyloxyethyl trimethyl ammonium chloride and a sulfonic acid group which can improve the high-temperature resistance of the thickening agent. Therefore, the thickening agent can reduce the frictional resistance between the thickening acid and an acid liquid pump and improve the high-temperature resistance of the thickening acid, and the preparation method of the thickening agent is simple in process, short in time consumption and convenient to popularize and apply.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following describes embodiments of the present invention in further detail.
In one aspect, the embodiment of the present invention provides a thickening agent, where the chemical structural formula of the thickening agent is as follows:
wherein, x: y: the value of z is 35000-60000: 80-600: 10-55, wherein x, y and z are integers;
the viscosity average molecular weight of the thickening agent is 900-1300 ten thousand.
The chemical structural formula of the thickening agent provided by the embodiment of the invention is shown as above, the viscosity average molecular weight of the thickening agent is 900-1300 ten thousand, and the frictional resistance between thickening acid and an acid liquid pump can be effectively reduced. In addition, the chemical structural formula of the thickening agent contains a functional group of methacryloyloxyethyl trimethyl ammonium chloride and a sulfonic acid group which can improve the high-temperature resistance of the thickening agent. Therefore, the thickening agent can reduce the frictional resistance between the thickening acid and an acid liquid pump and improve the high-temperature resistance of the thickening acid, and the preparation method of the thickening agent is simple in process, short in time consumption and convenient to popularize and apply.
The thickening agent provided by the embodiment of the invention only represents the chemical structural formula of a polymer of three monomers, namely 2-acrylamide-2-methyl propyl sodium sulfonate, methacryloyloxyethyl trimethyl ammonium chloride and 4-ethyl benzene sodium sulfonate, wherein the specific arrangement position of each monomer in the chemical structural formula has uncertainty. For example, the chemical structural formula of the thickener provided in the embodiment of the present invention may be a chemical structural formula obtained by cross-arrangement of three monomers, a chemical structural formula obtained by polymerizing the same monomers first to obtain a monomer polymer, and then polymerizing the three monomer polymers, or a chemical structural formula obtained by irregularly polymerizing the three monomers, which is not specifically limited in the embodiment of the present invention.
x: y: the value of z is 35000-60000: 80-600: 10-55, wherein x, y and z are integers. For example, x: y: the value of z may be 35000: 80: 10, 35000: 90: 20, 40000: 100: 30, 50000: 200: 40, 60000: 400: 50, 60000: 600: 55, etc.
The viscosity average molecular weight of the thickening agent is 900-1300 ten thousand. For example, the viscosity average molecular weight of the thickener may be 900 ten thousand, 950 ten thousand, 1000 ten thousand, 1100 ten thousand, 1150 ten thousand, 1200 ten thousand, 1300 ten thousand, or the like. The thickening agent has large viscosity average molecular weight and long molecular chain, and can effectively reduce the frictional resistance between thickening acid and an acid liquid pump.
In one possible implementation, the raw materials for preparing the thickening agent include:
three monomers of 2-acrylamide-2-methyl propyl sodium sulfonate, methacryloyloxyethyl trimethyl ammonium chloride and 4-ethyl benzene sodium sulfonate;
the mass ratio of the 2-acrylamide-2-methyl sodium propanesulfonate to the methacryloyloxyethyl trimethyl ammonium chloride to the 4-ethyl benzene sodium sulfonate is 22924-11462: 311.55-20.77: 10.41-2.08.
Wherein the molar ratio of the 2-acrylamide-2-methylpropanesulfonic acid sodium salt to the methacryloyloxyethyl trimethyl ammonium chloride to the 4-ethyl benzene sodium sulfonate is 100-50: 1.5-0.1: 0.05 to 0.01. For example, the molar ratios of the three monomers are 100: 1.5: 0.05, 100: 1: 0.04, 80: 1: 0.03, 50: 0.1: 0.01. in addition, the functional group of the methacryloyloxyethyl trimethyl ammonium chloride and the sulfonic acid group in the 4-ethyl benzene sodium sulfonate can improve the high temperature resistance of the thickening agent.
In one possible implementation, the raw materials for preparing the thickening agent further include:
cosolvent, chain transfer agent, azo initiator and redox agent;
wherein, the mass of the cosolvent is 0.10-0.25% of the total mass of the three monomers;
the mass of the chain transfer agent is 0.05-0.15% of the total mass of the three monomers;
the mass of the azo initiator is 0.01-0.05% of the total mass of the three monomers;
the mass of the oxidation reducing agent is 0.01-0.08% of the total mass of the three monomers.
For example, the mass of the co-solvent is 0.1%, 0.15%, 0.18%, 0.20%, 0.23%, 0.25% or the like of the total mass of the three monomers. The mass of the chain transfer agent is 0.05%, 0.07%, 0.08%, 0.10%, 0.12%, 0.15% and the like of the total mass of the three monomers. The mass of the azo initiator is 0.01%, 0.02%, 0.03%, 0.04%, 0.05% and the like of the total mass of the three monomers. The mass of the redox agent is 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08% and the like of the total mass of the three monomers.
In the embodiment of the invention, the cosolvent is a mixture of acetamide and sodium salicylate, and the mass ratio of acetamide to sodium salicylate is (1-4): 1 to 6. For example, the mass ratio of acetamide to sodium salicylate can be 1: 1. 1: 2. 1: 3. 2: 3. 2: 5. 3: 4. 3: 5. 4: 5, and the like. The acetamide and the sodium salicylate can increase the solubility of the three monomers in water, and are favorable for better reaction of the three monomers in the preparation of the thickening agent.
In the embodiment of the invention, the chain transfer agent is a mixture of polyethylene glycol dimethacrylate and sodium formate, and the mass ratio of the polyethylene glycol dimethacrylate to the sodium formate is 5-10: 1 to 4. For example, the mass ratio of polyethylene glycol dimethacrylate to sodium formate may be 5: 1. 5: 2. 6: 2. 6: 3. 7: 2. 8: 3. 9: 4. 10: 3, etc. The polyethylene glycol dimethacrylate and the sodium formate can effectively enable chain growth free radicals to generate a reagent for transferring free radicals, and the viscosity average molecular weight of the thickening agent can be adjusted.
The azo initiator is a free radical initiator with a molecular structure containing nitrogen-nitrogen double bonds. In the present embodiment, the azo initiator is azobisisobutyramidine hydrochloride. The azodiisobutyl amidine hydrochloride belongs to a water-soluble azo initiator, and compared with a common azo initiator, the azodiisobutyl amidine hydrochloride has high initiation efficiency, and the obtained thickening agent has high viscosity-average molecular weight, good water solubility and less residues.
In the present example, the redox agent is a mixture of potassium thiosulfate and sodium formaldehyde sulfoxylate. The mass ratio of the potassium thiosulfate to the sodium formaldehyde sulfoxylate is 1-5: 1 to 5. For example, the mass ratio of potassium thiosulfate to sodium formaldehyde sulfoxylate is 1: 1. 1: 2. 1: 3. 2: 3. 2: 5. 3: 4. 3: 5. 4: 5, and the like.
On the other hand, the embodiment of the invention provides a preparation method of a thickening agent, which comprises the following steps:
step 1: adding three monomers, namely 2-acrylamide-2-methyl propyl sodium sulfonate, methacryloyloxyethyl trimethyl ammonium chloride and 4-ethyl benzene sodium sulfonate, into a reactor according to the mass ratio of the components, adding a first volume of deionized water into the reactor, and preparing to obtain an aqueous solution with the mass concentration of 30-45%.
The mass ratio of the 2-acrylamide-2-methyl sodium propanesulfonate to the methacryloyloxyethyl trimethyl ammonium chloride to the 4-ethyl benzene sodium sulfonate is 22924-11462: 311.55-20.77: 10.41-2.08, the molar ratio is 100-50: 1.5-0.1: 0.05 to 0.01.
Step 2: introducing nitrogen with the purity of 99.999% into the reactor, respectively adding a cosolvent, a chain transfer agent, an azo initiator and a redox agent into the aqueous solution at a uniform stirring speed within a second time interval after the first time interval, and finally adding a second volume of deionized water to prepare a third volume of reaction liquid system.
The first time interval may be set and changed as needed, and in the embodiment of the present invention, the first time interval is not particularly limited. For example, the first time interval may be 14min, 15min, or 20 min. The second time interval may be set and changed as needed, and in the embodiment of the present invention, the first set time is not particularly limited. For example, the second time interval may be 60min, 65min, or 70 min.
The uniform stirring speed can be 80r/min (revolutions per minute), 100r/min, 120r/min, and the like. In the embodiment of the present invention, the uniform stirring speed is not particularly limited.
And step 3: controlling the temperature rise speed of the reactor to be 1 ℃/min, and setting the temperature control temperature difference of the reactor within +/-1 ℃ when the temperature of the reactor reaches 45-55 ℃.
And 4, step 4: the reaction liquid system reacts for 3 to 4 hours at the temperature of between 45 and 55 ℃ to obtain a reaction product.
Three monomers of 2-acrylamide-2-methyl propyl sodium sulfonate, methacryloyloxyethyl trimethyl ammonium chloride and 4-ethyl benzene sodium sulfonate, a cosolvent, a chain transfer agent, an azo initiator and a redox agent in a reactor are reacted for 3 to 4 hours at the temperature of between 45 and 55 ℃ to obtain a reaction product.
The reaction product is a gel-like product.
And 5: and drying and crushing the reaction product at 60 ℃ to obtain the thickening agent.
The preparation method of the thickening agent is simple in process and short in time consumption.
The technical solution of the present invention will be described in detail by specific examples below.
In the following examples, those whose operations are not subject to the conditions indicated, are carried out according to the conventional conditions or conditions recommended by the manufacturer. The raw materials are conventional products which can be obtained commercially by manufacturers and specifications.
Wherein, the high-concentration hydrochloric acid corrosion inhibitor for CT1-3 acidification, the corrosion inhibition synergist for CT1-5B acidification, the CT1-7 iron ion stabilizer and the CT5-9 cleanup additive are all purchased from Hipport technology development Limited company.
This example provides a thickener having a viscosity average molecular weight of 900 ten thousand, which is prepared by the following method:
according to the mass ratio of each component, 149.73g of 3 monomers of 2-acrylamide-2-methyl propyl sodium sulfonate, 0.24g of methacryloyloxyethyl trimethyl ammonium chloride and 0.02g of 4-ethyl benzene sodium sulfonate are added into a reactor with the volume of 500mL, and a first volume of deionized water is added into the reactor to prepare an aqueous solution with the mass concentration of 30%. Introducing nitrogen with the purity of 99.999 percent into a reactor, after 15min, respectively adding 0.021g of acetamide, 0.129g of sodium salicylate, 0.0625g of polyethylene glycol dimethacrylate, 0.0125g of sodium formate, 0.015g of azodiisobutyl amidine hydrochloride, 0.0075g of potassium thiosulfate and 0.0075g of sodium formaldehyde sulfoxylate into the aqueous solution at the speed of 100r/min within 60min, and finally adding a second volume of deionized water to prepare a reaction system with the total volume of 500 mL. Controlling the temperature rise speed of the reactor to be 1 ℃/min, and setting the temperature control temperature difference of the reactor within 45 +/-1 ℃ when the temperature of the reactor reaches 45 ℃. The reaction liquid reacts for 3 hours at the temperature of 45 ℃ to obtain a reaction product. And drying and crushing the reaction product at 60 ℃ to obtain the thickening agent.
The viscosity average molecular weight of the thickening agent is 900 ten thousand measured by a light scattering method, and the chemical structural formula is as follows:
wherein x is 35000-45000, y is 80-500, and z is 10-55.
This example provides a thickener having a viscosity average molecular weight of 950 ten thousand prepared by the following method:
according to the mass ratio of each component, 173.91g of 2-acrylamide-2-methyl sodium propanesulfonate, 0.24g of methacryloyloxyethyl trimethyl ammonium chloride and 0.02g of 4-ethyl benzene sodium sulfonate are added into a reactor with the volume of 500mL, and a first volume of deionized water is added into the reactor to prepare an aqueous solution with the mass concentration of 40%. Introducing nitrogen with the purity of 99.999% into a reactor, after 15min, respectively adding 0.105g of acetamide, 0.1575g of sodium salicylate, 0.125g of polyethylene glycol dimethacrylate, 0.05g of sodium formate, 0.0525g of azodiisobutylamine hydrochloride, 0.0437g of potassium thiosulfate and 0.008g of sodium formaldehyde sulfoxylate into the aqueous solution at the speed of 100r/min within 65min, and finally adding a second volume of deionized water to prepare a reaction system with the total volume of 500 mL. Controlling the temperature rise speed of the reactor to be 1 ℃/min, and setting the temperature control temperature difference of the reactor within 50 +/-1 ℃ when the temperature of the reactor reaches 50 ℃. The reaction liquid reacts for 3 hours at the temperature of 50 ℃ to obtain a reaction product. And drying and crushing the reaction product at 60 ℃ to obtain the thickening agent.
The viscosity average molecular weight of the thickener is 950 ten thousand measured by a light scattering method, and the chemical structural formula is as follows:
wherein x is 35000-45000, y is 80-200, and z is 10-55.
This example provides a thickener having a viscosity average molecular weight of 1100 ten thousand, which is prepared by the following method:
according to the mass ratio of each component, 197.810g of 3 monomers of 2-acrylamide-2-methyl propyl sodium sulfonate, 2.149g of methacryloyloxyethyl trimethyl ammonium chloride and 0.063g of 4-ethyl benzene sodium sulfonate are added into a reactor with the volume of 500mL, and a first volume of deionized water is added into the reactor to prepare an aqueous solution with the mass concentration of 45%. Introducing nitrogen with the purity of 99.999 percent into a reactor, after 15min, respectively adding 0.4g of acetamide, 0.1g of sodium salicylate, 0.2727g of polyethylene glycol dimethacrylate, 0.0273g of sodium formate, 0.1g of azodiisobutylamine hydrochloride, 0.0167g of potassium thiosulfate and 0.0833g of formaldehyde sodium sulfoxylate into the aqueous solution at the speed of 100r/min within 70min, and finally adding a second volume of deionized water to prepare a reaction system with the total volume of 500 mL. Controlling the temperature rise speed of the reactor to be 1 ℃/min, and setting the temperature control temperature difference of the reactor within 55 +/-1 ℃ when the temperature of the reactor reaches 55 ℃. The reaction liquid reacts for 3.5h at the temperature of 55 ℃ to obtain a reaction product. And drying and crushing the reaction product at 60 ℃ to obtain the thickening agent.
The viscosity average molecular weight of the thickener is 1100 ten thousand measured by a light scattering method, and the chemical structural formula is as follows:
wherein x is 40000-50000, y is 100-500, and z is 10-55.
This example provides a thickener having a viscosity average molecular weight of 1250 ten thousand prepared by the following method:
according to the mass ratio of each component, 221.677g of 3 monomers of 2-acrylamide-2-methyl propyl sodium sulfonate, 3.217g of methacryloyloxyethyl trimethyl ammonium chloride and 0.106g of 4-ethyl benzene sodium sulfonate are added into a reactor with the volume of 500mL, and a first volume of deionized water is added into the reactor to prepare an aqueous solution with the mass concentration of 45%. Introducing nitrogen with the purity of 99.999% into a reactor, after 15min, respectively adding 0.4688g of acetamide, 0.0937g of sodium salicylate, 0.1875g of polyethylene glycol dimethacrylate, 0.15g of sodium formate, 0.1125g of azodiisobutylamine hydrochloride, 0.15g of potassium thiosulfate and 0.03g of sodium formaldehyde sulfoxylate into the aqueous solution at the speed of 100r/min within 70min, and finally adding a second volume of deionized water to prepare a reaction system with the total volume of 500 mL. Controlling the temperature rise speed of the reactor to be 1 ℃/min, and setting the temperature control temperature difference of the reactor within 55 +/-1 ℃ when the temperature of the reactor reaches 55 ℃. The reaction liquid reacts for 4 hours at the temperature of 55 ℃ to obtain a reaction product. And drying and crushing the reaction product at 60 ℃ to obtain the thickening agent.
The viscosity average molecular weight of the thickener is 1250 ten thousand measured by a light scattering method, and the chemical structural formula is as follows:
wherein x is 50000-60000, y is 200-600, and z is 10-55.
It should be noted that, when the thickening agent is prepared in the examples of the present invention, the mass of the added agent is effective mass.
Application examples
This application example was tested on a viscosifying acid formulated with the viscosifying agent provided in example 3 of the specific examples.
307.5mL of industrial hydrochloric acid with the mass concentration of 31%, 15mL of high-concentration hydrochloric acid corrosion inhibitor for CT1-3 acidification, 15mL of corrosion inhibition synergist for CT1-5B acidification, 7.5mL of CT1-7 iron ion stabilizer, 5mL of CT5-9 cleanup additive and 2.0g of thickening agent prepared in the 3 rd embodiment are respectively added into a reaction vessel with the volume of 500mL, and finally deionized water is added to prepare a thickened acid system with the total volume of 500 mL.
The test shows that the swelling time of the thickening acid system is 15min, the normal-temperature apparent viscosity is 36mPa & s, and the resistance reduction rate reaches 67.3%. At 180 deg.C for 170s-1After 60min of shear, the viscosity of the thickening acid is 18 mPas, and the dynamic corrosion rate to the N80 steel sheet is 73.3g/m2H, can meet the construction requirements of the high-temperature underground deep well.
In conclusion, the thickening agent provided by the embodiment of the invention can reduce the frictional resistance between the thickening acid and the acid liquid pump and improve the high-temperature resistance of the thickening acid, and the thickening acid prepared by adopting the thickening agent can meet the construction requirement of a high-temperature underground well.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A thickener having the chemical formula:
wherein, x: y: the value of z is 35000-60000: 80-600: 10-55, wherein x, y and z are integers;
the viscosity average molecular weight of the thickening agent is 900-1300 ten thousand.
2. The thickening agent according to claim 1, wherein the raw materials for preparing the thickening agent comprise:
three monomers of 2-acrylamide-2-methyl propyl sodium sulfonate, methacryloyloxyethyl trimethyl ammonium chloride and 4-ethyl benzene sodium sulfonate;
the mass ratio of the 2-acrylamide-2-methylpropanesulfonic acid sodium salt to the methacryloyloxyethyl trimethyl ammonium chloride to the 4-ethyl benzene sodium sulfonate is 22924-11462: 311.55-20.77: 10.41-2.08.
3. The thickening agent according to claim 2, wherein the raw materials for preparing the thickening agent further comprise:
cosolvent, chain transfer agent, azo initiator and redox agent;
wherein the mass of the cosolvent is 0.10-0.25% of the total mass of the three monomers;
the mass of the chain transfer agent is 0.05-0.15% of the total mass of the three monomers;
the mass of the azo initiator is 0.01-0.05% of the total mass of the three monomers;
the mass of the redox agent is 0.01-0.08% of the total mass of the three monomers.
4. The thickening agent according to claim 3, wherein the cosolvent is a mixture of acetamide and sodium salicylate, and the mass ratio of acetamide to sodium salicylate is 1-4: 1 to 6.
5. The thickening agent according to claim 3, wherein the chain transfer agent is a mixture of polyethylene glycol dimethacrylate and sodium formate, and the mass ratio of the polyethylene glycol dimethacrylate to the sodium formate is 5-10: 1 to 4.
6. Thickener according to claim 3, wherein the azo initiator is azobisisobutyramidine hydrochloride.
7. The thickening agent according to claim 3, wherein the redox agent is a mixture of potassium thiosulfate and sodium formaldehyde sulfoxylate, and the mass ratio of the potassium thiosulfate to the sodium formaldehyde sulfoxylate is 1-5: 1 to 5.
8. A method for preparing the thickening agent according to any one of claims 1 to 7, wherein the method comprises:
adding three monomers, namely 2-acrylamide-2-methyl propyl sodium sulfonate, methacryloyloxyethyl trimethyl ammonium chloride and 4-ethyl benzene sodium sulfonate, into a reactor according to the mass ratio of the components, adding a first volume of deionized water into the reactor, and preparing to obtain an aqueous solution with the mass concentration of 30-45%;
introducing nitrogen with the purity of 99.999% into the reactor, respectively adding a cosolvent, a chain transfer agent, an azo initiator and a redox agent into the aqueous solution at a uniform stirring speed within a second time interval after the first time interval, and finally adding a second volume of deionized water to prepare a third volume of reaction liquid system;
the reaction liquid system reacts for 3 to 4 hours at the temperature of between 45 and 55 ℃ to obtain a reaction product;
and drying and crushing the reaction product at 60 ℃ to obtain the thickening agent.
9. The method of claim 8, wherein after preparing the third volume of the reaction solution system, the method further comprises:
controlling the temperature rise speed of the reactor to be 1 ℃/min, and setting the temperature control temperature difference of the reactor within +/-1 ℃ when the temperature of the reactor reaches 45-55 ℃.
10. Use of a thickener according to any of claims 1 to 7 in the preparation of a thickener.
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