CN112724316B - Salt-tolerant temperature-resistant multipurpose thickening agent for shale gas reservoir volume reconstruction and preparation method thereof - Google Patents
Salt-tolerant temperature-resistant multipurpose thickening agent for shale gas reservoir volume reconstruction and preparation method thereof Download PDFInfo
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Abstract
The invention provides a salt-tolerant temperature-tolerant multipurpose shale gas reservoir volume modification thickening agent and a preparation method thereof. The preparation method of the thickening agent comprises the following steps: adding the quinary copolymer and water into a reaction kettle for dissolving, adding an azo initiator, and adjusting the pH value; reducing the temperature of the reaction kettle to 4-6 ℃, and introducing nitrogen to remove oxygen; reducing the temperature of the reaction kettle to 1-3 ℃, and adding a molecular regulator; adding a redox initiator after introducing nitrogen and removing oxygen, stopping cooling the reaction kettle, introducing nitrogen and removing oxygen; and (5) preserving the heat after the reaction kettle reaches the highest reaction temperature to obtain the product. The thickening agent prepared by the invention is environment-friendly and easy to degrade, can be used as a slickwater, linear glue and gel fracturing fluid system required by shale gas reservoir volume reconstruction only by changing the concentration, is low in consumption, and has good salt and temperature resistant effects.
Description
Technical Field
The invention relates to the technical field of oil testing engineering, in particular to a salt-tolerant temperature-tolerant multipurpose thickening agent for shale gas reservoir volume reformation and a preparation method thereof.
Background
The volume transformation is an important means for the development of shale gas resources at present, and a mixed fracturing fluid mode which takes emulsion with low viscosity, resistance reduction and slick water as a main body and takes linear gel and cross-linked gel as auxiliary bodies is mostly adopted. Compared with the traditional fracturing mode, the mixed fracturing fluid shows good transformation effect in the application process, but also shows a series of production problems: for example, the process flow is complicated due to different core additives, and when multi-system composite fracturing is performed, due to the different core additives, the conversion between systems can be realized only by performing flow switching during field construction, so that the process flow is complicated, and manpower resources and additive materials are unnecessarily wasted.
Chinese patent application publication No. CN107739422A, 2/27 in 2018, discloses a betaine type zwitterionic polymer oil-displacing agent and a synthesis method thereof, wherein the zwitterionic copolymer is obtained by polymerizing 80 parts of acrylamide, 18 parts of acrylic acid, 1 part of 3- (3-methacrylamidopropyldimethylamino) propyl-1-sulfonate and 0.3 part of N-allyl-2-phenoxyacetamide as monomers, and 0.2-0.8 part of azobisisobutyramidine hydrochloride as an initiator with 0.5mol/L sodium chloride solution at pH of 5-9 and 50 ℃ for 2-5 hours. The zwitterionic copolymer resists temperature of 110 ℃; the thickening agent and the structural reinforcing agent are synthesized twice, so that the synthesis cost is high; the liquid preparation on site is complex and the use cost is high.
The Chinese patent application with publication number CN111635489A, 9/8 of 2020, discloses a multifunctional supramolecular thickening agent and a preparation method thereof, wherein the multifunctional supramolecular thickening agent is synthesized by hydrophilic nonionic macromonomers, cationic monomers, anionic monomers and solvents, is suitable for oil and gas reservoirs with the temperature of 150 ℃, and can be used as a multipurpose thickening agent in thickening fluids such as hydrophobic associated complex fracturing fluid, slickwater fracturing fluid, thickening acid fluid and the like. The thickening agent has high molecular weight reaching 60-80 ten thousand, is not easy to degrade, has no salt-resistant group and poor salt resistance at the applicable temperature of 150 ℃, and the prepared fracturing fluid system has the mass concentration of 0.2-2% and larger use concentration.
Disclosure of Invention
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art.
The inventor finds out through research that a multifunctional thickening agent needs to be researched and developed urgently, can be used as slickwater, linear glue and cross-linked gel fracturing fluid systems only by changing the using amount, and can directly prepare a high-salinity (30000-70000 ppm) flowback fluid to achieve the purpose of recycling the fracturing flowback fluid; in addition, with the gradual development of deep shale gas, the well temperature of part of deep shale gas wells also reaches more than 120 ℃, and the temperature resistance of the multifunctional thickening agent needs to be improved to more than 150 ℃ so as to meet the production requirement.
In view of the above, one of the objectives of the present invention is to design a molecular structure of a shale gas fracturing fluid according to performance characteristics of the shale gas fracturing fluid, preferably select a suitable side chain monomer, introduce a salt-resistant group, and form a novel multipurpose thickener for shale gas reservoir volume reformation through a synthesis test and performance evaluation, particularly a multipurpose thickener for shale gas reservoir volume reformation, which is suitable for salt tolerance (for example, salt tolerance can reach about 50000 ppm) and temperature tolerance (for example, temperature tolerance can reach about 150 ℃), and a preparation method and a multipurpose use method thereof.
In order to achieve the above purpose, one aspect of the invention provides a preparation method of a thickening agent for reforming the volume of a salt-tolerant temperature-resistant multipurpose shale gas reservoir, wherein a quinary copolymer is used as a raw material, and the quinary copolymer is composed of 65.5-70.5 parts by mass of a hydrophilic monomer, 1.5-2.0 parts by mass of a cationic monomer, 25.0-30.0 parts by mass of a first anionic monomer, 1.1-1.5 parts by mass of a second anionic monomer and 0.5-2.0 parts by mass of a supramolecular monomer. The supermolecule monomer is a mixture formed by mixing hexadecyl dimethyl allyl ammonium chloride and octadecyl dimethyl allyl ammonium chloride according to the mass ratio of 2.7: 1-3.3: 1.
The preparation method comprises the following steps: adding the quinary copolymer and water into a reaction kettle, dissolving to form 25-30% aqueous solution by mass, adding an azo initiator, and adjusting the pH value to 7.55-7.65; reducing the temperature of the reaction kettle to a first temperature, introducing nitrogen to remove oxygen; reducing the temperature of the reaction kettle to a second temperature, and adding a molecular regulator; adding a redox initiator after introducing nitrogen and removing oxygen, stopping cooling the reaction kettle, and introducing nitrogen and removing oxygen; and preserving heat after the highest reaction temperature in the reaction kettle is reached to prepare the thickening agent for modifying the volume of the salt-resistant and temperature-resistant multipurpose shale gas reservoir. Wherein the first temperature is 4-6 ℃, and the second temperature is 1-3 ℃.
In an exemplary embodiment of the present invention, the azo initiator is azobisisobutyronitrile, and may be added in an amount of 0.15 to 0.20% by mass of the total mass of the pentabasic copolymer. In addition, the molecular regulator is sodium hypophosphite, the addition amount of the molecular regulator can be 0.003 to 0.004 percent of the total mass of the five-membered copolymer, the redox initiator is sodium formaldehyde sulfoxylate and ammonium persulfate, and the addition amount of the redox initiator can be respectively 0.005 to 0.02 percent and 0.01 to 0.05 percent of the total mass of the five-membered copolymer.
According to another aspect of the invention, the multipurpose salt-tolerant and temperature-tolerant shale gas reservoir volume reformation thickening agent is prepared by any one of the preparation methods.
In an exemplary embodiment of the invention, the slippery water system prepared by the thickener for modifying the volume of the salt-resistant and temperature-resistant multipurpose shale gas reservoir can be 0.01-0.03% in mass concentration. In addition, the slickwater system can be directly prepared by 30000-70000 ppm of high-salinity water. The linear gel system is prepared by the thickening agent for reforming the volume of the salt-resistant and temperature-resistant multipurpose shale gas reservoir, and the mass concentration of the thickening agent can be 0.15-0.25%. The gel system is prepared by the thickening agent for modifying the volume of the salt-tolerant and temperature-tolerant multipurpose shale gas reservoir, and the mass concentration of the thickening agent can be 0.3-0.5%.
Compared with the prior art, the invention has the beneficial effects that: the product is more environment-friendly as a whole, is easy to degrade and reaches the non-toxic standard (EC50 is more than 1000000 mg/L); the construction process is greatly simplified, compared with the conventional emulsion resistance reducing agent, the dosage is reduced by more than 70 percent, and the cost for preparing the slickwater fracturing fluid of each formula is reduced by more than 50 percent; the method can adopt 30000-70000 ppm of high-salinity flowback liquid or water to prepare a slick water system, and the prepared jelly system can resist the temperature of 150-160 ℃.
Drawings
Fig. 1 shows a flow chart of an exemplary embodiment of the production method of the present invention.
Figure 2 shows the drag reduction performance curve for the product of example 1 formulated with 50000ppm salinity water to form a system useful as slickwater.
Figure 3 shows the drag reduction performance curve for the product of example 1 used as a linear gum system.
Figure 4 shows the temperature and shear resistance curves for the product of example 1 used as a jelly system.
Figure 5 shows the drag reduction performance curve for the product of example 2 used as a slickwater system.
Detailed Description
Hereinafter, the salt-resistant temperature-resistant multipurpose shale thickener for gas reservoir volume reformation and the preparation method thereof according to the present invention will be described in detail with reference to the exemplary embodiments. Herein, "first," "second," and the like are for convenience of description and for convenience of distinction only and are not to be construed as indicating or implying relative importance or order of any strict order.
The term "salt tolerance" as used herein means that the content of monovalent ions and divalent ions (for example, sodium ions, potassium ions, chloride ions, calcium ions, magnesium ions, etc.) capable of forming salts, contained in a fracturing fluid system (for example, slickwater, linear gel, and jelly) prepared by using the thickener of the present invention, is 30000 to 70000 ppm; the term "temperature resistance" means that the fracturing fluid system prepared from the thickening agent, such as a gel system, can withstand a temperature of 150-160 ℃.
Fig. 1 shows a flow chart of an exemplary embodiment of the production method of the present invention.
As shown in fig. 1, the preparation method of the thickener for reforming the volume of the salt-resistant and temperature-resistant multipurpose shale gas reservoir comprises the following steps:
(1) adding the pentamer copolymer and water into a reaction kettle, adding an azo initiator, and adjusting the pH
Specifically, a quinary copolymer raw material is added into a reaction kettle, a proper amount of water is added to dissolve the raw material to form an aqueous solution with the mass fraction of 25-30%, an azo initiator is added, and the pH value is adjusted to 7.55-7.65.
The pentapolymer raw material comprises 65.5-70.5 parts by mass of hydrophilic monomer, 1.5-2.0 parts by mass of cationic monomer, 25.0-30.0 parts by mass of first anionic monomer, 1.1-1.5 parts by mass of second anionic monomer and 0.5-2.0 parts by mass of supramolecular monomer. The hydrophilic monomer is acrylamide, the cationic monomer is acryloyloxyethyl trimethyl ammonium chloride, the first anionic monomer is sodium acrylate, the second anionic monomer is 2-acrylamide-2-methylpropanesulfonic acid, and the supermolecule monomer is a mixture formed by mixing hexadecyl dimethyl allyl ammonium chloride and octadecyl dimethyl allyl ammonium chloride according to the mass ratio of 2.7: 1-3.3: 1. The azo initiator is azobisisobutyronitrile. The adding amount is 0.15 to 0.20 percent of the total mass of the quinary copolymer. In the invention, the combination and the proportion of the five-membered copolymer raw materials mutually influence each other, and are determined by comprehensively considering factors such as salt resistance, temperature resistance, instant dissolution within 2min, cost and the like. In addition, the hydrophilic monomer is in the range of 65.5-70.5, so that the expected moisture resistance and solubility are mainly obtained, the construction requirement of instant dissolution within 2min cannot be met when the hydrophilic monomer is less than 65.5, and the hydrophilic monomer is easily damped when the hydrophilic monomer is more than 70.5. The cationic monomer is used in the range of 1.5-2.0, which is mainly beneficial to improving the salt resistance of the thickening agent, the range of 1.5-2.0 can meet the requirements of the mineralization resistance of 50000ppm, even 70000ppm, the production cost can be increased and the product dissolution speed can be reduced by continuously increasing the addition. The range of 25.0-30.0 is adopted for the first anionic monomer, and the range of 1.1-1.5 is adopted for the second anionic monomer, so that the temperature resistance of the thickening agent is improved, and the temperature resistance and the cost of the thickening agent can be comprehensively considered. The supermolecule monomer is in the range of 0.5-2.0, so that the shear resistance and temperature stability of the thickening agent are improved, and the shear resistance, temperature stability and cost of the thickening agent can be comprehensively considered.
The reaction kettle is a reaction kettle in a broad sense, has different volumes, and can realize the functions of temperature measurement, sealing, heating, temperature reduction, heat preservation, material feeding, stirring, ventilation, pressure resistance and the like required in preparation. In addition, the water here may be deionized water.
(2) After cooling, nitrogen is introduced to remove oxygen
Specifically, the temperature in the reaction vessel was lowered to a first temperature, and then nitrogen gas was introduced into the reaction vessel to remove oxygen. The second temperature here may be 4 to 6 ℃.
(3) Adding molecular regulator after cooling
Specifically, the temperature in the reaction vessel is lowered to a second temperature, and then a molecular regulator is added to the reaction vessel. The molecular regulator is sodium hypophosphite, and the addition amount of the molecular regulator can be 0.003-0.004 percent of the total mass of the quinary copolymer. The second temperature here may be 1 to 3 ℃.
(4) Adding redox agent after nitrogen is introduced and oxygen is removed, stopping cooling, introducing nitrogen and removing oxygen
Specifically, after nitrogen is introduced for deoxygenation, a redox initiator is added, the reaction kettle is stopped from being cooled, and then nitrogen is introduced to fully deoxygenate the reaction kettle. The oxidation reducing agent is sodium formaldehyde sulfoxylate and ammonium persulfate, and the addition amount of the oxidation reducing agent is 0.005-0.02 percent and 0.01-0.05 percent of the total mass of the five-membered copolymer respectively.
After the redox agent is added, the temperature of the reaction kettle is required to be immediately stopped to be reduced, and the processes of stopping the temperature reduction of the reaction kettle and introducing nitrogen for the second time to remove oxygen can be carried out simultaneously without any sequence; or may be performed sequentially.
(5) Keeping the temperature after reaching the highest reaction temperature to obtain the product
Specifically, the temperature in the reaction kettle is monitored in real time in the reaction process, and the maximum temperature is kept after the temperature reaches the maximum temperature, so that the salt-resistant and temperature-resistant multipurpose thickening agent for shale gas reservoir volume reformation is prepared.
It should be noted that, the introduction of nitrogen for deoxygenation is a routine operation in the field, and the present invention is not described in detail.
In another exemplary embodiment of the invention, the thickening agent for reforming the volume of the salt-resistant and temperature-resistant multipurpose shale gas reservoir can be also realized by the following steps:
1) adding the quinary copolymer and water into a reaction kettle, dissolving to form 25-30% of water solution by mass, adding azobisisobutyronitrile as an azo initiator, wherein the adding amount is 0.15-0.20% of the total mass of the quinary copolymer, and adjusting the pH value to 7.55-7.65;
the pentabasic copolymer comprises 65.5-70.5 parts by mass of acrylamide, 1.5-2.0 parts by mass of acryloyloxyethyl trimethyl ammonium chloride, 25.0-30.0 parts by mass of sodium acrylate, 1.1-1.5 parts by mass of 2-acrylamide-2-methylpropanesulfonic acid, and 0.5-2.0 parts by mass of a mixture formed by mixing hexadecyl dimethyl allyl ammonium chloride and octadecyl dimethyl allyl ammonium chloride according to a mass ratio of 2.7: 1-3.3: 1;
2) reducing the temperature of the reaction kettle to 4-6 ℃, and introducing nitrogen to remove oxygen;
3) reducing the temperature of the reaction kettle to 1-3 ℃, adding sodium hypophosphite serving as a molecular regulator, wherein the adding amount is 0.003-0.004 percent of the total mass of the quinary copolymer;
4) introducing nitrogen to remove oxygen, adding sodium formaldehyde sulfoxylate and ammonium persulfate as redox initiators, wherein the addition amounts of the sodium formaldehyde sulfoxylate and the ammonium persulfate are 0.005-0.02 percent and 0.01-0.05 percent of the total mass of the five-membered copolymer respectively, then stopping cooling the reaction kettle, and introducing nitrogen to further remove oxygen;
5) and (3) after the temperature in the reaction kettle is monitored to reach the highest temperature, heat preservation is carried out for 1 hour for granulation, then drying and powder preparation are carried out, and finally the thickening agent for modifying the volume of the salt-tolerant and temperature-tolerant multipurpose shale gas reservoir can be prepared by sieving with a 100-mesh sieve.
The thickening agent for reforming the volume of the salt-resistant and temperature-resistant multipurpose shale gas reservoir prepared in the exemplary embodiment passes through a 100-mesh sieve, so that the thickening agent can be dissolved within 2min when each fracturing fluid system is prepared, the preparation and the use are realized immediately, and the problem that the thickening agent can be used after waiting for a long time is solved.
The invention further discloses the thickening agent for reforming the volume of the salt-resistant and temperature-resistant multipurpose shale gas reservoir and the preparation method thereof by detailed examples.
Example 1
The thickening agent for reforming the volume of the salt-resistant and temperature-resistant multipurpose shale gas reservoir is produced according to 200kg, and the preparation method comprises the following steps:
adding 500kg of deionized water into a reaction kettle, and then adding 2kg of a mixture of 132kg of acrylamide, 3kg of acryloyloxyethyl trimethyl ammonium chloride, 60kg of sodium acrylate, 3kg of 2-acrylamide-2-methylpropanesulfonic acid, hexadecyl dimethyl allyl ammonium chloride and octadecyl dimethyl allyl ammonium chloride in a mass ratio of 3: 1; adding 0.3kg of azodiisobutyronitrile, and adjusting the pH value to 7.58; reducing the temperature of the reaction kettle to 5 ℃, and introducing nitrogen for 20-30 min to remove oxygen; when the temperature of the reaction kettle is reduced to 2 ℃, 0.006kg of sodium hypophosphite is added; introducing nitrogen for 10 minutes, adding 0.01kg of sodium formaldehyde sulfoxylate and 0.02kg of ammonium persulfate, stopping cooling the reaction kettle, adjusting the nitrogen to be large, and continuously introducing nitrogen until the nitrogen cannot be introduced again; monitoring the temperature in the reaction kettle to reach the maximum temperature, and then keeping the temperature for 1 hour and then starting granulation; drying, pulverizing into powder, and sieving with 100 mesh sieve to obtain the final product.
A product is prepared into a slick water system, the mass concentration is 0.02 percent, and the resistance reduction rate is 74.5 percent; 50000ppm of mineralization water is used for preparing a slick water system, the mass concentration is 0.03%, and the drag reduction rate of the slick water system is more than or equal to 70%; preparing a linear adhesive system, wherein the mass concentration is 0.15%, the apparent viscosity is 25mPa.s, and the resistance reduction rate is 68%; preparing a jelly system, wherein the mass concentration is 0.3%, and the jelly system can be continuously sheared for 60min at 170s-1 when the jelly system resists the temperature of 150 ℃, and the viscosity is 77 mPa.s.
Example 2
The thickening agent for reforming the volume of the salt-resistant and temperature-resistant multipurpose shale gas reservoir is produced according to 200kg, and the preparation method comprises the following steps:
adding 500kg of clear water into a reaction kettle, and then adding 4kg of a mixture of 140kg of acrylamide, 3kg of acryloyloxyethyl trimethyl ammonium chloride, 50kg of sodium acrylate, 3kg of 2-acrylamide-2-methylpropanesulfonic acid, hexadecyl dimethyl allyl ammonium chloride and octadecyl dimethyl allyl ammonium chloride according to the mass ratio of 3: 1; adding 0.32kg of azodiisobutyronitrile, and adjusting the pH value to 7.60; reducing the temperature of the reaction kettle to 5 ℃, and introducing nitrogen for 20-30 min to remove oxygen; when the temperature of the reaction kettle is reduced to 2 ℃, 0.006kg of sodium hypophosphite is added; after nitrogen is introduced for 10 minutes, 0.015kg of sodium formaldehyde sulfoxylate and 0.03kg of ammonium persulfate are added, the reaction kettle is stopped from cooling, the nitrogen is increased, and the nitrogen is continuously introduced until the nitrogen cannot be introduced again; monitoring the temperature in the reaction kettle to reach the maximum temperature, and then keeping the temperature for 1 hour and then starting granulation; drying, pulverizing into powder, and sieving with 100 mesh sieve to obtain the final product.
A product is prepared into a slick water system, the mass concentration is 0.02 percent, and the drag reduction rate is 75.5 percent; preparing a linear adhesive system, wherein the mass concentration is 0.15%, the apparent viscosity is 24.5mPa.s, and the resistance reduction rate is 66.5%; and preparing a jelly system, wherein the mass concentration is 0.3%, the jelly system can resist temperature of more than 150 ℃, the jelly system can be continuously sheared for 60min within 170s-1, and the viscosity is 73 mPa.s.
FIG. 2 is a plot of drag reduction performance of the product of example 1 formulated to form a slickwater system using 50000ppm mineralized water, using a product mass concentration of 0.03% and a slickwater system drag reduction of greater than or equal to 70%. FIG. 3 is a plot of the drag reduction performance of the linear gum system formed by formulating the product of example 1 using a product mass concentration of 0.15%, an apparent viscosity of greater than or equal to 20mPa.s, and a drag reduction rate of greater than or equal to 65%. FIG. 4 is a temperature and shear resistance curve of a jelly system formed by formulating the product of example 1, wherein the mass concentration of the product used is 0.3%, the jelly system is continuously sheared for 60min at 170s-1 when tested at a temperature of 150 ℃, and the viscosity is not less than 70 mPa.s. FIG. 5 is a plot of the drag reduction performance of the slickwater system formulated with the product of example 2 using a product mass concentration of 0.02% and a drag reduction of greater than or equal to 70%.
In conclusion, the thickening agent for reforming the volume of the salt-resistant and temperature-resistant multipurpose shale gas reservoir prepared by the invention has the beneficial effects that:
1) compared with the conventional emulsion resistance reducing agent, the emulsion resistance reducing agent does not contain white oil; and the high-efficiency drag reduction can be realized only by small molecular weight by utilizing a trace amount of supermolecule acting monomers; the reduction of molecular weight is also beneficial to the improvement of conversion rate, the content of harmful monomers which are not completely converted is greatly reduced, the product can be instantly dissolved within 2min, the whole product is more environment-friendly and easy to degrade, and the product reaches the non-toxic standard (EC50 is more than 1000000 mg/L).
2) The thickening agent can be used as all 3 fracturing fluid systems required by shale gas reservoir volume transformation, namely slickwater, linear gel and jelly glue, by changing the concentration, the sand carrying capacity is improved, and meanwhile, the construction process is greatly simplified; compared with the conventional emulsion resistance reducing agent, the dosage is reduced by more than 70 percent, and the cost for preparing each formula of slickwater fracturing fluid is reduced by more than 50 percent.
3) The raw materials used in the preparation method are preferably proper side chain monomers, salt-resistant groups are introduced, and the prepared thickening agent can be prepared into a slickwater system directly by adopting 30000-70000 ppm of high-salinity water; the temperature resistance of the prepared jelly system can reach 150-160 ℃.
Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described exemplary embodiments without departing from the spirit and scope of the claims.
Claims (9)
1. The preparation method of the multipurpose thickening agent for modifying the volume of the salt-resistant and temperature-resistant shale gas reservoir is characterized in that a quinary copolymer is used as a raw material, wherein the quinary copolymer is composed of 65.5-70.5 parts by mass of a hydrophilic monomer, 1.5-2.0 parts by mass of a cationic monomer, 25.0-30.0 parts by mass of a first anionic monomer, 1.1-1.5 parts by mass of a second anionic monomer and 0.5-2.0 parts by mass of a supermolecule monomer, wherein the hydrophilic monomer is acrylamide; the cationic monomer is acryloyloxyethyl trimethyl ammonium chloride; the first anionic monomer is sodium acrylate; the second anionic monomer is 2-acrylamide-2-methylpropanesulfonic acid; the supermolecule monomer is a mixture formed by mixing hexadecyl dimethyl allyl ammonium chloride and octadecyl dimethyl allyl ammonium chloride according to the mass ratio of 2.7: 1-3.3: 1;
the preparation method comprises the following steps:
adding the quinary copolymer and water into a reaction kettle, dissolving to form 25-30% aqueous solution by mass, adding an azo initiator, and adjusting the pH value to 7.55-7.65;
reducing the temperature of the reaction kettle to a first temperature, introducing nitrogen to remove oxygen;
reducing the temperature of the reaction kettle to a second temperature, and adding a molecular regulator;
adding a redox initiator after introducing nitrogen and removing oxygen, stopping cooling the reaction kettle, introducing nitrogen and removing oxygen;
preserving heat after the highest reaction temperature in the reaction kettle is reached to prepare the salt-tolerant and temperature-tolerant thickening agent for modifying the volume of the multipurpose shale gas reservoir;
wherein the first reaction temperature is 4-6 ℃, the second reaction temperature is 1-3 ℃, and the azo initiator is azobisisobutyronitrile; the molecular regulator is sodium hypophosphite; the redox initiator is sodium formaldehyde sulfoxylate and ammonium persulfate.
2. The preparation method of the thickening agent for reforming the volume of the salt-resistant and temperature-resistant multipurpose shale gas reservoir as claimed in claim 1, wherein the azo initiator is azobisisobutyronitrile, and the addition amount is 0.15-0.20% of the total mass of the penta-copolymer.
3. The preparation method of the thickening agent for the volume reformation of the salt-resistant and temperature-resistant multipurpose shale gas reservoir as claimed in claim 1, wherein the molecular regulator is sodium hypophosphite, and the addition amount of the molecular regulator is 0.003-0.004 percent of the total mass of the quinary copolymer.
4. The preparation method of the thickening agent for reforming the volume of the salt-resistant and temperature-resistant multipurpose shale gas reservoir according to claim 1, wherein the redox initiator is sodium formaldehyde sulfoxylate and ammonium persulfate, and the addition amounts of the redox initiator are 0.005-0.02% and 0.01-0.05% of the total mass of the five-membered copolymer respectively.
5. The multipurpose thickening agent for reforming the volume of the salt-tolerant and temperature-tolerant shale gas reservoir is characterized by being prepared by the preparation method according to any one of claims 1 to 4.
6. A slickwater system prepared by the thickener for modifying the volume of the salt-resistant and temperature-resistant multipurpose shale gas reservoir as claimed in claim 5, wherein the mass concentration of the thickener in the slickwater system is 0.01-0.03%.
7. The slickwater system prepared from the thickening agent for modifying the volume of the salt-resistant and temperature-resistant multipurpose shale gas reservoir according to claim 6 is characterized in that the thickening agent can be directly prepared into slickwater system fracturing fluid from 30000-70000 ppm of high-salinity water.
8. The linear gel system prepared by the thickener for the volume reformation of the salt-tolerant temperature-resistant multipurpose shale gas reservoir as claimed in claim 5, wherein the mass concentration of the thickener in the linear gel system is 0.15-0.25%.
9. The jelly glue system prepared by the thickener for the volume reformation of the salt-tolerant temperature-tolerant multipurpose shale gas reservoir as claimed in claim 5, wherein the mass concentration of the thickener in the jelly glue system is 0.3-0.5%.
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