CN115353870B - Self-degrading fracturing fluid thickener and preparation method thereof - Google Patents
Self-degrading fracturing fluid thickener and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a self-degrading fracturing fluid thickener and a preparation method thereof, and relates to the technical field of fracturing fluids used in petroleum exploitation processes, wherein the thickener is prepared from the following raw materials in percentage by mass: 10-20% of itaconic acid, 5-15% of acrylic acid, 2-8% of surface active monomer, 0.1-1% of chain extender, 10-30% of dispersing agent, 15-50% of stabilizer, 0.1-5% of auxiliary agent, 0.0001-0.1% of photoinitiator and the balance of water, wherein the total mass percentage of raw materials is 100%. The thickener has the self-degradation function at high temperature, the degraded fracturing fluid is a small molecular compound with very low molecular weight, the damage to stratum gaps is almost avoided, the fracturing fluid without flowback can not block an effective reservoir, and the decomposed product also has a certain wash oil yield increasing function.
Description
Technical Field
The invention relates to the technical field of fracturing fluid used in the petroleum exploitation process, in particular to a self-degrading fracturing fluid thickening agent and a preparation method thereof.
Background
Oil and gas energy is still one of the most dominant energy sources in the world today, and development of unconventional oil and gas reservoirs is also becoming deeper and larger. Especially for the development of dense oil reservoirs and shale gas, the development of the shale gas is more popular. The hydraulic fracturing technology is a mature and common technical means for increasing the yield of unconventional oil gas, and currently mainly adopts the fracturing fluid which is guanidine gum and derivatives thereof, namely vegetable gum fracturing fluid, viscoelastic surfactant fracturing fluid and synthetic polymer fracturing fluid, and mainly adopts the vegetable gum fracturing fluid, which accounts for about 90% of the whole fracturing market. Guanidine gum and its derivatives have strong thickening ability and good cross-linking property and salt and shear resistance, but all guanidine gum used in China and raw materials for producing guanidine gum derivatives depend on import, the price is unstable, and meanwhile, the guanidine gum has the problems of more residues, easy formation injury and the like. In addition, the fracturing fluid is often alkaline, and formation damage caused by dispersion and migration of clay particles is easy to occur to the stratum with high clay content. The viscoelastic surfactant fracturing fluid solves the problem that the vegetable gum fracturing fluid is harmful to the stratum, but cannot meet the requirements of high-temperature high-salt stratum fracturing construction, and is high in cost; the synthetic polymer has the advantages of easy regulation and control of structure, strong temperature resistance, salt resistance, shearing resistance, relatively low cost, complete dissolution, small damage to stratum and the like, and has become a research hotspot at home and abroad in the last decade.
Synthetic polymers involved in fracturing fluid research and application include polyacrylamides, partially hydrolyzed polyacrylamides, methylene polyacrylamides, polyvinyl alcohols, hydrophobically associating polymers and acrylamide copolymers, and are classified as dry powder and emulsion product types. Polyacrylamide is often used as a drag reducer in fracturing fluid slickwater, but as fracturing fluid sand-carrying fluid, high system viscosity is required to play a role in suspending and carrying proppants. The conventional guanidine gum or polymer thickener can meet the sand carrying requirement by preparing base liquid and then adding a metal cross-linking agent for cross-linking thickening. However, the preparation of the base solution in advance can cause the investment of a large amount of equipment on site and the investment in time, and meanwhile, the addition of various heavy metal ion crosslinking agents can cause the difficulty in breaking the gel after the gel solution enters the stratum, so that the gel breaking is insufficient, the oil and gas reservoir is blocked and damaged, and the subsequent reduction of the oil and gas yield is directly caused.
The low flowback rate of the fracturing fluid is always a great difficulty in domestic fracturing operation, the flowback rate of a domestic tight oil and gas reservoir is always between 20 and 40 percent, so that more than 60 percent of the fracturing fluid is not discharged back in the stratum, and the incomplete glue solution of the broken glue is retained in the stratum to form a plurality of organic scales to block the stratum, so that the oil and gas cannot be normally produced through a seepage channel. The rapid decrease of the later output of the domestic southwest shale gas is caused by the problems. Thus, the problem of formation damage caused by slickwater drag reducer is a serious concern for shale oil (gas) exploitation and continuous yield increase.
In order to solve the above problems, research and development personnel have conducted intensive studies. For example, a multi-element reversible cross-linked structural polymer APCF low-damage fracturing fluid system is disclosed in a paper of volume 31 in 3 months in 2014 of drilling fluid and completion fluid, and the fracturing fluid system has the characteristics of low construction friction, no residue after gel breaking, easiness in flowback, low damage to a reservoir and the like. Patent CN104877072B discloses a drag reducer of a fluorine-containing modified water-in-water high-flowback and low-damage slick fracturing fluid system, and the introduction of fluorine-containing groups reduces the affinity between molecules of the drag reducer and reservoir rocks, improves the drainage-assisting and reservoir protection performance after the hydraulic fracturing process, and solves the problems that the existing drag reducer blocks an oil gas channel and reduces daily output of oil gas.
However, the existing breaker is added in a slug mode at the later operation stage, so that the problem that the breaking of the front end of the fracturing fluid is incomplete is caused, and the front end fracturing fluid is just in the deep part of a crack and is in direct contact with oil gas, so that the damage to the stratum is large due to the incomplete breaking of the gel, and the yield of the oil gas is directly reduced.
Disclosure of Invention
The invention aims to solve the technical problems, provides the self-degrading fracturing fluid thickener and the preparation method thereof, provides the fracturing thickener which is quick in dissolution, quick in thickening, good in drag reduction performance and capable of degrading by itself, and simultaneously adopts a simple water-dispersible emulsion polymerization method, so that the self-degrading fracturing fluid thickener is suitable for large-scale production, low in cost and stable in product quality.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the invention aims at providing a self-degrading fracturing fluid thickener, which is prepared from the following raw materials in percentage by mass:
10-20% of itaconic acid, 5-15% of acrylic acid, 2-8% of surface active monomer, 0.1-1% of chain extender, 10-30% of dispersing agent, 15-50% of stabilizer, 0.1-5% of auxiliary agent, 0.0001-0.1% of photoinitiator and the balance of water, wherein the total mass percentage of raw materials is 100%.
Preferably, the thickener is prepared from the following raw materials in percentage by mass:
10-15% of itaconic acid, 5-10% of acrylic acid, 2-4% of surface active monomer, 0.1-0.5% of chain extender, 10-15% of dispersing agent, 20-30% of stabilizer, 0.1-0.5% of auxiliary agent, 0.05-0.1% of photoinitiator and the balance of water, wherein the total mass percentage of raw materials is 100%.
Preferably, the structural formula of the surface active monomer is as follows:
wherein n is 0-20, R is C12-C22 alkyl.
Preferably, the surface active monomer is prepared by the following method:
(1) Reacting sodium chloroethyl sulfonate with alkylamine in a solvent at 75-85 ℃ for 5-10h to obtain N-sodium alkyl ethyl sulfonate;
(2) Reacting the N-alkyl sodium ethanesulfonate with ethylene oxide at 10-40 ℃ for 10-16 hours to obtain N-alkyl-N-hydroxyethyl sodium ethanesulfonate;
(3) And (3) reacting the N-alkyl-N-hydroxyethyl-ethane sodium sulfonate with acrylic chloride in a solvent at 40-80 ℃ for 8-12h to obtain the surface active monomer.
The following scheme can be adopted specifically:
(1) Sodium chloroethyl sulfonate and C12-C22 alkylamine are mixed in a container provided with a stirrer, a thermometer, a condenser and a gas inlet and outlet according to a molar ratio of 1:1 are added into butanone solution to react for 5 to 10 hours at the temperature of 75 to 85 ℃ to prepare N-alkyl sodium ethanesulfonate;
(2) Then reacting N-alkyl sodium ethanesulfonate with ethylene oxide in a pressure vessel at 10-40 ℃ for 10-16h to obtain N-alkyl-N-hydroxyethyl sodium ethanesulfonate;
(3) In a container with a stirrer, a thermometer, a condenser and a gas inlet and outlet, the N-alkyl-N-hydroxyethyl-ethane sodium sulfonate and the acrylic chloride with the mol ratio of 1:1 are contacted and reacted in butanone solution at the temperature of 40-80 ℃ for 8-12 hours to prepare the surface active monomer.
Preferably, the chain extender is at least one of polyethylene glycol diacrylate (such as polyethylene glycol (200) diacrylate, polyethylene glycol (400) diacrylate, polyethylene glycol (600) diacrylate, polyethylene glycol (800) diacrylate), polyethylene glycol dimethacrylate (such as polyethylene glycol (200) dimethacrylate, polyethylene glycol (400) dimethacrylate, polyethylene glycol (600) dimethacrylate, polyethylene glycol (800) dimethacrylate).
Preferably, the dispersant is at least one of polyvinylbenzyl trimethyl ammonium chloride, polydimethyl diallyl ammonium chloride, sodium polymethacrylate, potassium polymethacrylate, sodium polyacrylate, potassium polyacrylate, sodium polyitaconic acid, potassium polyitaconic acid, polyacrylamide propyl trimethyl ammonium chloride, polymethacrylamidopropyl trimethyl ammonium chloride, polyacrylamidoethyl trimethyl benzyl ammonium chloride, polymethyl acryloyloxyethyl trimethyl benzyl ammonium chloride, poly 2-acrylamido-2-methylpropane sulfonate, acrylate and itaconate copolymer, methacrylate and itaconate copolymer, 2-acrylamido-2-methylpropane sulfonic acid and acrylate copolymer, 2-acrylamido-2-methylpropane sulfonic acid and methacrylate copolymer, 2-acrylamido-2-methylpropane sulfonic acid and itaconate copolymer, and polypyrrolidone, and the molecular weight of the dispersant is 1 to 100 ten thousand, preferably 5 to 30 ten thousand.
Preferably, the stabilizer is at least one of sodium chloride, ammonium bicarbonate, ammonium carbonate, ammonium sulfate, ammonium bisulfate, ferrous ammonium sulfate, potassium chloride, sodium sulfate, ammonium sulfamate, potassium bromide, sodium bromide, ethylene glycol, propylene glycol, and polyethylene glycol (such as polyethylene glycol 1000, polyethylene glycol 2000, and polyethylene glycol 4000).
Preferably, the auxiliary agent is at least one of sodium ethylenediamine tetraacetate, pentasodium diethylenetriamine pentaacetate, sodium hypophosphite, sodium phosphate, sodium hydrogen phosphate, sodium formate and sodium acetate.
Preferably, the photoinitiator is at least one of azodiisobutyl amidine hydrochloride, azodiisobutyronitrile, azodiiso Ding Mi hydrochloride, azodiisobutyronitrile, azodiisoheptonitrile, 2-hydroxy-4- (2-hydroxyethoxy) -2-methyl propiophenone, benzophenone, 4-chlorobenzophenone and 2-isopropylthioxanthone.
The second purpose of the invention is to provide a preparation method of the self-degrading fracturing fluid thickener, which comprises the following steps:
the components are added into a reaction kettle with a stirring and ultraviolet irradiation device according to the mass percentage, and the thickener is obtained by dispersion emulsion polymerization, wherein the stirring speed is 200-500rpm, and the wavelength of ultraviolet irradiation is 200-400nm, preferably 250-300nm.
By adopting the technical scheme, from the aspect of molecular design, the invention introduces the surface active monomer, and the unique ethoxyl ester structure contained in the structure can slowly hydrolyze under the action of stratum temperature so as to break chains, so that the primary decomposition is realized, the decomposed sulfoamine surfactant has good surface activity, the wettability of stratum pore throats can be well improved, and good oil washing capacity can be achieved, so that the fracturing fluid which fails to flow back is changed into an oil displacement agent. By introducing the chain extender with the diacid ester structure, the structure of the thickener polymer has a branched structure, and the apparent viscosity of the thickener can be greatly improved, so that the sand carrying capacity of the thickener is improved. Meanwhile, the acid ester structure can be slowly decomposed at the temperature of formation water, so that secondary decomposition is realized, and the polymer with huge molecular weight is decomposed into oligomer with smaller molecular weight. By introducing itaconic acid monomers, the full degradation capability can be realized, and the polymer taking itaconic acid as a main body can be effectively degraded by microorganisms such as bacteria in a water body, so that the fracturing fluid thickener synthesized by the method can realize the three-stage decomposition of the microorganisms after the two-stage decomposition.
By introducing various functional monomers, the integral self-degradation performance of the fracturing fluid thickener is improved. By letting the thickener have a three-level decomposition effect on three different scales, the self-degradation effect of the thickener achieved without the breaker is achieved. The self-degradation effect is much better than that of the traditional vegetable gum and polymer gel breaking agent. The degraded solution has very low viscosity, which shows that the degraded solution has almost no oligomer residue of the thickener, so that the problem of scale blockage caused by insufficient flowback rate of the fracturing solution to stay in the stratum can be avoided.
In addition, the invention also utilizes a relatively convenient water dispersion system to carry out photoinitiated polymerization, and has the advantages of low manufacturing cost of the water dispersion system and convenient and quick production process. The photoinitiated process also allows the polymer thickener to have the advantages of good solubility and narrow molecular weight distribution.
Drawings
FIG. 1 is a graph showing the shear rheology of the thickener prepared in example 1 at 110deg.C and 170s-1 in 1% potassium chloride brine.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings. The description of these embodiments is provided to assist understanding of the present invention, but is not intended to limit the present invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The raw materials used in the examples of the present invention are all commercial products.
Example 1
(1) Preparation of surface active monomers:
73.6g of sodium chloroethyl sulfonate, 72.0g of dodecyl amine and 300g of butanone are added into a 1L four-neck flask provided with a stirrer, a thermometer, a condenser and a gas inlet and outlet, and the mixture is heated to 80 ℃ under stirring to react for 6 hours to obtain the sodium N-dodecyl ethane sulfonate.
Then adding butanone solution containing 200g N-dodecyl sodium ethane sulfonate obtained in the previous step into a 1L pressure vessel, slowly introducing 45g of ethylene oxide at 15 ℃, reacting for 12 hours, evaporating the solvent, and then washing with methanol to obtain N-dodecyl-N-hydroxyethyl-sodium ethane sulfonate.
Finally, 88g of N-dodecyl-N-hydroxyethyl-ethane sodium sulfonate and 350g of butanone are added into a four-neck flask with a stirrer, a thermometer, a condenser and a gas inlet and outlet of 1L, the temperature is raised to 50 ℃ under stirring, 21.2g of acryloyl chloride is slowly added dropwise, and the surface active monomer is prepared after reaction for 10 hours.
(2) Preparation of thickener:
in a 1L four-neck flask equipped with a stirrer, a thermometer, a gas inlet and outlet and a 256nm ultraviolet irradiation device, 230g of deionized water, 90g of ammonium sulfate, 12g of polyethylene glycol 2000, 2.5g of sodium acetate and 55g of sodium polyacrylate are sequentially added to be stirred uniformly, the temperature is reduced to 10 ℃, then 60g of itaconic acid, 35g of acrylic acid, 18g of the surface active monomer prepared in the embodiment, 1.2g of polyethylene glycol (200) diacrylate, 0.23g of azo diisobutylamidine hydrochloride and 0.01g of 2-hydroxy-4- (2-hydroxyethoxy) -2-methyl propiophenone are added to be stirred uniformly, nitrogen is introduced for 30min, and then the ultraviolet irradiation device is started for polymerization reaction for 6h, so that the self-degradation fracturing fluid thickening agent is obtained.
Example 2
(1) Preparation of surface active monomers:
75g of sodium chloroethyl sulfonate, 86.5g of tetramine and 350g of butanone are added into a 1L four-neck flask provided with a stirrer, a thermometer, a condenser and a gas inlet and outlet, the temperature is raised to 80 ℃ under stirring, and the sodium N-tetradecyl ethanesulfonate is obtained after reaction for 8 hours.
Then adding butanone solution containing 220-g N-sodium tetradecyl ethanesulfonate obtained in the above step into a 1L pressure vessel, slowly introducing 41.5g of ethylene oxide at 15 ℃, reacting for 12 hours, evaporating the solvent, and then washing with methanol to obtain the sodium N-tetradecyl-N-hydroxyethyl-ethanesulfonate.
Finally, 90g of N-tetradecyl-N-hydroxyethyl-ethane sodium sulfonate and 350g of butanone are added into a four-neck flask with a stirrer, a thermometer, a condenser and a gas inlet and outlet of 1L, the temperature is raised to 60 ℃ under stirring, 22.6g of acryloyl chloride is slowly added dropwise, and the surface active monomer is prepared after reaction for 10 hours.
(2) Preparation of thickener:
225g of deionized water, 89g of ammonium sulfate, 11.5g of polyethylene glycol 1000, 2.2g of sodium formate and 50g of sodium polyacrylate are sequentially added into a 1L four-neck flask provided with a stirrer, a thermometer, a gas inlet and outlet and a 256nm ultraviolet irradiation device, uniformly stirred, cooled to 10 ℃, then 65g of itaconic acid, 30g of acrylic acid, 19.6g of the surface active monomer prepared in the embodiment, 1.2g of polyethylene glycol (200) diacrylate, 0.25g of azo diisobutylamidine hydrochloride and 0.02g of 2-hydroxy-4- (2-hydroxyethoxy) -2-methyl propiophenone are added, uniformly stirred, the stirring speed is 400rpm, nitrogen is introduced for 30min, and then the ultraviolet irradiation device is started, and the self-degradation fracturing fluid thickening agent is obtained after polymerization reaction for 6 h.
Example 3
(1) Preparation of surface active monomers:
72g of sodium chloroethyl sulfonate, 90g of hexadecylamine and 350g of butanone are added into a 1L four-neck flask provided with a stirrer, a thermometer, a condenser and a gas inlet and outlet, the temperature is raised to 80 ℃ under stirring, and the reaction is carried out for 8 hours to obtain the sodium N-hexadecyl ethanesulfonate.
Then adding butanone solution containing 240g N-hexadecyl sodium ethanesulfonate obtained in the above step into a 1L pressure vessel, slowly introducing 42g of ethylene oxide at 15 ℃, reacting for 12 hours, evaporating the solvent, and then washing with methanol to obtain N-hexadecyl-N-hydroxyethyl-ethanesulfonate sodium.
Finally, 86.5g of N-hexadecyl-N-hydroxyethyl-ethane sodium sulfonate and 350g of butanone are added into a 1L four-neck flask with a stirrer, a thermometer, a condenser and a gas inlet and outlet, the temperature is raised to 60 ℃ under stirring, 22.6g of acryloyl chloride is slowly added dropwise, and the surface active monomer is prepared after 10 hours of reaction.
(2) Preparation of thickener:
220g of deionized water, 110g of ammonium chloride, 22g of polyethylene glycol 1000, 1.2g of sodium formate and 60g of sodium polymethacrylate are sequentially added into a 1L four-neck flask provided with a stirrer, a thermometer, a gas inlet and outlet and a 256nm ultraviolet irradiation device, uniformly stirred, cooled to 10 ℃, then 50g of itaconic acid, 32g of acrylic acid, 20g of the surface active monomer prepared in the embodiment, 1.6g of polyethylene glycol (400) diacrylate, 0.25g of azo diisobutylamidine hydrochloride and 0.02g of 2-hydroxy-4- (2-hydroxyethoxy) -2-methyl propiophenone are added, uniformly stirred, nitrogen is introduced for 30min, and then the ultraviolet irradiation device is started for polymerization reaction for 6h, thus obtaining the self-degrading fracturing fluid thickening agent.
Example 4
220g of deionized water, 92g of ammonium sulfate, 10g of polyethylene glycol 4000, 2.5g of sodium acetate and 56g of sodium polyacrylate are sequentially added into a 1L four-neck flask provided with a stirrer, a thermometer, a gas inlet and outlet and a 256nm ultraviolet irradiation device, uniformly stirred, cooled to 10 ℃, then 58g of itaconic acid, 36g of acrylic acid, 20g of the surface active monomer prepared in the example 1, 1.5g of polyethylene glycol (400) diacrylate, 0.26g of azo diisobutylamidine hydrochloride and 0.02g of 2-hydroxy-4- (2-hydroxyethoxy) -2-methyl propiophenone are added, uniformly stirred, the stirring speed is 400rpm, nitrogen is introduced, then the ultraviolet irradiation device is started, and the self-degrading fracturing fluid thickener is obtained after polymerization reaction for 6 hours.
When the addition amount of the self-degrading fracturing fluid thickening agent prepared in the examples 1-4 in tap water is 0.1%, the fracturing fluid friction resistance tester produced by the sea-ampere petroleum scientific research instrument company is used for testing the resistivity of the self-degrading fracturing fluid thickening agent to fracturing fluid, the testing parameters are that the inner diameter is 10mm, the length is 2.5m, the discharge capacity is 12L/min, and the testing results are shown in table 1.
The self-degrading fracturing fluid thickener prepared in examples 1-4 was placed in a stainless steel hydration kettle, and then placed in a 110 ℃ oven, aged for 12 hours, taken out, tested for apparent viscosity, and test results are shown in table 1.
In order to better illustrate the harmless property of the thickener degradation liquid prepared in the embodiments 1-4 of the present invention to the stratum, the self-degradation liquid, guanidine gum and polyacrylamide gel breaking liquid with the molecular weight of 2000 ten thousand are subjected to detection injury, and the test results are shown in table 1. And the surface interfacial tension of the degradation liquid is tested.
TABLE 1
As can be seen from Table 1, the resistivity of the thickener prepared in the example of the present invention to the fracturing fluid is basically more than 70%, which is equivalent to the partially hydrolyzed polyacrylamide HPAM with more slickwater drag reducer commonly used at present, and greatly exceeds the resistivity of guanidine gum. Without any breaker, the viscosity after high temperature aging is very low, almost similar to water. Guanidine gum and HPAM are difficult to self-degrade and have very high viscosity after aging. From the damage experiment of the gel breaking liquid to the core, the damage of the self-degrading water-dispersible thickener to the core is extremely low and is less than 1%, the damage rate of the gel breaking liquid of the conventional guanidine gum and HPAM system to the core is very high and is more than 15%, and the oil gas to be produced in the stratum is blocked, so that the yield of the later-stage oil gas well is seriously influenced.
In order to more clearly demonstrate that the thickener provided by the invention has excellent rheological property and sand carrying property of the fracturing fluid, the thickener prepared in the example 1 is subjected to shear rheological property test. The Andopa high temperature high pressure rheometer is adopted for 170s -1 For 2 hours at the shear rate of (2), the test results are shown in FIG. 1.
As can be seen from FIG. 1, the thickener of the present invention also exhibits good thickening and shear properties at 110 ℃. Meanwhile, the thickener provided by the invention has good sand suspending performance under the condition of not adding a metal cross-linking agent, and static sand suspending experiments at a sand ratio of 30% show that the sedimentation rate after standing for 12 hours is less than 2%.
The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and yet fall within the scope of the invention.
Claims (10)
1. The self-degrading fracturing fluid thickener is characterized by being prepared from the following raw materials in percentage by mass:
10-20% of itaconic acid, 5-15% of acrylic acid, 2-8% of surface active monomer, 0.1-1% of chain extender, 10-30% of dispersing agent, 15-50% of stabilizer, 0.1-5% of auxiliary agent, 0.0001-0.1% of photoinitiator and the balance of water, wherein the total mass percentage of raw materials is 100%;
the structural formula of the surface active monomer is as follows:
wherein n is 0-20, R is C12-C22 alkyl;
the surface active monomer is prepared by the following method:
(1) Reacting sodium chloroethyl sulfonate with alkylamine in a solvent at 75-85 ℃ for 5-10h to obtain N-sodium alkyl ethyl sulfonate;
(2) Reacting the N-alkyl sodium ethanesulfonate with ethylene oxide at 10-40 ℃ for 10-16 hours to obtain N-alkyl-N-hydroxyethyl sodium ethanesulfonate;
(3) And (3) reacting the N-alkyl-N-hydroxyethyl-ethane sodium sulfonate with acrylic chloride in a solvent at 40-80 ℃ for 8-12h to obtain the surface active monomer.
2. The self-degrading fracturing fluid thickener according to claim 1, wherein the thickener is prepared from the following raw materials in percentage by mass:
10-15% of itaconic acid, 5-10% of acrylic acid, 2-4% of surface active monomer, 0.1-0.5% of chain extender, 10-15% of dispersing agent, 20-30% of stabilizer, 0.1-0.5% of auxiliary agent, 0.05-0.1% of photoinitiator and the balance of water, wherein the total mass percentage of raw materials is 100%.
3. The self-degrading fracturing fluid thickener of claim 1, wherein said chain extender is at least one of polyethylene glycol diacrylate and polyethylene glycol dimethacrylate.
4. The self-degrading fracturing fluid thickener of claim 1, wherein: the dispersing agent is at least one of polyvinyl benzyl trimethyl ammonium chloride, polydimethyl diallyl ammonium chloride, sodium polymethacrylate, potassium polymethacrylate, sodium polyacrylate, potassium polyacrylate, sodium polyitaconic acid, potassium polyitaconic acid, polyacrylamide propyl trimethyl ammonium chloride, polymethyl acrylamide propyl trimethyl ammonium chloride, polyacrylic acyloxy ethyl trimethyl benzyl ammonium chloride, polymethyl acryloyloxy ethyl trimethyl benzyl ammonium chloride, poly 2-acrylamido-2-methylpropane sulfonate, acrylic acid salt and itaconic acid salt copolymer, methacrylic acid salt and itaconic acid salt copolymer, 2-acrylamido-2-methylpropane sulfonic acid and acrylic acid salt copolymer, 2-acrylamido-2-methylpropane sulfonic acid and methacrylic acid salt copolymer, 2-acrylamido-2-methylpropane sulfonic acid and itaconic acid salt copolymer and polypyrrolidone, and the molecular weight of the dispersing agent is 1-100 ten thousand.
5. The self-degrading fracturing fluid thickener of claim 1, wherein: the molecular weight of the dispersing agent is 5-30 ten thousand.
6. The self-degrading fracturing fluid thickener of claim 1, wherein: the stabilizer is at least one of sodium chloride, ammonium bicarbonate, ammonium carbonate, ammonium sulfate, ammonium bisulfate, ammonium ferrous sulfate, potassium chloride, sodium sulfate, ammonium sulfamate, potassium bromide, sodium bromide, ethylene glycol, propylene glycol and polyethylene glycol.
7. The self-degrading fracturing fluid thickener of claim 1, wherein: the auxiliary agent is at least one of sodium ethylenediamine tetraacetate, diethylene triamine pentaacetate, sodium hypophosphite, sodium phosphate, sodium hydrogen phosphate, sodium formate and sodium acetate.
8. The self-degrading fracturing fluid thickener of claim 1, wherein: the photoinitiator is at least one of azodiisobutyl amidine hydrochloride, azodiisobutyronitrile, azodiiso Ding Mi hydrochloride, azodiisoheptonitrile, 2-hydroxy-4- (2-hydroxyethoxy) -2-methyl propiophenone, diphenyl ketone, 4-chlorobenzophenone and 2-isopropylthioxanthone.
9. A method for preparing the self-degrading fracturing fluid thickener according to any of claims 1 to 8, wherein the method comprises the following steps:
the components are added into a reaction kettle with a stirring and ultraviolet irradiation device according to the mass percentage, and the thickener is obtained by dispersion emulsion polymerization, wherein the stirring speed is 200-500rpm, and the wavelength of ultraviolet irradiation is 200-400nm.
10. The method for preparing the self-degrading fracturing fluid thickener according to claim 9, wherein the method comprises the following steps: the wavelength of the ultraviolet light irradiation is 250-300nm.
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