CN113652221B - Fracturing fluid for enhancing treatment efficiency of polycyclic aromatic hydrocarbon in hypotonic soil and preparation method thereof - Google Patents
Fracturing fluid for enhancing treatment efficiency of polycyclic aromatic hydrocarbon in hypotonic soil and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a fracturing fluid for enhancing treatment efficiency of polycyclic aromatic hydrocarbon in hypotonic soil and a preparation method thereof. The fracturing fluid can carry out hydraulic fracturing on the hypotonic soil polluted by the polycyclic aromatic hydrocarbon and simultaneously carries out in-situ chemical oxidation treatment on the polycyclic aromatic hydrocarbon, so that the removal rate of polycyclic aromatic hydrocarbon pollutants in the hypotonic soil can be improved. The waste slag and the steel slag in industrial production are selected as propping agents, so that the method is environment-friendly, saves the cost and improves the utilization rate of waste resources. The fracturing fluid also has the characteristics of small damage to soil, difficult secondary pollution generation, simple preparation process, easy popularization and application and the like. The product can be widely applied to the field of in-situ remediation of polycyclic aromatic hydrocarbon pollutant soil.
Description
Technical Field
The invention relates to the technical field of hydraulic fracturing of soil, in particular to a fracturing fluid which is applicable to soil polluted by polycyclic aromatic hydrocarbon in a hypotonic environment.
Background
Polycyclic aromatic hydrocarbons (Polycyclic Aromatic Hydrocarbons, PAHs) refer to hydrocarbons containing 2 or more benzene rings and various compounds derived from them, and are a class of persistent organic pollutants with a "three-membered" effect. Polycyclic aromatic hydrocarbon is easy to be adsorbed on organic solid substances, is difficult to be degraded due to low bioavailability, can exist in the environment for a long time, and is one of the environmental priority pollutants listed in China. As a class which is widely found in soil, surface water and sewage, its main sources are natural and human activities. Along with the increasing serious pollution of PAHs to soil, serious threat is also generated to the healthy life of human beings, so that the PAHs-polluted soil needs to be effectively repaired, and the work of treating and repairing the PAHs-polluted soil is imperative.
Once the polycyclic aromatic hydrocarbon pollutant enters the hypotonic soil such as the sub-clay and the clay, the phenomenon of bypass flow easily occurs when the traditional extraction-treatment technology, the in-situ chemical oxidation technology, the soil steam leaching technology and the like are used for treatment, the mass transfer of the repairing agent is greatly hindered, the repairing agent is difficult to effectively reach a polluted area, the pollutant in the hypotonic area is difficult to effectively treat, and the pollutant in the hypotonic area can be used as a new pollution source to pollute underground water. Therefore, a method is needed to be found to improve the mass transfer problem of the repairing agent in the hypotonic region and improve the repairing effect of organic pollutant pollution in the hypotonic region. By means of hydraulic fracturing, a hypertonic channel can be artificially created in a hypotonic medium, so that the problems that pollutants in the hypotonic medium are not easy to contact with a repairing agent and the mass transfer of the repairing agent is difficult are solved. Currently, hydraulic fracturing technology is widely applied to the field of oil exploitation, and application to soil is also being paid attention in recent years. The hydraulic fracturing fluid is used as an important component of the hydraulic fracturing technology, the treatment effect of the hydraulic fracturing technology/in-situ chemical oxidation technology on the polluted soil is enhanced by perfecting the formula of the hydraulic fracturing fluid, and little research is performed on the aspect.
Disclosure of Invention
The invention aims at overcoming the defects of the existing hydraulic fracturing fluid for soil, and provides a fracturing fluid for enhancing the treatment efficiency of polycyclic aromatic hydrocarbon in hypotonic soil. The fracturing fluid not only can meet the fracturing requirements of polluted soil, but also can improve the treatment efficiency of pollutants, and provides assistance for subsequent in-situ chemical oxidation leaching.
The invention is realized by the following technical scheme:
a fracturing fluid for enhancing the treatment efficiency of polycyclic aromatic hydrocarbon in hypotonic soil comprises the following components:
in some preferred embodiments: the fracturing fluid comprises the following components:
the technical scheme of the invention is as follows: the mass ratio of the persulfate oxidant, the transition metal salt and the surfactant is 3.5-4.5 in sequence: 0.5 to 1.5:0.5 to 1.
The technical scheme of the invention is as follows: the persulfate oxidant is one of ammonium persulfate, sodium persulfate and potassium persulfate; the transition metal salt is at least one of ferrous sulfate heptahydrate, copper nitrate trihydrate and manganese sulfate monohydrate.
The technical scheme of the invention is as follows: the surfactant is at least one of sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate and sodium dodecyl sulfate.
The technical scheme of the invention is as follows: the propping agent is prepared from the following components in percentage by mass: 0.5 to 1.5:0.5 to 1.5 percent of steel slag, magnetite waste slag and pyrite waste slag.
The technical scheme of the invention is as follows: the pH regulator is one or two of sodium carbonate and potassium carbonate.
The technical scheme of the invention is as follows: the preservative is one or two of hydrogen peroxide and sodium hydroxide.
The technical scheme of the invention is as follows: the vegetable gum thickening agent is sesbania gum, the cross-linking agent is sodium tetraborate decahydrate, and the mass ratio of the gel breaker is 1:1 to 5, and one or two of ammonium persulfate and sodium bisulphite.
The preparation method of the fracturing fluid comprises the following steps:
(1) Preparation of gum base liquid
Mixing the plant gum thickening agent with water, and stirring at a speed of 1000-1400 r/min for 20-30 min to ensure that the thickening agent gum solution has no large-block agglomerates; stirring for 30min at the temperature of 20-30 ℃, and standing and cooling for 20min after stirring is finished to obtain the thickener glue solution which is completely and uniformly dissolved;
adding a cross-linking agent, a gel breaker and a preservative into the thickener glue solution, and stirring at a speed of 1000-1400 r/min for 20-30 min to obtain a glue base solution;
(2) Preparation of modified persulfate solution
Mixing persulfate oxidant, transition metal salt, surfactant, pH regulator and water, and continuously stirring at a speed of 800-1000 r/min for 20-30 min to obtain modified persulfate solution;
(3) Preparation of fracturing fluid
And (3) uniformly mixing the gum base liquid prepared in the step (1) and the modified persulfate solution prepared in the step (2), adding a propping agent, and stirring at a speed of 1000-1400 r/min for 20-30 min to prepare the target product fracturing fluid. The beneficial effects are that:
the fracturing fluid formula prepared by the invention has the following advantages:
(1) According to the invention, through screening of the fracturing fluid formula, hydraulic fracturing is performed on the hypotonic soil polluted by the polycyclic aromatic hydrocarbon, and meanwhile, in-situ chemical oxidation treatment can be performed on the polycyclic aromatic hydrocarbon, and the method has a synergistic restoration effect with subsequent chemical agent leaching, so that the removal rate of polycyclic aromatic hydrocarbon pollutants in the hypotonic soil is greatly improved.
(2) The propping agent selected by the fracturing fluid formula is mostly waste slag and steel slag in industrial production, and industrial waste is directly utilized, so that the environment is protected, the cost is saved, and the utilization rate of waste resources is improved. Meanwhile, the steel slag and various slag contain a large amount of ferrous ions, so that the persulfate oxidant can be activated to improve the degradation rate of the polycyclic aromatic hydrocarbon.
(3) The fracturing fluid provided by the invention has good gel breaking performance, the viscosity of the gel breaking fluid is not more than 5 mPa.s, the damage of the gel breaking fluid to soil is small, and secondary pollution is not easy to generate.
(4) The fracturing fluid provided by the invention is simple in preparation process and easy to popularize and apply.
Therefore, the fracturing fluid prepared by the invention not only can carry out in-situ treatment on the polycyclic aromatic hydrocarbon pollutants and improve the removal rate of the polycyclic aromatic hydrocarbon, but also has the advantages of environmental friendliness, direct utilization of industrial waste, environmental protection, saving of the preparation cost of the fracturing fluid, simple preparation process, low cost, high cost performance and strong application and popularization value.
Drawings
FIG. 1 is a graph showing the apparent viscosity values of the fracturing fluid prepared in example 1 over time.
FIG. 2 is a graph showing the removal rate of polycyclic aromatic hydrocarbon contaminants over time for the fracturing fluid prepared in example 1.
FIG. 3 is a graph showing the apparent viscosity values of the fracturing fluid prepared in example 2 over time.
FIG. 4 is a graph showing the removal rate of polycyclic aromatic hydrocarbon contaminants over time for the fracturing fluid prepared in example 2.
FIG. 5 is a graph showing the apparent viscosity values of the fracturing fluid prepared in example 3 over time.
FIG. 6 is a graph showing the removal rate of polycyclic aromatic hydrocarbon contaminants over time for the fracturing fluid prepared in example 3.
Detailed Description
The invention is further illustrated below with reference to examples, but the scope of the invention is not limited thereto:
sesbania gum thickener, manufacturer: shanghai Yuan Ye Biotech Co., ltd; purity: the Biochemical Reagent (BR) is more than or equal to 99 percent.
Example 1
(1) Preparation of sesbania gum base liquid
10.000g of sesbania gum thickener was weighed into a beaker containing 800mL of clear water and stirred at 1400r/min for 30min using a high speed stirrer so that the thickener gum was free of large agglomerates. And (3) placing the stirred thickener glue solution into a constant-temperature magnetic stirrer, heating at a constant temperature of 30 ℃, stirring at a constant temperature for 30min, and standing and cooling for 20min after stirring is finished to obtain the thickener glue solution which is completely and uniformly dissolved.
4.000g of sodium tetraborate decahydrate, 1.200g of ammonium persulfate, 2.400g of sodium bisulfite and 1.600g of sodium hydroxide are added into the thickener glue solution, and the mixture is stirred at the speed of 1400r/min for 30min by using a high-speed stirrer, so as to obtain sesbania glue base solution.
(2) Preparation of modified persulfate solution
20.000g of sodium persulfate, 5.000g of ferrous sulfate heptahydrate, 2.500g of sodium dodecyl sulfate, 1.600g of sodium carbonate and 1.600g of potassium carbonate are weighed into a beaker with 200mL of clear water, and continuously stirred at a speed of 1000r/min for 30min by using a constant-temperature magnetic stirrer to prepare a modified persulfate solution.
(3) Preparation of fracturing fluid
Uniformly mixing sesbania gum base liquid prepared in the step (1) and the modified persulfate solution prepared in the step (2), adding 100g of steel slag, 100g of magnetite waste slag and 100g of pyrite waste slag, and stirring at a speed of 1400r/min for 30min by using a high-speed stirrer to prepare the fracturing fluid for enhancing the treatment efficiency of the polycyclic aromatic hydrocarbon in the hypotonic soil.
(4) Fracturing fluid performance study
The various viscosities of the fracturing fluid over time were measured using a ZNN-D6 rotary viscometer, and the fracturing fluid viscosity was characterized by an apparent viscosity having a value of 1/2 of a 600-turn reading. The optimal viscosity range of the fracturing fluid of the plant gum commonly used in engineering is 100 mPas-140 mPas, and the viscosity of the fracturing fluid after ten hours of gel breaking is not more than 5 mPas. The apparent viscosity of the fracturing fluid prepared by the fracturing fluid formula obtained through viscosity measurement is 140 mPas, the viscosity of the fracturing fluid after gel breaking for ten hours is 5 mPas, and experiments prove that the fracturing fluid formula meets the application requirements of practical engineering and has excellent performance.
Soil sampling is carried out on a site polluted by polycyclic aromatic hydrocarbon, and the toxicity of anthracene, pyrene and benzopyrene in the taken soil sample is 28.1mmol/kg, 40.9mmol/kg and 0.45mmol/kg respectively, and the total amount of polycyclic aromatic hydrocarbon is 69.45mmol/kg. And (3) placing the sampled soil sample into a fracturing soil column for compaction, injecting the fracturing fluid into the soil sample through a screw pump from a fracturing hole in a fracturing pipe at the center of the soil column, eluting by combining with a Fenton reagent, and finally measuring that the removal rates of 24h, 48h and 72h of the total polycyclic aromatic hydrocarbon are 95.19%, 97.07% and 98.62% respectively.
Example 2
(1) Preparation of sesbania gum base liquid
6.000g of sesbania gum thickener was weighed into a beaker containing 800mL of clear water and stirred at 1400r/min for 30min using a high speed stirrer so that the thickener gum was free of large agglomerates. And (3) placing the stirred thickener glue solution into a constant-temperature magnetic stirrer, heating at a constant temperature of 30 ℃, stirring at a constant temperature for 30min, and standing and cooling for 20min after stirring is finished to obtain the thickener glue solution which is completely and uniformly dissolved.
Adding 2.000g of sodium tetraborate decahydrate, 0.500g of ammonium persulfate, 1.000g of sodium bisulfite and 0.700g of hydrogen peroxide into the thickener glue solution, and stirring at the speed of 1400r/min for 30min by using a high-speed stirrer to obtain sesbania glue base solution.
(2) Preparation of modified persulfate solution
8.000g of sodium persulfate, 2.000g of copper nitrate trihydrate, 1.500g of sodium dodecyl sulfate, and 0.800g of sodium carbonate were weighed into a beaker containing 200mL of clear water, and continuously stirred at a speed of 1000r/min for 30 minutes using a constant-temperature magnetic stirrer to prepare a modified persulfate solution.
(3) Preparation of fracturing fluid
Uniformly mixing sesbania gum base liquid prepared in the step (1) and the modified persulfate solution prepared in the step (2), adding 100g of steel slag, 100g of magnetite waste slag and 100g of pyrite waste slag, and stirring at a speed of 1400r/min for 30min by using a high-speed stirrer to prepare the fracturing fluid for enhancing the treatment efficiency of the polycyclic aromatic hydrocarbon in the hypotonic soil.
(4) Fracturing fluid performance study
The various viscosities of the fracturing fluid over time were measured using a ZNN-D6 rotary viscometer, and the fracturing fluid viscosity was characterized by an apparent viscosity having a value of 1/2 of a 600-turn reading. The optimal viscosity range of the fracturing fluid of the plant gum commonly used in engineering is 100 mPas-140 mPas, and the viscosity of the fracturing fluid after ten hours of gel breaking is not more than 5 mPas. The apparent viscosity of the fracturing fluid prepared by the fracturing fluid formula obtained through viscosity measurement is 115 mPas, the viscosity of the fracturing fluid after gel breaking for ten hours is 4.5 mPas, and experiments prove that the fracturing fluid formula meets the application requirements of practical engineering and has excellent performance.
Soil sampling is carried out on a site polluted by polycyclic aromatic hydrocarbon, and the toxicity of anthracene, pyrene and benzopyrene in the taken soil sample is 28.1mmol/kg, 40.9mmol/kg and 0.45mmol/kg respectively, and the total amount of polycyclic aromatic hydrocarbon is 69.45mmol/kg. And (3) placing the sampled soil sample into a fracturing soil column for compaction, injecting the fracturing fluid into the soil sample through a screw pump from a fracturing hole in a fracturing pipe at the center of the soil column, eluting by combining with a Fenton reagent, and finally measuring that the removal rates of 24h, 48h and 72h of the total polycyclic aromatic hydrocarbon are 90.84%, 93.22% and 95.54% respectively.
Example 3
(1) Preparation of sesbania gum base liquid
8.000g of sesbania gum thickener was weighed into a beaker containing 800mL of clear water and stirred at 1400r/min for 30min using a high speed stirrer so that the thickener gum was free of large agglomerates. And (3) placing the stirred thickener glue solution into a constant-temperature magnetic stirrer, heating at a constant temperature of 30 ℃, stirring at a constant temperature for 30min, and standing and cooling for 20min after stirring is finished to obtain the thickener glue solution which is completely and uniformly dissolved.
3.000g of sodium tetraborate decahydrate, 0.800g of ammonium persulfate, 1.600g of sodium bisulfite and 1.000g of sodium hydroxide are added into the thickener glue solution, and the mixture is stirred at the speed of 1400r/min for 30min by using a high-speed stirrer, so as to obtain sesbania glue base solution.
(2) Preparation of modified persulfate solution
15.000g of sodium persulfate, 4.000g of manganese sulfate monohydrate, 2.000g of sodium dodecylbenzenesulfonate, and 2.200g of potassium carbonate were weighed into a beaker containing 200mL of clear water and continuously stirred at 1000r/min for 30 minutes using a constant temperature magnetic stirrer to prepare a modified persulfate solution.
(3) Preparation of fracturing fluid
Uniformly mixing sesbania gum base liquid prepared in the step (1) and the modified persulfate solution prepared in the step (2), adding 100g of steel slag, 100g of magnetite waste slag and 100g of pyrite waste slag, and stirring at a speed of 1400r/min for 30min by using a high-speed stirrer to prepare the fracturing fluid for enhancing the treatment efficiency of the polycyclic aromatic hydrocarbon in the hypotonic soil.
(4) Fracturing fluid performance study
The various viscosities of the fracturing fluid over time were measured using a ZNN-D6 rotary viscometer, and the fracturing fluid viscosity was characterized by an apparent viscosity having a value of 1/2 of a 600-turn reading. The optimal viscosity range of the fracturing fluid of the plant gum commonly used in engineering is 100 mPas-140 mPas, and the viscosity of the fracturing fluid after ten hours of gel breaking is not more than 5 mPas. The apparent viscosity of the fracturing fluid prepared by the fracturing fluid formula obtained through viscosity measurement is 120 mPas, the viscosity of the fracturing fluid after breaking gel for ten hours is 4 mPas, and experiments prove that the fracturing fluid formula meets the application requirements of practical engineering and has excellent performance.
Soil sampling is carried out on a site polluted by polycyclic aromatic hydrocarbon, and the toxicity of anthracene, pyrene and benzopyrene in the taken soil sample is 28.1mmol/kg, 40.9mmol/kg and 0.45mmol/kg respectively, and the total amount of polycyclic aromatic hydrocarbon is 69.45mmol/kg. And (3) placing the sampled soil sample into a fracturing soil column for compaction, injecting the fracturing fluid into the soil sample through a screw pump from a fracturing hole in a fracturing pipe at the center of the soil column, eluting by combining with a Fenton reagent, and finally measuring that the removal rates of 24h, 48h and 72h of the total polycyclic aromatic hydrocarbon are 92.76%, 94.03% and 96.27% respectively.
Comparative example 1
(1) Preparation of sesbania gum base liquid
Same as in example 1
(2) Preparation of fracturing fluid
The procedure of example 1 was repeated except that the persulfate oxidizer was not added.
(3) Contrast effect
In comparison with example 1, the apparent viscosity and the gel breaking performance of the fracturing fluid obtained by the viscosity measurement were not greatly different from those of example 1 without adding the persulfate oxidizer. However, after leaching by combining Fenton reagent with the same mass as that of example 1, the removal rates of 24h, 48h and 72h of the total polycyclic aromatic hydrocarbon can only reach 61.27%, 64.93% and 67.24% at the highest, and the removal rate of the polycyclic aromatic hydrocarbon is obviously reduced by comparison. The formula of the fracturing fluid disclosed by the invention can effectively enhance the treatment efficiency of polycyclic aromatic hydrocarbon in hypotonic soil.
Comparative example 2
(1) Preparation of sesbania gum base liquid
Same as in example 1
(2) Preparation of fracturing fluid
The procedure of example 1 was repeated except that the persulfate oxidizer and the transition metal salt were not added.
(3) Contrast effect
In comparison with example 1, the apparent viscosity and gel breaking performance of the fracturing fluid obtained by viscosity measurement were not significantly different from those of example 1 without adding persulfate oxidizer or transition metal salt. However, after leaching by combining Fenton reagent with the same mass as that of example 1, the removal rates of the total polycyclic aromatic hydrocarbon measured in 24 hours, 48 hours and 72 hours can only reach 50.54 percent, 52.23 percent and 55.44 percent at the highest, and the removal rate of the polycyclic aromatic hydrocarbon is obviously reduced by comparison. The formula of the fracturing fluid disclosed by the invention can effectively enhance the treatment efficiency of polycyclic aromatic hydrocarbon in hypotonic soil.
Comparative example 3
(1) Preparation of sesbania gum base liquid
Same as in example 1
(2) Preparation of fracturing fluid
The procedure of example 1 was repeated except that the persulfate oxidizer, the transition metal salt, and the surfactant were not added.
(3) Contrast effect
In comparison with example 1, the apparent viscosity and gel breaking performance of the fracturing fluid obtained by viscosity measurement were not significantly different from those of example 1 without adding persulfate oxidizer, transition metal salt and surfactant. However, after leaching by combining Fenton reagent with the same mass as that of example 1, the removal rates of the total polycyclic aromatic hydrocarbon in 24 hours, 48 hours and 72 hours can only reach 45.47 percent, 48.12 percent and 49.78 percent at the highest, and the removal rate of the polycyclic aromatic hydrocarbon is obviously reduced by comparison. The formula of the fracturing fluid disclosed by the invention can effectively enhance the treatment efficiency of polycyclic aromatic hydrocarbon in hypotonic soil.
Comparative example 4
(1) Preparation of sesbania gum base liquid
Same as in example 2
(2) Preparation of fracturing fluid
The procedure of example 2 was repeated except that the transition metal salt was not added.
(3) Contrast effect
In comparison with example 2, the apparent viscosity and gel breaking performance of the fracturing fluid obtained by the viscosity measurement were not greatly different from those of example 2 without adding the transition metal salt. However, after leaching by combining Fenton reagent with the same mass as that of example 2, the removal rates of 24h, 48h and 72h of the total polycyclic aromatic hydrocarbon can only reach 69.49%, 72.07% and 74.59% at the highest, and the removal rate of the polycyclic aromatic hydrocarbon is obviously reduced by comparison. The formula of the fracturing fluid disclosed by the invention can effectively enhance the treatment efficiency of polycyclic aromatic hydrocarbon in hypotonic soil.
Comparative example 5
(1) Preparation of sesbania gum base liquid
Same as in example 3
(2) Preparation of fracturing fluid
The procedure of example 3 was repeated except that the surfactant was not added.
(3) Contrast effect
In comparison with example 3, the apparent viscosity and gel breaking performance of the fracturing fluid obtained by the viscosity measurement were not much different from those of example 3 without adding the surfactant. However, after leaching by combining Fenton reagent with the same mass as that of example 3, the removal rates of the total polycyclic aromatic hydrocarbon in 24 hours, 48 hours and 72 hours can only reach 81.54 percent, 83.85 percent and 85.67 percent at the highest, and the removal rate of the polycyclic aromatic hydrocarbon is obviously reduced by comparison.
The formula of the fracturing fluid disclosed by the invention can effectively enhance the treatment efficiency of polycyclic aromatic hydrocarbon in hypotonic soil.
Claims (10)
1. A fracturing fluid for enhancing the treatment efficiency of polycyclic aromatic hydrocarbon in hypotonic soil is characterized in that: the fracturing fluid comprises the following components:
2. the fracturing fluid for enhancing the treatment efficiency of polycyclic aromatic hydrocarbons in hypotonic soil according to claim 1, wherein the fracturing fluid is characterized in that: the fracturing fluid comprises the following components:
3. the fracturing fluid for enhancing the treatment efficiency of polycyclic aromatic hydrocarbons in hypotonic soil according to claim 1, wherein the fracturing fluid is characterized in that: the mass ratio of the persulfate oxidant, the transition metal salt and the surfactant is 3.5-4.5:0.5-1.5:0.5-1 in turn.
4. A fracturing fluid for enhancing the treatment efficiency of polycyclic aromatic hydrocarbons in hypotonic soil according to any one of claims 1 to 3, characterized in that: the persulfate oxidant is one of ammonium persulfate, sodium persulfate and potassium persulfate; the transition metal salt is at least one of ferrous sulfate heptahydrate, copper nitrate trihydrate and manganese sulfate monohydrate.
5. A fracturing fluid for enhancing the treatment efficiency of polycyclic aromatic hydrocarbons in hypotonic soil according to any one of claims 1 to 3, characterized in that: the surfactant is at least one of sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate and sodium dodecyl sulfate.
6. A fracturing fluid for enhancing the treatment efficiency of polycyclic aromatic hydrocarbons in hypotonic soil according to any one of claims 1 to 3, characterized in that: the propping agent is steel slag, magnetite waste slag and pyrite waste slag with the mass ratio of 0.5-1.5:0.5-1.5 in sequence.
7. A fracturing fluid for enhancing the treatment efficiency of polycyclic aromatic hydrocarbons in hypotonic soil according to any one of claims 1 to 3, characterized in that: the pH regulator is one or two of sodium carbonate and potassium carbonate.
8. A fracturing fluid for enhancing the treatment efficiency of polycyclic aromatic hydrocarbons in hypotonic soil according to any one of claims 1 to 3, characterized in that: the preservative is one or two of hydrogen peroxide and sodium hydroxide.
9. A fracturing fluid for enhancing the treatment efficiency of polycyclic aromatic hydrocarbons in hypotonic soil according to any one of claims 1 to 3, characterized in that: the vegetable gum thickening agent is sesbania gum, the cross-linking agent is sodium tetraborate decahydrate, and the gel breaker is ammonium persulfate and sodium bisulphite with the mass ratio of 1:1-5.
10. A method of preparing the fracturing fluid of claim 1, wherein: the method comprises the following steps:
(1) Preparation of gum base liquid
Mixing the plant gum thickening agent with water, and stirring at a speed of 1000-1400 r/min for 20-30 min to ensure that the thickening agent gum solution has no large-block agglomerates; stirring for 30min at the temperature of 20-30 ℃, and standing and cooling for 20min after stirring is finished to obtain the thickener glue solution which is completely and uniformly dissolved;
adding a cross-linking agent, a gel breaker and a preservative into the thickener glue solution, and stirring at a speed of 1000-1400 r/min for 20-30 min to obtain a glue base solution;
(2) Preparation of modified persulfate solution
Mixing persulfate oxidant, transition metal salt, surfactant, pH regulator and water, and continuously stirring at a speed of 800-1000 r/min for 20-30 min to obtain modified persulfate solution;
(3) Preparation of fracturing fluid
And (3) uniformly mixing the gum base liquid prepared in the step (1) and the modified persulfate solution prepared in the step (2), adding a propping agent, and stirring at a speed of 1000-1400 r/min for 20-30 min to prepare the target product fracturing fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110970716.4A CN113652221B (en) | 2021-08-23 | 2021-08-23 | Fracturing fluid for enhancing treatment efficiency of polycyclic aromatic hydrocarbon in hypotonic soil and preparation method thereof |
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