CN110951474B - Organic porous nanoparticle enhanced clean fracturing fluid and preparation method thereof - Google Patents
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Abstract
The invention discloses an organic porous nanoparticle enhanced clean fracturing fluid and a preparation method thereof, wherein the fracturing fluid comprises the following components in percentage by mass: 1-5% of a surfactant; 1-5% of a counter ion auxiliary agent; 0.05-3% of organic porous nano particles; the balance being water. The preparation method comprises the following steps: adding a surfactant into water, stirring and dissolving, then adding organic porous nanoparticles into a surfactant solution, and then performing ultrasonic dispersion until the organic porous nanoparticles are uniformly dispersed in the surfactant solution to obtain a nanofluid containing the organic porous nanoparticles; and adding a counter-ion auxiliary agent into the nano fluid, uniformly mixing, and standing the mixed solution for 3-6 hours to obtain the organic porous nano particle enhanced clean fracturing fluid. The organic porous nanoparticle enhanced clean fracturing fluid provided by the invention can not block rock pores, improves the viscoelasticity, temperature resistance and shearing resistance of the clean fracturing fluid, and can not damage a reservoir stratum.
Description
Technical Field
The invention relates to the technical field of oilfield chemistry in an oil reservoir transformation technology, in particular to an organic porous nanoparticle enhanced clean fracturing fluid and a preparation method thereof.
Background
The hydraulic fracturing is a reservoir transformation technology widely applied in the development process of oil and gas fields, can form a crack with high flow conductivity around a shaft, reduce the seepage resistance of fluid near the shaft, increase the oil drainage area of an oil and gas well and improve the yield of the oil and gas well. In recent years, with the increasing of the reserve ratio of unconventional oil and gas resources such as shale gas and compact oil, hydraulic fracturing is becoming an essential production increasing measure for oil and gas resource exploitation. The fracturing fluid is used as a core working fluid in the hydraulic fracturing process, has important functions of pressure transmission, proppant conveying and the like, and the performance of the fracturing fluid directly influences the effect of the whole fracturing construction. Fracturing fluids such as guanidine gum fracturing fluid or artificially synthesized polymer fracturing fluid which are commonly used in industry and take macromolecules as thickening agents have high residue content after breaking the gum, have serious damage to the permeability of a reservoir matrix and the flow conductivity of cracks and influence the oil gas yield.
Accordingly, viscoelastic surfactant (VES) clean-up fracturing fluids have received increasing attention in recent years and have increasingly developed industrial applications in oil and gas fields. The VES clean fracturing fluid has no residue after gel breaking, and has little damage to a reservoir after fracturing construction. The thickening effect of the VES clean fracturing fluid mainly comes from the formation of surfactant vermicular micelles, and when the vermicular micelles grow to a certain length, the vermicular micelles can be overlapped and wound with each other, so that a three-dimensional network structure is formed, and the viscosity of the fracturing fluid is increased. However, because the worm-like micelles are easily destroyed, the VES clean fracturing fluid is difficult to maintain the thickening effect under the conditions of high temperature or high-speed shearing and the like, and the application conditions of the VES clean fracturing fluid in oil and gas reservoirs are greatly limited.
In order to improve the stability of a worm-like micelle three-dimensional network and enhance the thickening capability of the VES clean fracturing fluid under the conditions of high temperature or high-speed shearing and the like, the construction of the VES clean fracturing fluid is introduced into nano materials in recent years. Chinese patent CN102093874A discloses an anionic nano composite clean fracturing fluid and a preparation method thereof, and the anionic nano composite clean fracturing fluid comprises the following components in parts by mass: 3-7 parts of an anionic viscoelastic surfactant, and a cosurfactant: 0.05-0.5 part of a counter-ion salt: 3-10 parts of nanoparticles: 0.05-0.5 part of water, 100 parts of water and the anionic nano composite clean fracturing fluid have good temperature resistance and low filtration loss. Chinese patent CN 104419396a discloses a nano-composite fracturing fluid, its preparation method and application, the nano-composite fracturing fluid comprises the following raw materials: 0.5-5% of viscoelastic surfactant, 0.05-3% of nano material, 0.1-0.5% of associative polymer and the balance of water, and the nano composite fracturing fluid has the advantages of low dosage of the viscoelastic surfactant, simple preparation method, small filtration loss, good sand carrying property and the like.
However, the nano materials mainly used in the existing nano composite fracturing fluid are inorganic nano materials such as silica, calcium carbonate, titanium dioxide and alumina, and the nano materials have high strength and no deformation capability, so that the nano materials can easily cause blockage which is difficult to recover on rock croup, and damage a reservoir stratum. Moreover, the dense filter cake formed by the nano material in the fracture can also influence the oil gas in the rock matrix to enter the fracture, and further influence the oil gas production.
Disclosure of Invention
In order to solve the problems, the invention aims to provide an organic porous nanoparticle enhanced clean fracturing fluid and a preparation method thereof.
The technical scheme of the invention is as follows:
on one hand, the organic porous nanoparticle enhanced clean fracturing fluid comprises a surfactant, a counter ion assistant and organic porous nanoparticles, and the organic porous nanoparticle enhanced clean fracturing fluid comprises the following components in percentage by mass: 1-5% of a surfactant; 1-5% of a counter ion auxiliary agent; 0.05-3% of organic porous nano particles; the balance being water.
Preferably, the surfactant is one of sodium oleate, alkyl trimethyl ammonium bromide, alkyl dimethyl ammonium bromide and alkyl polyoxyethylene ether sodium sulfate.
Preferably, the counter ion assistant is one of sodium salicylate, sodium nitrate, sodium maleate, sodium dodecyl sulfate, sodium p-toluenesulfonate, sodium dodecylbenzenesulfonate, sodium chloride and potassium chloride.
Preferably, the organic porous nanoparticles are prepared according to the following steps:
dropwise adding a mixed solution of 4-vinylbenzyl chloride and divinylbenzene into deionized water dissolved with sodium dodecyl sulfate, stirring and emulsifying, continuing to stir and emulsify for 0.5-1 hour after the dropwise addition of the mixed solution is completed, introducing nitrogen to remove oxygen for 15-30 minutes after the emulsification is completed, heating the emulsion to 60-80 ℃, adding an ammonium persulfate or potassium persulfate aqueous solution to initiate a reaction for 6-12 hours, keeping stirring in the reaction process, adding ethanol or a demulsifier into the emulsion after the reaction is completed, demulsifying, carrying out centrifugal separation to obtain crosslinked nano-microspheres, and then washing and drying for multiple times to obtain crosslinked nano-microsphere dry powder;
dispersing the crosslinked nano microsphere dry powder in 1, 2-dichloroethane to expand for 6-12 hours, then adding anhydrous ferric trichloride or anhydrous aluminum trichloride, heating to 70-90 ℃ to react for 16-20 hours, cooling to room temperature after the reaction is finished, and then washing, purifying and drying to obtain the organic porous nano particles.
Preferably, the mass ratio of the 4-vinylbenzyl chloride to the divinylbenzene is 9.2: 0.8-9.8: 0.2; the volume ratio of the mixed solution of the 4-vinylbenzyl chloride and the divinylbenzene to the deionized water dissolved with the sodium dodecyl sulfate is 1: 40-1: 5; the mass ratio of the sodium dodecyl sulfate to the mixed solution of 4-vinylbenzyl chloride and divinylbenzene is 1: 100-1: 10; the mass ratio of the potassium persulfate or the ammonium persulfate to the mixed solution of the 4-vinyl benzyl chloride and the divinylbenzene is 1: 100-1: 50.
Preferably, the mass ratio of the crosslinked polymeric nano microsphere dry powder to the anhydrous ferric trichloride or the anhydrous aluminum trichloride is 1: 1-1: 2.
Preferably, the stirring rate in the emulsification process and the reaction process is 200 to 500 rpm.
Preferably, the crosslinked nano-microspheres are washed by water and ethanol in sequence, and the product obtained by adding anhydrous ferric trichloride or anhydrous aluminum trichloride for reaction is washed by methanol.
Preferably, after adding anhydrous ferric trichloride or anhydrous aluminum trichloride, the temperature is firstly increased to 40-50 ℃ for reaction for 4-6 hours, and then the temperature is increased to 70-90 ℃ for reaction for 16-20 hours.
In another aspect, there is also provided a method of preparing any one of the organic porous nanoparticle-enhanced clean fracturing fluids described above, comprising the steps of:
adding a surfactant into water, stirring and dissolving, then adding organic porous nanoparticles into a surfactant solution, and then performing ultrasonic dispersion until the organic porous nanoparticles are uniformly dispersed in the surfactant solution to obtain a nanofluid containing the organic porous nanoparticles;
and adding a counter-ion auxiliary agent into the nano fluid, uniformly mixing, and standing the mixed solution for 3-6 hours to obtain the organic porous nano particle enhanced clean fracturing fluid.
Compared with the prior art, the invention has the following advantages:
the fracturing fluid disclosed by the invention contains organic porous nanoparticles, the organic porous nanoparticles have rich pore structures and certain deformation capacity, rock pores cannot be blocked, vermicular micelles of the surfactant can be bridged by physical acting force between the organic porous nanoparticles and the surfactant molecules, the stability and strength of a vermicular micelle network in the fracturing fluid are enhanced, and the viscoelasticity, temperature resistance and shearing resistance of the fracturing fluid are improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram showing the results of viscoelasticity test of the organic porous nanoparticle enhanced clean fracturing fluid prepared in example 1;
fig. 2 is a schematic diagram of the rheological test results of the organic porous nanoparticle enhanced clean fracturing fluid prepared in example 2;
fig. 3 is a graph showing the results of the steady state shear viscosity test of the organic porous nanoparticle enhanced clean fracturing fluid prepared in example 2.
Detailed Description
The invention is further illustrated with reference to the following figures and examples. It should be noted that, in the present application, the embodiments and the technical features of the embodiments may be combined with each other without conflict.
On one hand, the invention provides an organic porous nanoparticle enhanced clean fracturing fluid, which comprises a surfactant, a counter ion assistant and organic porous nanoparticles, wherein the organic porous nanoparticle enhanced clean fracturing fluid comprises the following components in percentage by mass: 1-5% of a surfactant; 1-5% of a counter ion auxiliary agent; 0.05-3% of organic porous nano particles; the balance being water.
Optionally, the surfactant is any one of an anionic surfactant, a cationic surfactant, a nonionic surfactant, an anionic-nonionic surfactant, and an amphoteric surfactant. In a specific embodiment, the surfactant is one of sodium oleate, alkyl trimethyl ammonium bromide, alkyl dimethyl ammonium bromide, and alkyl polyoxyethylene ether sodium sulfate. The alkyl trimethyl ammonium bromide is any one of alkyl trimethyl ammonium bromide surfactants such as behenyl trimethyl ammonium bromide, octadecyltrimethyl ammonium bromide and hexadecyl trimethyl ammonium bromide, and the alkyl dimethyl ammonium bromide is any one of alkyl dimethyl ammonium bromide surfactants such as octaalkyl dimethyl ammonium bromide, decaalkyl dimethyl ammonium bromide and bis-nonaalkyl dimethyl ammonium bromide.
In a specific embodiment, the counter ion assistant is one of sodium salicylate, sodium nitrate, sodium maleate, sodium dodecyl sulfate, sodium p-toluenesulfonate, sodium dodecylbenzenesulfonate, sodium chloride and potassium chloride.
In a specific embodiment, the organic porous nanoparticles are prepared according to the following steps:
dropwise adding a mixed solution of 4-vinylbenzyl chloride and divinylbenzene into deionized water dissolved with sodium dodecyl sulfate, stirring and emulsifying, continuing to stir and emulsify for 0.5-1 hour after the dropwise adding of the mixed solution is completed, introducing nitrogen to remove oxygen for 15-30 minutes after the emulsification is completed, heating the emulsion to 60-80 ℃, adding an ammonium persulfate or potassium persulfate aqueous solution to initiate a reaction for 6-12 hours, keeping stirring in the reaction process, adding ethanol or a demulsifier into the emulsion after the reaction is completed, demulsifying, carrying out centrifugal separation to obtain crosslinked nano-microspheres, and then washing and drying for multiple times to obtain the crosslinked nano-microsphere dry powder. The mass ratio of the 4-vinylbenzyl chloride to the divinylbenzene is 9.2: 0.8-9.8: 0.2; the volume ratio of the mixed solution of the 4-vinylbenzyl chloride and the divinylbenzene to the deionized water dissolved with the sodium dodecyl sulfate is 1: 40-1: 5; the mass ratio of the sodium dodecyl sulfate to the mixed solution of 4-vinylbenzyl chloride and divinylbenzene is 1: 100-1: 10; the mass ratio of the potassium persulfate or the ammonium persulfate to the mixed solution of the 4-vinyl benzyl chloride and the divinylbenzene is 1: 100-1: 50.
Dispersing the crosslinked nano microsphere dry powder in 1, 2-dichloroethane to expand for 6-12 hours, then adding anhydrous ferric trichloride or anhydrous aluminum trichloride, heating to 70-90 ℃ to react for 16-20 hours, cooling to room temperature after the reaction is finished, and then washing, purifying and drying to obtain the organic porous nano particles. The mass ratio of the crosslinked polymeric nano microsphere dry powder to the anhydrous ferric trichloride or the anhydrous aluminum trichloride is 1: 1-1: 2. The volume ratio of the mass of the crosslinking nano microsphere dry powder to the 1, 2-dichloroethane is 1g/10 ml-1 g/100 ml.
In this embodiment, a benzene ring group is used to form a hydrophobic skeleton inside the organic porous nanoparticle, pores among the structures have selective permeability, oil and gas can pass through the pores but water is difficult to pass through the pores, so that a filter cake formed by the organic porous nanoparticle in this embodiment can reduce the filtration loss of clean fracturing fluid on one hand, and cannot prevent oil and gas from entering a fracture from a rock matrix on the other hand, and meanwhile, the relatively low strength of the organic porous nanoparticle itself cannot clog pores in the rock to cause reservoir damage.
In the preparation process of the present embodiment, the stirring rate in the emulsification process and the reaction process is 200-500 rpm.
Optionally, the crosslinked nanospheres are washed sequentially with water and ethanol, and the product obtained by adding anhydrous ferric trichloride or anhydrous aluminum trichloride for reaction is washed with methanol. In a specific embodiment, the crosslinked nanospheres are washed three times with water and then three times with ethanol.
In another specific embodiment, different from the above embodiments, after adding anhydrous ferric trichloride or anhydrous aluminum trichloride, heating to 40-50 ℃ for reaction for 4-6 hours, and then heating to 70-90 ℃ for reaction for 16-20 hours, the hypercrosslinking effect can be improved to a small extent, and the formed organic porous nanoparticles have a slightly higher pore volume and specific surface area, which is helpful for enhancing the ability of reducing the filtration loss of the clean fracturing fluid.
In another aspect, the present invention also provides a method for preparing any one of the organic porous nanoparticle-enhanced clean fracturing fluids described above, comprising the steps of:
adding a surfactant into water, stirring and dissolving, then adding organic porous nanoparticles into a surfactant solution, and then performing ultrasonic dispersion until the organic porous nanoparticles are uniformly dispersed in the surfactant solution to obtain a nanofluid containing the organic porous nanoparticles;
and adding a counter-ion auxiliary agent into the nano fluid, uniformly mixing, and standing the mixed solution for 3-6 hours to obtain the organic porous nano particle enhanced clean fracturing fluid.
In a specific embodiment, the ultrasonic dispersion time is 0.5-1 h.
Example 1
Dropwise adding a mixed solution of 9.5g of 4-vinylbenzyl chloride and 0.5g of divinylbenzene into 100g of deionized water in which 0.15g of lauryl sodium sulfate is dissolved, stirring and emulsifying at the speed of 400 revolutions per minute, continuously stirring and emulsifying for 1 hour after the dropwise adding of the mixed solution of 4-vinylbenzyl chloride and divinylbenzene is completed, introducing nitrogen to remove oxygen for 15 minutes after the emulsifying is completed, heating the emulsion to 80 ℃, adding 5g of an aqueous solution of potassium persulfate to initiate a reaction, wherein the mass concentration of the aqueous solution of potassium persulfate is 2%, the stirring speed is kept at 400 revolutions per minute during the reaction, and the reaction is completed after 10 hours. And adding ethanol into the reacted emulsion for demulsification, then centrifugally separating the crosslinked nano microspheres, respectively washing the crosslinked nano microspheres for three times by adopting water and ethanol, and drying to obtain the crosslinked nano microsphere dry powder.
5g of crosslinking nano microsphere dry powder is dispersed in 200mL of 1, 2-dichloroethane to be expanded for 6 hours, then 6g of anhydrous ferric trichloride is added into the 1, 2-dichloroethane suspension of the crosslinking nano particles, the temperature of the mixed system is raised to 45 ℃ to react for 4 hours, and then the temperature is raised to 80 ℃ again to react for 20 hours. And after the reaction is finished, cooling to room temperature, washing and purifying the product by using methanol, and drying the product to obtain the organic porous nano-particles.
3g of sodium oleate was added to 94.6g of water and dissolved with stirring, and then 0.1g of the organic porous nanoparticles was added to the sodium oleate solution and ultrasonically dispersed for 0.5h to form nanofluids.
And adding 2.3g of potassium chloride into the nanofluid, stirring and dissolving, and standing for 3 hours to obtain the organic porous nanoparticle enhanced clean fracturing fluid.
The organic porous nanoparticle enhanced clean fracturing fluid prepared in the embodiment was subjected to viscoelasticity test by using a Haake RS6000 rheometer, the test temperature was 25 ℃, and the test results are shown in fig. 1. As can be seen from fig. 1, when the frequency is low, the viscous modulus of the organic porous nanoparticle enhanced clean fracturing fluid is significantly higher than the elastic modulus, and the fracturing fluid mainly shows the characteristics of a viscid. The magnitude of increase in elastic modulus of the organic porous nanoparticle enhanced clean fracturing fluid is higher than that of the viscous modulus with increasing frequency, and when the frequency is increased to 2Hz, the value of the elastic modulus begins to be higher than that of the viscous modulus, and the fracturing fluid begins to show the characteristics of an elastomer. The conclusion shows that the organic porous nanoparticle enhanced clean fracturing fluid has good viscoelasticity.
Example 2
Adding a mixed solution of 9.8g of 4-vinylbenzyl chloride and 0.2g of divinylbenzene dropwise into 100g of deionized water in which 0.6g of lauryl sodium sulfate is dissolved, stirring and emulsifying at the speed of 500 revolutions per minute, continuing stirring and emulsifying for 1 hour after the dropwise addition of the mixed solution of 4-vinylbenzyl chloride and divinylbenzene is completed, introducing nitrogen to remove oxygen for 15 minutes after the emulsification is completed, heating the emulsion to 80 ℃, adding 6g of an aqueous solution of potassium persulfate to initiate a reaction, wherein the mass concentration of the aqueous solution of potassium persulfate is 2%, the stirring speed is kept at 400 revolutions per minute during the reaction, and the reaction is completed after 10 hours. And adding ethanol into the reacted emulsion for demulsification, then centrifugally separating the crosslinked nano microspheres, respectively washing the crosslinked nano microspheres for three times by adopting water and ethanol, and drying to obtain the crosslinked nano microsphere dry powder.
Dispersing 4g of crosslinking nano microsphere dry powder in 180mL of 1, 2-dichloroethane, expanding for 6 hours, then adding 8g of anhydrous aluminum trichloride into the 1, 2-dichloroethane suspension of the crosslinking nano particles, heating the mixed system to 45 ℃ for reaction for 4 hours, and then heating to 80 ℃ again for reaction for 20 hours. And after the reaction is finished, cooling to room temperature, washing and purifying the product by using methanol, and drying the product to obtain the organic porous nano-particles.
1.1g of cetyltrimethylammonium bromide was added to 97.07g of water and dissolved with stirring, and then 0.2g of porous nanoparticles were added to the cetyltrimethylammonium bromide solution and dispersed ultrasonically for 0.5h to form nanofluids.
And adding 1.63g of sodium salicylate into the nanofluid, stirring and dissolving, and standing for 3 hours to obtain the organic porous nanoparticle enhanced clean fracturing fluid.
The porous nanoparticle enhanced clean fracturing fluid prepared in the embodiment is subjected to rheological property and steady state shear test by adopting a Haake RS6000 rheometer, the test temperature is 50 ℃, and the shear rate of the steady state shear test is 170s-1The test results are shown in fig. 2 and 3, respectively. As can be seen from fig. 2, the viscosity of the organic porous nanoparticle enhanced clean fracturing fluid is substantially unchanged at lower shear rates, and the viscosity begins to decrease as the shear rate increases to a certain value, mainly because the worm micellar network in the fracturing fluid can remain stable at low shear rates, while the network is somewhat destroyed under high shear. However, as shown in fig. 3, although the worm micelle network is partially destroyed under high-speed shearing, the organic porous nanoparticle reinforced clean fracturing fluid has good viscosifying capacity under long-time high-speed shearing, and the viscosity is always maintained at about 110mPa · s. The conclusion shows that the organic porous nanoparticle enhanced clean fracturing fluid has good viscoelasticity.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The organic porous nanoparticle enhanced clean fracturing fluid is characterized by comprising the following components in percentage by mass: 1-5% of a surfactant; 1-5% of a counter ion auxiliary agent; 0.05-3% of organic porous nano particles; the balance of water; the organic porous nanoparticles are prepared according to the following steps:
dropwise adding a mixed solution of 4-vinylbenzyl chloride and divinylbenzene into deionized water dissolved with sodium dodecyl sulfate, stirring and emulsifying, continuing to stir and emulsify for 0.5-1 hour after the dropwise addition of the mixed solution is completed, introducing nitrogen to remove oxygen for 15-30 minutes after the emulsification is completed, heating the emulsion to 60-80 ℃, adding an ammonium persulfate or potassium persulfate aqueous solution to initiate a reaction for 6-12 hours, keeping stirring in the reaction process, adding ethanol or a demulsifier into the emulsion after the reaction is completed, demulsifying, then carrying out centrifugal separation to obtain crosslinked nano-microspheres, and then washing and drying for multiple times to obtain crosslinked nano-microsphere dry powder;
dispersing the crosslinked nano microsphere dry powder in 1, 2-dichloroethane to expand for 6-12 hours, then adding anhydrous ferric trichloride or anhydrous aluminum trichloride, heating to 70-90 ℃ to react for 16-20 hours, cooling to room temperature after the reaction is finished, and then washing, purifying and drying to obtain the organic porous nano particles.
2. The organic porous nanoparticle enhanced clean fracturing fluid of claim 1, wherein the surfactant is one of sodium oleate, alkyl trimethyl ammonium bromide, and sodium alkyl polyoxyethylene ether sulfate.
3. The organic porous nanoparticle-enhanced clean fracturing fluid of claim 1, wherein the counter ion adjuvant is one of sodium salicylate, sodium nitrate, sodium maleate, sodium dodecyl sulfate, sodium p-toluenesulfonate, sodium dodecylbenzenesulfonate, sodium chloride and potassium chloride.
4. The organic porous nanoparticle-enhanced clean fracturing fluid of claim 1, wherein the mass ratio of 4-vinylbenzyl chloride to divinylbenzene is 9.2: 0.8-9.8: 0.2; the volume ratio of the mixed solution of the 4-vinylbenzyl chloride and the divinylbenzene to the deionized water dissolved with the sodium dodecyl sulfate is 1: 40-1: 5; the mass ratio of the sodium dodecyl sulfate to the mixed solution of 4-vinylbenzyl chloride and divinylbenzene is 1: 100-1: 10; the mass ratio of the potassium persulfate or the ammonium persulfate to the mixed solution of the 4-vinyl benzyl chloride and the divinylbenzene is 1: 100-1: 50.
5. The organic porous nanoparticle-enhanced clean fracturing fluid as claimed in claim 1, wherein the mass ratio of the crosslinked nanoparticle dry powder to the anhydrous ferric trichloride or the anhydrous aluminum trichloride is 1: 1-1: 2.
6. The organic porous nanoparticle enhanced clean fracturing fluid of claim 1, wherein the stirring speed in the emulsification process and the reaction process is 200-500 rpm.
7. The organic porous nanoparticle-enhanced clean fracturing fluid of claim 1, wherein the crosslinked nanospheres are washed with water and ethanol in sequence, and the product obtained by adding anhydrous ferric trichloride or anhydrous aluminum trichloride and reacting is washed with methanol.
8. The organic porous nanoparticle-enhanced clean fracturing fluid as claimed in claim 1, wherein after adding anhydrous ferric trichloride or anhydrous aluminum trichloride, the temperature is raised to 40-50 ℃ for reaction for 4-6 hours, and then raised to 70-90 ℃ for reaction for 16-20 hours.
9. A method of preparing the organic porous nanoparticle enhanced clean fracturing fluid of any one of claims 1 to 8, comprising the steps of:
adding a surfactant into water, stirring and dissolving, then adding organic porous nanoparticles into a surfactant solution, and then performing ultrasonic dispersion until the organic porous nanoparticles are uniformly dispersed in the surfactant solution to obtain a nanofluid containing the organic porous nanoparticles;
and adding a counter-ion auxiliary agent into the nano fluid, uniformly mixing, and standing the mixed solution for 3-6 hours to obtain the organic porous nano particle enhanced clean fracturing fluid.
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| US8258083B2 (en) * | 2004-12-30 | 2012-09-04 | Sun Drilling Products Corporation | Method for the fracture stimulation of a subterranean formation having a wellbore by using impact-modified thermoset polymer nanocomposite particles as proppants |
| CN101824118B (en) * | 2010-05-26 | 2011-08-10 | 华中科技大学 | Porous polymer nanoparticles and preparation method thereof |
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