CN108102633B - Viscoelastic acid-based fracturing fluid and preparation method thereof - Google Patents
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Abstract
The invention provides a viscoelastic acid-based fracturing fluid and a preparation method thereof. The composition of the viscoelastic acid-based fracturing fluid of the invention comprises: a thickening agent: 2.0-7.5 parts by weight; 31-37 wt.% concentrated hydrochloric acid: 50.0 to 75.0 parts by weight; a counter ion salt: 0.5-2.5 parts by weight; corrosion inhibitor: 0.5-2.5 parts by weight; iron ion stabilizer: 1.5-5.0 parts by weight. The system of the invention is strong acid, high temperature resistant, high viscosity, automatic gel breaking, no residue in gel breaking liquid, and has the advantages of simple raw material, low cost, convenient liquid preparation, etc.
Description
Technical Field
The invention relates to a viscoelastic acid-based fracturing fluid and a preparation method thereof, belonging to the technical field of oil and gas exploitation.
Background
The hydraulic sand-adding composite fracturing technology integrated with fracturing and acidizing can form cracks with high flow conductivity. The conventional fracturing fluid is water-based fracturing fluid, the higher the viscosity of the fracturing fluid is, the better the sand carrying performance is, the water-based fracturing fluid mainly adopts thickening agents of guar gum and a cross-linking agent of borax for cross-linking and the like under an alkaline condition, the molecular weight of the guar gum is more than 100 ten thousand, macromolecular substances of the guar gum are easy to adsorb and retain to block a fluid seepage passage of a reservoir stratum, fracturing fluid residues block a supporting crack, and filter cakes cause damage to the wall surface of the crack. In recent years, a great deal of research work is carried out at home and abroad aiming at the aspects, but the problems of adsorption and retention of macromolecular substances in reservoir pore channels, invasion and damage of alkaline fluid to the reservoir and the like are not solved all the time. In addition, the conventional hydrochloric acid has high acidification speed and short action distance, and the viscosity of the acid solution needs to be improved to reduce the reaction speed of acid rocks.
Yangdong discloses a crosslinked acid-based fracturing fluid system crosslinked acid in a research on a crosslinked acid-based fracturing fluid system (Master academic thesis 2006 of southwest oil university), wherein a route for chemically synthesizing a cationic high-molecular compound as a thickening agent is selected, cheap Acrylamide (AM) and methacryloyloxyethyl trimethyl ammonium chloride (DMC) are used for binary copolymerization to synthesize a novel acid thickener CH-II, and a matched crosslinking agent ZJL and a composite gel breaker DP are developed and optimized on the basis of the developed thickener CH-II. The cross-linked acid-base fracturing fluid system has the advantages of high viscosity, low filtration loss, low friction resistance, easiness in pumping, low acid-rock reaction speed, high joint forming efficiency, easiness in flowback, good rheological property, capability of carrying sand and the like, so that the aims of realizing deep penetration of an acid system, improving the flow conductivity of acid-etched fractures, prolonging the effective period after fracturing and improving the single-well productivity can be fulfilled. However, in the crosslinked acid-based fracturing fluid system, the thickening agent is a polymer high molecular substance and heavy metals such as a crosslinking agent need to be added, so that the damage of the high molecular substance to the stratum cannot be reduced.
Disclosure of Invention
An object of the present invention is to provide a viscoelastic acid-based fracturing fluid that is resistant to high temperatures, has high viscosity, and reduces damage to the formation.
Another object of the present invention is to provide a method for preparing the viscoelastic acid-based fracturing fluid.
In one aspect, the present invention provides a viscoelastic acid-based fracturing fluid composition comprising:
a thickening agent: 2.0-7.5 parts by weight;
31-37 wt.% concentrated hydrochloric acid: 50.0 to 75.0 parts by weight;
a counter ion salt: 0.5-2.5 parts by weight;
corrosion inhibitor: 0.5-2.5 parts by weight;
iron ion stabilizer: 1.5-5.0 parts by weight.
According to a particular embodiment of the invention, the viscoelastic acid-based fracturing fluid composition of the invention further comprises an amount of water such that the sum of the components is 100 parts by weight.
According to a particular embodiment of the invention, the viscoelastic acid-based fracturing fluid composition of the invention, based on 100% of its total weight, comprises the following components:
a thickening agent: 2.0wt.% to 7.5 wt.%;
31-37 wt.% concentrated hydrochloric acid: 50.0wt.% to 75.0 wt.%;
a counter ion salt: 0.5wt.% to 2.5 wt.%;
corrosion inhibitor: 0.5wt.% to 2.5 wt.%;
iron ion stabilizer: 1.5wt.% to 5.0 wt.%;
water: and (4) the balance.
According to a specific embodiment of the present invention, in the viscoelastic acid-based fracturing fluid composition of the present invention, the viscosifying agent may comprise one or more of cetyltrimethylammonium chloride, behenyltrimethylammonium chloride, dicetyldimethylammonium chloride, dioctadecyldimethylammonium chloride, lauramidopropylbetaine. When a mixture of a plurality of components is used as the thickener of the present invention, the components may be mixed in any ratio.
According to a particular embodiment of the invention, in the viscoelastic acid-based fracturing fluid composition of the invention, the counter-ion salt comprises one or more of sodium lauryl sulfate, sodium salicylate, sodium benzoate, potassium chloride. When multiple component counter ion salts are employed, the components can be mixed in any ratio.
According to a particular embodiment of the invention, in the viscoelastic acid-based fracturing fluid composition of the invention, the corrosion inhibitor comprises one or more of 1,6- (a-octylpyridine) hexane chloride, 1, 3-pyridine dichloride-2-hydroxypropane, 1, 4- (a-octylpyridine) butane bromide, oleic imidazoline, bicyclic imidazoline, benzimidazole.
According to a particular embodiment of the invention, in the viscoelastic acid-based fracturing fluid composition of the invention, the iron ion stabilizer comprises one or more of a ferric citrate ion stabilizer, a ferric ethylenediaminetetraacetic acid sodium salt ion stabilizer, and a ferric erythorbate ion stabilizer.
The invention also provides a viscoelastic acid-based fracturing fluid which is prepared from the viscoelastic acid-based fracturing fluid composition.
The invention also provides a method of preparing a viscoelastic acid-based fracturing fluid, the method comprising the steps of:
a. dissolving the thickening agent in water, adding a corrosion inhibitor and an iron ion stabilizer (without limiting the sequence of adding the corrosion inhibitor and the iron ion stabilizer), and then adding concentrated hydrochloric acid to obtain an acidic thickening agent liquid;
b. dissolving a counter ion salt in water to obtain a counter ion solution;
c. and mixing the acidic thickening agent liquid and the counter ion solution, and uniformly stirring to obtain the viscoelastic acid-based fracturing fluid system.
The preparation method of the viscoelastic acid-based fracturing fluid can be carried out at normal temperature and normal pressure.
The viscoelastic acid-based fracturing fluid system is formed by crosslinking a surfactant and a counter-ion salt in an acid solution, has the molecular weight of less than 1000, does not contain any high polymer, is strong in acidity, high-temperature resistance and high in viscosity, can automatically break gel, has no residue in gel breaking liquid, and can realize a hydraulic sand-adding composite fracturing technology integrating fracturing and acidizing The acid etching-supporting composite fracture with longer-term flow conductivity can thoroughly improve the seepage capability of a near-wellbore zone and a near-fracture zone.
Overall, the viscoelastic acid-based fracturing fluid and the preparation method thereof of the invention have the following beneficial effects:
1. the viscoelastic acid-based fracturing fluid provided by the invention can be used for a hydraulic sand-adding composite fracturing technology integrating fracturing and acidizing, can resist a carbonate rock reservoir with the temperature of 90-110 ℃, has the viscosity of 100-180 mPa & s, and can be used for matrix acidizing around an artificial fracture during fracturing, so that the acidizing range is greatly increased, not only can pollution and seepage resistance in a near-wellbore area be relieved, but also a fracture with high flow conductivity as same as that of hydraulic fracturing can be formed, and meanwhile, the damage of the fracturing fluid in a near-fracture wall filtration zone to a stratum can be relieved by acid in the fracturing fluid, so that an acid-etching-supporting composite fracture with higher flow conductivity and longer-period flow conductivity can be formed.
2. The traditional water-based fracturing fluid is incomplete in gel breaking, the content of water insoluble substances is high, more residues are generated after gel breaking, and the formation is damaged, while the thickening agent used by the viscoelastic acid-based fracturing fluid is a surfactant and has a small molecular weight, and the formed viscoelastic acid-based fracturing fluid automatically breaks gel when contacting crude oil, formation water or natural gas.
3. The viscoelastic acid-based fracturing fluid has the advantages of simple raw materials, low cost, convenience in fluid preparation and the like.
Drawings
Figure 1 is a graph of the viscosity of an acid based fracturing fluid of dioctadecyldimethylammonium chloride as a function of temperature.
Figure 2 is a graph of acid-based fracturing fluid viscosity versus temperature for lauramidopropyl betaine.
FIG. 3 is a graph of acid based fracturing fluid viscosity of behenyl trimethyl ammonium chloride as a function of temperature.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Example 1:
the embodiment provides an acid-based fracturing fluid, which comprises the following components in percentage by mass:
a thickening agent: dioctadecyldimethylammonium chloride 7.5wt. -%)
31wt.% concentrated hydrochloric acid: 50.0wt. -%)
A counter ion salt: 0.5wt.% of sodium dodecyl sulfate
Corrosion inhibitor: 0.5wt.% of bicyclic imidazoline
Iron ion stabilizer: 1.5wt.% of ethylenediaminetetraacetic acid sodium salt iron ion stabilizer
The balance being water.
The preparation process comprises the following steps:
according to the proportion, dioctadecyl dimethyl ammonium chloride is added into water at normal temperature to be fully dissolved, corrosion inhibitor dicyclo imidazoline 3, ethylene diamine tetraacetic acid disodium salt iron ion stabilizer and 31wt.% concentrated hydrochloric acid are sequentially added to obtain an acidic thickening agent solution, and counter ion salt lauryl sodium sulfate is dissolved into water, then the two solutions are mixed and stirred uniformly, so that a viscoelastic acid base fracturing fluid system can be obtained, and the data is shown in table 1.
TABLE 1 viscosity of dioctadecyl dimethyl ammonium chloride acid base fracturing fluid as a function of temperature
| Temperature/. |
60 | 70 | 80 | 90 | 100 | 110 | 120 |
| viscosity/ |
120 | 115 | 110 | 100 | 60 | 30 | 20 |
After the viscoelastic acid-based fracturing fluid completes the acidizing and fracturing effects in the stratum, the viscoelastic acid-based fracturing fluid is contacted with crude oil, formation water or natural gas to break gelled water, otherwise, viscoelastic substances can have negative effects on the acidizing and stimulation effects of the stratum. The viscoelastic acid-based fracturing fluid has the great characteristics that the gel is broken simply and thoroughly by the residual acid without adding a gel breaker, and the gel can be broken by the residual acid when the residual acid meets hydrocarbon.
Gel breaking experiments 1,
In the experiment, kerosene is selected as a gel breaker, acid-based fracturing fluid and the kerosene are mixed according to different proportions during the experiment, the mixture is stirred for 60min at 60 ℃ and 90 ℃, and then residual acid fracturing fluid is taken out to measure the viscosity (the apparent viscosity at the experiment temperature is less than 5mPa & s, namely the complete gel breaking). The data are shown in Table 2.
Gel breaking experiment 2,
In the experiment, a large amount of water is added, and the viscosity of the gel is measured (the apparent viscosity is less than 5mPa & s at the experiment temperature, namely the gel is broken completely). The data are shown in Table 3.
TABLE 2 viscosity of viscoelastic acid-based fracturing fluids at different temperatures after 60min with addition of different amounts of kerosene
| Coal oil content/wt. -%) | 5 | 6 | 8 | 10 | 12 |
| viscosity/mPas at 60 DEG C | 4 | 3 | 2 | 1 | 1 |
| viscosity/mPas at 90 DEG C | 1 | 1 | 0 | 0 | 0 |
TABLE 3 viscosity of viscoelastic acid-based fracturing fluids at different temperatures with different water additions
| Water/wt. -%) | 100 | 200 | 300 | 400 | 500 |
| viscosity/mPas at 60 DEG C | 45 | 24 | 5 | 1 | 0 |
| viscosity/mPas at 90 DEG C | 22 | 12 | 3 | 0 | 0 |
As can be seen from Table 1 and FIG. 1, the acid-based fracturing fluid prepared from the thickening agent dioctadecyl dimethyl ammonium chloride has viscosity decreasing with temperature rising, and the viscosity reaches 100mPa & s at 90 ℃, so that the viscosity required by fracturing sand carrying can be met.
As can be seen from Table 2, at a low temperature of 60 ℃, the kerosene content of 5wt.% can meet the gel breaking requirement, and the dioctadecyl dimethyl ammonium chloride acid-based fracturing fluid can completely break gel within 60-90 ℃.
As can be seen from Table 3, the dioctadecyldimethylammonium chloride acid based fracturing fluid broke completely when 3 times as much water was added.
Example 2:
the embodiment provides an acid-based fracturing fluid, which comprises the following components in percentage by mass:
a thickening agent: lauramidopropyl betaine 7.5wt. -%)
37wt.% concentrated hydrochloric acid: 50wt. -%)
A counter ion salt: 2.5wt.% of potassium chloride
Corrosion inhibitor: oleic acid imidazoline 2.5wt. -%)
Iron ion stabilizer: isoascorbic acid iron ion stabilizer 4.5wt. -%)
The balance being water.
The preparation process comprises the following steps:
according to the proportion, lauramidopropyl betaine is added into water at normal temperature and fully dissolved, corrosion inhibitor oleic acid imidazoline, isoascorbic acid iron ion stabilizer and 37wt.% concentrated hydrochloric acid are sequentially added to obtain an acidic thickening agent solution, a counter ion salt potassium chloride is dissolved in water, the two solutions are mixed and stirred uniformly, and a viscoelastic acid group fracturing fluid system can be obtained, wherein the data are shown in table 4.
TABLE 4 viscosity of lauramidopropyl betaine acid based fracturing fluid as a function of temperature
| Temperature- |
60 | 70 | 80 | 90 | 100 | 110 | 120 |
| viscosity/ |
150 | 140 | 130 | 120 | 100 | 60 | 20 |
After the viscoelastic acid-based fracturing fluid completes the acidizing fracturing effect in the stratum, gelled water needs to be broken when the viscoelastic acid-based fracturing fluid contacts crude oil, formation water or natural gas, otherwise, viscoelastic substances can have negative effects on the acidizing and stimulation effects of the stratum. The viscoelastic acid-based fracturing fluid has the great characteristics that the gel is broken simply and thoroughly by the residual acid without adding a gel breaker, and the gel can be broken by the residual acid when the residual acid meets hydrocarbon.
Gel breaking experiment 3,
In the experiment, kerosene is selected as a gel breaker, acid-based fracturing fluid and the kerosene are mixed according to different proportions during the experiment, the mixture is stirred for 60min at 60 ℃ and 100 ℃, and then residual acid fracturing fluid is taken out to measure the viscosity (the apparent viscosity at the experiment temperature is less than 5mPa & s, namely the complete gel breaking). The data are shown in Table 5.
Gel breaking experiment 4,
In the experiment, a large amount of water is added, and the viscosity of the gel is measured (the apparent viscosity is less than 5mPa & s at the experiment temperature, namely the gel is broken completely). The data are shown in Table 6.
TABLE 5 viscosity of viscoelastic acid-based fracturing fluids at different temperatures after 60min with addition of different amounts of kerosene
| Coal oil content/wt. -%) | 5 | 6 | 8 | 10 | 12 |
| viscosity/mPas at 60 DEG C | 4 | 3 | 2 | 1 | 1 |
| viscosity/mPas at 100 DEG C | 1 | 0 | 0 | 0 | 0 |
TABLE 6 viscosity of viscoelastic acid-based fracturing fluids at different temperatures after addition of different amounts of water
| Water/wt. -%) | 100 | 200 | 300 | 400 | 500 |
| viscosity/mPas at 60 |
50 | 25 | 5 | 1 | 0 |
| viscosity/mPas at 100 DEG C | 25 | 10 | 0 | 0 | 0 |
As can be seen from Table 4 and FIG. 2, the acid-based fracturing fluid prepared from the thickening agent lauramidopropyl betaine has viscosity decreasing with temperature rising, and the viscosity reaches 100mPa & s at 100 ℃, so that the viscosity required by fracturing sand carrying can be met.
As can be seen from table 5, at a low temperature of 60 ℃, 5wt.% of kerosene can meet the gel breaking requirement, and the lauramidopropyl betaine acid-based fracturing fluid can completely break gel within 60 ℃ to 100 ℃.
As can be seen from Table 6, the lauramidopropyl betaine acid-based fracturing fluid broke thoroughly when 3 times as much water was added.
Example 3:
the embodiment provides an acid-based fracturing fluid, which comprises the following components in percentage by mass:
a thickening agent: docosyltrimethylammonium chloride 4wt. -%)
31wt.% concentrated hydrochloric acid: 75.0wt. -%)
A counter ion salt: sodium benzoate 2.5wt. -%)
Corrosion inhibitor: 2.5wt.% of bromo-1, 4 (a-octylpyridine) butane
Iron ion stabilizer: iron citrate ion stabilizer 5.0wt. -%)
The balance being water.
The preparation process comprises the following steps:
according to the proportion, behenyl trimethyl ammonium chloride is added into water at normal temperature to be fully dissolved, corrosion inhibitors of bromo-1, 4 (a-octyl pyridine) butane, ferric citrate ion stabilizer and 31wt.% of concentrated hydrochloric acid are sequentially added to obtain an acidic thickening agent solution, counter ion salt sodium benzoate is dissolved into water, the two solutions are mixed and stirred uniformly, and a viscoelastic acid group fracturing fluid system can be obtained, wherein the data are shown in table 7.
TABLE 7 viscosity of behenyl trimethyl ammonium chloride acid based fracturing fluids as a function of temperature
| Temperature/. |
60 | 70 | 80 | 90 | 100 | 110 | 120 |
| viscosity/ |
180 | 165 | 150 | 138 | 124 | 100 | 60 |
After the viscoelastic acid-based fracturing fluid completes the acidizing fracturing effect in the stratum, gelled water needs to be broken when the viscoelastic acid-based fracturing fluid contacts crude oil, formation water or natural gas, otherwise, viscoelastic substances can have negative effects on the acidizing and stimulation effects of the stratum. The viscoelastic acid-based fracturing fluid has the great characteristics that the gel is broken simply and thoroughly by the residual acid without adding a gel breaker, and the gel can be broken by the residual acid when the residual acid meets hydrocarbon.
Gel breaking experiment 5,
In the experiment, kerosene is selected as a gel breaker, so that in the experiment, the kerosene is selected as a gel breaker, acid-based fracturing fluid and the kerosene are mixed according to different proportions in the experiment, the mixture is stirred for 60min at 60 ℃ and 110 ℃, and then residual acid fracturing fluid is taken out to measure the viscosity (the observed viscosity at the experiment temperature is less than 5mPa & s, namely complete gel breaking). The data are shown in Table 8.
Gel breaking experiment 6,
In the experiment, a large amount of water is added, and the viscosity of the gel is measured (the apparent viscosity is less than 5mPa & s at the experiment temperature, namely the gel is broken completely). The data are shown in Table 9.
TABLE 8 viscoelasticity of the acid-based fracturing fluids after 60min at different temperatures with different amounts of kerosene added
| Coal oil content/wt. -%) | 5 | 6 | 8 | 10 | 12 |
| viscosity/mPas at 60 DEG C | 4 | 3 | 2 | 1 | 1 |
| viscosity/mPas at 110 |
0 | 0 | 0 | 0 | 0 |
TABLE 9 viscosity of viscoelastic acid-based fracturing fluids at different temperatures after addition of different amounts of water
| Water/wt. -%) | 100 | 200 | 300 | 400 | 500 |
| viscosity/mPas at 60 |
60 | 40 | 5 | 1 | 0 |
| viscosity/mPas at 110 ℃ | 25 | 9 | 0 | 0 | 0 |
As can be seen from Table 7 and FIG. 3, the acid-based fracturing fluid prepared from the thickening agent behenyl trimethyl ammonium chloride has viscosity decreasing with temperature rising, and the viscosity reaches 100mPa & s at 110 ℃, so that the viscosity required by fracturing sand carrying can be met.
As can be seen from Table 8, at a low temperature of 60 ℃, the kerosene content of 5wt.% can meet the gel breaking requirement, and the behenyl trimethyl ammonium chloride acid base fracturing fluid can completely break gel within 60-110 ℃.
As can be seen from Table 9, the behenyl trimethyl ammonium chloride acid based fracturing fluid broke completely when 3 times more water was added.
Example 4:
in this example, the preparation method of comparative example 1 is to prepare an acid-based fracturing fluid, and the acid-based fracturing fluid comprises the following components in percentage by mass:
a thickening agent: dioctadecyldimethylammonium chloride 7.5wt. -%)
31wt.% concentrated hydrochloric acid: 50.0wt. -%)
A counter ion salt: 0.5wt.% of sodium dodecyl sulfate
Corrosion inhibitor: 0.5wt.% of bicyclic imidazoline
Iron ion stabilizer: 1.5wt.% of ethylenediaminetetraacetic acid sodium salt iron ion stabilizer
The balance being water.
The preparation process comprises the following steps:
according to the proportion, 31wt.% of concentrated hydrochloric acid is added into water at normal temperature, then corrosion inhibitor dicyclo imidazoline, ethylene diamine tetraacetic acid disodium salt iron ion stabilizer and dioctadecyl dimethyl ammonium chloride are sequentially added, the solution is fully dissolved to obtain an acidic thickening agent solution, a counter ion salt sodium dodecyl sulfate is dissolved into water, then the two solutions are mixed and stirred uniformly, and a viscoelastic acid base fracturing fluid system can be obtained, wherein the data are shown in table 10.
TABLE 10 viscosity as a function of temperature for different preparations of dioctadecyl dimethyl ammonium chloride acid based fracturing fluids
| Temperature/. |
60 | 70 | 80 | 90 | 100 | 110 | 120 |
| viscosity/mPas | 10 | 5 | 2 | 2 | 1 | 1 | 0 |
As can be seen from the data in tables 1 and 10, the thickening agent dioctadecyldimethylammonium chloride does not produce a viscoelastic acid-based fracturing fluid after being dissolved in acid, but does produce a viscoelastic acid-based fracturing fluid after being dissolved in water, so the thickening agent needs to be sufficiently dissolved in water.
Claims (7)
1. A viscoelastic acid-based fracturing fluid is prepared from a viscoelastic acid-based fracturing fluid composition;
the viscoelastic acid-based fracturing fluid composition comprises: a thickening agent: 2.0-7.5 parts by weight; 31-37 wt.% concentrated hydrochloric acid: 50.0 to 75.0 parts by weight; a counter ion salt: 0.5-2.5 parts by weight; corrosion inhibitor: 0.5-2.5 parts by weight; iron ion stabilizer: 1.5-5.0 weight portions; the viscoelastic acid-based fracturing fluid composition further comprises an appropriate amount of water, such that the sum of the components is 100 parts by weight; wherein the thickening agent comprises one or more of hexadecyl trimethyl ammonium chloride, docosyl trimethyl ammonium chloride, dihexadecyl dimethyl ammonium chloride, dioctadecyl dimethyl ammonium chloride and lauramidopropyl betaine;
the preparation method comprises the following steps:
a. dissolving a thickening agent in water, adding a corrosion inhibitor and an iron ion stabilizer, and then adding concentrated hydrochloric acid to obtain an acidic thickening agent liquid;
b. dissolving a counter ion salt in water to obtain a counter ion solution;
c. and mixing the acidic thickening agent liquid with the counter ion solution, and uniformly stirring to obtain the viscoelastic acid-based fracturing fluid system.
2. The viscoelastic acid-based fracturing fluid of claim 1, having the composition, based on 100% of its total weight:
a thickening agent: 2.0wt.% to 7.5 wt.%;
31-37 wt.% concentrated hydrochloric acid: 50.0wt.% to 75.0 wt.%;
a counter ion salt: 0.5wt.% to 2.5 wt.%;
corrosion inhibitor: 0.5wt.% to 2.5 wt.%;
iron ion stabilizer: 1.5wt.% to 5.0 wt.%;
water: and (4) the balance.
3. The viscoelastic acid based fracturing fluid of claim 1, wherein the counterion salt comprises one or more of sodium lauryl sulfate, sodium salicylate, sodium benzoate, potassium chloride.
4. The viscoelastic acid-based fracturing fluid of claim 1, wherein the corrosion inhibitor comprises one or more of chlorinated-1, 6- (α -octylpyridine) hexane, 1, 3-dichloropyridine-2 hydroxypropane, brominated-1, 4(α -octylpyridine) butane, oleamidoimidazoline, bicycloalkylimidazoline, benzimidazole.
5. The viscoelastic acid-based fracturing fluid of claim 1, wherein the iron ion stabilizer comprises one or more of a ferric citrate ion stabilizer, a sodium ethylenediaminetetraacetate iron ion stabilizer, and a ferric erythorbate ion stabilizer.
6. The viscoelastic acid-based fracturing fluid of claim 1, wherein,
the thickening agent comprises behenyl trimethyl ammonium chloride and dioctadecyl dimethyl ammonium chloride;
the counter ion salt comprises sodium dodecyl sulfate and sodium benzoate;
the corrosion inhibitor comprises brominated-1, 4 (alpha-octyl pyridine) butane and bicyclic imidazoline;
the iron ion stabilizer comprises a ferric citrate ion stabilizer and an ethylenediaminetetraacetic acid sodium salt iron ion stabilizer.
7. A method of preparing a viscoelastic acid based fracturing fluid according to any one of claims 1 to 6, comprising the steps of:
a. dissolving a thickening agent in water, adding a corrosion inhibitor and an iron ion stabilizer, and then adding concentrated hydrochloric acid to obtain an acidic thickening agent liquid;
b. dissolving a counter ion salt in water to obtain a counter ion solution;
c. and mixing the acidic thickening agent liquid with the counter ion solution, and uniformly stirring to obtain the viscoelastic acid-based fracturing fluid system.
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| CN109456751B (en) * | 2018-12-20 | 2022-01-25 | 西南石油大学 | Low-damage thickening acid and preparation method and application thereof |
| CN110373173A (en) * | 2019-07-23 | 2019-10-25 | 孙国平 | A kind of repeatable crosslinking clean fracturing fluid thickener of high temperature resistant |
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