CN114686198A - Low-concentration self-assembly guanidine gum fracturing fluid and preparation method thereof - Google Patents
Low-concentration self-assembly guanidine gum fracturing fluid and preparation method thereof Download PDFInfo
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- C09K8/62—Compositions for forming crevices or fractures
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- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
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- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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Abstract
The invention discloses a low-concentration self-assembly guanidine gum fracturing fluid which comprises the following raw materials in percentage by weight, based on 100% of weight ratio: 0.2 to 0.3 percent of hydroxypropyl guar gum, 0.3 to 0.4 percent of cleanup additive, 0.08 to 0.1 percent of multi-effect auxiliary agent, 0.8 to 1.1 percent of clay stabilizer, 0.08 to 0.1 percent of cross-linking agent, 0.1 to 0.15 percent of gel breaker and the balance of water. Meanwhile, the invention also discloses a preparation method of the guanidine gum fracturing fluid. Compared with the conventional guanidine gum fracturing fluid, the guanidine gum fracturing fluid provided by the invention can meet the temperature and shear resistant requirements of the fracturing fluid, greatly improve the sand carrying capacity of the fracturing fluid, reduce one third of the using amount of guanidine gum and have small damage degree to the stratum.
Description
Technical Field
The invention belongs to the technical field of hydraulic fracturing of oil and gas fields, and particularly relates to a low-concentration self-assembled guanidine gum fracturing fluid and a preparation method thereof.
Background
Hydraulic fracturing is a common oil-gas production increasing method at home and abroad at present, and is one of main measures for improving the yield of a low-permeability oil-gas field by forming cracks under the action of water-based fracturing fluid on an oil-gas layer and improving the migration condition of oil gas in the ground. The hydraulic fracturing fluid system used in various domestic oil fields is a fracturing fluid system formed by mainly taking guanidine gum and derivatives thereof as main agents and adding various additives, and has the advantages of low cost, high safety, strong operability, wide application range, good comprehensive performance and the like. But the conventional fracturing fluid system has the problems of large concentration of a guanidine gum thickening agent, more residues, poor gel breaking, incomplete flowback, formation damage and the like; if the residue is reduced and the formation damage is relieved by reducing the concentration of the thickening agent, the sand carrying capacity is obviously reduced, and the performance requirement of the fracturing fluid cannot be met. Meanwhile, the bactericide has insufficient drug resistance and broad spectrum.
In order to solve the problems, the most direct method for reducing the guar gum residues and insoluble substances is to reduce the dosage of the guar gum and reduce the content of solid-phase substances entering a stratum, thereby effectively reducing the damage of filtrate and residues of fracturing fluid to cracks and reservoirs. However, unilateral reduction of the guanidine gum concentration will result in a reduction in gelling effect, temperature resistance, shear resistance, viscoelasticity, proppant settling and other properties of the fracturing fluid gel system. Therefore, it is necessary to ensure the stable performance of the system by adding various synergists. However, the addition of various synergists can increase the cost of the fracturing fluid, and the field application and popularization are hindered.
In the prior art, patent CN 112574734A discloses a self-generated thermal fracturing fluid, the gel breaking time of a metal ion cross-linking agent is long, and the generated stratum damage is large; the cost of heat generation through chemical reactions is high. Patent CN 111574988A discloses a guanidine gum clean fracturing fluid for an oil well, wherein the using amount of the guanidine gum in the formula is not obviously reduced, and the treatment amount and difficulty of a return fluid are not reduced; the preparation of the multi-effect fracturing additive is carried out under the heating condition, the multi-effect fracturing additive is obtained through four-step reaction, the atom economy is greatly reduced due to more reaction steps, the production difficulty of products is increased, the effective components are lower than 65% of the total amount of the raw materials, the cost of partial raw materials is higher, the required production cost is multiplied, the economic efficiency is further reduced, and the popularization and the application are not facilitated in reality. Patent CN 107513383 a discloses a low-concentration guanidine gum fracturing fluid for gas wells, which has complex formulation, increases implementation complexity and difficulty in cost control. Meanwhile, due to the fact that too much medicament is added, damage to the stratum is increased, and difficulty in post-treatment of the flowback fluid is increased. Patent CN 111635750 a discloses a fracturing fluid, wherein the amount of guar gum is large, which causes great damage to the stratum. Patent CN 112080269 a discloses a micro-bubble fracturing fluid, which is only suitable for low-pressure formations, and in high-pressure formations, many advantages of the formulation will be lost, and the application range is limited. Patent CN 106905948A discloses a guanidine gum clean fracturing fluid, which has multiplied production cost and is not beneficial to popularization and application in reality, wherein a polynuclear cross-linking agent contains inorganic acid salt, and the raw material can increase formation damage after gel breaking; a large amount of complex medicaments also increase the difficulty of the post-treatment of the flowback liquid, and indirectly increase the cost. Patent CN 109097019A discloses a nanoparticle composite high-temperature guanidine gum fracturing fluid, wherein the surface modification of the nanoparticles contains a large amount of ethanol, which interferes with guanidine gum gelling, reduces the crosslinking performance of guanidine gum, and reduces atom economy through two-step reaction; the cross-linking agent is obtained by synthesis, which increases the cost. Patent CN 112391154A discloses an alcohol-containing fracturing fluid, when the concentration of ethylene glycol is high, the crosslinking time is prolonged, the dosage of a crosslinking agent is too large, the cost is increased, the jelly strength is reduced, the viscosity is reduced, the temperature resistance is reduced, and the sand carrying capacity is reduced. The patent CN 102352233A discloses a low-damage micromolecule guanidine gum fracturing fluid, the use amount of an organic cross-linking agent is large, excessive stratum damage can be caused, the treatment amount of a flowback fluid is large, and the indirect cost is increased. Patent CN 106085404A discloses a guanidine gum fracturing fluid system, wherein a cross-linking agent is a synthetic product, is not easy to degrade, and increases difficulty in post-treatment of flowback fluid; the biological gel breaker is easy to lose effectiveness in field use due to the influence of various bactericides in the stratum.
Therefore, how to reduce the concentration of the guanidine gum on the basis of not increasing the types and the cost of the auxiliary agents of the existing system, ensure the temperature resistance, the shear rheology and the sand carrying capacity of the fracturing fluid system, reduce the damage of the fracturing fluid and gel breaking residues to the stratum, and increase the broad spectrum of sterilization is a research focus and direction of the performance evaluation of the fracturing technology and the fracturing fluid at present.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the low-concentration self-assembled guanidine gum fracturing fluid and the preparation method thereof.
The low-concentration self-assembly guanidine gum fracturing fluid consists of the following raw materials in percentage by weight, wherein the raw materials are calculated according to the weight ratio of 100 percent: 0.2 to 0.3 percent of hydroxypropyl guar gum, 0.3 to 0.4 percent of cleanup additive, 0.08 to 0.1 percent of multi-effect auxiliary agent, 0.8 to 1.1 percent of clay stabilizer, 0.08 to 0.1 percent of cross-linking agent and 0.1 to 0.15 percent of gel breaker, and the balance of water;
the multi-effect auxiliary agent is prepared by the following method:
adding fly ash with the median particle size of 20-30 mu m into an organic amine solvent, carrying out ultrasonic vibration for 0.4-0.8h, standing for 0.8-1.5h, taking an upper suspension, adding glycoluril and water into the suspension, and carrying out ultrasonic vibration for 0.4-0.8 h.
Preferably, in the multi-effect auxiliary agent, the organic amine solvent is any one of tetramethyl-1, 3-propane diamine, N-dimethyl-1, 3-propane diamine or dimethylethanolamine.
Preferably, in the multi-effect auxiliary agent, the mass ratio of the fly ash to the organic amine solvent is (2-3): 5; the mass ratio of the suspension, glycoluril and water is 100:1: 0.5.
Preferably, the clay stabilizer is mixed by a mass ratio of 10: (1-4) a mixture of potassium chloride and a polyquaternium.
Preferably, the polyquaternary ammonium salt is any one of polydimethyl diallyl ammonium chloride, poly (trimethyl allyl ammonium chloride), poly (2-hydroxypropyl) -1, 1-N-dimethyl ammonium chloride, polyquaternary ammonium salt-7, polyquaternary ammonium salt-32 and polymethacryloxyethyl trimethyl ammonium chloride.
Preferably, the cleanup additive is nonylphenol polyoxyethylene ether.
Preferably, the cross-linking agent is borax.
Preferably, the breaker is ammonium persulfate.
The preparation method of the low-concentration self-assembly guanidine gum fracturing fluid comprises the following steps:
(1) weighing the raw materials according to the weight percentage, adding hydroxypropyl guar gum into water, stirring for 10-15 min, then sequentially adding a cleanup additive, a clay stabilizer and a multi-effect auxiliary agent, stirring for 30-40 min, uniformly mixing, standing and swelling for 2-4 h to prepare a base solution;
(2) and adding a cross-linking agent and a gel breaker into the base solution, and uniformly stirring to form jelly, thereby obtaining the low-concentration self-assembled guanidine gum fracturing fluid.
The fracturing fluid provided by the invention keeps constant temperature in a water bath at the temperature of more than or equal to 40 ℃, and can break gel after being completely hydrated.
The invention has the advantages that:
(1) the guanidine gum fracturing fluid provided by the invention contains a multi-effect assistant, has the effects of dispersing, synergizing and sterilizing, has a multi-effect, reduces the complexity of preparation of the guanidine gum fracturing fluid and reduces the cost;
(2) the guanidine gum fracturing fluid provided by the invention can break gum without a low-temperature initiator in a low-temperature environment, so that the system cost is reduced;
(3) compared with the conventional guanidine gum fracturing fluid, the fracturing fluid can meet the temperature and shear resistant requirements of the fracturing fluid, greatly improve the sand carrying capacity of the fracturing fluid and reduce the usage amount of the guanidine gum by one third;
(4) after gel breaking, the fracturing fluid provided by the invention has small damage degree to the stratum, especially to the stratum of a low-permeability oil field, and the fracturing flowback fluid is easy to treat.
Detailed Description
Example 1
1. The low-concentration self-assembled guanidine gum fracturing fluid consists of the following raw materials in percentage by weight: 2g of hydroxypropyl guar gum, 3g of cleanup additive, namely nonylphenol polyoxyethylene ether, 1g of multi-effect assistant, 11g of clay stabilizer, 0.9g of cross-linking agent borax, 1g of gel breaker ammonium persulfate and 981.1g of water;
the multi-effect auxiliary agent is prepared by the following method:
adding fly ash with the median particle size of 20-30 microns into an organic amine solvent dimethylethanolamine, standing for 1h after ultrasonic vibration for 0.5h, taking an upper suspension, adding glycoluril and water into the suspension, and then performing ultrasonic vibration for 0.5 h; wherein the mass ratio of the fly ash to the organic amine solvent is 2: 5; the mass ratio of the suspension to the glycoluril to the water is 100:1: 0.5;
the clay stabilizer is prepared from the following components in percentage by mass: 3.75 mixtures of potassium chloride and polydimethyldiallylamine chloride.
2. The preparation method of the low-concentration self-assembly guanidine gum fracturing fluid comprises the following steps:
(1) weighing the raw materials according to the weight percentage, adding hydroxypropyl guar gum into water, stirring for 10min, then sequentially adding a cleanup additive, a clay stabilizer and a multi-effect auxiliary agent, stirring for 30min, uniformly mixing, standing and swelling for 4h to prepare a base solution;
(2) and adding a cross-linking agent and a gel breaker into the base solution, and uniformly stirring to form jelly, thereby obtaining the low-concentration self-assembled guanidine gum fracturing fluid.
The obtained fracturing fluid can be completely broken after 6 hours at 40 ℃.
Example 2
1. The low-concentration self-assembly guanidine gum fracturing fluid consists of the following raw materials in percentage by weight: 2g of hydroxypropyl guar gum, 3.5g of cleanup additive nonylphenol polyoxyethylene ether, 0.9g of multi-effect auxiliary agent, 11g of clay stabilizer, 0.9g of cross-linking agent borax, 1g of gel breaker ammonium persulfate and 980.7g of water;
the multi-effect auxiliary agent is the same as the multi-effect auxiliary agent in the embodiment 1;
the clay stabilizer is prepared from the following components in percentage by mass 10: 2.2 mixtures of potassium chloride and polydimethyldiallylamine chloride.
2. The preparation method of the low-concentration self-assembled guanidine gum fracturing fluid is the same as that of example 1.
The obtained fracturing fluid can be completely broken after 6 hours at 40 ℃.
Example 3
1. The low-concentration self-assembly guanidine gum fracturing fluid consists of the following raw materials in percentage by weight: 2g of hydroxypropyl guar gum, 4g of cleanup additive, namely nonylphenol polyoxyethylene ether, 0.8g of multi-effect auxiliary agent, 11g of clay stabilizer, 1g of cross-linking agent borax, 1g of gel breaker ammonium persulfate and 980.2g of water;
the multi-effect auxiliary agent is the same as the multi-effect auxiliary agent in the embodiment 1;
the clay stabilizer is prepared from the following components in percentage by mass 10: 1 potassium chloride and polydimethyldiallylamine chloride.
2. The preparation method of the low-concentration self-assembled guanidine gum fracturing fluid is the same as that of example 1.
The obtained fracturing fluid can be completely broken after 6 hours at 40 ℃.
Example 4
1. The low-concentration self-assembly guanidine gum fracturing fluid consists of the following raw materials in percentage by weight: 2.5g of hydroxypropyl guar gum, 3.5g of cleanup additive nonylphenol polyoxyethylene ether, 0.9g of multi-effect auxiliary agent, 11g of clay stabilizer, 0.8g of cross-linking agent borax, 1.2g of gel breaker ammonium persulfate and 980.1g of water;
the multi-effect auxiliary agent is the same as the multi-effect auxiliary agent in the embodiment 1;
the clay stabilizer is prepared from the following components in percentage by mass: 2.2 mixtures of potassium chloride and polydimethyldiallylamine chloride.
2. The preparation method of the low-concentration self-assembled guanidine gum fracturing fluid is the same as that of example 1.
The obtained fracturing fluid can be completely broken after 6 hours at 40 ℃.
Example 5
1. The low-concentration self-assembly guanidine gum fracturing fluid consists of the following raw materials in percentage by weight: 3g of hydroxypropyl guar gum, 3g of cleanup additive nonylphenol polyoxyethylene ether, 1g of multi-effect assistant, 11g of clay stabilizer, 0.9g of cross-linking agent borax, 1.5g of gel breaker ammonium persulfate and 979.6g of water;
the multi-effect auxiliary agent is the same as the multi-effect auxiliary agent in the embodiment 1;
the clay stabilizer is prepared from the following components in percentage by mass: 3.75 mixture of potassium chloride and polydimethyldiallylchloride.
2. The preparation method of the low-concentration self-assembled guanidine gum fracturing fluid is the same as that of example 1.
The obtained fracturing fluid can be completely broken after 6 hours at 50 ℃.
Example 6
1. The low-concentration self-assembly guanidine gum fracturing fluid consists of the following raw materials in percentage by weight: 3g of hydroxypropyl guar gum, 3g of cleanup additive nonylphenol polyoxyethylene ether, 0.9g of multi-effect assistant, 11g of clay stabilizer, 0.9g of cross-linking agent borax, 1.5g of gel breaker ammonium persulfate and 979.7g of water;
the multi-effect auxiliary agent is the same as the multi-effect auxiliary agent in the embodiment 1;
the clay stabilizer is prepared from the following components in percentage by mass: 2.2 mixture of potassium chloride and polydimethyldiallylchloride.
2. The preparation method of the low-concentration self-assembled guanidine gum fracturing fluid is the same as that of example 1.
The obtained fracturing fluid can be completely broken after 2 hours at 60 ℃.
Example 7
1. The low-concentration self-assembly guanidine gum fracturing fluid consists of the following raw materials in percentage by weight: 3g of hydroxypropyl guar gum, 3g of cleanup additive, namely nonylphenol polyoxyethylene ether, 0.8g of multi-effect auxiliary agent, 11g of clay stabilizer, 1g of cross-linking agent, borax, 1.5g of gel breaker ammonium persulfate and 979.7g of water;
the multi-effect auxiliary agent is the same as the multi-effect auxiliary agent in the embodiment 1;
the clay stabilizer is prepared from the following components in percentage by mass: 1 and poly 2-hydroxypropyl-1, 1-N-dimethylammonium chloride.
2. The preparation method of the low-concentration self-assembled guanidine gum fracturing fluid is the same as that of example 1.
The obtained fracturing fluid can be completely broken after 2.5 hours at the temperature of 60 ℃.
Example 8
1. The low-concentration self-assembly guanidine gum fracturing fluid consists of the following raw materials in percentage by weight: 3g of hydroxypropyl guar gum, 4g of cleanup additive, namely nonylphenol polyoxyethylene ether, 0.8g of multi-effect auxiliary agent, 8g of clay stabilizer, 1g of cross-linking agent, borax, 1.5g of gel breaker ammonium persulfate and 981.7g of water;
the multi-effect auxiliary agent is prepared by the following method:
adding fly ash with the median particle size of 20-30 mu m into an organic amine solvent tetramethyl-1, 3-propane diamine, standing for 0.8h after ultrasonic vibration for 0.4h, taking an upper suspension, adding glycoluril and water into the suspension, and then performing ultrasonic vibration for 0.4 h; wherein the mass ratio of the fly ash to the organic amine solvent is 3: 5; the mass ratio of the suspension to the glycoluril to the water is 100:1: 0.5;
the clay stabilizer is prepared from the following components in percentage by mass: 4 potassium chloride and polyquaternium-7.
2. The preparation method of the low-concentration self-assembled guanidine gum fracturing fluid is the same as that of example 1.
The obtained fracturing fluid can be completely broken after 2 hours at 70 ℃.
Example 9
1. The low-concentration self-assembly guanidine gum fracturing fluid consists of the following raw materials in percentage by weight: 3g of hydroxypropyl guar gum, 3.5g of cleanup additive nonylphenol polyoxyethylene ether, 0.8g of multi-effect assistant, 10g of clay stabilizer, 1g of cross-linking agent borax, 1.5g of gel breaker ammonium persulfate and 980.2g of water;
the multi-effect auxiliary agent is prepared by the following method:
adding fly ash with the median particle size of 20-30 mu m into an organic amine solvent N, N-dimethyl-1, 3-propane diamine, carrying out ultrasonic vibration for 0.8h, standing for 1.5h, taking an upper suspension, adding glycoluril and water into the suspension, and carrying out ultrasonic vibration for 0.8 h; wherein the mass ratio of the fly ash to the organic amine solvent is 3: 5; the mass ratio of the suspension to the glycoluril to the water is 100:1: 0.5;
the clay stabilizer is prepared from the following components in percentage by mass: 4 potassium chloride and polymethacryloxyethyltrimethylammonium chloride.
2. The preparation method of the low-concentration self-assembly guanidine gum fracturing fluid comprises the following steps:
(1) weighing the raw materials according to the weight percentage, adding hydroxypropyl guar gum into water, stirring for 15min, then sequentially adding a cleanup additive, a clay stabilizer and a multi-effect assistant, stirring for 40min, uniformly mixing, standing and swelling for 2h to prepare a base solution;
(2) and adding a cross-linking agent and a gel breaker into the base solution, and uniformly stirring to form jelly, thereby obtaining the low-concentration self-assembled guanidine gum fracturing fluid.
The obtained fracturing fluid can be completely broken after 2 hours at 70 ℃.
The conventional bactericide dodecyl dimethyl benzyl ammonium chloride is adopted to replace the multi-effect assistant of the invention, as shown in comparative examples 1-3.
Comparative example 1
The procedure of example 1 was otherwise the same as for the dodecyldimethylbenzylammonium chloride bactericide used in place of the multi-effect adjuvant.
The obtained fracturing fluid can be completely broken after 12 hours at 40 ℃.
Comparative example 2
The procedure of example 4 was otherwise the same as for the dodecyldimethylbenzylammonium chloride bactericide used in place of the multi-effect adjuvant.
The obtained fracturing fluid can be completely broken after 12 hours at 40 ℃.
Comparative example 3
The procedure of example 5 was followed except that dodecyl dimethyl benzyl ammonium chloride bactericide was used instead of the multi-effect adjuvant.
The obtained fracturing fluid can be completely broken after 24 hours at 50 ℃.
Comparative example 4
Glycoluril is not added when the multi-effect auxiliary agent is prepared, and the method is otherwise the same as the method in example 1, and specifically comprises the following steps:
1. the low-concentration self-assembly guanidine gum fracturing fluid consists of the following raw materials in percentage by weight: 2g of hydroxypropyl guar gum, 3g of cleanup additive, namely nonylphenol polyoxyethylene ether, 1g of multi-effect assistant, 11g of clay stabilizer, 0.9g of cross-linking agent borax, 1g of gel breaker ammonium persulfate and 981.1g of water;
the multi-effect auxiliary agent is prepared by the following method:
adding fly ash with the median particle size of 20-30 microns into an organic amine solvent dimethylethanolamine, standing for 1h after ultrasonic vibration for 0.5h, taking an upper suspension, then adding water into the suspension, and then performing ultrasonic vibration for 0.5 h; wherein the mass ratio of the fly ash to the organic amine solvent is 2: 5; the mass ratio of the suspension to the water is 100: 0.5;
the clay stabilizer is prepared from the following components in percentage by mass 10: 3.75 mixtures of potassium chloride and polydimethyldiallylamine chloride.
2. The preparation method of the low-concentration self-assembled guanidine gum fracturing fluid is the same as that of example 1.
The obtained fracturing fluid can be completely broken after 6 hours at 40 ℃.
Comparative example 5
The amount of guar gum is increased and the amount of water is decreased, otherwise, the same as in example 1, specifically as follows:
1. the low-concentration self-assembly guanidine gum fracturing fluid consists of the following raw materials in percentage by weight: 3g of hydroxypropyl guar gum, 3g of cleanup additive nonylphenol polyoxyethylene ether, 1g of dodecyl dimethyl benzyl ammonium chloride bactericide, 11g of clay stabilizer, 0.9g of cross-linking agent borax, 1g of gel breaker ammonium persulfate and 980.1g of water;
the clay stabilizer was the same as in example 1.
2. The preparation method of the low-concentration self-assembled guanidine gum fracturing fluid is the same as that of example 1.
The obtained fracturing fluid can be completely broken after 2 hours at 60 ℃.
Performance detection
The formula of the guanidine gum fracturing fluid meets the evaluation standard of the fracturing fluid: under the condition of meeting construction conditions, the viscosity is not lower than 50 mPas, the antibacterial property of the base fluid reaches at least 72h, the viscosity reduction requirement of the base fluid is not more than 20%, and other sand carrying capacity and core damage detection indexes are respectively shown in tables 1-5.
1. In each example and comparative example, the temperature resistance of the fracturing fluid containing 0.2%, 0.25% and 0.3% of hydroxypropyl guar gum and the corresponding antibacterial performance indexes of the base fluid are shown in tables 1 to 3 respectively.
TABLE 1 temperature resistance of fracturing fluid containing 0.2% hydroxypropyl guar gum, antibacterial performance index of base fluid
TABLE 2 temperature resistance of fracturing fluid containing 0.25% hydroxypropyl guar gum, antibacterial performance index of base fluid
TABLE 3 temperature resistance of fracturing fluid containing 0.3% hydroxypropyl guar gum, antibacterial performance index of base fluid
As can be seen from tables 1 to 3, the guanidine gum fracturing fluid provided by the invention has excellent temperature resistance and antibacterial property of the corresponding base fluid, and is obviously superior to the fracturing fluid added with the conventional bactericide of dodecyl dimethyl benzyl ammonium chloride in a comparative example.
2. Detecting sand-carrying capacity of fracturing fluid
TABLE 4 Sand carrying Capacity of fracturing fluid
Remarking: and the viscosity of the fracturing fluid is lower than 50mPa & s of the industry standard at the temperature of 80 ℃, and the fracturing fluid does not reach the standard, so that the sand carrying capacity detection is not carried out.
As can be seen from table 4, the sand carrying capacity of examples 1, 2 and 3 (0.2% hydroxypropyl guar) is about 7 times that of comparative example 1 and about 1.8 times that of comparative example 3 at 25 ℃ and normal temperature; examples 1, 2, 3 are about 2.5 times as high as comparative example 1 at 42 ℃, and are comparable to comparative example 3;
examples 5, 6, and 7 (0.3% hydroxypropyl guar gum) had a sand carrying capacity of about 7 times that of comparative example 3 at 25 ℃ at room temperature; at 42 ℃, the temperature is about 3 times that of the comparative example 3; at 80 ℃, it is about 1.8 times of that of comparative example 3.
Examples 1, 2, and 3 (0.2% hydroxypropyl guar gum) had a sand carrying capacity of about 5 times that of comparative example 4 at 25 ℃ at room temperature; examples 1, 2, 3 are about 2 times as high as comparative example 4 at 42 ℃.
Therefore, the sand carrying capacity of the guanidine gum fracturing fluid provided by the invention is obviously better than that of a comparative example.
3. Detecting core damage performance index of fracturing fluid
Table 5 core damage performance of fracturing fluids
As can be seen from Table 5, by comparing the damage of the cores, the fracturing fluid disclosed by the invention has small damage degree to the cores and more excellent performance. In example 1, the damage to the core was less in the case where the amount of hydroxypropyl guar used was reduced by 1/3, compared to comparative example 5.
Claims (9)
1. The low-concentration self-assembly guanidine gum fracturing fluid is characterized in that: the composite material is composed of the following raw materials in percentage by weight, calculated according to the weight ratio of 100%: 0.2 to 0.3 percent of hydroxypropyl guar gum, 0.3 to 0.4 percent of cleanup additive, 0.08 to 0.1 percent of multi-effect auxiliary agent, 0.8 to 1.1 percent of clay stabilizer, 0.08 to 0.1 percent of cross-linking agent and 0.1 to 0.15 percent of gel breaker, and the balance of water;
the multi-effect auxiliary agent is prepared by the following method:
adding the fly ash with the median particle size of 20-30 mu m into an organic amine solvent, carrying out ultrasonic vibration for 0.4-0.8h, standing for 0.8-1.5h, taking an upper suspension, adding glycoluril and water into the suspension, and carrying out ultrasonic vibration for 0.4-0.8 h.
2. The low concentration self-assembled guanidine gum fracturing fluid of claim 1, wherein: in the multi-effect auxiliary agent, the organic amine solvent is any one of tetramethyl-1, 3-propane diamine, N-dimethyl-1, 3-propane diamine or dimethylethanolamine.
3. The low concentration self-assembled guanidine gum fracturing fluid of claim 2, wherein: in the multi-effect auxiliary agent, the mass ratio of the fly ash to the organic amine solvent is (2-3): 5; the mass ratio of the suspension, the glycoluril and the water is 100:1: 0.5.
4. The low concentration self-assembling guanidine gum fracturing fluid of claim 1, wherein: the clay stabilizer is prepared from the following components in percentage by mass: (1-4) a mixture of potassium chloride and a polyquaternium.
5. The low concentration self-assembling guanidine gum fracturing fluid of claim 4, wherein: the polyquaternary ammonium salt is any one of polydimethyl diallyl ammonium chloride, polytrimethylallyl ammonium chloride, poly 2-hydroxypropyl-1, 1-N-dimethyl ammonium chloride, polyquaternary ammonium salt-7, polyquaternary ammonium salt-32 and polymethacryloxyethyl trimethyl ammonium chloride.
6. The low concentration self-assembling guanidine gum fracturing fluid of claim 1, wherein: the cleanup additive is nonylphenol polyoxyethylene ether.
7. The low concentration self-assembling guanidine gum fracturing fluid of claim 1, wherein: the cross-linking agent is borax.
8. The low concentration self-assembling guanidine gum fracturing fluid of claim 1, wherein: the gel breaker is ammonium persulfate.
9. The method for preparing the low-concentration self-assembled guanidine gum fracturing fluid as claimed in claim 1, which is characterized in that: the method comprises the following steps:
(1) weighing the raw materials according to the weight percentage, adding hydroxypropyl guar gum into water, stirring for 10-15 min, then sequentially adding a cleanup additive, a clay stabilizer and a multi-effect assistant, stirring for 30-40 min, uniformly mixing, standing and swelling for 2-4 h to prepare a base solution;
(2) and adding a cross-linking agent and a gel breaker into the base solution, and uniformly stirring to form jelly, thereby obtaining the low-concentration self-assembled guanidine gum fracturing fluid.
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