CN114686198B - Low-concentration self-assembled guanidine gum fracturing fluid and preparation method thereof - Google Patents
Low-concentration self-assembled guanidine gum fracturing fluid and preparation method thereof Download PDFInfo
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- C09K8/60—Compositions for stimulating production by acting on the underground formation
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- 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-assembled guanidine gum fracturing fluid which comprises the following raw materials in percentage by weight as per 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. 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 requirements of temperature resistance and shearing resistance of the fracturing fluid, greatly improve the sand carrying capacity of the fracturing fluid, reduce the use amount of one third of guanidine gum, and has small damage degree to 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
The hydraulic fracturing is a common oil and gas yield increasing method at home and abroad at present, cracks are formed by utilizing the action of a water-based fracturing fluid on an oil and gas layer, the migration condition of oil and gas underground is improved, and the hydraulic fracturing is one of main measures for improving the yield of a low-permeability oil and gas field. The hydraulic fracturing fluid system used in each domestic oil field mainly takes guanidine gum and derivatives thereof as main agents, and is formed by adding various additives, and has the advantages of low cost, high safety, strong operability, wide application range, good comprehensive performance and the like. However, the conventional fracturing fluid system has the problems of large concentration of guanidine gum thickener, more residues, poor gum breaking, incomplete flowback, formation damage and the like; if the concentration of the thickener is reduced to reduce residues and reduce formation damage, 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 guanidine gum residues and insoluble matters is to reduce the guanidine gum consumption and the content of solid phase substances entering the stratum, so that the damage of fracturing fluid filtrate and residues to cracks and reservoirs is effectively reduced. However, unilateral reduction of the guanidine gum concentration can lead to reduction of the gelling effect, temperature resistance, shearing resistance, viscoelasticity, proppant settlement and other performances of the fracturing fluid gel system. Therefore, various synergists are required to be added to ensure stable system performance. However, the addition of various synergists can increase the cost of the fracturing fluid, which leads to the prevention of popularization in field application.
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 produced stratum is greatly damaged; the cost of generating heat by chemical reactions is high. Patent CN 111574988A discloses a guanidine gum clean fracturing fluid for an oil well, wherein the amount of guanidine gum in a formula is not obviously reduced, and the treatment capacity and difficulty of flowback fluid are not reduced; preparation of multi-effect fracturing aid under heating condition, the multi-effect fracturing aid obtained through four-step reaction has the advantages that the atomic economy is greatly reduced due to the fact that the number of reaction steps is large, the production difficulty of products is increased, the effective components are lower than 65% of the total amount of raw materials, the cost of part of raw materials is high, the required production cost is increased by times, the economic efficiency is further reduced, and popularization and application in reality are not facilitated. Patent CN 107513383A discloses a low-concentration guanidine gum fracturing fluid for gas wells, which has complex formulation composition and increases implementation complexity and cost control difficulty. Meanwhile, due to excessive addition of the medicaments, the damage to the stratum is increased, and the difficulty in post-treatment of the flowback fluid is increased. Patent CN 111635750A discloses a fracturing fluid in which the amount of guanidine gum is large, resulting in large formation damage. Patent CN 112080269A discloses a micro-bubble fracturing fluid which is only suitable for low-pressure stratum, and the formulation has a limited application range because various advantages of the formulation are lost in high-pressure stratum. Patent CN 106905948A discloses a guanidine gum clean fracturing fluid, the production cost is multiplied, which is unfavorable for popularization and application in reality, wherein the polynuclear cross-linking agent contains inorganic acid salt, and the raw material can increase formation injury after gum breaking; the difficulty of the post-treatment of the flowback fluid is increased by a large amount of complex medicaments, and the cost is indirectly increased. Patent CN 109097019A discloses a nanoparticle composite Gao Wengua glue fracturing fluid, wherein a large amount of ethanol is contained in the surface modification of nanoparticles, so that the glue formation of the guanidine gum is interfered, the crosslinking performance of the guanidine gum is reduced, and the atom economy is reduced by 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 increased, the consumption of a crosslinking agent is excessive, the cost is increased, the gel strength is reduced, the viscosity is reduced, the temperature resistance is reduced, and the sand carrying capacity is reduced. Patent CN 102352233A discloses a low-damage small-molecule guanidine gum fracturing fluid, the consumption of an organic cross-linking agent is large, the damage to the stratum which is too high can be caused, the treatment capacity of 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 the difficulty in post-treatment of flowback fluid; the biological gel breaker is extremely susceptible to failure in field use due to the influence of various bactericides in the stratum.
Therefore, how to reduce the concentration of guanidine gum on the basis of not increasing the types and cost of the auxiliary agent of the existing system, and simultaneously ensure the temperature resistance, shear rheology and sand carrying capacity of a fracturing fluid system, reduce the damage of fracturing fluid and gel breaking residues to stratum, and increase the broad-spectrum sterilization performance is the research focus and direction of the prior fracturing technology and fracturing fluid performance evaluation.
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, and the low-concentration self-assembled guanidine gum fracturing fluid has the advantages of good atom economy, low cost, low concentration, low residue content and small damage to a rock core.
The low-concentration self-assembled guanidine gum fracturing fluid comprises the following raw materials in percentage by weight as per 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-propanediamine, N-dimethyl-1, 3-propanediamine 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, a step of; the mass ratio of the suspension to the glycoluril to the water is 100:1:0.5.
Preferably, the clay stabilizer is prepared from the following components in percentage by mass: the mixture of potassium chloride and polyquaternium of (1-4).
Preferably, the poly quaternary ammonium salt is any one of polydimethyldiallyl ammonium chloride, poly trimethylallyl ammonium chloride, poly 2-hydroxypropyl-1, 1-N-dimethyl ammonium chloride, poly quaternary ammonium salt-7, poly quaternary ammonium salt-32 and poly methacryloyloxyethyl 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-assembled guanidine gum fracturing fluid comprises the following steps:
(1) Weighing raw materials according to 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, and preparing a base solution;
(2) And adding a cross-linking agent and a gel breaker into the base solution, and stirring and uniformly mixing to form gel, thus obtaining the low-concentration self-assembled guanidine gum fracturing fluid.
The fracturing fluid provided by the invention is kept at a constant temperature in a water bath with the temperature of more than or equal to 40 ℃ and can be broken after being completely hydrated.
The invention has the advantages that:
(1) The guanidine gum fracturing fluid provided by the invention contains multiple-effect auxiliary agents, has the effects of dispersing, enhancing efficiency and sterilizing, plays a role in multiple effects, 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 complete gum breaking 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 temperature and shear resistant requirements of the fracturing fluid can be met, the sand carrying capacity of the fracturing fluid is greatly improved, and the usage amount of one third of guanidine gum is reduced;
(4) The fracturing fluid provided by the invention has the advantages that after gel breaking, the damage degree of the gel breaking fluid to the stratum is small, especially the damage degree to the stratum of the low permeability oilfield is small, and the fracturing flowback fluid is easy to treat.
Detailed Description
Example 1
1. A low-concentration self-assembled guanidine gum fracturing fluid is composed of the following raw materials in percentage by weight: 2g of hydroxypropyl guar gum, 3g of a cleanup additive nonylphenol polyoxyethylene ether, 1g of a multi-effect auxiliary agent, 11g of a clay stabilizer, 0.9g of a cross-linking agent borax and 1g of a 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 mu m into an organic amine solvent dimethylethanolamine, carrying out ultrasonic vibration for 0.5h, standing for 1h, taking an upper suspension, adding glycoluril and water into the suspension, and carrying out ultrasonic vibration for 0.5 h; wherein the mass ratio of the fly ash to the organic amine solvent is 2:5, a step of; the mass ratio of the suspension to the glycoluril to the water is 100:1:0.5;
the clay stabilizer comprises the following components in percentage by mass: 3.75 and polydimethyldiallylamine chloride.
2. The preparation method of the low-concentration self-assembled guanidine gum fracturing fluid comprises the following steps:
(1) Weighing raw materials according to 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, and preparing a base solution;
(2) And adding a cross-linking agent and a gel breaker into the base solution, and stirring and uniformly mixing to form gel, thus obtaining the low-concentration self-assembled guanidine gum fracturing fluid.
The fracturing fluid obtained can be completely broken after 6 hours at 40 ℃.
Example 2
1. A low-concentration self-assembled guanidine gum fracturing fluid is composed of the following raw materials in percentage by weight: 2g of hydroxypropyl guar gum, 3.5g of discharge assisting agent nonylphenol polyoxyethylene ether, 0.9g of multi-effect auxiliary agent, 11g of clay stabilizer, 0.9g of cross-linking agent borax and 1g of breaker ammonium persulfate, and 980.7g of water;
the multi-effect auxiliary agent is the same as in the embodiment 1;
the clay stabilizer comprises the following components in percentage by mass: 2.2 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 the embodiment 1.
The fracturing fluid obtained can be completely broken after 6 hours at 40 ℃.
Example 3
1. A low-concentration self-assembled guanidine gum fracturing fluid is composed of the following raw materials in percentage by weight: 2g of hydroxypropyl guar gum, 4g of a cleanup additive nonylphenol polyoxyethylene ether, 0.8g of a multi-effect auxiliary agent, 11g of a clay stabilizer, 1g of a cross-linking agent borax and 1g of a breaker ammonium persulfate, and 980.2g of water;
the multi-effect auxiliary agent is the same as in the embodiment 1;
the clay stabilizer comprises the following components in percentage by mass: 1 and polydimethyldiallylamine chloride.
2. The preparation method of the low-concentration self-assembled guanidine gum fracturing fluid is the same as that of the embodiment 1.
The fracturing fluid obtained can be completely broken after 6 hours at 40 ℃.
Example 4
1. A low-concentration self-assembled guanidine gum fracturing fluid is composed of the following raw materials in percentage by weight: 2.5g of hydroxypropyl guar gum, 3.5g of discharge assisting agent nonylphenol polyoxyethylene ether, 0.9g of multi-effect auxiliary agent, 11g of clay stabilizer, 0.8g of cross-linking agent borax and 1.2g of breaker ammonium persulfate, 980.1g of water;
the multi-effect auxiliary agent is the same as in the embodiment 1;
the clay stabilizer comprises the following components in percentage by mass: 2.2 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 the embodiment 1.
The fracturing fluid obtained can be completely broken after 6 hours at 40 ℃.
Example 5
1. A low-concentration self-assembled guanidine gum fracturing fluid is composed of the following raw materials in percentage by weight: 3g of hydroxypropyl guar gum, 3g of discharge assisting agent nonylphenol polyoxyethylene ether, 1g of multi-effect auxiliary agent, 11g of clay stabilizer, 0.9g of cross-linking agent borax and 1.5g of breaker ammonium persulfate, and 979.6g of water;
the multi-effect auxiliary agent is the same as in the embodiment 1;
the clay stabilizer comprises the following components in percentage by mass: 3.75 and polydimethyldiallylamine chloride.
2. The preparation method of the low-concentration self-assembled guanidine gum fracturing fluid is the same as that of the embodiment 1.
The fracturing fluid obtained can be completely broken after 6 hours at 50 ℃.
Example 6
1. A low-concentration self-assembled guanidine gum fracturing fluid is composed of the following raw materials in percentage by weight: 3g of hydroxypropyl guar gum, 3g of discharge assisting agent nonylphenol polyoxyethylene ether, 0.9g of multi-effect auxiliary agent, 11g of clay stabilizer, 0.9g of cross-linking agent borax and 1.5g of breaker ammonium persulfate, and 979.7g of water;
the multi-effect auxiliary agent is the same as in the embodiment 1;
the clay stabilizer comprises the following components in percentage by mass: 2.2 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 the embodiment 1.
The fracturing fluid can be completely broken after 2 hours at 60 ℃.
Example 7
1. A low-concentration self-assembled guanidine gum fracturing fluid is composed of the following raw materials in percentage by weight: 3g of hydroxypropyl guar gum, 3g of discharge assisting agent nonylphenol polyoxyethylene ether, 0.8g of multi-effect auxiliary agent, 11g of clay stabilizer, 1g of cross-linking agent borax and 1.5g of breaker ammonium persulfate, and 979.7g of water;
the multi-effect auxiliary agent is the same as in the embodiment 1;
the clay stabilizer comprises 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 the embodiment 1.
The fracturing fluid obtained can be completely broken after 2.5 hours at 60 ℃.
Example 8
1. A low-concentration self-assembled guanidine gum fracturing fluid is composed of the following raw materials in percentage by weight: 3g of hydroxypropyl guar gum, 4g of discharge assisting agent nonylphenol polyoxyethylene ether, 0.8g of multi-effect auxiliary agent, 8g of clay stabilizer, 1g of cross-linking agent borax and 1.5g of 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 tetramethyl-1, 3-propanediamine serving as an organic amine solvent, carrying out ultrasonic vibration for 0.4h, standing for 0.8h, taking an upper suspension, adding glycoluril and water into the suspension, and carrying out ultrasonic vibration for 0.4 h; wherein the mass ratio of the fly ash to the organic amine solvent is 3:5, a step of; the mass ratio of the suspension to the glycoluril to the water is 100:1:0.5;
the clay stabilizer comprises the following components in percentage by mass: 4 and polyquaternium-7.
2. The preparation method of the low-concentration self-assembled guanidine gum fracturing fluid is the same as that of the embodiment 1.
The obtained fracturing fluid can be completely broken through 2h at 70 ℃.
Example 9
1. A low-concentration self-assembled guanidine gum fracturing fluid is composed of the following raw materials in percentage by weight: 3g of hydroxypropyl guar gum, 3.5g of discharge assisting agent nonylphenol polyoxyethylene ether, 0.8g of multi-effect auxiliary agent, 10g of clay stabilizer, 1g of cross-linking agent borax and 1.5g of 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-propylene 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, a step of; the mass ratio of the suspension to the glycoluril to the water is 100:1:0.5;
the clay stabilizer comprises the following components in percentage by mass: 4 and polymethacryloxyethyl trimethyl ammonium chloride.
2. The preparation method of the low-concentration self-assembled guanidine gum fracturing fluid comprises the following steps:
(1) Weighing raw materials according to weight percentage, adding hydroxypropyl guar gum into water, stirring for 15min, then sequentially adding a cleanup additive, a clay stabilizer and a multi-effect auxiliary agent, stirring for 40min, uniformly mixing, standing and swelling for 2h, and preparing a base solution;
(2) And adding a cross-linking agent and a gel breaker into the base solution, and stirring and uniformly mixing to form gel, thus obtaining the low-concentration self-assembled guanidine gum fracturing fluid.
The obtained fracturing fluid can be completely broken through 2h at 70 ℃.
The conventional bactericide dodecyl dimethyl benzyl ammonium chloride is adopted to replace the multi-effect auxiliary agent of the invention, and the comparative examples 1-3 are shown.
Comparative example 1
Dodecyl dimethyl benzyl ammonium chloride bactericide is used to replace a multi-effect auxiliary agent, and the example 1 is the same as that of the other example.
The obtained fracturing fluid can be completely broken through 12 h at 40 ℃.
Comparative example 2
Dodecyl dimethyl benzyl ammonium chloride bactericide is used to replace a multi-effect auxiliary agent, and the example 4 is the same as that of the other example.
The obtained fracturing fluid can be completely broken through 12 h at 40 ℃.
Comparative example 3
Dodecyl dimethyl benzyl ammonium chloride bactericide is used to replace a multi-effect auxiliary agent, and the example 5 is the same as that of the other example.
The obtained fracturing fluid can be completely broken through 24 h at 50 ℃.
Comparative example 4
The process is carried out in the same way as in example 1 without glycoluril, and the process is as follows:
1. a low-concentration self-assembled guanidine gum fracturing fluid is composed of the following raw materials in percentage by weight: 2g of hydroxypropyl guar gum, 3g of a cleanup additive nonylphenol polyoxyethylene ether, 1g of a multi-effect auxiliary agent, 11g of a clay stabilizer, 0.9g of a cross-linking agent borax and 1g of a 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 mu m into an organic amine solvent dimethylethanolamine, carrying out ultrasonic vibration for 0.5h, standing for 1h, taking an upper suspension, adding water into the suspension, and carrying out ultrasonic vibration for 0.5 h; wherein the mass ratio of the fly ash to the organic amine solvent is 2:5, a step of; the mass ratio of the suspension to the water is 100:0.5;
the clay stabilizer comprises the following components in percentage by mass: 3.75 and polydimethyldiallylamine chloride.
2. The preparation method of the low-concentration self-assembled guanidine gum fracturing fluid is the same as that of the embodiment 1.
The fracturing fluid obtained can be completely broken after 6 hours at 40 ℃.
Comparative example 5
The amount of guanidine gum was increased and the amount of water was decreased, as described in example 1, except that:
1. a low-concentration self-assembled guanidine gum fracturing fluid is composed of the following raw materials in percentage by weight: 3g of hydroxypropyl guar gum, 3g of discharge assisting agent nonylphenol polyoxyethylene ether, 1g of dodecyl dimethyl benzyl ammonium chloride bactericide, 11g of clay stabilizer, 0.9g of cross-linking agent borax and 1g of breaker ammonium persulfate, 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 the embodiment 1.
The obtained fracturing fluid can be completely broken through 2h at 60 ℃.
Performance detection
The formula of the guanidine gum fracturing fluid meets the evaluation standard of the fracturing fluid: under the condition that the construction condition is met, the viscosity is not lower than 50 mPa.s, the antibacterial performance of the base fluid reaches at least 72 hours, the viscosity reduction requirement of the base fluid is not more than 20%, and other sand carrying capacity and core damage detection indexes are shown in tables 1-5 respectively.
1. The temperature resistance of the fracturing fluid containing 0.2%, 0.25% and 0.3% hydroxypropyl guar in each of the examples and comparative examples and the antibacterial performance index of the corresponding base fluid are shown in tables 1 to 3, respectively.
TABLE 1 thermal resistance and antimicrobial Performance index of base fluids for fracturing fluids containing 0.2% hydroxypropyl guar
TABLE 2 thermal resistance and antibacterial Performance index of base fluid of fracturing fluid containing 0.25% hydroxypropyl guanidine gum
TABLE 3 thermal resistance and base fluid antibacterial performance index for fracturing fluids containing 0.3% hydroxypropyl guanidine gum
As shown in tables 1-3, the guanidine gum fracturing fluid provided by the invention has excellent temperature resistance and antibacterial performance of the corresponding base fluid, and is obviously superior to the fracturing fluid added with the conventional bactericide dodecyl dimethyl benzyl ammonium chloride in the comparative example.
2. Detecting sand carrying capacity of fracturing fluid
TABLE 4 fracturing fluid sand carrying Capacity
Remarks: the viscosity of the fracturing fluid is lower than the industry standard of 50 mPa.s at 80 ℃ and does not reach the standard, so that sand carrying capacity detection is not carried out.
As can be seen from table 4, namely, examples 1, 2, and 3 (guanidine gum of 0.2% hydroxypropyl guanidine gum) had about 7 times the sand carrying capacity of comparative example 1 and about 1.8 times the sand carrying capacity of comparative example 3 at normal temperature of 25 ℃; examples 1, 2, 3 were about 2.5 times as much as comparative example 1, comparable to comparative example 3, at 42 ℃;
examples 5, 6, and 7 (guanidine gum of 0.3% hydroxypropyl guanidine gum) had about 7 times greater sand carrying capacity than comparative example 3 at normal temperature of 25 ℃; about 3 times that of comparative example 3 at 42 ℃; about 1.8 times that of comparative example 3 at 80 ℃.
Examples 1, 2, and 3 (guanidine gum of 0.2% hydroxypropyl guanidine gum) had about 5 times greater sand carrying capacity than comparative example 4 at normal temperature of 25 ℃; examples 1, 2, 3 were about 2 times that of comparative example 4 at 42 ℃.
From the above, the sand carrying capacity of the guanidine gum fracturing fluid provided by the invention is obviously better than that of the comparative example.
3. Core damage performance index for detecting fracturing fluid
Table 5 core damaging properties of fracturing fluids
From table 5, the fracturing fluid disclosed by the invention has the advantages of small damage degree to the rock core and more excellent performance through comparison of the damage to the rock core. Example 1 showed less damage to the core than comparative example 5 with a 1/3 reduction in the amount of hydroxypropyl guar used.
Claims (7)
1. A low-concentration self-assembled guanidine gum fracturing fluid is characterized in that: the material consists of the following raw materials in percentage by weight 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;
in the multi-effect auxiliary agent, the organic amine solvent is any one of tetramethyl-1, 3-propanediamine, N-dimethyl-1, 3-propanediamine or dimethylethanolamine;
in the multi-effect auxiliary agent, the mass ratio of the fly ash to the organic amine solvent is (2-3): 5, a step of; the mass ratio of the suspension to the glycoluril to the water is 100:1:0.5.
2. The low-concentration self-assembled guanidine gum fracturing fluid according to claim 1, wherein: the clay stabilizer comprises the following components in percentage by mass: the mixture of potassium chloride and polyquaternium of (1-4).
3. The low-concentration self-assembled guanidine gum fracturing fluid according to claim 2, wherein: the poly quaternary ammonium salt is any one of poly dimethyl diallyl ammonium chloride, poly trimethyl allyl ammonium chloride, poly 2-hydroxypropyl-1, 1-N-dimethyl ammonium chloride, poly quaternary ammonium salt-7, poly quaternary ammonium salt-32 and poly methacryloyloxyethyl trimethyl ammonium chloride.
4. The low-concentration self-assembled guanidine gum fracturing fluid according to claim 1, wherein: the cleanup additive is nonylphenol polyoxyethylene ether.
5. The low-concentration self-assembled guanidine gum fracturing fluid according to claim 1, wherein: the cross-linking agent is borax.
6. The low-concentration self-assembled guanidine gum fracturing fluid according to claim 1, wherein: the breaker is ammonium persulfate.
7. The method for preparing the low-concentration self-assembled guanidine gum fracturing fluid is characterized by comprising the following steps: the method comprises the following steps:
(1) Weighing raw materials according to 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, and preparing a base solution;
(2) And adding a cross-linking agent and a gel breaker into the base solution, and stirring and uniformly mixing to form gel, thus obtaining the low-concentration self-assembled guanidine gum fracturing fluid.
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