Guanidine gum fracturing fluid and application thereof

Abstract

The invention belongs to the technical field of fracturing fluids, and relates to a guanidine gum fracturing fluid and an application thereof. The invention provides a guanidine gum fracturing fluid which comprises an organic boron cross-linking agent and a base fluid, and the mass ratio of the organic boron cross-linking agent to the base fluid is (0.2-1): 100. The synthesized organic boron cross-linking agent is applied to a water-based fracturing fluid system with hydroxypropyl guar gum as a thickening agent, and the organic boron cross-linking agent has good temperature resistance and shear resistance. Meanwhile, field fracturing tests of multiple oil and gas wells are completed, and the use requirement of 120 DEG C formation temperature can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of fracturing fluids and relates to a guar gum fracturing fluid and an application thereof. Background Art

[0002] Organoboron crosslinkers are mainly inorganic boron compounds such as borax and boric acid, which react with polyhydroxy compounds, polyaldehydes, and sugar derivatives under certain conditions to generate boron-containing organic compounds. Currently, all organoboron crosslinkers on the market need to be synthesized under high temperature or high pressure, which has high requirements on production equipment and process, and there are certain risks in the production process.

[0003] The present application synthesizes an organic boron crosslinking agent at room temperature and pressure by controlling the dosage of boron compounds, polyhydroxy compounds, and alkalinity regulators. The organic boron crosslinking agent has the characteristics of delayed crosslinking, high temperature resistance, shear resistance, and automatic gel breaking. The synthesized organic boron crosslinking agent is applied to a water-based fracturing fluid system with hydroxypropyl guar gum as a thickener, and is directly added, diluted with water, or compounded when preparing the water-based fracturing fluid. The prepared water-based fracturing system overcomes the shortcomings of inorganic boron crosslinked fracturing fluid, such as too fast crosslinking, poor temperature resistance, and high friction resistance during construction. At the same time, it has the high temperature resistance and shear resistance of organic titanium and organic zirconium crosslinked gel, and improves its disadvantage of difficult gel breaking. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a guar gum fracturing fluid and its application, and an organic boron crosslinking agent synthesized from a boron compound, a polyhydroxy compound, and an alkalinity regulator at normal temperature and pressure is invented. The synthesized organic boron crosslinking agent is applied to a water-based fracturing fluid system with hydroxypropyl guar gum as a thickener, and the system has good temperature resistance and shear resistance. At the same time, field fracturing tests of multiple wells were completed in Yanchang Gas Field, Yanchang Oil Field and other places.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a guar fracturing fluid, comprising an organic boron cross-linking agent and a base fluid, wherein the mass ratio of the organic boron cross-linking agent to the base fluid is 0.2-1:100.

[0007] Preferably, the organic boron crosslinking agent comprises 10-18% of a boron compound and 18-30% of a polyhydroxy compound in terms of mass percentage.

[0008] Preferably, the organic boron cross-linking agent further comprises 0.7-4.7% of a basicity regulator in terms of mass percentage.

[0009] Preferably, in terms of mass percentage, the base fluid consists of 0.3-0.4% hydroxypropyl guar gum, 0.25-0.4% drainage aid, 0.25-0.4% clay stabilizer and 0.09-0.2% fracturing fungicide.

[0010] Preferably, the drainage aid is a fluorocarbon surfactant.

[0011] Preferably, the clay stabilizer is sodium succinate, polyetheroxyethylene alcohol or a small cation.

[0012] In a second aspect, a guar fracturing fluid is provided, wherein the guar fracturing fluid comprises an organic boron cross-linking agent and a base fluid.

[0013] The mass ratio of the organic boron crosslinking agent to the base liquid is 0.2-1:100;

[0014] In terms of mass percentage, the organic boron crosslinking agent includes 10-18% of a boron compound, 18-30% of a polyhydroxy compound, and 0.7-4.7% of a basicity regulator;

[0015] According to mass percentage, the base fluid consists of 0.3-0.4% hydroxypropyl guar gum, 0.25-0.4% drainage aid, 0.25-0.4% clay stabilizer and 0.09-0.2% fracturing fungicide.

[0016] Preferably, the guar fracturing fluid comprises an organic boron cross-linking agent and a base fluid.

[0017] The mass ratio of the organic boron crosslinking agent to the base liquid is 0.3:100;

[0018] In terms of mass percentage, the organic boron crosslinking agent includes 12% boron compound, 20% polyhydroxy compound and 1.7% alkalinity regulator;

[0019] According to mass percentage, the base fluid consists of 0.36% hydroxypropyl guar gum, 0.3% drainage aid, 0.3% clay stabilizer and 0.1% fracturing fungicide.

[0020] Preferably, the preparation method of the organic boron crosslinking agent is as follows:

[0021] At room temperature and pressure, weigh an appropriate amount of water, add 18-30% of polyhydroxy compound under stirring until completely dissolved, then add 10-18% of boron compound until completely dissolved, and finally add 0.7-4.7% of alkalinity regulator until completely dissolved;

[0022] The normal temperature is 10-30°C;

[0023] The normal pressure is 88-101 KPa.

[0024] In a third aspect, a fracturing fluid is provided, wherein the fracturing fluid comprises the guar gum fracturing fluid described in the present invention.

[0025] In a fourth aspect, there is provided a use of the guar gum fracturing fluid of the present invention in the preparation of a fracturing fluid.

[0026] Preferably, the guar fracturing fluid comprises an organic boron crosslinking agent and a base fluid, and the mass ratio of the organic boron crosslinking agent to the base fluid is 0.2-1:100;

[0027] In terms of mass percentage, the organic boron crosslinking agent is composed of 10-18% of a boron compound, 18-30% of a polyhydroxy compound and 0.7-4.7% of a basicity regulator;

[0028] According to mass percentage, the base fluid consists of 0.3-0.4% hydroxypropyl guar gum, 0.25-0.4% drainage aid, 0.25-0.4% clay stabilizer and 0.09-0.2% fracturing fungicide.

[0029] Preferably, the boron compound is a borate, the polyhydroxy compound is a polyhydroxy aldehyde, a polyhydroxy ketone and a polyhydroxy alcohol, the alkalinity regulator is an organic base and an inorganic base, and the fracturing fungicide is a non-oxidizing cationic surfactant and an aldehyde.

[0030] Preferably, the guar fracturing fluid comprises an organic boron cross-linking agent and a base fluid.

[0031] The mass ratio of the organic boron crosslinking agent to the base liquid is 0.3:100;

[0032] In terms of mass percentage, the organic boron crosslinking agent includes 12% boron compound, 20% polyhydroxy compound and 1.7% alkalinity regulator;

[0033] According to mass percentage, the base fluid consists of 0.36% hydroxypropyl guar gum, 0.3% drainage aid, 0.3% clay stabilizer and 0.1% fracturing fungicide.

[0034] The crosslinking mechanism of the organoboron crosslinking agent of the present invention is:

[0035] It should be noted that an organic complex borate crosslinking system is formed by borate and organic ligand. The organic ligand (LGD) is mainly a low molecular compound containing multiple hydroxyls, and its synthesis is carried out in two steps: the first step is the hydrolysis of borate to generate borate ions, and the second step is the reaction of borate ions with LCD containing multiple hydroxyls under certain conditions to generate colloidal particles containing multiple boron ions. Excess ligands are wrapped around the colloidal particles to shield the borate ions. The reaction product of borate and LCD is a suspension of fine colloidal particles dispersed in a solvent, and this substance is an organic boron crosslinking agent. The difference in organic ligands and synthesis conditions makes the organic boron complex have different properties.

[0036] The mechanism of action of the organoboron crosslinking agent of the present invention is speculated by the present applicant as follows: first, the organoboron complex undergoes multi-stage ionization, slowly generating borate ions B(OH)4 - ; Then the borate ion B(OH)4 - It reacts with the cis-ortho-hydroxyl groups on the molecular chains of plant gum polysaccharides to form a three-dimensional mesh gel with a structure like Figure 1 shown.

[0037] The applicant speculates that the delayed crosslinking mechanism of the organic boron crosslinking agent of the present invention is that the borate ions act to crosslink the organic boron crosslinking agent with the plant gum. Since the excess ligands are wrapped around the organic boron crosslinking agent, the borate ions are shielded, thereby delaying the crosslinking time with the polysaccharide molecules, thereby achieving the purpose of delaying crosslinking.

[0038] The heat and shear resistance mechanism of the organoboron crosslinking agent of the present invention is speculated by the applicant as follows:

[0039] The structure of the organic boron crosslinker contains a large number of borate ions. At each crosslinking point, multiple boron ions and the adjacent dihydroxyl groups on the polysaccharide molecular chain form complex bonds, which greatly improves the crosslinking strength and enhances the temperature resistance of the plant gel fracturing fluid. When the organic boron plant gel is heated and sheared, it will degrade and the crosslinking effect will be weakened. However, the continuous dissociation of a large number of borate ions in the structure of the organic boron crosslinker will replenish the crosslinking ions B(OH)4 required for crosslinking. - , so that the solution maintains a high viscosity, and the reaction continues until all the organic boron complexes are completely dissociated and there is no borate ion supplement. The organic boron cross-linking agent contains a large amount of borate ions and the characteristics of gradual dissociation improve the shear resistance of the organic boron plant gum fracturing fluid.

[0040] Compared with the prior art, the present invention has the following beneficial effects or advantages:

[0041] The invention uses boron compounds as raw materials and carries out complexation reaction with polyhydroxy compounds at room temperature and pressure to prepare an organic boron crosslinking agent for oil well fracturing. An organic boron crosslinking agent synthesized from boron compounds, polyhydroxy compounds and alkalinity regulators at room temperature and pressure is invented.

[0042] The present invention applies the synthesized organic boron crosslinking agent to a water-based fracturing fluid system with hydroxypropyl guar gum as a thickener, and carries out indoor evaluation. The results show that the organic boron crosslinking agent of the present invention has good heat resistance and shear resistance, and the guar gum fracturing fluid provided by the present invention has good heat resistance and shear resistance. At the same time, field fracturing tests of multiple wells were completed in Yanchang Gas Field, Yanchang Oil Field and other places. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1It is an organic boron cross-linked plant jelly structure;

[0044] Figure 2 The organic boron crosslinking agent prepared by the present invention is heated at 120°C for 170 seconds. -1 The rheological curve below;

[0045] Figure 3 To determine the fracturing construction curve of well 43010-7. DETAILED DESCRIPTION

[0046] In order to more clearly express the advantages of the present invention, the following specific examples are used to describe in detail, but the present invention is by no means limited thereto. The experimental methods used in the examples are conventional methods unless otherwise specified. The materials, reagents, etc. used in the examples can be obtained from commercial sources unless otherwise specified.

[0047] Example 1

[0048] This example provides an evaluation method for an organic boron crosslinking agent.

[0049] 1.1 Performance evaluation of organoboron crosslinking agent

[0050] The organic boron crosslinker is the core part of the water-based gel fracturing fluid and plays a decisive role in the viscosity of the gel fracturing fluid. The crosslinker and the thickener (hydroxypropyl guar gum) form a three-dimensional mesh gel, which becomes a viscoelastic fluid with greatly improved viscosity, giving it good seam-making and sand-carrying properties, and also eliminating many problems caused by high-temperature deep-well fracturing construction with linear gum. The advantages of the organic boron crosslinker are mainly that it can delay crosslinking, has low friction, is easy to break, and has good heat and shear resistance. It is currently the preferred fracturing fluid crosslinker for the on-site guar gum fracturing system. Delayed crosslinking time and heat and shear resistance are the main contents of its performance evaluation. The evaluation method is based on the Chinese petroleum and natural gas industry standard SY / T5107-2016 "Water-based fracturing fluid performance evaluation method".

[0051] 1.2 Heat resistance and shear resistance

[0052] During construction, the fracturing fluid will experience a wide range of shear and temperature changes. The performance of the fracturing fluid in the fracture depends on its chemical composition and the shear and temperature changes it has experienced from the initial mixing to its final position in the fracture. During the pumping process, the liquid will experience high-speed shear as it passes through the pipeline, wellbore and perforations. Once the liquid enters the fracture, its shear rate decreases, but the liquid temperature increases until it approaches the formation temperature. In this process, the fracturing fluid is affected by mechanical shear and temperature increase, and the cross-linked chains will break, causing the viscosity of the fracturing fluid to decrease and the sand carrying performance to deteriorate, which may lead to the failure of the fracturing construction. Therefore, the change of the apparent viscosity of the fracturing fluid with time at the formation temperature and the corresponding continuous shear rate is generally regarded as one of the important indicators for evaluating the performance of the fracturing fluid, also known as the temperature and shear resistance of the fracturing fluid. The experiment used the mark 40 high temperature and high pressure rheometer of the German HAAKE company to evaluate the fracturing fluid formulated with organic boron at 120°C and 170s -1 After 2 hours of shearing, whether the viscosity is still greater than 100mPa·s, that is, the temperature resistance and shear resistance.

[0053] 1.3 Delayed cross-linking time

[0054] Delayed crosslinking of fracturing fluid is an important chemical way for fracturing fluid to reduce pipeline friction, reduce the degradation of fracturing fluid by mechanical shear, and enhance its field operability. It is also one of the methods to improve the main performance of boron gel fracturing fluid. Organic boron crosslinking agent has adjustable delayed crosslinking characteristics. Under different reservoir characteristics and process conditions, it can adjust the gelation time, minimize pipeline friction, and reduce the pumping pressure on the ground. The experiment uses the vortex method formulated in the "Method for Evaluation of Water-Based Fracturing Fluid Performance" to determine its crosslinking time. Take the base fluid prepared with hydroxypropyl guar gum, drainage agent, clay stabilizer, and bactericide and pour it into a high-speed mixer. Rotate at a speed of about 1800r / min. After the vortex is formed and the bottom is reached, add the organic boron crosslinking agent. The crosslinking ratio is 100:0.2~1. Observe the crosslinking and thickening of the fracturing fluid, and use a stopwatch to record the time. The time when the vortex of the fracturing fluid is closed is the delayed crosslinking time. The crosslinking time is determined according to the requirements of the on-site fracturing construction, generally ranging from 20 seconds to 180 seconds.

[0055] 1.4 Fracturing fluid gel breaking

[0056] In order to reduce the damage of fracturing fluid to the formation, it is required that the fracturing fluid can be completely debonded in a short time after the construction is completed. Generally, debonding agents are added to reduce its viscosity, so that it can be quickly hydrated to avoid contamination and damage to the formation caused by fracturing construction. Ammonium persulfate was selected as a debonding agent in the experiment, and the debonding performance of the fracturing fluid system at the reservoir temperature of each block was evaluated indoors. The debonding performance is based on the standard that the viscosity of the debonding fluid is less than 5mPa·s within 120min.

[0057] Example 2

[0058] This embodiment provides the preparation of fracturing fluid

[0059] 0.36% hydroxypropyl guar gum, 0.3% drainage aid, 0.3% clay stabilizer and 0.1% fracturing fungicide are prepared into a base fluid. After stirring evenly, an organic boron crosslinker (composed of 12% boron compound, 20% polyhydroxy compound and 1.7% alkalinity regulator) is added at a mass ratio of 100:0.3, and stirred with a glass rod until a jelly that can be picked up is formed. The fracturing fluid jelly (i.e., guar gum fracturing fluid) is heated at 120°C and 170s -1 After 2 hours of shearing, the viscosity is still greater than 100 mPa·s.

[0060] Example 3

[0061] This example provides experimental test results

[0062] 3.1 Effect of boron compound dosage on crosslinking effect and heat resistance

[0063] When the reaction time is 30 min and the reaction temperature is 25°C, the effect of the amount of boron compound is shown in Table 1.

[0064] Table 1 Effect of boron compound dosage on crosslinking time and temperature resistance

[0065] Boron compound dosage / % 6 8 10 12 14 Cross-linking time / s 56 44 36 28 15 Temperature resistance / ℃ 64 72 81 91 85

[0066] As can be seen from Table 1, the optimal mass percentage of the boron compound is 12%. When the amount of the boron compound is small, the complex generated by the reaction of the boron compound with the polyhydroxy compound contains less borate ions, and only a small amount of boron ions on each cross-linking point form complex bonds with the cis-ortho-dihydroxyl groups on the hydroxypropyl guar gum molecular chain, which reduces the cross-linking strength and thus reduces the temperature resistance of the fracturing fluid; when the amount of borax is too high, a certain amount of uncomplexed borate ions exists in the product, which makes the cross-linking speed too fast, and even has the phenomenon of "over-cross-linking", and the gel is brittle and the viscosity is poor.

[0067] 3.2 Effect of polyol dosage on crosslinking effect and heat resistance

[0068] When the reaction time is 30 min and the reaction temperature is 25°C, the effect of the amount of polyhydroxy compound is shown in Table 2.

[0069] Table 2 Effect of polyol dosage on crosslinking effect and heat resistance

[0070] Polyhydroxy compound dosage / % 11 14 17 20 23 Cross-linking time / s 20 32 41 55 49 Temperature resistance / ℃ 60 68 79 88 83

[0071] It can be seen from Table 2 that when the amount of polyhydroxy compound is lower than , the boron compound is excessive, there are unreacted borate ions in the complex, the delay time is short, and the temperature resistance changes greatly; when the amount of polyhydroxy compound is higher than , the ligand is excessive, which may have a certain degree of hindrance to the complex reaction between the borate ion and the ligand, thereby reducing the temperature resistance. The optimal mass percentage of polyhydroxy compound is 20%.

[0072] 3.3 Effect of alkalinity regulator dosage on crosslinking effect and heat resistance

[0073] When the reaction time is 30 min and the reaction temperature is 25°C, the effect of the amount of alkalinity regulator is shown in Table 3.

[0074] Table 3 Effect of alkalinity regulator dosage on crosslinking effect and heat resistance

[0075]

[0076]

[0077] According to the cross-linking mechanism of boron ions, B(OH)4 - It is the real cross-linking group. The equilibrium reaction of boric acid is the controlling step of the cross-linking reaction, and its reaction equilibrium is:

[0078]

[0079] From the analysis of the organoboron crosslinking mechanism, it is known that the borate ion plays a crosslinking role. The ortho-cis hydroxyl groups on the molecular chain of plant polysaccharide and the organic ligands in the organoboron crosslinker will compete for the borate ion, and the affinity between the ligand and the borate ion depends on the pH value of the solution. The affinity increases with the increase of the pH value. The higher the pH value, the more stable the organoboron complex is and the less likely it is to dissociate. Therefore, the borate ion concentration in the solution can be controlled by adjusting the pH value of the solution, thereby controlling the crosslinking time. The mass percentage of the alkalinity regulator was finally determined to be 1.7%, see Table 3.

[0080] 3.4 Evaluation of guar gum fracturing fluid gel breaking

[0081] Experimental method: put the guar gum fracturing fluid into a sealed container, put it into a constant temperature water bath and heat it to a constant temperature, the constant temperature is the reservoir temperature, the guar gum fracturing fluid is broken at a constant temperature, and the supernatant liquid of the broken gel liquid is taken at different times, and its viscosity is measured with a capillary viscometer. The test results are shown in Table 4.

[0082] Table 4 Gel breaking effect at different reservoir temperatures

[0083] Temperature / ℃ Viscosity at 120min / mPa·s 45 3.9 70 2.7 90 2.2

[0084] It can be seen from Table 4 that at different reservoir temperatures, the viscosity of the guar gum fracturing fluid is less than 5 mPa·s within 120 min, and the fracturing performance is good.

[0085] The fracturing fluid formulation according to Example 2 was tested using a Mark 40 high temperature and high pressure rheometer from German company Haake at 120°C and 170s -1 The rheological curve under Figure 2 As shown by Figure 2 It can be seen that the organic boron crosslinking agent of this formula is 120℃, 170s -1 After shearing for 100 minutes, the apparent viscosity is greater than 100 mPa·s, and the heat and shear resistance are good.

[0086] 3.5 On-site trial

[0087] Using a 3-ton reactor from Fengyuan Petroleum Additives Company, production was carried out in the proportion of 12% boron compounds, 20% polyhydroxy compounds, and 1.7% alkalinity regulators, and a trial was conducted in the 1st oil layer of the Dingbian Oilfield Ding 43010-7 well.

[0088] Active water: clean water + 0.3% clay stabilizer (small cation) + 0.3% drainage agent (fluorocarbon surfactant).

[0089] Fracturing fluid ratio: clean water + 0.1% fracturing fungicide + 0.36% hydroxypropyl guar gum + 0.3% drainage aid (fluorocarbon surfactant) + 0.3% clay stabilizer (small cation).

[0090] Cross-linking ratio: 100:0.3.

[0091] Fracturing construction curve Figure 3 As shown by Figure 3 It can be seen that the pressure during the fracturing process is stable, the maximum sand concentration is 20%, and there is no obvious pressure fluctuation when the sand concentration increases, and the fracturing process is stable.

[0092] At present, all the organoboron crosslinkers on the market need to be synthesized and produced under high temperature or high pressure, which has high requirements on the production equipment and process, and there are certain dangers in the production process. Such as the risk of burning and scalding caused by high temperature, the risk of explosion caused by high pressure, etc. The present invention provides an organoboron synthesis process at normal temperature and pressure, and by studying the effects of the dosage of boron compounds, polyhydroxy compounds, and alkalinity regulators on the crosslinking performance, delayed crosslinking time, and temperature resistance of the formed crosslinked gel of the organoboron crosslinker, the ratio of 12% boron compounds, 20% polyhydroxy compounds, and 1.7% alkalinity regulators is finally determined. Nine batches of pilot production were carried out, and field trials were carried out in Yanchang Oilfield and Gas Field. The product quality is stable, can withstand a temperature of 120°C, and the delayed crosslinking time, gel breaking effect, rheological curve, and fracturing construction curve all meet the industry standards and the requirements for on-site use in Yanchang Oilfield, and can also be used in formations below 120°C in other oil production blocks.

[0093] As described above, the present invention can be well implemented. The above embodiments are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various changes and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the present invention.

Claims

1. A guar gum fracturing fluid, characterized in that: The guar fracturing fluid comprises an organic boron cross-linking agent and a base fluid. The mass ratio of the organic boron crosslinking agent to the base liquid is 0.2-1:100; In terms of mass percentage, the organic boron crosslinking agent includes 10-18% of a boron compound, 18-30% of a polyhydroxy compound, and 0.7-4.7% of a basicity regulator; According to mass percentage, the base fluid consists of 0.3-0.4% hydroxypropyl guar gum, 0.25-0.4% drainage aid, 0.25-0.4% clay stabilizer and 0.09-0.2% fracturing fungicide.

2. The guar gum fracturing fluid according to claim 1, characterized in that: The degassing aid is a fluorocarbon surfactant.

3. The guar gum fracturing fluid according to claim 1, characterized in that: The clay stabilizer is sodium succinate, polyetheroxyethylene alcohol or a small cation.

4. The guar gum fracturing fluid according to claim 1, characterized in that: The guar fracturing fluid comprises an organic boron cross-linking agent and a base fluid. The mass ratio of the organic boron crosslinking agent to the base liquid is 0.3:100; In terms of mass percentage, the organic boron crosslinking agent includes 12% boron compound, 20% polyhydroxy compound and 1.7% alkalinity regulator; According to mass percentage, the base fluid consists of 0.36% hydroxypropyl guar gum, 0.3% drainage aid, 0.3% clay stabilizer and 0.1% fracturing fungicide.

5. The guar gum fracturing fluid according to any one of claims 1 to 3, characterized in that: The preparation method of the organoboron crosslinking agent is as follows: At room temperature and pressure, weigh an appropriate amount of water, add 18-30% of polyhydroxy compound under stirring until completely dissolved, then add 10-18% of boron compound until completely dissolved, and finally add 0.7-4.7% of alkalinity regulator until completely dissolved; The normal temperature is 10-30°C; The normal pressure is 88-101 KPa.

6. A fracturing fluid, characterized in that: The fracturing fluid comprises the guar gum fracturing fluid according to any one of claims 1 to 4.

7. Use of the guar gum fracturing fluid according to any one of claims 1 to 4 in the preparation of fracturing fluid.

8. The use according to claim 7, characterized in that: The guar fracturing fluid comprises an organic boron cross-linking agent and a base fluid, wherein the mass ratio of the organic boron cross-linking agent to the base fluid is 0.2-1:100; In terms of mass percentage, the organic boron crosslinking agent is composed of 10-18% of a boron compound, 18-30% of a polyhydroxy compound and 0.7-4.7% of a basicity regulator; According to mass percentage, the base fluid consists of 0.3-0.4% hydroxypropyl guar gum, 0.25-0.4% drainage aid, 0.25-0.4% clay stabilizer and 0.09-0.2% fracturing fungicide.

9. The use according to claim 8, characterized in that: The guar fracturing fluid comprises an organic boron cross-linking agent and a base fluid. The mass ratio of the organic boron crosslinking agent to the base liquid is 0.3:100; In terms of mass percentage, the organic boron crosslinking agent includes 12% of a boron compound, 20% of a polyhydroxy compound and 1.7% of a basicity regulator; According to mass percentage, the base fluid consists of 0.36% hydroxypropyl guar gum, 0.3% drainage aid, 0.3% clay stabilizer and 0.1% fracturing fungicide.

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