Guanidine gum fracturing flow-back fluid, re-prepared fluid and treatment method and system of guanidine gum fracturing flow-back fluid and re-prepared fluid

Abstract

The invention discloses guanidine gum fracturing flow-back fluid, re-prepared fluid and a treatment method and system of the guanidine gum fracturing flow-back fluid and the re-prepared fluid. The treatment method of the flow-back fluid comprises the following steps: step 1, sequentially adding a flocculation gel breaker, a boron removal agent, a calcium and magnesium ion remover and a sulfate radical remover into the fracturing flow-back fluid under a stirring condition to obtain a mixed solution; and step 2, carrying out solid-liquid separation on the mixed solution, carrying out primary filtration on a liquid product obtained by separation, and adding boron removal resin to complete the treatment of the guanidine gum fracturing flow-back fluid. According to the treatment method of the guanidine gum fracturing flow-back fluid, through the specific adding sequence of chemical reagents, the influence of a calcium and magnesium ion remover on boron removal can be reduced while it is guaranteed that boron, calcium and magnesium ions and sulfate ions are effectively removed. The treated re-prepared liquid can meet the technical requirements for gelling performance, hanging time, rheological property and sand-carrying performance, is beneficial to recycling of water resources, is energy-saving and environment-friendly, and has certain economic benefits.

Description

Technical Field

[0001] The invention relates to a guar gum fracturing flowback fluid, a re-mixed fluid and a processing method and system thereof. Background Art

[0002] Most of the oil reservoirs in northern Shaanxi are low-permeability reservoirs, and the exploitation of its oil and gas wells is usually carried out by fracturing operations. Since the oil wells in the region are too scattered, the distance between the wells is large, and most of them are located between mountains, and the roads in the oil fields are rugged, it is expensive to lay a gathering and transportation pipeline network for recycling or use equipment for centralized treatment. If the fracturing return fluid of most oil and gas wells is not treated or treated poorly, it will aggravate the environmental pollution in the region if it is directly discharged. At the same time, water resources are scarce in northern Shaanxi, and the treatment and reuse of fracturing return fluid is also one of the technical problems that need to be solved urgently.

[0003] The basic composition of water-based fracturing fluid is clean water, hydroxypropyl guar gum, clay stabilizer, drainage aid, bactericide, etc. The residual fracturing fluid discharged after the operation is completed contains a large amount of toxic and harmful substances, which will pollute the environment and is the main source of pollution in oil and gas field water bodies. In addition, due to the different conditions of each well during fracturing construction, the formula of fracturing fluid will also be adjusted accordingly. The suppliers of the same fracturing fluid chemical materials are also different, the quality of different production batches is different, and the order of pumping liquid is also different, which makes the composition of the return fluid of each well different. The composition of the return fluid of the same well at different times is also different. If it is collected in a tank, the liquid composition in each tank will be different. These characteristics make fracturing return fluid difficult to handle, and it is difficult to have a unified standard method. At present, the existing domestic fracturing return fluid treatment methods mainly include flocculation sedimentation method, biological and biochemical method, advanced oxidation technology, and Fe / C micro-electrolysis combined process. Among them, biological and biochemical methods have better treatment effects on flowback fluid, but the biological strains used have high requirements for environmental conditions such as temperature and oxygen demand, which are not suitable for the crude environment of oil fields; the equipment cost of advanced oxidation technology and Fe / C micro-electrolysis combined process is high, the treatment cost is high, and the economic applicability is poor in the treatment process. Therefore, with the development of science and technology in recent years, flocculation sedimentation method has gradually become the main treatment method for fracturing flowback fluid in China.

[0004] In addition, there are currently two main destinations for fracturing flowback fluid after treatment:

[0005] (1) Fracturing fluid treatment and reuse technology can not only reduce the regional impact of water resource loss, but also save oil and gas companies' operating costs. It is the main development direction in the future, but the overall technology is not very mature at present;

[0006] (2) Reinjection of fracturing fluid after it has been treated to meet standards is currently widely used in major domestic oil and gas fields. Reinjection into the formation will not only damage the formation, disrupt the balance of groundwater recharge and discharge, affect the drinking water safety of local residents, but also cause a waste of resources, especially in areas with water shortages. Summary of the invention

[0007] In order to enrich the treatment methods of guar gum fracturing flowback fluid, the embodiments of the present invention provide a guar gum fracturing flowback fluid, a re-mixed fluid and a treatment method and system thereof. The method removes the ions and / or impurities that need to be removed from the flowback fluid by adopting a specific chemical reagent addition sequence and a physical and chemical combination treatment method, and increases the viscosity of the re-mixed fluid to improve the sand carrying capacity of the fracturing flowback fluid.

[0008] As one aspect of the present invention, it relates to a method for treating guar gum fracturing flowback fluid, the method comprising:

[0009] Step 1, under stirring, sequentially adding a flocculating breaker, a boron remover, a calcium and magnesium ion remover and a sulfate remover to the fracturing flowback fluid to obtain a mixed solution;

[0010] Step 2, separating the mixed liquid into solid and liquid, filtering the separated liquid product, and then adding a boron removal resin to complete the treatment of the guar gum fracturing flowback fluid.

[0011] In one or some possible embodiments, in step 1, the flocculating breaker is selected from one or more of polyaluminium chloride, aluminium sulfate, potassium aluminium sulfate, cationic polyacrylamide or polydimethyldiallylammonium chloride.

[0012] In one or some possible embodiments, in step 1, the boron removal agent is selected from one or more of polyvinyl alcohol, polypropylene alcohol or polyvinyl pyrrolidone.

[0013] In one or some possible embodiments, in step 1, the calcium and magnesium ion remover is an alkaline compound.

[0014] Furthermore, the alkaline compound is selected from one or more of potassium hydroxide, sodium hydroxide, sodium carbonate, potassium carbonate or sodium bicarbonate.

[0015] In one or some possible embodiments, in step 1, the sulfate remover is selected from one or more of manganous chloride, sodium bisulfite, sodium sulfite, sodium dithionite or sodium thiosulfate.

[0016] In one or some possible embodiments, in step 2, the filter material for the primary filtration is selected from acrylic or polyester fiber bundle filter material with a diameter of 20 to 50 mm.

[0017] In one or some possible embodiments, in step 2, the boron removal resin is Tusimer boron removal resin.

[0018] Specifically, the boron removal resin used in the present invention is an ion exchange resin, the skeleton of which is a copolymer of styrene and divinylbenzene, and its molecular structure contains functional groups such as polyhydroxylamines that can form complexes with boron. The polyhydroxyl groups can complex with boron to achieve the purpose of selectively adsorbing boron.

[0019] As another aspect of the present invention, it relates to a method for treating guar fracturing flowback fluid and then preparing the fluid, and the method includes the above-mentioned method for treating guar fracturing flowback fluid.

[0020] In one or some possible embodiments, it also includes: adding clean water and an appropriate amount of acid solution to the treated guar gum fracturing flowback fluid in sequence, adjusting the pH value of the flowback fluid to a set range, and obtaining a re-mixed fluid after the treatment of the guar gum fracturing flowback fluid.

[0021] As another aspect of the present invention, it relates to a processing system for the above-mentioned re-liquid preparation, the processing system comprising: a reaction device, a separation device, a filtering device and a clean water tank;

[0022] The guar gum fracturing flowback fluid passes through the reaction device, the separation device, the filtering device and the clean water tank in sequence;

[0023] The reaction device is used to mix the guar gum fracturing flowback fluid, the flocculating breaker, the boron removal agent, the calcium and magnesium ion remover and the sulfate remover;

[0024] The separation device is used to separate the mixed liquid into solid and liquid to obtain the liquid product;

[0025] The filtering device passes through the fiber bundle filter column and the boron removal filter tank in sequence according to the flow order of the backflow liquid; the fiber bundle filter column is used to remove suspended matter in the water; the boron removal resin filter tank is used to remove boron in the water;

[0026] The clean water tank is used to store clean water.

[0027] As another aspect of the present invention, it relates to a re-formulated fluid after the treatment of guar gum fracturing flowback fluid, and the re-formulated fluid is prepared using the above-mentioned treatment method.

[0028] In one or some possible embodiments, the pH value of the guar fracturing flowback fluid is 5.0-7.5, the boron content does not exceed 3 mg / L, the turbidity does not exceed 200 NTU, and the persulfate content does not exceed 10 mg / L.

[0029] Based on the above technical solution, the beneficial effects of the present invention compared with the prior art are as follows:

[0030] The treatment method of the guar gum fracturing flowback fluid of the present invention adopts gel breaking, physical combined with chemical method to remove boron in water, chemical method to reduce calcium and magnesium ions in water, and the method of removing persulfate in water, through the specific addition order of chemical reagents, can reduce the influence of calcium and magnesium ion remover on boron removal while ensuring the effective removal of boron, calcium and magnesium ions and sulfate ions. In addition, the treatment method of the present invention is not only applicable to guar gum fracturing flowback fluid, but also applicable to the flowback fluid of all fracturing operations in onshore oil fields, and has certain universality.

[0031] The re-mixed liquid after the guar gum fracturing flowback fluid is treated has a pH value of 5.0-7.5, a boron content of no more than 3 mg / L, a turbidity of no more than 200 NTU, and a persulfate content of no more than 10 mg / L. The water quality can meet the technical requirements of the re-mixed liquid on gelling performance, hanging time, rheological properties and sand carrying performance, is conducive to the recycling of water resources, energy conservation and environmental protection, and has certain economic benefits.

[0032] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a process flow chart of a treatment system for re-dispensing guar gum fracturing flowback fluid after treatment according to Example 2 of the present invention;

[0034] In the figure: a, guar gum fracturing flowback fluid; b, flocculating degumming agent; c, boron removal agent; d, calcium and magnesium ion removal agent; e, sulfate removal agent; f, acid solution; 1, reaction device; 2, plate and frame filter press; 3, filtering device; 31, fiber bundle filter column; 32, boron removal resin filter tank; 4, clean water tank. DETAILED DESCRIPTION

[0035] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0036] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0037] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which the invention belongs. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0038] In the description of the present invention, it should be noted that the terms "include", "including", "have", "contain" and the like are open terms, meaning including but not limited to.

[0039] The present invention is further described below in conjunction with specific embodiments, and the protection scope of the present invention is not limited by the following embodiments. The sources of materials mainly involved in the embodiments are all conventional commercial products.

[0040] Embodiment 1

[0041] This embodiment provides a method for treating guar gum fracturing flowback fluid a, comprising the following steps:

[0042] Step 1, under stirring, sequentially adding a flocculating breaker b, a boron removal agent c, a calcium and magnesium ion removal agent d and a sulfate removal agent e to the guar gum fracturing flowback fluid a to obtain a mixed solution;

[0043] Step 2, separating the mixed liquid into solid and liquid, filtering the separated liquid product, and then adding a boron removal resin to complete the treatment of the guar gum fracturing flowback fluid a.

[0044] The flocculating and degumming agent b is selected from one or more of polyaluminium chloride, aluminium sulfate, potassium aluminium sulfate, cationic polyacrylamide or polydimethyldiallylammonium chloride.

[0045] In the embodiment of the present invention, the flocculating breaker b can be selected from polyaluminium chloride, aluminium sulfate, a mixture of polyaluminium chloride or potassium aluminium sulfate, etc.

[0046] The boron removal agent c is selected from one or more of polyvinyl alcohol, polypropylene alcohol or polyvinyl pyrrolidone.

[0047] In the embodiment of the present invention, the boron removal agent c may be polyvinyl alcohol, polypropylene alcohol, a mixture of polyvinyl alcohol and polyvinyl pyrrolidone, etc.

[0048] The calcium and magnesium ion remover d is an alkaline compound, and the alkaline compound is selected from one or more of potassium hydroxide, sodium hydroxide, sodium carbonate, potassium carbonate or sodium bicarbonate.

[0049] In the embodiment of the present invention, the calcium and magnesium ion remover d may be sodium hydroxide, sodium carbonate, or a mixture of potassium hydroxide and sodium bicarbonate.

[0050] The sulfate remover e is selected from one or more of manganous chloride, sodium bisulfite, sodium sulfite, sodium dithionite or sodium thiosulfate.

[0051] In the embodiment of the present invention, the sulfate remover e can be industrial-grade manganous chloride produced by Lianyungang Wantai Technology Co., Ltd., can be sodium sulfite, or can be a mixture of sodium bisulfite, sodium dithionite and sodium thiosulfate.

[0052] The filter material for the primary filtration is selected from Henan Zhongmiao Environmental Protection Technology Co., Ltd., and is an acrylic or polyester fiber bundle material with a diameter of 20 to 50 mm.

[0053] In the embodiment of the present invention, the filter material may be an acrylic fiber bundle material with a diameter of 20 mm, 30 mm, 40 mm or 50 mm, or a polyester fiber bundle material.

[0054] The boron removal resin is Tusimer boron removal resin.

[0055] In a specific embodiment, the boron removal resin may be Tusimer boron removal resin produced by Xiaogan Kehaisi Environmental Protection Engineering Co., Ltd.

[0056] Embodiment 2

[0057] Refer to the attached Figure 1 The embodiment of the present invention provides a treatment system for re-dispensing guar gum fracturing flowback fluid after treatment, the treatment system comprising: a reaction device 1, a separation device 2, a filtering device 3 and a clean water tank 4;

[0058] The guar gum fracturing flowback fluid a passes through the reaction device 1, the separation device 2, the filtering device 3 and the clean water tank 4 in sequence;

[0059] The reaction device 1 is used to mix the guar gum fracturing flowback fluid a, the flocculating breaker b, the boron removal agent c, the calcium and magnesium ion removal agent d and the sulfate removal agent e;

[0060] In a specific embodiment, the reaction device 1 is provided with a stirrer.

[0061] The separation device 2 is used to separate the mixed liquid into solid and liquid to obtain the liquid product;

[0062] The separation device 2 is a plate and frame filter press.

[0063] In a specific embodiment, after the reaction liquid flowing out of the reaction device 1 enters the separation device 2, waste residue and liquid product are obtained; the liquid product is subjected to primary filtration, and the waste residue is subjected to harmless treatment.

[0064] In order to further remove impurities in water, the filtering device 3 is also included in the embodiment of the present invention.

[0065] The filtering device 3 passes through the fiber bundle filter column 31 and the boron removal filter tank 32 in sequence according to the flow order of the guar fracturing flowback fluid a; the fiber bundle filter column 31 is used to remove fine suspended matter in the water; the boron removal resin filter tank 32 is used to remove the remaining boron in the water.

[0066] The clean water tank 4 is used to store clean water.

[0067] Embodiment 3

[0068] Refer to the attached Figure 1 Based on the same inventive concept, an embodiment of the present invention provides a method for treating guar gum fracturing flowback fluid a and then preparing the fluid, the method includes the method for treating the flowback fluid of embodiment one, and adopts the treatment system of embodiment two.

[0069] In an embodiment of the present invention, it also includes: adding clean water and an appropriate amount of acid solution to the treated guar gum fracturing flowback fluid a in sequence, adjusting the pH value of the guar gum fracturing flowback fluid a to a set range, and obtaining the re-mixed fluid of the treated guar gum fracturing flowback fluid a.

[0070] In a specific embodiment, taking the guar gum fracturing flowback fluid a of the Su 53-76-20H well in the Sugeli gas field in Changqing as an example, the method for treating the guar gum fracturing flowback fluid a and then preparing the fluid comprises the following steps:

[0071] 1m 3The guar fracturing flowback fluid of Su 53-76-20H well in Changqing Sugeli gas field was pumped into the reaction device, the agitator was started, 5kg of polyaluminium chloride was added, stirred for 10 minutes, and then 0.6kg of polyvinyl alcohol (5% aqueous solution) was added. Under stirring conditions, 2kg of sodium carbonate was added, and finally 0.2kg of manganous chloride (20% aqueous solution) was added. After stirring and mixing, it was pumped into the plate and frame filter press for solid-liquid separation. The separated clean water was filtered at the first level (the filter material was acrylic fiber bundle filter material with a diameter of 30mm), and then entered the boron removal resin Tusimer filter tank, entered the clean water tank, added an appropriate amount of hydrochloric acid, adjusted the pH to about 7, and completed the re-liquid treatment process. The water quality indicators after treatment are shown in Table 2.

[0072] Table 2 Water quality indicators of re-mixed liquid

[0073] project Water quality index before treatment Water quality indicators after treatment Removal rate / % pH 6.0 7.2 —— Boron (mg / L) 12.3 1.0 91.9 Calcium and magnesium ions (mg / L) 230 35.6 84.5 Turbidity (NTU) 596 10 98.3 Persulfate (mg / L) 16.9 0 100

[0074] The experimental results show that in the water quality test of the re-mixed liquid after the pressure return liquid treatment of the present invention, the boron removal rate is 91.9%, and other indicators such as calcium and magnesium ions can also meet the requirements of the re-mixed liquid.

[0075] Embodiment 4

[0076] See attached Figure 1 Based on the same inventive concept, an embodiment of the present invention provides a method for treating guar gum fracturing flowback fluid and then preparing the fluid, the method includes the method for treating the flowback fluid of embodiment one, and adopts the treatment system of embodiment two.

[0077] In an embodiment of the present invention, the method further includes: adding clean water and an appropriate amount of acid solution to the treated guar fracturing flowback fluid in sequence, adjusting the pH value of the flowback fluid to a set range, and obtaining a re-mixed fluid after the treatment of the guar fracturing flowback fluid.

[0078] In a specific embodiment, taking the guar gum fracturing flowback fluid of Su 11-27-34 well in the Changqing Sugeli gas field as an example, the method for treating the guar gum fracturing flowback fluid and then preparing the fluid comprises the following steps:

[0079] 1m 3 The fracturing flowback fluid was pumped into the reaction device, the agitator was started, 5kg of aluminum sulfate was added, stirred for 10 minutes, and then 0.8kg of polyvinyl alcohol (5% aqueous solution) was added, 3kg of sodium hydroxide was added under stirring, and finally 0.3kg of sodium sulfite (20% aqueous solution) was added. After stirring evenly, it was pumped into the plate and frame filter press for solid-liquid separation. The separated clean water was filtered at the first level (the filter material was selected from polyester fiber bundles with a diameter of 50mm), and then entered the boron removal resin Tusimer filter tank, entered the clean water tank, added an appropriate amount of hydrochloric acid, adjusted the pH to about 7, and completed the re-liquid treatment process. The water quality indicators after treatment are shown in Table 3.

[0080] Table 3 Water quality index of re-mixed liquid

[0081] project Water quality before treatment Water quality after treatment Removal rate (%) pH 6 7.5 -- Boron (mg / L) 13.5 0.35 97.4 Calcium and magnesium ions (mg / L) 365 25.3 93.1 Turbidity (NTU) 725 10 98.6 Persulfate (mg / L) 201 0 100

[0082] The experimental results show that in the water quality test of the re-mixed liquid after the pressure return liquid treatment of the present invention, the boron removal rate is 97.4%, and other indicators such as calcium and magnesium ions can also meet the requirements of the re-mixed liquid.

[0083] Taking Example 4 as an example, the prior art with patent number CN112794501A and invention name "A method for removing boron ions in fracturing flowback fluid" is selected as a comparative example of Example 4 of the present invention. From the final removal rate of impurities: the boron removal rate of the comparative example is as high as 88%, while the boron removal rate of Example 4 of the present invention is as high as 97.4%; in addition, in the embodiments of the present invention, calcium and magnesium ions, suspended solids sedimentation and persulfate all achieve a better removal effect.

[0084] Based on this, the inventor judged that the reason why the removal rate of each impurity in the present invention can achieve such a better technical effect is the combined effect of the plate and frame filter press, the primary fiber bundle filter column and the separate treatment of various impurities. In the process of treating guar gum fracturing flowback fluid, the inventor fully considered the treatment of impurities and various fine solid suspended matter, and through the technical means of physical and chemical combination, the re-dispensing liquid can be recycled, and the harmless treatment of waste residues is also considered in the present invention. The entire treatment process can obtain better economic benefits and is green and environmentally friendly. It can be seen from this that: the treatment method of guar gum fracturing flowback fluid of the present invention can make the water quality of the re-dispensing liquid meet the technical requirements of the re-dispensing liquid for gelling performance, hanging time, rheological properties and sand carrying performance.

[0085] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0086] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0087] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A method for treating guar gum fracturing flowback fluid, characterized in that: The method comprises: Step 1, under stirring, sequentially adding a flocculating breaker, a boron remover, a calcium and magnesium ion remover and a sulfate remover to the fracturing flowback fluid to obtain a mixed solution; Step 2, separating the mixed liquid into solid and liquid, filtering the separated liquid product, and then adding a boron removal resin to complete the treatment of the guar gum fracturing flowback fluid.

2. The method for treating guar gum fracturing flowback fluid according to claim 1, characterized in that: In step 1, the flocculating and degumming agent is selected from one or more of polyaluminium chloride, aluminium sulfate, potassium aluminium sulfate, cationic polyacrylamide or polydimethyldiallylammonium chloride.

3. The method for treating guar gum fracturing flowback fluid according to claim 1, characterized in that: In step 1, the boron removal agent is selected from one or more of polyvinyl alcohol, polypropylene alcohol or polyvinyl pyrrolidone.

4. The method for treating guar gum fracturing flowback fluid according to claim 1, characterized in that: In step 1, the calcium and magnesium ion remover is an alkaline compound.

5. The method for treating guar gum fracturing flowback fluid according to claim 4, characterized in that: The alkaline compound is selected from one or more of potassium hydroxide, sodium hydroxide, sodium carbonate, potassium carbonate or sodium bicarbonate.

6. The method for treating guar gum fracturing flowback fluid according to claim 1, characterized in that: In step 1, the sulfate remover is selected from one or more of manganous chloride, sodium bisulfite, sodium sulfite, sodium dithionite or sodium thiosulfate.

7. The method for treating guar gum fracturing flowback fluid according to claim 1, characterized in that: In step 2, the filter material for the primary filtration is selected from acrylic or polyester fiber bundle filter material with a diameter of 20 to 50 mm.

8. The method for treating guar gum fracturing flowback fluid according to claim 1, characterized in that: In step 2, the boron removal resin is Tusimer boron removal resin.

9. A method for treating guar gum fracturing flowback fluid and then preparing the fluid, characterized in that: The method comprises the method for treating guar fracturing flowback fluid as described in any one of claims 1 to 8.

10. The method for treating guar gum fracturing flowback fluid and then preparing the fluid according to claim 9, characterized in that: Also includes: Clean water and an appropriate amount of acid solution are sequentially added to the treated guar fracturing flowback fluid, and the pH value of the flowback fluid is adjusted to a set range to obtain the treated re-mixed fluid of the guar fracturing flowback fluid.

11. A system for treating guar gum fracturing flowback fluid and then preparing the fluid, characterized in that: The treatment system comprises: a reaction device, a separation device, a filtering device and a clean water tank; The guar gum fracturing flowback fluid passes through the reaction device, the separation device, the filtering device and the clean water tank in sequence; The reaction device is used to mix the guar gum fracturing flowback fluid, the flocculating breaker, the boron removal agent, the calcium and magnesium ion remover and the sulfate remover; The separation device is used to separate the mixed liquid into solid and liquid to obtain the liquid product; The filtering device passes through the fiber bundle filter column and the boron removal filter tank in sequence according to the flow order of the backflow liquid; the fiber bundle filter column is used to remove suspended matter in the water; the boron removal resin filter tank is used to remove boron in the water; The clean water tank is used to store clean water.

12. A re-mixed liquid after treatment of guar gum fracturing flowback fluid, characterized in that: The re-mixed liquid is obtained using the processing method as claimed in claim 9 or 10.

13. The re-mixing liquid of guar gum fracturing flowback fluid according to claim 12, characterized in that: The pH value of the guar fracturing flowback fluid is 5.0-7.5, the boron content does not exceed 3 mg / L, the turbidity does not exceed 200 NTU, and the persulfate does not exceed 10 mg / L.

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