Modified graphene oxide plug-breaking injection-enhancing agent and preparation method thereof

Abstract

The application discloses a modified graphene oxide plug-removing and injection-increasing agent, which comprises the following components in mass fraction: 40-60 parts of modified graphene oxide; 10-20 parts of solvent oil; 10-20 parts of organic acid; and 20-30 parts of amino acid; and discloses a preparation method of the modified graphene oxide plug-removing and injection-increasing agent. The application is suitable for the technical field of crude oil exploitation, and the modified two-dimensional sheet nanometer material has a large specific surface area and contains a large number of polar groups, can well penetrate into crude oil, can effectively prevent the connection of wax crystals into a net structure, can disperse and emulsify gum and asphaltene in a system, and can prevent the planar overlapping and stacking of gum and asphaltene, so that the purpose of removing the gum and asphaltene blockage is achieved; the solvent oil can strip the oil on the scale surface so that the acid cannot reach the scale surface, and the organic acid and the amino acid can dissolve and corrode the scale, so that the blockage is removed.

Description

Technical Field

[0001] The invention belongs to the technical field of crude oil extraction, and in particular relates to a modified graphene oxide plugging-removing and injection-increasing agent and a preparation method thereof. Background Art

[0002] In order to solve the problems of oil and water wells being blocked by the combined effects of oil colloids, asphaltene, wax and scale, the main methods currently used are acidizing, high-frequency electromagnetic field, and acidizing + high-frequency electromagnetic field.

[0003] Acidizing is a commonly used method for blockage removal and injection. It is a type of chemical blockage removal technology. Chemical blockage removal primarily involves injecting chemicals into the formation or at the location of scale buildup. For blockages caused by colloids, asphalt, and scale, acidizing requires the selection of different chemical treatment agents based on the type of damage. For example, a combination of dispersants and surfactants can be used to remove blockages caused by asphalt or paraffin. This inevitably increases the workload. Furthermore, acidizing corrosion is a persistent problem, hindering its application.

[0004] High-frequency electromagnetic fields are a commonly used physical deblocking technology. They utilize high-frequency electromagnetic fields to alter the molecular structure of water, both for scale prevention and removal. When water passes through a high-frequency electromagnetic field, its molecular structure undergoes a change. The originally linked, chain-like macromolecules break down into individual water molecules. The positive and negative ions of the salts in the water are surrounded by these individual water molecules, slowing their movement, reducing the number of effective collisions, and weakening their electrostatic attraction, preventing them from forming on heated pipe surfaces. This prevents scale buildup. Simultaneously, the increased dipole moment of the water molecules enhances their ability to attract the positive and negative salt ions (scale molecules), loosening the scale on the heated surface or pipe wall and making it easier to fall off, effectively removing scale. However, physical deblocking technologies have several drawbacks: They typically target a specific location within the oil or pipeline, preventing the blockage from re-forming. Furthermore, physical methods are not suitable for deblocking within oil reservoirs. Furthermore, when cleaning complex equipment, the force sometimes fails to reach all areas uniformly, resulting in "dead spots."

[0005] Acidification can be combined with high-frequency electromagnetic fields to combine chemical and physical plugging removal technologies, which has certain improvements. However, the physical and chemical plugging removal technology has the following shortcomings: poor effect on oil-containing scales and serious acidification corrosion problems.

[0006] Therefore, a need exists for a blocking system that can solve the problem of oil and water wells being blocked by the combined effects of oil colloids, asphaltene, wax and scale in formations, oil pipes, oil pipelines, pumps, and the like. Summary of the Invention

[0007] The purpose of the present invention is to overcome the defects of the prior art and provide a modified graphene oxide plugging removal and injection agent and a preparation method thereof.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] In a first aspect, a modified graphene oxide plugging removal and injection agent comprises the following components by mass fraction:

[0010] 40-60 parts of modified graphene oxide;

[0011] 10-20 parts of solvent oil;

[0012] 10-20 parts of organic acid;

[0013] 20 to 30 parts of amino acids.

[0014] Preferably, the modified graphene oxide is a modification system in which different functional molecules are grafted onto the surface of graphene oxide with anionic surfactant, cationic surfactant, and nonionic surfactant modification groups.

[0015] Preferably, the modified graphene oxide has a simplified structural formula:

[0016]

[0017] Preferably, the modified graphene oxide is anion-modified graphene oxide, and the modifier group is sulfonic acid.

[0018] Preferably, the anionic surfactant is a linear hydrocarbon sulfonic acid or an alkyl aromatic hydrocarbon sulfonic acid.

[0019] Preferably, the linear alkane in the linear hydrocarbon sulfonic acid is an alkyl group with a carbon chain length of 10-20.

[0020] Preferably, the alkane in the alkyl aromatic sulfonic acid is an alkyl group with a carbon chain length of 6 to 20.

[0021] Preferably, the modified graphene oxide is cation-modified graphene oxide, and the modified group is a tertiary amine.

[0022] Preferably, the cationic modifier is a tertiary amine with a carbon chain length of 10-32.

[0023] Preferably, the modified graphene oxide is graphene oxide modified with a polyether surfactant, and the modifying group is polyether.

[0024] Preferably, the polyether modified groups are active agents with different polymer heads and different ratios of ethylene oxide and propylene oxide.

[0025] Preferably, the solvent oil is an aromatic solvent oil with a boiling point greater than 40°C.

[0026] Preferably, the solvent oil is one of No. 100 aromatic solvent oil, No. 120 aromatic solvent oil, and No. 180 aromatic solvent oil.

[0027] Preferably, the organic acid is one or a mixture of organic acids such as acetic acid, propionic acid, butyric acid, malonic acid, and succinic acid.

[0028] Preferably, the amino acid is one or a mixture of glycine, glutamic acid, and aspartic acid.

[0029] In a second aspect, a method for preparing a modified graphene oxide plugging removal and injection agent comprises the following steps:

[0030] S1 prepares modified graphene oxide;

[0031] S2 prepares modified graphene plugging removal and injection agent.

[0032] Preferably, in step S1, preparing modified graphene oxide comprises:

[0033] S11: placing 8-12 parts of graphene oxide, 16-24 parts of alkylphenol polyether, and 8-12 parts of dodecyl sulfuric acid in a pressure reactor, stirring, and adding a catalyst to react;

[0034] S12 adds 30-50 parts of dodecyldimethyl tertiary amine and stirs evenly, then heats up to react for a period of time, then cools down to room temperature and adjusts the pH value to neutral to obtain modified graphene oxide.

[0035] Preferably, in step S11, the stirring time is 5-15 minutes.

[0036] Preferably, in step S11, the catalyst is a KOH aqueous solution with a mass fraction of 0.1%.

[0037] Preferably, in step S11, the reaction temperature is 80-90° C., the reaction pressure is less than 0.5 MPa, and the reaction time is 4-6 h.

[0038] Preferably, in step S12, the temperature is raised to 90-100° C. and the reaction time is 4-6 hours.

[0039] Preferably, in step S2, preparing the modified graphene plugging removal and injection agent comprises:

[0040] The modified graphene oxide, solvent oil, organic acid and amino acid are added into a temperature-controllable reactor and stirred evenly to obtain the modified graphene oxide plugging-removing and injection-increasing agent.

[0041] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0042] In the present invention, a multifunctional product is formed by compounding solvent oil, organic acid, amino acid and other components with modified graphene to solve the problem of oil scale blockage. Modified graphene oxide is modified through intercalation modification technology to prepare a multifunctional viscosity-reducing nanomaterial. The modified two-dimensional sheet nanomaterial has a large specific surface area and contains a large number of polar groups. It can penetrate into crude oil well, effectively preventing wax crystals from connecting into a network structure, and can also disperse and emulsify the colloid and asphalt in the system, preventing the planar overlapping and accumulation of colloid asphalt, thereby achieving the purpose of removing the colloid asphalt blockage; the solvent oil can strip the oil from the scale surface, exposing the scale surface that the acid cannot reach, and the organic acid and amino acid dissolve the scale, thereby removing the blockage. DETAILED DESCRIPTION

[0043] The following examples further illustrate the specific embodiments of the modified graphene oxide plugging removal and injection-increasing agent and its preparation method of the present invention. The modified graphene oxide plugging removal and injection-increasing agent and its preparation method of the present invention are not limited to the description of the following examples.

[0044] Example 1:

[0045] This example provides a specific implementation of a modified graphene oxide plugging removal and injection agent, which includes the following components by mass fraction:

[0046] 40 parts of modified graphene oxide;

[0047] 10 parts solvent oil;

[0048] 10 parts organic acid;

[0049] 20 parts amino acids.

[0050] Furthermore, the modified graphene oxide is a modification system in which different functional molecules are grafted onto the surface of graphene oxide with anionic surfactant, cationic surfactant, and nonionic surfactant modification groups.

[0051] Furthermore, the structural formula of the modified graphene oxide is:

[0052]

[0053] Furthermore, the modified graphene oxide is anion-modified graphene oxide, and the modifier group is sulfonic acid.

[0054] Furthermore, the anionic surfactant is a linear hydrocarbon sulfonic acid or an alkyl aromatic hydrocarbon sulfonic acid.

[0055] Furthermore, the linear alkane in the linear hydrocarbon sulfonic acid is an alkyl group with a carbon chain length of 10-20.

[0056] Furthermore, the alkane in the alkyl aromatic sulfonic acid is an alkyl group with a carbon chain length of 6 to 20.

[0057] Furthermore, the modified graphene oxide is cation-modified graphene oxide, and the modified group is a tertiary amine.

[0058] Furthermore, the cationic modifier is a tertiary amine with a carbon chain length of 10-32.

[0059] Furthermore, the modified graphene oxide is graphene oxide modified with a polyether active agent, and the modified group is polyether.

[0060] Furthermore, the polyether modified groups are active agents with different polymer heads and different ratios of ethylene oxide and propylene oxide.

[0061] Furthermore, the solvent oil is an aromatic solvent oil, and its boiling point is greater than 40°C.

[0062] Furthermore, the solvent oil is one of No. 100 aromatic solvent oil, No. 120 aromatic solvent oil, and No. 180 aromatic solvent oil.

[0063] Furthermore, the organic acid is one or a mixture of organic acids such as acetic acid, propionic acid, butyric acid, malonic acid, and succinic acid.

[0064] Furthermore, the amino acid is one or a mixture of glycine, glutamic acid, and aspartic acid.

[0065] Example 2:

[0066] This example provides a specific implementation of a modified graphene oxide plugging removal and injection agent, which includes the following components by mass fraction:

[0067] 50 parts of modified graphene oxide;

[0068] 15 parts solvent oil;

[0069] 15 parts organic acid;

[0070] 25 amino acids.

[0071] Example 3:

[0072] This example provides a specific implementation of a modified graphene oxide plugging removal and injection agent, which includes the following components by mass fraction:

[0073] 60 parts of modified graphene oxide;

[0074] 20 parts solvent oil;

[0075] 20 parts organic acid;

[0076] 30 servings of amino acids.

[0077] Example 4:

[0078] This embodiment provides a specific implementation method of a modified graphene oxide plugging removal and injection agent, which includes the following steps:

[0079] S1 prepares modified graphene oxide;

[0080] S2 prepares modified graphene plugging removal and injection agent.

[0081] Furthermore, in step S1, preparing modified graphene oxide includes:

[0082] S11: placing 8-12 parts of graphene oxide, 16-24 parts of alkylphenol polyether, and 8-12 parts of dodecyl sulfuric acid in a pressure reactor, stirring, and adding a catalyst to react;

[0083] S12 adds 30-50 parts of dodecyldimethyl tertiary amine and stirs evenly, then heats up to react for a period of time, then cools down to room temperature and adjusts the pH value to neutral to obtain modified graphene oxide.

[0084] Furthermore, in step S11, the stirring time is 5 minutes.

[0085] Furthermore, in step S11, the catalyst is a KOH aqueous solution with a mass fraction of 0.1%.

[0086] Furthermore, in step S11, the reaction temperature is 80° C., the reaction pressure is less than 0.5 MPa, and the reaction time is 4 h.

[0087] Furthermore, in step S12, the temperature is raised to 90° C. and the reaction time is 4 hours.

[0088] Furthermore, in step S2, a modified graphene plugging and injection agent is prepared, comprising:

[0089] The modified graphene oxide, solvent oil, organic acid and amino acid are added into a temperature-controllable reactor and stirred evenly to obtain the modified graphene oxide plugging-removing and injection-increasing agent.

[0090] Furthermore, graphene oxide is modified, and different functional molecules are grafted to modify graphene oxide. One of them is graphene oxide modified with a polyether surfactant, and the modifying group is polyether. The graphene sheets are introduced through the etherification reaction between the hydroxyl groups of the polyether and the hydroxyl groups on the graphene surface.

[0091] Furthermore, the nonionic modified group is a polyether modified group, and the polyether modified group is an active agent with different polymer heads and different ratios of ethylene oxide and propylene oxide.

[0092] Furthermore, the modification method is to form amphiphilic modified graphene oxide by grafting the -COOH and -OH functional groups of graphene oxide through interlayer or end group reactions.

[0093] Example 5:

[0094] This example provides a specific implementation method of a method for preparing a modified graphene oxide plugging removal and injection-increasing agent. The other steps are similar to those in Example 4. Furthermore, in step S11, the stirring time is 10 minutes.

[0095] Furthermore, in step S11, the reaction temperature is 85° C., the reaction pressure is less than 0.5 MPa, and the reaction time is 5 h.

[0096] Furthermore, in step S12, the temperature is raised to 95° C. and the reaction time is 5 hours.

[0097] Example 6:

[0098] This example provides a specific implementation method of a method for preparing a modified graphene oxide plugging removal and injection-increasing agent. The other steps are similar to those in Example 4. Furthermore, in step S11, the stirring time is 15 minutes.

[0099] Furthermore, in step S11, the reaction temperature is 90° C., the reaction pressure is less than 0.5 MPa, and the reaction time is 6 h.

[0100] Furthermore, in step S12, the temperature is raised to 100° C. and the reaction time is 6 hours.

[0101] Example 7:

[0102] 7.1 Preparation of modified graphene oxide:

[0103] According to the mass ratio of 1:2:1, industrial graphene oxide and phenylphenol polyether-10 were weighed respectively. Hexadecyldimethyl tertiary amine A total of 40 g was placed in a stainless steel pressure reactor and stirred for 5 min. A 0.1% mass fraction of KOH aqueous solution was added as a catalyst. The reaction temperature was controlled at 80-90 ° C and the pressure was maintained at 0.5 MPa. After 5 h, dodecyl sulfate was added. After 40 g of the reaction mixture was stirred evenly, the temperature was raised to 90-100 ° C. and the reaction was carried out for 4 hours. The temperature was lowered to room temperature and the pH value was adjusted to be neutral to obtain 80 g of modified graphene oxide.

[0104] 7.2 Preparation of modified graphene plugging and injection agent:

[0105] Take 40g of the synthetic product in 7.1, add 15g of No. 100 aromatic solvent oil, 15g of malonic acid, and 30g of glycine into a three-hole flask and stir evenly to obtain the product.

[0106] 7.3 Performance evaluation:

[0107] 1) Effect of reaction temperature on descaling efficiency

[0108] The modified graphene plugging removal and injection agent prepared in Example 7 was selected to examine the scale removal rate of the modified graphene plugging removal and injection agent (concentration, 5%) at a solid-to-liquid ratio of 20:1 on calcium carbonate scale soaked in asphaltene-containing crude oil at different temperatures and a dissolution time of 24 hours. The test results of the modified graphene plugging removal and injection agent of this example are shown in Table 1 below:

[0109] Table 1 Descaling effect of different samples of carbonate scale soaked in asphaltene crude oil at different temperatures

[0110]

[0111] It can be seen from the table that with the increase of reaction temperature, the removal efficiency increases. The higher the temperature, the higher the descaling rate. The modified graphene declogging and injection agent has a significantly better descaling rate than ordinary hydrochloric acid and physical high-frequency oscillation + ordinary hydrochloric acid.

[0112] 2) The effect of reaction time on the descaling ability of the descaling rod

[0113] The modified graphene plugging removal and injection agent prepared in Example 7 (concentration, 5%) was selected with a solid-to-liquid ratio of 20:1. Simulated scale was tested at 50°C for different dissolution times on carbonate scale soaked in waxy crude oil to investigate its efficiency in removing plugs. The test results of the modified graphene plugging removal and injection agent in this example are shown in Table 2 below:

[0114] Table 2 Comparison of the plugging removal rate of graphene modified plugging removal agent and ordinary hydrochloric acid soaked in waxy crude oil

[0115]

[0116] The experimental results show that the scale removal rates of modified graphene plugging removal and injection agent, ordinary hydrochloric acid, and physical high-frequency oscillation + ordinary hydrochloric acid increase with time, and the scale removal rate of physical high-frequency oscillation + ordinary hydrochloric acid is significantly better than that of ordinary hydrochloric acid; the scale removal rate of modified graphene plugging removal and injection agent is significantly better than that of ordinary hydrochloric acid and physical high-frequency oscillation + ordinary hydrochloric acid.

[0117] The descaling rate of the physical method + chemical method for the waxy crude oil is better than that for the asphalt crude oil, mainly because the asphalt is deformable and not easy to break.

[0118] Example 8:

[0119] 8.1 Preparation of modified graphene oxide:

[0120] Weigh industrial graphene oxide and alkylphenol polyether in a mass ratio of 1:2:1 respectively. Dodecyl sulfate A total of 40 g was placed in a stainless steel pressure reactor and stirred for 5 min. A 0.1% mass fraction of KOH aqueous solution was added as a catalyst. The reaction temperature was controlled at 80-90 ° C and the pressure was kept at <0.5 MPa. After 5 h, dodecyl dimethyl tertiary amine was added. After 40 g of the reaction mixture was stirred evenly, the temperature was raised to 90-100 ° C. and the reaction was carried out for 4 hours. The temperature was lowered to room temperature and the pH value was adjusted to be neutral to obtain 80 g of modified graphene oxide.

[0121] 8.2 Preparation of modified graphene plugging and injection agent:

[0122] Take 50g of the synthetic product in 8.1, add 20g of No. 100 aromatic solvent oil, 10g of malonic acid, and 20g of glycine into a three-hole flask and stir evenly to obtain the product.

[0123] 3. Performance evaluation:

[0124] 1) Effect of reaction temperature on descaling efficiency

[0125] The modified graphene plugging removal and injection agent prepared in Example 8 was selected and tested at different temperatures. The modified graphene plugging removal and injection agent (concentration, 5%) with a solid-to-liquid ratio of 20:1 was tested. The removal efficiency of calcium carbonate scale and wax blocks soaked in asphaltene-containing crude oil was evaluated over a 24-hour dissolution period. The test results for the modified graphene plugging removal and injection agent of this example are shown in Table 1 below:

[0126] Table 1 Descaling effect of different products at different temperatures on carbonate scale soaked in asphalt

[0127]

[0128] It can be seen from the table that with the increase of reaction temperature, the removal efficiency increases. The higher the temperature, the higher the descaling rate. The modified graphene declogging and injection agent has a significantly better descaling rate than ordinary hydrochloric acid and physical high-frequency oscillation + ordinary hydrochloric acid.

[0129] 2) The effect of reaction time on the descaling ability of the descaling rod

[0130] The modified graphene plugging removal and injection agent prepared in Example 8 (concentration, 5%) was selected with a solid-to-liquid ratio of 20:1. Simulated scale was tested at 50°C for different dissolution times on carbonate scale soaked in waxy crude oil to investigate its efficiency. The test results for the modified graphene plugging removal and injection agent in this example are shown in Table 2 below:

[0131] Table 2 Comparison of the plugging removal rate of graphene modified plugging removal agent and ordinary hydrochloric acid soaked in waxy crude oil

[0132]

[0133]

[0134] The experimental results show that the scale removal rates of modified graphene plugging removal and injection agent, ordinary hydrochloric acid, and physical high-frequency oscillation + ordinary hydrochloric acid increase with time, and the scale removal rate of physical high-frequency oscillation + ordinary hydrochloric acid is significantly better than that of ordinary hydrochloric acid; the scale removal rate of modified graphene plugging removal and injection agent is significantly better than that of ordinary hydrochloric acid and physical high-frequency oscillation + ordinary hydrochloric acid.

[0135] The descaling rate of the physical method + chemical method for the waxy crude oil is better than that for the asphalt crude oil, mainly because the asphalt is deformable and not easy to break.

[0136] Compared with the example, the formula has enhanced wax dissolving ability but poor descaling ability. To improve the ability of the product, just increase the content of the corresponding component.

[0137] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A modified graphene oxide plugging and injection agent, characterized in that: Calculated by mass fraction, it includes the following components: 40-60 parts of modified graphene oxide; 10-20 parts of solvent oil; 10-20 parts of organic acid; 20-30 parts of amino acids; The modified graphene oxide is a modified system in which different functional molecules are grafted onto the surface of graphene oxide with anionic surfactant, cationic surfactant, and nonionic surfactant modification groups; The modified graphene oxide structural formula is:

2. A modified graphene oxide plugging and injection agent according to claim 1, characterized in that: The modified graphene oxide is anion-modified graphene oxide, and the modified group is sulfonic acid.

3. The modified graphene oxide plugging and injection agent according to claim 1, characterized in that: The anionic surfactant is a linear hydrocarbon sulfonic acid or an alkyl aromatic hydrocarbon sulfonic acid.

4. A modified graphene oxide plugging and injection agent according to claim 3, characterized in that: The linear alkane in the linear hydrocarbon sulfonic acid is an alkyl group with a carbon chain length of 10 to 20.

5. The modified graphene oxide plugging and injection agent according to claim 3, characterized in that: The alkane in the alkyl aromatic sulfonic acid is an alkyl group with a carbon chain length of 6 to 20.

6. The modified graphene oxide plugging and injection agent according to claim 1, characterized in that: The modified graphene oxide is cation-modified graphene oxide, and the modified group is a tertiary amine.

7. A modified graphene oxide plugging removal and injection agent according to claim 6, characterized in that: The cationic modifier is a tertiary amine with a carbon chain length of 10-32.

8. The modified graphene oxide plugging and injection agent according to claim 1, characterized in that: The modified graphene oxide is graphene oxide modified with a polyether activator, and the modified group is polyether.

9. A modified graphene oxide plugging removal and injection agent according to claim 8, characterized in that: The polyether modified groups are active agents with different polymer heads and different ratios of ethylene oxide and propylene oxide.

10. The modified graphene oxide plugging removal and injection agent according to claim 1, characterized in that: The solvent oil is an aromatic solvent oil with a boiling point greater than 40°C.

11. The modified graphene oxide plugging-removing and injection-increasing agent according to claim 10, characterized in that: The solvent oil is one of No. 100 aromatic solvent oil, No. 120 aromatic solvent oil, and No. 180 aromatic solvent oil.

12. The modified graphene oxide plugging removal and injection agent according to claim 1, characterized in that: The organic acid is one of acetic acid, propionic acid, butyric acid, malonic acid and succinic acid, or a mixture of several of them.

13. The modified graphene oxide plugging removal and injection agent according to claim 1, characterized in that: The amino acid is one of glycine, glutamic acid and aspartic acid or a mixture of several of them.

14. A method for preparing a modified graphene oxide plugging-removing and injection-increasing agent, for preparing the modified graphene oxide plugging-removing and injection-increasing agent according to any one of claims 1 to 13, characterized in that: The following steps are involved: S1 prepares modified graphene oxide; S2 prepares modified graphene plugging removal and injection agent.

15. The method for preparing a modified graphene oxide plugging-removing and injection-increasing agent according to claim 14, wherein: In the step S1, preparing modified graphene oxide includes: S11: placing 8-12 parts of graphene oxide, 16-24 parts of alkylphenol polyether, and 8-12 parts of dodecyl sulfuric acid in a pressure reactor, stirring, and adding a catalyst to react; S12 adds 30-50 parts of dodecyldimethyl tertiary amine and stirs evenly, then heats up to react for a period of time, then cools down to room temperature and adjusts the pH value to neutral to obtain modified graphene oxide.

16. The method for preparing a modified graphene oxide plugging-removing and injection-increasing agent according to claim 15, wherein: In step S11, the stirring time is 5-15 minutes.

17. The method for preparing a modified graphene oxide plugging-removing and injection-increasing agent according to claim 16, wherein: In the step S11, the catalyst is a KOH aqueous solution with a mass fraction of 0.1%.

18. The method for preparing a modified graphene oxide plugging-removing and injection-increasing agent according to claim 15, wherein: In step S11, the reaction temperature is 80-90° C., the reaction pressure is less than 0.5 MPa, and the reaction time is 4-6 h.

19. The method for preparing a modified graphene oxide plugging-removing and injection-increasing agent according to claim 15, wherein: In step S12, the temperature is raised to 90-100° C., and the reaction time is 4-6 hours.

20. The method for preparing a modified graphene oxide plugging-removing and injection-increasing agent according to claim 14, wherein: In the step S2, preparing a modified graphene plugging removal and injection agent comprises: The modified graphene oxide, solvent oil, organic acid and amino acid are added into a temperature-controllable reactor and stirred evenly to obtain the modified graphene oxide plugging-removing and injection-increasing agent.

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