A modified drilling fluid lubricant based on edible mushroom waste and a preparation method and application thereof

Abstract

The present application relates to a kind of modified drilling fluid lubricant based on edible fungus waste and its preparation method and application, belong to the technical field of lubricant for drilling fluid.The preparation method of the lubricant includes the following steps: edible fungus waste powder is added to sodium hydroxide aqueous solution, extraction is carried out, then filtration is carried out, to obtain filtrate;The pH of the obtained filtrate is adjusted to 6-7, ethanol aqueous solution is added, stirring is carried out, then standing is carried out, the lower layer precipitate obtained by standing is centrifuged, washed and dried to obtain extract;The obtained extract is added to deionized water-acetone mixed solvent, stirs uniformly, adjusts pH to 9-10, adds acylation reagent, and carries out acylation reaction;Then continue to add quaternary ammonium reagent, and carry out quaternary ammonium reaction;After reaction is completed, aftertreatment is carried out, to obtain lubricant.The lubricant can be widely applied in water-based drilling fluid, meet the drilling demand of high temperature complex formation such as deep well, ultra-deep well etc.

Description

Technical Field

[0001] This invention relates to a modified drilling fluid lubricant based on edible fungi waste, its preparation method and application, belonging to the technical field of drilling fluid lubricants. Background Technology

[0002] During oil drilling, the high-speed rotation of the drill string generates friction with the wellbore and casing. Excessive frictional resistance not only reduces the drilling rate but also easily leads to keyway formation on the wellbore. To reduce this resistance, lubricants are often added on-site to improve the lubricity of the drilling fluid, thereby reducing frictional resistance.

[0003] Currently, commonly used lubricants include mineral oil, vegetable oil, polyether, and graphite. The disadvantages of existing lubricants are: (1) mineral oil / synthetic esters have poor biodegradability; (2) traditional polymer lubricants (such as polyether) have insufficient temperature resistance (usually <150℃); (3) solid lubricants such as graphite require large dosages and easily affect the rheological properties of drilling fluids. Therefore, as drilling develops towards deeper and higher temperatures, there is an urgent need to develop a new type of lubricant that is highly efficient in lubrication, has good temperature resistance, and is environmentally friendly.

[0004] Chinese patent document CN119505835A discloses a method for preparing a lubricant with a modified silicon carbide particle structure coated with resin material for drilling fluids. The method includes the following steps: adding pretreated nano-SiC particles, hydroxyethyl acrylate, dodecyl acrylate, and a silane coupling agent to a base oil; then adding a chain transfer agent; stirring; adding an initiator; and reacting. After the reaction is complete, the mixture is filtered, washed, and dried to obtain modified nano-SiC particles. The modified nano-SiC particles are then added to a fluorocarbon resin solution, heated, reacted, dried, and ground to obtain the final product. However, this lubricant uses nano-silicon carbide as the core material, resulting in high raw material costs. Furthermore, the introduction of fluorocarbon resin increases the preparation cost. Additionally, fluorocarbon resin has poor biodegradability and insufficient environmental performance, making it difficult to meet increasingly stringent environmental requirements.

[0005] In recent years, the industrial production of edible fungi has developed rapidly, generating a large amount of waste during harvesting and consumption each year. If not properly disposed of in a timely manner, this waste not only affects the growth of edible fungi but also pollutes the environment. Domestically, the utilization of edible fungi waste is mainly limited to cultivation substrates and feed, and a comprehensive, safe, and efficient utilization method for edible fungi waste has not yet been developed.

[0006] Therefore, it is of great significance to prepare a new type of drilling fluid lubricant that combines temperature resistance, environmental friendliness, and high-efficiency lubrication properties using edible fungi waste as raw material. Summary of the Invention

[0007] To address the shortcomings of existing technologies, particularly the deficiencies of current synthetic drilling fluid lubricants such as insufficient temperature resistance, complex preparation processes, high costs, and poor environmental friendliness, this invention provides a modified drilling fluid lubricant based on edible fungi waste, its preparation method, and its application. This invention uses inexpensive and renewable edible fungi waste as raw material and employs a bifunctional modification process to prepare a novel drilling fluid lubricant with excellent temperature resistance, good lubrication performance, environmental friendliness, and low cost.

[0008] The technical solution of the present invention is as follows: A method for preparing a modified drilling fluid lubricant based on edible fungi waste includes the following steps: (1) Add the edible fungus waste powder to an aqueous sodium hydroxide solution for extraction, then filter to obtain the filtrate; adjust the pH of the obtained filtrate to 6-7, add an aqueous ethanol solution, stir and let stand, centrifuge, wash and dry the lower precipitate obtained after standing to obtain the extract; (2) Add the extract obtained in step (1) to a deionized water-acetone mixed solvent, stir evenly, adjust the pH to 9-10, add acylation reagent, and carry out acylation reaction; then add quaternization reagent to carry out quaternization reaction; after the reaction is completed, after post-processing, a modified drilling fluid lubricant based on edible fungus waste is obtained.

[0009] According to a preferred embodiment of the present invention, the edible fungus waste powder in step (1) is obtained by washing, drying and crushing edible fungus waste; the washing is done with deionized water; the drying is done at 60-70°C to constant weight; the particle size of the edible fungus waste powder is 60-80 mesh; the edible fungus waste includes, but is not limited to, the roots or stems of shiitake mushrooms, oyster mushrooms, king oyster mushrooms, tea tree mushrooms, straw mushrooms and enoki mushrooms.

[0010] According to a preferred embodiment of the present invention, the mass fraction of the sodium hydroxide aqueous solution in step (1) is 2-4%; the volume ratio of the sodium hydroxide aqueous solution to the mass of the edible fungus waste powder is 5-20 mL: 1 g.

[0011] According to a preferred embodiment of the present invention, the extraction temperature in step (1) is 75-85°C, and the extraction time is 2-4 hours.

[0012] According to a preferred embodiment of the present invention, in step (1), the pH of the filtrate is adjusted to 6-7 using an aqueous hydrochloric acid solution with a mass fraction of 5-15%.

[0013] According to a preferred embodiment of the present invention, the volume percentage of ethanol in the aqueous ethanol solution in step (1) is 90-95%; the volume ratio of the aqueous ethanol solution to the mass of the edible fungus waste powder is 20-40 mL: 1 g.

[0014] According to a preferred embodiment of the present invention, the washing in step (1) is performed by washing with anhydrous ethanol and acetone 2-3 times each; the drying is performed by vacuum drying at 60-70°C to constant weight.

[0015] According to a preferred embodiment of the present invention, the volume ratio of acetone to deionized water in the deionized water-acetone mixed solvent in step (2) is 3:3-7; and the volume ratio of the deionized water-acetone mixed solvent to the mass ratio of the extract is 10-30 mL:1 g.

[0016] According to a preferred embodiment of the present invention, in step (2), the pH is adjusted to 9-10 using a sodium hydroxide aqueous solution with a mass fraction of 10-20%.

[0017] According to a preferred embodiment of the present invention, the acylation reagent in step (2) is benzoic anhydride or benzoyl chloride, and the mass ratio of the acylation reagent to the extract is 0.3-0.5:1, more preferably 0.4:1; the acylation reagent is added to the system dropwise at a rate of 1-2 drops / s; when the acylation reagent is benzoic anhydride, it is added to the system dropwise in the form of benzoic anhydride acetone solution, and the concentration of the benzoic anhydride acetone solution is 0.3-0.5 g / mL.

[0018] According to a preferred embodiment of the present invention, the temperature of the acylation reaction in step (2) is 55-65°C, more preferably 60°C, and the time of the acylation reaction is 4-6 hours, more preferably 5 hours.

[0019] According to a preferred embodiment of the present invention, the quaternizing agent in step (2) is choline chloride or glycidyltrimethylammonium chloride, and the mass ratio of the quaternizing agent to the extract is 0.6-1:1, more preferably 0.8:1.

[0020] According to a preferred embodiment of the present invention, the temperature of the quaternization reaction in step (2) is 55-65°C, more preferably 60°C, and the time of the quaternization reaction is 4-6 hours, more preferably 5 hours.

[0021] According to a preferred embodiment of the present invention, the post-processing step in step (2) is as follows: the reaction solution obtained by the quaternization reaction is naturally cooled to room temperature, the pH is adjusted to neutral using a hydrochloric acid aqueous solution with a mass fraction of 5-10%, then filtered, the precipitate obtained by filtration is washed 2-4 times with anhydrous ethanol, then dried at 55-65℃ for 20-30h, and then pulverized to obtain a modified drilling fluid lubricant based on edible fungi waste.

[0022] The present invention also provides a modified drilling fluid lubricant based on edible fungi waste, which is prepared by the above preparation method.

[0023] According to the present invention, the above-mentioned modified drilling fluid lubricant based on edible fungus waste is used in water-based drilling fluids.

[0024] In this invention, room temperature has a commonly known meaning, referring to 25±5℃.

[0025] The technical features and beneficial effects of this invention are as follows: 1. Significantly improved high-temperature stability: This invention constructs a rigid, heat-resistant skeleton through acylation reaction, combined with the ionic stabilizing effect of quaternary ammonium salt groups, so that the viscosity retention rate of the lubricant after hot rolling aging at 180℃ is as high as 71.9%, and the lubrication coefficient reduction rate is still ≥90%, resulting in better high-temperature stability and thus ensuring the integrity of the lubricating film.

[0026] 2. High lubrication efficiency and low dosage: The lubricant of this invention contains phenyl and quaternary ammonium salt groups. Through the synergistic effect of polysaccharide structure and phenyl and quaternary ammonium salt groups, the lubricant can effectively spread and form a film with a very low dosage (0.5%). Experiments have shown that the lubrication coefficient reduction rate before and after aging is as high as 95.7% and 90.9%, respectively, which is better than traditional lubricants that require 1%-3% dosage.

[0027] 3. Environmentally friendly and low-cost: The raw materials used in this invention are derived from edible fungi waste, with a biodegradability rate of >85%, which meets the green requirements of the "Technical Specification for Drilling Fluid Waste Treatment" (SY / T5623-2023); the raw material cost is low, and the preparation process does not require expensive reagents and equipment, showing significant potential for large-scale application.

[0028] 4. The preparation process is green and simple: The present invention adopts a two-step reaction of "acylation followed by quaternization". The reaction conditions are mild and the post-treatment only requires washing and low-temperature drying, which is in line with the concept of green chemical production and is easy to scale up industrially.

[0029] 5. Strong compatibility and stable performance: The lubricant of this invention is easily dispersed in water-based drilling fluids and has good compatibility with treatment agents such as filtration loss reducers and shale inhibitors. It does not damage the rheological properties and filtration performance of drilling fluids. At the same time, it can alleviate the problem of molecular chain coiling in high-salt environments, ensuring the formation of a stable lubricating film under complex formation conditions and continuously exerting a friction-reducing effect. Attached Figure Description

[0030] Figure 1 The infrared spectrum of the modified drilling fluid lubricant based on edible fungus waste prepared in Example 1.

[0031] Figure 2 Physical images of the drilling fluid lubricants prepared for Comparative Example 1 and Example 1. Detailed Implementation

[0032] The present invention will be further described below through specific embodiments, but is not limited thereto.

[0033] Unless otherwise specified, the experimental methods described in the examples are conventional methods; the reagents and materials used are commercially available unless otherwise specified.

[0034] Example 1 A method for preparing a modified drilling fluid lubricant based on edible fungi waste includes the following steps: (1) Take the oyster mushroom stem waste, wash it with deionized water to remove impurities, dry it at 60℃ to constant weight, and pulverize it to 60 mesh to obtain edible fungus waste powder; take 100g of the above edible fungus waste powder, add it to 1000mL of sodium hydroxide aqueous solution with a mass fraction of 3%, and stir and extract it at 80℃ for 3h; after extraction, filter it while hot with a 200-mesh filter cloth, collect the filtrate, cool it naturally to room temperature, adjust the pH of the obtained filtrate to 6 with hydrochloric acid aqueous solution with a mass fraction of 10%, add 3000mL of ethanol aqueous solution (the volume fraction of ethanol in the ethanol aqueous solution is 95%), stir evenly and let it stand for 12h; after pouring out the supernatant, centrifuge the obtained lower precipitate (4000rpm, 10min), wash the centrifuged precipitate with anhydrous ethanol and acetone twice each; dry the washed precipitate under vacuum at 60℃ to constant weight to obtain the extract; (2) Add 10g of the extract obtained in step (1) to 200mL of deionized water-acetone mixed solvent (the volume ratio of acetone to deionized water in the mixed solvent is 3:7), stir and disperse evenly, adjust the pH to 9.5 with 15% sodium hydroxide aqueous solution, heat to 60℃, add benzoic anhydride acetone solution (4g of benzoic anhydride dissolved in 10mL of acetone) dropwise at a rate of 1 drop / s, and after the addition is completed, keep the temperature at 60℃ for 5h to obtain the acylation reaction solution; (3) Add 8g of choline chloride to the acylation reaction solution obtained in step (2), maintain the temperature at 60℃, and continue the reaction for 5h; (4) After the reaction is completed, the pH of the resulting reaction solution is adjusted to neutral with a 5% hydrochloric acid aqueous solution, filtered, and the precipitate obtained by filtration is washed three times with anhydrous ethanol. The precipitate obtained by washing is then dried at 60°C for 24 hours and pulverized to obtain a modified drilling fluid lubricant based on edible fungi waste.

[0035] The infrared spectrum of the modified drilling fluid lubricant based on edible fungi waste prepared in this embodiment is shown below. Figure 1 As shown, 3443.33cm -1 The absorption peak at 2824.05 cm⁻¹ is attributed to the stretching vibrations of OH or NH, indicating that some hydroxyl or amino groups are retained in the extract; -1 and 2714.46cm -1The absorption peaks at 1600 cm⁻¹ are attributed to the CH stretching vibrations of methyl (-CH₃) and methylene (-CH₂-), respectively, corresponding to the alkyl structure of the polysaccharide skeleton; this indicates that the extract retains the hydrocarbon skeleton of the polysaccharide or lignocellulose component; -1 The observed stretching vibration peaks of the benzene ring skeleton confirm the introduction of the benzene ring structure, proving the successful grafting of phenylacylation and providing rigid support at high temperatures; 1068.01 cm⁻¹ -1 The absorption peak at 771.37 cm⁻¹ is attributed to the glycosidic bond of COC or the stretching vibration of C-OH in the polysaccharide structure, indicating that the main polysaccharide skeleton of the extract remained intact during the reaction; Meanwhile, the absorption peak at 771.37 cm⁻¹ is... -1 The presence of characteristic absorption peaks of quaternary ammonium salts nearby indicates that the quaternization reaction was successfully completed. In summary, the infrared spectroscopy analysis results show that the lubricant prepared in Example 1 successfully introduced phenyl and quaternary ammonium salt groups while retaining the main polysaccharide structure of the extract. This bifunctional structure provides a molecular-level structural basis for improving the high-temperature stability and lubrication performance of the lubricant.

[0036] A photograph of the modified drilling fluid lubricant based on edible fungus waste obtained in this embodiment is shown below. Figure 2 As shown.

[0037] Example 2 A method for preparing a modified drilling fluid lubricant based on edible fungi waste is described in Example 1, except that: in step (2), an equal mass of benzoyl chloride is used instead of benzoic anhydride, and benzoyl chloride is directly added to the system at a dropping rate of 1 drop / s.

[0038] Example 3 A method for preparing a modified drilling fluid lubricant based on edible fungi waste is described in Example 1, except that in step (3), an equal mass of glycidyltrimethylammonium chloride is used instead of choline chloride.

[0039] Example 4 A method for preparing a modified drilling fluid lubricant based on edible fungus waste is described in Example 1, except that: in step (2), the reaction temperature is 55°C and the reaction time is 4.5h; in step (3), the reaction temperature is 55°C and the reaction time is 4.5h.

[0040] Example 5 A method for preparing a modified drilling fluid lubricant based on edible fungi waste is described in Example 1, except that: the amount of benzoic anhydride used in step (2) is 3g; and the amount of choline chloride used in step (3) is 6g.

[0041] Example 6 A method for preparing a modified drilling fluid lubricant based on edible fungus waste is described in Example 1, except that: the amount of benzoic anhydride used in step (2) is 5g; and the amount of choline chloride used in step (3) is 10g.

[0042] Comparative Example 1 A method for preparing a drilling fluid lubricant based on edible fungi waste is as described in Example 1, except that steps (2)-(4) are not performed.

[0043] The actual photograph of the drilling fluid lubricant based on edible fungus waste obtained in this comparative example is shown below. Figure 2 As shown.

[0044] Comparative Example 2 A method for preparing a modified drilling fluid lubricant based on edible fungus waste is described in Example 1, except that in step (2), the amount of benzoic anhydride used is 2g, and other conditions remain unchanged.

[0045] Comparative Example 3 A method for preparing a modified drilling fluid lubricant based on edible fungus waste is described in Example 1, except that in step (3), the amount of choline chloride is changed to 4g, while other conditions remain unchanged.

[0046] Comparative Example 4 A method for preparing a modified drilling fluid lubricant based on edible fungi waste includes the following steps: (1) Same as step (1) in Example 1; (2) Same as step (2) in Example 1; (3) Adjust the pH of the reaction solution obtained in step (2) to neutral with a 5% hydrochloric acid aqueous solution, filter, wash the precipitate obtained by filtration with anhydrous ethanol three times, dry the precipitate obtained by washing at 60°C for 24 hours, and pulverize it to obtain a modified drilling fluid lubricant based on edible fungi waste.

[0047] In this comparative example, only acylation modification was performed.

[0048] Comparative Example 5 A method for preparing a modified drilling fluid lubricant based on edible fungi waste includes the following steps: (1) Same as step (1) in Example 1; (2) Add 10g of the extract obtained in step (1) to 200mL of deionized water, stir and disperse evenly, adjust the pH to 9.5 with 15% sodium hydroxide aqueous solution, heat to 60℃, add 8g of choline chloride, maintain the temperature at 60℃ and react for 5h; after the reaction is completed, adjust the pH of the obtained reaction solution to neutral with 5% hydrochloric acid aqueous solution, filter, wash the precipitate obtained by filtration with anhydrous ethanol 3 times, dry the precipitate obtained by washing at 60℃ for 24h, and pulverize to obtain the modified drilling fluid lubricant based on edible fungus waste.

[0049] In this comparative example, only quaternization modification was performed.

[0050] Comparative Example 6 A drilling fluid lubricant based on mycelial xylan bifunctional modification is described in Example 1, except that step (1) is omitted and the extract is replaced with chitosan in step (2).

[0051] Experimental Example 1 The apparent viscosity and lubrication performance of the lubricants prepared in the examples and comparative examples were tested.

[0052] 1. Apparent viscosity test Preparation of base slurry: Add 20g of bentonite to 400mL of distilled water, stir at high speed (11000r / min) for 20min to fully hydrate it, then add 0.7g of sodium carbonate and continue stirring at high speed (11000r / min) for 20min. Cure at room temperature in a sealed environment for 16h to obtain base slurry for later use. Preparation of sample slurry: The lubricant prepared in the examples and comparative examples was added to the base slurry. The mass of the lubricant added was 0.5% of the mass of the base slurry. The mixture was stirred at high speed (11000 r / min) for 5 min to obtain the sample slurry.

[0053] Referring to the standard GB / T16783.1-2014 "Field Testing of Drilling Fluids for Petroleum and Natural Gas Industry - Part 1: Water-based Drilling Fluids", the apparent viscosity (AV) was tested using a six-speed rotational viscometer. First, the initial apparent viscosity was tested at room temperature. Then, the sample slurry was placed in a high-temperature aging tank and hot-rolled at 180°C for 24 hours. After cooling to room temperature, the apparent viscosity was tested again, and the viscosity retention was calculated. The results are shown in Table 1.

[0054] Table 1 Apparent viscosity test data

[0055] Test results show that the viscosity retention rate of the unmodified lubricant in Comparative Example 1 after high-temperature aging was only 28.1%, while the viscosity retention rates of Comparative Example 4 (acylation modification only) and Comparative Example 5 (quaternization modification only) were 32.8% and 38.8%, respectively, significantly lower than that of the sample in Example 1. The viscosity retention rates of Comparative Example 2 (insufficient acylation reagent) and Comparative Example 3 (insufficient quaternization reagent) were 50.0% and 47.2%, respectively, indicating that single functionalization or insufficient reagent dosage is difficult to effectively improve high-temperature stability. The viscosity retention rates of the bifunctionalized lubricant samples (Examples 1-6) of this invention all exceeded 60%, significantly higher than those of the comparative examples, indicating that the modified lubricant has better structural stability under high-temperature conditions and can avoid lubricating film rupture caused by a sharp drop in viscosity.

[0056] 2. Lubrication performance test Preparation of base slurry: Add 20g of bentonite to 400mL of distilled water, stir at high speed (11000r / min) for 20min to fully hydrate it, then add 0.7g of sodium carbonate and continue stirring at high speed (11000r / min) for 20min. Cure at room temperature in a sealed environment for 16h to obtain base slurry for later use. Preparation of sample slurry: The lubricant prepared in the examples and comparative examples was added to the base slurry. The mass of the lubricant added was 0.5% of the mass of the base slurry. The mixture was stirred at high speed (11000 r / min) for 5 min to obtain the sample slurry.

[0057] Test method: Referring to standard Q / SY17088-2016 "Technical Specification for Liquid Lubricants for Drilling Fluids", the lubrication coefficient was tested using an EP-2A extreme pressure lubrication tester; the sample slurry was placed in a high-temperature aging tank and hot-rolled at 180℃ for 24 hours, and the lubrication coefficient was tested again after cooling to room temperature; the lubrication coefficient reduction rate was calculated. The test results are shown in Table 2.

[0058] Table 2 Lubrication coefficient test data

[0059] Test results show that the lubricant prepared in this invention (Examples 1-6), with an addition of 0.5%, exhibits a lubrication coefficient reduction rate of >92% before aging and a lubrication coefficient reduction rate of >86% after hot rolling aging at 180℃ for 24 hours, significantly superior to the comparative examples. Specifically, the lubrication coefficient reduction rates after aging for Comparative Example 4 (acylation modification only) and Comparative Example 5 (quaternization modification only) were 54.5% and 53.1%, respectively, while the lubrication coefficient reduction rates after aging for Comparative Example 2 (insufficient acylation reagent) and Comparative Example 3 (insufficient quaternization reagent) were 60.9% and 59.1%, respectively, all far lower than the bifunctional modified samples. This demonstrates that the synergistic effect of the phenyl group and the quaternary ammonium salt group is key to achieving high-efficiency lubrication and high-temperature stability.

Claims

1. A method for preparing a modified drilling fluid lubricant based on edible fungi waste, characterized in that, The steps include the following: (1) Add the edible fungus waste powder to an aqueous sodium hydroxide solution for extraction, then filter to obtain a filtrate; adjust the pH of the obtained filtrate to 6-7, add an aqueous ethanol solution, stir and let stand, centrifuge, wash and dry the lower precipitate obtained after standing to obtain an extract; the edible fungus waste powder is obtained by washing, drying and crushing edible fungus waste, the edible fungus waste includes the roots or stems of shiitake mushrooms, oyster mushrooms, king oyster mushrooms, tea tree mushrooms, straw mushrooms and enoki mushrooms; (2) Add the extract obtained in step (1) to a deionized water-acetone mixed solvent, stir evenly, adjust the pH to 9-10, add an acylation reagent, and carry out an acylation reaction; then add a quaternization reagent to carry out a quaternization reaction; after the reaction is completed, after post-processing, a modified drilling fluid lubricant based on edible fungi waste is obtained; the acylation reagent is benzoic anhydride or benzoyl chloride, and the mass ratio of the acylation reagent to the extract is 0.3-0.5:1; the quaternization reagent is choline chloride or glycidyltrimethylammonium chloride, and the mass ratio of the quaternization reagent to the extract is 0.6-1:

1.

2. The method for preparing the modified drilling fluid lubricant based on edible fungus waste according to claim 1, characterized in that, The cleaning in step (1) is done with deionized water; the drying is done at 60-70℃ to constant weight; the particle size of the edible fungus waste powder is 60-80 mesh; the mass fraction of the sodium hydroxide aqueous solution is 2-4%; the volume ratio of the sodium hydroxide aqueous solution to the mass of the edible fungus waste powder is 5-20 mL:1 g; the extraction temperature is 75-85℃; and the extraction time is 2-4 h.

3. The preparation method of the modified drilling fluid lubricant based on edible fungus waste according to claim 1, characterized in that, In step (1), the pH of the filtrate is adjusted to 6-7 using a hydrochloric acid aqueous solution with a mass fraction of 5-15%; the volume percentage of ethanol in the ethanol aqueous solution is 90-95%; the volume ratio of the ethanol aqueous solution to the mass of the edible fungus waste powder is 20-40 mL: 1 g; the washing is performed by washing with anhydrous ethanol and acetone 2-3 times each; the drying is performed by vacuum drying at 60-70℃ to constant weight.

4. The method for preparing the modified drilling fluid lubricant based on edible fungus waste according to claim 1, characterized in that, In step (2), the volume ratio of acetone to deionized water in the deionized water-acetone mixed solvent is 3:3-7; the volume ratio of the deionized water-acetone mixed solvent to the mass of the extract is 10-30 mL:1 g. In step (2), the pH is adjusted to 9-10 using a sodium hydroxide aqueous solution with a mass fraction of 10-20%.

5. The method for preparing the modified drilling fluid lubricant based on edible fungi waste according to claim 1, characterized in that, The acylation reagent described in step (2) is added to the system at a dropping rate of 1-2 drops / s; when the acylation reagent is benzoic anhydride, it is added to the system in the form of benzoic anhydride acetone solution with a concentration of 0.3-0.5 g / mL.

6. The method for preparing the modified drilling fluid lubricant based on edible fungi waste according to claim 1, characterized in that, The temperature of the acylation reaction in step (2) is 55-65℃, and the time of the acylation reaction is 4-6h.

7. The method for preparing the modified drilling fluid lubricant based on edible fungus waste according to claim 1, characterized in that, The temperature of the quaternization reaction in step (2) is 55-65℃, and the time of the quaternization reaction is 4-6h.

8. The method for preparing the modified drilling fluid lubricant based on edible fungus waste according to claim 1, characterized in that, The post-processing steps in step (2) are as follows: the reaction solution obtained from the quaternization reaction is naturally cooled to room temperature, the pH is adjusted to neutral using a hydrochloric acid aqueous solution with a mass fraction of 5-10%, then filtered, the precipitate obtained by filtration is washed 2-4 times with anhydrous ethanol, then dried at 55-65℃ for 20-30h, and then pulverized to obtain a modified drilling fluid lubricant based on edible fungi waste.

9. A modified drilling fluid lubricant based on edible fungi waste, characterized in that, It is prepared by the preparation method described in any one of claims 1-8.

10. The application of the modified drilling fluid lubricant based on edible fungus waste as described in claim 9 in water-based drilling fluids.

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