High-temperature-resistant drilling fluid lubricant and production process thereof

Abstract

The invention discloses a high-temperature-resistant drilling fluid lubricant and a production process thereof, and relates to the field of lubricants, and the high-temperature-resistant drilling fluid lubricant comprises the following raw materials in parts by weight: 90-100 parts of biodiesel, 0.8-1.0 part of a surfactant, 0.8-1.0 part of an emulsifier, 12-16 parts of modified alkyl glycoside, 4-6 parts of modified microspheres, and 0.5-0.7 part of a dispersant. The synthesized modified alkyl glycoside comprises an imidazole quaternary ammonium cation, an ester group and a hindered phenol structure, and the oxidation resistance, the high temperature resistance and the corrosion resistance of the drilling fluid lubricant are improved. The synthesized modified microspheres comprise silicon dioxide microspheres and a polymerized carbodiimide structure, so that the hydrolysis resistance, high temperature resistance and wear resistance of the drilling fluid lubricant are improved.

Description

Technical Field

[0001] The invention relates to the field of lubricants, and in particular to a high-temperature resistant drilling fluid lubricant and a production process thereof. Background Art

[0002] Drilling fluid is mainly composed of liquid phase, solid phase and chemical treatment agent. The liquid phase can be water (fresh water, salt water), oil (crude oil, diesel) or emulsion (mixed oil emulsion and invert emulsion), the solid phase includes useful solid phase (bentonite, weighting material) and useless solid phase (rock), and the chemical treatment agent includes inorganic, organic and polymer compounds. Drilling fluid lubricant is a kind of chemical treatment agent, which is mainly used to reduce the friction resistance between the drill bit and the surface of the rock, the drill tool and the casing or the well wall, and reduce the occurrence of accidents such as stuck drill. Drilling fluid lubricants can be divided into solid and liquid types according to their phase state. Compared with solid lubricants, drilling fluid liquid lubricants are used more frequently. Compared with liquid lubricants, drilling fluid solid lubricants have better high temperature resistance. At present, the commonly used drilling liquid lubricants are mineral oils, animal and plant oils and fats, surfactants, etc.

[0003] Patent application number 201910933705.1 discloses a salt-resistant lubricant for drilling fluid and its preparation method, and obtains a salt-resistant lubricant with obvious salt resistance and good dispersibility, but still has the following shortcomings: (1) Biodiesel can be prepared from animal and vegetable oils and waste cooking oil, etc. Biodiesel itself contains oxygen and a large number of double bonds, which are prone to oxidation, polymerization and other reactions, and have certain corrosiveness to metals, rubbers, etc., which affects the use of biodiesel in drilling fluid lubricants; (2) Direct use of alkyl glycosides such as dodecyl glycoside has the disadvantages of needing to improve high temperature resistance and insufficient lubrication performance. In addition, biodiesel is mainly composed of fatty acid esters, and the ester group is easily hydrolyzed under acidic and alkaline conditions. Therefore, lubricants made of biodiesel and the like need to have certain hydrolysis resistance when used in drilling fluids. Solid lubricants such as silica microspheres can improve the wear resistance and lubricity of drilling fluid lubricants, but their surfaces contain a large number of hydroxyl groups, which are easy to aggregate and precipitate, and the direct addition method is not advisable.

[0004] Therefore, a suitable modification method is needed to make the performance of the drilling fluid liquid lubricant prepared from biodiesel, alkyl glycoside and silica microspheres more excellent, thereby broadening the application scope of the obtained drilling fluid lubricant. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a high temperature resistant drilling fluid lubricant and a production process thereof.

[0006] The purpose of the present invention can be achieved by the following technical solutions: A high temperature resistant drilling fluid lubricant comprises the following raw materials in parts by weight: 90-100 parts of biodiesel, 0.8-1.0 parts of surfactant, 0.8-1.0 parts of emulsifier, 12-16 parts of modified alkyl glycoside, 4-6 parts of modified microspheres, and 0.5-0.7 parts of dispersant; The surfactant is Span 60, the emulsifier is dodecylphenol polyoxyethylene ether, and the dispersant is sodium lignin sulfonate; The production process of the high temperature resistant drilling fluid lubricant comprises the following steps: Add biodiesel, surfactant, emulsifier, modified alkyl glycoside, modified microsphere and dispersant into a reaction kettle and stir for 15-25 minutes to obtain a high temperature resistant drilling fluid lubricant.

[0007] The modified alkyl glycoside is prepared by the following steps: Step A1: In a nitrogen atmosphere, 1-methyl-1H-imidazole-2-carboxaldehyde and acetic anhydride are added to a reaction bottle, refluxed and stirred, and the temperature is raised to 150-170° C., and potassium carbonate is added, and the reaction is stirred under reflux at a constant temperature for 24-26 hours, and unsaturated carboxylic acid is obtained by extraction, rotary evaporation, and drying; the unsaturated carboxylic acid is added to DMF, and dithionyl chloride is added under stirring, and the reaction is stirred under reflux at 50° C. for 4-5 hours to obtain an acyl chloride product; Further, the usage ratio of 1-methyl-1H-imidazole-2-carboxaldehyde, acetic anhydride, and potassium carbonate is 0.1 mol: 0.05-0.07 mol: 5-8 mmol; the usage ratio of unsaturated carboxylic acid, DMF, and dichlorothionyl is 0.1 mol: 35-45 mL: 0.12-0.15 mol; During the reaction of step A1, the aldehyde group of 1-methyl-1H-imidazole-2-carboxaldehyde reacts with acetic anhydride to generate a carboxylic acid containing a carbon-carbon double bond, i.e., an unsaturated carboxylic acid; the carboxyl group of the unsaturated carboxylic acid reacts with thionyl chloride to generate an acyl chloride product; Step A2: 3,5-di-tert-butyl-4-hydroxybenzyl alcohol, pyridine, triethylamine and dimethyl sulfoxide are added to a flask to obtain a mixed solution 1; the acyl chloride product is added to dimethyl sulfoxide to obtain a mixed solution 2, and the mixed solution 2 is slowly added dropwise to the mixed solution 1 in a 0°C ice-water bath. After the addition is completed, the temperature is raised to 40°C, and the reaction is stirred at a constant temperature for 8-10 hours, and then the temperature is raised to 100-110°C, and the stirring is continued for 1-2 hours, and the esterification product is obtained by distillation under reduced pressure; Further, the dosage ratio of 3,5-di-tert-butyl-4-hydroxybenzyl alcohol, pyridine, triethylamine and dimethyl sulfoxide is 0.1 mol: 0.01-0.015 mol: 0.1 mol: 50-60 mL; the dosage ratio of the acyl chloride product and dimethyl sulfoxide is 0.1 mol: 40-50 mL; the dosage ratio of the mixed solution 1 and the mixed solution 2 is 55-65 mL: 45-55 mL; During the reaction of step A2, the acyl chloride product reacts with the alcoholic hydroxyl group of 3,5-di-tert-butyl-4-hydroxybenzyl alcohol to generate an esterification product containing an imidazole ring and a hindered phenol; Step A3: Add 3-chloro-1,2-propanediol to deionized water, stir for 5-10 minutes, then add dodecyl glycoside, stir and react at 95-105° C. for 3-4 hours, cool to room temperature, adjust the pH to 7.3-7.5 with alkali solution, then add the esterification product, stir and react at 50-55° C. for 5-6 hours to obtain modified alkyl glycoside; Further, the usage ratio of 3-chloro-1,2-propylene glycol, deionized water, dodecyl glucoside, and esterification product is 0.4 mol: 90 mL: 0.4 mol: 0.4 mol; In the reaction process of step A3, 3-chloro-1,2-propylene glycol first reacts with dodecyl glucoside to generate 3-chloro-2-hydroxypropyl glucoside, and the chlorine atom of 3-chloro-2-hydroxypropyl glucoside then reacts with the tertiary amine of the imidazole ring in the esterification product to generate an alkyl glucoside containing an imidazole quaternary ammonium cation, i.e., a modified alkyl glucoside.

[0008] The modified microspheres are prepared by the following steps: Step B1: Add silica microspheres to toluene, ultrasonically disperse for 30 minutes, then add 3-(2,4-dinitrophenyl) propionic acid and N,N'-dicyclohexyl diimide under stirring at room temperature, heat to 115°C, reflux with constant temperature stirring for 48-54 hours, then centrifuge for 5-10 minutes, centrifuge the lower precipitate once with isopropanol and anhydrous ethanol, respectively, and then vacuum dry at 80°C for 12 hours to obtain silica microspheres containing nitro groups on the surface; Further, the amount ratio of silica microspheres, toluene, 3-(2,4-dinitrophenyl) propionic acid, N,N'-dicyclohexyldiimide, isopropanol and anhydrous ethanol is 10g; 110mL: 12g: 2g: 20mL: 20mL; During the reaction of step B1, the hydroxyl groups on the surface of the silica microspheres react with 3-(2,4-dinitrophenyl) propionic acid through a topological reaction to generate silica microspheres containing nitro groups on the surface; Step B2: Add silica microspheres containing nitro groups on the surface and ethyl acetate into a three-necked flask, heat to 45-55° C., start reflux stirring, then add sodium dithionite, and reflux stirring to react for 1-1.5 hours to obtain a dibasic aromatic primary amine; Furthermore, the amount ratio of the silica microspheres containing nitro groups on the surface, ethyl acetate, and sodium dithionite is 12-14 g: 150-160 mL: 0.2-0.25 mol; During the reaction of step B2, the nitro groups in the surface nitro-containing silica microspheres are reduced to amino groups to obtain dibasic aromatic primary amines; Step B3: Add xylene to a four-necked flask, introduce nitrogen, add dibasic aromatic primary amine and triphosgene at 75°C, respectively, and after the addition is completed, heat to 125°C and continue to react for 3.5 hours to obtain dibasic isocyanate; add dibasic isocyanate to a reaction bottle, then add 3-methyl-1-phenyl-2-phosphopentene-1-oxide, introduce nitrogen, heat to 165°C with stirring, and react at a constant temperature for 12 hours to obtain modified microspheres; Further, the usage ratio of xylene, dibasic aromatic primary amine and triphosgene is 220mL:16-18g:60-65g; the usage ratio of dibasic isocyanate and 3-methyl-1-phenyl-2-phospholene-1-oxide is 21-23g:3-3.5mmol; During the reaction of step B3, the amino group of the dibasic aromatic primary amine reacts with triphosgene to generate chloroamide, which is then heated to dehydrochlorinate to generate dibasic isocyanate; the dibasic isocyanate is catalytically decarbonated to generate modified microspheres containing a polymerized carbodiimide structure.

[0009] Beneficial effects of the invention: The invention discloses a high-temperature resistant drilling fluid lubricant, comprising the following raw materials: biodiesel, a surfactant, an emulsifier, a modified alkyl glycoside, a modified microsphere and a dispersant.

[0010] The synthesized modified alkyl glycoside contains imidazole-type quaternary ammonium cation, ester group and hindered phenol structure. The ester group is similar to the fatty acid ester structure in biodiesel, which makes the modified glycoside compatible and dispersible in the drilling fluid lubricant; hindered phenol can terminate the chain reaction of peroxyl free radicals participating in oxidative degradation, and it is grafted into dodecyl glycoside. After the modified alkyl glycoside is fully mixed with raw materials such as biodiesel and uniformly dispersed in the system, it can quickly terminate the oxidative degradation of biodiesel, etc., so that the drilling fluid lubricant has good anti-oxidative aging properties; after dodecyl glycoside is modified by imidazole-type quaternary ammonium cation, its high temperature resistance and lubrication properties are improved, and the imidazole ring can also complex with metals to stabilize the energy state of the metal surface, increase the activation energy of the corrosion reaction, and reduce the corrosion rate, so it can inhibit the corrosion of biodiesel to metals in drilling tools and avoid the degradation of the performance of drilling tools. Use modified alkyl glycoside to improve the oxidation resistance, high temperature resistance and corrosion resistance of drilling fluid lubricants.

[0011] The synthesized modified microspheres have the structure of silica microspheres and polymerized carbodiimide. After the surface of the silica microspheres is modified, they are not easy to aggregate and precipitate in the drilling fluid lubricant and can be more evenly dispersed. During the drilling process, the silica microspheres can withstand greater wear and tear, and the anti-wear performance is improved. The silica microspheres have good high temperature resistance and can make up for the shortcoming that the drilling fluid liquid lubricant is not resistant to high temperatures. The polymerized carbodiimide has a higher relative molecular mass and has the advantages of higher thermal stability and low usage and high performance compared to the monomeric carbodiimide. When biodiesel and the like are hydrolyzed in an acidic and alkaline environment to produce acidic substances, the carbodiimide can react with the acidic substances to avoid the acidic substances catalyzing the hydrolysis reaction, inhibit the hydrolysis reaction from continuing, and have a stable anti-hydrolysis effect. The modified microspheres are used to improve the hydrolysis resistance, high temperature resistance and wear resistance of the drilling fluid lubricant. DETAILED DESCRIPTION

[0012] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0013] Example 1 A modified alkyl glycoside, the preparation of which comprises the following steps: Step A1: In a nitrogen atmosphere, 1-methyl-1H-imidazole-2-carboxaldehyde and acetic anhydride are added to a reaction bottle, reflux and stir, and the temperature is raised to 150°C, and potassium carbonate is added, and the reaction is stirred at constant temperature for 24 hours, and the unsaturated carboxylic acid is obtained by extraction, rotary evaporation, and drying; the unsaturated carboxylic acid is added to DMF, and dithionyl chloride is added under stirring, and the reaction is refluxed and stirred at 50°C for 4 hours to obtain an acyl chloride product; the dosage ratio of 1-methyl-1H-imidazole-2-carboxaldehyde, acetic anhydride, and potassium carbonate is 0.1 mol: 0.05 mol: 5 mmol; the dosage ratio of unsaturated carboxylic acid, DMF, and dithionyl chloride is 0.1 mol: 35 mL: 0.12 mol; Step A2: 3,5-di-tert-butyl-4-hydroxybenzyl alcohol, pyridine, triethylamine and dimethyl sulfoxide are added to a flask to obtain a mixed solution 1; the acyl chloride product is added to dimethyl sulfoxide to obtain a mixed solution 2, and the mixed solution 2 is slowly added dropwise to the mixed solution 1 in a 0°C ice-water bath. After the addition is completed, the temperature is raised to 40°C, and the mixture is stirred at a constant temperature for 8 hours, and then the temperature is raised to 100°C, and the stirring is continued for 1 hour, and the esterification product is obtained by distillation under reduced pressure; the amount ratio of 3,5-di-tert-butyl-4-hydroxybenzyl alcohol, pyridine, triethylamine and dimethyl sulfoxide is 0.1 mol: 0.01 mol: 0.1 mol: 50 mL; the amount ratio of the acyl chloride product and dimethyl sulfoxide is 0.1 mol: 40 mL; the amount ratio of the mixed solution 1 to the mixed solution 2 is 55 mL: 45 mL; Step A3: Add 3-chloro-1,2-propylene glycol to deionized water, stir for 5 minutes, then add dodecyl glycoside, stir and react at 95°C for 3 hours, cool to room temperature, adjust the pH to 7.3 with alkali solution, then add the esterification product, stir and react at 50°C for 5 hours to obtain modified alkyl glycoside; the dosage ratio of 3-chloro-1,2-propylene glycol, deionized water, dodecyl glycoside and esterification product is 0.4 mol:90 mL:0.4 mol:0.4 mol.

[0014] Example 2 A modified alkyl glycoside, the preparation of which comprises the following steps: Step A1: In a nitrogen atmosphere, 1-methyl-1H-imidazole-2-carboxaldehyde and acetic anhydride are added to a reaction bottle, reflux and stir, and the temperature is raised to 160°C, and potassium carbonate is added, and the reaction is stirred at constant temperature for 25 hours, and the unsaturated carboxylic acid is obtained by extraction, rotary evaporation, and drying; the unsaturated carboxylic acid is added to DMF, and dithionyl chloride is added under stirring, and the reaction is refluxed and stirred at 50°C for 4.5 hours to obtain an acyl chloride product; the dosage ratio of 1-methyl-1H-imidazole-2-carboxaldehyde, acetic anhydride, and potassium carbonate is 0.1 mol: 0.06 mol: 5-8 mmol; the dosage ratio of unsaturated carboxylic acid, DMF, and dithionyl chloride is 0.1 mol: 40 mL: 0.13 mol; Step A2: 3,5-di-tert-butyl-4-hydroxybenzyl alcohol, pyridine, triethylamine and dimethyl sulfoxide are added to a flask to obtain a mixed solution 1; the acyl chloride product is added to dimethyl sulfoxide to obtain a mixed solution 2, and the mixed solution 2 is slowly added dropwise to the mixed solution 1 in a 0°C ice-water bath. After the addition is completed, the temperature is raised to 40°C, and the reaction is stirred at a constant temperature for 9 hours, and then the temperature is raised to 105°C, and the stirring is continued for 1.5 hours, and the esterification product is obtained by vacuum distillation; the amount ratio of 3,5-di-tert-butyl-4-hydroxybenzyl alcohol, pyridine, triethylamine and dimethyl sulfoxide is 0.1 mol: 0.013 mol: 0.1 mol: 55 mL; the amount ratio of the acyl chloride product and dimethyl sulfoxide is 0.1 mol: 45 mL; the amount ratio of the mixed solution 1 to the mixed solution 2 is 60 mL: 50 mL; Step A3: Add 3-chloro-1,2-propylene glycol to deionized water, stir for 8 minutes, then add dodecyl glycoside, stir and react at 100°C for 3.5 hours, cool to room temperature, adjust the pH to 7.4 with alkali solution, then add the esterification product, stir and react at 50°C for 5.5 hours to obtain modified alkyl glycoside; the dosage ratio of 3-chloro-1,2-propylene glycol, deionized water, dodecyl glycoside and esterification product is 0.4 mol:90 mL:0.4 mol:0.4 mol.

[0015] Example 3 A modified alkyl glycoside, the preparation of which comprises the following steps: Step A1: In a nitrogen atmosphere, 1-methyl-1H-imidazole-2-carboxaldehyde and acetic anhydride are added to a reaction bottle, reflux and stir, and the temperature is raised to 170°C, and potassium carbonate is added, and the reaction is stirred at constant temperature for 26 hours, and unsaturated carboxylic acid is obtained by extraction, rotary evaporation, and drying; unsaturated carboxylic acid is added to DMF, and dithionyl chloride is added under stirring, and the reaction is refluxed and stirred at 50°C for 5 hours to obtain an acyl chloride product; the dosage ratio of 1-methyl-1H-imidazole-2-carboxaldehyde, acetic anhydride, and potassium carbonate is 0.1 mol: 0.07 mol: 8 mmol; the dosage ratio of unsaturated carboxylic acid, DMF, and dithionyl chloride is 0.1 mol: 45 mL: 0.15 mol; Step A2: 3,5-di-tert-butyl-4-hydroxybenzyl alcohol, pyridine, triethylamine and dimethyl sulfoxide are added to a flask to obtain a mixed solution 1; the acyl chloride product is added to dimethyl sulfoxide to obtain a mixed solution 2, and the mixed solution 2 is slowly added dropwise to the mixed solution 1 in a 0°C ice-water bath. After the addition is completed, the temperature is raised to 40°C, and the reaction is stirred at a constant temperature for 10 hours, and then the temperature is raised to 110°C, and the stirring is continued for 2 hours, and the esterification product is obtained by distillation under reduced pressure; the amount ratio of 3,5-di-tert-butyl-4-hydroxybenzyl alcohol, pyridine, triethylamine and dimethyl sulfoxide is 0.1 mol: 0.015 mol: 0.1 mol: 60 mL; the amount ratio of the acyl chloride product and dimethyl sulfoxide is 0.1 mol: 50 mL; the amount ratio of the mixed solution 1 to the mixed solution 2 is 65 mL: 55 mL; Step A3: Add 3-chloro-1,2-propylene glycol to deionized water, stir for 10 minutes, then add dodecyl glycoside, stir and react at 105°C for 4 hours, cool to room temperature, adjust the pH to 7.5 with alkali solution, then add the esterification product, stir and react at 55°C for 6 hours to obtain modified alkyl glycoside; the dosage ratio of 3-chloro-1,2-propylene glycol, deionized water, dodecyl glycoside and esterification product is 0.4 mol:90 mL:0.4 mol:0.4 mol.

[0016] Example 4 A modified microsphere, the preparation of which comprises the following steps: Step B1: Add silica microspheres to toluene, ultrasonically disperse for 30 minutes, then add 3-(2,4-dinitrophenyl)propionic acid and N,N'-dicyclohexyl diimide at room temperature with stirring, heat to 115°C, reflux with constant temperature stirring for 48 hours, then centrifuge for 5 minutes, centrifuge the lower precipitate once with isopropanol and anhydrous ethanol respectively, and then vacuum dry at 80°C for 12 hours to obtain silica microspheres containing nitro groups on the surface; the amount ratio of silica microspheres, toluene, 3-(2,4-dinitrophenyl)propionic acid, N,N'-dicyclohexyl diimide, isopropanol and anhydrous ethanol is 10g; 110mL: 12g: 2g: 20mL: 20mL; Step B2: Add silica microspheres containing nitro groups on the surface and ethyl acetate into a three-necked flask, heat to 45°C, start reflux stirring, then add sodium dithionite, and reflux stirring for 1 hour to obtain a dibasic aromatic primary amine; the amount ratio of silica microspheres containing nitro groups on the surface, ethyl acetate, and sodium dithionite is 12g:150mL:0.2mol; Step B3: Add xylene to a four-necked flask, introduce nitrogen, add dibasic aromatic primary amine and triphosgene at 75°C respectively, and after the addition is completed, heat to 125°C and continue to react for 3.5 hours to obtain dibasic isocyanate; add dibasic isocyanate to a reaction bottle, then add 3-methyl-1-phenyl-2-phospholine-1-oxide, introduce nitrogen, heat to 165°C with stirring, and react at a constant temperature for 12 hours to obtain modified microspheres; the amount ratio of xylene, dibasic aromatic primary amine and triphosgene is 220mL:16g:60g; the amount ratio of dibasic isocyanate and 3-methyl-1-phenyl-2-phospholine-1-oxide is 21g:3mmol.

[0017] Example 5 A modified microsphere, the preparation of which comprises the following steps: Step B1: Add silica microspheres to toluene, ultrasonically disperse for 30 minutes, then add 3-(2,4-dinitrophenyl)propionic acid and N,N'-dicyclohexyl diimide with stirring at room temperature, heat to 115°C, reflux with constant temperature stirring for 51 hours, then centrifuge for 8 minutes, centrifuge the lower precipitate once with isopropanol and anhydrous ethanol respectively, and then vacuum dry at 80°C for 12 hours to obtain silica microspheres containing nitro groups on the surface; the amount ratio of silica microspheres, toluene, 3-(2,4-dinitrophenyl)propionic acid, N,N'-dicyclohexyl diimide, isopropanol and anhydrous ethanol is 10g; 110mL: 12g: 2g: 20mL: 20mL; Step B2: Add silica microspheres containing nitro groups on the surface and ethyl acetate into a three-necked flask, heat to 50°C, start reflux stirring, then add sodium dithionite, and reflux stirring to react for 1.3 hours to obtain a dibasic aromatic primary amine; the amount ratio of silica microspheres containing nitro groups on the surface, ethyl acetate, and sodium dithionite is 13g:155mL:0.23mol; Step B3: Add xylene to a four-necked flask, introduce nitrogen, add dibasic aromatic primary amine and triphosgene at 75°C respectively, and after the addition is completed, heat to 125°C and continue to react for 3.5 hours to obtain dibasic isocyanate; add dibasic isocyanate to a reaction bottle, then add 3-methyl-1-phenyl-2-phospholine-1-oxide, introduce nitrogen, heat to 165°C with stirring, and react at a constant temperature for 12 hours to obtain modified microspheres; the amount ratio of xylene, dibasic aromatic primary amine and triphosgene is 220mL:17g:63g; the amount ratio of dibasic isocyanate and 3-methyl-1-phenyl-2-phospholine-1-oxide is 22g:3.3mmol.

[0018] Example 6 A modified microsphere, the preparation of which comprises the following steps: Step B1: Add silica microspheres to toluene, ultrasonically disperse for 30 minutes, then add 3-(2,4-dinitrophenyl)propionic acid and N,N'-dicyclohexyl diimide with stirring at room temperature, heat to 115°C, reflux with constant temperature stirring for 54 hours, then centrifuge for 10 minutes, centrifuge the lower precipitate once with isopropanol and anhydrous ethanol respectively, and then vacuum dry at 80°C for 12 hours to obtain silica microspheres containing nitro groups on the surface; the amount ratio of silica microspheres, toluene, 3-(2,4-dinitrophenyl)propionic acid, N,N'-dicyclohexyl diimide, isopropanol and anhydrous ethanol is 10g; 110mL: 12g: 2g: 20mL: 20mL; Step B2: Add silica microspheres containing nitro groups on the surface and ethyl acetate into a three-necked flask, heat to 55° C., start reflux stirring, then add sodium dithionite, and reflux stirring to react for 1.5 hours to obtain a dibasic aromatic primary amine; the amount ratio of silica microspheres containing nitro groups on the surface, ethyl acetate, and sodium dithionite is 14 g: 160 mL: 0.25 mol; Step B3: Add xylene to a four-necked flask, introduce nitrogen, add dibasic aromatic primary amine and triphosgene at 75°C respectively, and after the addition is completed, heat to 125°C and continue to react for 3.5 hours to obtain dibasic isocyanate; add dibasic isocyanate to a reaction bottle, then add 3-methyl-1-phenyl-2-phospholine-1-oxide, introduce nitrogen, heat to 165°C with stirring, and react at a constant temperature for 12 hours to obtain modified microspheres; the amount ratio of xylene, dibasic aromatic primary amine and triphosgene is 220mL:18g:65g; the amount ratio of dibasic isocyanate and 3-methyl-1-phenyl-2-phospholine-1-oxide is 23g:3.5mmol.

[0019] Example 7 A high temperature resistant drilling fluid lubricant comprises the following raw materials in parts by weight: 90 parts of biodiesel, 0.8 parts of surfactant, 0.8 parts of emulsifier, 12 parts of modified alkyl glycoside, 4 parts of modified microspheres, and 0.5 parts of dispersant; the surfactant is Span 60, the emulsifier is dodecylphenol polyoxyethylene ether, and the dispersant is sodium lignin sulfonate; The production process of the high temperature resistant drilling fluid lubricant comprises the following steps: Biodiesel, surfactant, emulsifier, modified alkyl polyglycoside obtained in Example 1, modified microspheres obtained in Example 4 and dispersant were added to a reactor and stirred for 15 minutes to obtain a high temperature resistant drilling fluid lubricant.

[0020] Example 8 A high temperature resistant drilling fluid lubricant comprises the following raw materials in parts by weight: 95 parts of biodiesel, 0.9 parts of surfactant, 0.9 parts of emulsifier, 14 parts of modified alkyl glycoside, 5 parts of modified microspheres, and 0.6 parts of dispersant; the surfactant is Span 60, the emulsifier is dodecylphenol polyoxyethylene ether, and the dispersant is sodium lignin sulfonate; The production process of the high temperature resistant drilling fluid lubricant comprises the following steps: Biodiesel, surfactant, emulsifier, modified alkyl glycoside obtained in Example 2, modified microspheres obtained in Example 5 and dispersant were added to a reactor and stirred for 20 minutes to obtain a high temperature resistant drilling fluid lubricant.

[0021] Example 9 A high temperature resistant drilling fluid lubricant comprises the following raw materials in parts by weight: 100 parts of biodiesel, 1.0 parts of surfactant, 1.0 parts of emulsifier, 16 parts of modified alkyl glycoside, 6 parts of modified microspheres, and 0.7 parts of dispersant; the surfactant is Span 60, the emulsifier is dodecylphenol polyoxyethylene ether, and the dispersant is sodium lignin sulfonate; The production process of the high temperature resistant drilling fluid lubricant comprises the following steps: Biodiesel, surfactant, emulsifier, modified alkyl polyglycoside obtained in Example 3, modified microspheres obtained in Example 6 and dispersant were added to a reactor and stirred for 25 minutes to obtain a high temperature resistant drilling fluid lubricant.

[0022] Comparative Example 1 This comparative example is a commercially available high temperature resistant liquid lubricant for drilling fluid.

[0023] Comparative Example 2 Compared with Example 9, the esterification product in step A3 of Example 3 was replaced with 1,2-dimethylbenzimidazole-5-carboxylic acid methyl ester, that is, no hindered phenol structure was introduced, and a drilling fluid lubricant was prepared.

[0024] Comparative Example 3 Compared with Example 9, the 3-(2,4-dinitrophenyl)propionic acid in step B1 of Example 6 is replaced with hydrogenated cinnamic acid, and the modified microspheres s prepared according to step B1 of Example 6 replace the modified microspheres prepared in Example 6, that is, the polymerized carbodiimide structure is not introduced, and a drilling fluid lubricant is prepared.

[0025] The high temperature resistant drilling fluid lubricant prepared by the present invention is further tested for its effect, and the test results are as follows.

[0026] In order to test the high temperature resistant drilling fluid lubricant prepared by the present invention, the anti-wear performance of the drilling fluid lubricants of Examples 7-9 and Comparative Examples 1-3 was evaluated by using a KMY201-1A anti-wear tester; the anti-wear performance test mechanism is: under a certain external load, the drilling fluid rubs against each other between the steel ball and the grinding wheel, and under the condition of increasing the load (weight), the anti-wear performance of the lubricant is evaluated based on the maximum number of weights that cause the friction steel ball and the grinding wheel to lock when the oil film is finally broken; Preparation of bentonite-based slurry: Add bentonite, sodium carbonate and distilled water into a flask in the ratio of 20g:0.7g:400mL. After stirring with a high-speed stirrer for 10 minutes, remove the flask, scrape off the bentonite stuck to the side wall, continue stirring for 10 minutes, and then seal and cure at room temperature for 24 hours to obtain the bentonite-based slurry.

[0027] Lubrication coefficient reduction rate determination method: Take 300mL bentonite slurry, stir for 10 minutes, and measure the lubrication coefficient with an extreme pressure lubrication instrument. K0 , take another 300mL bentonite-based slurry, add 3g drilling fluid lubricant, stir for 10min, and measure the lubrication coefficient with an extreme pressure lubrication instrument K1 , lubrication coefficient reduction rate (%) = 100% ( K0-K1 ) / K0 , record the lubrication coefficient reduction rate; The drilling fluid lubricants of Examples 7-9 and Comparative Examples 1-3 were heated at 190°C for 16 hours, and the lubrication coefficient reduction rate after 190°C treatment was measured according to the above lubrication coefficient reduction rate measurement method to test the high temperature resistance; The drilling fluid lubricants of Examples 7-9 and Comparative Examples 1-3 were added to a 0.1 mol / L sodium hydroxide solution and hydrolyzed for 4 hours, and the lubrication coefficient reduction rate after hydrolysis was measured according to the above lubrication coefficient reduction rate measurement method to test the hydrolysis resistance; The drilling fluid lubricants of Examples 7-9 and Comparative Examples 1-3 were aged in an air oven at 80° C. for 12 h, and the lubrication coefficient reduction rate after oxygen aging was measured according to the above lubrication coefficient reduction rate measurement method to test the oxidation resistance; Refer to the standard method of GB / T5096-2017 "Petroleum Products Copper Plate Corrosion Test Method", put a polished copper sheet (polished copper sheet is light orange) into the drilling fluid lubricant, heat it to 50℃ and store it for 48 hours, then take out the copper sheet, clean it, and judge its corrosion condition according to its color change. If the orange color of the copper sheet surface deepens, it means that the copper sheet is corroded; The above test results are recorded in Table 1; Table 1: Example 7 Example 8 Example 9 Comparative Example 1 Comparative Example 2 Comparative Example 3 Anti-wear weight (800g / piece) 9 9 10 6 10 10 Lubrication coefficient reduction rate (%) 93.2 93.7 94.5 86.8 94.4 94.5 Lubrication coefficient reduction rate after aging at 190℃ for 16h (%) 88.9 89.1 89.8 81.2 89.7 89.8 Lubrication coefficient reduction rate after hydrolysis (%) 91.9 91.6 92.0 80.2 91.9 88.6 Lubrication coefficient reduction rate after oxygen aging (%) 90.5 90.8 91.2 80.9 88.5 91.1 Surface color of copper sheet light orange light orange light orange Dark Orange light orange light orange According to the data in Table 1, it can be seen from the comparison between Examples 7-9 and Comparative Example 1 that the high temperature resistant drilling fluid lubricant prepared by the present invention has good wear resistance, high temperature resistance, hydrolysis resistance, oxidation resistance and corrosion resistance. It can be seen from the comparison between Example 9 and Comparative Example 2 that the use of modified alkyl glycosides with hindered phenol structure is not only conducive to the improvement of high temperature resistance and corrosion resistance of the drilling fluid lubricant, but also conducive to the improvement of the anti-oxidation and aging performance of the drilling fluid lubricant. It can be seen from the comparison between Example 9 and Comparative Example 3 that the use of modified microspheres with polymerized carbodiimide structure makes the drilling fluid lubricant not only have good high temperature resistance and wear resistance, but also have good hydrolysis resistance.

[0028] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A high temperature resistant drilling fluid lubricant, characterized in that: The raw materials include the following parts by weight: 90-100 parts of biodiesel, 0.8-1.0 parts of surfactant, 0.8-1.0 parts of emulsifier, 12-16 parts of modified alkyl glycoside, 4-6 parts of modified microspheres, and 0.5-0.7 parts of dispersant; The modified alkyl glycoside is prepared by the following steps: Step A1: In a nitrogen atmosphere, 1-methyl-1H-imidazole-2-carboxaldehyde and acetic anhydride are added to a reaction bottle, refluxed and stirred, and the temperature is raised to 150-170° C., and potassium carbonate is added, and the reaction is stirred under reflux at a constant temperature for 24-26 hours, and unsaturated carboxylic acid is obtained by extraction, rotary evaporation, and drying; the unsaturated carboxylic acid is added to DMF, and dithionyl chloride is added under stirring, and the reaction is stirred under reflux at 50° C. for 4-5 hours to obtain an acyl chloride product; Step A2: 3,5-di-tert-butyl-4-hydroxybenzyl alcohol, pyridine, triethylamine and dimethyl sulfoxide are added to a flask to obtain a mixed solution 1; the acyl chloride product is added to dimethyl sulfoxide to obtain a mixed solution 2, and the mixed solution 2 is slowly added dropwise to the mixed solution 1 in a 0°C ice-water bath. After the addition is completed, the temperature is raised to 40°C, and the reaction is stirred at a constant temperature for 8-10 hours, and then the temperature is raised to 100-110°C, and the stirring is continued for 1-2 hours, and the esterification product is obtained by distillation under reduced pressure; Step A3: Add 3-chloro-1,2-propanediol to deionized water, stir for 5-10 minutes, then add dodecyl glycoside, stir and react at 95-105°C for 3-4 hours, cool to room temperature, adjust the pH to 7.3-7.5 with alkali solution, then add the esterification product, stir and react at 50-55°C for 5-6 hours to obtain modified alkyl glycoside.

2. A high temperature resistant drilling fluid lubricant according to claim 1, characterized in that: In step A1, the usage ratio of 1-methyl-1H-imidazole-2-carboxaldehyde, acetic anhydride and potassium carbonate is 0.1 mol: 0.05-0.07 mol: 5-8 mmol; the usage ratio of unsaturated carboxylic acid, DMF and dichlorothionyl is 0.1 mol: 35-45 mL: 0.12-0.15 mol.

3. The high temperature resistant drilling fluid lubricant according to claim 1, characterized in that: In step A2, the usage ratio of 3,5-di-tert-butyl-4-hydroxybenzyl alcohol, pyridine, triethylamine and dimethyl sulfoxide is 0.1 mol: 0.01-0.015 mol: 0.1 mol: 50-60 mL; the usage ratio of the acyl chloride product and dimethyl sulfoxide is 0.1 mol: 40-50 mL; and the usage ratio of the mixed solution 1 and the mixed solution 2 is 55-65 mL: 45-55 mL.

4. The high temperature resistant drilling fluid lubricant according to claim 1, characterized in that: In step A3, the usage ratio of 3-chloro-1,2-propanediol, deionized water, dodecyl glucoside and esterification product is 0.4 mol:90 mL:0.4 mol:0.4 mol.

5. The high temperature resistant drilling fluid lubricant according to claim 1, characterized in that: The modified microspheres are prepared by the following steps: Step B1: Add silica microspheres to toluene, ultrasonically disperse for 30 minutes, then add 3-(2,4-dinitrophenyl) propionic acid and N,N'-dicyclohexyl diimide under stirring at room temperature, heat to 115°C, reflux with constant temperature stirring for 48-54 hours, then centrifuge for 5-10 minutes, centrifuge the lower precipitate once with isopropanol and anhydrous ethanol, respectively, and then vacuum dry at 80°C for 12 hours to obtain silica microspheres containing nitro groups on the surface; Step B2: Add silica microspheres containing nitro groups on the surface and ethyl acetate into a three-necked flask, heat to 45-55° C., start reflux stirring, then add sodium dithionite, and reflux stirring to react for 1-1.5 hours to obtain a dibasic aromatic primary amine; Step B3: Add xylene to a four-necked flask, pass nitrogen, add dibasic aromatic primary amine and triphosgene at 75°C respectively, and after the addition is completed, heat to 125°C and continue to react for 3.5 hours to obtain dibasic isocyanate; add dibasic isocyanate to the reaction bottle, then add 3-methyl-1-phenyl-2-phosphopentene-1-oxide, pass nitrogen, heat to 165°C with stirring, and react at a constant temperature for 12 hours to obtain modified microspheres.

6. A high temperature resistant drilling fluid lubricant according to claim 5, characterized in that: In step B1, the amount ratio of silica microspheres, toluene, 3-(2,4-dinitrophenyl)propionic acid, N,N'-dicyclohexyldiimide, isopropanol and anhydrous ethanol is 10 g; 110 mL: 12 g: 2 g: 20 mL: 20 mL.

7. The high temperature resistant drilling fluid lubricant according to claim 5, characterized in that: In step B2, the usage ratio of the silica microspheres containing nitro groups on the surface, ethyl acetate and sodium dithionite is 12-14 g: 150-160 mL: 0.2-0.25 mol.

8. The high temperature resistant drilling fluid lubricant according to claim 5, characterized in that: In step B3, the usage ratio of xylene, dibasic aromatic primary amine and triphosgene is 220 mL: 16-18 g: 60-65 g; the usage ratio of dibasic isocyanate and 3-methyl-1-phenyl-2-phosphopentene-1-oxide is 21-23 g: 3-3.5 mmol.

9. The high temperature resistant drilling fluid lubricant according to claim 1, characterized in that: The surfactant is Span 60, the emulsifier is dodecylphenol polyoxyethylene ether, and the dispersant is sodium lignin sulfonate.

10. The production process of a high temperature resistant drilling fluid lubricant according to claim 1, characterized in that: The steps include: Add biodiesel, surfactant, emulsifier, modified alkyl glycoside, modified microsphere and dispersant into a reaction kettle and stir for 15-25 minutes to obtain a high temperature resistant drilling fluid lubricant.