CN115701452A - Main emulsifier for biomass synthetic base drilling fluid and preparation method thereof - Google Patents
Main emulsifier for biomass synthetic base drilling fluid and preparation method thereof Download PDFInfo
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Abstract
The invention provides a preparation method of a main emulsifier for a biomass synthetic base drilling fluid, which comprises the following steps: fatty amine and polybasic fatty acid ester react in the presence of a catalyst and a solvent to obtain a main emulsifier; the catalyst is lipase. The main emulsifier prepared from the fatty amine and the polybasic fatty acid ester is in a comb-shaped structure, and a biocatalysis method is adopted, so that the conversion rate can be improved, and byproducts can be reduced. The temperature resistance of the emulsifier prepared by the invention can reach 235 ℃, and the applicable density is 1.2g/cm 3 ～2.5g/cm 3 The mineral oil-based drilling fluid and the synthetic base drilling fluid.
Description
Technical Field
The invention relates to the technical field of drilling fluid, and particularly relates to a main emulsifier for biomass synthetic base drilling fluid and a preparation method thereof.
Background
Mineral oil-based and synthetic drilling fluids are widely used in oil and gas drilling because of their excellent temperature resistance, lubrication, inhibition properties, and the like. The mineral oil-based and synthetic-based drilling fluid mainly comprises base fluid, brine, organic soil, an emulsifier, a filtrate reducer, an alkalinity regulator, barite and the like. Among these, the stability of mineral oil-based, synthetic-based drilling fluids is largely dependent on the properties of the emulsifier. At present, the emulsifier used for mineral oil-based and synthetic-based drilling fluids is mature and mainly comprises carboxylic acid soap salt, sulfonic acid soap salt, organic acid ester, amide, polyoxyethylene ether and the like. Although the emulsifier is widely used and has good emulsifying, temperature resistance and other performances, the preparation process of the emulsifier has the defects of high temperature, pressurization and other conditions, a large amount of three wastes and the like, which causes high production cost of the emulsifier and adverse effects on the environment in the production process of part of the emulsifier, and is contrary to the advocated low-carbon environmental protection concept. Therefore, the development of a preparation method of the mineral oil-based and synthetic-based drilling fluid emulsifier which is low in energy consumption, mild in preparation conditions, environment-friendly and sustainable in development is of great significance.
The biological enzyme is a nontoxic and environment-friendly biological catalyst, is protein in chemical nature, and is widely applied to the fields of textile, papermaking, food processing, medicine and the like at present. The biological enzyme is used as a novel catalyst, has outstanding characteristics and obvious advantages, and is mainly reflected in high efficiency, specificity, mild reaction conditions, recyclability and the like.
Therefore, it is necessary to develop a method which is mild, and the product can resist high temperature and has strong emulsifying capacity.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a primary emulsifier for a biomass synthesis-based drilling fluid, which can resist high temperature and has good rheological properties.
The invention provides a preparation method of a main emulsifier for a biomass synthetic base drilling fluid, which comprises the following steps:
fatty amine and polybasic fatty acid ester react in the presence of a catalyst and a solvent to obtain a main emulsifier; the catalyst is lipase.
Preferably, the fatty amine is selected from one of dodecylamine, tetradecylamine, hexadecylamine, octadecylamine or oleylamine; the polybasic fatty acid ester is selected from trimethyl citrate or triethyl citrate.
Preferably, the lipase is selected from the group consisting of Novozym 435, lipozyme TLIM, lipomod TM One of L691MDP and Lipase No. 62310;
the solvent is selected from one of dodecyl methyl ether, lauryl amyl ether and tetradecyl butyl ether.
Preferably, the structure of the primary emulsifier is shown as formula (I):
in the formula, R 1 ，R 2 ，R 3 ＝-(CH) n -CH 3 ，n＝11，13，15，17。
Preferably, the total molar ratio of the fatty amine to the polybasic fatty acid ester is (3.0-3.1): 1.0.
Preferably, the preparation method of the main emulsifier for the biomass synthesis-based drilling fluid comprises the following steps:
a) Mixing and reacting polybasic fatty acid ester and partial fatty amine, and cooling to obtain a reactant;
b) Mixing the reactant with the rest part of fatty amine, a catalyst and a solvent, reacting, and then cooling to obtain the catalyst.
Preferably, the reaction temperature in the step a) is 140-160 ℃, and the reaction time is 6-8 h; the reaction temperature of the step b) is 50-90 ℃, and the reaction time is 12-24 h; and the temperature is reduced to 25-35 ℃.
Preferably, the mass ratio of the partial fatty amine to the rest fatty amine is (66-67): (33 to 34);
the catalyst accounts for 0.5-2% of the total mass of the fatty amine and the polybasic fatty acid ester, and the solvent accounts for 10-30% of the total mass of the fatty amine and the polybasic fatty acid ester.
The invention provides a main emulsifier for biomass synthetic base drilling fluid, which is prepared by any one of the preparation methods in the technical scheme.
The invention provides a drilling fluid, which comprises an emulsifier prepared by the preparation method in any one of the technical schemes.
Compared with the prior art, the invention provides a preparation method of a main emulsifier for a biomass synthetic base drilling fluid, which comprises the following steps: fatty amine and polybasic fatty acid ester react in the presence of a catalyst and a solvent to obtain a main emulsifier; the catalyst is lipase. The main emulsifier prepared from the fatty amine and the polybasic fatty acid ester is in a comb-shaped structure, and a biocatalysis method is adopted, so that the conversion rate can be improved, and byproducts can be reduced. The temperature resistance of the emulsifier prepared by the invention can reach 235 ℃, and the applicable density is 1.2g/cm 3 ～2.5g/cm 3 The mineral oil-based drilling fluid and the synthetic base drilling fluid.
Detailed Description
The invention provides a main emulsifier for biomass synthesis-based drilling fluid and a preparation method thereof, and a person skilled in the art can use the contents for reference and appropriately improve process parameters to realize the purpose. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the scope of the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
The invention provides a preparation method of a main emulsifier for a biomass synthetic base drilling fluid, which comprises the following steps:
fatty amine and polybasic fatty acid ester react in the presence of a catalyst and a solvent to obtain a main emulsifier; the catalyst is lipase.
The preparation method of the main emulsifier for the biomass synthetic base drilling fluid provided by the invention comprises the following steps of reacting fatty amine with polybasic fatty acid ester in the presence of a catalyst and a solvent; the preferable concrete is as follows:
a) Mixing and reacting polybasic fatty acid ester and partial fatty amine, and cooling to obtain a reactant;
b) Mixing the reactant with the rest part of fatty amine, a catalyst and a solvent, reacting, and then cooling to obtain the catalyst.
The reaction is preferably carried out in a reaction kettle, but the invention is not limited thereto.
In the present invention, the reaction conditions in step a) are such that the amount of partially added fatty amine is preferably 66 to 67%, more preferably 66.67%, of the total mass thereof.
The reaction temperature is 140-160 ℃, the reaction time is 6-8 h, preferably, the reaction temperature is 150 ℃, and the reaction time is 6h.
And cooling to room temperature after reaction.
In the invention, the reaction condition of the step b) is that the addition amount of the fatty amine is preferably 33 to 34 percent of the total mass of the fatty amine; more preferably 33.33%;
the addition of the lipase is 0.5-2% of the total mass of the fatty amine and the polybasic fatty acid ester, the addition of the solvent is 10-30% of the total mass of the fatty amine and the polybasic fatty acid ester, the reaction temperature is 50-90 ℃, and the reaction time is 12-24 hours; preferably, the addition amount of the lipase is 1 percent of the mass of the fatty amine and the polybasic fatty acid ester, the addition amount of the solvent is 20 percent of the total mass fraction of the fatty amine and the polybasic fatty acid ester, the reaction temperature is 80 ℃, and the reaction time is 12 hours. And cooling and discharging after reacting for a certain time to obtain the main emulsifier for the biomass synthetic base drilling fluid.
According to the invention, the mass ratio of the partial fatty amine to the remaining partial fatty amine is preferably (66 to 67): (33 to 34); more preferably 66.67:33.33.
the catalyst accounts for 0.5-2% of the total mass of the fatty amine and the polybasic fatty acid ester, and the solvent accounts for 10-30% of the total mass of the fatty amine and the polybasic fatty acid ester.
According to the invention, the fatty amine is preferably selected from one of dodecylamine, tetradecylamine, hexadecylamine, octadecylamine or oleylamine; more preferably dodecylamine and octadecylamine, and still more preferably octadecylamine.
The polybasic fatty acid ester is preferably selected from trimethyl citrate or triethyl citrate; more preferably triethyl citrate.
Wherein the lipase is preferably selected from the group consisting of Novozym 435, lipozyme TLIM, lipomod TM One of L691MDP and Lipase No. 62310; more preferably Lipozyme TLIM;
the solvent is selected from one of dodecyl methyl ether, lauryl amyl ether and tetradecyl butyl ether; more preferably tetradecylbutyl ether.
In a specific embodiment of the invention, lauryl amyl ether is prepared according to patent application No. 201710845975.8, lauryl methyl ether is from patent application No. 201811002980.3, and tetradecyl butyl ether is from patent application No. 201811003858.0. The solvent can be used as it is without distillation under reduced pressure. This is mainly due to the fact that conventional solvents in emulsifiers tend to destabilize the drilling fluid system and therefore need to be removed. The solvent can be used as base oil for preparing the drilling fluid at the same time, so that the solvent does not need to be removed. The embodiment of the invention selects the solvents, not only simplifies the preparation process, but also improves the compatibility of the emulsifier and the drilling fluid system, and is beneficial to the emulsification stability of the drilling fluid.
In some preferred embodiments of the present invention, the primary emulsifier has a structure represented by formula (I):
in the formula, R 1 ，R 2 ，R 3 ＝(CH) n -CH 3 ，n＝11，13，15，17。
According to the invention, the total molar ratio of the fatty amine to the polybasic fatty acid ester is (3.0-3.1): 1.0.
The invention provides a main emulsifier for biomass synthesis-based drilling fluid, which is prepared by any one of the preparation methods in the technical scheme.
The amine value of the main emulsifier is 5.65-12.34 mgKOH/g.
Compared with the traditional single straight chain emulsifier, the main emulsifier provided by the invention has a comb-shaped structure, can be firmly adsorbed on an oil-water interface, not only has stronger temperature resistance, but also has low addition amount.
Due to steric effects, resulting in grafting R 2 The carbon chain needs high temperature or uses expensive raw materials and catalysts, but the chemical synthesis method has low conversion rate and a plurality of byproducts, which cause waste of productivity and may generate harmful gas to cause damage to the environment. In the invention, the preparation method of the main emulsifier with the comb-shaped structure adopts a biological catalysis method, the method has the advantages of high selectivity, strong reaction specificity, mild reaction conditions, simple production process and high capacity utilization rate, and the generated alcohol can be repeatedly utilized to produce fatty acid ester with little harm to the environment.
The emulsifying property of the main emulsifier for the biomass synthetic base drilling fluid prepared by the invention is equivalent to that of the emulsifier for the traditional mineral oil base and synthetic base drilling fluids, the temperature resistance can reach 235 ℃, and the applicable drilling fluid density range is 1.2-2.5 g/cm 3 . The emulsifier prepared by the invention can be used for the mineral oil-based drilling fluid with high temperature, high density and low oil-water ratio, and is also suitable for the synthetic base drilling fluid.
The invention provides a drilling fluid, which comprises an emulsifier prepared by the preparation method in any one of the technical schemes.
The invention provides a drilling fluid which comprises the primary emulsifier for the biomass synthesis-based drilling fluid. Specifically, the embodiment of the invention provides a drilling fluid, which comprises the main emulsifier, base oil, auxiliary emulsifier, calcium chloride aqueous solution, organic soil, a filtrate reducer, calcium oxide and barite for the biomass synthetic base drilling fluid prepared by the scheme. Wherein the base oil comprises diesel oil, white oil and biomass base fluid; the organic soil can adopt quaternary ammonium salt modified bentonite, and the auxiliary emulsifier can adopt modified fatty acid derivatives and fatty acid amide derivatives. The filtrate reducer can adopt modified asphalt and modified humic acid.
The invention provides a preparation method of a main emulsifier for a biomass synthetic base drilling fluid, which comprises the following steps: fatty amine and polybasic fatty acid ester react in the presence of a catalyst and a solvent to obtain a main emulsifier; the catalyst is lipase. The main emulsifier prepared from the fatty amine and the polybasic fatty acid ester is in a comb-shaped structure, and a biocatalysis method is adopted, so that the conversion rate can be improved, and byproducts can be reduced. The temperature resistance of the emulsifier prepared by the invention can reach 235 ℃, and the applicable density is 1.2g/cm 3 ～2.5g/cm 3 The mineral oil-based drilling fluid and the synthetic base drilling fluid.
In order to further illustrate the present invention, the following describes a primary emulsifier for a biomass synthesis-based drilling fluid and a preparation method thereof in detail with reference to examples.
In the following examples:
the dodecylamine, octadecylamine, trimethyl citrate and triethyl citrate are all purchased from Aladdin reagent GmbH;
lipozyme TLIM was purchased from Novozymes corporation; lipomod TM L691MDP was purchased from Biocatalysts.
The mineral oil is No. 0 diesel oil and No. 3 white oil; the biomass base fluid is from a drilling engineering technology research institute of Central petrochemical Central China Petroleum engineering Limited company, and the patent application number is 201810743989.3; the organic soil is purchased from Sichuan creative energy petroleum engineering technology limited company; the auxiliary emulsifier SMEMUL-2 is purchased from Shanghai Kangcheng chemical industry Co., ltd; calcium oxide was purchased from Hubei Longhai chemical Co., ltd; oxidized asphalt was purchased from Henan Longxiang Petroleum adjuvant, inc.; barite was purchased from Xinzheng Meijiu Co., ltd.
The amine values in the examples of the invention were determined according to the standard HG/T3503-1989 octadecylamine.
Example 1
The total molar ratio of the octadecylamine and the triethyl citrate is 3.0, 25g of octadecylamine and 7.69g of triethyl citrate are measured. Adding 16.67g of octadecylamine and 7.69g of triethyl citrate into a reaction kettle in sequence, reacting for 6 hours at 150 ℃, and cooling to room temperature; adding 8.33g of residual octadecylamine, and respectively adding 0.33g of lipase Lipozyme TLIM and 6.54g of tetradecyl butyl ether according to 1 percent and 20 percent of the mass of the fatty amine and the polybasic fatty acid ester, reacting at 80 ℃ for 12 hours, cooling and discharging to obtain the primary emulsifier for the biomass synthetic base drilling fluid.
Example 2
The total molar ratio of the octadecylamine to the triethyl citrate is 3.1, 25g of octadecylamine and 8.27g of triethyl citrate are measured. Adding 16.67g of octadecylamine and 8.27g of triethyl citrate into a reaction kettle in sequence, reacting for 8 hours at 160 ℃, and cooling to room temperature; adding 8.33g of the rest octadecylamine, 2 percent and 30 percent of the mass of the fatty amine and the polybasic fatty acid ester, and respectively adding the lipase Lipomood TM 0.67g of L691MDP and 9.98g of dodecyl methyl ether, reacting for 24 hours at 90 ℃, cooling and discharging to obtain the main emulsifier for the biomass synthetic base drilling fluid.
Example 3
The total molar ratio of the octadecylamine and the trimethyl citrate is 3.0, 25g of octadecylamine and 7.24g of trimethyl citrate are measured. Adding 16.67g of octadecylamine and 7.24g of trimethyl citrate into a reaction kettle in sequence, reacting for 6 hours at 150 ℃, and cooling to room temperature; adding 8.33g of residual octadecylamine, and respectively adding 0.33g of lipase Lipozyme TLIM and 6.45g of tetradecyl butyl ether according to 1 percent and 20 percent of the mass of the fatty amine and the polybasic fatty acid ester, reacting at 50 ℃ for 24 hours, cooling and discharging to obtain the primary emulsifier for the biomass synthetic base drilling fluid.
Example 4
The total molar ratio of the dodecylamine to the triethyl citrate is 3.0, 25g of dodecylamine and 12.42g of triethyl citrate are measured. Adding 16.67g of dodecylamine and 12.42g of triethyl citrate into a reaction kettle in sequence, reacting for 6 hours at 150 ℃, and cooling to room temperature; adding 8.33g of residual lauryl amine, respectively adding 0.37g of lipase Lipozyme TLIM and 7.48g of tetradecyl butyl ether according to 1 percent and 20 percent of the mass of the fatty amine and the polybasic fatty acid ester, reacting at 80 ℃ for 12 hours, cooling and discharging to obtain the main emulsifier for the biomass synthetic base drilling fluid.
Example 5
A biomass primary emulsifier was obtained according to the preparation method of example 1, except that lipase was used 20 times as in example 1.
Comparative example 1
A biomass primary emulsifier was obtained according to the preparation method of example 1, except that no lipase was added in the preparation method of example 1.
Comparative example 2
The total molar ratio of the octadecylamine to the triethyl citrate is 3.0, the method comprises the following steps of adding 25g of octadecylamine and 7.69g of triethyl citrate into a reaction kettle in sequence, introducing nitrogen, reacting at 150 ℃ for 4 hours, heating to 180 ℃, reacting for 6 hours, cooling and discharging to obtain the emulsifier.
Comparative example 3
A biomass main emulsifier was obtained according to the preparation method of example 1, except that the total molar ratio of octadecylamine and triethyl citrate was 2.5.
Comparative example 4
The total molar ratio of the octadecylamine to the triethyl citrate is 3.0.
Amine value and LD of Biomass Main emulsifier prepared in inventive examples 1-5 and comparative examples 1-4 50 、BOD 5 /COD Cr The detection is carried out, and the detection result is shown in Table 1
Table 1 testing of biomass primary emulsifier performance
As shown in Table 1, the amine value of the biomass main emulsifier prepared in examples 1 to 5 is 5.65 to 12.34mgKOH/g, and it is shown in example 5 that the bio-enzyme still has good catalytic ability after being used for many times. Compared with the comparative example 1, the amine value of the product without adding the biological enzyme is 142.56mgKOH/g, which is much higher than that of the emulsifying agent prepared in the examples 1-5, and the amine value of the prepared product is higher and the conversion rate is low under the condition without adding the biological enzyme. Compared with the comparative example 2, the emulsifier prepared by the general chemical method needs higher temperature and inert gas is introduced to prevent the high-temperature oxidation of raw materials, and the emulsifier has higher amine value and lower conversion rate of products. Compared with the comparative example 4, the general catalyst is adopted, the reaction is not completely carried out, the amine value is higher, and the conversion rate of the product is lower.
Example 6
Biomass base fluid: 80% (volume parts), 20% calcium chloride aqueous solution by mass: 20% (parts by volume)
Based on the total volume of the diesel oil and the calcium chloride aqueous solution: sequentially adding 2% of organic soil by mass volume ratio, 2% of biomass main emulsifier prepared in example 1 by mass volume ratio, 2% of auxiliary emulsifier by mass volume ratio and 4% of oxidized asphalt by mass volume ratio into base fluid, stirring at high speed for 10 minutes, then adding calcium chloride aqueous solution, stirring at high speed for 5 minutes, then adding 3% of calcium oxide by mass volume ratio, stirring at high speed for 2 minutes, then barite, adjusting the density of the drilling fluid to 2.1g/cm 3 And stirring at a high speed for 20min to obtain the drilling fluid.
Example 7
The drilling fluid is obtained according to the preparation method of the example 10, the difference from the example 10 is that the volume ratio of the diesel oil to the calcium chloride aqueous solution is 65 -3 。
Example 8
The drilling fluid is obtained according to the preparation method of the example 10, and different from the example 10, the volume ratio of the diesel oil to the calcium chloride aqueous solution is 953% and density 2.5g/cm -3 。
Example 9
The drilling fluid was obtained according to the preparation method of example 10, except that the biomass primary emulsifier prepared in example 4 was used, in contrast to example 10.
Example 10
A drilling fluid was prepared according to the method of example 10, except that the base fluid was white oil as in example 10.
Example 11
The drilling fluid was obtained according to the preparation method of example 10, except that the base fluid was diesel oil as in example 10.
Comparative example 5
The drilling fluid is obtained according to the preparation method of the example 10, and the biomass main emulsifier prepared in the comparative example 3 is adopted, which is different from the example 10.
Comparative example 6
The drilling fluid was prepared according to the method of example 10, and different from example 10, a primary emulsifier SMEMUL-1 for oil-based mud and a secondary emulsifier SMEMUL-2 for oil-based mud, which were purchased from tiancheng chemical limited, economic city, were used, the amount of the primary emulsifier added was 3.0%, and the amount of the secondary emulsifier added was 3.0%.
Example 12
According to the method, the drilling fluid prepared in the examples 12 to 27 and the comparative examples 3 to 6 is filled into an aging kettle, placed in a roller furnace, rolled at 235 ℃ for 16 hours, and then the performance of the drilling fluid is measured according to the national standard GB/T16783.2-2012, part 2 of the field test of drilling fluid in the petroleum and gas industry: the oil-based drilling fluid "was run at 65 ℃ and the results are shown in table 2, table 2 being the performance test results for the drilling fluids prepared in the examples and comparative examples of the present invention.
TABLE 2 drilling fluid Properties
Wherein AV is apparent viscosity, PV is plastic viscosity, YP is dynamic shear force, gel is primary and final shear, ES is demulsification voltage, and HTHP is high-temperature high-pressure filtration loss.
As can be seen from Table 2, the drilling fluid prepared by using the main emulsifier for the biomass synthetic base drilling fluid is suitable for the drilling fluid with the density of 1.2g/cm 3 ～2.5g/cm 3 The mineral oil-based and synthetic-based drilling fluid system has strong temperature resistance which can reach 235 ℃, lower dosage, better flow pattern, lower high-temperature and high-pressure filtration loss, minimum oil-water ratio which can reach 65 and demulsification voltage which is more than 800V. Compared with the comparative example 5, the biomass main emulsifier triethyl citrate prepared in the comparative example 3 is excessive and is easy to degrade at high temperature, so that the stability of the drilling fluid is damaged, and the viscosity cutting, high-temperature and high-pressure filtration loss and low demulsification voltage are caused. Compared with the comparative example 6, the drilling fluid prepared by the emulsifier for the commercial oil-based drilling fluid has higher viscosity, high temperature and high pressure filtration loss and lower demulsification voltage, which indicates that the temperature resistance is poorer. It can be seen that the drilling fluid prepared by the main emulsifier for the biomass synthetic base drilling fluid has good rheological property and filtration loss control capability.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (10)
1. A preparation method of a main emulsifier for a biomass synthesis-based drilling fluid comprises the following steps:
fatty amine and polybasic fatty acid ester react in the presence of a catalyst and a solvent to obtain a main emulsifier; the catalyst is lipase.
2. The method according to claim 1, wherein the aliphatic amine is one selected from the group consisting of dodecylamine, tetradecylamine, hexadecylamine, octadecylamine and oleylamine; the polybasic fatty acid ester is selected from trimethyl citrate or triethyl citrate.
3. The method according to claim 1, wherein the lipase is selected from the group consisting of Novozym435、Lipozyme TLIM、Lipomod TM One of L691MDP and Lipase No. 62310;
the solvent is selected from one of dodecyl methyl ether, lauryl amyl ether and tetradecyl butyl ether.
4. The preparation method of claim 2, wherein the primary emulsifier has a structure represented by formula (I):
in the formula, R 1 ，R 2 ，R 3 ＝—(CH) n —CH 3 ，n＝11，13，15，17。
5. The method according to claim 1, wherein the total molar ratio of the fatty amine to the polybasic fatty acid ester is (3.0 to 3.1): 1.0.
6. The preparation method of claim 1, wherein the preparation method of the primary emulsifier for the biomass synthesis-based drilling fluid comprises the following specific steps:
a) Mixing and reacting polybasic fatty acid ester and partial fatty amine, and cooling to obtain a reactant;
b) Mixing the reactant with the rest part of fatty amine, a catalyst and a solvent, reacting, and then cooling to obtain the catalyst.
7. The preparation method of claim 1, wherein the reaction temperature of step a) is 140-160 ℃ and the reaction time is 6-8 h; the reaction temperature of the step b) is 50-90 ℃, and the reaction time is 12-24 h; the temperature reduction is to reduce the temperature to 25-35 ℃.
8. The method according to claim 1, wherein the mass ratio of the partial fatty amine to the remaining partial fatty amine is (66-67): (33 to 34);
the catalyst accounts for 0.5-2% of the total mass of the fatty amine and the polybasic fatty acid ester, and the solvent accounts for 10-30% of the total mass of the fatty amine and the polybasic fatty acid ester.
9. A primary emulsifier for biomass synthetic drilling fluid, which is characterized by being prepared by the preparation method of any one of claims 1 to 9.
10. A drilling fluid comprising the emulsifier prepared by the preparation method of any one of claims 1 to 9.
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