A kind of drilling fluid fluid loss reducer silicone-fluorine resin composite and preparation method thereof
Through the composite of silicon fluororesin and drilling fluid filtration loss loss agent, the problem of poor salt resistance in high-temperature and high-salt environments is solved, and the excellent filtration reduction effect and stability of drilling fluid is achieved.
Patent Information
- Application Number
- CN202311428041.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-31
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2043-10-31
AI Technical Summary
The existing drilling fluid filtration loss agent has poor salt resistance in high temperature and high salt environments, and its functional groups are relatively single, making it difficult to effectively control the filtration loss.
Using a composite of silicon fluororesin and drilling fluid filter reduction agent, a combination of multiple sulfonic acid-based strong hydration groups and amide groups, an excellent filtration reduction effect, rheology performance and resistance are formed by combining them. A composite with high temperature and salt resistance.
In high temperature and high salt environment, the composite can effectively reduce the filtration loss and form a thin and dense filter cake, which significantly improves the stability and service life of the drilling fluid.
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Figure CN117467095B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of drilling fluids, in particular to a drilling fluid fluid loss reducer silicone-fluorine resin composite and a preparation method thereof. Background Art
[0002] Drilling fluid filtration and filter cake formationDrilling fluid filtration is inevitable during the drilling process. Filter cake can be formed through filtration to protect the well wall. However, if the drilling fluid filtration is too large, it will easily cause shale swelling and collapse, resulting in well wall instability. Therefore, moderate control of filtration is one of the key characteristics of drilling fluid. The filtration of drilling fluid is closely related to the formation permeability. However, filter cake is produced at the same time as the drilling fluid is lost. When the drilling fluid is lost again, it must pass through the filter cake that has already been produced. For example, the document "Synthesis and Performance Evaluation of Polymer Fluid Loss Reducers for Oil-Based Drilling Fluids" uses acrylamide and octadecyl methacrylate as reaction monomers, azobisisobutyronitrile as initiator, divinylbenzene as cross-linker, and polyvinyl pyrrolidone as dispersant. The fluid loss reducer for oil-based drilling fluid is synthesized by dispersion polymerization. The fluid loss reducer has strong temperature resistance. When the system temperature reaches the glass transition temperature of the polymer, the polymer enters a highly elastic state, giving it a certain deformation ability, thereby achieving a good fluid loss reduction effect. However, the salt resistance is poor, the functional group is relatively single, and it cannot achieve a better fluid loss reduction effect. Summary of the invention
[0003] 1. Technical issues to be resolved
[0004] In view of the deficiencies in the prior art, the present invention provides a drilling fluid filtrate reducer silicone-fluororesin composite and a preparation method thereof, which has excellent filtration reduction effect, rheological properties, high temperature resistance and salt resistance.
[0005] (II) Technical solution
[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a drilling fluid fluid loss reducer silicone-fluororesin composite, which is made of the following components by mass fraction: 20-30% silicone-fluororesin, 8-12% dimethyldiallylammonium chloride, 6-10% acrylamide, 6-12% acrylonitrile, 12-14% 2-acrylamide-2-methylpropanesulfonic acid, 1-3% silane coupling agent, and 2-4% initiator.
[0007] Preferably, the preparation method of the silicone fluororesin is:
[0008] (1) Dissolve 0.4-0.6 g of chitosan in 0.12-0.15 mol / L dilute hydrochloric acid, and after dissolution, filter to obtain a clear solution, uniformly mix 1.2-2.3 g of ethyl orthosilicate and anhydrous ethanol, slowly add the mixture to the clear solution, stir at 20-25° C. for 10-16 h, then add 0.01-0.03 g of hydrogen fluoride solution, continue stirring for 10-20 min, and then let stand for 10-14 h to obtain chitosan-silica gel;
[0009] (2) adding deionized water to the chitosan-silica gel for washing once, and then washing with anhydrous ethanol for 2-4 times, each time for 5-6 hours, to obtain a pretreated gel, adding 0.4-0.8g of epichlorohydrin and 0.01-0.02g of perchloric acid to anhydrous ethanol for mixing, and then adding the pretreated gel thereto, standing at room temperature for 10-20 hours, and then washing away the residual epichlorohydrin and perchloric acid with anhydrous ethanol, and continuing to add a mixed solution of 1.2-1.4g of ethylenediamine and anhydrous ethanol, and reacting in a water bath at 40-60°C for 10-12 hours to obtain an amino-modified chitosan-silica gel;
[0010] (3) adding amino-modified chitosan-silica gel and acrylic acid to N,N-dimethylformamide solvent, stirring to dissolve, slowly adding 4-dimethylaminopyridine dropwise, reacting at 100-150° C. for 2-4 hours, and after the reaction is completed, removing the solvent by vacuum distillation, filtering, washing and drying to obtain an amidated gel;
[0011] (4) adding dodecafluoroheptyl methacrylate and amidated gel to petroleum ether for dissolution, slowly adding benzoyl peroxide initiator after dissolution is completed, reacting at 60-100° C. for 3-6 hours, removing the solvent by vacuum distillation, filtering, washing and drying to obtain a silicone fluororesin.
[0012] Preferably, the mass ratio of amino-modified chitosan-silica gel, acrylic acid, and 4-dimethylaminopyridine in (3) is 0.1-0.2:1:0.02-0.03.
[0013] Preferably, the mass ratio of dodecafluoroheptyl methacrylate, amidated gel and benzoyl peroxide in (4) is 1.2-1.5:1:0.03-0.05.
[0014] Preferably, the silane coupling agent is any one of vinyl triethoxysilane, 3-aminopropyl triethoxysilane, KH-560, and JH-M9002.
[0015] Preferably, the initiator is azobisisobutyronitrile or azobisisobutyronitrile amidine hydrochloride.
[0016] Preferably, the method comprises the following steps:
[0017] S1. Add deionized water to the reactor, stir and add dimethyldiallylammonium chloride, acrylamide, acrylonitrile, 2-acrylamide-2-methylpropanesulfonic acid and silane coupling agent in sequence, add sodium hydroxide to adjust the pH to 7-9 after dissolution, continue to add initiator, react at 60-120° C. for 5-8 hours to obtain a drilling fluid loss reducer;
[0018] S2, stirring and adding silicone-fluororesin to the drilling fluid filtrate reducer, mixing evenly at 70-120° C., completing the reaction, cooling, and obtaining a drilling fluid filtrate reducer silicone-fluororesin composite.
[0019] Preferably, the mass ratio of the silicone-fluororesin to the drilling fluid loss reducer in S2 is 2.1-2.5:2.2-3.1.
[0020] (III) Beneficial technical effects
[0021] The invention obtains a drilling fluid fluid loss reducer silicone-fluororesin composite by mixing silicone-fluororesin and a drilling fluid fluid loss reducer. The composite contains a plurality of sulfonic acid group strong hydration groups, hydrogen in the sulfonic acid group is easy to dissociate, and with the dissociation of hydrogen, the attraction to positive ions is weak, and the positive ions are not easy to enter the hydration layer of the sulfonic acid group, so that salt is not easy to cause precipitation of the sulfonic acid group-containing polymer, and thus the composite exhibits a good high temperature and salt resistance fluid loss reduction effect under a high temperature and high salt environment; amide groups and nitrile groups contained in the composite are adsorbed on the surface of clay particles through hydrogen bonds to form a firm adsorption layer, which is not easy to desorb at high temperature, thereby preventing the clay particles from flocculating and growing larger, and at the same time, fine particles disassembled under the circulation and stirring action of the drilling fluid can be stabilized by adsorption, and no longer adhere to grow larger, thereby greatly increasing the proportion of fine particles in the drilling fluid, thereby forming a thin and dense filter cake, and reducing the fluid loss; the silicone-fluororesin contains amide groups, hydroxyl groups, esters and multiple groups in the drilling fluid fluid loss reducer, which work together to reduce the fluid loss, high temperature resistance and salt resistance. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is the reaction formula of silicone fluorine resin. DETAILED DESCRIPTION
[0023] Example 1
[0024] (1) 0.4 g of chitosan was dissolved in 40 mL of 0.12 mol / L dilute hydrochloric acid. After the dissolution was completed, a clear solution was obtained by suction filtration. 1.2 g of tetraethyl orthosilicate and 10 mL of anhydrous ethanol were uniformly mixed and slowly added to the clear solution. The mixture was stirred at 20° C. for 10 h. Then, 0.01 g of hydrogen fluoride solution was added thereto. The mixture was stirred for 10 min and then allowed to stand for 10 h to obtain chitosan-silica gel.
[0025] (2) Add 90 mL of deionized water to the chitosan-silica gel and wash it once, then wash it twice with 40 mL of anhydrous ethanol, each time for 5 hours, to obtain a pretreated gel, add 0.4 g of epichlorohydrin and 0.01 g of perchloric acid to 50 mL of anhydrous ethanol and mix them, then add the pretreated gel thereto, let it stand at room temperature for 10 hours, then wash away the residual epichlorohydrin and perchloric acid with anhydrous ethanol, continue to add a mixed solution of 1.2 g of ethylenediamine and anhydrous ethanol, and react in a water bath at 40° C. for 10 hours to obtain an amino-modified chitosan-silica gel;
[0026] (3) adding 0.1 g of amino-modified chitosan-silica gel and 1 g of acrylic acid to N,N-dimethylformamide solvent, stirring to dissolve, slowly adding 0.02 g of 4-dimethylaminopyridine dropwise, reacting at 100° C. for 2 h, and after the reaction is completed, removing the solvent by vacuum distillation, filtering, washing and drying to obtain an amidated gel;
[0027] (4) adding 1.2 g of dodecafluoroheptyl methacrylate and 1 g of amidated gel to petroleum ether for dissolution, slowly adding 0.03 g of benzoyl peroxide initiator after dissolution, reacting at 60° C. for 3 h, removing the solvent by distillation under reduced pressure, filtering, washing and drying to obtain a silicone fluororesin;
[0028] (5) Add deionized water to the reactor, stir and sequentially add 3 g of dimethyldiallylammonium chloride, 2 g of acrylamide, 4 g of acrylonitrile, 5 g of 2-acrylamide-2-methylpropanesulfonic acid and 0.1 g of vinyltriethoxysilane, add sodium hydroxide after dissolution to adjust the pH to 7, continue to add 0.2 g of azobisisobutyronitrile, react at 60° C. for 5 h, and obtain a drilling fluid loss reducer;
[0029] (6) 2.1 g of silicone-fluororesin was added to 2.2 g of drilling fluid fluid loss reducer by stirring, and the mixture was mixed evenly at 70° C. After the reaction was completed, the mixture was cooled to obtain a drilling fluid fluid loss reducer silicone-fluororesin composite.
[0030] Example 2
[0031] (1) 0.6 g of chitosan was dissolved in 60 mL of 0.15 mol / L dilute hydrochloric acid. After the dissolution was completed, a clear solution was obtained by suction filtration. 2.3 g of tetraethyl orthosilicate and 20 mL of anhydrous ethanol were uniformly mixed and slowly added to the clear solution. The mixture was stirred at 25° C. for 16 h. 0.03 g of hydrogen fluoride solution was then added thereto. The mixture was stirred for 20 min and then allowed to stand for 14 h to obtain chitosan-silica gel.
[0032] (2) 110 mL of deionized water was added to the chitosan-silica gel for washing once, and then washed with 60 mL of anhydrous ethanol for 4 times, each time for 6 hours, to obtain a pretreated gel, 0.8 g of epichlorohydrin and 0.02 g of perchloric acid were added to 70 mL of anhydrous ethanol for mixing, and then the pretreated gel was added thereto, and the mixture was allowed to stand at room temperature for 20 hours, and then the residual epichlorohydrin and perchloric acid were washed away with anhydrous ethanol, and a mixed solution of 1.4 g of ethylenediamine and anhydrous ethanol was continuously added, and the mixture was reacted in a water bath at 60° C. for 12 hours to obtain an amino-modified chitosan-silica gel;
[0033] (3) Add 0.4 g of amino-modified chitosan-silica gel and 2 g of acrylic acid to N,N-dimethylformamide solvent, stir to dissolve, slowly drop 0.06 g of 4-dimethylaminopyridine, react at 150° C. for 4 h, and after the reaction is completed, remove the solvent by vacuum distillation, filter, wash and dry to obtain an amidated gel;
[0034] (4) adding 4.5 g of dodecafluoroheptyl methacrylate and 3 g of amidated gel to petroleum ether for dissolution, slowly adding 0.15 g of benzoyl peroxide initiator after dissolution, reacting at 100° C. for 6 h, removing the solvent by vacuum distillation, filtering, washing and drying to obtain a silicone fluororesin;
[0035] (5) Add deionized water to the reactor, stir and sequentially add 6 g of dimethyldiallylammonium chloride, 4 g of acrylamide, 5 g of acrylonitrile, 8 g of 2-acrylamide-2-methylpropanesulfonic acid and 0.3 g of 3-aminopropyltriethoxysilane, add sodium hydroxide to adjust the pH to 9 after dissolution, continue to add 0.4 g of azobisisobutyronitrile amidine hydrochloride, react at 120° C. for 8 h, and obtain a drilling fluid loss reducer;
[0036] (6) 2.5 g of silicone-fluororesin was added to 3.1 g of drilling fluid fluid loss reducer by stirring, and the mixture was mixed evenly at 120° C. After the reaction was completed, the mixture was cooled to obtain a silicone-fluororesin composite of a drilling fluid fluid loss reducer.
[0037] Example 3
[0038] (1) 0.5 g of chitosan was dissolved in 50 mL of 13.5 mol / L dilute hydrochloric acid. After the dissolution was completed, a clear solution was obtained by suction filtration. 1.75 g of tetraethyl orthosilicate and 15 mL of anhydrous ethanol were uniformly mixed and slowly added to the clear solution. The mixture was stirred at 22.5° C. for 13 h. Then, 0.02 g of hydrogen fluoride solution was added thereto. The mixture was stirred for 15 min and then allowed to stand for 12 h to obtain chitosan-silica gel.
[0039] (2) 100 mL of deionized water was added to the chitosan-silica gel for washing once, and then washed three times with 50 mL of anhydrous ethanol, each time for 5.5 hours, to obtain a pretreated gel, 0.6 g of epichlorohydrin and 0.015 g of perchloric acid were added to 60 mL of anhydrous ethanol for mixing, and then the pretreated gel was added thereto, and the mixture was allowed to stand at room temperature for 15 hours, and then the residual epichlorohydrin and perchloric acid were washed away with anhydrous ethanol, and a mixed solution of 1.3 g of ethylenediamine and anhydrous ethanol was added, and the mixture was reacted in a water bath at 50° C. for 11 hours to obtain an amino-modified chitosan-silica gel;
[0040] (3) Add 0.25 g of amino-modified chitosan-silica gel and 1.5 g of acrylic acid to N,N-dimethylformamide solvent, stir to dissolve, slowly drop 0.04 g of 4-dimethylaminopyridine, react at 125° C. for 3 h, and after the reaction is completed, remove the solvent by vacuum distillation, filter, wash and dry to obtain an amidated gel;
[0041] (4) adding 2.85 g of dodecafluoroheptyl methacrylate and 2 g of amidated gel to petroleum ether for dissolution, slowly adding 0.09 g of benzoyl peroxide initiator after dissolution, reacting at 80° C. for 4.5 h, removing the solvent by vacuum distillation, filtering, washing and drying to obtain a silicone fluororesin;
[0042] (5) Add deionized water to the reactor, stir and sequentially add 4.5 g of dimethyldiallylammonium chloride, 3 g of acrylamide, 4.5 g of acrylonitrile, 6.5 g of 2-acrylamide-2-methylpropanesulfonic acid and 0.2 g of vinyltriethoxysilane, add sodium hydroxide to adjust the pH to 8 after dissolution, continue to add 0.3 g of azobisisobutyronitrile amidine hydrochloride, react at 90° C. for 6.5 h, and obtain a drilling fluid loss reducer;
[0043] (6) 2.3 g of silicone-fluororesin was added to 2.65 g of drilling fluid fluid loss reducer by stirring, and the mixture was mixed evenly at 95° C. After the reaction was completed, the mixture was cooled to obtain a silicone-fluororesin composite of a drilling fluid fluid loss reducer.
[0044] Example 4
[0045] (1) 0.4 g of chitosan was dissolved in 40 mL of 0.12 mol / L dilute hydrochloric acid. After the dissolution was completed, a clear solution was obtained by suction filtration. 1.2 g of tetraethyl orthosilicate and 10 mL of anhydrous ethanol were uniformly mixed and slowly added to the clear solution. The mixture was stirred at 20° C. for 10 h. Then, 0.01 g of hydrogen fluoride solution was added thereto. The mixture was stirred for 10 min and then allowed to stand for 10 h to obtain chitosan-silica gel.
[0046] (2) Add 90 mL of deionized water to the chitosan-silica gel and wash it once, then wash it twice with 40 mL of anhydrous ethanol, each time for 5 hours, to obtain a pretreated gel, add 0.4 g of epichlorohydrin and 0.01 g of perchloric acid to 50 mL of anhydrous ethanol and mix them, then add the pretreated gel thereto, let it stand at room temperature for 10 hours, then wash away the residual epichlorohydrin and perchloric acid with anhydrous ethanol, continue to add a mixed solution of 1.2 g of ethylenediamine and anhydrous ethanol, and react in a water bath at 40° C. for 10 hours to obtain an amino-modified chitosan-silica gel;
[0047] (3) Add 0.4 g of amino-modified chitosan-silica gel and 2 g of acrylic acid to N,N-dimethylformamide solvent, stir to dissolve, slowly drop 0.06 g of 4-dimethylaminopyridine, react at 150° C. for 4 h, and after the reaction is completed, remove the solvent by vacuum distillation, filter, wash and dry to obtain an amidated gel;
[0048] (4) adding 4.5 g of dodecafluoroheptyl methacrylate and 3 g of amidated gel to petroleum ether for dissolution, slowly adding 0.15 g of benzoyl peroxide initiator after dissolution, reacting at 100° C. for 6 h, removing the solvent by vacuum distillation, filtering, washing and drying to obtain a silicone fluororesin;
[0049] (5) Add deionized water to the reactor, stir and sequentially add 4.5 g of dimethyldiallylammonium chloride, 3 g of acrylamide, 4.5 g of acrylonitrile, 6.5 g of 2-acrylamide-2-methylpropanesulfonic acid and 0.2 g of vinyltriethoxysilane, add sodium hydroxide to adjust the pH to 8 after dissolution, continue to add 0.3 g of azobisisobutyronitrile amidine hydrochloride, react at 90° C. for 6.5 h, and obtain a drilling fluid loss reducer;
[0050] (6) 2.3 g of silicone-fluororesin was added to 2.65 g of drilling fluid fluid loss reducer by stirring, and the mixture was mixed evenly at 95° C. After the reaction was completed, the mixture was cooled to obtain a silicone-fluororesin composite of a drilling fluid fluid loss reducer.
[0051] Example 5
[0052] (1) 0.6 g of chitosan was dissolved in 60 mL of 0.15 mol / L dilute hydrochloric acid. After the dissolution was completed, a clear solution was obtained by suction filtration. 2.3 g of tetraethyl orthosilicate and 20 mL of anhydrous ethanol were uniformly mixed and slowly added to the clear solution. The mixture was stirred at 25° C. for 16 h. 0.03 g of hydrogen fluoride solution was then added thereto. The mixture was stirred for 20 min and then allowed to stand for 14 h to obtain chitosan-silica gel.
[0053] (2) 110 mL of deionized water was added to the chitosan-silica gel for washing once, and then washed with 60 mL of anhydrous ethanol for 4 times, each time for 6 hours, to obtain a pretreated gel, 0.8 g of epichlorohydrin and 0.02 g of perchloric acid were added to 70 mL of anhydrous ethanol for mixing, and then the pretreated gel was added thereto, and the mixture was allowed to stand at room temperature for 20 hours, and then the residual epichlorohydrin and perchloric acid were washed away with anhydrous ethanol, and a mixed solution of 1.4 g of ethylenediamine and anhydrous ethanol was continuously added, and the mixture was reacted in a water bath at 60° C. for 12 hours to obtain an amino-modified chitosan-silica gel;
[0054] (3) Add 0.25 g of amino-modified chitosan-silica gel and 1.5 g of acrylic acid to N,N-dimethylformamide solvent, stir to dissolve, slowly drop 0.04 g of 4-dimethylaminopyridine, react at 125° C. for 3 h, and after the reaction is completed, remove the solvent by vacuum distillation, filter, wash and dry to obtain an amidated gel;
[0055] (4) adding 2.85 g of dodecafluoroheptyl methacrylate and 2 g of amidated gel to petroleum ether for dissolution, slowly adding 0.09 g of benzoyl peroxide initiator after dissolution, reacting at 80° C. for 4.5 h, removing the solvent by vacuum distillation, filtering, washing and drying to obtain a silicone fluororesin;
[0056] (5) Add deionized water to the reactor, stir and sequentially add 3 g of dimethyldiallylammonium chloride, 2 g of acrylamide, 4 g of acrylonitrile, 5 g of 2-acrylamide-2-methylpropanesulfonic acid and 0.1 g of vinyltriethoxysilane, add sodium hydroxide after dissolution to adjust the pH to 7, continue to add 0.2 g of azobisisobutyronitrile, react at 60° C. for 5 h, and obtain a drilling fluid loss reducer;
[0057] (6) 2.1 g of silicone-fluororesin was added to 2.2 g of drilling fluid fluid loss reducer by stirring, and the mixture was mixed evenly at 70° C. After the reaction was completed, the mixture was cooled to obtain a drilling fluid fluid loss reducer silicone-fluororesin composite.
[0058] Comparative Example 1
[0059] (1) Add deionized water to a reactor, stir and sequentially add 3 g of dimethyldiallylammonium chloride, 2 g of acrylamide, 4 g of acrylonitrile, 5 g of 2-acrylamide-2-methylpropanesulfonic acid and 0.1 g of vinyltriethoxysilane, add sodium hydroxide to adjust the pH to 7 after dissolution, continue to add 0.2 g of azobisisobutyronitrile, react at 60° C. for 5 h, and obtain a drilling fluid loss reducer;
[0060] Performance test: The drilling fluid system was prepared according to the following formula: Drilling fluid formula: 300mL No. 5 white oil + 15g organic soil + 15g primary emulsifier (polyisobutylene succinimide) + 5g secondary emulsifier (stearate) + 10g oil-based drilling fluid fluid loss reducer (the fluid loss reducer prepared by Examples 1-6 and Comparative Example 1) + 10g CaO + 40mL CaCl2 (20% aqueous solution) + 660g weighting agent (barite powder). The apparent viscosity (Ay) and plastic viscosity (PV) of the drilling fluid system were tested, and the test results are shown in Table 1.
[0061] Table 1
[0062]
[0063] As can be seen from Table 1, the apparent viscosity and plastic viscosity of Examples 1-5 are basically unchanged compared with Comparative Example 1, indicating that the rate loss reducing agent of the present invention is better.
[0064] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.
Claims
1. A method for preparing a drilling fluid fluid loss reducer silicone-fluorine resin composite, characterized in that: The preparation method of the silicone fluorine resin is: (1) Dissolve 0.4-0.6 g of chitosan in 0.12-0.15 mol / L dilute hydrochloric acid, and after dissolution, filter to obtain a clear solution, uniformly mix 1.2-2.3 g of ethyl orthosilicate and anhydrous ethanol, slowly add the mixture to the clear solution, stir at 20-25° C. for 10-16 h, then add 0.01-0.03 g of hydrogen fluoride solution, continue stirring for 10-20 min, and then let stand for 10-14 h to obtain chitosan-silica gel; (2) adding deionized water to the chitosan-silica gel for washing once, and then washing with anhydrous ethanol for 2-4 times, each time for 5-6 hours, to obtain a pretreated gel, adding 0.4-0.8g of epichlorohydrin and 0.01-0.02g of perchloric acid to anhydrous ethanol for mixing, and then adding the pretreated gel thereto, standing at room temperature for 10-20 hours, and then washing away the residual epichlorohydrin and perchloric acid with anhydrous ethanol, and continuing to add a mixed solution of 1.2-1.4g of ethylenediamine and anhydrous ethanol, and reacting in a water bath at 40-60°C for 10-12 hours to obtain an amino-modified chitosan-silica gel; (3) adding amino-modified chitosan-silica gel and acrylic acid to N,N-dimethylformamide solvent, stirring to dissolve, slowly adding 4-dimethylaminopyridine dropwise, reacting at 100-150° C. for 2-4 hours, and after the reaction is completed, removing the solvent by vacuum distillation, filtering, washing and drying to obtain an amidated gel; (4) adding dodecafluoroheptyl methacrylate and amidated gel to petroleum ether for dissolution, slowly adding benzoyl peroxide initiator after dissolution is completed, reacting at 60-100° C. for 3-6 hours, removing the solvent by vacuum distillation, filtering, washing and drying to obtain a silicone fluororesin; The preparation method of the drilling fluid fluid loss reducer silicone-fluorine resin composite: S1. Add deionized water to the reactor, stir and add dimethyldiallylammonium chloride, acrylamide, acrylonitrile, 2-acrylamide-2-methylpropanesulfonic acid and silane coupling agent in sequence, add sodium hydroxide to adjust the pH to 7-9 after dissolution, continue to add initiator, react at 60-120° C. for 5-8 hours to obtain a drilling fluid loss reducer; S2, stirring and adding silicone-fluororesin to the drilling fluid filtrate reducer, mixing evenly at 70-120° C., completing the reaction, cooling, and obtaining a drilling fluid filtrate reducer silicone-fluororesin composite; The mass ratio of the silicone-fluororesin to the drilling fluid loss reducer in the S2 is 2.1-2.5:2.2-3.
1.
2. The method for preparing a drilling fluid fluid loss reducer silicone-fluorine resin composite according to claim 1, characterized in that: The mass ratio of amino-modified chitosan-silica gel, acrylic acid and 4-dimethylaminopyridine in (3) is 0.1-0.2:1:0.02-0.
03.
3. The method for preparing a drilling fluid fluid loss reducer silicone-fluorine resin composite according to claim 1, characterized in that: The mass ratio of dodecafluoroheptyl methacrylate, amidated gel and benzoyl peroxide in (4) is 1.2-1.5:1:0.03-0.
05.
4. The method for preparing a drilling fluid fluid loss reducer silicone-fluorine resin composite according to claim 1, characterized in that: The silane coupling agent is any one of vinyl triethoxysilane, 3-aminopropyl triethoxysilane, KH-560, and JH-M9002.
5. The method for preparing a drilling fluid fluid loss reducer silicone-fluorine resin composite according to claim 1, characterized in that: The initiator is azobisisobutyronitrile or azobisisobutyronitrile amidine hydrochloride.