Plugging anti-collapse agent for drilling fluid and preparation method of plugging anti-collapse agent
By preparing a plugging and anti-collapse agent with vermiculite as a rigid core and branched molecular chains as a shell, the problems of poor temperature resistance and poor dispersibility of existing plugging and anti-collapse agents have been solved, achieving excellent filtration loss reduction and wellbore stability under high temperature and high pressure.
Patent Information
- Application Number
- CN202411123327.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2026-03-10
AI Technical Summary
Existing sealing and anti-collapse agents suffer from poor temperature resistance, poor dispersibility, and inadequate sealing effect.
A plugging and anti-collapse agent composed of intercalated modified vermiculite, branched crosslinking agent, emulsifier, etc., is formed by intercalation modification and preparation of branched crosslinking agent to form a structure with vermiculite as rigid core and branched molecular chain as shell, thereby enhancing the plugging effect.
It achieves excellent filtration loss reduction and temperature resistance under high temperature and high pressure conditions, and improves wellbore stability.
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of drilling fluids, and particularly relates to a plugging and anti-collapse agent for drilling fluids and a preparation method thereof. BACKGROUND
[0002] In the drilling process, due to uneven formation pressure, rock fragmentation and other factors, problems such as well wall collapse often occur. These problems not only affect the drilling efficiency, but also bring great safety hazards to oil exploitation. The plugging and anti-collapse agent is an additive specially used for drilling fluids, which mainly functions to improve the quality of mud cake, plug micro-cracks and voids in the formation, form a stable structure, reinforce the well wall and enhance the stability of the well wall. The commonly used plugging and anti-collapse agents at present are mainly polymeric alcohol, emulsified paraffin and modified asphalt, but the polymeric alcohol plugging and anti-collapse agent does not contain solid particles, and it is difficult to effectively plug, the emulsified paraffin plugging and anti-collapse agent has a low softening point and is prone to emulsion breaking at low temperatures, and it is difficult to meet the plugging and anti-collapse requirements, and the modified asphalt can only be combined with rocks in a physical adsorption manner, and it is difficult to achieve long-term plugging. Using high-strength nanomaterials as the plugging and anti-collapse agent can achieve good plugging of pores, but the dispersibility of the nanomaterials is poor, and it is difficult to achieve efficient plugging of pores, therefore, the nanomaterial plugging and anti-collapse agent mostly has the problems of poor temperature resistance, poor plugging effect and poor dispersibility. SUMMARY
[0003] In order to solve the problems of poor temperature resistance, poor dispersibility and poor plugging effect of the plugging and anti-collapse agent, a high-temperature-resistant functional plugging and anti-collapse agent for drilling fluids is prepared, which is prepared from the following raw materials in parts by weight: intercalation modified vermiculite 1-2 parts, N-vinylpyrrolidone 10-15 parts, acrylamide 25-35 parts, branched crosslinking agent 2-4 parts, white oil 3-5 parts, emulsifier 0.5-1 part, sulfite 0.2-0.4 part, persulfate 0.1-0.3 part, and purified water 50-70 parts.
[0004] The intercalation modified vermiculite is preferably 1.3-1.7 parts, the N-vinylpyrrolidone is preferably 12-14 parts, the acrylamide is preferably 28-32 parts, the branched crosslinking agent is preferably 2.5-3.5 parts, the white oil is preferably 3.5-4.5 parts, the emulsifier is preferably 0.7-0.9 parts, the sulfite is preferably 0.25-0.35 parts, the persulfate is preferably 0.15-0.25 parts, and the water is preferably 55-65 parts.
[0005] The branched crosslinking agent is an unsaturated alkenyl derivative containing quaternary ammonium cations and sulfonic acid groups in the structure.
[0006] The intercalation modified vermiculite is prepared by the following method:
[0007] Step S1, acid treatment of vermiculite
[0008] The nano vermiculite powder is mixed with a sulfuric acid solution with a concentration of 2-3 mol / L, and is continuously stirred at a stirring rate of 500-600 r / min for 3-6 h at a temperature of 70-80℃, and then is cooled and discharged, washed to neutral, and vacuum dried to obtain the acidified vermiculite.
[0009] Specifically, the nano vermiculite powder contains a large amount of impurities, and the impurities can be dissolved by using sulfuric acid, so that the interlayer structure of the nano vermiculite powder can be fully exposed to form the acidified vermiculite.
[0010] Step S2, intercalation modification of vermiculite
[0011] The intercalation reagent is uniformly mixed with purified water to prepare an intercalation modification liquid, and the acidified vermiculite is then added into the intercalation modification liquid, the temperature is controlled at 70-75℃, the ultrasonic power is set at 300-400 W, and the solid particles are separated after being continuously ultrasonically treated for 2-4 h, to obtain the intercalation modified vermiculite.
[0012] The intercalation reagent is used to intercalate and modify the acidified vermiculite, and the ultrasonic radiation is used to improve the hydration effect of the vermiculite, so that the intercalation reagent can enter the interlayer of the vermiculite, and the intercalation modified vermiculite is prepared.
[0013] Further, in step S2, the intercalation reagent is any one of diallylamine, 1,6-heptadiene-4-ol, 2-acrylic acid-2-hydroxy-1,3-propanediol, or glycerol dimethacrylate.
[0014] Further, in step S2, the mass fraction of the intercalation modification liquid is 15-25%.
[0015] The branched crosslinking agent is prepared by the following method:
[0016] Step SS1, preparation of branched crosslinking agent precursor
[0017] Extr-3,6-epoxy-1,2,3,6-tetrahydrophthalic anhydride and tetrahydrofuran are added into a polymerization kettle, and are uniformly mixed under stirring in a nitrogen atmosphere. Under ice bath conditions, 2,3-dihydroxypropyl-trimethylammonium chloride is continuously added into the kettle. After addition is completed, mechanical stirring is performed until dissolution, and then the ice bath is removed. The mixture is stirred at room temperature for 1-2 h, and then a catalyst is added. After addition is completed, stirring is continued for 6-9 h, and then the solvent is evaporated and removed to obtain the branched crosslinking agent precursor.
[0018] Specifically, the 2,3-dihydroxypropyl-trimethylammonium chloride structure contains two equivalent substituted hydroxyl groups, which can undergo ring-opening esterification with the anhydride groups in the exo-3,6-epoxy-1,2,3,6-tetrahydrophthalic anhydride structure, while generating new carboxyl functional groups. Under the action of a catalyst, these active carboxyl groups can further undergo esterification condensation with unreacted 2,3-dihydroxypropyl-trimethylammonium chloride, thereby forming a polyester-type branched crosslinker precursor with a continuous structure connected at the head and tail.
[0019] Step SS2, preparation of the branched crosslinker
[0020] The branched crosslinker precursor, the sulfonating modifier, and toluene are sequentially added to a polymerization kettle, nitrogen is filled as a protective gas, and after stirring is uniform, heating is started. After the temperature rises to 60-70℃, the stirring is maintained for 2-4h, and then the solvent is evaporated and removed, and the temperature is lowered to discharge, thereby obtaining the branched crosslinker.
[0021] Since the raw material exo-3,6-epoxy-1,2,3,6-tetrahydrophthalic anhydride for making the branched crosslinker precursor also contains an epoxy substituent, it can undergo ring-opening with the amine group in the sulfonating modifier structure, thereby introducing a large number of sulfonic acid groups, and an unsaturated alkenyl derivative containing quaternary ammonium cations and sulfonic acid groups, i.e. the branched crosslinker, is prepared.
[0022] Further, in step SS1, the molar ratio of the exo-3,6-epoxy-1,2,3,6-tetrahydrophthalic anhydride and the 2,3-dihydroxypropyl-trimethylammonium chloride is 1:1-1.2.
[0023] Further, in step SS2, the sulfonating modifier is a reagent used for the purpose of introducing sulfonic acid groups, and is selected from any one of amine ethanesulfonic acid, 3-amino-1-propanesulfonic acid, or p-aminobenzenesulfonic acid. Other substances known in the art as such reagents can also be used.
[0024] Further, in step SS2, the catalyst is a complex of dicyclohexyl carbodiimide and 4-dimethylamino pyridine, with a mass ratio of 1:0.2-0.3.
[0025] Further, the emulsifier is any one of Span 80, Span 60, propylene glycol fatty acid ester, or diethylene glycol monooleate; the sulfite is any one of sodium bisulfite, sodium sulfite, or sodium metabisulfite; and the persulfate is any one of ammonium persulfate, potassium persulfate, or sodium persulfate. DETAILED DESCRIPTION
[0026] Example 1:
[0027] Preparation of intercalation modified vermiculite.
[0028] Step S1, acid treatment of vermiculite
[0029] 5 g of nanometer vermiculite powder was mixed with 80 mL of sulfuric acid solution with a concentration of 2 mol / L, and placed in a temperature of 75°C. After stirring at a stirring rate of 500 r / min for 4 h, the temperature was lowered and the product was discharged, washed to neutral, and then vacuum dried to obtain acidified vermiculite;
[0030] Step S2, intercalation modification of vermiculite
[0031] 3.5 g of diallylamine was mixed with purified water to prepare an intercalation modification solution with a mass fraction of 20%, and then 2 g of acidified vermiculite was added to the intercalation modification solution. The temperature was controlled at 70°C, and the ultrasonic power was set at 300 W. After maintaining under continuous ultrasonic conditions for 3 h, the temperature was lowered and the solid particles were separated to obtain intercalation modified vermiculite.
[0032] 1 g of intercalation modified vermiculite was weighed, and a CHN628 type elemental analyzer was used to analyze the organic element content of the intercalation modified vermiculite. The carbon element content was 12.14%, and the nitrogen element content was 2.90%. It was clear that the vermiculite did not contain these organic elements, so the organic elements were derived from diallylamine.
[0033] Example 2:
[0034] A branched crosslinking agent was prepared.
[0035] Step S1, preparation of branched crosslinking agent precursor
[0036] 1.8 g of exo-3,6-epoxy-1,2,3,6-tetrahydrophthalic anhydride and tetrahydrofuran were added to a polymerization kettle and stirred uniformly in a nitrogen atmosphere. Under ice bath conditions, 2 g of 2,3-dihydroxypropyl-trimethylammonium chloride was added to the kettle. After adding, the ice bath was removed and the mixture was stirred at room temperature for 2 h. Then, 0.8 g of dicyclohexyl carbodiimide and 0.2 g of 4-dimethylamino pyridine were added. After stirring for 8 h, the solvent was evaporated to obtain a branched crosslinking agent precursor.
[0037] Step SS2, preparation of branched crosslinking agent
[0038] 1.5 g of branched crosslinking agent precursor, 0.2 g of p-aminobenzenesulfonic acid, and toluene were sequentially added to a polymerization kettle, and nitrogen was filled as a protective gas. After stirring uniformly, heating was started. When the temperature rose to 65°C, the stirring was maintained for 3 h. Then, the solvent was evaporated, the temperature was lowered, and the product was discharged to obtain a branched crosslinking agent.
[0039] Example 3:
[0040] A high-temperature-resistant functional plugging anti-sloughing agent for drilling fluid is prepared from the following raw materials by weight: 1 part of intercalation modified vermiculite prepared in Example 1, 10 parts of N-vinylpyrrolidone, 25 parts of acrylamide, 2 parts of branched crosslinking agent prepared in Example 2, 3 parts of 5# white oil, 0.5 part of emulsifier Span 80, 0.2 part of sodium bisulfite, 0.1 part of ammonium persulfate, and 50 parts of purified water; and the preparation method of the plugging anti-sloughing agent is as follows:
[0041] First step, preparing oil phase
[0042] The emulsifier is added to the 5# white oil, and mixed at a stirring speed of 100 r / min, so that the emulsifier Span 80 is completely dissolved to form the oil phase;
[0043] Second step, preparing water phase
[0044] The intercalation modified vermiculite prepared in Example 1 is added to the purified water, and ultrasonically treated to form a uniform dispersion liquid, and then the N-vinylpyrrolidone, acrylamide, branched crosslinking agent prepared in Example 2, and sodium bisulfite are continuously added under constant stirring, and after completion of the addition, mechanical stirring is performed for dissolution to form the water phase;
[0045] Third step, preparing plugging anti-sloughing agent
[0046] The oil phase is added dropwise to the water phase under nitrogen protection, and after completion of the dropwise addition, emulsification is performed at room temperature for 20 min, and then the temperature is increased to 60℃, and ammonium persulfate is continuously added, and after polymerization for 6 h, the temperature is decreased to discharge the product, thereby obtaining the plugging anti-sloughing agent.
[0047] Example 4
[0048] A high-temperature-resistant functional plugging anti-sloughing agent for drilling fluid is prepared from the following raw materials by weight: 1.5 parts of intercalation modified vermiculite prepared in Example 1, 12 parts of N-vinylpyrrolidone, 30 parts of acrylamide, 3.5 parts of branched crosslinking agent prepared in Example 2, 4 parts of 5# white oil, 0.8 part of emulsifier Span 80, 0.3 part of sodium bisulfite, 0.2 part of potassium persulfate, and 60 parts of purified water; and the preparation method of the plugging anti-sloughing agent is as follows:
[0049] First step, preparing oil phase
[0050] The emulsifier is added to the 5# white oil, and mixed at a stirring speed of 150 r / min, so that the emulsifier Span 80 is completely dissolved to form the oil phase;
[0051] Second step, preparing water phase
[0052] The intercalation modified vermiculite prepared in Example 1 is added to purified water, ultrasonic treatment is performed to form a uniform dispersion liquid, and under continuous stirring, N-vinylpyrrolidone, acrylamide, the branched crosslinking agent prepared in Example 2, and sodium bisulfite are continuously added, mechanical stirring is performed for dissolution, and a water phase is formed;
[0053] Step 3, preparation of the plugging anti-sloughing agent
[0054] Under nitrogen protection, the oil phase is added dropwise into the water phase, after the dropwise addition is completed, emulsification is performed at room temperature for 30 min, the temperature is then increased to 65℃, potassium persulfate is continuously added, and polymerization is performed for 5 h, then the temperature is decreased to discharge the product, and the plugging anti-sloughing agent is obtained.
[0055] Example 5:
[0056] A high-temperature resistant functional plugging anti-sloughing agent for drilling fluid is prepared from the following raw materials by weight: the intercalation modified vermiculite prepared in Example 1 2 parts, N-vinylpyrrolidone 15 parts, acrylamide 35 parts, the branched crosslinking agent prepared in Example 2 4 parts, 5# white oil 5 parts, emulsifier Span 80 1 part, sodium bisulfite 0.4 part, ammonium persulfate 0.3 part, and purified water 70 parts;
[0057] The preparation method of the plugging anti-sloughing agent is as follows:
[0058] Step 1, preparation of the oil phase
[0059] The emulsifier is added to the 5# white oil, stirring is performed at a stirring speed of 200 r / min to dissolve the emulsifier Span 80 completely, and the oil phase is formed.
[0060] Step 2, preparation of the water phase
[0061] The intercalation modified vermiculite prepared in Example 1 is added to purified water, ultrasonic treatment is performed to form a uniform dispersion liquid, and under continuous stirring, N-vinylpyrrolidone, acrylamide, the branched crosslinking agent prepared in Example 2, and sodium bisulfite are continuously added, mechanical stirring is performed for dissolution, and a water phase is formed.
[0062] Step 3, preparation of the plugging anti-sloughing agent
[0063] Under nitrogen protection, the oil phase is added dropwise into the water phase, after the dropwise addition is completed, emulsification is performed at room temperature for 40 min, the temperature is then increased to 70℃, ammonium persulfate is continuously added, and polymerization is performed for 4 h, then the temperature is decreased to discharge the product, and the plugging anti-sloughing agent is obtained.
[0064] Comparative Example 1:
[0065] A plugging anti-sloughing agent is prepared from the following raw materials by weight: 1.5 parts of the intercalation modified vermiculite prepared in Example 1, 12 parts of N-vinyl pyrrolidone, 30 parts of acrylamide, 4 parts of 5# white oil, 0.8 parts of emulsifier Span 80, 0.3 parts of sodium bisulfite, 0.2 parts of potassium persulfate, and 60 parts of purified water. The preparation method of the plugging anti-sloughing agent is as follows:
[0066] First step, preparing oil phase
[0067] The emulsifier is added to the 5# white oil, and mixed at a stirring speed of 150 r / min to dissolve the emulsifier Span 80 completely, thereby forming the oil phase.
[0068] Second step, preparing water phase
[0069] The intercalation modified vermiculite prepared in Example 1 is added to the purified water, and ultrasonically treated to form a uniform dispersion liquid. Then, N-vinyl pyrrolidone, acrylamide and sodium bisulfite are continuously added under constant stirring, and after completion of the addition, mechanical stirring is performed to dissolve, thereby forming the water phase.
[0070] Third step, preparing plugging anti-sloughing agent
[0071] The oil phase is added dropwise to the water phase under nitrogen protection. After completion of the dropwise addition, the emulsion is allowed to stand at room temperature for 30 min, and then the temperature is increased to 65℃. Potassium persulfate is continuously added, and after polymerization for 5 h, the temperature is decreased to discharge the product, thereby obtaining the plugging anti-sloughing agent.
[0072] Comparative Example 2
[0073] A plugging anti-sloughing agent is prepared from the following raw materials by weight: 12 parts of N-vinyl pyrrolidone, 30 parts of acrylamide, 3.5 parts of the branched crosslinking agent prepared in Example 2, 4 parts of 5# white oil, 0.8 parts of emulsifier Span 80, 0.3 parts of sodium bisulfite, 0.2 parts of potassium persulfate, and 60 parts of purified water. The preparation method of the plugging anti-sloughing agent is as follows:
[0074] First step, preparing oil phase
[0075] The emulsifier is added to the 5# white oil, and mixed at a stirring speed of 150 r / min to dissolve the emulsifier Span 80 completely, thereby forming the oil phase.
[0076] Second step, preparing water phase
[0077] N-vinyl pyrrolidone, acrylamide, the branched crosslinking agent prepared in Example 2 and sodium bisulfite are added to the purified water, and after completion of the addition, mechanical stirring is performed to dissolve, thereby forming the water phase.
[0078] Third step, preparing plugging anti-sloughing agent
[0079] The oil phase was added dropwise into the water phase under nitrogen protection, after the dropwise addition was completed, emulsification was carried out at room temperature for 30 min, then the temperature was increased to 65 DEG C, potassium persulfate was continuously added, and polymerization was carried out for 5 h, then the temperature was decreased to discharge, and the plugging anti-collapse agent was obtained.
[0080] Experimental example 1:
[0081] The following is the indoor evaluation test of the plugging agent of the application.
[0082] The fresh water base slurry was prepared by adding 2.5 g of anhydrous sodium carbonate into 1000 mL of deionized water, stirring until completely dissolved, then adding 48 g of drilling fluid bentonite at a stirring rate of 12000 r / min, and after completion of the addition, continuing to stir for 30 min, and then curing at a temperature of 25 DEG C for 24 h to form the fresh water base slurry.
[0083] The fresh water base slurry was divided into 5 parts, and 6 g of the plugging anti-collapse agent prepared by the application examples 3-5 and the comparative examples 1 and 2 was added into the fresh water base slurry at a stirring rate of 12000 r / min, respectively, and after completion of the addition, hot rolling aging was carried out at a temperature of 180 DEG C for 16 h, and then it was naturally cooled, and the filtration loss test was carried out according to the standard GB / T16783.1-2014, and the results are shown in the following table:
[0084] Table 1: Filtration loss test results Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Low temperature, low pressure filtration loss (mL) 5 4 5 12 9 High temperature, high pressure filtration loss (mL) 26 23 24 39 44
[0085] According to the analysis of the test data in the table, the plugging anti-collapse agent with vermiculite as the rigid inner core and branched molecular chain as the outer shell has obviously more excellent filtration loss reduction effect and temperature resistance. On the contrary, the plugging anti-collapse agent prepared by the comparative example 1 cannot effectively adsorb and wrap the clay due to the absence of branched molecular chain, and cannot effectively play the bridging role of the rigid inner core, so the filtration loss reduction performance is general, and the filtration loss reduction performance under high temperature and high pressure is even worse. The plugging anti-collapse agent prepared by the comparative example 2 does not contain a rigid inner core, although it can exhibit a certain filtration loss reduction effect under low temperature and low pressure conditions, but the pressure bearing effect is poor, so the filtration loss reduction effect under high temperature and high pressure conditions is extremely poor.
Claims
1. A plugging anti-sloughing agent for drilling fluid, characterized in that, The intercalation modified vermiculite is 1-2 parts, N-vinyl pyrrolidone is 10-15 parts, acrylamide is 25-35 parts, branched crosslinking agent is 2-4 parts, white oil is 3-5 parts, emulsifier is 0.5-1.0 parts, sulfite is 0.2-0.4 parts, persulfate is 0.1-0.3 parts, and water is 50-70 parts by weight.
2. The plugging anti-sloughing agent for drilling fluid according to claim 1, characterized in that, The intercalation modified vermiculite is preferably 1.3-1.7 parts, N-vinyl pyrrolidone is preferably 12-14 parts, acrylamide is preferably 28-32 parts, branched crosslinking agent is preferably 2.5-3.5 parts, white oil is preferably 3.5-4.5 parts, emulsifier is preferably 0.7-0.9 parts, sulfite is preferably 0.25-0.35 parts, persulfate is preferably 0.15-0.25 parts, and water is preferably 55-65 parts by weight.
3. The plugging anti-sloughing agent for drilling fluid according to claim 1 or 2, characterized in that, The preparation method of the branched crosslinking agent comprises the following steps: SS1: uniformly mix exo-3,6-epoxy-1,2,3,6-tetrahydrophthalic anhydride and tetrahydrofuran in an inert gas atmosphere, add 2,3-dihydroxypropyl-trimethylammonium chloride into the kettle for dissolution, add a catalyst for reaction, remove the solvent, and obtain a branched crosslinking agent precursor; SS2: uniformly mix the branched crosslinking agent precursor, a sulfonated modifier, and toluene in an inert gas atmosphere for reaction, remove the solvent, and obtain a branched crosslinking agent.
4. The anti-sloughing plug according to claim 3, wherein, The molar ratio of the SS1 exo-3,6-epoxy-1,2,3,6-tetrahydrophthalic anhydride to 2,3-dihydroxypropyl-trimethylammonium chloride is 1:1-1.
2.
5. The plugging anti-sloughing agent according to claim 3 or 4, characterized in that, The SS1 catalyst is a complex of dicyclohexyl carbodiimide and 4-dimethylamino pyridine, and the mass ratio is 1:0.2-0.
3.
6. The plugging anti-sloughing agent according to claim 3 or 4, characterized in that, The SS2 sulfonated modifier is any one of amine ethanesulfonic acid, 3-amino-1-propanesulfonic acid, and p-aminobenzenesulfonic acid.
7. The plugging anti-sloughing agent for drilling fluid according to claim 1 or 2, characterized in that, The emulsifier is any one of Span 80, Span 60, propylene glycol fatty acid ester, and diethylene glycol monooleate.
8. The plugging anti-sloughing agent for drilling fluid according to claim 1 or 2, characterized in that, The sulfite is any one of sodium bisulfite, sodium sulfite, and sodium metabisulfite.
9. The plugging anti-sloughing agent for drilling fluid according to claim 1 or 2, characterized in that, The persulfate is any one of ammonium persulfate, sodium persulfate, and potassium persulfate.
10. The method for preparing the plugging and anti-sloughing agent for drilling fluid according to any one of claims 1-9, characterized in that, The method comprises the following steps: S1: add an emulsifier into white oil to dissolve and form an oil phase; S2: uniformly disperse intercalation modified vermiculite in water, add N-vinyl pyrrolidone, acrylamide, branched crosslinking agent, and sulfite to dissolve and form an aqueous phase; S3: under the protection of an inert gas, drop the oil phase into the aqueous phase, emulsify, add persulfate for polymerization, and obtain a plugging and anti-collapse agent.
11. The method for preparing the plugging anti-sloughing agent for drilling fluid according to claim 10, characterized in that, The preparation method of the intercalation modified vermiculite in the S2 comprises the following steps: SS1: mix nano vermiculite powder with a sulfuric acid solution for reaction, wash to neutral after reaction, and obtain acidified vermiculite; 12. The method of preparing a plugging anti-sloughing agent for drilling fluid according to claim 10 or 11, characterized in that, SS2: configure an intercalation modifier into an intercalation modification liquid, put the acidified vermiculite into the intercalation modification liquid for reaction, separate solid particles, and obtain intercalation modified vermiculite.
13. The method of preparing a plugging anti-sloughing agent for drilling fluid according to claim 10 or 11, characterized in that, The SS2 intercalation modifier is any one of diallylamine, 1,6-heptadiene-4-ol, 2-propenoic acid-2-hydroxy-1,3-propanediol, and dimethyl glyceryl acrylate. The mass fraction of the SS2 intercalation modification liquid is 15-25%.