Manufacturing method and application of drilling mud material

Abstract

The invention relates to a manufacturing method of a drilling mud material. The method comprises the following steps: weighing the following raw materials in parts by weight: 45-50 parts of G-grade oil well cement, 5-8 parts of modified silicon powder, 4-7 parts of a fiber filler, 20-25 parts of water and 3-5 parts of fly ash; the raw materials are uniformly and sufficiently mixed to obtain the drilling mud material. According to the drilling mud material disclosed by the invention, the G-grade oil well cement, the fly ash, the modified silicon powder and the fiber filler are matched, and the raw materials are blended, coordinated and optimized together, so that the 24-hour strength, fluidity and water resistance of the prepared drilling mud material can be harmoniously improved.

Description

Technical Field

[0001] This invention relates to the field of drilling mud technology, specifically to a method for preparing drilling mud materials and their applications. Background Technology

[0002] Drilling mud, also known as drilling fluid, is a circulating fluid used in the drilling process to meet various functional requirements. It acts like the "blood" of drilling operations, undertaking several crucial tasks. For example, mud effectively cools and lubricates the drill bit, helping to reduce wear and extend its service life, while also reducing energy consumption and improving drilling efficiency. It also carries cuttings back to the surface, ensuring a clean borehole and preventing cuttings buildup that could hinder drilling. Existing drilling mud materials suffer from poor strength; optimizing 24-hour strength often reduces the product's flowability, and its poor water resistance limits its efficiency. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the purpose of this invention is to provide a method for preparing drilling mud materials and their application, so as to solve the problems mentioned in the background art.

[0004] The present invention solves the technical problem by adopting the following technical solution: This invention provides a method for preparing drilling mud material, comprising the following steps: Step 1: Weigh the raw materials according to the specified weight proportions: 45-50 parts of Grade G oil well cement, 5-8 parts of modified silica fume, 4-7 parts of fiber filler, 20-25 parts of water, and 3-5 parts of fly ash; Step 2: Mix the above raw materials thoroughly to obtain drilling mud material.

[0005] Preferably, the modified silicon powder is prepared by: S01: Preheat silicon powder at 55-60℃ for 1 hour to obtain preheated silicon powder. Add the preheated silicon powder to a sodium dodecylbenzenesulfonate solution with a volume of 5-8 times the total volume of the preheated silicon powder and stir evenly to obtain silicon powder liquid. S02: Add 20-25% of the total weight of the silicon powder liquid to the silicon powder liquid, ball mill at a speed of 1000-1500 r / min for 2 hours, filter and dry to obtain modified silicon powder.

[0006] Preferably, the sodium dodecylbenzenesulfonate solution has a mass fraction of 5-8%.

[0007] Preferably, the additive is prepared by: S11: Mix silane coupling agent KH560, ethanol and water in a weight ratio of (3-5):7:5 to obtain a silane solution; mix 3-5 parts of nanocellulose, 2-3 parts of lanthanum oxide and 5-8 parts of silane solution to obtain a nanocellulose solution. S12: Mix 4-6 parts of calcium sulfate whiskers, 2-3 parts of silicon carbide and 5-8 parts of dopamine hydrochloride solution evenly to obtain whisker solution; Add 20-25% of the total amount of nanocellulose solution to the whisker solution and ball mill. After ball milling, filter and dry to obtain the additive.

[0008] Preferably, the mass fraction of the dopamine hydrochloride solution is 4-7%; the ball milling speed is 1200-1500 r / min, and the ball milling time is 2 h.

[0009] Preferably, the fiber filler is prepared by: S101: Stir the glass fiber in a sufficient amount of potassium permanganate solution, then wash with water, filter and dry. Preheat the dried glass fiber at 55-60℃ for 1 hour to obtain preheated glass fiber. Add 2-4 parts boron nitride and 3-5 parts kaolin to 5-8 parts sodium lignosulfonate solution, then add 2-3 parts phosphate buffer solution, stir well to obtain filling solution; S102: The preheated glass fiber and the filling liquid are mixed at a weight ratio of 5:3 and ball-milled. After ball milling, the ball milling speed is 1000-1500 r / min and the ball milling time is 2h. The mixture is then filtered and dried to obtain the fiber filler.

[0010] Preferably, the sodium lignosulfonate solution has a mass fraction of 5-8%; and the phosphate buffer solution has a pH value of 5.0-6.0. Preferably, the potassium permanganate solution has a mass fraction of 10-15%.

[0011] This invention also provides a method for preparing drilling mud materials and its application in oil well drilling.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The drilling mud material of this invention uses G-grade oil well cement, fly ash, modified silica fume, and fiber filler. Through the blending and synergistic combination of raw materials, the strength, fluidity, and water resistance of the resulting drilling mud material can be synergistically improved after 24 hours. The modified silica fume is made by blending silica fume with sodium dodecylbenzene sulfonate solution and then ball milling it with additives. The whisker liquid and nanocellulose liquid in the additives are ball milled and optimized, and then combined with fiber filler for synergistic effect. The preheated glass fiber and filler liquid in the fiber filler are mutually blended and reinforced. Through the co-blending and improvement of raw materials, the performance of the resulting product can be further improved. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] This embodiment of a drilling mud material preparation method includes the following steps: Step 1: Weigh the raw materials according to the specified weight proportions: 45-50 parts of Grade G oil well cement, 5-8 parts of modified silica fume, 4-7 parts of fiber filler, 20-25 parts of water, and 3-5 parts of fly ash; Step 2: Mix the above raw materials thoroughly to obtain drilling mud material.

[0015] The method for preparing the modified silicon powder in this embodiment is as follows: S01: Preheat silicon powder at 55-60℃ for 1 hour to obtain preheated silicon powder. Add the preheated silicon powder to a sodium dodecylbenzenesulfonate solution with a volume of 5-8 times the total volume of the preheated silicon powder and stir evenly to obtain silicon powder liquid. S02: Add 20-25% of the total weight of the silicon powder liquid to the silicon powder liquid, ball mill at a speed of 1000-1500 r / min for 2 hours, filter and dry to obtain modified silicon powder.

[0016] The sodium dodecylbenzenesulfonate solution in this embodiment has a mass fraction of 5-8%.

[0017] The preparation method of the additive in this embodiment is as follows: S11: Mix silane coupling agent KH560, ethanol and water in a weight ratio of (3-5):7:5 to obtain a silane solution; mix 3-5 parts of nanocellulose, 2-3 parts of lanthanum oxide and 5-8 parts of silane solution to obtain a nanocellulose solution. S12: Mix 4-6 parts of calcium sulfate whiskers, 2-3 parts of silicon carbide and 5-8 parts of dopamine hydrochloride solution evenly to obtain whisker solution; Add 20-25% of the total amount of nanocellulose solution to the whisker solution and ball mill. After ball milling, filter and dry to obtain the additive.

[0018] In this embodiment, the mass fraction of the hydrochloric acid dopamine solution is 4-7%; the ball milling speed is 1200-1500 r / min, and the ball milling time is 2 h.

[0019] The preparation method of the fiber filler in this embodiment is as follows: S101: Stir the glass fiber in a sufficient amount of potassium permanganate solution, then wash with water, filter and dry. Preheat the dried glass fiber at 55-60℃ for 1 hour to obtain preheated glass fiber. Add 2-4 parts boron nitride and 3-5 parts kaolin to 5-8 parts sodium lignosulfonate solution, then add 2-3 parts phosphate buffer solution, stir well to obtain filling solution; S102: The preheated glass fiber and the filling liquid are mixed at a weight ratio of 5:3 and ball-milled. After ball milling, the ball milling speed is 1000-1500 r / min and the ball milling time is 2h. The mixture is then filtered and dried to obtain the fiber filler.

[0020] In this embodiment, the sodium lignosulfonate solution has a mass fraction of 5-8%; the phosphate buffer solution has a pH value of 5.0-6.0. The mass fraction of the potassium permanganate solution in this embodiment is 10-15%.

[0021] This embodiment describes the application of a method for preparing drilling mud material in oil well drilling.

[0022] Example 1. This embodiment of a drilling mud material preparation method includes the following steps: Step 1: Weigh the raw materials according to the specified weight proportions: 45 parts of Grade G oil well cement, 5 parts of modified silica fume, 4 parts of fiber filler, 20 parts of water, and 3 parts of fly ash; Step 2: Mix the above raw materials thoroughly to obtain drilling mud material.

[0023] The method for preparing the modified silicon powder in this embodiment is as follows: S01: Preheat silicon powder at 55°C for 1 hour to obtain preheated silicon powder. Add the preheated silicon powder to a sodium dodecylbenzenesulfonate solution with a volume of 5 times the total amount of preheated silicon powder and stir until homogeneous to obtain silicon powder liquid. S02: Add 20% of the total weight of the silicon powder liquid as additive to the silicon powder liquid, ball mill at a speed of 1000 r / min for 2 hours, filter and dry to obtain modified silicon powder.

[0024] The sodium dodecylbenzenesulfonate solution in this embodiment has a mass fraction of 5%.

[0025] The preparation method of the additive in this embodiment is as follows: S11: Mix silane coupling agent KH560, ethanol and water in a weight ratio of 3:7:5 to obtain a silane solution; mix 3 parts of nanocellulose, 2 parts of lanthanum oxide and 5 parts of silane solution to obtain a nanocellulose solution. S12: Mix 4 parts calcium sulfate whiskers, 2 parts silicon carbide and 5 parts dopamine hydrochloride solution evenly to obtain whisker solution; The nanocellulose solution, which is 20% of the total amount of whisker solution, was added to the whisker solution and ball-milled. After ball milling, the mixture was filtered and dried to obtain the additive.

[0026] In this embodiment, the mass fraction of the hydrochloric acid dopamine solution is 4%; the ball milling speed is 1200 r / min, and the ball milling time is 2 h.

[0027] The preparation method of the fiber filler in this embodiment is as follows: S101: Stir the glass fiber in a sufficient amount of potassium permanganate solution, then wash with water, filter and dry. Preheat the dried glass fiber at 55°C for 1 hour to obtain preheated glass fiber. Add 2 parts boron nitride and 3 parts kaolin to 5 parts sodium lignosulfonate solution, then add 2 parts phosphate buffer solution, stir well to obtain filling solution; S102: The preheated glass fiber and filling liquid are mixed at a weight ratio of 5:3 and ball-milled. After ball milling, the ball milling speed is 1000 r / min and the ball milling time is 2h. The mixture is then filtered and dried to obtain the fiber filler.

[0028] In this embodiment, the sodium lignosulfonate solution has a mass fraction of 5%; the phosphate buffer solution has a pH of 5.0. The potassium permanganate solution in this embodiment has a mass fraction of 10%.

[0029] This embodiment describes the application of a method for preparing drilling mud material in oil well drilling.

[0030] Example 2. This embodiment of a drilling mud material preparation method includes the following steps: Step 1: Weigh the raw materials according to the specified weight proportions: 50 parts of Grade G oil well cement, 8 parts of modified silica fume, 7 parts of fiber filler, 25 parts of water, and 3-5 parts of fly ash; Step 2: Mix the above raw materials thoroughly to obtain drilling mud material.

[0031] The method for preparing the modified silicon powder in this embodiment is as follows: S01: Preheat silicon powder at 60°C for 1 hour to obtain preheated silicon powder. Add the preheated silicon powder to a sodium dodecylbenzenesulfonate solution with a volume of 8 times the total volume of the preheated silicon powder and stir until homogeneous to obtain silicon powder liquid. S02: Add 25% of the total weight of the silicon powder liquid to the silicon powder liquid as an additive, ball mill at a speed of 1500 r / min for 2 hours, filter and dry to obtain modified silicon powder.

[0032] The sodium dodecylbenzenesulfonate solution in this embodiment has a mass fraction of 8%.

[0033] The preparation method of the additive in this embodiment is as follows: S11: Mix silane coupling agent KH560, ethanol and water in a weight ratio of 5:7:5 to obtain a silane solution; mix 5 parts of nanocellulose, 3 parts of lanthanum oxide and 8 parts of silane solution to obtain a nanocellulose solution. S12: Mix 6 parts calcium sulfate whiskers, 3 parts silicon carbide and 8 parts dopamine hydrochloride solution evenly to obtain whisker solution; The nanocellulose solution, which is 25% of the total amount of whisker solution, was added to the whisker solution and ball-milled. After ball milling, the mixture was filtered and dried to obtain the additive.

[0034] In this embodiment, the mass fraction of the hydrochloric acid dopamine solution is 7%; the ball milling speed is 1500 r / min, and the ball milling time is 2 h.

[0035] The preparation method of the fiber filler in this embodiment is as follows: S101: Stir the glass fiber in a sufficient amount of potassium permanganate solution, then wash with water, filter and dry. Preheat the dried glass fiber at 60°C for 1 hour to obtain preheated glass fiber. Add 4 parts boron nitride and 5 parts kaolin to 8 parts sodium lignosulfonate solution, then add 3 parts phosphate buffer solution, stir well to obtain filling solution; S102: The preheated glass fiber and filling liquid are mixed at a weight ratio of 5:3 and ball-milled. After ball milling, the ball milling speed is 1500 r / min and the ball milling time is 2h. The mixture is then filtered and dried to obtain the fiber filler.

[0036] In this embodiment, the sodium lignosulfonate solution has a mass fraction of 8%; the phosphate buffer solution has a pH of 6.0. The potassium permanganate solution in this embodiment has a mass fraction of 15%.

[0037] This embodiment describes the application of a method for preparing drilling mud material in oil well drilling.

[0038] Example 3. This embodiment of a drilling mud material preparation method includes the following steps: Step 1: Weigh the raw materials according to the specified weight proportions: 47.5 parts Grade G oil well cement, 6.5 parts modified silica fume, 5.5 parts fiber filler, 22.5 parts water, and 4 parts fly ash; Step 2: Mix the above raw materials thoroughly to obtain drilling mud material.

[0039] The method for preparing the modified silicon powder in this embodiment is as follows: S01: Preheat silicon powder at 57°C for 1 hour to obtain preheated silicon powder. Add the preheated silicon powder to a sodium dodecylbenzenesulfonate solution with a volume of 6.5 times the total volume of the preheated silicon powder and stir until homogeneous to obtain silicon powder liquid. S02: Add 22.5% of the total weight of the silicon powder liquid as an additive to the silicon powder liquid, ball mill at a speed of 1250 r / min for 2 hours, filter and dry to obtain modified silicon powder.

[0040] The sodium dodecylbenzenesulfonate solution in this embodiment has a mass fraction of 6.5%.

[0041] The preparation method of the additive in this embodiment is as follows: S11: Silane coupling agent KH560, ethanol and water are mixed evenly in a weight ratio of 4:7:5 to obtain a silane solution; 4 parts of nanocellulose, 2.5 parts of lanthanum oxide and 6.5 parts of silane solution are mixed evenly to obtain a nanocellulose solution; S12: Mix 5 parts calcium sulfate whiskers, 2.5 parts silicon carbide and 6.5 parts dopamine hydrochloride solution evenly to obtain whisker solution; The mixture was ball-milled with 22.5% of the total amount of nanocellulose solution added to the whisker solution. After ball milling, the mixture was filtered and dried to obtain the additive.

[0042] In this embodiment, the mass fraction of the hydrochloric acid dopamine solution was 5.5%; the ball milling speed was 1350 r / min, and the ball milling time was 2 h.

[0043] The preparation method of the fiber filler in this embodiment is as follows: S101: Stir the glass fiber in a sufficient amount of potassium permanganate solution, then wash with water, filter and dry. Preheat the dried glass fiber at 57°C for 1 hour to obtain preheated glass fiber. Add 3 parts boron nitride and 4 parts kaolin to 6.5 parts sodium lignosulfonate solution, then add 2.5 parts phosphate buffer solution, stir well to obtain the filling solution; S102: The preheated glass fiber and the filling liquid are mixed at a weight ratio of 5:3 and ball-milled. After ball milling, the ball milling speed is 1250 r / min and the ball milling time is 2h. The mixture is then filtered and dried to obtain the fiber filler.

[0044] In this embodiment, the sodium lignosulfonate solution has a mass fraction of 6.5%; the phosphate buffer solution has a pH value of 5.5. The mass fraction of the potassium permanganate solution in this embodiment is 12.5%.

[0045] This embodiment describes the application of a method for preparing drilling mud material in oil well drilling.

[0046] Example 4. This embodiment of a drilling mud material preparation method includes the following steps: Step 1: Weigh the raw materials according to the specified weight proportions: 47 parts of Grade G oil well cement, 6 parts of modified silica fume, 5 parts of fiber filler, 22 parts of water, and 4 parts of fly ash; Step 2: Mix the above raw materials thoroughly to obtain drilling mud material.

[0047] The method for preparing the modified silicon powder in this embodiment is as follows: S01: Preheat silicon powder at 56°C for 1 hour to obtain preheated silicon powder. Add the preheated silicon powder to a sodium dodecylbenzenesulfonate solution with a volume of 6 times the total volume of the preheated silicon powder and stir until homogeneous to obtain silicon powder liquid. S02: Add 22% of the total weight of the silicon powder liquid as additive to the silicon powder liquid, ball mill at 1100 r / min for 2 hours, filter and dry to obtain modified silicon powder.

[0048] The sodium dodecylbenzenesulfonate solution in this embodiment has a mass fraction of 6%.

[0049] The preparation method of the additive in this embodiment is as follows: S11: Mix silane coupling agent KH560, ethanol and water in a weight ratio of 4:7:5 to obtain a silane solution; mix 4 parts of nanocellulose, 2 parts of lanthanum oxide and 6 parts of silane solution to obtain a nanocellulose solution. S12: Mix 5 parts calcium sulfate whiskers, 2 parts silicon carbide and 6 parts dopamine hydrochloride solution evenly to obtain whisker solution; The nanocellulose solution, which is 22% of the total amount of the whisker solution, was added to the whisker solution and ball-milled. After ball milling, the mixture was filtered and dried to obtain the additive.

[0050] In this embodiment, the mass fraction of the hydrochloric acid dopamine solution is 5%; the ball milling speed is 1300 r / min, and the ball milling time is 2 h.

[0051] The preparation method of the fiber filler in this embodiment is as follows: S101: Stir the glass fiber in a sufficient amount of potassium permanganate solution, then wash with water, filter and dry. Preheat the dried glass fiber at 57°C for 1 hour to obtain preheated glass fiber. Add 3 parts boron nitride and 4 parts kaolin to 6 parts sodium lignosulfonate solution, then add 2 parts phosphate buffer solution, stir well to obtain filling solution; S102: The preheated glass fiber and filling liquid are mixed at a weight ratio of 5:3 and ball-milled. After ball milling, the ball milling speed is 1200 r / min and the ball milling time is 2h. The mixture is then filtered and dried to obtain the fiber filler.

[0052] In this embodiment, the sodium lignosulfonate solution has a mass fraction of 6%; the pH value of the phosphate buffer solution is 5.2. The potassium permanganate solution in this embodiment has a mass fraction of 12%.

[0053] This embodiment describes the application of a method for preparing drilling mud material in oil well drilling.

[0054] Comparative Example 1. Unlike Example 3, no modified silicon powder was added.

[0055] Comparative Example 2. Unlike Example 3, no additives were added during the preparation of the modified silicon powder.

[0056] Comparative Example 3. Unlike Example 3, no nanocellulose liquid was added to the additive.

[0057] Comparative Example 4. Unlike Example 3, no fiber filler was added.

[0058] Comparative Example 5. Unlike Example 3, no filling liquid was added during the preparation of the fiber filler.

[0059] The results of conventional performance tests in Examples 1-4 and Comparative Examples 1-5 are as follows:

[0060] From Examples 1-4 and Comparative Examples 1-5, it can be seen that the product of the present invention can achieve coordinated improvement in compressive strength, flowability, and water resistance and impermeability. The performance of the product shows a significant downward trend when neither modified silica powder nor fiber filler is added. Similarly, the performance of the product shows a downward trend when no additive is added during the preparation of modified silica powder, no nanocellulose liquid is added during the addition of additives, and no filler liquid is added during the preparation of fiber filler. Only the product raw materials obtained using the method of the present invention show the most significant performance improvement. The innovation of this invention lies in the following: the drilling mud material uses G-grade oil well cement, fly ash, modified silica fume, and fiber filler. Through the blending and coordination of the raw materials, the drilling mud material exhibits coordinated improvements in strength, fluidity, and water resistance over 24 hours. The modified silica fume is made by blending silica fume with sodium dodecylbenzene sulfonate solution and then ball milling it with additives. The whisker liquid and nanocellulose liquid in the additives are ball milled and optimized, and then combined with fiber filler for synergistic effect. The preheated glass fiber and filler liquid in the fiber filler are mutually blended and reinforced. Through the co-blending and improvement of the raw materials, the performance of the product can be further improved.

[0061] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0062] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for preparing drilling mud material, characterized in that, Includes the following steps: Step 1: Weigh the raw materials according to the specified weight proportions: 45-50 parts of Grade G oil well cement, 5-8 parts of modified silica fume, 4-7 parts of fiber filler, 20-25 parts of water, and 3-5 parts of fly ash; Step 2: Mix the above raw materials thoroughly to obtain drilling mud material.

2. The method for preparing drilling mud material according to claim 1, characterized in that, The modified silicon powder is prepared by: S01: Preheat silicon powder at 55-60℃ for 1 hour to obtain preheated silicon powder. Add the preheated silicon powder to a sodium dodecylbenzenesulfonate solution with a volume of 5-8 times the total volume of the preheated silicon powder and stir evenly to obtain silicon powder liquid. S02: Add 20-25% of the total weight of the silicon powder liquid to the silicon powder liquid, ball mill at a speed of 1000-1500 r / min for 2 hours, filter and dry to obtain modified silicon powder.

3. The method for preparing drilling mud material according to claim 2, characterized in that, The sodium dodecylbenzenesulfonate solution has a mass fraction of 5-8%.

4. The method for preparing drilling mud material according to claim 2, characterized in that, The preparation method of the additive is as follows: S11: Mix silane coupling agent KH560, ethanol and water in a weight ratio of (3-5):7:5 to obtain a silane solution; mix 3-5 parts of nanocellulose, 2-3 parts of lanthanum oxide and 5-8 parts of silane solution to obtain a nanocellulose solution. S12: Mix 4-6 parts of calcium sulfate whiskers, 2-3 parts of silicon carbide and 5-8 parts of dopamine hydrochloride solution evenly to obtain whisker solution; Add 20-25% of the total amount of nanocellulose solution to the whisker solution and ball mill. After ball milling, filter and dry to obtain the additive.

5. The method for preparing drilling mud material according to claim 4, characterized in that, The mass fraction of the hydrochloric acid dopamine solution is 4-7%; the ball milling speed is 1200-1500 r / min, and the ball milling time is 2 h.

6. The method for preparing drilling mud material according to claim 1, characterized in that, The fiber filler is prepared by: S101: Stir the glass fiber in a sufficient amount of potassium permanganate solution, then wash with water, filter and dry. Preheat the dried glass fiber at 55-60℃ for 1 hour to obtain preheated glass fiber. Add 2-4 parts boron nitride and 3-5 parts kaolin to 5-8 parts sodium lignosulfonate solution, then add 2-3 parts phosphate buffer solution, stir well to obtain filling solution; S102: The preheated glass fiber and filling liquid are mixed at a weight ratio of 5:3 and ball-milled. After ball milling, the ball milling speed is 1000-1500 r / min and the ball milling time is 2h. The mixture is then filtered and dried to obtain the fiber filler.

7. The method for preparing drilling mud material according to claim 6, characterized in that, The sodium lignosulfonate solution has a mass fraction of 5-8%; the phosphate buffer solution has a pH value of 5.0-6.

0.

8. A method for preparing drilling mud material according to claim 6, characterized in that, The potassium permanganate solution has a mass fraction of 10-15%.

9. The application of the method for preparing drilling mud material as described in any one of claims 1-8 in oil well drilling.

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