Production formula of modified graphite solid lubricant for drilling fluid

Abstract

The invention relates to the technical field of graphite solid lubricants, in particular to a production formula of a modified graphite solid lubricant for drilling fluid, and the formula comprises the following components: 1) a main component: 900 kg of crystalline flake graphite; the secondary component A comprises 40 kg of sulfonated corn oil and 30 kg of 15 # white oil and is used for modifying the surface of crystalline flake graphite, and the production formula and the process of the modified graphite solid lubricant for the drilling fluid can achieve efficient and comprehensive modification of the surfaces of crystalline flake graphite particles. A secondary component A (sulfonated corn oil and 15 # white oil) and a secondary component B (TW-80 and SP-80 surfactants) which are meticulously proportioned are combined with a special spraying process, so that the condition that the modified liquid can uniformly and fully cover each surface of graphite particles is ensured. The comprehensive modification not only enhances the lubricating property of the graphite particles, but also significantly improves the dispersibility and stability of the graphite particles in the drilling fluid.

Description

Technical Field

[0001] The invention relates to the technical field of graphite solid lubricants, in particular to a production formula of a modified graphite solid lubricant for drilling fluid. Background Art

[0002] In oil drilling operations, the lubrication performance of drilling fluid is one of the key factors to ensure that the drill tool can pass through the formation smoothly and reduce wear and energy consumption. Graphite solid lubricants are widely used in drilling fluids to improve their lubrication performance due to their unique layered structure and good slipperiness. However, there are some problems in the use of traditional graphite solid lubricants, especially in the addition of surfactants and the surface modification of graphite particles.

[0003] At present, a certain amount of surfactant is usually added to graphite solid lubricants during the production process to improve their dispersibility and lubrication performance in drilling fluids. However, due to the relatively small amount of addition, only part of the graphite particle surface can be effectively infiltrated and modified. According to statistics, only about 30% of the graphite particle surface can really benefit. This results in poor dispersion of graphite solid lubricants in drilling fluids in practical applications, and limited improvement in lubrication performance.

[0004] The reason for this is that, on the one hand, the selection and ratio of surfactants are not reasonable enough, so they cannot be effectively dispersed on the surface of graphite particles and play their modification role; on the other hand, traditional production processes often use simple mixing methods, which makes it impossible for surfactants to evenly cover the graphite particles, resulting in uneven modification effects. Summary of the invention

[0005] (I) Purpose of the invention

[0006] In view of this, the present invention proposes a new production formula and process of modified graphite solid lubricant for drilling fluid. The formula not only improves the temperature resistance of the product, but also enhances the dispersion effect of the surfactant through a reasonable ratio of white oil and sulfonated corn oil. At the same time, a special spraying process is adopted to spray the oil mixed with the surfactant evenly on the graphite particles, and the comprehensive modification of the graphite particle surface is achieved during the kneading process.

[0007] The graphite solid lubricant modified by this process and formula can be evenly dispersed in the drilling fluid and maintain good compatibility with other materials in the drilling fluid. In practical applications, this modified graphite solid lubricant can significantly improve the lubrication performance of the drilling fluid, reduce the wear and energy consumption of the drill tool, and thus improve the efficiency and economy of the drilling operation.

[0008] (II) Technical solution

[0009] A production formula of a modified graphite solid lubricant for drilling fluid, the formula comprising the following components in parts by weight:

[0010] 1) Main component: 900 kg flake graphite;

[0011] 2) Subcomponent A: including 40 kg of sulfonated corn oil and 30 kg of No. 15 white oil, used to modify the surface of flake graphite;

[0012] 3) Subcomponent B: including 15 kg of TW-80 (polyoxyethylene sorbitan monooleate) and 15 kg of SP-80 (sorbitan monostearate), used to improve the dispersibility and adhesion of the modified graphite in the drilling fluid;

[0013] 4) Additive A: sulfur, used for sulfonating corn oil to improve the temperature resistance of corn oil, wherein 65 kg of sulfur is used in the preparation process of sulfonated corn oil;

[0014] 5) and 5 kg of triethanolamine as auxiliary additives.

[0015] Preferably, the sulfonated corn oil is prepared by the following steps:

[0016] 1) Add 0.8 cubic meters of corn oil into a 1 cubic meter reactor and heat it to 100°C;

[0017] 2) Add 65 kg of sulfur and stir evenly;

[0018] 3) heating to 150° C. while stirring, and performing sulfonation reaction for 100 minutes;

[0019] 4) Stop heating and set aside after cooling.

[0020] Preferably, the modification process of the flake graphite comprises the following steps:

[0021] 1) Add 900 kg of flake graphite into a 1.5 cubic meter modified kneading machine with a spray device and heating function;

[0022] 2) Prepare the modified liquid, and mix subcomponent A, subcomponent B, additive A (except sulfur directly used for sulfonation) and triethanolamine in a formula ratio;

[0023] 3) adding 100 kg of the modified liquid prepared in step b) into the liquid tank (based on the total amount of the components in the formula after mixing, considering that the sulfonated corn oil already contains sulfur, the amount of sulfur directly used for sulfonation is not included here);

[0024] 4) Set the kneader to 60 degrees Celsius and stir the flake graphite while heating;

[0025] 5) When the temperature reaches 60°C, start spraying the modified liquid through the spray device while continuing to stir;

[0026] 6) After spraying is completed, continue stirring at constant temperature for 30 minutes;

[0027] 7) Cooling, discharging, random inspection, and bagging and storage after passing the inspection.

[0028] Preferably, the No. 15 white oil is a mineral oil having a specific viscosity index of 15, and is used to cooperate with sulfonated corn oil to perform surface modification on flake graphite.

[0029] Preferably, the TW-80 and SP-80 are used as surfactants to respectively enhance the adhesion of white oil and corn oil on the surface of flake graphite and improve the dispersion stability of modified graphite in drilling fluid.

[0030] Preferably, the triethanolamine is used as a regulator to adjust the pH of the system or enhance the compatibility between the components.

[0031] It can be seen from the above technical solutions that the present application has the following beneficial effects:

[0032] 1. The production formula and process of the modified graphite solid lubricant for drilling fluid provided by the invention can achieve efficient and comprehensive modification of the surface of flake graphite particles. Through the carefully proportioned subcomponent A (sulfonated corn oil and No. 15 white oil) and subcomponent B (TW-80 and SP-80 surfactants), combined with a special spraying process, it is ensured that the modified liquid can be evenly and fully covered on every surface of the graphite particles. This comprehensive modification not only enhances the lubrication performance of the graphite particles, but also significantly improves its dispersibility and stability in the drilling fluid, thereby effectively solving the problem of uneven dispersion and poor lubrication effect of traditional graphite solid lubricants in drilling fluids.

[0033] 2. The graphite solid lubricant modified by the process and formula of the invention can be evenly dispersed in the drilling fluid and maintain good compatibility with other materials in the drilling fluid. The use of this modified graphite solid lubricant can significantly improve the lubrication performance of the drilling fluid, reduce the friction resistance between the drill tool and the well wall, and reduce the wear and energy consumption of the drill tool. At the same time, due to the comprehensive modification of the surface of the graphite particles, the drilling fluid has stronger adaptability in complex formations and can effectively cope with various drilling challenges, thereby improving the overall efficiency and safety of drilling operations.

[0034] 3. The graphite solid lubricant modified by the process and formula of the invention can be evenly dispersed in the drilling fluid and maintain good compatibility with other materials in the drilling fluid. The use of this modified graphite solid lubricant can significantly improve the lubrication performance of the drilling fluid, reduce the friction resistance between the drill tool and the well wall, and reduce the wear and energy consumption of the drill tool. At the same time, due to the comprehensive modification of the surface of the graphite particles, the drilling fluid has stronger adaptability in complex formations and can effectively cope with various drilling challenges, thereby improving the overall efficiency and safety of drilling operations. DETAILED DESCRIPTION

[0035] An embodiment provided by the present invention:

[0036] A production formula of a modified graphite solid lubricant for drilling fluid, the formula comprising the following components in parts by weight:

[0037] 1) Main component: 900 kg flake graphite;

[0038] 2) Subcomponent A: including 40 kg of sulfonated corn oil and 30 kg of No. 15 white oil, used to modify the surface of flake graphite;

[0039] 3) Subcomponent B: including 15 kg of TW-80 (polyoxyethylene sorbitan monooleate) and 15 kg of SP-80 (sorbitan monostearate), used to improve the dispersibility and adhesion of modified graphite in drilling fluid;

[0040] 4) Additive A: sulfur, used for sulfonating corn oil to improve the temperature resistance of corn oil, wherein 65 kg of sulfur is used in the preparation process of sulfonated corn oil;

[0041] 5) and 5 kg of triethanolamine as auxiliary additives.

[0042] Further, the sulfonated corn oil is prepared by the following steps:

[0043] 1) Add 0.8 cubic meters of corn oil into a 1 cubic meter reactor and heat it to 100°C;

[0044] 2) Add 65 kg of sulfur and stir evenly;

[0045] 3) heating to 150° C. while stirring, and performing sulfonation reaction for 100 minutes;

[0046] 4) Stop heating and set aside after cooling.

[0047] Further, the modification process of flake graphite includes the following steps:

[0048] 1) Add 900 kg of flake graphite into a 1.5 cubic meter modified kneading machine with a spray device and heating function;

[0049] 2) Prepare the modified liquid, and mix subcomponent A, subcomponent B, additive A (except sulfur directly used for sulfonation) and triethanolamine in a formula ratio;

[0050] 3) adding 100 kg of the modified liquid prepared in step b) into the liquid tank (based on the total amount of the components in the formula after mixing, considering that the sulfonated corn oil already contains sulfur, the amount of sulfur directly used for sulfonation is not included here);

[0051] 4) Set the kneader to 60 degrees Celsius and stir the flake graphite while heating;

[0052] 5) When the temperature reaches 60°C, start spraying the modified liquid through the spray device while continuing to stir;

[0053] 6) After spraying is completed, continue stirring at constant temperature for 30 minutes;

[0054] 7) Cooling, discharging, random inspection, and bagging and storage after passing the inspection.

[0055] Furthermore, No. 15 white oil is a mineral oil with a specific viscosity number of 15, which is used to cooperate with sulfonated corn oil to modify the surface of flake graphite. The use of mineral oil with a specific viscosity number of 15 as No. 15 white oil brings significant advantages in the production of modified graphite solid lubricants for drilling fluids. This white oil can not only synergize with sulfonated corn oil to more effectively modify the surface of flake graphite, but also is easy to be evenly distributed among graphite particles due to its moderate viscosity. This synergistic modification not only enhances the lubrication performance of graphite particles, but also improves their dispersibility and stability in drilling fluids.

[0056] Furthermore, TW-80 and SP-80, as surfactants, respectively enhance the adhesion of white oil and corn oil on the surface of flake graphite, and improve the dispersion stability of modified graphite in drilling fluid. TW-80 (polyoxyethylene sorbitan monooleate) and SP-80 (sorbitan monostearate) as surfactants play a vital role in the production of modified graphite solid lubricants for drilling fluid. They can respectively enhance the adhesion of white oil and corn oil on the surface of flake graphite, so that the modified liquid can be more tightly wrapped on the graphite particles, thereby improving the lubrication performance and dispersion stability of the graphite particles.

[0057] Preferably, the triethanolamine is used as a regulator to adjust the pH of the system or enhance the compatibility between the components. Triethanolamine as a regulator also plays an important role in the production of modified graphite solid lubricants for drilling fluids. It can effectively adjust the pH of the system and ensure that the components are stably present within a suitable pH range, thereby avoiding problems such as component decomposition or precipitation caused by inappropriate pH.

[0058] 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 present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A production formula of modified graphite solid lubricant for drilling fluid, characterized in that: The formula includes the following components in parts by weight: 1) Main component: 900 kg flake graphite; 2) Subcomponent A: including 40 kg of sulfonated corn oil and 30 kg of No. 15 white oil, used to modify the surface of flake graphite; 3) Subcomponent B: including 15 kg of TW-80 (polyoxyethylene sorbitan monooleate) and 15 kg of SP-80 (sorbitan monostearate), used to improve the dispersibility and adhesion of the modified graphite in the drilling fluid; 4) Additive A: sulfur, used for sulfonating corn oil to improve the temperature resistance of corn oil, wherein 65 kg of sulfur is used in the preparation process of sulfonated corn oil; 5) and 5 kg of triethanolamine as auxiliary additives.

2. The production formula of a modified graphite solid lubricant for drilling fluid according to claim 1, characterized in that: The sulfonated corn oil is prepared by the following steps: 1) Add 0.8 cubic meters of corn oil into a 1 cubic meter reactor and heat it to 100°C; 2) Add 65 kg of sulfur and stir evenly; 3) heating to 150° C. while stirring, and performing sulfonation reaction for 100 minutes; 4) Stop heating and let it cool down before use.

3. The production formula of a modified graphite solid lubricant for drilling fluid according to claim 1, characterized in that: The modification process of the flake graphite comprises the following steps: 1) Add 900 kg of flake graphite into a 1.5 cubic meter modified kneading machine with a spray device and heating function; 2) Prepare the modified liquid, and mix subcomponent A, subcomponent B, additive A (except sulfur directly used for sulfonation) and triethanolamine in a formula ratio; 3) adding 100 kg of the modified liquid prepared in step b) into the liquid tank (based on the total amount of the components in the formula after mixing, considering that the sulfonated corn oil already contains sulfur, the amount of sulfur directly used for sulfonation is not included here); 4) Set the kneader to 60 degrees Celsius and stir the flake graphite while heating; 5) When the temperature reaches 60°C, start spraying the modified liquid through the spray device while continuing to stir; 6) After spraying is completed, continue stirring at constant temperature for 30 minutes; 7) Cooling, discharging, random inspection, and bagging and storage after passing the inspection.

4. The production formula of a modified graphite solid lubricant for drilling fluid according to claim 1, characterized in that: The No. 15 white oil is a mineral oil with a specific viscosity index of 15, and is used to perform surface modification on flake graphite in coordination with sulfonated corn oil.

5. The production formula of a modified graphite solid lubricant for drilling fluid according to claim 1, characterized in that: The TW-80 and SP-80 are used as surfactants to respectively enhance the adhesion of white oil and corn oil on the surface of flake graphite and improve the dispersion stability of modified graphite in drilling fluid.

6. The production formula of a modified graphite solid lubricant for drilling fluid according to claim 1, characterized in that The triethanolamine is used as a regulator to adjust the pH of the system or enhance the compatibility between the components.