Multifunctional lubricant for drilling fluid and preparation method thereof

Abstract

The invention discloses a multifunctional lubricant for drilling fluid and a preparation method thereof.The lubricant comprises a component A, a component B, a component C and a component D. The component A is prepared from, by weight, 40-60 parts of crystalline flake graphite and 40-60 parts of nano-graphite powder, and the component B is prepared from, by weight, 40-60 parts of nano-graphite powder. The lubricating agent comprises the following components in parts by weight: 20-40 parts of No. 15 white oil, 30-50 parts of modified vegetable oil and 20-40 parts of No. 10 white oil. By arranging the component D, the prepared lubricating agent has the effects of improving the lubricating property of a water-based drilling fluid, reducing the frictional resistance among a drilling tool, a sleeve and a well wall, preventing blockage and resistance, and being good in compatibility with the drilling fluid, relatively high in salt resistance and high temperature resistance, and capable of being used for drilling the drilling fluid. The use requirements of people are met; by arranging the component B and the component C, the graphite surface is modified, the dispersing capacity and the adhesive capacity of the modified graphite lubricant in the drilling fluid are improved, and the practicability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricants, in particular to a multifunctional lubricant for drilling fluid and a preparation method thereof. Background Art

[0002] Lubricants for drilling fluid play a vital role in the drilling process. Lubricants can form a protective film between the drill bit and the well wall, significantly reducing friction, thereby reducing wear and heat generation. Lubricants can reduce the risk of drill bit sticking and clogging, and increase drilling efficiency. The addition of lubricants can reduce wear on equipment and well walls, and extend service life. The use of lubricants can improve drilling efficiency and reduce downtime during drilling. Lubricants can optimize the plasticizing properties of drilling fluid and improve well wall stability. Lubricants can extend the life of drill bit bearings and correspondingly extend the service life of drill tools and drill bits. Lubricants can shorten the time of drilling and drilling. Lubricants can rotate drill tools with less power, saving diesel and extending equipment life. Lubricants can effectively prevent mud packing on the drill bit and prevent sticking.

[0003] Weigh graphite, base oil, and additives according to the formula ratio. Graphite should be crushed and sieved to obtain the required particle size. Place graphite, base oil, and additives in a blender and stir thoroughly to evenly disperse the components. Filter the stirred mixture to remove impurities and large graphite particles. Fill the filtered graphite lubricant into an appropriate container and seal it for storage.

[0004] Graphite lubricants have excellent lubrication properties, high temperature resistance and corrosion resistance. Using graphite lubricants in high-speed, high-temperature and heavy-load friction parts can effectively reduce wear and extend the service life of equipment. In addition, graphite lubricants also have good self-lubricating properties and are suitable for occasions where frequent refueling or oil changes are not possible. In actual applications, graphite lubricants are widely used in friction parts such as sliding bearings, gears, guide rails of various mechanical equipment. For example, in heavy machinery in metallurgy, mining, electric power and other industries, graphite lubricants can effectively improve the operating efficiency and service life of equipment. In addition, graphite lubricants also play an important role in high-precision fields such as aerospace and automobile manufacturing.

[0005] However, traditional lubricants have the following disadvantages:

[0006] Traditional lubricants have poor high-temperature resistance. When used in high-temperature environments, the lubricants themselves are prone to degradation due to high-temperature aging, which reduces the lubricating properties of the drilling fluid itself and cannot meet people's usage needs. Summary of the Invention

[0007] The purpose of the present invention is to provide a multifunctional lubricant for drilling fluid and a preparation method thereof, so as to solve the problem proposed in the above background technology that traditional lubricants have poor high temperature resistance. When used in high temperature environments, the lubricants themselves are easily degraded due to high temperature aging, which reduces the lubricating performance of the drilling fluid itself and cannot meet people's usage needs.

[0008] To achieve the above object, the present invention provides the following technical solution: a multifunctional lubricant for drilling fluid, comprising a lubricant, wherein the lubricant comprises component A, component B, component C and component D, wherein component A comprises the following components: 40-60 parts by weight of flake graphite and 40-60 parts by weight of nanographite powder, and component B comprises the following components: 20-40 parts by weight of No. 15 white oil and 30-50 parts by weight of modified vegetable oil. , 20-40 parts of No. 10 white oil, the component C comprises the following components: by weight, 30-60 parts of polyoxyethylene sorbitan monooleate and 30-60 parts of sorbitan monostearate, the component D comprises the following components: by weight, 10-20 parts of a molecular weight regulator, 10-20 parts of a wetting agent, 10-20 parts of an alkalinity regulator, 20-40 parts of a salt-resistant agent and 20-40 parts of a high-temperature resistant agent.

[0009] As a preferred technical solution of the present invention, the anti-salt agent includes dimethyl silicone oil, castor oil and alkylphenol polyoxyethylene ether.

[0010] As a preferred technical solution of the present invention, the high temperature resistant agent is one or more of polyglycerol or HTX.

[0011] As a preferred technical solution of the present invention, the modified vegetable oil is one or more of modified palm oil, modified corn oil or modified peanut oil.

[0012] As a preferred technical solution of the present invention, the molecular weight regulator is one or more of titanium tetrachloride, mercaptoethyl propionate or montmorillonite.

[0013] As a preferred technical solution of the present invention, the wetting agent is one or more of fatty phenolamine, sorbitan ester, sucrose ester or high-carbon fatty alcohol polyoxyethylene ether.

[0014] As a preferred technical solution of the present invention, the alkalinity regulator is one or more of sodium hydroxide or potassium hydroxide.

[0015] The present invention provides a method for preparing a multifunctional lubricant for drilling fluid, comprising the following steps:

[0016] Step 1, first mixing: 20-40 parts of No. 15 white oil, 30-50 parts of modified vegetable oil, 20-40 parts of No. 10 white oil in component B, 10-20 parts of molecular weight regulator and 10-20 parts of wetting agent in component D are introduced into a reactor, mixed and ultrasonically stirred to obtain solution A;

[0017] Step 2, second mixing: 40-60 parts of flake graphite and 40-60 parts of nanographite powder in component A are mixed with solution A, and ultrasonic stirring is performed to obtain intermediate product A;

[0018] Step 3, third mixing: 10-20 parts of the alkalinity regulator in component D are mixed with the intermediate product A and stirred to obtain the intermediate product B;

[0019] Step 4, fourth mixing: 20-40 parts of the anti-salt agent and 20-40 parts of the high temperature resistant agent in component D are mixed with 30-60 parts of the polyoxyethylene sorbitan monooleate and 30-60 parts of the sorbitan monostearate in component C, and stirred to obtain solution B;

[0020] Step 5: Spraying: spray solution B evenly onto the surface of the intermediate product B using a spraying device.

[0021] As a preferred technical solution of the present invention, the temperature of ultrasonic stirring in step one, the temperature of ultrasonic stirring in step two, the temperature of ultrasonic stirring in step three and the temperature of ultrasonic stirring in step four are all 60°C-80°C.

[0022] As a preferred technical solution of the present invention, the ultrasonic stirring time in step one, the ultrasonic stirring time in step two, the ultrasonic stirring time in step three and the ultrasonic stirring time in step four are all 30 min-60 min.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. By adding component D, the prepared lubricant improves the lubrication performance of water-based drilling fluid, reduces the friction resistance between drill tools, casing and well wall, prevents sticking and blocking, and has good compatibility with drilling fluid. It also has strong salt resistance and high temperature resistance, meeting people's use needs;

[0025] 2. By setting component B and component C, the graphite surface is modified respectively, and the dispersion ability and adhesion ability of the modified graphite lubricant in the drilling fluid are improved, which is highly practical;

[0026] 3. This preparation method, combined with a special spraying process, ensures that the mixed solution is evenly and fully covered on every surface of component A, enhancing the lubricating properties of the graphite lubricant and significantly improving its dispersibility and stability in the drilling fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the structure of the lubricant of the present invention;

[0028] Figure 2 Schematic diagram of the structure of component A of the present invention;

[0029] Figure 3 Schematic diagram of the structure of component B of the present invention;

[0030] Figure 4 Schematic diagram of the structure of component C of the present invention;

[0031] Figure 5 Schematic diagram of the structure of component D of the present invention;

[0032] Figure 6 Flowchart of the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] See also Figure 1-6 The present invention provides a multifunctional lubricant for drilling fluid, including a lubricant, wherein the lubricant includes component A, component B, component C, and component D. Component A is prepared by the following components: 40-60 parts by weight of flake graphite and 40-60 parts by weight of nanographite powder; component B is prepared by the following components: 20-40 parts by weight of No. 15 white oil, 30-50 parts by weight of modified vegetable oil, and 20-40 parts by weight of No. 10 white oil; component C is prepared by the following components: 30-60 parts by weight of polyoxyethylene sorbitan monooleate and 30-60 parts by weight of sorbitan monostearate; and component D is prepared by the following components: 10-20 parts by weight of a molecular weight regulator, 10-20 parts by weight of a wetting agent, 10-20 parts by weight of a basicity regulator, 20-40 parts by weight of a salt-resistant agent, and 20-40 parts by weight of a high-temperature resistant agent.

[0035] Antisalt agents include dimethicone, castor oil and alkylphenol polyoxyethylene ether.

[0036] The high temperature resistant agent is one or more of polyglycerol or HTX.

[0037] The modified vegetable oil is one or more of modified palm oil, modified corn oil or modified peanut oil.

[0038] The molecular weight regulator is one or more of titanium tetrachloride, mercaptoethyl propionate or montmorillonite.

[0039] The wetting agent is one or more of fatty phenolamine, sorbitan ester, sucrose ester or high-carbon fatty alcohol polyoxyethylene ether.

[0040] The alkalinity regulator is one or more of sodium hydroxide or potassium hydroxide.

[0041] The present invention provides a method for preparing a multifunctional lubricant for drilling fluid, comprising the following steps:

[0042] Step 1, first mixing: 20-40 parts of No. 15 white oil, 30-50 parts of modified vegetable oil, 20-40 parts of No. 10 white oil in component B, 10-20 parts of molecular weight regulator and 10-20 parts of wetting agent in component D are introduced into a reactor, mixed and ultrasonically stirred to obtain solution A;

[0043] Step 2, second mixing: 40-60 parts of flake graphite and 40-60 parts of nanographite powder in component A are mixed with solution A, and ultrasonic stirring is performed to obtain intermediate product A;

[0044] Step 3, third mixing: 10-20 parts of the alkalinity regulator in component D are mixed with the intermediate product A and stirred to obtain the intermediate product B;

[0045] Step 4, fourth mixing: 20-40 parts of the anti-salt agent and 20-40 parts of the high temperature resistant agent in component D are mixed with 30-60 parts of the polyoxyethylene sorbitan monooleate and 30-60 parts of the sorbitan monostearate in component C, and stirred to obtain solution B;

[0046] Step 5: Spraying: spray solution B evenly onto the surface of the intermediate product B using a spraying device.

[0047] The temperature of ultrasonic stirring in step 1, the temperature of ultrasonic stirring in step 2, the temperature of ultrasonic stirring in step 3 and the temperature of ultrasonic stirring in step 4 are all 60° C.-80° C.

[0048] The ultrasonic stirring time in step 1, the ultrasonic stirring time in step 2, the ultrasonic stirring time in step 3 and the ultrasonic stirring time in step 4 are all 30 min to 60 min.

[0049] Example 1:

[0050] In the present invention, 20-40 parts of No. 15 white oil, 30-50 parts of modified vegetable oil, 20-40 parts of No. 10 white oil in component B, and 10-20 parts of molecular weight regulator and 10-20 parts of wetting agent in component D are introduced into a reactor, mixed and ultrasonically stirred to obtain solution A; 40-60 parts of flake graphite and 40-60 parts of nanographite powder in component A are mixed with solution A, and ultrasonically stirred to obtain intermediate product A; 10-20 parts of alkalinity regulator in component D are mixed with intermediate product A and stirred to obtain intermediate product B; 20-40 parts of salt-resistant agent and 20-40 parts of high-temperature resistant agent in component D are mixed with 30-60 parts of polyoxyethylene sorbitan monooleate and 30-60 parts of sorbitan monostearate in component C and stirred to obtain solution B; and solution B is evenly sprayed on the surface of intermediate product B by a spray device.

[0051] Example 2:

[0052] In the present invention, 20 parts of No. 15 white oil, 40 parts of modified vegetable oil, 40 parts of No. 10 white oil in component B, and 10 parts of a molecular weight regulator and 10 parts of a wetting agent in component D are introduced into a reactor, mixed, and ultrasonically stirred to obtain a solution A; 40 parts of flake graphite and 60 parts of nanographite powder in component A are mixed with the solution A, and ultrasonically stirred to obtain an intermediate product A; 20 parts of an alkalinity regulator in component D are mixed with the intermediate product A and stirred to obtain an intermediate product B; 20 parts of a salt-resistant agent and 40 parts of a high-temperature resistant agent in component D are mixed with 60 parts of polyoxyethylene sorbitan monooleate and 40 parts of sorbitan monostearate in component C and stirred to obtain a solution B; and the solution B is evenly sprayed on the surface of the intermediate product B by a spray device.

[0053] Example 3:

[0054] In the present invention, 40 parts of No. 15 white oil, 30 parts of modified vegetable oil, 30 parts of No. 10 white oil in component B, and 20 parts of a molecular weight regulator and 20 parts of a wetting agent in component D are introduced into a reactor, mixed, and ultrasonically stirred to obtain a solution A; 60 parts of flake graphite and 40 parts of nanographite powder in component A are mixed with the solution A, and ultrasonically stirred to obtain an intermediate product A; 10 parts of an alkalinity regulator in component D are mixed with the intermediate product A and stirred to obtain an intermediate product B; 20 parts of a salt-resistant agent and 30 parts of a high-temperature resistant agent in component D are mixed with 50 parts of polyoxyethylene sorbitan monooleate and 50 parts of sorbitan monostearate in component C and stirred to obtain a solution B; and the solution B is evenly sprayed on the surface of the intermediate product B by a spray device.

[0055] Example 4:

[0056] In the present invention, 30 parts of No. 15 white oil, 30 parts of modified vegetable oil, 40 parts of No. 10 white oil in component B, and 10 parts of a molecular weight regulator and 10 parts of a wetting agent in component D are introduced into a reactor, mixed, and ultrasonically stirred to obtain a solution A; 55 parts of flake graphite and 45 parts of nanographite powder in component A are mixed with the solution A, and ultrasonically stirred to obtain an intermediate product A; 10 parts of an alkalinity regulator in component D are mixed with the intermediate product A and stirred to obtain an intermediate product B; 35 parts of a salt-resistant agent and 35 parts of a high-temperature resistant agent in component D are mixed with 45 parts of polyoxyethylene sorbitan monooleate and 55 parts of sorbitan monostearate in component C and stirred to obtain a solution B; and solution B is evenly sprayed on the surface of the intermediate product B by a spray device.

[0057] Example 5:

[0058] In the present invention, 40 parts of No. 15 white oil, 40 parts of modified vegetable oil, 20 parts of No. 10 white oil in component B, and 10 parts of molecular weight regulator and wetting agent in component D are introduced into a reactor, mixed and ultrasonically stirred to obtain solution A; 45 parts of flake graphite and 55 parts of nanographite powder in component A are mixed with solution A, and ultrasonically stirred to obtain intermediate product A; 10 parts of alkalinity regulator in component D are mixed with intermediate product A and stirred to obtain intermediate product B; 40 parts of salt-resistant agent and 30 parts of high-temperature resistant agent in component D are mixed with 40 parts of polyoxyethylene sorbitan monooleate and 60 parts of sorbitan monostearate in component C and stirred to obtain solution B; and solution B is evenly sprayed on the surface of intermediate product B by a spray device.

[0059] In the present invention, No. 15 white oil, modified vegetable oil, and No. 10 white oil are used to modify the graphite surface. Polyoxyethylene sorbitan monooleate and sorbitan monostearate are used to improve the dispersion and adhesion of graphite in drilling fluid. The molecular weight regulator reduces the rate of polymerization, thereby extending the reaction time. By extending the reaction time, the molecular weight regulator allows the growing polymer chain to continue to grow, thereby increasing the molecular weight of the polymer. The wetting agent improves the wettability of the lubricant, the alkalinity regulator adjusts the pH value of the lubricant, the salt resistance agent improves the salt resistance of the lubricant, and the high temperature resistance agent improves the high temperature resistance of the lubricant. Table 1 shows the test results of different embodiments:

[0060]

[0061] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multifunctional lubricant for drilling fluid, comprising a lubricant, characterized in that: The lubricant includes component A, component B, component C and component D, wherein component A is prepared from the following components: 40-60 parts of flake graphite and 40-60 parts of nanographite powder, by weight; component B is prepared from the following components: 20-40 parts of No. 15 white oil, 30-50 parts of modified vegetable oil, and 20-40 parts of No. 10 white oil, by weight; component C is prepared from the following components: 30-60 parts of polyoxyethylene sorbitan monooleate and 30-60 parts of sorbitan monostearate, by weight; and component D is prepared from the following components: 10-20 parts of a molecular weight regulator, 10-20 parts of a wetting agent, 10-20 parts of an alkalinity regulator, 20-40 parts of a salt-resistant agent, and 20-40 parts of a high-temperature resistant agent, by weight.

2. The multifunctional lubricant for drilling fluid according to claim 1, characterized in that: The anti-salt agent includes dimethyl silicone oil, castor oil and alkylphenol polyoxyethylene ether.

3. The multifunctional lubricant for drilling fluid according to claim 1, characterized in that: The high temperature resistant agent is one or more of polyglycerol or HTX.

4. The multifunctional lubricant for drilling fluid according to claim 1, characterized in that: The modified vegetable oil is one or more of modified palm oil, modified corn oil or modified peanut oil.

5. The multifunctional lubricant for drilling fluid according to claim 1, characterized in that: The molecular weight regulator is one or more of titanium tetrachloride, mercaptoethyl propionate or montmorillonite.

6. The multifunctional lubricant for drilling fluid according to claim 1, characterized in that: The wetting agent is one or more of fatty phenolamine, sorbitan ester, sucrose ester or high-carbon fatty alcohol polyoxyethylene ether.

7. The multifunctional lubricant for drilling fluid according to claim 1, characterized in that: The alkalinity regulator is one or more of sodium hydroxide or potassium hydroxide.

8. The method for preparing a multifunctional lubricant for drilling fluid according to claim 1, characterized in that: The following steps are involved: Step 1, first mixing: 20-40 parts of No. 15 white oil, 30-50 parts of modified vegetable oil, 20-40 parts of No. 10 white oil in component B, 10-20 parts of molecular weight regulator and 10-20 parts of wetting agent in component D are introduced into a reactor, mixed and ultrasonically stirred to obtain solution A; Step 2, second mixing: 40-60 parts of flake graphite and 40-60 parts of nanographite powder in component A are mixed with solution A, and ultrasonic stirring is performed to obtain intermediate product A; Step 3, third mixing: 10-20 parts of the alkalinity regulator in component D are mixed with the intermediate product A and stirred to obtain the intermediate product B; Step 4, fourth mixing: 20-40 parts of the anti-salt agent and 20-40 parts of the high temperature resistant agent in component D are mixed with 30-60 parts of the polyoxyethylene sorbitan monooleate and 30-60 parts of the sorbitan monostearate in component C, and stirred to obtain solution B; Step 5: Spraying: spray solution B evenly onto the surface of the intermediate product B using a spraying device.

9. The method for preparing a multifunctional lubricant for drilling fluid according to claim 8, characterized in that: The temperature of ultrasonic stirring in step 1, the temperature of ultrasonic stirring in step 2, the temperature of ultrasonic stirring in step 3 and the temperature of ultrasonic stirring in step 4 are all 60° C.-80° C.

10. The method for preparing a multifunctional lubricant for drilling fluid according to claim 1, characterized in that: The ultrasonic stirring time in step 1, the ultrasonic stirring time in step 2, the ultrasonic stirring time in step 3 and the ultrasonic stirring time in step 4 are all 30 min-60 min.

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