阅读说明：本技术 一种极压润滑剂及其制备方法 (Extreme pressure lubricant and preparation method thereof ) 是由 欧猛 梁益 李朝凯 邓宇 邵平 于雅璐 冯学荣 杨野 于 2019-09-28 设计创作，主要内容包括：本发明公开了一种极压润滑剂及其制备方法。该润滑剂包括以下重量份的组分：十八碳烯琥珀酸酐20～30份、环己胺30～50份、催化剂1～5份、二氯亚砜1～5份、乳化剂5～10份、硼酸5～10份、固体润滑剂1～5份,以及磷脂10～15份。本发明制备得到的润滑剂对钻具具有优异的保护效果。(The invention discloses an extreme pressure lubricant and a preparation method thereof. The lubricant comprises the following components in parts by weight: 20-30 parts of octadecene succinic anhydride, 30-50 parts of cyclohexylamine, 1-5 parts of a catalyst, 1-5 parts of thionyl chloride, 5-10 parts of an emulsifier, 5-10 parts of boric acid, 1-5 parts of a solid lubricant and 10-15 parts of phospholipid. The lubricant prepared by the invention has excellent protection effect on drilling tools.)

1. The extreme pressure lubricant is characterized by comprising the following components in parts by weight:

20-30 parts of octadecene succinic anhydride, 30-50 parts of cyclohexylamine, 1-5 parts of a catalyst, 1-5 parts of thionyl chloride, 5-10 parts of an emulsifier, 5-10 parts of boric acid, 1-5 parts of a solid lubricant and 10-15 parts of phospholipid.

2. The extreme pressure lubricant according to claim 1, comprising the following components in parts by weight:

30 parts of octadecene succinic anhydride, 30 parts of cyclohexylamine, 4 parts of catalyst, 5 parts of thionyl chloride, 5 parts of emulsifier, 10 parts of boric acid, 3 parts of solid lubricant and 10 parts of phospholipid.

3. The extreme pressure lubricant according to claim 1 or 2, characterized in that the catalyst is a lye.

4. The extreme pressure lubricant according to claim 1 or 2, wherein the emulsifier comprises triethanolamine and stearic acid in a weight ratio of 3-5: 1-2.

5. The extreme pressure lubricant according to claim 1 or 2, wherein the emulsifier comprises triethanolamine and stearic acid in a weight ratio of 4: 1.

6. The extreme pressure lubricant according to claim 1 or 2, characterized in that the solid lubricant graphite powder.

7. The method for preparing an extreme pressure lubricant according to any one of claims 1 to 6, comprising the steps of:

(1) stirring and mixing octadecene succinic anhydride, cyclohexylamine, a catalyst and thionyl chloride according to a formula, and reacting for 6-10 h at the temperature of 80-150 ℃;

(2) stirring and mixing boric acid and the product obtained in the step (1), and reacting for 5-10 h at the temperature of 60-100 ℃;

(3) and (3) stirring and mixing an emulsifier and the product obtained in the step (2), emulsifying for 2-5 h at 80-150 ℃, then adding a solid lubricant and phospholipid, and mixing and stirring for 1-2 h at 50-80 ℃.

8. The method according to claim 7, wherein the reaction temperature in the step (1) is 120 ℃ and the reaction time is 8 hours.

9. The method according to claim 7, wherein the reaction temperature in the step (2) is 90 ℃ and the reaction time is 5 hours.

10. The method according to claim 7, wherein the emulsification temperature in the step (3) is 80 ℃ and the emulsification time is 3 hours.

Technical Field

The invention belongs to the technical field of lubricant preparation, and particularly relates to an extreme pressure lubricant and a preparation method thereof.

Background

The lubricant for the drilling fluid is an important drilling fluid additive in the drilling process, and has the functions of improving the lubricating property of the drilling fluid, reducing the friction between a drilling tool, a casing and a well wall, reducing the rotating torque of a drill string in the drilling process and the resistance generated when the drill string is taken off and put in the well, and reducing the occurrence rate of drilling sticking accidents to the lowest.

Common liquid lubricants for drilling fluids include both oil-based lubricants and water-based (emulsified) lubricants. The two types of lubricants can simultaneously and greatly reduce the friction resistance coefficients of the drilling fluid and the mud cakes, and are not common in the market. The use of the water-based lubricant is greatly limited by the temperature, and the water-based lubricant is demulsified and used after being stored for a long time. The vegetable oil lubricant in the oil-based lubricant has the advantages of no toxicity, good degradability, low fluorescence level and the like, and is an environment-friendly lubricant for drilling fluid with a better application prospect.

However, the conventional vegetable oil lubricants have high cost, poor thermal stability in use, and poor protective properties for drill casings and the like.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides an extreme pressure lubricant and a preparation method thereof, which can effectively solve the problems that the existing lubricant has poor thermal stability and cannot effectively protect drilling tools.

In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:

an extreme pressure lubricant comprises the following components in parts by weight:

20-30 parts of octadecene succinic anhydride, 30-50 parts of cyclohexylamine, 1-5 parts of a catalyst, 1-5 parts of thionyl chloride, 5-10 parts of an emulsifier, 5-10 parts of boric acid, 1-5 parts of a solid lubricant and 10-15 parts of phospholipid.

Further, the paint comprises the following components in parts by weight:

30 parts of octadecene succinic anhydride, 30 parts of cyclohexylamine, 4 parts of catalyst, 5 parts of thionyl chloride, 5 parts of emulsifier, 10 parts of boric acid, 3 parts of solid lubricant and 10 parts of phospholipid.

Further, the catalyst is alkali liquor.

Further, the emulsifier comprises triethanolamine and stearic acid in a weight ratio of 3-5: 1-2.

Further, the emulsifier comprises triethanolamine and stearic acid in a weight ratio of 5: 1.

Further, a solid lubricant, graphite powder.

The preparation method of the extreme pressure lubricant comprises the following steps:

(1) stirring and mixing octadecene succinic anhydride, cyclohexylamine, a catalyst and thionyl chloride according to a formula, and reacting for 6-10 h at the temperature of 80-150 ℃;

(2) stirring and mixing boric acid and the product obtained in the step (1), and reacting for 5-10 h at the temperature of 60-100 ℃;

(3) and (3) stirring and mixing an emulsifier and the product obtained in the step (2), emulsifying for 2-5 h at 80-150 ℃, then adding a solid lubricant and phospholipid, and mixing and stirring for 1-2 h at 50-80 ℃.

Further, the reaction temperature in the step (1) is 120 ℃, and the reaction time is 8 h.

Further, the reaction temperature in the step (2) is 90 ℃, and the reaction time is 2 h.

Further, the emulsifying temperature in the step (3) is 80 ℃, and the emulsifying time is 3 h.

The invention has the beneficial effects that:

1. octadecene succinic anhydride without a branched chain is used as a substrate to perform amidation reaction with cyclohexylamine, a catalyst and thionyl chloride to generate an amide group, so that the temperature resistance of the prepared lubricant can be effectively improved, and then boric acid and boric acid are subjected to esterification reaction to enable the prepared lubricant to be stably adsorbed on the surfaces of clay and metal to form a protective film, so that the drilling tool is protected; meanwhile, the cyclohexylamine is alkaline primary amine, so that a certain alkaline condition can be provided for the reaction, and the smooth proceeding of the reaction is further ensured.

2. The emulsifier is composed of triethanolamine and stearic acid, and contains both hydrophilic groups and lipophilic groups, so that the emulsifier can be used as a surfactant to modify esterification products, and can improve the film-forming property of the prepared lubricant.

3. The phospholipid added in the formula of the invention contains hydrophilic groups and lipophilic groups, can be used as a surfactant, has excellent film-forming property, can be used as a surface modifier to further modify an esterification product, further improves the film-forming property of the prepared lubricant, has ultralow critical micelle concentration, is non-toxic and easy to biodegrade, and effectively overcomes the defects of large dosage, strong toxicity, difficult biodegradation and the like of the traditional chemically synthesized surfactant.

4. The solid lubricant is added, so that the temperature resistance of the prepared lubricant can be effectively improved, the lubricant has excellent film forming property, and the frictional resistance among a drilling tool, a casing and a well wall support can be effectively reduced.

Detailed Description

The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.