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Nano lubricant for drilling fluid as well as preparation method and application of nano lubricant

A lubricant and drilling fluid technology, applied in the field of nano-lubricant for drilling fluid and its preparation, can solve the problems of inapplicability, high temperature resistance, poor lubricating performance effect, etc., so as to reduce frictional resistance, improve high temperature resistance, and improve Effects of Dispersion and Stabilization

Active Publication Date: 2021-08-17
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above deficiencies, the purpose of the present invention is to provide a nano lubricant for drilling fluid and its preparation method and application, which can effectively solve the problems of low temperature resistance, poor lubricating performance and inability to be used in existing lubricants for drilling fluid. Problems with deep and ultra-deep drilling fluids

Method used

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  • Nano lubricant for drilling fluid as well as preparation method and application of nano lubricant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This example provides a kind of preparation method of nano-lubricant for drilling fluid, specifically comprises the following steps: 2 Add 25 g of sodium 2-acrylamide-2-methylpropanesulfonate and 5 g of vinyl tetrafluoroacetate (mass ratio: 5:1) to the three-necked flask at the entrance, add 175 mL of water and N,N-dimethylformethane The mixed solvent of amides (wherein water content is 94wt%), mixing and stirring 5min; N 2 Under a gas atmosphere, add ammonium persulfate to it, whose mass accounts for 0.5wt% of the total amount of monomers, then heat up to 94°C and react at a constant temperature for 5 hours, then cool to room temperature, and add 2.5 times of volume of ethanol, fully stirred and then filtered, and then the filtrate was vacuum-dried at 60° C. for 8 hours to obtain a nano-lubricant for drilling fluid (product purity: 97%).

[0030] The TEM image of the nano-lubricant used in drilling fluid made in this example is as follows figure 1 shown by figure 1 ...

Embodiment 2

[0032] This example provides a kind of preparation method of nano-lubricant for drilling fluid, specifically comprises the following steps: 2 Add 23g of sodium vinylsulfonate and 2.3g of trifluoroethyl acrylate (mass ratio is 10:1) successively in the three-necked bottle of entrance, add the mixed solvent of 180mL water and N-methylpyrrolidone (wherein water content is 95wt% ), mixed and stirred for 5min; N 2 Under the gas atmosphere, add ammonium persulfate thereinto, its mass accounts for 1.5wt% of the total amount of monomers, start to heat up to 85°C and react at a constant temperature for 3h, then cool to room temperature, add 2.3 times to the mixed solution obtained after the reaction is completed volume of ethanol, fully stirred and then filtered, and then the filtrate was vacuum-dried at 50° C. for 8 hours to obtain a nano-lubricant for drilling fluid (product purity: 95%).

Embodiment 3

[0034] This example provides a kind of preparation method of nano-lubricant for drilling fluid, specifically comprises the following steps: 2 Add 30 g of sodium styrene sulfonate and 2 g of propylene trifluoroacetate (15:1 in mass ratio) successively in the three-necked flask at the entrance, and add 275 mL of a mixed solvent of water and dimethyl sulfoxide (wherein the water content is 96 wt %) Mix and stir for 5min; N 2 Under the atmosphere of gas, add ammonium persulfate thereinto, its mass accounts for 2wt% of monomer total amount, begin to heat up to 80 ℃ and constant temperature reaction 4h after cooling to room temperature, add 2.8 times of volume to the mixed solution obtained after the reaction is completed ethanol, fully stirred and filtered, and then the filtrate was vacuum-dried at 74° C. for 10 hours to obtain a nano-lubricant for drilling fluid (product purity: 98%).

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Abstract

The invention discloses a nano lubricant for drilling fluid and a preparation method and application thereof, and the preparation method mainly comprises the following steps: adding an anionic monomer, a fluorine-containing monomer and a solvent into a reaction device, uniformly stirring, then adding an initiator in an inert gas atmosphere for reaction, cooling to room temperature after the reaction is finished, and then carrying out post-treatment to obtain the nano lubricant for drilling fluid. The preparation method has the characteristics of simple preparation route, mild reaction conditions, high product purity, simple post-treatment operation and easy realization of large-scale production; the surface of the nano lubricant is provided with an anionic functional group and a fluorine-containing functional group, the anionic functional group and the fluorine-containing functional group have a synergistic effect to reduce the frictional resistance between the drilling fluid and a well wall, the lubricating property is obviously improved, the nano lubricant has dispersion stability and lubricating property, and when the addition amount of the nano lubricant in the drilling fluid is 1%, the reduction rate of the lubricating coefficient is greater than 81%; meanwhile, by introducing fluorine-containing functional groups, the high-temperature-resistant performance is achieved, and the temperature resistance reaches 195 DEG C or above.

Description

technical field [0001] The invention relates to the technical field of lubricants, in particular to a nano lubricant for drilling fluid and its preparation method and application. Background technique [0002] Drilling fluid lubricants are mainly used in the drilling process to reduce the flow resistance of the drilling fluid and the friction coefficient of the filter cake, reduce the torque of the drill bit, increase its water horsepower, and prevent the drill from sticking. As the exploration and development of oil and gas resources advances to complex geological conditions such as deep and ultra-deep layers, the working environment faced by drilling fluids is getting worse and worse. In the process of deep and ultra-deep drilling, the friction of drilling tools becomes more prominent, and the role of lubricant becomes more and more important, and even becomes a key factor restricting the smooth drilling of deep and ultra-deep drilling fluids. [0003] At present, common ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F218/04C08F228/02C08F220/24C08F212/14C08F218/12C09K8/035
CPCC08F220/585C08F228/02C08F212/30C09K8/035C09K2208/34C09K2208/10C08F218/20C08F220/24
Inventor 武元鹏鲁红升黄志宇李振宇王犁赵春霞向东
Owner SOUTHWEST PETROLEUM UNIV
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