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Low-fluorescent-oil-based lubricant for drilling fluid based on reclaimed oil and derivatives thereof

An oil-based lubricant, a technology for regenerating grease, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of large adsorption consumption, low lubricant dispersion, fast lubricant consumption, etc., and achieve biodegradability. Good, good dispersion, resource saving effect

Active Publication Date: 2014-11-26
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the currently commonly used vegetable oil lubricants are basically based on unmodified vegetable oils, which have at least the following three problems due to unmodified vegetable oils: (1) poor hydrolytic thermal stability, vegetable oils are easy to saponify in alkaline environments, Anionic surfactants are formed and easy to foam; (2) The adsorption consumption of water-soluble anionic surfactants on cuttings and formations is greater than that of oil-soluble grease, that is, the consumption of lubricants after saponification is fast, in other words , the lubricant after saponification is not durable; (3) Poor oxidation stability, oxidative rancidity of oil leads to odor of drilling fluid, and reduces or even loses lubricating performance
However, the price of the lubricant is relatively high, and white oil is added to the lubricant, which will have a certain impact on the environment, and the lubricant has fluorescence, which affects geological logging
[0009] Chinese patent application CN102311722A discloses a method for preparing a fatty acid lubricant for drilling fluids. The lubricant is prepared by mixing fatty acid, rice bran oil and polyol amine, wherein the rice bran oil is not defluorescently reacted, and the oxidation of rice bran oil is not improved. stability
However, the lubricant has low dispersibility and limited lubricating effect

Method used

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  • Low-fluorescent-oil-based lubricant for drilling fluid based on reclaimed oil and derivatives thereof
  • Low-fluorescent-oil-based lubricant for drilling fluid based on reclaimed oil and derivatives thereof
  • Low-fluorescent-oil-based lubricant for drilling fluid based on reclaimed oil and derivatives thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Example 1 Preparation of Low Fluorescence Oil-based Lubricant for Drilling Fluid Based on Regenerated Grease and Its Derivatives

[0045] Mix 100g of waste oil, 5g of concentrated sulfuric acid and 7g of triethanolamine to carry out esterification reaction, the reaction temperature is controlled at 140°C, and the reaction time is 4h;

[0046] Add 100g of refined fatty acid methyl ester and 20g of solid nitric acid to the reactants obtained above, and react at a temperature of 100°C for 1h to obtain a low-fluorescence oil-based lubricant for drilling fluid based on regenerated oil and its derivatives, It is a brown-black liquid.

Embodiment 2

[0047] Example 2 Preparation of Low Fluorescence Oil-based Lubricant for Drilling Fluid Based on Regenerated Grease and Its Derivatives

[0048] Mix 80g of waste oil, 5g of p-toluenesulfonic acid and 6g of triethanolamine to carry out esterification reaction, the reaction temperature is controlled at 140°C, and the reaction time is 4h;

[0049] Add 120 g of unrefined crude fatty acid methyl ester and 6 g of solid nitric acid to the reactants obtained above, and react at a temperature of 130 ° C for 1 h to obtain low fluorescent oil for drilling fluid based on regenerated oil and its derivatives base lubricant, which is a brown-black liquid.

Embodiment 3

[0050] Example 3 Preparation of Low Fluorescence Oil-based Lubricants for Drilling Fluids Based on Regenerated Grease and Its Derivatives

[0051] Mix 80g of waste oil, 5g of p-toluenesulfonic acid and 6g of triethanolamine to carry out esterification reaction, the reaction temperature is controlled at 140°C, and the reaction time is 4h;

[0052] Add 120 g of unrefined crude fatty acid methyl ester and 13 g of solid nitric acid to the reactants obtained above, and react at a temperature of 120 ° C for 3 hours to obtain low-fluorescence oil for drilling fluid based on regenerated oil and its derivatives base lubricant, which is a brown-black liquid.

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Abstract

The invention relates to a low-fluorescent-oil-based lubricant for a drilling fluid based on reclaimed oil and derivatives thereof, which is prepared through the following steps: (1) an esterification process and (2) a fluorescence disappearing process. The lubricant has favorable biodegradability and lubrication property, high oxidation resistance, excellent high-temperature-resistant lubrication property and low florescence level, and is less prone to cause fluid loss.

Description

technical field [0001] The invention relates to a lubricant for drilling fluid, in particular to a low-fluorescence oil-based lubricant for drilling fluid based on regenerated oil and derivatives thereof and a preparation method thereof. Background technique [0002] In the process of oil and gas drilling, in order to reduce the frictional resistance between the drilling tool and the well wall, the drilling tool and the casing, as well as reduce the rotational torque of the drill string and the resistance to tripping, it is often necessary to add lubricants, thereby reducing downhole sticking accidents and improving Drilling speed. [0003] Common liquid lubricants for drilling fluids include mineral oil lubricants and vegetable oil lubricants. Among them, mineral oil lubricants cannot be biodegraded, causing serious environmental pollution, and have a high level of fluorescence, which affects geological logging. Vegetable oil lubricants have the advantages of non-toxicity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035
Inventor 周风山熊正强郑祥志崔保林刘锋报王维恒
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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