Environment-friendly high-temperature-resistant and high-salt-resistant lubricant for water-based drilling fluid as well as preparation method and application thereof

A water-based drilling fluid and environment-friendly technology, applied in the field of drilling, can solve the problems of reducing the lubrication coefficient of the drilling fluid, large supporting pressure of frictional resistance, etc., and achieve the effect of reducing the friction coefficient, ensuring stability, and strong high temperature stability.

Active Publication Date: 2022-07-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lubricant of the present invention can effectively reduce the lubrication coefficient of drilling fluid under high temperature and high salinity conditions, and has good environmental protection and biodegradability. It can be applied to drilling wells with complex structures in deep formations and solves the problem of drilling deep horizontal wells with existing water-based drilling fluids. The problems of high friction and serious supporting pressure in the process of high-inclination wells, etc.

Method used

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  • Environment-friendly high-temperature-resistant and high-salt-resistant lubricant for water-based drilling fluid as well as preparation method and application thereof
  • Environment-friendly high-temperature-resistant and high-salt-resistant lubricant for water-based drilling fluid as well as preparation method and application thereof
  • Environment-friendly high-temperature-resistant and high-salt-resistant lubricant for water-based drilling fluid as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of an environment-friendly high-temperature and high-salt-resistant lubricant for water-based drilling fluid, comprising the following steps:

[0028] (1) add a certain amount of sorbitol in the four-necked flask equipped with reflux condenser, agitator, start stirring, add boric acid after being warming up to 150 ℃, the mol ratio of sorbitol and boric acid is 1:1; Nitrogen was introduced, and the reaction was incubated at 150 °C for 2 h to obtain an intermediate product.

[0029] (2) under 150 ℃, directly in step (1) gained intermediate product, add lauric acid and sodium hydroxide (the added quality of sodium hydroxide is 0.3% of lauric acid quality), the mol ratio of lauric acid and boric acid is 1 : 1; raise the temperature to 190°C, react for 2 hours, and naturally cool to room temperature to obtain an environmentally friendly high-temperature and high-salt-resistant lubricant for water-based drilling fluid, denoted as Lubricant A 1 .

Embodiment 2

[0031] A preparation method of an environment-friendly high-temperature and high-salt-resistant lubricant for water-based drilling fluid, comprising the following steps:

[0032] (1) add a certain amount of xylitol in the four-necked flask equipped with reflux condenser and agitator, start stirring, add boric acid after being warming up to 160 ° C, the mol ratio of xylitol and boric acid is 2:1; Nitrogen was introduced, and the reaction was incubated at 160 °C for 3 h to obtain an intermediate product.

[0033] (2) under 160 ℃, directly in step (1) gained intermediate product, add stearic acid and sodium hydroxide (the added quality of sodium hydroxide is 0.4% of stearic acid quality), the mole of stearic acid and boric acid The ratio is 2:1; the temperature is raised to 200°C, the reaction is carried out for 3 hours, and then cooled to room temperature naturally to obtain an environmentally friendly high-temperature and high-salt-resistant lubricant for water-based drilling f...

Embodiment 3

[0035] A preparation method of an environment-friendly high-temperature and high-salt-resistant lubricant for water-based drilling fluid, comprising the following steps:

[0036] (1) add a certain amount of pentaerythritol in the four-necked flask equipped with reflux condenser, agitator, start stirring, add boric acid after being warming up to 170 ℃, the mol ratio of pentaerythritol and boric acid is 3:1; The reaction was incubated at 170 °C for 4 h to obtain an intermediate product.

[0037] (2) at 170 DEG C, directly add oleic acid and catalyst sodium hydroxide (the addition of sodium hydroxide is 0.5% of the quality of oleic acid) in the intermediate product obtained in step (1), and the mol ratio of oleic acid and boric acid is 3:1; raise the temperature to 210°C, react for 4 hours, and naturally cool to room temperature to obtain an environmentally friendly high-temperature and high-salt-resistant lubricant for water-based drilling fluid, denoted as Lubricant A 3 .

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Abstract

The invention provides an environment-friendly high-temperature-resistant and high-salt-resistant lubricant for water-based drilling fluid and a preparation method and application thereof.The preparation method comprises the following steps that polyhydric alcohol is heated to a first reaction temperature, boric acid is added, a heat preservation reaction is conducted under nitrogen protection, and an intermediate product is obtained; directly adding long-chain fatty acid and a catalyst into the obtained intermediate product, and heating to a second reaction temperature for reaction; and after the reaction is finished, cooling to obtain the environment-friendly high-temperature-resistant and high-salt-resistant lubricant. The lubricant can effectively reduce the lubrication coefficient of the drilling fluid under the conditions of high temperature and high salt, is good in environmental protection property and biodegradability, can be applied to drilling of a deep stratum complex structure well, and solves the problems of large friction resistance and serious backing pressure in the process of drilling a deep horizontal well, a highly-deviated well and the like by using the existing water-based drilling fluid.

Description

technical field [0001] The invention relates to an environment-friendly high-temperature-resistant and high-salt-resistant lubricant for water-based drilling fluid and a preparation method thereof, which has application and belongs to the technical field of drilling. Background technique [0002] At present, my country's demand for oil and natural gas is increasing rapidly, and the dependence on crude oil and natural gas is increasing year by year, and new oil and gas replacement resources are urgently needed. my country is rich in deep oil and gas resources, and its efficient development is crucial to ensuring national energy security. The structure of the deep formation is complex. During the drilling process, the frictional resistance and torque between the drilling tool and the well wall or between the drilling tool and the casing are increasing. During the drilling process, the drilling tool wears seriously, the drilling speed is reduced, and the pipe sticking is easy t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/22
CPCC09K8/035C09K8/22C09K2208/34
Inventor 刘敬平王宗轮孙金声吕开河张宪法黄贤斌王金堂白英睿金家锋黎剑史胜龙
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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