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High-temperature-resistant pH-responsive wetting agent as well as preparation and application methods thereof

An application method and a responsive technology, applied in the field of drilling fluid, can solve problems such as not being able to meet the preparation requirements of reversible emulsified drilling fluid, and achieve the effects of improving suspension stability, good rheology, and low fluid loss

Active Publication Date: 2021-07-16
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology cannot meet the density of 2.3g / cm 3 The above preparation requirements of reversible emulsified drilling fluid, this invention is specially proposed

Method used

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  • High-temperature-resistant pH-responsive wetting agent as well as preparation and application methods thereof
  • High-temperature-resistant pH-responsive wetting agent as well as preparation and application methods thereof
  • High-temperature-resistant pH-responsive wetting agent as well as preparation and application methods thereof

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Experimental program
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Effect test

Embodiment 1

[0053] Typical embodiment 1: The preparation method of a kind of anti-high temperature pH response type wetting agent mentioned in the present invention, comprises the following steps:

[0054] Add 20g of dodecane chloride, 30g of isopropanol, and 10g of ethanol into the reaction kettle, heat it to 85°C under stirring conditions, slowly drop in 11g of tetramethylethylenediamine, and add 200g of dimethyl Amine solution (40%), 40g sodium hydroxide, raise the temperature to 95°C, after 10 hours of reaction, lower the temperature to 55°C, add 2g of ethylenediaminetetraacetic acid, 3g of 30% hydrogen peroxide solution, and react for 4h. After the reaction, add hydrochloric acid to adjust the pH value of the solution to 7-8, add chloroform to extract, and finally recrystallize with acetone to obtain the product, which is the high-temperature resistant pH-responsive wetting agent mentioned in the present invention, and the substitution number is SLRSJ-1.

[0055] The present inventi...

Embodiment 2

[0057] Add 50g of diesel oil, 4g of reversible emulsifier, and 30g of 20% calcium chloride aqueous solution to the high-speed mixer in turn, heat the water bath to 50°C, stir the high-speed mixer at 5000 rpm for 40 minutes, and then add organic soil in turn 1.5g, pH responsive wetting agent (SLRSJ-1) 1.0g, oil-based fluid loss reducer 3g, calcium oxide 0.5g and barite, the addition of barite makes the density of reversible emulsified drilling fluid up to 2.5 g / cm 3 and continue stirring for 60 minutes to obtain the high-density reversible emulsified drilling fluid.

Embodiment 3

[0059] Add 50g of white oil, 4g of reversible emulsifier, 30g of 20% calcium chloride aqueous solution to the high-speed mixer in turn, heat the water bath to 50°C, stir the high-speed mixer at 5000 rpm for 40 minutes, and then add organic Soil 1.5g, pH responsive wetting agent (SLRSJ-1) 1.0g, oil-based fluid loss reducer 3g, calcium oxide 0.5g and barite, the addition of barite makes the density of the reversible emulsified drilling fluid the highest 2.5g / cm 3 and continue stirring for 60 minutes to obtain the high-density reversible emulsified drilling fluid.

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Abstract

The invention provides a high-temperature-resistant pH-responsive wetting agent and preparation and an application methods thereof, and the technical scheme is as follows: 20 parts of chlorododecane, 30 parts of isopropanol and 10 parts of ethanol are added into a reaction kettle, heated to 85 DEG C under a stirring condition, 11 parts of tetramethylethylenediamine is slowly dropped, 200 parts of a dimethylamine solution (40%) and 40 parts of sodium hydroxide are added after reaction for 4 hours, the temperature is increased to 95 DEG C, after reacting for 10 hours, the temperature is reduced to 55 DEG C, 2 parts of ethylenediamine tetraacetic acid and 3 parts of 30% hydrogen peroxide solution are added, and reacted for 4 hours; after the reaction is finished, hydrochloric acid is added to adjust the pH value of the solution to 7-8, trichloromethane is added for extraction, and finally, acetone is used for recrystallization to obtain a product, namely the high-temperature-resistant pH-responsive wetting agent provided by the invention. According to the high-temperature high-density reversible emulsified drilling fluid prepared by using the high-temperature-resistant pH-responsive wetting agent provided by the invention, the highest temperature can reach 150 DEG C, and the highest density can reach 2.5 g / cm <3>.

Description

technical field [0001] The invention relates to the technical field of drilling fluids, in particular to a high-temperature resistant pH-responsive wetting agent and its preparation and application methods. Background technique [0002] Compared with water-based drilling fluids, oil-based drilling fluids have unique advantages in inhibition, wellbore stability, and performance maintenance. ground application. However, oil-based drilling fluid has problems such as difficult removal of filter cake, oil-based drilling cuttings and oily waste, which limit its popularization and application. [0003] The reversible emulsified drilling fluid uses emulsion phase inversion technology to realize the mutual conversion between the water-in-oil type and the oil-in-water type of drilling fluid, so that the drilling fluid has both the advantages of oil-based drilling fluid and water-based drilling fluid: Drilling It is a water-in-oil drilling fluid, which has the advantages of strong in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/28C09K8/36C09K8/03
CPCC09K8/265C09K8/28C09K8/36C09K8/03
Inventor 石亚男王旭东郭保雨杨龙波李蕾王俊王金利李秀灵
Owner 中石化石油工程技术服务有限公司
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