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Modified polyol inhibitor and preparation method and application thereof in water-based drilling fluid

A polyol and inhibitor technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of low negative effect of strong inhibitory viscosity increase, large influence on rheological properties, insufficient temperature resistance, etc. Improve the negative effect of viscosity increase, small influence on rheological properties, and reduce the effect of hydration dispersion and swelling

Active Publication Date: 2021-01-05
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention uses sulfoacid monomers to carry out cross-linking reaction with sulfonated polyols, and then carries out double cross-linking reactions with high-temperature resistant monomers to obtain modified polyol inhibitors. The modified polyol inhibitors of the present invention It has the advantages of strong inhibition, high temperature resistance and low viscosity-increasing negative effect, and overcomes the shortcomings of existing water-based drilling fluid polyol inhibitors that have a large impact on the rheological properties of drilling fluids and insufficient temperature resistance

Method used

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  • Modified polyol inhibitor and preparation method and application thereof in water-based drilling fluid
  • Modified polyol inhibitor and preparation method and application thereof in water-based drilling fluid
  • Modified polyol inhibitor and preparation method and application thereof in water-based drilling fluid

Examples

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Effect test

Embodiment 1

[0042] A preparation method for modified polyol inhibitor, comprising steps as follows:

[0043] (1) Add 5g of polyvinyl alcohol into 100mL of deionized water, stir at 90°C, the stirring speed is 3000r / min, after the polyvinyl alcohol is completely dissolved, cool the solution to 0°C, then slowly add 10g of concentrated sulfuric acid dropwise, After the dropwise addition, the system was heated up to 45°C, and stirred and reacted at 45°C for 6 hours; after the reaction was completed, the reaction mixture was added to 100 mL of absolute ethanol, filtered, and the precipitate obtained was washed with absolute ethanol until the pH of the filtrate was 6.0; then the obtained white precipitate was dried in a vacuum oven at 40° C. for 12 hours to obtain sulfonated polyvinyl alcohol.

[0044](2) Add 1 g of sulfonated polyvinyl alcohol prepared in step (1) into 10 mL of deionized water, stir at 90° C. for 5 h to obtain a sulfonated polyvinyl alcohol solution, and then cool the obtained ...

Embodiment 2

[0048] A preparation method for modified polyol inhibitor, comprising steps as follows:

[0049] (1) Add 6g of polyvinyl alcohol into 100mL of deionized water, stir at 90°C, the stirring speed is 3000r / min, after the polyvinyl alcohol is completely dissolved, cool the solution to 0°C, then slowly add 12g of concentrated sulfuric acid dropwise, After the dropwise addition, the system was warmed up to 45°C, and stirred and reacted at 45°C for 6 hours; after the reaction was completed, the reaction mixture was added to 100 mL of absolute ethanol, filtered, and the obtained precipitate was washed with absolute ethanol until the pH of the filtrate was 6.0; then the obtained white precipitate was dried in a vacuum oven at 40° C. for 12 hours to obtain sulfonated polyvinyl alcohol.

[0050] (2) Add 2 g of the sulfonated polyvinyl alcohol prepared in step (1) into 10 mL of deionized water, stir at 90° C. for 5 h to obtain a sulfonated polyvinyl alcohol solution, and then cool the obta...

Embodiment 3

[0054] A preparation method for modified polyol inhibitor, comprising steps as follows:

[0055] (1) Add 6g of polyvinyl alcohol into 100mL of deionized water, stir at 90°C, the stirring speed is 3000r / min, after the polyvinyl alcohol is completely dissolved, cool the solution to 0°C, then slowly add 12g of concentrated sulfuric acid dropwise, After the dropwise addition, the system was warmed up to 45°C, and stirred and reacted at 45°C for 6 hours; after the reaction was completed, the reaction mixture was added to 100 mL of absolute ethanol, filtered, and the obtained precipitate was washed with absolute ethanol until the pH of the filtrate was 6.0; then the obtained white precipitate was dried in a vacuum oven at 40° C. for 12 hours to obtain sulfonated polyvinyl alcohol.

[0056] (2) Add 2 g of the sulfonated polyvinyl alcohol prepared in step (1) into 10 mL of deionized water, stir at 90° C. for 5 h to obtain a sulfonated polyvinyl alcohol solution, and then cool the resu...

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Abstract

The invention provides a modified polyol inhibitor as well as a preparation method and an application thereof in water-based drilling fluid. The sulfonic acid monomers and sulfonated polyvinyl alcoholare subjected to a cross-linking reaction, an obtained product, high-temperature-resistant monomers and amide monomers are subjected to a double-cross-linking reaction, and the modified polyol inhibitor is obtained. The modified polyol inhibitor provided by the invention can significantly improve the tackifying negative effect of polyol, does not destroy the performance of the drilling fluid, haslittle influence on the rheological property of the drilling fluid, and has very strong inhibition property and excellent temperature resistance; the defects that an existing water-based drilling fluid polyhydric alcohol inhibitor has large influence on the rheological property of the drilling fluid and is insufficient in temperature resistance are overcome.

Description

technical field [0001] The invention relates to a modified polyol inhibitor, its preparation method and its application in water-based drilling fluid, belonging to the field of oilfield chemistry in the petroleum industry. Background technique [0002] Mud shale is a heterogeneous body composed of clay and non-clay minerals with different hydration expansion characteristics. Due to the different hydration stresses produced by various minerals, after the filtrate invades the formation, internal stress will be formed inside the formation, affecting The well wall is stable. One of the effective ways to solve wellbore instability is to reduce the drilling fluid filtrate entering the collapsed formation, and effectively inhibit the hydration expansion of clay minerals in the formation, which causes the formation collapse pressure to increase and the fracture pressure to decrease. Although oil-based drilling fluid has unique advantages in solving wellbore stability, its cost is h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F8/36C08F16/06C08F220/58C08F222/38
CPCC09K8/035C08F8/36C08F220/585C09K2208/12C08F16/06C08F222/385
Inventor 赵贤正付大其周宝义吕开河蒲秀刚牟连刚卓绿燕张海军刘敬平尤志良黄贤斌韩文中张伟
Owner PETROCHINA CO LTD
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