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A temperature-responsive aluminum-based plugging treatment agent for drilling fluid and its preparation method

A temperature response, drilling fluid technology, applied in chemical instruments and methods, drilling composition, etc., can solve problems such as reducing the reaction ability of entering formation and formation clay minerals, limiting application scope and performance, and outstanding compatibility problems. , to achieve the effect of enhancing wellbore stability, improving wellbore stability, and simple preparation method

Active Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned aluminum-based treatment agents mainly exist in the form of non-water-soluble in the drilling fluid environment, and the compatibility problem is prominent, which reduces its ability to enter the formation and the reaction ability of clay minerals in the formation, affects the anti-slump effect, and limits its application range and performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 400mL of acetone, 13.206g of polyethylene glycol (molecular weight 2000) and 4.5211g of AlCl in a dry three-necked flask with a stirrer, condenser and dropping funnel 3 ·6H 2 O, 10g of Al 2 (SO 4 ) 3 ·16H 2 O, add 22.1496g of toluene diisocyanate (TDI) in the dropping funnel. The three-necked flask was heated to 82° C. in a water bath, and vacuumized for 2 hours while heating to remove moisture. Under nitrogen protection, 0.038 g of dibutyltin dilaurate was added, the toluene diisocyanate (TDI) in the dropping funnel was dropped into the three-necked flask, and the reaction was continued for 6 hours under stirring to obtain a milky white liquid. Use 20% KOH solution to adjust the pH of the milky white liquid to 7.5, distill under reduced pressure, and remove the reaction solvent acetone to obtain the target product.

Embodiment 2

[0028] Add 350mL of 1,4-dioxane, 10.2250 polyethylene glycol (molecular weight 4000) and 12.3221g KAl (SO 4 ) 2 12H 2O, add 22.1496g of dicyclohexylmethane diisocyanate (HMDI) in the dropping funnel. The three-necked flask was heated to 76° C. in a water bath, and vacuumized for 2 hours while heating to remove moisture. Under nitrogen protection, 0.048 g of stannous octoate was added, and the dicyclohexylmethane diisocyanate (HMDI) in the dropping funnel was dropped into the three-necked flask, and the reaction was continued for 7.5 hours under stirring conditions to obtain a milky white liquid. Adjust the pH of the milky white liquid to 8.0 with 20% KOH solution, distill under reduced pressure, remove the reaction solvent acetone, and obtain the target product.

Embodiment 3

[0030] Add 400mL tetrahydrofuran, 13.206g polyethylene glycol (molecular weight 1000) and 10.251g KAl(SO 4 ) 2 12H 2 O, add 22.1496g of isophorone diisocyanate (IPDI) in the dropping funnel. The three-neck flask was heated to 60° C. in a water bath, and vacuumized for 2 hours while heating to remove moisture. Under nitrogen protection, 0.016 g of dibutyltin dilaurate was added, and the isophorone diisocyanate (IPDI) in the dropping funnel was dropped into the three-necked flask, and the reaction was continued for 8 hours under stirring to obtain a milky white liquid. Adjust the pH of the milky white liquid to 7.0 with 20% KOH solution, distill under reduced pressure, remove the reaction solvent acetone, and obtain the target product.

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Abstract

The invention relates to a temperature-responsive aluminum-based plugging treatment agent for drilling fluid in the field of chemical additives for drilling and a preparation method thereof; the temperature-responsive aluminum-based plugging treatment agent for drilling fluid comprises polyethylene glycol, Components including isocyanates and aluminum compounds are used as raw materials, dissolved in organic solvents, and synthesized by a one-pot method under the action of a catalyst. The treatment agent can effectively seal micro-fractures in the formation and enhance the stability of the well wall; the temperature-responsive aluminum-based plugging treatment agent for drilling fluid is a liquid type, which is easier to use and does not cause dust problems, and can effectively improve drilling performance. The plugging property of fluid can be improved, and the wellbore stability of formation containing micro-fractures can be improved under the condition of multi-gradient temperature difference; moreover, the preparation method of the plugging treatment agent is simple, easy to operate, and easy to industrialize.

Description

technical field [0001] The invention relates to the field of chemical additives for drilling, and more particularly relates to a temperature-responsive aluminum-based plugging treatment agent for drilling fluid and a preparation method thereof. Background technique [0002] As the formation conditions encountered become more and more complex, drilling operations have higher and higher requirements on the anti-slump performance of drilling fluid and the ability to strengthen the wellbore wall. The plugging and anti-collapse treatment agent can block the primary pores and micro-cracks of the formation, block the hydration channels, improve the plugging ability of the drilling fluid, reduce the free water in the drilling fluid from invading the formation, and reduce the collapse pressure of the formation to stabilize the well. The role of the wall. The plugging and anti-slump treatment agents mainly include asphalt treatment agents, silicates and polymer alcohols and other tre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/508C08G18/48C08G18/76C08G18/75C08G18/73
CPCC09K8/035C09K8/5086C09K8/5755C08G18/4833C08G18/7614C08G18/755C08G18/73C09K2208/12
Inventor 林永学孔勇金军斌刘贵传杨帆徐江杨小华褚奇
Owner CHINA PETROLEUM & CHEM CORP
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