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A carbon dioxide thickener for medium and high permeability reservoirs and its preparation method

A carbon dioxide and thickening agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of polluted medium and high permeability reservoirs and water resources, expensive fluorine-containing thickeners, and unfavorable industrial applications. , to achieve the effect of increasing free volume and mixing entropy, good thickening effect, and slowing down the phenomenon of gas channeling

Active Publication Date: 2022-03-08
DESHI ENERGY TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although fluorine-containing polymers have excellent thickening effects when used as thickeners, they are prone to interact with groundwater and remain in reservoirs, contaminate medium-high permeability reservoirs and water resources, and then circulate in the biosphere, thereby damaging the environment. biosphere accumulation
In addition, fluorine-containing thickeners are expensive and costly to use, which is not conducive to industrial applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 Thickener 1#

[0038] (1) Under the protection of nitrogen, add 120.0g propyl 4-pentenoate, 300.0g dibutylamine and 50.0g formaldehyde to 470.0g absolute ethanol, then add 5.0g zinc fluoroborate to adjust the pH to 5, Then the temperature was raised to 80°C, and the first intermediate was obtained after stirring for 6 hours;

[0039] (2) Under the protection of nitrogen, add 240.0g of the first intermediate to 360.0g of isopropanol, raise the temperature to 90°C while stirring, add dropwise 120.0g of propane sultone, and react at constant temperature for 4h After that, the second intermediate is obtained;

[0040] (3) Under the protection of nitrogen, add 160.0g of 3-phenyl-4-penten-1-amine to 280.0g of pyridine, ice-bath, add valeryl chloride dropwise, add 120.0g dropwise, and react for 7h to get third intermediate;

[0041] (4) Under the protection of nitrogen, add 320.0g of the second intermediate and 280.0g of the third intermediate to 600.0g of n-hexan...

Embodiment 2

[0042] Embodiment 2 Thickener 2#

[0043] The difference between Example 2 and Example 1 is that in step (1), under nitrogen protection, 120.0 g of methyl 3-pentenoate, 300.0 g of dibutylamine and 50.0 g of formaldehyde were added to 470.0 g of anhydrous In ethanol, then add 5.0 g of zinc fluoroborate to adjust the pH to 5, then raise the temperature to 80° C., stir and react for 6 hours to obtain the first intermediate; other conditions are the same as in Example 1 to obtain thickener 2#.

Embodiment 3

[0044] Embodiment 3 Thickener 3#

[0045]The difference between Example 3 and Example 1 is that in step (1), under nitrogen protection, 120.0 g of 4-pentenoic acid propyl ester, 300.0 g of dihexylamine and 50.0 g of formaldehyde were added to 470.0 g of anhydrous In ethanol, 5.0 g of zinc fluoroborate was added to adjust the pH to 5, and then the temperature was raised to 80° C., and the first intermediate was obtained after stirring for 6 hours; other conditions were the same as in Example 1 to obtain thickener 3#.

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PUM

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Abstract

The present application discloses a carbon dioxide thickener for medium and high permeability oil reservoirs and a preparation method thereof. The preparation method includes the following steps: reacting a first monomer, a second monomer and a third monomer to obtain a first intermediate, and reacting the first intermediate with propane sultone to obtain a second intermediate The fourth monomer is reacted with the acid chloride to obtain the third intermediate; the second intermediate and the third intermediate are subjected to a polymerization reaction under an initiator to obtain the thickener.

Description

technical field [0001] The application relates to a carbon dioxide thickener for medium and high permeability oil reservoirs and a preparation method thereof, belonging to the technical field of carbon dioxide oil recovery. Background technique [0002] Supercritical carbon dioxide flooding is an oil recovery technology with great development potential. The density of the oil flooding system is lower than that of crude oil, and it can produce a floating effect inside the formation. There is a strong interaction between them. However, the supercritical carbon dioxide recovery technology has gradually exposed some problems during its use, such as premature gas breakthrough, small swept volume and high minimum miscible pressure, etc., which limit its application in the production of medium and high permeability reservoirs. [0003] In order to solve this problem, researchers have carried out a lot of research on thickeners, and the research hotspots are mainly fluorine-contain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/38C08F226/02C09K8/588C09K8/594C09K8/88
CPCC08F220/387C09K8/588C09K8/594C09K8/882C08F226/02
Inventor 崔仕章宋新旺崔盈贤刘小芳郑志微丁松松李欣泽
Owner DESHI ENERGY TECH GRP CO LTD
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