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Oil-displacing agent for supercritical carbon dioxide displacement as well as preparation method and application of oil-displacing agent

A technology of carbon dioxide and oil-displacing agent, which is applied in chemical instruments and methods, bulk chemical production, and drilling compositions, etc., can solve the problems of crude oil not being recovered, small crude oil stripping effect, and narrowing of the swept range, etc. The effect of reducing gas channeling, improving oil recovery, and increasing sweep efficiency

Active Publication Date: 2022-01-14
SHANDONG DESHI CHEM IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the heterogeneity of the reservoir, after several rounds of CO2 huff and puff, the CO2 will flow along the high permeability zone or large pores in the reservoir, and the affected area will be greatly reduced; It will return along the original path of the injection hole, which causes an invalid cycle of carbon dioxide; moreover, because carbon dioxide has little effect on the stripping of crude oil adsorbed on the surface of formation rocks, there is still a large amount of remaining crude oil even after passing through the area affected by carbon dioxide cannot be mined

Method used

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  • Oil-displacing agent for supercritical carbon dioxide displacement as well as preparation method and application of oil-displacing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 Oil Displacing Agent 1#

[0041] (1) Under nitrogen protection, 40.0g of ethylene oxide and 140.0g of dipropylamine were added to 180.0g of toluene, and reacted at 75°C for 4 hours to obtain the first intermediate;

[0042] (2) Add 150.0g of the first intermediate and 100.0g of 4-pentenoic acid to 250.0g of xylene, then add 10.0g of concentrated sulfuric acid with a mass concentration of 98%, and react at 120°C for 4 hours to obtain the second intermediate body;

[0043] (3) Under nitrogen protection, add 270.0g of 5-phenyl-1-pentanol to 290.0g of ethylene glycol dimethyl ether, and add 120.0g of 50% sodium hydroxide solution at 70°C, Then 6-chloro-1-hexene was added dropwise, and a total of 120.0 g was added dropwise. After the dropwise addition was completed, the temperature was raised to 80° C. and reacted for 24 hours to obtain the third intermediate;

[0044] (4) Under nitrogen protection, add 240.0g of the second intermediate and 350.0g of the third in...

Embodiment 2

[0045] Embodiment 2 oil displacement agent 2#

[0046] The difference between Example 2 and Example 1 is that in step (1), under the protection of nitrogen, 40.0 g of ethylene oxide and 140.0 g of dibutylamine were added to 180.0 g of toluene, and reacted at 75 ° C for 4 hours , to obtain the first intermediate; the rest of the steps are the same as in Example 1 to obtain oil displacing agent 2#.

Embodiment 3

[0047] Example 3 Oil Displacing Agent 3#

[0048] The difference between Example 3 and Example 1 is that in step (2), 150.0g of the first intermediate and 100.0g of 4-phenyl-4-pentenoic acid were added to 250.0g of xylene, and then 10.0g of Concentrated sulfuric acid with a mass concentration of 98% was reacted at 120°C for 4 hours to obtain the second intermediate; the rest of the steps were the same as in Example 1 to obtain oil displacement agent 3#.

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Abstract

The invention discloses an oil-displacing agent for supercritical carbon dioxide displacement as well as a preparation method and application thereof, belonging to the field of carbon dioxide displacement oil extraction. The preparation method of the oil-displacing agent comprises the following steps: subjecting a first monomer to reacting with a second monomer to generate a first intermediate; subjecting the first intermediate to reacting with a third monomer to generate a second intermediate; subjecting a fourth monomer to reacting with a fifth monomer to obtain a third intermediate; and polymerizing the second intermediate and the third intermediate to obtain the oil-displacing agent.

Description

technical field [0001] The application relates to an oil displacement agent for supercritical carbon dioxide displacement and its preparation method and application, belonging to the field of carbon dioxide displacement oil recovery. Background technique [0002] Carbon dioxide huff and puff oil recovery technology is an important enhanced oil recovery technology, which has been widely used in oil fields such as Daqing Oilfield, Jilin Oilfield and Jidong Oilfield. Carbon dioxide huff and puff oil recovery technology refers to injecting a certain amount of carbon dioxide into the oil layer under a certain pressure, soaking the well for a period of time to make the carbon dioxide diffuse in the formation and dissolve in the crude oil, and then open the well for production. [0003] The mechanism of CO2 huff and puff oil recovery technology to enhance oil recovery is: after injecting carbon dioxide into the oil layer, the carbon dioxide will dissolve in the crude oil and format...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F216/16C08F220/34C09K8/588C09K8/594C09K8/88
CPCC08F216/165C09K8/588C09K8/594C09K8/882C08F220/34Y02P20/54
Inventor 崔仕章宋新旺郭玉玺侯云福张凤莲张荣军
Owner SHANDONG DESHI CHEM IND CO LTD
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