Composite oil-displacing agent for improving recovery efficiency as well as preparation method and application of composite oil-displacing agent

A composite flooding and recovery technology, which is applied to drilling compositions, chemical instruments and methods, and production fluids, etc., can solve the problems that carbon dioxide and surfactants cannot be effectively mixed, and reduce the phenomenon of gas channeling. The effect of enhanced oil recovery and enhanced oil recovery

Active Publication Date: 2021-11-09
DESHI ENERGY TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, a composite oil displacement agent for enhanced oil recovery and its preparation method and application are provided. The composite oil displacement agent mixes supercritical carbon dioxide and a surfactant as an oil displacement agent and injects it into the formation , so as to avoid the problem that carbon dioxide and surfactant cannot be effectively mixed due to gravity differentiation during staged injection; surfactant and supercritical carbon dioxide migrate together to fully contact the crude oil in the reservoir to exert the effect of reducing viscosity , improve the utilization efficiency of supercritical carbon dioxide and surfactant, and greatly increase the recovery factor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 Surfactant 1#

[0035] (1) in N 2 Under protection, 27.6g of formic acid, 9.0g of formaldehyde and 8.5g of 4-penten-1-amine were added to 95mL of DMF, and refluxed at 95°C for 21h to obtain the first reactant;

[0036] (2) in N 2 Under protection, 7.0g 1-pentene and 0.03g AlCl 3 Add it into 50mL of dichloromethane, add butyryl chloride dropwise under the condition of 0-5°C ice bath, and add 11.0g dropwise in total. After the dropwise addition is completed, raise the temperature to 25°C, and react for 2.5h to obtain the second reactant;

[0037] (3) in N 2 Under protection, 11.0 g of the first reactant and 14.0 g of the second reactant were added to 50 mL of hexane, the temperature was raised to 70° C., 0.2 g of azobisisobutyronitrile was added, and after 3 hours of reaction, surfactant 1# was obtained.

Embodiment 2

[0038] Embodiment 2 Surfactant 2#

[0039] The difference between embodiment 2 and embodiment 1 is that in step (1), in N 2 Under protection, 27.6g of formic acid, 9.0g of formaldehyde and 16.0g of 3-phenyl-4-penten-1-amine were added to 160mL of DMF, and refluxed at 95°C for 21h to obtain the first reactant; the remaining conditions were the same as those in the examples 1 is the same to obtain surfactant 2#.

Embodiment 3

[0040] Embodiment 3 Surfactant 3#

[0041] The difference between embodiment 3 and embodiment 1 is that in step (2), in N 2 Under protection, 7.0g cyclopentene and 0.03g AlCl 3Add it into 50mL of dichloromethane, add butyryl chloride dropwise under the condition of 0-5°C ice bath, add dropwise 11.0g in total, after the dropwise addition is completed, raise the temperature to 25°C, and react for 2.5h to obtain the second reactant; Condition is identical with embodiment 1, obtains surfactant 3#.

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PUM

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Abstract

The invention discloses a composite oil-displacement agent for improving the recovery efficiency and a preparation method and application thereof, and belongs to the technical field of carbon dioxide displacement. The composite oil-displacing agent is obtained by mixing supercritical carbon dioxide and a surfactant according to a weight ratio of (100-1000): 1, the preparation method of the surfactant comprises the following steps: in formic acid, reacting a first monomer with formaldehyde to obtain a first reactant; reacting a second monomer with acyl chloride to obtain a second reactant; in the presence of an initiator, carrying out polymerization reaction on the first reactant and the second reactant to obtain the surfactant, wherein the first monomer is selected from at least one of 3-phenyl-4-pentene-1-amine, 4-pentene-1-amine, 4-methyl-pentene-1-amine and 2-amino-4-pentenoic acid, the second monomer is at least one of 1-butene, 1-pentene, 1-hexene and cyclopentene.

Description

technical field [0001] The application relates to a composite oil displacement agent for enhancing oil recovery and its preparation method and application, belonging to the technical field of carbon dioxide displacement. Background technique [0002] With the increase of world energy demand, the rational development and utilization of oil has attracted great attention, and the requirements for the amount and efficiency of oil extraction are also getting higher and higher. Realizing the efficient exploitation of oil and gas resources not only has practical significance for increasing crude oil production, but also has important strategic significance. Conventional oil recovery methods (primary method and secondary method) generally only recover 1 / 3 of the crude oil geological reserves, and about 2 / 3 of the crude oil has not been recovered. Therefore, in the case of increasingly tense energy sources, enhanced crude oil recovery The rate has become a major topic in oil explora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C08F210/14C08F232/04C08F226/02E21B43/22
CPCC09K8/584C08F210/14C08F232/04E21B43/16C08F226/02Y02P20/54
Inventor 崔仕章宋新旺王黎明侯云福郭鑫马丽
Owner DESHI ENERGY TECH GRP CO LTD
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