A kind of composite oil displacement agent used for enhancing carbon dioxide flooding oil recovery and its preparation method and application

A combined oil displacement and carbon dioxide technology, applied in chemical instruments and methods, drilling compositions, and production fluids, etc., can solve the problems of ineffective mixing of carbon dioxide and surfactants, reduce gas channeling, reduce interface Tension, the effect of improving the degree of miscibility

Active Publication Date: 2022-01-11
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 enhancing the recovery of carbon dioxide flooding 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. Injection into the formation, thereby avoiding the problem of ineffective mixing of carbon dioxide and surfactants caused by gravity differentiation during staged injection; surfactants migrate together with supercritical carbon dioxide, fully contacting the crude oil in the reservoir to play a role The viscosity-reducing effect improves the utilization efficiency of supercritical carbon dioxide and surfactant, and greatly improves 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 rest of the conditions were the same as 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 application discloses a composite oil displacement agent for enhancing oil recovery and its preparation method and application, belonging to the technical field of carbon dioxide displacement. The composite oil displacement agent is obtained after mixing supercritical carbon dioxide and a surfactant with a weight ratio of (100‑1000): 1; wherein, the preparation method of the surfactant comprises the following steps: in formic acid, the first The monomer reacts with formaldehyde to obtain the first reactant; the second monomer reacts with the acid chloride to obtain the second reactant; under the initiator, the first reactant and the second reactant are polymerized to obtain the surface active agent; wherein the first monomer is selected from 3-phenyl-4-pentene-1-amine, 4-pentene-1-amine, 4-methyl-pentene-1-amine and 2-amino At least one of 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 used for enhancing the recovery rate of carbon dioxide flooding 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 ha...

Claims

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Application Information

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Patent Type & Authority Patents(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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