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A kind of nano-emulsion oil displacement agent and preparation method thereof

An oil-displacing agent and nanotechnology, which is applied in the field of nano-emulsion oil-displacing agent and its preparation, can solve the problems such as complicated preparation process, and achieve the effect of simple synthesis process, wide application range and low processing difficulty

Active Publication Date: 2022-06-03
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of studies have shown that amphiphilic nanoparticles can be obtained by pre-prepared precursors and surface modification methods, but multi-step methods are often used, and the preparation process is cumbersome.

Method used

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  • A kind of nano-emulsion oil displacement agent and preparation method thereof
  • A kind of nano-emulsion oil displacement agent and preparation method thereof
  • A kind of nano-emulsion oil displacement agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Preparation of nano-emulsion oil-displacing agent 1

[0037] 30g of absolute ethanol, 4g of ammonia water with a mass concentration of 25%, and 4g of distilled water were sequentially added to the three-necked flask equipped with a stirrer, sealed, and quickly stirred and uniformly mixed in a water bath at room temperature; The ethyl ester was quickly added to the three-necked flask; then 44g of ethanol solution dissolved with 0.8g of oleic acid and 2.6g of cocamide polyoxyethylene ether was added dropwise to the three-necked flask at a constant speed for 1h through a dropping funnel under a water bath condition at room temperature. Rapid stirring during the dropwise addition ensures that the reaction system is evenly mixed; after the dropwise addition, the reaction is stirred in a water bath at room temperature for 24 hours. After the reaction is completed, the reaction product is suction filtered to collect the solid product, dried in a vacuum at 50 °C and gro...

Embodiment 2

[0038] Example 2: Preparation of nano-emulsion oil-displacing agent 2

[0039] 50g of absolute ethanol, 2.4g of ammonia water with a mass concentration of 25%, and 3g of distilled water were sequentially added to the three-necked flask equipped with a stirrer, sealed, and quickly stirred and uniformly mixed in a water bath at room temperature; The ethyl ester was quickly added to the three-necked flask; then 30g of ethanol solution dissolved with 0.6g of oleic acid and 1.0g of fatty acid diethanolamide was added dropwise to the three-necked flask at a constant speed for 1h through a dropping funnel in a water bath at room temperature. Stir quickly in the middle to ensure that the reaction system is evenly mixed; after the dropwise addition is completed, the reaction is stirred at room temperature in a water bath for 24 hours. After the reaction is completed, the reaction product is suction filtered to collect the solid product, vacuum-dried at 50 ° C and ground to obtain a nano...

Embodiment 3

[0040] Example 3: Preparation of nano-emulsion oil-displacing agent 3

[0041] 38.2g of absolute ethanol, 3.0g of ammonia water with a mass concentration of 25%, and 2.0g of distilled water were added to the three-necked flask equipped with a stirrer, sealed, and quickly stirred and mixed in a water bath at room temperature. Ethyl orthosilicate was quickly added to the three-necked flask; then 40 g of ethanol solution dissolved with 0.6 g of oleic acid, 1.2 g of fatty acid diethanolamide, and 1.0 of oleamide was poured into the three-necked flask through a dropping funnel at a constant speed in a water bath at room temperature. Add dropwise for 1 hour, and stir rapidly during the dropwise addition to ensure that the reaction system is evenly mixed; after the dropwise addition, the reaction is stirred for 24 hours in a water bath at room temperature. After the reaction is completed, the reaction product is suction filtered to collect the solid product and vacuum-dried at 50 °C. ...

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Abstract

The invention discloses a nano-emulsion oil-displacing agent synthesized by a one-step method. The nano-emulsion oil-displacing agent dispersion is prepared with injected water and pumped into the formation. The nano-emulsion oil-displacing agent is spontaneously enriched at the oil-water interface, and Under the induction of formation shear, the Pickering emulsion is formed by directional adsorption at the oil-water interface. Under the condition of water content in the reservoir, the viscosity of the emulsion is directly proportional to the formation water saturation and inversely proportional to the formation oil saturation, thereby automatically adjusting the oil-water interface. Mobility, stable displacement front, enhanced oil recovery. Nano-emulsification oil displacement agent can also be used in combination with surfactants to enhance oil recovery through the synergy of in-situ emulsification viscosity increase and ultra-low interfacial tension oil washing. The principle of the method is reliable, the raw material is cheap and easy to obtain, the economic benefit is outstanding, and the method has broad industrial application prospects.

Description

technical field [0001] The invention relates to a nano-emulsion oil-displacing agent and a preparation method, and belongs to the technical fields of colloid and interface chemistry, oilfield chemistry and oilfield exploitation. Background technique [0002] In the development of oil reservoirs by water flooding, the viscosity of water and oil varies greatly. The injected water advances along the high permeability layer, and the heterogeneity of the reservoir is further deteriorated. Enhanced recovery is urgent. The polymer flooding mainly based on mobility control and the poly-surface binary flooding formed by adding surfactants to the polymer solution provide important technical support to stabilize oil and maintain production. Polymer flooding and poly-surface binary flooding have become the second largest technologies for enhanced oil recovery (EOR) in the world (Koottungal, L. 2014 Worldwide EOR Survey. Oil Gas J. 2014, 112, 79-91.). At present, the technical difficul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C09K8/60E21B43/22
CPCC09K8/584C09K8/604E21B43/16C09K2208/10
Inventor 刘锐徐莹雪蒲万芬任豪孙琳杜代军罗强
Owner SOUTHWEST PETROLEUM UNIV
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