Nano emulsified oil displacement agent and preparation method thereof

An oil-displacing agent, nano-technology, applied in the field of nano-emulsion oil-displacing agent and its preparation, can solve the problems such as cumbersome preparation process, achieve the effects of simple synthesis process, enhanced oil recovery, and wide application range

Active Publication Date: 2021-01-12
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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  • Nano emulsified oil displacement agent and preparation method thereof
  • Nano emulsified oil displacement agent and preparation method thereof
  • Nano emulsified oil displacement agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: the preparation of nanoemulsion oil displacement agent 1

[0037] Add 30g of absolute ethanol, 4g of ammonia water with a mass concentration of 25%, and 4g of distilled water in sequence in a three-necked bottle equipped with an agitator, seal it, and stir and mix it evenly in a water bath environment at room temperature; Ethyl ester is quickly added in the three-necked bottle; then in the water bath condition at room temperature, the 44g ethanol solution that is dissolved with 0.8g oleic acid, 2.6g cocamide polyoxyethylene ether is added dropwise at a constant speed in the three-necked bottle for 1h through the dropping funnel, Stir quickly during the dropwise addition to ensure that the reaction system is evenly mixed; after the dropwise addition, stir and react in a water bath at room temperature for 24 hours. After the reaction, filter the reaction product with suction, collect the solid product, dry it in vacuum at 50°C and grind it to obtain nanoemulsio...

Embodiment 2

[0038] Embodiment 2: the preparation of nanoemulsion oil displacement agent 2

[0039] Add 50g of absolute ethanol, 2.4g of ammonia water with a mass concentration of 25%, and 3g of distilled water in sequence in a three-necked bottle equipped with a stirrer, seal it, stir and mix it evenly in a water bath environment at room temperature; Ethyl ester was quickly added to the three-necked bottle; then, in a water bath at room temperature, 30 g of ethanol solution dissolved with 0.6 g of oleic acid and 1.0 g of fatty acid diethanolamide was added dropwise to the three-necked bottle at a constant speed for 1 hour through the dropping funnel, and the dropping process Stir quickly in medium to ensure that the reaction system is evenly mixed; after the dropwise addition, stir and react in a water bath at room temperature for 24 hours. After the reaction, filter the reaction product with suction, collect the solid product, dry it in vacuum at 50°C and grind it to obtain a nano-emulsio...

Embodiment 3

[0040] Embodiment 3: the preparation of nanoemulsion oil displacement agent 3

[0041] Add 38.2g absolute ethanol, 3.0g mass concentration of 25% ammonia, 2.0g distilled water successively in a three-necked bottle equipped with a stirrer, seal, stir and mix evenly in a water bath environment at room temperature; Ethyl orthosilicate was quickly added to the three-necked flask; then, in a water bath at room temperature, 40 g of ethanol solution dissolved with 0.6 g of oleic acid, 1.2 g of fatty acid diethanolamide, and 1.0 oleamide was poured into the three-necked flask at a constant rate through the dropping funnel. Add dropwise for 1 hour, stir quickly during the dropwise addition to ensure that the reaction system is evenly mixed; after the dropwise addition, stir and react in a water bath at room temperature for 24 hours, after the reaction, filter the reaction product with suction, collect the solid product, and dry it in vacuum at 50°C Grinding to obtain nano-emulsion oil ...

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Abstract

The present invention discloses a method comprises the following steps: synthesizing a nano-emulsion oil-displacing agent through a one-step method, preparing a nano-emulsion oil-displacing agent dispersion liquid by using injected water, pumping the nano-emulsion oil-displacing agent dispersion liquid into a stratum, enabling the nano-emulsion oil-displacing agent to be spontaneously enriched onan oil-water interface, and performing directional adsorption on the oil-water interface under the induction of stratum shearing to form Pickering emulsion, and under the condition of reservoirs withwater, the emulsion viscosity is in direct proportion to the stratum water saturation and is in inverse proportion to the stratum oil saturation, so that the oil-water interface fluidity is automatically adjusted, the displacement leading edge is stabilized, and the crude oil recovery rate is increased. The nano-emulsion oil-displacing agent can also be compounded with a surfactant for use, and the crude oil recovery ratio is increased through the cooperation of in-situ emulsification tackifying and ultralow interfacial tension oil washing. The method has the advantages of reliable principle,cheap and easily available raw materials, outstanding economic benefit and wide industrial application prospect.

Description

technical field [0001] The invention relates to a nano-emulsion oil displacement 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 water flooding reservoirs, there is a large difference in the viscosity of water and oil, and the injected water advances along the high permeability layer, and the heterogeneity of the reservoir further deteriorates. It is very urgent to enhance oil recovery. The polymer flooding based on fluidity control and the polymer-surfactant binary flooding formed by adding surfactants to the polymer solution provide important technical support for stabilizing oil production. Polymer flooding and polymer-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, polymer-based chemical ...

Claims

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Application Information

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Patent Type & Authority Applications(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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