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A kind of green targeted microcapsule and its preparation system, preparation method and application

A microcapsule and targeting technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of limited effect of enhanced oil recovery, low dispersion, large adsorption loss, etc., and achieve convenient storage and transportation , good mechanical stability and strong salt resistance

Active Publication Date: 2022-04-05
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing polymer oil displacement agents also have the problem of large adsorption loss, and their salt resistance and temperature resistance are facing great challenges, which cannot meet the increasing application requirements.
Therefore, although surfactant / polymer binary compound flooding system, alkali / surfactant / polymer triple compound flooding system and foam profile control flooding system have all been obtained as the most representative chemical flooding systems However, its popularization and application has always been greatly restricted, which seriously limits the development and application of EOR technology.
Microspheres / microcapsules technology that entraps surfactants and releases them after transporting them deep into the reservoir has shown application potential, but the existing systems cannot achieve targeted release of oil displacement agents, and in the formation In addition, the existing microspheres / microcapsules cannot achieve formation permeability selectivity, and their plugging profile control ability and oil washing performance are often difficult to balance. Therefore, the effect of improving oil recovery Restricted, the application is restricted

Method used

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  • A kind of green targeted microcapsule and its preparation system, preparation method and application
  • A kind of green targeted microcapsule and its preparation system, preparation method and application
  • A kind of green targeted microcapsule and its preparation system, preparation method and application

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preparation example Construction

[0061] In a preferred embodiment of the present invention, based on the needs of the preparation method, the preparation system of the green targeted microcapsules also includes an organic solvent and a dispersion stabilizer, such as the preparation process including the following raw materials in parts by weight:

[0062]

[0063] In this preparation system, the organic solvent is used for the dissolution and co-dispersion of the surfactant and the capsule material components, as long as its function is realized; in a preferred embodiment, the organic solvent is a recyclable organic solvent with a low boiling point; more For a specific implementation example, the organic solvent is selected as one or a combination of acetone or methylene chloride.

[0064] For the capsule material component in the specific implementation example-ethyl cellulose, surfactant span 20 and oleic acid, in order to better prepare the microcapsule system, the present invention preferably uses the o...

Embodiment 1

[0090] A green targeted microcapsule preparation system for packaging surfactants, the preparation process includes the following raw materials by weight:

[0091] 10 parts of organic solvent;

[0092] 1 part of surfactant;

[0093] 2 capsules;

[0094] 12 parts of dispersion stabilizer.

[0095] Wherein, the organic solvent is 10 parts of dichloromethane, the surfactant is 1 part of Span20, the capsule material is 2 parts of ethyl cellulose, and the dispersion stabilizer is 12 parts of sodium alginate.

[0096] The preparation method of the green targeting microcapsule of above-mentioned packing surfactant, comprises steps as follows:

[0097] (1) Co-dispersion of surfactant and capsule material: Dissolve 1 part of Span20 and 2 parts of ethyl cellulose in 10 parts of dichloromethane, and keep stirring at room temperature for 30 minutes to obtain 13 parts of mixed oil phase solution;

[0098] (2) Preparation of dispersion stabilizer aqueous solution: add 12 parts of sodium...

Embodiment 2

[0102] The preparation of microcapsule flooding systems with different sizes, the preparation process includes the following raw materials in parts by weight:

[0103]

[0104] Wherein, the organic solvent is 10 parts of dichloromethane, the surfactant is 1 part of Span20, the capsule material is 2 parts of ethyl cellulose, and the dispersion stabilizer is 12 parts of sodium alginate.

[0105] The preparation method of the green targeted microcapsule oil displacement system of the above-mentioned packaging oil displacement agent comprises the following steps:

[0106] (1) Co-dispersion of surfactant and capsule material: Dissolve 1 part of Span20 and 2 parts of ethyl cellulose in 10 parts of dichloromethane, and keep stirring at room temperature for 30 minutes to obtain 13 parts of mixed oil phase solution;

[0107] (2) Preparation of dispersion stabilizer aqueous solution: add 12 parts of sodium alginate to 1200 parts of deionized water, and stir at 25°C for 120 minutes to...

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Abstract

The invention discloses a green targeted microcapsule and its preparation system, preparation method and application. The oil displacement system includes surfactant and capsule material. The high-efficiency surfactant is encapsulated in micro- and nano-sized microcapsules, which are dispersed in the water phase and dissolved in the oil phase. The size distribution of the microcapsules is regulated according to the formation permeability. The large-sized microcapsules migrate in the large pores in the high-permeability zone to play a role in profile control and plugging. The small-sized microcapsules can enter the small-pore reservoir and migrate to the The low-permeability zone with high residual oil saturation releases surfactants after contacting crude oil and exerts a targeted effect. The problem of adsorption loss on the surface of the layer medium can be solved, and the oil recovery rate can be improved.

Description

technical field [0001] The invention belongs to the technical field of oil field chemicals, and relates to a green microcapsule and system with permeability selectivity and oil phase targeting function, its preparation method and application, and specifically discloses a green target for packaging surfactants. The microcapsule intelligent high-efficiency oil displacement system and its preparation system and method, as well as its application in enhanced oil recovery and enhanced oil recovery. Background technique [0002] The information in the background technology section of the present invention is only intended to increase the understanding of the general technical background of the invention, and is not necessarily regarded as acknowledging or implying in any form that the information constitutes the prior art known to those skilled in the art. [0003] Oil is an important strategic resource and the economic lifeline of a country's development, and its effective exploi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/516C09K8/584
CPCC09K8/516C09K8/584
Inventor 李英于浩然
Owner SHANDONG UNIV