Polymer-monodispersed nano-microspheres for deep profile control and flooding, and preparation method thereof

Patent metadata

Field	Value
Publication number	US-11225597-B2
Application number	US-201916764559-A
Country	US
Kind code	B2
Filing date	Jul 3, 2019
Priority date	Jun 14, 2019
Publication date	Jan 18, 2022
Grant date	Jan 18, 2022

Abstract

Polymer-monodispersed nano-microspheres for deep profile control and flooding. The polymer-monodispersed nano-microspheres comprise (% wt.): 0.05 to 2.5% of macromolecules A, 0.05 to 2.5% of macromolecules B, 0.002 to 0.05% of an oxygen scavenger, and mineralized water. Macromolecules A comprise a straight-chain water-soluble polymer with an ethyl ether or propyl ether structure. Macromolecules B comprise a water-soluble polymer with a hydroxyl or polyphenolic structure. Macromolecules A and macromolecules B are intermolecularly assembled under the drive of extremely strong hydrogen bonds in aqueous solutions to rapidly construct monodispersed nano-microsphere dispersion glue with a controllable size. The monodispersed nano-microspheres have a good seepage in a porous medium and excellent deep profile control and flooding capabilities.

First claim

The invention claimed is:

1. Polymer-monodispersed nano-microspheres for deep profile control and flooding, comprising, in percentage by weight:

macromolecules A
0.05-2.5%;

macromolecules B
0.05-2.5%;

an oxygen scavenger
0.002-0.05%;

and further comprising a balance of mineralized water, wherein
macromolecules A are of a straight-chain water-soluble polymer with an ethyl ether or propyl ether structure; and
macromolecules B are of a water-soluble polymer with a hydroxyl or polyphenolic structure.

2. The polymer-monodispersed nano-microspheres for deep profile control and flooding according to claim 1 , wherein the macromolecules A are polypropylene glycol, fatty alcohol polyoxyethylene ether, methallyl alcohol polyoxyethylene ether or allyl alcohol polyoxyethylene ether.

3. The polymer-monodispersed nano-microspheres for deep profile control and flooding according to claim 1 , wherein the macromolecules B are carboxymethyl-β-cyclodextrin, tannin extract or tea polyphenol.

4. The polymer-monodispersed nano-microspheres for deep profile control and flooding according to claim 1 , wherein the oxygen scavenger is thiourea.

5. A preparation method for the polymer-monodispersed nano-microspheres for deep profile control and flooding according to claim 1 , sequentially comprising the following steps:
adding a certain amount of the oxygen scavenger to the mineralized water and stirring to dissolve for 10˜20 minutes to produce a mineralized water mixture, and then dividing the mineralized water mixture into two parts;
adding a certain mass concentration of the macromolecules A to a first part of the mineralized water mixture, and stirring to dissolve at room temperature for 10˜30 minutes to produce a macromolecules A solution;
adding a certain mass concentration of the macromolecules B to a second part of the mineralized water mixture, and stirring to dissolve at room temperature for 10˜30 minutes to produce a macromolecules B solution; and
mixing the macromolecules A solution and the macromolecules B solution, and constructing two types of water-soluble polymers under the drive of hydrogen bonds to obtain the polymer monodispersed nano-microspheres.

6. A preparation method for the polymer-monodispersed nano-microspheres for deep profile control and flooding according to claim 2 , sequentially comprising the following steps:
adding a certain amount of the oxygen scavenger to the mineralized water and stirring to dissolve for 10˜20 minutes to produce a mineralized water mixture, and then dividing the mineralized water mixture into two parts;
adding a certain mass concentration of the macromolecules A to a first part of the mineralized water mixture, and stirring to dissolve at room temperature for 10˜30 minutes to produce a macromolecules A solution;
adding a certain mass concentration of the macromolecules B to a second part of the mineralized water mixture, and stirring to dissolve at room temperature for 10˜30 minutes to produce a macromolecules B solution; and
mixing the macromolecules A solution and the macromolecules B solution, and constructing two types of water-soluble polymers under the drive of hydrogen bonds to obtain the polymer monodispersed nano-microspheres.

7. A preparation method for the polymer-monodispersed nano-microspheres for deep profile control and flooding according to claim 3 , sequentially comprising the following steps:
adding a certain amount of the oxygen scavenger to the mineralized water and stirring to dissolve for 10˜20 minutes to produce a mineralized water mixture, and then dividing the mineralized water mixture into two parts;
adding a certain mass concentration of the macromolecules A to a first part of the mineralized water mixture, and stirring to dissolve at room temperature for 10˜30 minutes to produce a macromolecules A solution;
adding a certain mass concentration of the macromolecules B to a second part of the mineralized water mixture, and stirring to dissolve at room temperature for 10˜30 minutes to produce a macromolecules B solution; and
mixing the macromolecules A solution and the macromolecules B solution, and constructing two types of water-soluble polymers under the drive of hydrogen bonds to obtain the polymer monodispersed nano-microspheres.

8. A preparation method for the polymer-monodispersed nano-microspheres for deep profile control and flooding according to claim 4 , sequentially comprising the following steps:
adding a certain amount of the oxygen scavenger to the mineralized water and stirring to dissolve for 10˜20 minutes to produce a mineralized water mixture, and then dividing the mineralized water mixture into two parts;
adding a certain mass concentration of the macromolecules A to a first part of the mineralized water mixture, and stirring to dissolve at room temperature for 10˜30 minutes to produce a macromolecules A solution;
adding a certain mass concentration of the macromolecules B to a second part of the mineralized water mixture, and stirring to dissolve at room temperature for 10˜30 minutes to produce a macromolecules B solution; and
mixing the macromolecules A solution and the macromolecules B solution, and constructing two types of water-soluble polymers under the drive of hydrogen bonds to obtain the polymer monodispersed nano-microspheres.

Assignees

• Univ Southwest Petroleum

Inventors

• Liu Rui
• Pu Wanfen

Classifications

• C09K2208/10

  Nanoparticle-containing well treatment fluids · CPC title

• C09K8/5086

  obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• C09K8/516 Primary

  characterised by their form or by the form of their components, e.g. encapsulated material · CPC title

• C09K8/508

  macromolecular compounds {(C09K8/512 takes precedence)} · CPC title

• C09K8/588 Primary

  characterised by the use of specific polymers {(polymeric surfactants C09K8/584)} · CPC title