Composition of encapsulated chemical additives and methods for preparation of the same

Patent metadata

Field	Value
Publication number	US-10988662-B2
Application number	US-202017003671-A
Country	US
Kind code	B2
Filing date	Aug 26, 2020
Priority date	Jan 2, 2018
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

Embodiments provide a method of encapsulating a solid cement additive. The method includes the step of applying a base film-forming monomer to the solid cement additive. The method includes the step of forming a coating layer surrounding the solid cement additive. The coating layer includes the base film-forming monomer. The method includes the step of applying an overlay film-forming monomer to the coating layer surrounding the solid cement additive. The method includes the step of reacting the base film-forming monomer and the overlay film-forming monomer to produce a polymer shell. The solid cement additive includes solid particles useful in cementing applications. The polymer shell includes a crosslinked polymer. The polymer shell surrounds the solid cement additive. The polymer shell has a permeability to water allowing controlled release of the solid cement additive.

First claim

That claimed is:

1. A method of using an encapsulated additive in a cementing application, the method comprising the steps of:
mixing the encapsulated additive with a cement slurry to produce an additive slurry, where the cement slurry comprises a cement and a mix water, where the encapsulated additive is formed by the steps of:
applying a base film-forming monomer to a solid cement additive;
forming a coating layer surrounding the solid cement additive, the coating layer comprising the base film-forming monomer;
applying an overlay film-forming monomer to the coating layer surrounding the solid cement additive; and
reacting the base film-forming monomer and the overlay film-forming monomer to produce a polymer shell,
where the polymer shell comprises a crosslinked polymer, the crosslinked polymer comprising aramides,
where the polymer shell surrounds the solid cement additive, and
where the polymer shell has a permeability to water allowing controlled release of the solid cement additive;

placing the additive slurry in a formation; and
releasing the solid cement additive from the surrounding polymer shell.

2. The method of claim 1 , where the cement is selected from the group consisting of a Portland cement, an aluminate cement, a Sorel cement, a phosphate cement, a pozzalonic cement, a slag cement, a geopolymer cement, and combinations of the same.

3. The method of claim 1 , where the mix water is selected from the group consisting fresh water, sea water, a brine, and brackish water.

4. The method of claim 1 , where the crosslinked polymer further includes polyamides.

5. The method of claim 1 , where the solid cement additive is selected from the group consisting of set accelerators, anti-gas migration additives, viscosifying agents, fluid loss control agents, cement dispersants, retarders, salts, polymers, and combinations of the same.

6. The method of claim 1 , where the base film-forming monomer comprises a hydrophobic monomer and the overlay film-forming monomer comprises a hydrophilic monomer.

7. The method of claim 6 , where the hydrophobic monomer is selected from the group consisting of carboxylic acid chlorides, carboxylic acid anhydrides, and combinations of the same.

8. The method of claim 6 , where the hydrophilic monomer is selected from the group consisting of para-phenylenediamine, meta-phenylenediamine, ethylenediamine, hexamethylenediamine, polyethyleneimines, polyetheramines, and combinations of the same.

9. The method of claim 1 , where the base film-forming monomer comprises a hydrophilic monomer and the overlay film-forming monomer comprises a hydrophobic monomer.

10. The method of claim 9 , where the hydrophilic monomer is selected from the group consisting of para-phenylenediamine, meta-phenylenediamine, ethylenediamine, hexamethylenediamine, polyethyleneimines, polyetheramines, and combinations of the same.

11. The method of claim 9 , where the hydrophobic monomer is selected from the group consisting of carboxylic acid chlorides, carboxylic acid anhydrides, and combinations of the same.

Assignees

• Saudi Arabian Oil Co

Inventors

• Contreras Elizabeth Q
• Reddy B Raghava

Classifications

• C04B20/1037

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

• C09K8/487

  Fluid loss control additives; Additives for reducing or preventing circulation loss · CPC title

• C04B40/0046

  characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures · CPC title

• C09K8/467 Primary

  containing additives for specific purposes · CPC title

• C04B2103/408

  Dispersants · CPC title