Capsule design for the capture of reagents

Patent metadata

Field	Value
Publication number	US-10519359-B2
Application number	US-201816230246-A
Country	US
Kind code	B2
Filing date	Dec 21, 2018
Priority date	Jan 2, 2018
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

A method of using a gas control additive to provide gas migration control in a wellbore includes the steps of mixing the gas control additive with a cement to form a cement slurry, where the gas control additive includes a semi-permeable membrane and a scrubbing agent, such that the semi-permeable membrane forms a shell around a core such that the scrubbing agent is in the core, introducing the cement slurry to the wellbore, and reacting the scrubbing agent with an antagonistic gas to produce a helper byproduct, where the antagonistic gas migrates from a hydrocarbon-bearing formation into the wellbore and permeates through the semi-permeable membrane to the core of the gas control additive.

First claim

What is claimed is:

1. A method of using a gas control additive to provide gas migration control in a wellbore, the method comprising the steps of:
mixing the gas control additive with a cement to form a cement slurry, where the gas control additive comprises a semi-permeable membrane and a scrubbing agent, such that the semi-permeable membrane forms a shell around a core such that the scrubbing agent is in the core;
introducing the cement slurry into the wellbore; and
reacting the scrubbing agent with an antagonistic gas to produce a helper byproduct, where the antagonistic gas migrates from a hydrocarbon-bearing formation into the wellbore and permeates through the semi-permeable membrane to the core of the gas control additive,
where the scrubbing agent is selected from the group consisting of: iron (III) oxide, calcium hydroxide, and combinations of the same.

2. A method of using a gas control additive to provide gas migration control in a wellbore, the method comprising the steps of:
mixing the gas control additive with a cement to form a cement slurry, where the gas control additive comprises a semi-permeable membrane and a scrubbing agent, such that the semi-permeable membrane forms a shell around a core such that the scrubbing agent is in the core;
introducing the cement slurry into the wellbore; and
reacting the scrubbing agent with an antagonistic gas to produce a helper byproduct, where the antagonistic gas migrates from a hydrocarbon-bearing formation into the wellbore and permeates through the semi-permeable membrane to the core of the gas control additive,
where the helper byproduct is selected from the group consisting of: water, calcium carbonate, and combinations of the same.

3. A method of using a gas control additive to provide gas migration control in a wellbore, the method comprising the steps of:
mixing the gas control additive with a cement to form a cement slurry, where the gas control additive comprises a semi-permeable membrane and a scrubbing agent, such that the semi-permeable membrane forms a shell around a core such that the scrubbing agent is in the core;
introducing the cement slurry into the wellbore; and
reacting the scrubbing agent with an antagonistic gas to produce a helper byproduct, where the antagonistic gas migrates from a hydrocarbon-bearing formation into the wellbore and permeates through the semi-permeable membrane to the core of the gas control additive,
where the helper byproduct permeates through the semi-permeable membrane from the core.

4. A method of using a gas control additive to provide gas migration control in a wellbore, the method comprising the steps of:
mixing the gas control additive with a cement to form a cement slurry, where the gas control additive comprises a semi-permeable membrane and a scrubbing agent, such that the semi-permeable membrane forms a shell around a core such that the scrubbing agent is in the core;
introducing the cement slurry into the wellbore; and
reacting the scrubbing agent with an antagonistic gas to produce a helper byproduct, where the antagonistic gas migrates from a hydrocarbon-bearing formation into the wellbore and permeates through the semi-permeable membrane to the core of the gas control additive,
where in the reacting step, a solid product is produced, where the semi-permeable membrane prevents the solid product from permeating through the semi-permeable membrane from the core of the gas control additive.

Assignees

• Saudi Arabian Oil Co

Inventors

• Contreras Elizabeth Q

Classifications

• C09K8/493

  Additives for reducing or preventing gas migration · CPC title

• C04B2103/0068

  Ingredients with a function or property not provided for elsewhere in C04B2103/00 · CPC title

• C04B20/1037

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

• C04B28/02 Primary

  containing hydraulic cements other than calcium sulfates · CPC title

• C09K2208/20

  Hydrogen sulfide elimination · CPC title