Capsule design for the capture of reagents

Patent metadata

Field	Value
Publication number	US-10723933-B2
Application number	US-201916691103-A
Country	US
Kind code	B2
Filing date	Nov 21, 2019
Priority date	Jan 2, 2018
Publication date	Jul 28, 2020
Grant date	Jul 28, 2020

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 gas control additive for providing gas migration control in a wellbore, the gas control additive comprising:
a semi-permeable membrane comprising a polymer, the semi-permeable membrane forming a shell with a core, such that the core contains a scrubbing agent, the semi-permeable membrane operable to allow an antagonistic gas to permeate through the membrane into the core; and
the scrubbing agent, the scrubbing agent operable to react with the antagonistic gas that permeates into the core to produce a helper byproduct,
where the polymer comprises subunits derived from a first monomer including a di-functional amino group and subunits derived from a second monomer including a tri-functional acid chloride,
where the scrubbing agent is selected from the group consisting of: iron (III) oxide, calcium hydroxide, and combinations of the same.

2. A gas control additive for providing gas migration control in a wellbore, the gas control additive comprising:
a semi-permeable membrane comprising a polymer, the semi-permeable membrane forming a shell with a core, such that the core contains a scrubbing agent, the semi-permeable membrane operable to allow an antagonistic gas to permeate through the membrane into the core; and
the scrubbing agent, the scrubbing agent operable to react with the antagonistic gas that permeates into the core to produce a helper byproduct,
where the polymer comprises subunits derived from a first monomer including a di-functional amino group and subunits derived from a second monomer including a tri-functional acid chloride,
where the antagonistic gas is selected from the group consisting of: hydrogen sulfide, mercaptans, carbon dioxide, natural gases, and combinations of the same.

3. A gas control additive for providing gas migration control in a wellbore, the gas control additive comprising:
a semi-permeable membrane comprising a polymer, the semi-permeable membrane forming a shell with a core, such that the core contains a scrubbing agent, the semi-permeable membrane operable to allow an antagonistic gas to permeate through the membrane into the core; and
the scrubbing agent, the scrubbing agent operable to react with the antagonistic gas that permeates into the core to produce a helper byproduct,
where the polymer comprises subunits derived from a first monomer including a di-functional amino group and subunits derived from a second monomer including a tri-functional acid chloride,
where the helper byproduct is selected from the group consisting of: water, calcium carbonate, calcium bicarbonate, and combinations of the same.

Assignees

• Saudi Arabian Oil Co

Inventors

• Contreras Elizabeth Q

Classifications

• C04B20/0232

  with carbon dioxide · CPC title

• C04B28/02 Primary

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B40/0046

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

• C04B16/0641

  Polyvinylalcohols; Polyvinylacetates · CPC title

• C04B20/1037

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