Compositions and methods for carbon dioxide solidification
AssigneeChevron U.S.A. Inc.
InventorsSriram Chandrasekhar, Taimur Malik, Behdad Aminzadeh Goharrizi, Sujeewa S. Palayangoda
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Abstract
Compositions and methods that can be used to sequester carbon dioxide within a subterranean formation are described. The methods can include contacting carbon dioxide present in the subterranean formation with a complexing agent, resulting in precipitation of a carbonate or bicarbonate salt of the complexing agent within the subterranean formation.
Claims16
A method for sequestering carbon dioxide within a subterranean formation, the method comprising:
- contacting carbon dioxide present in the subterranean formation with an iminoguanidine complexing agent, resulting in precipitation of a carbonate or bicarbonate salt of the iminoguanidine complexing agent within the subterranean formation,
- wherein the subterranean formation has a temperature below 90° C.;
- and
- wherein the iminoguanidine complexing agent is defined by Formula I-1 or Formula I-2:
- wherein
- A is a ring-containing moiety or a bond, and
- one or more of the hydrogen atoms in Formula I-1 or Formula I-2 may be replaced with one or more-equivalent number of methyl groups.
A method of influencing migration of a gas or fluid within a subterranean formation, the method comprising:
- injecting an aqueous composition comprising an iminoguanidine complexing agent into the subterranean formation via a wellbore in fluid communication with the subterranean formation;
- displacing the iminoguanidine complexing agent to a desired location within the subterranean formation;
- and
- contacting the iminoguanidine complexing agent with carbon dioxide, resulting in precipitation of a carbonate or bicarbonate salt of the iminoguanidine complexing agent at the desired location within the subterranean formation,
- wherein the iminoguanidine complexing agent is defined by Formula I-1 or Formula I-2:
- wherein
- A is a ring-containing moiety or a bond, and
- one or more of the hydrogen atoms in Formula I-1 or Formula I-2 may be replaced with one or more equivalent number of methyl groups;
- and
- wherein the subterranean formation has a temperature below 90° C.
A method of reducing migration of a gas or fluid within a subterranean formation, the method comprising:
- injecting an aqueous composition comprising an iminoguanidine complexing agent into the subterranean formation via a wellbore in fluid communication with the subterranean formation;
- and
- displacing the iminoguanidine complexing agent to a desired location within the subterranean formation to form a barrier to gas or fluid penetration;
- wherein when the iminoguanidine complexing agent contacts carbon dioxide, a precipitate comprising a carbonate or bicarbonate salt of the iminoguanidine complexing agent forms at the desired location within the subterranean formation,
- wherein the iminoguanidine complexing agent is defined by Formula I-1 or Formula I-2:
- wherein
- A is a ring-containing moiety or a bond, and
- one or more of the hydrogen atoms in Formula I-1 or Formula I-2 may be replaced with one or more equivalent number of methyl groups;
- and
- wherein the subterranean formation has a temperature below 90° C.
Dependencies are inferred from the claim text.