Cyanamide-based carbon dioxide and/or hydrogen sulfide scavengers and methods of use in subterranean operations
AssigneeHalliburton Energy Services, Inc.
InventorsRajender Salla, Neelam Deepak Raysoni, Sushant Dattaram Wadekar, Vijaya Kumar Patnana
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Abstract
CO2 scavenging additives having one or more cyanamide functionalities for the reduction of corrosion in subterranean formations are disclosed. The additives are also suitable for the simultaneous scavenging of CO2 and H25. The additives can be introduced by way of a treatment fluid for the subterranean formation to interact with and reduce the concentration of CO2 and/or H25 in the formation.
Claims20
A method comprising:
- providing a treatment fluid comprising a base liquid and a scavenging additive comprising a cyanamide;
- introducing the treatment fluid into at least a portion of a subterranean formation where carbon dioxide is present;
- and
- allowing at least a portion of the treatment fluid to interact with at least a portion of the carbon dioxide to reduce the amount of the carbon dioxide present in the subterranean formation.
A method of treating a subterranean formation comprising carbon dioxide and hydrogen sulfide, the method comprising:
- providing a treatment fluid comprising a base liquid and a scavenging additive comprising a cyanamide;
- introducing the treatment fluid into at least a portion of the subterranean formation;
- and
- allowing at least a portion of the additive to react with at least a portion of the carbon dioxide and at least a portion of the hydrogen sulfide in the fluid to reduce the amount of carbon dioxide and the amount of hydrogen sulfide present in the formation.
A method of treating a cement sheath for a wellbore to prevent corrosion of the sheath, the method comprising:
- contacting at least a portion of the inner surface of the cement sheath with a treatment fluid comprising a base liquid and a carbon dioxide scavenging additive comprising a cyanamide.
Dependencies are inferred from the claim text.