Zwitterionic surfactants suitable for enhanced oil recovery
AssigneeRhodia Operations
InventorsOlivier BACK, Philippe MARION, Mikel MORVAN
Life of this patent
Estimating the term…
Abstract
The instant invention relates to surfactants having the following formula (I) wherein: each of Ra and Rb is a a linear or branched, saturated or unsaturated, hydrocarbon chain, each of Rc and Rd is a alkyl chain having 1 to 10 carbon atoms, each of (E1) and (E2) is a divalent hydrocarbon radical, A is: a group a carboxylate group —COO− (optionally in all or part in the form —COOH); or a sulfonate group —SO3− (optionally in all or part in the form —SO3H). The invention also relate to the preparation of these surfactants and their use in oil extraction, especially in EOR applications.
Claims20
A surfactant having the formula (I):
- wherein:
- each of Ra and Rb, which are identical or different, is a linear or branched, saturated or unsaturated, hydrocarbon chain that may be interrupted and/or substituted by at least a monocyclic or polycyclic group,
- each of Rc and Rd, which are identical or different, is a linear or branched, alkyl chain having 1 to 10 carbon atoms,
- each of (E1) and (E2) is a divalent hydrocarbon radical linear or branched, not substituted or substituted, optionally carrying a —OH group,
- A is:
- a carboxylate group —COO−, optionally in all or part in its protonated form —COOH;
- or
- a sulfonate group —SO3−, optionally in all or part in its protonated form —SO3H.
(canceled)
Dependencies are inferred from the claim text.