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US 11,299,666 B2Granted
Surfactant composition for the reinjection of produced water
AssigneesTotal SA, Central National De La Recherche Scientifique
InventorsBertrand Levache, Aurélie Le Beulze, Nicolas Passade-Boupat
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Abstract
The invention relates to the use of a non-ionic surfactant and an anionic surfactant for enhancing the injectivity of an injection well, wherein the non-ionic surfactant and the anionic surfactant are added to produced water, to form a reinjection stream which is injected into a subterranean formation by the injection well.
Claims16
A method for enhancing the injectivity of an injection well, comprising:
- adding a non-ionic surfactant and an anionic surfactant to water produced from the well, to form a reinjection stream;
- injecting the reinjection stream into a subterranean formation via the injection well such that the injectivity of the injection well is enhanced;
- wherein the anionic surfactant is of the formula R2—Y, wherein R2 is a saturated or unsaturated aliphatic or aromatic group having from 10 to 18 carbon atoms, a mean degree of unsaturation from 0 to 3, and a mean degree of branching of from 0 to 5;
- and
- wherein —Y is —O—(CH2CH(R3)O)m—(CH2CH2O)n—SO3−M+, wherein:
- R3 is an aliphatic or aromatic group having from 1 to 10 carbon atoms,
- m is from 1 to 20,
- n is from 0 to 5, and
- M+ is a monovalent cation.
6 more elements
A method of extracting hydrocarbons from a subterranean formation, comprising:
- collecting a production stream comprising hydrocarbons and produced water from at least one hydrocarbon production well;
- separating the production stream into at least one or more hydrocarbon streams as well as a stream of produced water;
- continuously adding a non-ionic surfactant and an anionic surfactant to at least part of the stream of produced water to provide a reinjection stream;
- continuously injecting said reinjection stream into the subterranean formation by at least one injection well
- wherein the anionic surfactant is of formula R2—Y, wherein R2 is a saturated or unsaturated aliphatic or aromatic group having from 10 to 18 carbon atoms, a mean degree of unsaturation from 0 to 3, and a mean degree of branching of from 0 to 5;
- and
- wherein —Y is —O—(CH2CH(R3)O)m—(CH2CH2O)n—SO3−M+, wherein:
- R3 is an aliphatic or aromatic group having from 1 to 10 carbon atoms,
- m is from 1 to 20,
- n is from 0 to 5, and
- M+ is a monovalent cation.
8 more elements
Dependencies are inferred from the claim text.