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US 2025/0019586 A1Published application
Surfactant mixtures for enhanced oil recovery
AssigneeSaudi Arabian Oil Company
InventorsLimin Xu, Ming Han, Tianping Huang
Life of this patent
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Abstract
A system and a method for making and using an enhanced oil recovery (EOR) fluid. The EOR fluid includes a base fluid, an anionic-nonionic surfactant including one of sodium alkylphenol ethoxylate carboxylate (APEC), sodium alkyl ethoxylate carboxylate (AEC), sodium alkylphenol ethoxylate sulfate (APES), or sodium alkyl ethoxylate sulfate (AES), and a second surfactant including a cationic surfactant including an alkyl pyridine salt.
Claims24
A method for enhanced oil recovery, comprising:
- preparing the EOR fluid of claim 16 by:
- adding the first surfactant to the base fluid;
- and
- adding the second surfactant to the base fluid forming the EOR fluid;
- injecting the EOR fluid into a reservoir through an injection well;
- pushing fluid to a production well;
- and
- producing fluid from the production well, wherein the produced fluid comprises hydrocarbons.
5 more elements
(canceled)
An enhanced oil recovery (EOR) fluid, comprising:
- a base fluid comprising a brine;
- a first surfactant comprising an anionic-nonionic surfactant selected from the group consisting of sodium alkylphenol ethoxylate carboxylate (APEC), sodium alkyl ethoxylate carboxylate (AEC), sodium alkylphenol ethoxylate sulfate (APES), and sodium alkyl ethoxylate sulfate (AES);
- and
- a second surfactant comprising a cationic surfactant comprising an alkyl pyridine salt, wherein the EOR fluid has a temperature between about 25° C. and about 90° C.
1 more element
Dependencies are inferred from the claim text.