Robust alkyl ether sulfate mixture for enhanced oil recovery

US11390794B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Christian Bittner · Bensheim, DE
• Ashok Kumar Mishra · Singapore, SG
• Kathrin Cohen · Ludwigshafen am Rhein, DE
• Clara Maria Hernandez Morales · Ludwigshafen am Rhein, DE
• Prapas Lohateeraparp · Houston, US
• Hans-Christian Raths · Monheim, DE
• Michael Bueschel · Ludwigshafen am Rhein, DE
• Gabriela Alvarez Juergenson · Ludwigshafen am Rhein, DE
• Thomas Altmann · Burghausen, DE
• Benjamin Wenzke · Hamburg, DE

Key dates

• Filing date: Sep 19, 2018
• Grant date: Jul 19, 2022
• Expiry date: Sep 26, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K8/584
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for mineral oil production, in which an aqueous saline surfactant formulation comprising a surfactant mixture of at least one anionic surfactant of the general formula R1—O—(CH2C(CH3)HO)x—(CH2CH2O)y—SO3M and at least one anionic surfactant of the general formula R2—O—(CH2CH2O)z—SO3M and a base is injected through injection boreholes into a mineral oil deposit, and crude oil is withdrawn from the deposit through production boreholes. The invention further relates to the surfactant mixture, a concentrate comprising the surfactant mixture and a manufacturing process as well as the use of the surfactant mixture and the con- centrate in the production of mineral oil from underground mineral oil deposits.