초록 ▼

The invention relates to a process for mineral oil production by means of Winsor Type III microemulsion flooding, in which an aqueous surfactant formulation comprising at least one ionic surfactant of the general formula R1—O—(CH2C(CH3)HO)m(CH2CH2O)n—XY−M+ is injected through injection boreholes int

The invention relates to a process for mineral oil production by means of Winsor Type III microemulsion flooding, in which an aqueous surfactant formulation comprising at least one ionic surfactant of the general formula R1—O—(CH2C(CH3)HO)m(CH2CH2O)n—XY−M+ is injected through injection boreholes into a mineral oil deposit, and crude oil is withdrawn from the deposit through production boreholes.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 ionic surfactants of the general formula.

대표청구항 ▼

1. An aqueous surfactant formulation for mineral oil production, comprising at least one ionic surfactant of the general formula R1—O—(CH2C(CH3)HO)m(CH2CH2O)n—XY−M+ whereR1 is an unbranched saturated or unsaturated straight-chain aliphatic hydrocarbon radical having 16 to 18 carbon atoms,n is from 0

1. An aqueous surfactant formulation for mineral oil production, comprising at least one ionic surfactant of the general formula R1—O—(CH2C(CH3)HO)m(CH2CH2O)n—XY−M+ whereR1 is an unbranched saturated or unsaturated straight-chain aliphatic hydrocarbon radical having 16 to 18 carbon atoms,n is from 0 to 99,m is from 0 to 99, where the sum of n and m is in the range from 3 to 99,Y− is selected from the group consisting of sulfate groups, sulfonate groups, carboxylate groups and phosphate groups,X is an alkyl or alkylene group having 0 to 10 carbon atoms, andM+ is a cation. 2. The formulation according to claim 1, wherein R1 is an unbranched saturated straight-chain aliphatic hydrocarbon radical having 16 to 18 carbon atoms, Y− is selected from the group consisting of sulfate groups, sulfonate groups and carboxylate groups, in the presence of both alkylene oxides in the surfactant the alkylene oxides are >80% arranged in block form, the propylene oxide block is joined directly to the above-described R1—O, and the sum of n and m is in the range from 5 to 15. 3. The aqueous surfactant formulation according to claim 1, wherein the concentration of all surfactants together is 0.05 to 5% by weight, based on the total amount of the aqueous surfactant formulation. 4. A surfactant of the general formula R1—O—(CH2C(CH3)HO)m(CH2CH2O)n—XY−M+ whereR1 is an unbranched saturated or unsaturated straight-chain aliphatic hydrocarbon radical having 16 to 18 carbon atoms,n is from 0 to 99,m is from 0 to 99, where the sum of n and m is in the range from 3 to 99,Y− is selected from the group consisting of sulfate groups, sulfonate groups, carboxylate groups and phosphate groups,X is an alkyl or alkylene group having 0 to 10 carbon atoms, andM+ is a cation. 5. The surfactant according to claim 4, wherein the sum of n and m is in the range from 5 to 15. 6. The surfactant according to claim 4, wherein m is greater than n. 7. The surfactant according to claim 4, wherein RI is a C16-C18 unbranched saturated alkyl. 8. The surfactant according to claim 4, wherein Y−is sulfate. 9. The surfactant according to claim 4, wherein X has 0 carbon atoms. 10. The surfactant according to claim 4, wherein M+is sodium. 11. The surfactant according to claim 4, wherein R1 is a C16-C18 unbranched saturated alkyl,Y− is sulfate,X is an alkyl or alkylene group having 0 carbon atoms, andM+ is sodium. 12. The surfactant according to claim 4, wherein n is from 0 to 19 and m is from 3 to 20. 13. The surfactant according to claim 11, wherein n is from 0 to 19 and m is from 3 to 20. 14. The formulation according to claim 1, wherein R1 is a C16-C18 unbranched saturated alkyl. 15. The formulation according to claim 1, wherein Y− is sulfate. 16. The formulation according to claim 1, wherein X has 0 carbon atoms. 17. The formulation according to claim 1, wherein M+ is sodium. 18. The formulation according to claim 1, wherein R1 is a C16-C18 unbranched saturated alkyl,Y− is sulfate,X is an alkyl or alkylene group having 0 carbon atoms, andM+ is sodium. 19. The formulation according to claim 1, wherein n is from 0 to 19 and m is from 3 to 20. 20. The formulation according to claim 18, wherein n is from 0 to 19 and m is from 3 to 20.