Claims
- 1. In a method of recovering crude oil from a subterranean formation by a waterflooding process, the improvement wherein the waterflood is preceded by injection into said formation of a slug of a transparent, aqueous solution of a water-soluble, sulfated, polyethoxylated alcohol, said aqueous solution being substantially free of any other thickening agent and any other surface active agent.
- 2. The method of claim 1 wherein said sulfated, polyethoxylated alcohol is a sulfated, polyethoxylated C.sub.10-18 primary alcohol or alkylphenol.
- 3. The method of claim 2 wherein said sulfated, polyethoxylated alcohol is a sulfated, polyethoxylated C.sub.12-15 primary alcohol.
- 4. A method of recovering crude oil from a subterranean formation having at least one injection means in fluid communication with at least one production means which comprises:
- injecting into said formation through said injection means a slug of a transparent, aqueous solution of a water-soluble, sulfated, polyethoxylated alcohol, said aqueous solution being substantially free of any other thickening agent and any other surface active agent;
- subsequently injecting into said formation through said injection means a waterflood; and
- recovering crude oil through said production means.
- 5. The method of claim 4 wherein said sulfated, polyethoxylated alcohol is a sulfated, polyethoxylated C.sub.10-18 primary alcohol or alkylphenol.
- 6. The method of claim 5 wherein said sulfated, polyethoxylated alcohol is a sulfated, polyethoxylated C.sub.12-15 primary alcohol.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a division of copending application Ser. No. 430,330, filed Jan. 2, 1974.
US Referenced Citations (5)
Divisions (1)
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Number |
Date |
Country |
Parent |
430330 |
Jan 1974 |
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