Methods for paraffin removal and extended post-primary oil recovery

A method for enhancing oil production from an oil well having paraffin deposits therein, the method comprising:

• (1) removing the paraffin deposits by applying one or more solvents selected from isoamyl acetate, primary amyl acetate, d-limonene, dipentene, turpentine, and/or isopropyl alcohol;
• one or more surfactants;
• one or more yeast fermentation products comprising broth resulting from cultivation of Starmerella bombicola, Wickerhamomyces anomalus or Meyerozyma guilliermondii, wherein the broth does not comprise living yeast cells;
• one or more chelating agents selected from EDTA, citric acid, sodium citrate, and a mixture thereof;
• and, optionally, one or more ammonium salts and/or co-surfactants;
• to the oil well;
• and, immediately thereafter,
• (2) mixing EDTA, an acidic sophorolipid biosurfactant, sodium bicarbonate and water in the presence of a basic pH adjuster to form a basic composition;
• injecting the basic composition into the well either immediately prior to or immediately after injecting an acid solution into the well, wherein the basic composition and the acid react to cause a release of carbon dioxide gas inside the well;
• injecting brine or water into the well;
• and, immediately thereafter,
• (3) injecting a plugging composition into the well.