OIL RECOVERY USING STEAM-CHEMICAL DRIVE FLUIDS

摘要

An improved method for recovering hydrocarbons from underground formations which contain both hydrocarbons and a polyvalent salt formation water comprises injecting into said formation a steam composition containing a basic salt and a sequestering agent, the steam condensate of said steam composition having a pH of at least 8, said steam composition capable of forming an emulsion mobility front and a steam drive.