Secondary recovery of petroleum

摘要: A method is proposed to alleviate the problem of premature breakthrough that occurs in injection type secondary recovery processes. Many petroleum producing reservoirs have layers varying degrees permeability which offer a wide range resistance flow. In typical system fluids will flow through high easier and result low production from if no preventive action taken. This adverse affect can be prevented by injecting viscous fluid into reservoir provide uniform profile. Selectively zones may provided packers. The formed situ, consists liquid containing bubbles gas (foam) liberated solution reduction pressure formations. are water or oil type. Stability foam produced increased adding emulsifying agents types used for oil-in-water emulsions.