Study On The Adaptability Of Air Foam Flooding In Ganguyi Oil Field

Ganguyi is a special low porosity and low permeability oil field with strong heterogeneity,low viscosity crude oil, low pressure system and temperature system. Currently it has water injection difficulties and high water problem in the process of development. To this end, research for tertiary oil recovery technology is very important in this area.Air foam-flooding combine air drive with the foam flooding, foam is used for the profile control, the air used to drive oil.It can both improve the sweep efficiency and enhance oil recovery, synthesized the advantages of foam flooding and the air drive. This thesis has studied the adaptability of foam system, the security of air foam-flooding and the effect of displacement, according to the reservoir characteristics of chang6 in Ganguyi oil field.Composite foam stabilizing agent has a good stabilizing effect not only in injected water but also in formation water. After adding a foaming agent, the corrosion rate has decreased to some extent, and the foam system has a good compatibility with the injected water, formation water and crude oil. When the gas-liquid ratio of is 1:1 to 2:1, the plugging of foam is the strongest. Increased pressure can enhance the stability of foam, with a corresponding ability to enhance the foam block. The plugging of foam increases with the permeability.Associated gas reservoir in the safety of the oxygen content is 11.42% in studied area. The air out from the production of oxygen can be reduced well below 10%, thus eliminating the security risks in producing wells. Air foam displacement has good results.On the basis of the theories and experimental results,air-foam flooding is a safe, effective, and promising technique for enhanced oil recovery in Ganguyi oil field.