| The most civil main oilfields have stepped high water content period after water flood development whose recovery ratio could access to the highest from 30% to 40% and 2/3 geologic reserves are on the subsurface, including the dead oils that water flood can't swept and the flooded irreducible oils. Gas injection is a technology, which could effectively enhance the oil recovery, and recent years it gets more and more popular which has a wide range of application. Therefore, gas injection technology has an extensive developmental foreground.In view of 11-4 oilfield of Weizhou, gas injection numerical simulation researches is developed which has a referred influence on other fields'gas injections.11-4 oilfield has been in production tail, on which stimulation ratio is not very high to take such measures as pump changing, east field exploitation, high water content wells sidetrack drilling etc. Thus, geological model of this territorial field must be built by applying oil field data and taking use of the geological model simulation on the data of 11-4 oilfield. Also, phases on oil-gas researches and gas injection swelling experiments are conducted. After that, the data from these experiments are simulated and then compositional model is built. Above all, many numerical simulation schemes on gas injection immiscible region are researched, according to which 11-4 oilfield features inverted layered and thus gas injection should take low speed and pill ways, by which recovery ratio on 11-4 oilfield could enhanced to some degree. Meanwhile, the feasibility of improved hydrocarbon recovery by foam injection is studied initially, by which it can be concluded that foam injection could effectively enhance field recovery ratio by choosing suitable surface-acting agents.
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