Abstract:

After polymer flooding，the distribution of the remaining oil is even more scattered .The description of the remaining oil is more difficult.The fine geologic model is built with polymer flooding pilot test

in Gudao Oilfield.By means of reservoir numerical simulation，the distribution regularity and the affecting factors of the remaining oil after the polymer flooding are researched，the macroscopic distribution pattern of the remaining oil is

proposed based on the contributing factor and the morphological classification，the remaining oil saturation and the relative reserves are quantitatively described.It is pointed out that the top of the thick pay zones and the detention area of pressure balance are the main abundance zones，the coefficient of reservoir variation，the formation crude oil viscosity，the interbed distribution and the amount of the polymer injected are the main factors affecting the flooding effectiveness.The deformed well network pattern exploitation and horizontal and vertical combination well pattern exploitation are simulated，the technological thought improving water flooding effectiveness after polymer flooding is presented.Case study indicates the result is valuable to guide future remaining oil description and production.

Key words: numerical simulation, polymer flooding, remaining oil, quantitative description, well network pattern