Pucheng oilfield is in the development stage of extremly high water-cut

with the production decline rate of 27.36%.The main factors influencing development effect are:(1)a lot of commingled water injection and producing well; (2)severe damage of well network; (3)weak study of basic geology; and (4)the insufficient quantitative examination of remaining oil. Based on the forecast of production exponential decline model

oil production will be decreased to 800 thousand tons and water content will be increase to 96% in 2006

if the present development scheme is still used. In dealing with these probleums

the following measures have been proposed:(1)reconstruction of flooding pattern; (2)detailed division of flow unit and study of remaining oil distribution; (3)transition from zonal injection-commingled production into zonal injection and production; and (4)evaluation of the reserve difficult to produce.