After entering in middle to high water cut stage, Shanshan oilfield confronted with great challenges in development, due to the continuous decrease of formation pressure, low water-flooding producing reserves, and high production declination of existent wells.

Numerical simulation by stages about the reservoir at high water cut period.;

The distribution of residual hydrocarbon in high water cut period is characterized by high scatter in space,the advanced grid technology and fine reservoir numerical simulation are the most scientific and applicable technologic methods.

A method of water injection profile control is combined with water shut off in prooduction well for the oilfield in high water cut period.

Oil layer classification for LaSaXing oilfields at high water cut stage;

Logging interpretation of watered-out zone in high water cut stage in low permeability reservoir;

Evaluation method of water saturation around water injection wells in high water cut stage and its application;

Producing-formation characteristics of fluvial-delta reservoir in high water-cut stage;

Current situation of remaining oil distribution in high water-cut stage;

Analysis of effect on integrated administration for increasing and stabilizing oil production in high water-cut stage in Bamianhe Oilfield;

The Jing 11 block in Bieguzhuang Oilfield has entered the high water-cut period,the production decline is quick and the reservoir heterogeneity is serious.

After a low permeability and narrow sand-body oilfield enters high water-cut period, it will face with many problems, such as high water-cut, larger production decline and reserves-production disequilibrium, and so on.

Controlling water cut and stabilizing oil production are inevitable measures for improv-ing the developmental effect of waterflooded oil field during high water-cut period.