Abstract: This paper summarizes the development characteristics of Wangchang oilficld and similar ficlds in the U. S. A and Russia. compates and analyzes their levcl of development. and discusses the problems of timing for water flood and EOR. as wel as prcduction uinder enlarging pr essure differentials. It js suggested that the development level of Wangchang oilfield approaches or surpasses that of similar fields in the U.S. A and Russia; for unsaturated sandstone oilfields. it is inappropriate to be produced under excessively enlatging pressure differentials ;and secondary and teriary recovery processes should be started at the time when IeServoir pressure is s0 depleted that peak production and steady production can not be maintained.

Key words: Wangchang oilfield, Development characteristics, Peak production and steady production, Water flooding, Enlarged pressure differential