Abstract:

The upper oil reserves of Sha 3 member in Wen 33 block of Zhongyuan Oilfields is a deep buried,high geotemperature,high presseure and low permeable pool.For about 10 years,it has been difficult to inject and recovery.To deal with this situation,a precursor test of upward waterflood interval by interval was made associated with the technologies of subdividing measures,shortening well spaces,improving water quality and adjust the whole exploration project of the oil pool.After the test,the effect of pressure break is evident,waterflooding is much better than before and productive capacity is increased by 158%,oil recovery rates is increased 10 time as that before and recovery ratio increased 8.7%.This method has essentially solved the problem between plane and interval and the difficulty of water driving of the reserves,increased recovery ratio.

Key words: deep stratum with low permeability, water flood,oil layer reformation,densifying well network, subdivided sequences, exploitation effect