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.