According to the data from Tieshanpo Gasfield and the requirement of reinjection formation, we analyzed and screened some reinjection formations in the field, and then chose Feixianguan Formation as the produced-water reinjection formation.

Technology and development of fine treatment of low permeable oilfield reinjection water;

Based on the characteristics of wastewater quality of a combined station in the low permeability reservoirs of Shengli Oilfield and the quality criteria of reinjection water,the dissolved air flotation(DAF)/three-stage filtration(rough filtration,fine filtration,ultrafiltration) process were used to treat the wastewater.