Abstract: Based on fracturing fluid withdrawal data in Xiaoguai oilfield, i ts characteristics were summerized, and Cl^- —Q_p curve prepared for predicting oil/water layer.Furthermore, the parameters of fracturing fluid withdrawal were presented to identify formation deliverability, permeability, fracture conductivity and post-fracturing formation damage and to quali titively evaluate fracturing effect and determine the reason of low production of oil well.All these offer basis for drawing up next development project.

Key words: Karamay oilfield, Fracturing liquid, Discharge fluid, Evaluation, Permeability, Fracture conductivity, Effect