Based on fundamental well test theory, the formula of dimensionless bottom hole pressure drop was derived. With the information of shallow reservoir in Jidong Oilfield, the numerical concept model of well groups was established. The dimensionless pressure drop plate under seven different permeability ranges and ten permeability difference coefficients were calculated and analyzed. The theoretical analysis and numerical concept model calculation results show that the dimensionless pressure drop can eliminate the effects of injection water volume, thick of water absorption lay, formation pressure on the bottom hole pressure drop. Under the studied reservoir conditions, the preferred water flow channels form when the permeability difference coefficient is greater than 6.%根据试井基本理论,推导无因次井底压降表达公式,以冀东南堡陆地中浅层油藏资料为基础,建立典型井组数值概念模型,计算分析7个渗透率范围10种渗透率差异倍数下的无因次压降图版.理论分析和数值概念模型计算均表明:采用无因次压降可以消除注水量、吸水地层厚度、地层压力等参数对井底压降特征的影响；在研究区块油藏条件下,当渗透率差异超过6倍后,可形成优势流动通道.
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