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根据注水井试井公式，演化、推导出注水井压力指数ＰＩ（Ｐｒｅｓｓｕｒｅｉｎｄｅｘ）计算公式，并进行了室内岩心试验．室内试验结果证实，ＰＩ值与流量成正比；与渗透率具有双曲线关系；与注入截面面积反相关．这些规律与推导出的注水井ＰＩ值公式所表示的变量间关系一致．此外，室内试验还证实了平行管岩心复合ＰＩ值同其中高渗透率岩心的ＰＩ值接近；平行管中两个岩心的ＰＩ值、渗透率，随着调剖次数的增加各自向同一的ＰＩ值、渗透率值靠拢；调剖后随注水量的增加，岩心ＰＩ值先升高，后降低．该项技术已用于广利油田莱３８等区块．
According to the well test formula and evolution of water injection well, pressure inlet formula PI (Pressureindex) was deduced and indoor core test was carried out. The results of laboratory tests confirm that the PI value is proportional to the flow rate and has a hyperbolic relationship with permeability and is inversely related to the injection cross-sectional area. These rules are consistent with the deduced variables for the wellbore PI equation. In addition, the indoor test also confirmed that the PI value of the parallel pipe core is close to the PI value of the high permeability core. The PI and permeability of the two cores in the parallel pipe increase toward the same PI value , Permeability value close; profile with the increase of water injection, core PI value first increased, then decreased. The technology has been used in Guangli Oilfield Levin 38 blocks.