区块整体调剖的压力指数决策技术

DECISION TECHNIQUE FOR PRESSURE INDEX ON PROFILE CONTROL IN AN ENTIRE TRACT

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．

Pressure Index (PI) formula discussed in this paper is derived from water injection well test formulae. The formula shows that PI value is opposite change to formation permeability, thickness, formation coefficient and mobility. It is direct proportion to injection rate per day. Core tests were done to verify the PI formula and find the change laws of PI value. Test conclusion testifies that the change of PI value is directly proportional to flow rate, hyperbolic relationship between PI value and permeability, opposite to the injection section area value. Combined PI value of two cores in parallel pipe is near to that of more permeable core. This technique has been applied to Lai 38 tract of Guangli oilfield. A good effect has been obtained.