新型IPR曲线及最小井底流压确定  

Determination of New IPR Curve and Minimum Flowing Bottom-hole Pressure

作　　者：梁忠庆[1] 刘义坤[1] 王晓丛[1] 董英春[1] 

机构地区：[1]大庆石油学院石油工程学院,黑龙江大庆163318

出　　处：《吐哈油气》2010年第1期33-36,共4页Tuha Oil & Gas

摘　　要：在注水保持压力开发油田中,当井底流压低于饱和压力以后,指示曲线向压力轴偏转,并出现最大产量点,表明原有的经典IPR方程已不适用。利用k_m/(μ_oB_o)与压力的函数关系式建立了饱和油藏和未饱和油藏流入动态方程及其通式,然后将油相拟稳态流动方程与油相和液相相对流动能力方程相结合,建立了描述具有最大产量点的流入动态曲线的新型流入动态方程。这种新型的IPR方程可用于不同流动压力下油井流入动态计算,从理论上解释了矿场系统试井中流入动态曲线向压力轴偏转并出现最大产量点等实际问题,满足矿场工程精度要求,说明所建立的流入动态方程能有效评价预测油井产能和确定油井允许的最小流压界限。During the development of oilfield through pressure maintenance by water injection, when the flowing bottom -hole pressure is below the saturation -pressure, the inflow performance curve is deflected toward pressure axis and the maximum production point occurs on the curve. It shows the old inflow performance relationship （IPR） is no longer valid. Based on the functional relationship between kro/（μoBo） and pressure, inflow dynamic equation and its common use equation of saturated and unsaturated pool were established. Combining pseudo - stable flow equation of oil phase with relative flow behavior equation of oil and liquid phases can establish a new inflow performance equation that can describe the IPR curve with maximum flow rate point. The new IPR equation ean be used in the dynamic calculation of oil well inflow under different flow pressure, and theoretically explain the deflection and the maximum oil production point, and can meet the demand of field engineering accuracy, it shows that the established inflow dynamic equation can effectively evaluate and predict oil well＇s productivity and determine the minimum allowable flowing pressure boundary of oil wells.

关 键 词：IPR 饱和油藏 未饱和油藏 饱和压力 地层压力 最小流压 

分 类 号：TE355.5[石油与天然气工程—油气田开发工程]