单相流及具有溶解气影响的油井不稳定IPR理论曲线

以不稳定渗流力学为基础，研究了单相流及具有溶解气影响的油井不稳定IPR曲线的计算方法，即给出了不稳定IPR曲线及定流压条件下的油井产量q与生产时间t的关系，并可求出相同生产时间下产量与流压的关系。当流压低于他和压力有溶解气析出时，对均质无限大地层用Vogel法进行校正，从而得出不同时间下的产量与流压关系。用大庆外围2口探井实际资料对比认为，理论产量与实际产量吻合程度很好。该方法是评价低渗透油井产能的有效方法之一，也可用于不同模型、不同内外边界条件的油井进行产能评价及预测，特别是可用于预测压后产能。

Single Phase Flow and Non-steady IPR Theoretical Curve for Oil Wells with Effect of Solution Gas

On the basis of filtration mechanics,this paper studies single phase flow and calculation procedure of non-steady IPR theoretical curve for oil wells with effect of solution gas,it generates the correlation of oil well output q vs production time t under the condition of non - steady IPR curve and constant flowing presanre, and the relationship between production rate and flowing pressure in the same period of production time may then be obtained,when flowing pressure is lower than bubble point pressure and some solution gas starts to separate out,the homogeneous infinite system is corrected with vogel method to get the relationship of production rate against flowing pressure in different time intervals. The comparison made with actual data from two outlying exploration wells of Daqing oilfield indicates that,theoretical output and actual output matches perfectly. This method is one of the effective measures to evaluate low permeability oil well productivity,it is also applicable to productivity evaluation and prediction of oil wells with different models and inner and outer boundry conditions,and especially suitable for prediction of post fracturing productivity.