特低渗油藏压裂井产能预测方法研究

The Research on the Productivity Prediction for Fracturing Wells in Ultra-low Permeability Reservoirs

针对特低渗透油藏垂直裂缝井的产能预测问题,基于椭圆型流动物理模型,考虑启动压力,引入渗透率变异系数和黏度变异系数,导出油井产能预测理论公式。用S油田23口油井的实际生产测试资料进行验算,结果表明,理论公式的计算值与实际值相对误差达-78.7%。基于实测数据将渗透率变异系数修正为地层变异系数,新的油井产能预测公式预测相对误差降至-0.9%。

In consideration to the problems of oil productivity prediction for vertical fracturing wells in ultra- low permeability reservoirs,based on elliptical flow physical model,a theoretical equation was derived by introducing permeability variation coefficient and viscosity variation coefficient in consideration of starting pressure gradient.The results of computation based on oilfield data from 23 wells in S Oilfield indicate that the mean relative error between predicted value and measured value is about -78.7%.Based on the actual measuring data,the permeability variation coefficient is modified into formation variation coefficient.The calculation results show that the mean relative error between predicted value and measured value is reduced to -0.9%.